CN110139382A - Sending method, method of reseptance and the device of random access preamble - Google Patents

Abstract

This application discloses a kind of sending method of random access preamble, method of reseptance and devices, terminal device is when sending multiple random access preambles, before the sending time of the associated random access preamble of the good downlink signal of signal quality is between the transmission of the associated random access preamble of downlink signal of poor signal quality, terminal device can first receive the decode the good downlink signal of signal quality, then the good associated random access preamble of downlink signal of signal quality is preferentially sent, terminal device turn-on time for can be reduced random access in this way reduces access delay.

Description

Sending method, receiving method and device of random access preamble

technical field

The present application relates to the communication field, and in particular to a random access preamble sending method, receiving method and related devices.

Background technique

Before the random access response is supported in NR (new radio, new air interface), multiple random access preambles are sent. That is, the terminal may send multiple random access preambles within the time interval from when it sends the first random access preamble to when it receives the random access response. If the terminal successfully receives the random access response corresponding to at least one random access preamble among the sent multiple random access responses, it stops sending the random access preamble.

The multiple random access preamble transmission (multiple preamble transmission) in NR is configured by the base station on the terminal, that is, the random access in the non-contention mode allows the terminal to send multiple random access preambles. According to the downlink signal configured by the base station (for example: downlink synchronization signal block SS/PBCH block, Synchronization Signal, PhysicalBroadcast Channel Block or channel state information reference signal CSI-RS, Channel StateInformation ReferenceSignal) and the random access resource or preamble associated with the downlink signal , select at least one downlink signal and an associated random access preamble, and perform random access. Although NR has agreed to support multiple random access preambles (multiple preamble transmission), how to transmit multiple random access preambles is currently under discussion.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a random access preamble sending method, receiving method and related devices, so as to reduce the time delay of random access.

The first aspect of the present application provides a method for sending a random access preamble, including: a terminal device receives one or more downlink signals from a network device, K is an integer greater than 1; the terminal device receives one or more downlink signals according to The signal quality sends M random access preambles; where M≤K and M is an integer greater than 1, the sending time of the random access preamble associated with the downlink signal with good signal quality is less than that of the random access preamble associated with the downlink signal with poor signal quality Before the leading send time.

Wherein, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or more random access preamble; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with a random access preamble. The terminal device selects M random access preambles from the K random access preambles to send, and the terminal device arranges the K random access preambles in descending order according to the signal quality of the downlink signal, and then selects the top M random access preambles Sending, for example: sending on one or more beams, M random access preambles can be sent on one beam or on multiple beams, and each beam only sends one random access preamble; multiple The beam directions of the beams may or may not be the same.

In a possible design, the signal quality of the downlink signal includes RSRP (Reference Signal Receiving Power, reference signal receiving power), RSRQ (Reference Signal Receiving Quality, reference signal receiving quality) and RS-SINR (Reference Signal-Signal to Interference plus NoiseRatio, any one of the reference signal-signal-to-interference-noise ratio).

Wherein, the terminal device may measure the signal quality of the downlink signal, or the terminal device may obtain the signal quality of each downlink signal according to the configuration information sent by the network device.

In a possible design, the signal quality of the M downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In a possible design, the downlink signal includes any one of SS/PBCH block and CSI-RS.

In a possible design, before the terminal device receives one or more downlink signals from the network device, it further includes:

The terminal device receives configuration information from the network device, and the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the number M of the actually sent random access preamble. one or more species.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold. The signal quality threshold may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored or pre-configured by the terminal device.

In a second aspect, the present application provides a method for receiving random access preambles, including: the network device sends one or more downlink signals to the terminal device, wherein the network device receives M random access preambles sent by the terminal device, M The random access preambles belong to the K random access preambles, and the signal quality of the downlink signal associated with the random access preamble received earlier is better than the signal quality of the downlink signal associated with the random access preamble received later.

Wherein, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or more random access preamble; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with a random access preamble.

In a possible design, the downlink signal includes any one of SS/PBCH block and CSI-RS.

In a possible design macro, the signal quality of the downlink signal includes one or more of RSRP, RSRQ, and RS-SINR.

In a possible design, before the network device sends one or more downlink signals to the terminal device, it further includes:

The network device sends configuration information to the terminal device, and the configuration information includes the relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the number M of the actually sent random access preamble. or more. Optionally, the number M of random access preambles actually sent may also be a fixed value pre-stored or pre-configured by the terminal device.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In a third aspect, the present application provides a method for sending a random access preamble, including:

The terminal device receives one or more downlink signals from the network device, one or more downlink signals are associated with K random access preambles, K is an integer greater than 1; the terminal device sends K random access preambles to the network device on M beams M random access preambles in the access preamble; wherein, M≤K and M is an integer greater than 1, and the sending time of the beam with the beam gain is before the sending time of the beam with the low beam gain.

Wherein, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or more random access preamble; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with a random access preamble.

Wherein, the beam directions of the M beams may be different, the beams generate M beams, and each beam is used to send a random access preamble.

In a possible design, the transmit powers of the M beams are incremented with the same boost power according to the transmit sequence.

Wherein, the transmit power of the beam transmitted earlier is smaller than the transmit power of the beam transmitted later, and the boost power represents the increment of the transmit power of the two beams transmitted adjacently.

In a possible design, before the terminal device receives one or more downlink signals from the network device, it further includes:

The terminal device receives configuration information from the network device, the configuration information includes: the association between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the number M of the actually sent random access preamble one or more.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In a fourth aspect, the present application provides a method for receiving a random access preamble, including:

The network device sends one or more downlink signals to the terminal device; the one or more downlink signals are associated with K random access preambles;

The network device receives M random access preambles among the K random access preambles sent by the terminal device on the M beams; wherein, the beam gain of the beam received earlier is higher than the gain of the beam received later.

Wherein, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or more random access preamble; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with a random access preamble.

In a possible design, the downlink signal includes one or more of SS/PBCH block and CSI-RS.

In a possible design, before the network device sends one or more downlink signals to the terminal device, it further includes:

The network device sends configuration information to the terminal device; wherein, the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the number M of the actually sent random access preamble one or more.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In a possible design, the transmit powers of the M beams are incremented with the same boost power according to the transmit sequence.

In a possible design, the sending time of the random access preamble associated with the downlink signal with good signal quality is before the sending time of the random access preamble associated with the downlink signal with poor signal quality.

In a fifth aspect, the present application provides a device for sending a random access preamble, including:

A receiving unit, configured to receive one or more downlink signals from a network device; wherein, the one or more downlink signals are associated with K random access preambles, and K is an integer greater than 1;

A sending unit, configured to send M random access preambles among the K random access preambles to the network device according to the signal quality of the downlink signal; where M≤K and M is an integer greater than 1, the signal quality is good The sending time of the random access preamble associated with the downlink signal is before the sending time of the random access preamble associated with the downlink signal with poor signal quality.

In a possible design, the signal quality of the downlink signal includes one or more of a reference signal received power RSRP, a reference signal received quality RSRQ, and a reference signal signal-to-interference-noise ratio RS-SINR.

In a possible design, the downlink signal includes any one of a synchronization signal/physical broadcast signal block SS/PBCH block and a channel state information reference signal CSI-RS.

In one possible design, it is characterized in that,

The receiving unit is further configured to receive configuration information from the network device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the actual One or more of the number M of sent random access preambles.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

The sixth aspect of the present application provides a device for receiving a random access preamble, including:

A sending unit, configured to send one or more downlink signals to the terminal device; wherein, the one or more downlink signals are associated with K random access preambles, and K is an integer greater than 1;

The receiving unit is configured to receive M random access preambles among the K random access preambles sent by the terminal device according to the signal quality of the downlink signal; wherein, M≤K and M is an integer greater than 1, first receive The received signal quality of the downlink signal associated with the random access preamble is better than the signal quality of the subsequently received downlink signal associated with the random access preamble.

In a possible design, the signal quality of the downlink signal includes one or more of RSRP, RSRQ and RS-SINR.

In a possible design, the downlink signal includes one or more of SS/PBCH block and CSI-RS.

In one possible design, it is characterized in that,

The sending unit is further configured to send configuration information to the terminal device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold and the actual transmission One or more of the number M of random access preambles.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signaling quality threshold.

In a seventh aspect, the present application provides a device for sending a random access preamble, including:

A receiving unit, configured to receive one or more downlink signals from a network device; wherein, one or more downlink signals are associated with K random access preambles, and K is an integer greater than 1;

A sending unit, configured to send M random access preambles among the K random access preambles to the network device on M beams; wherein, M≤K and M is an integer greater than 1, and the beam with a high beam gain The transmission time is before the transmission time of the beam with a low beam gain.

In a possible design, the downlink signal includes any one of SS/PBCH block and CSI-RS.

In one possible design,

The receiving unit is further configured to receive configuration information from the network device; wherein, the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, the signal quality threshold, the actually sent One or more of the number M of random access preambles.

In a possible design, the sending powers of the M beams are incremented with the same boost power according to the sending order.

The eighth aspect of the present application provides a device for receiving a random access preamble, including:

A sending unit, configured to send one or more downlink signals to the terminal device; wherein the one or more downlink signals are associated with K random access preambles;

A receiving unit, configured to receive M random access preambles among the K random access preambles sent by the terminal device on M beams; wherein, the beam gain of the first received beam is higher than that of the later received The beam gain of the beam.

In a possible design, the downlink signal includes one or more of SS/PBCH block and CSI-RS.

In a possible design, the sending unit is configured to send configuration information to the terminal device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, and the format of the random access preamble One or more of , the signal quality threshold and the number M of actually sent random access preambles.

In a possible design, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In a possible design, the sending powers of the M beams are incremented with the same boost power according to the sending order.

Another aspect of the present application provides a device, which includes: a memory and a processor; wherein, a set of program codes are stored in the memory, and the processor is used to call the program codes stored in the memory to execute various method described in the aspect.

Yet another aspect of the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, it causes the computer to execute the methods described in the above aspects.

Yet another aspect of the present application provides a computer program product containing instructions, which, when run on a computer, causes the computer to execute the methods described in the above aspects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the embodiments of the present invention will be described below.

FIG. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present invention;

FIG. 2a is an interactive schematic diagram of a random access preamble transmission method provided by an embodiment of the present invention;

Fig. 2b is a schematic diagram of sending downlink signals provided by an embodiment of the present invention;

FIG. 3 is an interactive schematic diagram of a random access preamble transmission method provided by an embodiment of the present invention;

FIG. 4 is an interactive schematic diagram of a random access preamble transmission method provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a device provided by an embodiment of the present invention;

Fig. 6 is another schematic structural diagram of a device provided by an embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .

The embodiments of the present application can be applied to wireless communication systems. It should be noted that the wireless communication systems mentioned in the embodiments of the present application include but are not limited to: Narrow Band-Internet of Things (NB-IoT), Global Mobile Communication system (Global System for Mobile Communications, GSM), enhanced data rate for GSM Evolution system (Enhanced Data rate for GSM Evolution, EDGE), wideband code division multiple access system (Wideband Code Division Multiple Access, WCDMA), code division multiple access 2000 system (Code Division Multiple Access, CDMA2000), time division synchronous code division multiple access system (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), long term evolution system (Long Term Evolution, LTE), NR (New Radio, new air interface) The communication system and the three major application scenarios of the next-generation 5G mobile communication system are enhanced mobile broadband (Enhanced Mobile Broad Band, eMBB), URLLC, and massive machine-type communications (MassiveMachine-Type Communications, mMTC).

In the embodiment of this application, the terminal device includes but not limited to mobile station (MS, Mobile Station), mobile terminal device (Mobile Terminal), mobile phone (Mobile Telephone), mobile phone (handset) and portable device (portable equipment), etc., the terminal equipment can communicate with one or more core networks via the radio access network (RAN, Radio Access Network), for example, the terminal equipment can be a mobile phone (or called a "cellular" phone), with A computer with a communication function, etc., and the terminal device may also be a portable, pocket-sized, hand-held, built-in computer or vehicle-mounted mobile device or device.

FIG. 1 is a schematic diagram of a communication system architecture provided by the present application.

As shown in FIG. 1 , a communication system 01 includes a network device 101 and a terminal device 102 . When the communication system 01 includes a core network, the network device 101 may also be connected to the core network. The network device 101 can also communicate with an Internet Protocol (Internet Protocol, IP) network 200 , for example, the Internet (internet), a private IP network, or other data networks. Network devices provide services to terminal devices within coverage. For example, referring to FIG. 1 , the network device 101 provides wireless access for one or more terminal devices within the coverage of the network device 101 . In addition, network devices can also communicate with each other.

The network device 101 may be a device for communicating with terminal devices. For example, it may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolved Node B, eNB) in an LTE system. or eNodeB) or network-side devices in future 5G networks. Alternatively, the network device may also be a relay station, an access point, a vehicle-mounted device, and the like. In a device-to-device (Device to Device, D2D) communication system, the network device may also be a terminal device functioning as a base station. Terminal devices may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of user equipment (UE), mobile stations (mobile station, MS) and so on.

Among them, in the NR communication system, the format of the random access preamble is divided into two categories. When the sequence length is 839, there are four formats of the random access preamble, which are format 0 to format 3, as shown in Table 1:

Format of Random Access Preamble sequence length subcarrier spacing 0 839 1.25KHz 1 839 1.25KHz 2 839 1.25KHz 3 839 5KHz

Table 1

When the sequence length is 127 or 139, there are 10 formats for the random access preamble, as shown in Table 2:

Table 2

where u=0, 1, 2 or 3. In addition, the NR communication system also defines the bandwidth allocation of random access resources corresponding to the random access preamble and the number of protected subcarriers, as shown in Table 3:

table 3

Although the NR communication system involved in the embodiment of the present invention supports the sending of multiple random access preambles, how to send the multiple random access preambles is still under discussion.

Please refer to FIG. 2a. FIG. 2a is an interactive schematic diagram of a random access preamble transmission method provided by an embodiment of the present invention. The method includes the following steps:

S201. The network device sends K downlink signals to the terminal device, and the terminal device receives the K downlink signals from the network device.

Specifically, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or Multiple random access preambles; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with one random access preamble. In this embodiment, K downlink signals and K random access preambles are taken as an example, and each downlink signal is associated with one random access preamble for illustration, and the other two association methods will not be described in detail.

The downlink signal is the signal sent by the network device to the terminal device. The downlink signal can be a downlink synchronization signal or a downlink reference signal. The network device sends K downlink signals through beams, and the network device can send K downlink signals on one beam; Or the network device sends K downlink signals on K beams, and each beam sends one downlink signal; or sends K downlink signals on multiple beams, and each beam sends one or more downlink signals. Downlink signals include but are not limited to any one or more of SS/PBCH block, DMRS, and CSI-RS. K is an integer greater than 1, that is, the number of downlink signals sent by the network device can be one or more.

Referring to Figure 2b, the position distribution diagram of the downlink signal sent by the network equipment, the downlink signal is SS/PBCH block, and 8 SS/PBCH blocks form a downlink signal group, and the rectangular box in Figure 2b represents all the available users of the network equipment For the time-frequency resources for sending downlink signals, the gray rectangular box indicates the time-frequency resources occupied by the downlink signals actually sent. It can be seen from the figure that the number of downlink signals actually sent is 16.

Wherein, the SS/PBCH block includes SS (synchronization signal, synchronization signal) and PBCH, and SS includes PSS (primary synchronization signal, primary synchronization signal) and SSS (secondary synchronization signal, secondary synchronization signal). Among them, the SS/PBCH block can also have other names, for example: SS block.

Wherein, the terminal device is pre-configured or pre-stored with the association relationship between the downlink signal and the random access preamble, or the association relationship between the downlink signal and the random access resource, and the random access resource represents the information used to send the random access preamble Time-frequency resources, the terminal device determines K random access preambles associated with the received K downlink signals according to the association relationship. The association relationship can be carried in configuration information, which can be composed of radio resource control RRC signaling, system information SI, remaining system information RMSI, new air interface system information block 1NR SIB1, MAC-CE signaling, downlink control information DCI, physical broadcast At least one of the channels PBCH and PDCCH order is sent.

S202. The terminal device sends M random access preambles among the K random access preambles to the network device according to the signal quality of the downlink signal, and the network device receives the M random access preambles from the terminal device.

Specifically, the terminal device determines the signal quality of each downlink signal among the K downlink signals. Since the network device sends the downlink signal in a beam manner, the signal quality of the downlink signal in this embodiment is the signal quality at the beam level. Wherein, the signal quality of the downlink signal determined by the terminal device can be determined according to at least one of the following parameters: spatial path loss (Path Loss, PL), base station downlink reference signal transmission power, base station transmission signal gain (for example: transmission beamforming gain), Base station receive signal gain (for example: receive beamforming gain), preamble initial receive power, base station transmit signal/receive signal gain difference, terminal downlink signal receive signal gain (for example: receive beamforming gain), terminal uplink random access preamble transmission Signal gain (for example: transmit beamforming gain), terminal random access preamble transmit power, terminal downlink signal receiving beam/uplink random access preamble transmit signal gain difference.

Among them, the spatial path loss can be determined by base station downlink reference signal transmission power, base station transmission signal gain, base station reception signal gain, base station transmission signal/base station reception signal gain difference, terminal downlink signal reception signal gain, terminal uplink random access preamble transmission signal gain , at least one of terminal downlink signal receiving beam/uplink random access preamble signal gain difference and RSRP is determined.

For example: the signal quality of the downlink signal is any one of RSRP, RSRQ and RS-SINR, and the RSRP is determined by the spatial path loss, the base station downlink reference signal transmission power, and the base station transmission signal gain. For example, RSRP=base station downlink reference signal transmission power-spatial path loss. For another example, RSRP=base station downlink reference signal transmit power+base station transmit signal gain−space path loss.

Another example: the signal quality of the downlink signal is RSRP, and RSRP is composed of spatial path loss, terminal downlink signal receiving signal gain, terminal uplink random access preamble transmission signal gain, terminal downlink signal receiving beam/uplink random access preamble transmission signal gain difference. RSRP = base station downlink reference signal transmission power + terminal downlink signal reception beam/uplink random access preamble transmission signal gain difference. It should be noted that, unlike in the LTE communication system, the signal quality in LTE is a cell-level parameter, while the signal quality in this application is a beam-level parameter.

Wherein, after determining the signal quality of each downlink signal according to the above method, the terminal equipment selects M random access preambles from K random access preambles, M≤K and M is an integer greater than 1, and the M random access preambles are located at In the same random access response window, the random access response window indicates the time when the terminal device sends the first random access preamble (for example, the last subframe and/or time slot and/or orthogonal frequency slot where the random access preamble is located). multiplexed OFDM symbols) to the latest possible successful reception of the random access response. The value of M may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored by the terminal device, which is not limited in this embodiment. Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold. The signal quality threshold may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored by the terminal device. This Examples are not limiting.

In a possible implementation manner, the terminal device sends M random access preambles among the K random access preambles to the network device, wherein the sending time of the random access preamble associated with the downlink signal with good signal quality is within the signal quality Before the transmission time of the random access preamble associated with the poor downlink signal.

For example: M=4, the four random access preambles to be sent on the terminal device are: A0, A1, A2, A3, wherein the random access preamble A0 is associated with CSI-RS1, and the random access preamble A1 is associated with CSI-RS2, The random access preamble A2 is associated with CSI-RS3, and the random access preamble A3 is associated with CSI-RS4. If the terminal device receives the above four downlink signals and arranges them in descending order according to the signal quality, for example: CSI-RS2>CSI-RS4>CSI-RS1>CSI-RS3, then the order in which the terminal device sends the random access preamble is as follows: Random access preamble A1, random access preamble A3, random access preamble A0, random access preamble A2.

Wherein, the terminal device sends M random access preambles in a manner of multiple beams. For example: the terminal device can send M random access preambles on one beam; or the terminal device can send M random access preambles on M beams, and each beam sends a random access preamble; or the terminal device can send M random access preambles on multiple beams; M random access preambles are sent on the beam, and one or more random access preambles are sent on each beam. Optionally, when the terminal device uses multiple beams to send M random access preambles, the beam directions of the multiple beams may be the same, that is, the terminal device sends multiple beams sequentially in the same beam direction. Optionally, when the terminal device uses multiple beams to send M random access preambles, the terminal device sends multiple beams according to the same boosted power, where the boosted power represents the increase in the received power of the preamble target between two beams sent adjacently. amount (step size). When determining the transmit power of the random access preamble, the terminal needs to obtain the path loss according to the signal quality of the downlink signal corresponding to the current random access preamble, specifically: transmit power = path loss + preamble target received power, path loss = downlink signal transmission Power - downlink signal quality.

For example: the terminal device uses N beams to send M random access preambles, N=3, and the terminal device generates three beams, respectively, beam 1, beam 2, and beam 3, and the sending order of the three beams is beam 1, beam 3, Beam 2, the receiving power of the leading target of the first beam of the terminal device is P0, and the lifting power is △P, then the transmitting power of beam 1 is P0, the receiving power of the leading target of beam 3 is P0+△P, and the leading target of beam 2 receives The power is P0+2×△P. For another example, when the terminal uses M different beams to send M random access preambles, the same target preamble receiving power is used, that is, the terminal transmits twice adjacently, if switching the sending/receiving beam/associated random access preamble corresponds The downlink signal does not perform power boosting.

In another possible implementation manner, the terminal device sends M random access preambles to the network device, wherein the sending time of the random access preamble associated with the downlink signal with poor signal quality is shorter than that of the random access preamble associated with the downlink signal with good signal quality. Before the transmission time of the access preamble.

For example: M=4, the four random access preambles to be sent on the terminal device are: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, wherein the random access preamble A0 Associated with CSI-RS1, random access preamble A1 is associated with CSI-RS2, random access preamble A2 is associated with CSI-RS3, and random access preamble A3 is associated with CSI-RS4. The terminal device arranges the above four downlink signals in ascending order according to the signal quality, for example: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3, then the order in which the terminal device sends the random access preamble is: random The access preamble A2, the random access preamble A0, the random access preamble A3, and the random access preamble A1.

Wherein, the terminal device sends M random access preambles in a beam manner, and the terminal device can send M random access preambles on one beam; or the terminal device sends M random access preambles on M beams, each The beam sends one random access preamble; or the terminal device sends M random access preambles on multiple beams, and each beam sends one or more random access preambles. Optionally, when the terminal device uses multiple beams to send M random access preambles, the beam directions of the multiple beams may be the same, that is, the terminal device sends multiple beams sequentially in the same beam direction. Optionally, when the terminal device uses multiple beams to send M random access preambles, the terminal device sends multiple beams according to the same preamble target receiving power, and the boost power indicates that the transmit power between two adjacent beams is increased. quantity.

In another possible implementation manner, the terminal device sends the M random access preambles according to the sending sequence indicated by the configuration information of the network device.

The process of the network device receiving the M random access preambles is described below: when the network device receives any random access preamble among the M random access preambles, it responds to the random access preamble. Optionally, when the network device receives any number of random access preambles among the M random access preambles, it responds to one of the random access preambles, for example: responding to the random access preamble with the best signal quality, and for example : Response to the random access preamble received first. Optionally, when the network device knows the random access preamble that may be sent by the terminal device and the corresponding time and frequency position, and the network device receives any random access preamble among the multiple random access preambles, the detection is stopped by Other random access preambles sent by the same terminal device. Optionally, the network device responds to at least one of the random access preambles after receiving all the random access preambles. For example, responding to the random access preamble with the best received signal quality; another example, responding to all random access preambles in the same random access response message; another example, using multiple random access response messages, each random access A plurality of random access preambles are responded to in response to the response message.

On at least one random access opportunity (RACH occasion/RACHtransmission occasion/RACH opportunity/RACH chance, RO) within the random access response window time, if at least one of the multiple random access preambles configured by the network device to the terminal device Located on the random access opportunity, the network device continues to receive and detect the random access preamble; wherein, the random access opportunity indicates time and frequency resources required for sending a random access preamble. In one implementation, the network device may respond to at least one detected random access preamble in a response message. Optionally, the random access response in the response message is set according to the strength of the signal quality corresponding to the detected random access preamble received by the network device. For example: in the response message, the random access response corresponding to the random access preamble received by the network device with strong signal quality (sent by the terminal device) is located before the random access response corresponding to the random access preamble with weak received signal quality. For another example: in the response message, the network device receives a random access response corresponding to a random access preamble with a strong signal quality, and is located after a random access response corresponding to a random access preamble with a weak received signal.

In an implementation manner, in the random access response window, the network device responds to M random access preambles through M response messages, and the terminal device receives the M response messages. Optionally, the time sequence in which the M response messages are sent is placed according to the strength of the signal quality corresponding to the random access preamble received and detected by the network device, and/or the random access response in the response message is arranged according to the strength of the network device Receive and place the strength and weakness of the quality signal corresponding to the detected random access preamble. For example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), the response random access preamble in the response message, and the corresponding received signal quality is sent later in time (corresponding to the terminal device in time The random access preamble of the response in the response message received first above). Another example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), and the response random access preamble in the response message, the corresponding received signal quality is sent later in time (corresponding to the terminal device in The random access preamble of the response in the response message received first in time).

Optionally, in the above implementation manner, the response message further includes the time and/or frequency position of the random access resource where the random access preamble is located.

Optionally, in the above implementation manner, the response message also includes the signal quality of at least one random access preamble received by the network device, for example: the RSRP corresponding to at least one first random access preamble, and/or at least one first random access preamble The RSRP difference between the second random access preamble and the first random access preamble.

In an implementation manner, after receiving the first random access response, the terminal device stops sending other random access preambles.

In an implementation manner, after receiving the pre-stored or pre-configured M random access responses, the terminal device stops receiving other random access responses, and/or stops sending other random access preambles.

In another implementation, the sending method of the random access response is indicated by the configuration information of the network device, and the terminal device receives the random access response according to the indication information, including but not limited to: the number of response messages, the number of random access responses, random At least one of the relationship between the time sequence of access preamble transmission and the transmission beam gain of the terminal equipment, the strength of downlink signal quality, the sequence of random access responses in the response message, and the relationship between the strength of received signal of the random access preamble.

In this application, the downlink signal may refer to a synchronization signal block (synchronization signal block, SSblock), a channel state information reference signal (channel state information reference signal, CSI-RS), a reference signal, downlink data, system information, and downlink antenna ports. one or more.

Implementing the embodiment of the present invention, when the terminal device sends multiple random access preambles, the sending time of the random access preamble associated with the downlink signal with good signal quality is before the sending time of the random access preamble associated with the downlink signal with poor signal quality Before the time, the terminal device can first receive and decode the downlink signal with good signal quality, and then give priority to sending the random access preamble associated with the downlink signal with good signal quality, so that the terminal device can reduce the time of the random access process and reduce the access delay .

Referring to FIG. 3 , it is a schematic flowchart of a random access signal transmission method provided by an embodiment of the present invention. In an embodiment of the present invention, the method includes:

S301. The network device sends K downlink signals to the terminal device, and the terminal device receives the K downlink signals from the network device.

Specifically, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or Multiple random access preambles; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with one random access preamble. In this embodiment, K downlink signals and K random access preambles are taken as an example, and each downlink signal is associated with one random access preamble for illustration, and the other two association methods will not be described in detail.

K is an integer greater than 1. The K random access preambles can be multiple random access preambles pre-stored by the terminal device, or multiple random access preambles configured by the network device. The K random access preambles are located in the same random access preamble. Within the access response window, the random access response window is the time of the first random access preamble sent by the terminal device (for example, the last subframe and/or time slot and/or OFDM using OFDM symbols) to the latest possible successful reception of the random access response. Optionally, the terminal device receives K downlink signals sent by the network device, determines associated K random access preambles according to the K downlink signals, and each downlink signal is associated with one random access preamble; another example: the terminal device receives the network One downlink signal sent by the device, determine the associated K random access preambles according to the downlink signal; another example: the terminal device receives multiple downlink signals sent by the network device, and determines the associated K random access preambles according to the multiple downlink signals Preamble, wherein each downlink signal is associated with one or more random access preambles.

Wherein, in this embodiment, the downlink signal is a signal sent by the network device to the terminal device. The downlink signal may be a downlink reference signal or a downlink synchronization signal. The downlink signal includes but is not limited to any of SS/PBCH block, DMRS, and CSI-RS. A sort of. It should be noted that the SS/PBCH block includes SS (synchronization signal, synchronization signal) and PBCH, and SS includes PSS (primary synchronization signal, primary synchronization signal) and SSS (secondary synchronization signal, secondary synchronization signal). Among them, the SS/PBCH block can also have other names, for example: SS block.

S302. The terminal device selects M random access preambles from the K random access preambles associated with the M downlink signals and sends them to the network device, and the network device receives the M random access preambles from the terminal device.

Specifically, the terminal device selects M random access preambles from K random access preambles, where M≤K and M is an integer greater than or equal to 1. Optionally, the terminal device selects M random access preambles from the K random access preambles according to the configuration information of the base station, for example: the network device sends configuration information to the terminal device, and the configuration information carries the format of the M random access preambles, The configuration information can be obtained by at least one of radio resource control RRC signaling, system information SI, residual system information RMSI, system information block 1 (SIB1), MAC-CE signaling, downlink control information DCI, physical broadcast channel PBCH, and PDCCH order send. Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold. The signal quality threshold may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored by the terminal device. This implementation Examples are not limited.

In a possible implementation manner, the terminal device generates M beams, and each beam is used to send a random access preamble. The beam directions of the M beams may be different from each other. When the terminal device sends M beams, the beam The transmission timing of the beam with high gain is before the transmission timing of the beam with low beam gain. Optionally, the terminal device transmits the M beams with the same boosted power, and the boosted power is an increment between target preamble received powers of two beams sent adjacently. Optionally, the M random access preambles are associated with the same downlink signal.

For example: the three beams to be sent generated by the terminal device are: beam 1, beam 2, and beam 3. Beam 1 is used to send random access preamble A0, beam 2 is used to send random access preamble A1, and beam 3 is used to send The preamble A2 is randomly accessed, and the relationship between the beam gains of the three beams to be sent is: beam 3>beam 1>beam 2, then the sequence of beams sent by the terminal device is: beam 3, beam 1, and beam 2.

Assuming that the target preamble receiving power of the first beam is P0, and the boost power step size is △P, then the target preamble receiving power of beam 3 is P0, the target preamble receiving power of beam 1 is P0+△P, and the target preamble receiving power of beam 2 is P0 It is P0+2×△P.

In another possible implementation manner, the terminal device generates M beams, and each beam is used to send a random access preamble. The beam directions of the M beams may be different. When the terminal device sends the M beams, The transmission time of the beam with a low beam gain is before the transmission time of a beam with a high beam gain. Optionally, the terminal device uses the same boost power to send M beams.

For example: the three beams to be sent generated by the terminal device are: beam 1, beam 2, and beam 3. Beam 1 is used to send random access preamble A0, beam 2 is used to send random access preamble A1, and beam 3 is used to send The preamble A2 is randomly accessed, and the relationship between the beam gains of the three beams to be sent is: beam 3<beam 1<beam 2, then the order in which the terminal device sends beams is: beam 3, beam 1, and beam 2.

The process of the network device receiving the M random access preambles is described below: when the network device receives any random access preamble among the M random access preambles, it responds to the random access preamble. Optionally, when the network device receives any number of random access preambles among the M random access preambles, it responds to one of the random access preambles, for example: responding to the random access preamble with the best signal quality, and for example : Response to the random access preamble received first. Optionally, when the network device knows the random access preamble that may be sent by the terminal device and the corresponding time and frequency position, and the network device receives any random access preamble among the multiple random access preambles, the detection is stopped by Other random access preambles sent by the same terminal device.

On at least one random access opportunity within the random access response window time, if at least one of the multiple random access preambles configured by the network device to the terminal device is located on the random access opportunity, the network device continues to receive and Detect random access preamble. In one implementation, the network device may respond to at least one detected random access preamble in a response message. Optionally, the random access response in the response message is set according to the strength of the signal quality corresponding to the detected random access preamble received by the network device. For example: in the response message, the random access response corresponding to the random access preamble received by the network device with strong signal quality (sent by the terminal device) is located before the random access response corresponding to the random access preamble with weak received signal quality. For another example: in the response message, the network device receives a random access response corresponding to a random access preamble with a strong signal quality, and is located after a random access response corresponding to a random access preamble with a weak received signal.

In an implementation manner, in the random access response window, the network device responds to the M received random access preambles with M response messages, and the terminal device receives the M response messages. Optionally, the time sequence in which the M response messages are sent is placed according to the strength of the signal quality corresponding to the random access preamble received and detected by the network device, and/or the random access response in the response message is arranged according to the strength of the network device Receive and place the strength and weakness of the quality signal corresponding to the detected random access preamble. For example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), the response random access preamble in the response message, and the corresponding received signal quality is sent later in time (corresponding to the terminal device in time The random access preamble of the response in the response message received first above). Another example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), and the response random access preamble in the response message, the corresponding received signal quality is sent later in time (corresponding to the terminal device in The random access preamble of the response in the response message received first in time).

Optionally, in the above implementation manner, the response message further includes the time and/or frequency position of the random access resource where the random access preamble is located.

Optionally, in the above implementation manner, the response message also includes the signal quality of at least one random access preamble received by the network device, for example: the RSRP corresponding to at least one first random access preamble, and/or at least one first random access preamble The RSRP difference between the second random access preamble and the first random access preamble.

In an implementation manner, after receiving the first random access response, the terminal device stops sending other random access preambles.

In an implementation manner, after receiving the pre-stored or pre-configured M random access responses, the terminal device stops receiving other random access responses, and/or stops sending other random access preambles.

In another implementation, the sending method of the random access response is indicated by the configuration information of the network device, and the terminal device receives the random access response according to the indication information, including but not limited to: the number of response messages, the number of random access responses, random At least one of the relationship between the time sequence of access preamble transmission and the transmission beam gain of the terminal equipment, the strength of downlink signal quality, the sequence of random access responses in the response message, and the relationship between the strength of received signal of the random access preamble.

In this application, the downlink signal may refer to a synchronization signal block (synchronization signal block, SSblock), a channel state information reference signal (channel state information reference signal, CSI-RS), a reference signal, downlink data, system information, and downlink antenna ports. one or more.

Implementing the embodiment of Figure 3, when the terminal device sends multiple random access preambles, the beam with high beam gain is sent before the beam with low beam gain, and the terminal device can receive and decode the random access preamble with high beam gain first, reducing The time of the random access process is reduced to reduce the access delay.

Referring to FIG. 4 , it is a schematic flowchart of a random access preamble transmission method provided by an embodiment of the present invention. In an embodiment of the present invention, the method includes:

S401. The network device sends K downlink signals to the terminal device, and the terminal device receives the K downlink signals from the network device.

Specifically, the association relationship between the downlink signal and the random access preamble may be: one downlink signal is associated with K random access preambles; or multiple downlink signals are associated with K random access preambles, and each downlink signal is associated with one or Multiple random access preambles; or K downlink signals are associated with K random access preambles, and each downlink signal is associated with one random access preamble. In this embodiment, K downlink signals and K random access preambles are taken as an example, and each downlink signal is associated with one random access preamble for illustration, and the other two association methods will not be described in detail.

The downlink signal is the signal sent by the network device to the terminal device. The downlink signal can be a downlink synchronization signal or a downlink reference signal. The network device sends K downlink signals through beams, and the network device can send K downlink signals on one beam; Or the network device sends K downlink signals on K beams, and each beam sends one downlink signal; or the network device sends K downlink signals through multiple beams, and each beam sends one or more downlink signals. The downlink signal includes but is not limited to any one or more of SS/PBCH block, DMRS, and CSI-RS, and K is an integer greater than 1.

It should be noted that the SS/PBCH block includes SS (synchronization signal, synchronization signal) and PBCH, and SS includes PSS (primary synchronization signal, primary synchronization signal) and SSS (secondary synchronization signal, secondary synchronization signal). Among them, the SS/PBCH block can also have other names, for example: SS block.

Wherein, the terminal device is pre-configured or pre-stored with the association relationship between the downlink signal and the random access preamble, or the association relationship between the downlink signal and the random access resource, and the random access resource represents the information used to send the random access preamble Time-frequency resources, the terminal device determines K random access preambles associated with the received K downlink signals according to the association relationship. The association relationship can be carried in the configuration information, and the configuration information can be composed of radio resource control RRC signaling, system information SI, remaining system information RMSI, new system information block 1SIB1, MAC-CE signaling, downlink control information DCI, physical broadcast channel PBCH , PDCCH order to send at least one.

S402. The terminal device sends M random access preambles among the K random access preambles to the network device according to the signal quality and beam gain of the downlink signal, and the network device receives the M random access preambles from the terminal device.

Specifically, the terminal device determines the signal quality of each of the K downlink signals. The signal quality of the downlink signal in this embodiment is the signal quality at the beam level. For the method for the terminal device to determine the signal quality of the downlink signal, refer to S202. description, which will not be repeated here.

Wherein, after determining the signal quality of each downlink signal, the terminal device selects M random access preambles from K random access preambles, M≤K and M is an integer greater than 1, and the M random access preambles are located in the same random access preamble. In the access response window, the random access response window represents the time from the time when the terminal device sends the first random access preamble (represented by a time slot, subframe or OFDM symbol) to the time when the terminal device successfully receives the random access response (when available slots, subframes or OFDM symbols). The value of M may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored by the terminal device, which is not limited in this embodiment. Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold, and the signal quality threshold may be notified by the network device to the terminal device through configuration information, or may be a fixed value pre-stored by the terminal device. In this embodiment No limit. The terminal device generates M beams according to the selected M random access preambles, and the beam directions of the M beams may be different, and the terminal device determines the beam gain of each beam.

In a possible implementation manner, the terminal device sends multiple random access preambles to the network device on M sending beams, and the sending sequence of the multiple random access preambles satisfies: first, the beam with high beam gain is used to send signals with good quality Then use the beam with low beam gain to send the random access preamble associated with the downlink signal with good signal quality, and then use the beam with high beam gain to send the random access preamble associated with the downlink signal with poor signal quality Finally, a beam with a low beam gain is used to transmit a random access preamble associated with a downlink signal with poor signal quality. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on the M beams.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in descending order according to the signal quality, for example: CSI-RS2>CSI-RS4>CSI-RS1>CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The sequence of sending preambles may be: send random access preamble A1 on beam 4, beam 2, beam 3, and beam 1 in sequence, then send random access preamble A3 on beam 4, beam 2, beam 3, and beam 1 in sequence, and then Then the random access preamble A0 is sent on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence, and finally the random access preamble A2 is sent on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence.

Another example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI- RS1, the random access preamble A1 is associated with CSI-RS2, the random access preamble A2 is associated with CSI-RS3, and the random access preamble A3 is associated with CSI-RS4. The terminal device calculates the final transmit power required for the four random access preambles according to the corresponding CSI-RS. For example, the relationship between the final transmit power is: random access preamble A1>random access preamble A3>random access preamble A0> Preamble A2 is randomly accessed. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain: beam 4>beam 2>beam 3>beam 1, then the terminal device sends a random The sequence of access preambles is: send random access preamble A2 on beam 4, beam 2, beam 3 and beam 1 in sequence, and then send random access preamble A0 on beam 4, beam 2, beam 3 and beam 1 in sequence, Then the random access preamble A3 is sequentially sent on the beam 4, the beam 2, the beam 3 and the beam 1, and finally the random access preamble A1 is sent on the beam 4, the beam 2, the beam 3 and the beam 1 in sequence.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on M beams, and the sending sequence of the multiple random access preambles satisfies: first, the beam with the lower beam gain is used to send the signal with better quality Then use the beam with high beam gain to send the random access preamble associated with the downlink signal with good signal quality, and then use the beam with low beam gain to send the random access preamble associated with the downlink signal with poor signal quality Finally, the beam with high beam gain is used to send the random access preamble associated with the downlink signal with poor signal quality. Optionally, the terminal device uses the same target preamble receiving power to send M random access preambles on M beams.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in descending order according to the signal quality, for example: CSI-RS2>CSI-RS4>CSI-RS1>CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The order of sending the preamble can be: send the random access preamble A2 on beam 1, beam 3, beam 2, and beam 4 in sequence, then send the random access preamble A0 on beam 1, beam 3, beam 2, and beam 4 in sequence, and then Then the random access preamble A3 is sent on the beam 1, the beam 3, the beam 2, and the beam 4 in sequence, and finally the random access preamble A1 is sent on the beam 1, the beam 3, the beam 2, and the beam 4 in sequence.

In a possible implementation manner, the terminal device sends multiple random access preambles to the network device on M beams, and the sending sequence of the multiple random access preambles satisfies: first, the beam with high beam gain is used to send the signal with poor signal quality The random access preamble associated with the downlink signal, and then use the beam with low beam gain to send the random access preamble associated with the downlink signal with poor signal quality, and then use the beam with high beam gain to send the random access preamble associated with the downlink signal with good signal quality , and finally use the beam with low beam gain to send the random access preamble associated with the downlink signal with good signal quality. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on the M beams.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in descending order according to the signal quality, for example: CSI-RS2>CSI-RS4>CSI-RS1>CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The order of sending the preamble can be: send the random access preamble A2 on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence, and then send the random access preamble A0 on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence, and then Then the random access preamble A3 is sent on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence, and finally the random access preamble A1 is sent on the beam 4, the beam 2, the beam 3, and the beam 1 in sequence.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on M beams, and the sending order of the multiple random access preambles satisfies: first, the beam with low beam gain is used to send a signal with poor quality Then use the beam with high beam gain to send the random access preamble associated with the downlink signal with poor signal quality, and then use the beam with low beam gain to send the random access preamble associated with the downlink signal with good signal quality Finally, a beam with a high beam gain is used to send a random access preamble associated with a downlink signal with good signal quality. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on the M beams.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in descending order according to the signal quality, for example: CSI-RS2>CSI-RS4>CSI-RS1>CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The order of sending the preamble can be: send the random access preamble A1 on beam 1, beam 3, beam 2, and beam 4 in sequence, then send the random access preamble A0 on beam 1, beam 3, beam 2, and beam 4 in sequence, and then Then the random access preamble A3 is sent on the beam 1, the beam 3, the beam 2, and the beam 4 in sequence, and finally the random access preamble A2 is sent on the beam 1, the beam 3, the beam 2, and the beam 4 in sequence.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on the M beams, and when the terminal device sends multiple random access preambles, it first sends them according to the signal quality of the downlink signal from good to poor , and then transmit according to the beam gain from high to low, that is, first use the beam with high beam gain to transmit the random access preamble associated with the downlink signal with good signal quality, and then use the beam with high beam gain to transmit the random access preamble associated with the downlink signal with poor signal quality The random access preamble is used to transmit the random access preamble associated with the downlink signal with good signal quality using the beam with low beam gain, and finally the random access preamble associated with the downlink signal with poor signal quality is transmitted using the beam with low beam gain. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on the M beams. For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in ascending order according to the signal quality, for example: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The sequence of sending preambles can be: send random access preambles A2, A0, A3, A1 on beam 4 in sequence, then send random access preambles A2, A0, A3, A1 on beam 2 in sequence, and then sequentially on beam 3 Send random access preambles A2, A0, A3, A1, and finally send random access preambles A2, A0, A3, A1 on beam 1 in sequence.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on M beams, and when the terminal device sends multiple random access preambles, it first sends the downlink signal according to the signal quality of the downlink signal from poor to good , and then transmit according to the beam gain from low to high, that is, first use the beam with low beam gain to transmit the random access preamble associated with the downlink signal with poor signal quality, and then use the beam with poor beam gain to transmit the random access preamble associated with the downlink signal with good signal quality The random access preamble is used to transmit the random access preamble associated with the downlink signal with poor signal quality using the beam with high beam gain, and finally the random access preamble associated with the downlink signal with good signal quality is transmitted using the beam with high beam gain. Optionally, the terminal device sends multiple random access preambles on the M beams using the same preamble target receiving power.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in ascending order according to the signal quality, for example: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in ascending order of gain, for example: beam 4<beam 2<beam 3<beam 1, then the terminal device The order of sending the preambles can be as follows: send random access preambles A1, A3, A0, A2 on beam 4 in sequence, then send random access preambles A1, A3, A0, A2 on beam 2 in sequence, and then send random access preambles on beam 3 in sequence Send random access preambles A1, A3, A0, A2, and send random access preambles A1, A3, A0, A2 on beam 1 for the last time.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on the M beams, and when the terminal device sends multiple random access preambles, it first sends them according to the signal quality of the downlink signal from good to poor , and then transmit according to the beam gain from low to high, that is, first use the beam with low beam gain to transmit the random access preamble associated with the downlink signal with good signal quality, and then use the beam with low beam gain to transmit the random access preamble associated with the downlink signal with poor signal quality The random access preamble is used to transmit the random access preamble associated with the downlink signal with good signal quality using the beam with high beam gain, and finally the random access preamble associated with the downlink signal with poor signal quality is transmitted using the beam with high beam gain. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on the M beams.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in ascending order according to the signal quality, for example: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in descending order of gain, for example: beam 4 > beam 2 > beam 3 > beam 1, then the terminal device The order of sending the preambles can be: send random access preambles A2, A0, A3, A1 on beam 1 in sequence, then send random access preambles A2, A0, A3, A1 on beam 3 in sequence, and then sequentially on beam 2 Send random access preambles A2, A0, A3, A1, and finally send random access preambles A2, A0, A3, A1 on beam 4 in sequence.

In another possible implementation manner, the terminal device sends multiple random access preambles to the network device on M beams, and when the terminal device sends multiple random access preambles, it first sends the downlink signal according to the signal quality of the downlink signal from poor to good , and then transmit according to the beam gain from high to low, that is, first use the beam with high beam gain to transmit the random access preamble associated with the downlink signal with poor signal quality, and then use the beam with high beam gain to transmit the random access preamble associated with the downlink signal with good signal quality Random access preamble, then use the beam with low beam gain to transmit the random access preamble associated with the downlink signal with poor signal quality, and finally use the beam with low beam gain to transmit the random access preamble associated with the downlink signal with good signal quality. Optionally, the terminal device sends multiple random access preambles on the M beams using the same preamble target receiving power.

For example: M=4, the random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1 , the random access preamble A1 is associated with the CSI-RS2, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. The terminal device arranges the above four downlink signals in ascending order according to the signal quality, for example: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3. The terminal device generates 4 beams, the 4 beams are beam 1, beam 2, beam 3 and beam 4, and the 4 beams are arranged in ascending order of gain, for example: beam 4<beam 2<beam 3<beam 1, then the terminal device The sequence of sending preambles can be: send random access preambles A1, A3, A0, and A2 on beam 1 in sequence, then send random access preambles A1, A3, A0, and A2 on beam 3 in sequence, and then sequentially on beam 2 Send random access preambles A1, A3, A0, A2, and send random access preambles A1, A3, A0, A2 on beam 4 for the last time.

In a possible implementation manner, the network device configures a sending manner of the random access preamble according to the beam capability of the terminal device and/or the beam capability of the network device. Optionally, the terminal device reports the beam capability to the network device, and the network device determines random access resources scheduled to the terminal or random access configuration information indicated to the terminal according to the beam capability information of the terminal device.

In a possible implementation manner, on the premise that the terminal device has beam consistency, N random access preambles are sent to the network device on M sending beams, and the sending sequence of multiple random access preambles satisfies: M random access preambles The access preamble is associated with N downlink signals. First, the random access preamble associated with the downlink signal is sent using the transmit beam corresponding to the beam receiving the downlink signal with good quality, and then the downlink signal is associated with the beam corresponding to the beam receiving the poor downlink signal. random access preamble. Optionally, the terminal device uses the same target preamble receiving power to send multiple random access preambles on M. Optionally, after receiving the K downlink signals, the terminal device sorts the quality of the K*M signals and sends the random access preamble corresponding to the next signal in descending order; or for each downlink signal, the base station The quality of the received signals of the M receiving beams is sorted, and the received signal quality of the receiving beams is in descending order, and the corresponding sending beam is used to send the random access preamble.

For example: M=4, the terminal device can generate 4 transmit beams {1, 2, 3, 4} and 4 receive beams {1, 2, 3, 4}, where transmit beam i is consistent with receive beam i, i=1,2,3,4. The random access preamble to be sent by the terminal device is: random access preamble A0, random access preamble A1, random access preamble A2 and random access preamble A3, random access preamble A0 is associated with CSI-RS1, random access preamble A1 The CSI-RS2 is associated, the random access preamble A2 is associated with the CSI-RS3, and the random access preamble A3 is associated with the CSI-RS4. For each downlink signal, the terminal device can obtain a signal quality in each beam direction, and can obtain 4×4=16 received downlink signal qualities in total. For example, Q _ij represents the quality of the j-th downlink signal received by the terminal device on the i-th beam, satisfying Q ₁₁ >Q ₁₂ >Q ₁₃ >Q ₁₄ >Q ₂₁ >Q ₂₂ >Q ₂₃ >Q ₂₄ >Q ₃₁ >Q ₃₁ >Q ₃₃ >Q ₃₄ >Q ₄₁ >Q ₄₂ >Q ₄₃ >Q ₄₄ , the random access preamble A1 is first sent on the first transmission beam, and then the random access preamble A1 is sent on the first transmission beam The access preamble A2 is in sequence, and finally the random access preamble A4 is sent on the fourth transmission beam.

Or, for each downlink signal, for example: CSI-RS1, the quality of the signal received by the 4 receiving beams of the terminal device satisfies: beam 1>beam 3>beam 2>beam 4, then the terminal device sequentially transmits beam 1, transmits Random access preamble 1 is sent on beam 3, sending beam 2, and sending beam 4; for the rest of the downlink signals, they are sent according to this rule.

In the present invention, beam consistency means that the terminal device can determine the uplink beam used for transmission according to the measurement of one or more beams; or the network device can instruct the terminal device based on the measurement of one or more uplink beams of the terminal device. The device determines the downlink receiving beam according to the instruction; or the network device determines the uplink receiving beam based on the terminal device's measurement of one or more downlink beams of the network device; or the network device determines the downlink sending beam based on the measurement of one or more receiving beams; or The radio frequency channels of the sending beam and the receiving beam are consistent, and the gain error in the same direction is within k db (decibel), k>0, for example: k=2.

In another implementation, on the premise that the network device does not have beam consistency, the terminal device uses the same transmit beam to send the preamble sequence, so that the network device can realize beam scanning within the time of multiple random access preambles, and obtain the most excellent beam. For example: the network device indicates in the configuration information that the N random access preambles associated with the same downlink signal are located at different time and/or frequency positions, and the terminal device, according to the network device configuration information, receives the downlink signal and obtains the downlink The N associated signals are located at different time and/or frequency positions, and the N random access preambles are sent using the same terminal sending beam. Optionally, the network device may perform beam scanning and/or combination detection during the time of the N random access preambles to obtain an optimal base station receiving beam corresponding to the terminal device and/or better receiving performance.

In the present invention, whether the network device has beam consistency, and/or the number of beams that the network device can use for reception and transmission can be broadcast/transmitted through SS block, RMSI, broadcast system information, RRC, DMRS sequence portability, etc.

For example: the network device has 4 receiving beams, and the terminal is to send 4 random access preambles: A0, A1, A2, and A3, which are respectively associated with downlink signals CSI-RS0, CSI-RS1, CSI-RS2, and CSI-RS3 in turn, where The downlink signal quality satisfies: CSI-RS2<CSI-RS4<CSI-RS1<CSI-RS3, the terminal device generates 4 transmission beams, and the beam gain meets: beam 4<beam 2<beam 3<beam 1, then the terminal device first uses Beam 1 sends random preamble A3, repeating 4 times; then uses beam 3 to send random preamble A1, repeats 4 times; then uses beam 2 to send random preamble A4, repeats 4 times; finally uses beam 2 to send water machine preamble A2, repeats 4 times . The network device receives the random access preamble according to each beam scan, and determines the optimal transmit-receive beam pair.

In one implementation, the network device configures multiple random access preambles to the terminal device for initiating non-contention random access (for example, handover (handover), beam refinement/beam refinement, beam recovery report (beam failure recovery request), system message request, paging message trigger, positioning, etc.). In an implementation manner, the network device configures multiple random access preambles to the terminal device for initiating contention random access (for example, for initiating high-priority services, high-priority terminals, multiple system messages request, location, etc.). The beam capability of the terminal device refers to whether the terminal beam has beam consistency. Network devices can be configured through signaling such as PDCCH order or RRC signaling. The specific implementation manner may be any one or more of the present invention, which will not be repeated here.

In an embodiment, the network device instructs the terminal device to associate a plurality of downlink signals. In an implementation manner, the terminal device always selects a random access preamble associated with a downlink signal that has no association relationship for transmission. One transmission method is: for a group of associated downlink signals, only the random access preamble corresponding to the downlink model with the best signal quality in the group is sent. For downlink signals that do not have a correlation relationship, according to the downlink quality from good to bad, the transmission beams with high to low gain are used to send in sequence. Another optional sending method is, for a group of associated downlink signals, send the random access preambles corresponding to all the downlink signals, but except for the downlink signal with the best quality, the random access preambles associated with the rest of the downlink signals The incoming leader is sent last.

In the present invention, the association relationship of downlink signals includes: belonging to the same group or quasi-colcation (quasi-colcation, QCL) relationship. The parameters included in the quasi-co-location (QCL) in the present invention refer to at least one of the following parameters being the same or having a definite correspondence: angle of arrival AoA (angle of arrival), main angle of incidence Dominant AoA, average angle of incidence, angle of incidence The power angular spectrum (PAS) of AoA), the exit angle AoD (angle of departure), the main exit angle, the average exit angle, the power angle spectrum of the exit angle, the terminal transmit beamforming, the terminal receive beamforming, the spatial channel Correlation, base station transmit beamforming, base station receive beamforming, average channel gain, average channel delay, delay spread, Doppler spread, etc.

For example: the network device sends 4 downlink signals: CSI-RS0, CSI-RS1, CSI-RS2, CSI-RS3, and the associated random access preambles are A0, A1, A2, A3, among them, CSI-RS0 and CSI-RS0 RS1 has the association relationship described in the present invention, for example: from the same transceiver device geographically, quasi-co-location with respect to large-scale channel parameters. The downlink signal quality satisfies: CSI-RS1<CSI-RS3<CSI-RS0<CSI-RS2. The terminal device generates 3 transmission beams. For example, if the beam gain satisfies: beam 2<beam 3<beam 1, firstly use beam 1 to send random access preamble A2, use beam 3 to send random access preamble A0, and use beam 2 to send random access preamble Access leading A3. Optionally, the terminal device generates 4 beams, for example, the beam gain satisfies: beam 4<beam 2<beam 3<beam 1, then firstly use beam 1 to send random access preamble A2, use beam 3 to send random access preamble A0, The random access preamble A3 is sent using beam 2, and finally the random access preamble A1 is sent using beam 4.

In another embodiment, the network device instructs the terminal device that downlink signals are periodically associated with a group of ROs, and the number of ROs is greater than or equal to the number of downlink signals. A random preamble transmission scheme is: the terminal device selects to send the corresponding random preamble only on one or more ROs associated with the downlink signal with the best signal quality, and optionally, uses power boosting to send the random preamble on the associated multiple ROs . Another sending scheme is: sort the downlink signal quality from good to bad, and use the beam gain from high to low to send corresponding random access preambles in sequence. Another sending scheme is: sort the downlink signal quality from good to bad, and send random access preambles at intervals in the order of highest beam gain-lowest-second highest-second lowest. Optionally, the above sending manners maintain the same target receiving power.

For example: the terminal device receives 3 downlink signals, and the signal quality satisfies: CSI-RS0<CSI-RS1<CSI-RS2, the number of ROs associated with the downlink signal cycle is 6, and CSI-RS0 is associated with RO0, RO3, and CSI-RS1 respectively It is associated with RO1 and RO4, and CSI-RS2 is associated with RO2 and RO5. The random access preambles associated with downlink signals are A0, A1, and A2 respectively. One transmission method is: the terminal device uses the transmission beam with the largest gain, and sends random preamble A2 on RO2 and RO5. Another transmission scheme is: the network device generates 3 beams, and the gain satisfies: beam 0<beam 1<beam 2, use beam 2 in turn, send random preamble A2 on RO2, RO5, use beam 1, on RO1, RO4 Send random preamble A1, adopt beam 0, send random preamble A0 on RO0, RO3. Another transmission scheme is: the network device generates 3 beams, and the gain satisfies: beam 0<beam 1<beam 2, use beam 2 in turn, send random preamble A2 on RO2 and RO5, use beam 1, use beam 0 on RO0 Send random preamble A0 on RO3 and RO3, and use beam 1 to send random preamble A1 on RO1 and RO4.

In a possible implementation, the terminal device needs to determine the location information (for example, determine the location information through positioning), at this time, any one of the methods for sending multiple random access preambles in this document can be used, and at least one sending beam can be used to A network device sends at least one random access preamble. I won't go into details here.

The transmission of multiple random access preambles herein may be within the same random access configuration period, or within the time period (or time period) corresponding to the association between the same downlink signal and the random access resource/preamble; It may be within multiple adjacent random access configuration periods, or within a time period (or time period) corresponding to the association of multiple downlink signals with random access resources/preambles. The sequence in time may refer to the sequence within the same random access configuration period or the time period (or time period) in which downlink signals are associated with random access resources/preambles, or may be multiple random access configuration periods Or the sequence within the time period (or time period) in which the downlink signal is associated with the random access resource/preamble.

In a possible implementation, the network device indicates resources used by the terminal device for random access through downlink control information and/or radio resource control information (Radio Resource control, RRC), and the resources include: one or more terminals The random access preamble for random access by the device, the association period between the downlink signal and the random access opportunity RO, the associated resource length between the downlink signal and the random access opportunity RO, and one or more random transmissions used to send the random access preamble One or more of the opportunity RO, the random access transmission opportunity RO mask and/or the downlink signal mask, the transmission power of the random access preamble, and the power boosting steps used in the sending process of multiple random access preambles.

The network device uses the mask to indicate to the terminal device that one or more downlink signals can be used to send the RO of the random preamble or the downlink signal associated with the RO during the period associated with the random access opportunity RO. The specific form of the mask can be a binary string, for example: 0001000, indicating the fourth RO, where 0/1 indicates the available RO position/index; or a decimal number, such as using 4 to indicate that the fourth RO is available; or other methods, Such as the form of the table, the specific form is not limited in the present invention. For example: the random access transmission opportunities RO associated with the downlink signal CSI-RS0 are RO0, RO1, RO2, RO3, RO4, RO5, RO6, and RO7, and the random transmission opportunity RO mask is 00100000, then the terminal device selects the RO2 The random access preamble is transmitted, and the remaining ROs are not transmitted. The downlink signal mask is used to indicate that the terminal is associated with a downlink signal of a valid random access opportunity. The specific form of the downlink signal mask is the same as the random access opportunity RO mask, which is not specifically limited in the present invention. For example, if the network device is configured with 4 downlink signals, namely CSI-RS0, CSI-RS1, CSI-RS2 and CSI-RS3, and the downlink signal mask is 0100, the terminal device selects the random access opportunity associated with CSI-RS1 .

Wherein, the transmission of the random access preamble on the random access opportunity may adopt one or a combination of methods described in the present invention. During the process of sending multiple random access preambles, the terminal device may adopt one or more power boosting methods described in the present invention.

In another possible implementation manner, the terminal device determines the sending order of the M random access preambles according to the configuration information sent by the network device, and the configuration information can be composed of radio resource control RRC signaling, system information SI, and remaining system information RMSI , system information block 1SIB1, MAC-CE signaling, downlink control information DCI, physical broadcast channel PBCH, and PDCCHorder to send at least one.

Wherein, after the terminal device sends the random access preamble once, the preamble transmission counter PREAMBLE_TRANSMISSION_COUNTER is increased by 1. Or, if the terminal equipment uses the same beam and uses the same random access preamble associated with the downlink signal to send, the power boosting counter PREAMBLE_POWER_RAMPING_COUNTER is incremented by 1.

In another implementation manner, the increase of the power up counter is related to one of the random access response window and the power ramp up indication information. For example: the power increase counter increases by 1 after each random access response window is received; another example: if the power ramp indication information indicates power increase and the terminal device maintains the same beam at least twice to send the same downlink signal associated random access The power boost counter is incremented by 1 only during preamble. In another embodiment, the increase of the power boost counter is also combined with the same power boost value (referring to the total boost power, for example, the product of the power boost counter minus 1 and the power boost step size) to switch the transmission beam of the terminal device The number of switching times and/or the switching times of the random access resources associated with the downlink signal, for example: at the same boosted power, the switching times of the transmission beam of the terminal equipment and/or the switching times of the random access resources associated with the downlink signal exceed When the pre-stored or pre-configured threshold value (which may be the same threshold value, or different threshold values, or the threshold value of the sum of switching times), the power boost counter is incremented by 1. Wherein, when the number of preamble transmissions or the preamble transmission counter reaches a pre-stored or pre-configured value, the terminal device considers that the random access fails.

Optionally, the sending sequence number of the random access preamble is represented by i, where i is an integer greater than 1, and the number of random access preambles sent each time can be multiple. Optionally, the multiple random access preambles sent each time are located in the same random access response window. Optionally, the terminal device determines whether to send the i-th random access preamble according to the instruction of the base station. Optionally, when no corresponding random access response is received within the random access response window corresponding to the i-1 random access preambles, the terminal device sends i random access preambles by itself.

Optionally, the downlink signal corresponding to the first sent random access preamble has the best signal quality and/or the highest beam gain. Optionally, the downlink signal corresponding to the first sent random access preamble has the best signal quality and/or the lowest beam gain.

Optionally, for the sending of two adjacent random access preambles, for example: i-1 times of sending random access preambles and the i-th sending of random access preambles, the i-th sending of random access preambles The number is greater than the number of random access preambles sent for the i-1th time. Optionally, the number of random access preambles sent for the ith time is not greater than the number of random access preambles sent for the i-1 time.

Optionally, a total of N random access preambles are sent in at least two adjacent random access preamble transmissions, where N is an integer greater than 1, and L random access preambles are sent successively in time. Wherein, the signal quality of the downlink signals associated with the L random access preambles ranges from good to poor, or from poor to good. Or the beam gains of the beams corresponding to the L random access preambles change from high to low, or from low to high. Optionally, the signal quality of the downlink signal corresponding to the first random access preamble sent after the L random access preambles is the same as the signal quality of the downlink signal corresponding to the first random access preamble among the L random access preambles. Optionally, the beam gain corresponding to the first sent random access preamble after the L random access preambles (or the terminal transmission beam) corresponds to the beam gain corresponding to the first random access preamble among the L random access preambles (or the terminal transmits beams) are the same.

The process of the network device receiving the M random access preambles is described below: when the network device receives any random access preamble among the M random access preambles, it responds to the random access preamble. Optionally, when the network device receives any number of random access preambles among the M random access preambles, it responds to one of the random access preambles, for example: responding to the random access preamble with the best signal quality, and for example : Response to the random access preamble received first. Optionally, when the network device knows the random access preamble that may be sent by the terminal device and the corresponding time and frequency position, and the network device receives any random access preamble among the multiple random access preambles, the detection is stopped by Other random access preambles sent by the same terminal device.

On at least one random access opportunity within the random access response window time, if at least one of the multiple random access preambles configured by the network device to the terminal device is located on the random access opportunity, the network device continues to receive and Detect random access preamble. In one implementation, the network device may respond to at least one detected random access preamble in a response message. Optionally, the random access response in the response message is set according to the strength of the signal quality corresponding to the detected random access preamble received by the network device. For example: in the response message, the random access response corresponding to the random access preamble received by the network device with strong signal quality (sent by the terminal device) is located before the random access response corresponding to the random access preamble with weak received signal quality. For another example: in the response message, the random access response corresponding to the random access preamble with strong received signal quality by the network device is located before the random access response corresponding to the random access preamble with weak received signal.

In an implementation manner, in the random access response window, the network device responds to M random access preambles through M response messages, and the terminal device receives the M response messages. Optionally, the time sequence in which the M response messages are sent is placed according to the strength of the signal quality corresponding to the random access preamble received and detected by the network device, and/or the random access response in the response message is arranged according to the strength of the network device Receive and place the strength and weakness of the quality signal corresponding to the detected random access preamble. For example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), the response random access preamble in the response message, and the corresponding received signal quality is sent later in time (corresponding to the terminal device in time The random access preamble of the response in the response message received first above). Another example: the response message sent by the network device first in time (corresponding to the first reception of the terminal device in time), and the response random access preamble in the response message, the corresponding received signal quality is sent later in time (corresponding to the terminal device in The random access preamble of the response in the response message received first in time).

Optionally, in the above implementation manner, the response message further includes the time and/or frequency position of the random access resource where the random access preamble is located.

Optionally, in the above implementation manner, the response message also includes the signal quality of at least one random access preamble received by the network device, for example: the RSRP corresponding to at least one first random access preamble, and/or at least one first random access preamble The RSRP difference between the second random access preamble and the first random access preamble.

In an implementation manner, after receiving the first random access response, the terminal device stops sending other random access preambles.

In an implementation manner, after receiving the pre-stored or pre-configured M random access responses, the terminal device stops receiving other random access responses, and/or stops sending other random access preambles.

In another implementation, the sending method of the random access response is indicated by the configuration information of the network device, and the terminal device receives the random access response according to the indication information, including but not limited to: the number of response messages, the number of random access responses, random At least one of the relationship between the time sequence of access preamble transmission and the transmission beam gain of the terminal equipment, the strength of downlink signal quality, the sequence of random access responses in the response message, and the relationship between the strength of received signal of the random access preamble.

Implement the embodiment in Figure 4 and implement the embodiment in Figure 3, when the terminal device sends multiple random access preambles, the random access preamble with high beam gain and good signal quality of the downlink signal precedes the signal quality of the downlink signal with low beam gain With poor beam transmission, the terminal device can first receive and decode the random access preamble with high beam gain, reducing the access time of random access and reducing the access delay.

In another implementation manner, the terminal device needs to use multiple different receiving beam directions to respectively receive downlink signals from multiple directions of the network device. In this case, the direction of the receiving beam of the terminal is required to match the direction of the downlink signal of the network device, so as to improve the performance and efficiency of link transmission. At this time, when the network device configures multiple random access preamble transmissions, some restrictions need to be considered to ensure that the user equipment can receive the random access response in the correct beam direction.

For example, for the downlink signals associated with multiple random access preambles configured by the network device, the terminal uses the same receiving beam (or the parameters corresponding to multiple receiving beams of the terminal are quasi-colocated: delay spread, Doppler spread, Dopplershift, average delay, and spatial Rx parameters) to obtain good performance; or the multiple random access preambles correspond to the beam direction of the downlink signal of the same network device (that is, all or part of the spatial parameters are the same or similar, or the delay spread corresponding to multiple downlink signals , Doppler spread, Doppler shift, average delay, and spatial Tx parameters quasi-co-located); or the multiple random access preambles are associated with the same downlink signal.

For another example: the network device configures multiple random access preambles corresponding to different downlink signals, and when the terminal determines to send multiple random access preambles, the random access preamble responses corresponding to the multiple random access preambles determined by the terminal have The following characteristics: can be received by the same terminal receiving beam (or the parameters corresponding to multiple receiving beams of the terminal are quasi-co-located: delay spread, Doppler spread, Doppler shift, average delay, and spatial Rxparameters), or the terminal has the ability to receive signals from multiple receiving beams at the same time The random access responses of multiple receiving beam directions, the responses corresponding to the multiple random access preambles are within the multiple receiving beam directions; the terminal is within the receiving window of the random access response corresponding to the multiple random access preambles. Receive random access responses in the multiple receive beam directions.

Another example: the terminal device does not want/cannot use multiple beams to receive random access responses that may come from different directions at the same time. At this time, the terminal can feed back information to the network device, and the network device schedules multiple The random access preamble is given to the terminal, and the random access responses corresponding to the multiple random access preambles may be in the same/similar direction (or the parameters corresponding to multiple receiving beams of the terminal are quasi-colocated: delay spread, Doppler spread, Doppler shift, average delay, and spatial Rx parameters) terminal receive beam reception. For another example, the terminal only receives in one beam direction (or antenna port, such as omni-directional receiving capability), at this time, the network device can arbitrarily schedule/configure random access preambles associated with multiple downlink signals in different downlink directions to the terminal.

In another implementation manner, for multiple random access preambles associated with multiple downlink signals, corresponding random access responses are sent at different times in the random access response window. At this time, the terminal device may receive responses corresponding to different random access preambles in different time periods. At this time, the random access preamble selected by the terminal device may not be limited, and/or the multiple random access preambles configured by the network device may not The access preamble is limited.

It should be noted that the methods provided by the various embodiments of the present invention can be used in combination, which will not be repeated here.

In this application, the downlink signal may refer to a synchronization signal block (synchronization signal block, SSblock), a channel state information reference signal (channel state information reference signal, CSI-RS), a reference signal, downlink data, system information, and downlink antenna ports. one or more.

A method for transmitting a random access signal according to an embodiment of the present invention has been described in detail above, and apparatus 5 according to an embodiment of the present invention is provided below.

In a possible implementation manner, apparatus 5 may implement the terminal device side of the embodiment shown in FIG. 2 a , and apparatus 5 includes a receiving unit 501 and a sending unit 502 .

The receiving unit 501 is configured to receive K downlink signals from a network device; wherein, the K downlink signals are associated with K random access preambles, and K is an integer greater than 1.

The sending unit 502 is configured to send M random access preambles among the K random access preambles to the network device according to the signal quality of the downlink signal; wherein, M≤K and M is an integer greater than 1, and the signal quality The sending time of the random access preamble associated with the good downlink signal is before the sending time of the random access preamble associated with the downlink signal with poor signal quality.

Optionally, the signal quality of the downlink signal includes at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, and a reference signal signal-to-interference-noise ratio RS-SINR.

Optionally, the downlink signal includes any one of synchronization signal/physical broadcast signal block SS/PBCH block and channel state information reference signal CSI-RS.

Optionally, the receiving unit is further configured to receive configuration information from the network device; wherein the configuration information includes an association relationship between a downlink signal and a random access preamble, a format of the random access preamble, a signal At least one of the quality threshold and the number M of actually sent random access preambles.

Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

In another possible implementation manner, the device 5 includes:

The sending unit 502 is configured to send K downlink signals to the terminal device; wherein, the K downlink signals are associated with K random access preambles, and K is an integer greater than 1.

The receiving unit 501 is configured to receive M random access preambles among the K random access preambles sent by the terminal device according to the signal quality of the downlink signal; where M≤K and M is an integer greater than 1, first The signal quality of the downlink signal associated with the received random access preamble is better than the signal quality of the downlink signal associated with the random access preamble received later.

Optionally, the signal quality of the downlink signal includes at least one of RSRP, RSRQ and RS-SINR.

Optionally, the downlink signal includes at least one of SS/PBCH block and CSI-RS.

Optionally, the sending unit 502 is further configured to send configuration information to the terminal device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, and the signal quality threshold and at least one of the number M of random access preambles actually sent.

Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signaling quality threshold.

In another possible implementation manner, the device 5 includes:

The receiving unit 501 is configured to receive K downlink signals from a network device; wherein, the K downlink signals are associated with K random access preambles, and K is an integer greater than 1.

The sending unit 502 is configured to send M random access preambles among the K random access preambles to the network device on M beams; wherein, M≤K and M is an integer greater than 1, and a beam with a high beam gain The transmission time of the beam is before the transmission time of the beam with a low beam gain.

Optionally, the downlink signal includes any one of SS/PBCH block and CSI-RS.

Optionally, the receiving unit 501 is also configured to receive configuration information from the network device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, and the signal quality At least one of the threshold and the number M of random access preambles actually sent.

Optionally, the sending powers of the M beams are incremented with the same boost power according to the sending order.

In another possible implementation manner, the device 5 includes:

The sending unit 502 is configured to send K downlink signals to the terminal device; wherein the K downlink signals are associated with K random access preambles.

The receiving unit 501 is configured to receive M random access preambles among the K random access preambles sent by the terminal device on M beams; wherein, the beam gain of the first received beam is higher than that of the later received beam The beam gain of the beam.

Optionally, the downlink signal includes at least one of SS/PBCH block and CSI-RS.

Optionally, the sending unit 502 is configured to send configuration information to the terminal device; wherein the configuration information includes the association relationship between the downlink signal and the random access preamble, the format of the random access preamble, and the signal quality At least one of the threshold and the number M of random access preambles actually sent.

Optionally, the signal quality of downlink signals associated with the M random access preambles is greater than the signal quality threshold.

Optionally, the sending powers of the M beams are incremented with the same boost power according to the sending order.

The device 5 described in the present invention can also be a field-programmable gate array (field-programmable gate array, FPGA) that realizes related functions, an application-specific integrated chip, a system chip (system on chip, SoC), a central processing unit (central processor unit) , CPU), a network processor (network processor, NP), a digital signal processing circuit, a microcontroller (micro controller unit, MCU), and a programmable logic device (programmable logic device, PLD) or other integrated chips can also be used.

In this application, the downlink signal may refer to a synchronization signal block (synchronization signal block, SSblock), a channel state information reference signal (channel state information reference signal, CSI-RS), a reference signal, downlink data, system information, and downlink antenna ports. one or more.

This embodiment is based on the same idea as the method embodiment in FIGS. 2a, 3 and 4, and the technical effect it brings is also the same. For the specific process, refer to the description of the method embodiment in FIGS. 2a, 3 and 4, which will not be repeated here.

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of another device 6 provided by an embodiment of the present invention. The device 6 may include a processor 601 and a memory 602 .

The memory 602 may be an independent physical unit, and may be connected to the processor 601 through a bus. The memory 602 and the processor 601 may also be integrated together, implemented by hardware, and the like.

The memory 602 is used to store programs for implementing the above method embodiments or modules of the device embodiments, and the processor 601 invokes the programs to execute the operations of the above method embodiments.

Optionally, when part or all of the method for sending and receiving the random access preamble in the above embodiments is implemented by software, the device may also only include a processor. The memory for storing programs is located outside the device, and the processor is connected to the memory through circuits/wires for reading and executing the programs stored in the memory.

The processor 601 may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP.

The processor 602 may further include a hardware chip. The aforementioned hardware chip may be an application-specific integrated circuit (application-specific integrated circuit, ASIC), a programmable logic device (programmable logic device, PLD) or a combination thereof. The aforementioned PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (field-programmable gate array, FPGA), a general array logic (generic array logic, GAL) or any combination thereof.

The memory may include a volatile memory (volatile memory), such as a random-access memory (random-access memory, RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory), Hard disk drive (hard disk drive, HDD) or solid-state drive (solid-state drive, SSD); the storage may also include a combination of the above types of storage.

The embodiment of the present application also provides a computer storage medium, storing a computer program, and the computer program is used to execute the method for sending and receiving the random access preamble provided in the above embodiment.

The embodiment of the present application also provides a computer program product containing instructions, which, when run on a computer, causes the computer to execute the method for sending and receiving the random access preamble provided in the above embodiments.

In this application, the downlink signal may refer to a synchronization signal block (synchronization signal block, SSblock), a channel state information reference signal (channel state information reference signal, CSI-RS), a reference signal, downlink data, system information, and downlink antenna ports. one or more.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present invention will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted via a computer-readable storage medium. The computer instructions may be transmitted from one website site, computer, server, or data center to another website site by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) , computer, server or data center for transmission. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), an optical medium (eg, DVD), or a semiconductor medium (eg, Solid State Disk (SSD)), etc."

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments are realized. The processes can be completed by computer programs to instruct related hardware. The programs can be stored in computer-readable storage media. When the programs are executed , may include the processes of the foregoing method embodiments. The aforementioned storage medium includes: ROM or random access memory RAM, magnetic disk or optical disk, and other various media that can store program codes.

Claims (19)

1. a kind of sending method of random access preamble characterized by comprising

Terminal device receives one or more downlink signals from the network equipment；Wherein, one or more of downlink signals It is associated with K random access preamble, K is the integer greater than 1；

The terminal device is sent in the K random access preamble according to the signal quality of downlink signal to the network equipment M random access preamble；Wherein, M≤K and M are the integer greater than 1, and the good downlink signal of signal quality is associated to be connect at random Enter leading sending time before the sending time of the associated random access preamble of downlink signal of poor signal quality.

2. a kind of method of reseptance of random access preamble characterized by comprising

The network equipment sends one or more downlink signals to terminal device；Wherein, one or more of downlink signals and K are a Random access preamble association, K are the integer greater than 1；

Before the network equipment receives the K random access that the terminal device is sent according to the signal quality of downlink signal M random access preamble in leading；Wherein, M≤K and M are the integer greater than 1, and the random access preamble first received is associated The signal quality of the associated downlink signal of the random access preamble that the signal quality of downlink signal receives after being better than.

3. a kind of sending device of random access preamble characterized by comprising

Receiving unit, for receiving one or more downlink signals from the network equipment；Wherein, one or more of downlinks Signal is associated with K random access preamble, and K is the integer greater than 1；

Transmission unit, for sending the K random access preamble to the network equipment according to the signal quality of downlink signal In M random access preamble；Wherein, M≤K and M are the integer greater than 1, and the good downlink signal of signal quality is associated random The sending time of access lead is before the sending time of the associated random access preamble of downlink signal of poor signal quality.

4. device as claimed in claim 3, which is characterized in that the signal quality of downlink signal includes Reference Signal Received Power It is one or more in RSRP, Reference Signal Received Quality RSRQ and reference signal Signal to Interference plus Noise Ratio RS-SINR.

5. device as described in claim 3 or 4, which is characterized in that downlink signal includes synchronization signal/physical broadcast block Any one in SS/PBCH block and channel state information reference signals CSI-RS.

6. the device as described in claim 3 to 5 any one, which is characterized in that

The receiving unit is also used to receive the configuration information from the network equipment；Wherein, under the configuration information includes Format, signal quality thresholding and the practical transmission of incidence relation, random access preamble between row signal and random access preamble One of the quantity M of random access preamble or a variety of.

7. device as claimed in claim 6, which is characterized in that the letter of the associated downlink signal of M random access preamble Number quality is greater than the signal quality thresholding.

8. a kind of reception device of random access preamble characterized by comprising

Transmission unit, for sending one or more downlink signals to terminal device；Wherein, one or more of downlink signals It is associated with K random access preamble, K is the integer greater than 1；

Receiving unit, the K random access sent for receiving the terminal device according to the signal quality of downlink signal M random access preamble in leading；Wherein, M≤K and M are the integer greater than 1, the random access preamble association first received Downlink signal signal quality be better than after the signal quality of the associated downlink signal of random access preamble that receives.

9. device as claimed in claim 8, which is characterized in that the signal quality of downlink signal includes RSRP, RSRQ and RS- It is one or more in SINR.

10. device as claimed in claim 8 or 9, which is characterized in that downlink signal includes SS/PBCH block and CSI-RS In it is one or more.

11. the device as described in claim 8 to 10 any one, which is characterized in that

The transmission unit is also used to send configuration information to the terminal device；Wherein, the configuration information includes downlink letter The format of incidence relation, random access preamble number between random access preamble, signal quality thresholding and actually send with One of quantity M of machine access lead or a variety of.

12. device as claimed in claim 11, which is characterized in that the associated downlink signal of M random access preamble Signal quality is greater than the signaling quality thresholding.

13. a kind of sending method of random access preamble characterized by comprising

Terminal device receives one or more downlink signals from the network equipment；Wherein, one or more of downlink signals It is associated with K random access preamble, K is the integer greater than 1；

The terminal device sends the M in the K random access preamble to the network equipment on M wave beam and connects at random Enter leading；Wherein, M≤K and M are the integer greater than 1, the sending time of the high wave beam of the beam gain wave beam low in beam gain Sending time before.

14. a kind of method of reseptance of random access preamble characterized by comprising

The network equipment sends one or more downlink signals to terminal device；Wherein, one or more of downlink signals and K are a Random access preamble association；

The network equipment receive the M in the K random access preamble that the terminal device is sent on M wave beam with Machine access lead；Wherein, the beam gain for the wave beam that the beam gain of the wave beam first received receives after being higher than.

15. a kind of sending device of random access preamble characterized by comprising

Receiving unit, for receiving one or more downlink signals from the network equipment；Wherein, one or more downlink signals It is associated with K random access preamble, K is the integer greater than 1；

Transmission unit, for sending M random access in K random access preamble to the network equipment on M wave beam It is leading；Wherein, M≤K and M are the integer greater than 1, and the sending time of the high wave beam of beam gain is in the low wave beam of beam gain Before sending time.

16. device as claimed in claim 15, which is characterized in that

The receiving unit is also used to receive the configuration information from the network equipment；Wherein, under the configuration information includes Row signal and the incidence relation of random access preamble, the format of random access preamble, signal quality thresholding, actually send it is random One of quantity M of access lead or a variety of.

17. a kind of reception device of random access preamble characterized by comprising

Transmission unit, for sending one or more downlink signals to terminal device；Wherein, one or more of downlink signals It is associated with K random access preamble；

Receiving unit, for receiving the M in the K random access preamble that the terminal device is sent on M wave beam Random access preamble；Wherein, the beam gain for the wave beam that the beam gain of the wave beam first received receives after being higher than.

18. device as claimed in claim 17, which is characterized in that

The transmission unit, for sending configuration information to the terminal device；Wherein, the configuration information includes downlink signal It the format of incidence relation, random access preamble between random access preamble, signal quality thresholding and actually sends random One of quantity M of access lead or a variety of.

19. the device as described in claim 17 or 18, which is characterized in that the associated downlink letter of M random access preamble Number signal quality be greater than the signal quality thresholding.