CN109121222B

CN109121222B - Communication method and communication device

Info

Publication number: CN109121222B
Application number: CN201710488237.2A
Authority: CN
Inventors: 樊波; 刘亚林
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-06-23
Filing date: 2017-06-23
Publication date: 2021-08-13
Anticipated expiration: 2037-06-23
Also published as: WO2018233503A1; CN109121222A

Abstract

A communication method and communication device, receiving at least two random access first messages through at least two receiving beams, and when the difference between the timing advances TA corresponding to the at least two receiving beams is greater than a preset threshold, sending A second random access message including the first TA; when the difference between the TAs corresponding to the at least two receiving beams is less than the preset threshold, a second random access message including the second TA is sent. By sending only one random access second message for the random access first messages sent by multiple terminal devices, the waste of time-frequency resources caused by sending multiple random access second messages can be avoided, and the delay of random access is low. , improve the utilization of time-frequency resources and improve the efficiency of random access.

Description

Communication method and communication device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and a device for communication in a wireless communication system.

Background

In new communication systems, high frequencies (e.g., frequencies greater than 6GHz) are often used for communication. At high frequencies, the path fading of the wireless signal is high, resulting in a short transmission distance of the wireless signal. In order to achieve effective coverage of wireless signals, beamforming technology is usually used to transmit information. Beamforming is a signal processing technology based on an antenna array, and signal energy is concentrated and transmitted to one direction through processing, so that the transmission distance of a signal in the direction is increased.

In beamforming techniques, a beam may be used to represent a direction or range of signal transmission or reception. The beams are divided into transmission beams and reception beams. The transmit beam characterizes the direction and range of the signal transmitted by the transmit end, while the receive beam characterizes the direction and range of the signal that the receive end can receive. The signal can only be successfully received if the transmit beam and the receive beam are aligned.

When the base station receives a random access message transmitted by the terminal device through beam scanning, it may receive a plurality of identical random access messages from a plurality of reception beams. In this case, the base station transmits response messages for multiple random accesses, which results in occupation and consumption of time-frequency resources.

Disclosure of Invention

Embodiments of the present application provide a communication method, device and related product, so as to reduce occupation and consumption of time-frequency resources due to sending of multiple random access response messages.

In one aspect, an embodiment of the present application provides a communication method, including:

receiving at least two random access first messages through at least two receive beams, the at least two random access first messages being transmitted by at least one terminal device;

when the difference value of Timing Advance (TA) values corresponding to any two of the at least two reception beams is greater than a preset threshold, selecting a TA corresponding to one reception beam from the at least two reception beams as a first TA, and sending a random access second message including the first TA;

and when the difference value of the TAs corresponding to any two of the at least two receiving beams is smaller than the preset threshold, determining a second TA, and sending a random access second message including the second TA, wherein the second TA is obtained according to the TA corresponding to each of the at least two receiving beams according to a preset rule.

By the method, only one random access second message is sent, so that the waste of time-frequency resources caused by sending a plurality of random access second messages can be avoided, the delay of random access is low, and the utilization rate of the time-frequency resources and the efficiency of random access are improved.

Optionally, the method may include receiving, by the base station, the at least two random access first messages, and sending one random access second message including the first TA or one random access second message including the second TA.

Optionally, the first TA may be a TA corresponding to a reception beam with the strongest signal strength among the at least two reception beams. The receiving wave beam with the strongest signal intensity is selected, so that the success rate of subsequent message receiving and sending can be ensured, the success rate of random access is further improved, and the reliability of random access is high.

Alternatively, the receiving beam with the strongest signal is selected, and the signal strength of which receiving beam is the highest can be determined by measuring the energy strength of the signal received on each receiving beam, for example, the average energy strength of the reference signal.

Optionally, the transmission beam used when the random access second message is transmitted may be a transmission beam corresponding to a time-frequency resource used by the at least one terminal device to transmit the random access first message. That is, the transmission beam used when the random access second message is transmitted may be a transmission beam having an association relationship with a time-frequency resource used by the at least one terminal device to transmit the random access first message.

Optionally, the preset rule includes, but is not limited to, one of the following ways:

taking an average value or a value close to the average value of the values of the TAs corresponding to each of the at least two reception beams as a value of the second TA;

taking the TA with the largest median of the TAs corresponding to each of the at least two reception beams as the second TA;

taking the TA with the smallest median of the TAs corresponding to each of the at least two reception beams as the second TA;

and taking the TA corresponding to the receiving beam with the strongest signal strength in the at least two receiving beams as the second TA.

Optionally, in this embodiment of the present application, the first random access message may be a message 1 sent by the terminal device to the base station in a random access process, the second random access message may be a message 2 sent by the base station to the terminal device in a random access process, the third random access message may be a message 3 sent by the terminal device to the base station in a random access process, and the fourth random access message may be a message 4 sent by the base station to the terminal device in a random access process.

In a possible implementation manner, when a difference between TAs corresponding to any two of the at least two receiving beams is smaller than the preset threshold, the random access second message further includes information indicating a number of times that the terminal device sends a random access third message;

wherein, the number of times of instructing the terminal device to send the random access third message in the random access second message is the same as the number of beams of the at least two receiving beams.

Optionally, a field may be added to the random access second message or an existing field may be multiplexed to indicate the terminal device to send the random access third message for the number of times.

In one possible implementation, the method further includes:

the random access second message further comprises information indicating a time-frequency resource used by the terminal device each time the random access third message is sent.

Optionally, the time-frequency resource included in the random access second message and used by the terminal device to send the random access third message each time is a time-frequency resource having an association relationship with the at least two receiving beams. That is, the random access third message sent by the at least one terminal device according to the indicated time-frequency resource can be received through the at least two receiving beams.

In one possible implementation, the method further includes:

the Time frequency resource used by the terminal device to send the random access third message is indicated to be located at multiple Transmission Time Intervals (TTIs) included in the random access second message.

Optionally, the time-frequency resource used by the terminal device to send the random access third message, indicated in the random access second message, is located in multiple consecutive TTIs.

In one possible implementation, the method further includes:

and receiving a random access third message sent by the at least one terminal device through each of the at least two receiving beams respectively.

In one possible implementation, the method further includes:

and when the at least one random access first message is sent by at least two terminal devices, sending a random access fourth message to each of the at least two terminal devices, wherein the random access fourth message comprises a TA field and a Temporary Cell Radio Network Temporary Identifier (C-RNTI) field.

Optionally, it is determined, by the Identifier (ID) of the terminal device, whether the received random access third message is sent by one terminal device or sent by more than two terminal devices.

In a possible implementation manner, when a TA in a random access fourth message sent to a terminal device needs to be modified, sending the modified TA to the terminal device through the random access fourth message;

and when the C-RNTI in the random access fourth message sent to the terminal equipment needs to be corrected, sending the corrected C-RNTI to the terminal equipment through the random access fourth message. In a possible implementation manner, the TA in the random access fourth message is a TA modified with respect to the TA in the random access second message; and/or the presence of a gas in the gas,

and the C-RNTI in the random access fourth message is the C-RNTI which is modified relative to the C-RNTI in the random access second message.

In a possible implementation manner, when a difference between TAs corresponding to any two of the at least two reception beams is greater than a preset threshold, a random access third message is received from the reception beam corresponding to the first TA.

In one possible implementation, sending a random access second message including the first TA or a random access second message including the second TA through a transmission beam; the transmission beam is a transmission beam corresponding to time-frequency resources used when the at least two random access first messages are transmitted.

In one possible implementation form of the method,

the at least two receive beams are within a coverage of one transmit beam and the at least two random access first messages include the same random access preamble.

Thus, the method also solves the problem of random access conflict caused when a plurality of terminal devices use the same time-frequency resource and lead code to send the random access first message.

In another aspect, an embodiment of the present application provides a communication method, including:

receiving a random access second message sent by a base station, wherein the random access second message comprises a time frequency resource for indicating the number of sending the random access third message and sending the random access third message each time;

and sending the random access third message according to the times of sending the random access third message and the time-frequency resource of sending the random access third message each time.

By the method, the received random access second message comprises the times of sending the random access third message and the time-frequency resource of sending the random access third message each time, so that the time-frequency resource waste caused by receiving a plurality of random access second messages can be avoided, and the random access efficiency can be improved. Optionally, the method includes that the terminal device receives a random access second message sent by the base station, and sends a random access third message.

In a possible implementation manner, the time-frequency resource for transmitting the random access third message each time is located on multiple TTIs.

Optionally, the time-frequency resource for sending the random access third message each time is located on multiple consecutive TTIs.

In one possible implementation, the method further includes:

receiving a random access fourth message sent by the base station, and judging whether the identifier of the terminal equipment carried in the random access fourth message is the same as the identifier of the terminal equipment;

when the identifier of the terminal equipment carried in the random access fourth message is the same as the identifier of the terminal equipment, receiving the random access fourth message;

and when the identifier of the terminal equipment carried in the random access fourth message is different from the identifier of the terminal equipment, discarding the received random access fourth message until whether the identifier of the terminal equipment carried in the received random access fourth message is the same as the identifier of the terminal equipment or the competition resolving timer is overtime.

In this way, when the identifier in the random access fourth message received by the terminal device is different from the identifier of the terminal device, the terminal device does not receive or discard the random access fourth message, and continues to receive the random access fourth message sent by the base station until the random access fourth message containing the identifier of the terminal device is received or until the contention resolution timer is overtime.

In a possible implementation manner, when the identifier of the terminal device carried in the random access fourth message is the same as the identifier of the terminal device itself

If the TA included in the random access fourth message is not a preset specific value, correcting the acquired TA according to the TA included in the random access fourth message;

and if the C-RNTI included in the random access fourth message is not a preset specific value, correcting the acquired C-RNTI according to the C-RNTI included in the random access fourth message.

In a possible implementation manner, a random access first message is sent to the base station within the coverage range of one sending beam of the base station;

the coverage range of the transmission beam also comprises other terminal equipment, and the random access preamble in the random access first message is the same as the random access preamble in the random access first message sent by the other terminal equipment.

The present application further provides a communication device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the program to make the communication device implement the steps performed by the method.

Embodiments of the present application also provide a computer-readable medium for storing a computer program, which, when executed, causes the method of the above aspect to be performed.

Embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the method of any possible implementation manner described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic diagram of a first implementation scenario of a transmission beam of a base station and a reception beam of a terminal device according to an embodiment of the present application;

fig. 2 is a schematic diagram of a second implementation scenario of a transmission beam of a base station and a reception beam of a terminal device according to an embodiment of the present application;

fig. 3(a) is a schematic diagram of a third implementation scenario of a transmission beam of a base station and a reception beam of a terminal device according to an embodiment of the present application;

fig. 3(b) is another schematic diagram of a third implementation scenario of a transmission beam of a base station and a reception beam of a terminal device according to the embodiment of the present application;

fig. 4 is a schematic flowchart of an implementation of a communication method according to an embodiment of the present application;

fig. 5 is a schematic flowchart of another implementation of a communication method according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

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

First, some terms and related technologies referred to in this application are explained to facilitate understanding:

1) terminal device

The terminal device in the present application is a device with wireless communication function, and may be a handheld device with wireless communication function, an in-vehicle device, a wearable device, a computing device or other processing device connected to a wireless modem, etc. The terminal devices in different networks may be called different names, for example: user equipment, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, Wireless communication device, user agent or user equipment, cellular telephone, cordless telephone, Session Initiation Protocol (SIP) telephone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), terminal equipment in a 5G network or future evolution network, and the like.

2) Base station

A Base Station in this application may also be referred to as a Base Station device, which is a device deployed in a radio Access network to provide a Wireless communication function, and may be a Base Station (BTS) in Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB or eNodeB) in Long Term Evolution (LTE), or a relay Station or Access point, a transmission Node or a Transceiver point (TRP, TP) in an NR System, or a next generation Node B (generation Node B, gb), a Wireless Fidelity (Wi-Fi), a Wireless Fidelity (Wi-Fi ), or a Wireless Transceiver Station in a Wireless Access network, A micro station, or a base station in a future fifth Generation Mobile Communication (5G) network, and the like, but the present application is not limited thereto.

3) A random access procedure;

the process of the terminal equipment randomly accessing the base station mainly comprises the following steps:

1, terminal equipment sends a random access message 1 to a base station, wherein the message 1 comprises a random access lead code;

2, the base station sends a response message of random access, namely a message 2, to the terminal equipment, and the response message is used for allocating uplink time-frequency resources for transmitting a message 3 and C-RNTI for receiving a message 4;

3, a terminal device sends a message 3 to a base station, where the message 3 may carry a Radio Resource Control (RRC) connection request and a Buffer Status Report (BSR) of a logical channel;

and 4, the base station sends a message 4 to the terminal equipment, and the terminal equipment receives the message 4 through the C-RNTI.

The random access is classified into a competitive random access and a non-competitive random access. In the contention-based random access scheme, for a terminal device, a Random Access Channel (RACH) is a resource pool to be selected, and different terminal devices may use the same RACH, thereby causing resource contention.

4) Timing advance TA

TA is the time required to be advanced when the terminal device transmits an uplink signal, that is, the time required to be advanced when the terminal device transmits a signal to the base station. Each terminal device adopts a corresponding TA to send signals according to the distance between the terminal device and the base station, so that the signals of all the terminal devices can reach the base station at the same time. The terminal equipment needs to adopt the correct TA to successfully send the signal to the base station. In the random access process, the TA is measured by the base station when receiving the message 1 and is sent to the terminal device through the message 2, and the terminal device sends the subsequent message by using the acquired TA. The base station receives the messages 1 sent by the terminal equipment from a plurality of receiving beams, and can measure the TA corresponding to each message 1.

5) Wave beam

A beam (beam) may be understood as a spatial resource and may refer to a transmission or reception precoding vector having an energy transmission directivity. And, the transmission or reception precoding vector can be identified by index information. The energy transmission directivity may refer to that, in a certain spatial position, a signal subjected to precoding processing by the precoding vector is received with good reception power, such as meeting a reception demodulation signal-to-noise ratio; the energy transmission directivity may also mean that the same signal transmitted from different spatial locations received through the precoding vector has different reception powers.

Optionally, the same communication device (e.g. terminal device or network device) may have different precoding vectors, and different devices may also have different precoding vectors, i.e. corresponding to different beams. One communication device may use one or more of a plurality of different precoding vectors at the same time, i.e. may form one or more beams at the same time, depending on the configuration or capabilities of the communication device. The information of the beam may be identified by index information. Optionally, the index information may be configured to correspond to a resource identifier of the UE, for example, the index information may correspond to an ID or a resource of a configured Channel state information Reference Signal (CSI-RS), or may correspond to an ID or a resource of a configured uplink Sounding Reference Signal (SRS). Or, alternatively, the index information may also be index information explicitly or implicitly carried by a signal or channel carried by a beam, for example, the index information may be index information indicating the beam by a synchronization signal or a broadcast channel transmitted by the beam.

The beam pair may include a transmission beam at a transmitting end and a reception beam at a receiving end, or may also be referred to as an uplink beam or a downlink beam. For example, the beam pair may include a gNB Tx beam transmission beam or a UE Rx beam reception beam, or a UE Tx beam transmission beam or a gNB Rx beam reception beam, wherein the transmission beam may also be understood as a transmission beam.

6) Communication resource

In this application, a communication resource may also be simply referred to as a resource. Communication resources may be used to transmit signals. Communication resources are of various types. For example: from the physical property point of view, the type of the communication resource may be a spatial resource, a time domain resource, and a frequency domain resource. For example: from a different manifestation point of view, the type of communication resource may be a beam, a port, etc. A collection of heterogeneous communication resources is also a communication resource. For example: a time-frequency resource (including both time-domain and frequency-domain) is a communication resource, as is a combination of beams and ports.

7) Other terms

The term "plurality" herein means two or more.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Fig. 1 is a schematic diagram of an implementation scenario of a transmit beam of a base station and a receive beam of a terminal device. As shown in fig. 1, an ellipse in the figure represents a beam, and when the base station transmits information to the terminal device, only the signal of the transmission beam in the middle can reach the terminal device, and the terminal device can only receive signals from the reception beam in the middle. No other beams can receive the signal. Therefore, to transmit information to the terminal device, the base station needs to perform advanced beam matching to determine the correct transmit beam of the base station and the correct receive beam of the terminal device. Similarly, the terminal device also needs to perform beam matching when transmitting information to the base station. However, when the terminal device has just accessed the cell, it has not yet matched the transmit beam and receive beam of the base station. In this case, to transmit and receive information, advanced beam scanning is required. For example, when receiving the message 1 in the random access procedure, the base station needs to use multiple receiving beams to receive the message 1 respectively, so as to receive the message 1 and determine the correct receiving beam.

In addition, in the initial access process of the terminal device, in order to achieve better coverage, the base station may use higher transmission power, so that the angle of the transmission beam of the base station is wider. However, for the terminal device, due to its limited energy, it cannot use too high power, resulting in a transmission beam of the terminal device being often narrow. The base station also uses a correspondingly narrower receive beam for reception in order to achieve higher receive gain. This results in a scenario where the base station transmits signals from a wider beam, but receives signals from a narrower beam, such as the scenario shown in fig. 2. In fig. 2, the base station has a wide transmission beam and a narrow reception beam, and one transmission beam covers the range of two reception beams.

In addition, the terminal device may determine the transmission beam of the base station by receiving the synchronization signal before the random access. That is, the terminal device can determine which transmission beam of the base station is directed to itself and notify the determined transmission beam of the base station to the base station through message 1 in the random access procedure. The method for the terminal equipment to inform is based on the incidence relation between the sending wave beam of the base station and the time frequency resource adopted by the message 1 sent by the terminal equipment. That is, when the base station receives the message 1 sent by the terminal device, the time-frequency resource used when the terminal device sends the message 1 is measured, and according to the corresponding relationship between the time-frequency resource and the sending beam, the base station can know which sending beam is directed to the terminal device. The adoption of the technology can lead to that the terminal devices within the same transmission beam coverage range of the base station all adopt the same time-frequency resource to transmit the message 1. If multiple terminal devices happen to use the same preamble (in the contention-based random access process, the preamble sent by the message 1 is selected by the terminal devices themselves), the base station cannot distinguish whether the messages 1 come from the same terminal device or multiple terminal devices because the preamble and the time-frequency resource are the same.

Therefore, when the base station receives the message 1 by using beam scanning and receives the same message 1 (the same time-frequency resource and preamble are included in the message 1) from multiple receiving beams, the base station cannot determine whether the messages 1 are from the same terminal device or multiple terminal devices. As shown in fig. 3(a), the base station receives a message 1 transmitted by the same terminal device (terminal device 1) via a reception beam 1 and a reception beam 2. As shown in fig. 3(b), the base station receives the message 1 transmitted by different terminal devices (terminal device 2 and terminal device 3) through the reception beam 1 and the reception beam 2. In both cases, the base station cannot distinguish whether the messages 1 originate from the same terminal device or from a plurality of terminal devices, if the terminal devices have used exactly the same preamble again.

In this case, it is common practice for the base station to transmit a plurality of messages 2. The base station sends a plurality of messages 2 to occupy certain time-frequency resources, which causes the occupation and consumption of the time-frequency resources.

The embodiment of the application provides a communication method and equipment, so as to reduce the occupation and consumption of time-frequency resources caused by sending a plurality of messages 2 in the random access process.

With terminal device 1 and terminal device 2 located within the coverage of one transmission beam of the base station, the base station receives the message transmitted by terminal device 1 through reception beam 1 and receives the message transmitted by terminal device 2 through reception beam 2; and terminal device 1 and terminal device 2 initiate random access using the same preamble as an example. It can be understood that, for the implementation manner when more than three terminal devices perform random access in one transmission beam of the base station, the implementation manner when two terminal devices perform random access in one transmission beam of the base station in the embodiment of the present application may be referred to, and details are not described again.

Fig. 4 is a flowchart illustrating an implementation of a communication method according to an embodiment of the present application. As shown in fig. 4, the method includes:

step 101: the method comprises the steps that a terminal device 1 and a terminal device 2 respectively send a message 1 of random access to a base station, and the base station respectively receives the message 1 sent by the terminal device 1 and the terminal device 2;

specifically, the base station receives the message 1 of random access transmitted by the terminal device 1 through the receiving beam 1, and the base station receives the message 1 of random access transmitted by the terminal device 2 through the receiving beam 2.

Step 102: the base station measures the TA corresponding to the receiving beam used when receiving each message 1 and judges the difference value of any two TAs in the plurality of TAs obtained by measurement;

if the difference value of any two measured TA is larger than the preset threshold value, executing step 103A-step 106A in FIG. 4; if the difference between any two TA's is less than the predetermined threshold, then steps 103B-106B of FIG. 5 are performed.

In this embodiment, two terminal devices are taken as an example for explanation, for example, if the terminal device 1 sends the message 1 through the receiving beam 1 of the base station, the base station measures the TA corresponding to the receiving beam 1, that is, the TA when the terminal device 1 sends the message 1 is TA 1; terminal device 2 sends message 1 through receiving beam 2 of the base station, and then the base station measures the TA corresponding to receiving beam 2, that is, TA when terminal device 2 sends message 1 is TA 2. The base station compares whether the difference between TA1 and TA2 is greater than a preset threshold.

Step 103A: when the measured difference value of any two TA in the multiple TA is larger than a preset threshold value, the base station selects one TA from the multiple TA as a first TA, and sends a random access message 2, wherein the message 2 comprises the first TA;

when the measured values of TA1 and TA2 are greater than the preset threshold, it indicates that the distance between terminal device 1 and terminal device 2 and the base station is large. In this case, the base station sends a message 2, and the message 2 only includes one TA, i.e. the first TA. Because only one random access message 2 is sent, two different messages 2 are not needed to be sent, and the occupation and consumption of time-frequency resources caused by sending a plurality of random access messages 2 in the random access process are reduced. It can be understood that when the number of the terminal devices is more than 3, the time-frequency resources that can be reduced are more.

Optionally, when the base station selects the TA, the TA corresponding to the receiving beam with the strongest signal strength may be selected as the first TA. For example, among the reception beams 1 and 2, the first TA is TA1 when the terminal apparatus 1 transmits the message 1 if the signal strength of the reception beam 1 is strongest. The receiving wave beam with the strongest signal intensity is selected, so that the success rate of subsequent message receiving and sending can be ensured, the success rate of random access is further improved, and the reliability of random access is high.

Alternatively, the base station selects the receiving beam with the strongest signal, and may determine which receiving beam has the highest signal strength by measuring the energy strength of the signal received on each receiving beam, for example, the average energy strength of the reference signal. The reference signals include, but are not limited to: demodulation reference signal (DMRS), SRS, or the like.

In a specific implementation, the transmission beam used when the base station transmits the message 2 is a transmission beam corresponding to the time-frequency resource used by the terminal device to transmit the message 1. Since terminal 1 and terminal 2 are located within the coverage of one transmission beam of the base station, both terminal 1 and terminal 2 can receive the message 2 transmitted by the base station.

It should be noted that the threshold in the embodiment of the present application may be set differently based on a specific scenario, and the embodiment of the present application does not limit the specific threshold. As long as it can effectively distinguish different terminal devices and satisfy the condition of random access, the threshold may be used as the threshold described in the embodiment of the present application.

Step 104A: after receiving the message 2, the terminal device 1 and the terminal device 2 respectively send a message 3 to the base station;

when the terminal device 1 and the terminal device 2 send the message 3, the first TA acquired from the message 2 will be carried. For example, the message 3 sent by the terminal device 1 to the base station includes the first TA, and the message 3 sent by the terminal device 2 to the base station also includes the first TA. In this case, the TAs carried in the messages 3 sent by the terminal device 1 and the terminal device 2 are the same and both are the first TA.

Step 105A: the base station receives a message 3 through a receiving beam corresponding to the first TA;

for example, if the base station selects the TA corresponding to the reception beam 1 as the first TA, the message 3 sent by the terminal device 1 can be successfully received, and the message 3 sent by the terminal device 2 cannot be received. The terminal device 2 fails to access in the random access process, and may retransmit the message 1 of random access after randomly returning for a period of time.

In this way, only the terminal device having the same TA as the first TA can successfully send the message 3 of random access, which can limit the random access of one terminal device, and solve the problem of collision caused by the terminal device 1 and the terminal device 2 simultaneously using the same preamble to initiate random access.

Step 106A: the base station sends a message 4 of random access to the terminal device.

The base station may send a message 4 of random access to the terminal device 1 based on the received message 3 of random access.

If the difference between any two TAs of the plurality of TAs measured by the base station is smaller than the preset threshold in step 102, the method provided in the embodiment of the present application is shown in fig. 5. In fig. 5, after performing step 101 and step 102, the method further comprises:

step 103B: when the measured difference value of any two TA in the plurality of TA is smaller than a preset threshold value, the base station determines a second TA and sends a random access message 2; the message 2 includes the second TA and information indicating the number of times that the terminal device sends the message 3.

The second TA may be obtained by the base station according to a preset rule, and according to a preset rule, the TA1 corresponding to the receive beam 1 and the TA2 corresponding to the receive beam 2. The preset rules include, but are not limited to: the average value of TA1 and TA2 or a value close to the average value, the TA of the maximum value of TA1 and TA2, and the TA of the minimum value of TA1 and TA2 or the TA corresponding to the reception beam having the largest signal intensity are taken.

Optionally, the value of the second TA may also be other values capable of representing multiple TAs, so that each terminal device can send the message 3 to the base station and can successfully send the message after receiving the second TA from the message 2.

Specifically, when the base station sends the message 2, the base station sends the message 2 by using a sending beam corresponding to the time-frequency resource when the terminal device sends the message 1. Since the terminal device 1 and the terminal device 2 are located in the coverage of one transmission beam of the base station, the transmission beam of the base station corresponding to the time-frequency resource when the terminal device 1 transmits the message 1 is the same as the transmission beam of the base station corresponding to the time-frequency resource when the terminal device 2 transmits the message 1. Therefore, both terminal device 1 and terminal device 2 can receive the same message 2 transmitted by the base station.

Optionally, the number of times that the base station instructs the terminal device to send the message 3 may be determined according to the number of receiving beams used when the base station receives the message 1. For example, the base station instructs the terminal device to transmit message 3 the same number of times as the number of receive beams used when the base station receives message 1. In this embodiment, the base station receives the message 1 sent by the terminal device 1 and the message 1 sent by the terminal device 2 through two different receiving beams (receiving beam 1 and receiving beam 2), respectively, and then indicates that the number of times the terminal device sends the message 3 is 2 in the message 2. It can be understood that, when the base station receives message 1 sent by N or M terminal devices through N receive beams, the base station indicates in message 2 that the number of times the terminal device sends message 3 is N. Wherein N and M are integers greater than 0, and M is greater than or equal to N.

Optionally, the base station indicates the number of times that the terminal device sends the message 3, which may be indicated by adding a field in the message 2 or by multiplexing existing fields in the message 2. For example, in LTE, message 2 includes fields: a random backoff parameter field (for calculating a random backoff time) of the retransmission message 1, a random sequence ID field adopted by the message 1 (for the terminal device to identify which message 1 the message 2 is in response to), a TA field, an uplink resource scheduling (UL-grant) field for transmitting the message 3, and a field of C-RNTI for receiving the message 4. The base station may add a field in the message 2 to indicate the number of times that the terminal device sends the message 3, or may multiplex any one of the random backoff parameter field of the retransmission message 1, the random sequence ID field adopted by the message 1, the TA field, the UL-grant field, and the C-RNTI field to indicate the number of times that the terminal device sends the message 3.

Optionally, the message 2 may further include information indicating a time-frequency resource used by the terminal device each time the message 3 is sent. The base station indicates in message 2 the number of times the terminal device sends message 3 in order to be able to receive messages 3 sent by all terminal devices. In order to ensure that all terminal devices can successfully send the message 3, the time-frequency resources used by the terminal devices each time the message 3 is sent may be indicated.

Specifically, the time-frequency resource included in the message 2, which is used by the indication terminal device when sending the message 3 each time, is a time-frequency resource having a management relationship with the receiving beam used when receiving the message 1. For example, in this embodiment, the time-frequency resource included in the message 2 and used by the terminal device to send the message 3 each time is a time-frequency resource having an association relationship with one of the receiving beam 1 and the receiving beam 2. That is, when the terminal device sends the message 3 according to the time-frequency resource used in sending the message 3 each time indicated in the message 2, the base station can receive the message by the receiving beam 1 or the receiving beam 2.

The time-frequency resources used by the base station to instruct the terminal device to transmit the message 3 each time may be different. Optionally, the time-frequency resource used by the base station to instruct the terminal device to send the message 3 each time may be a time-frequency resource on consecutive TTIs.

Step 104B: after receiving the same message 2, the terminal device 1 and the terminal device 2 respectively send messages 3 to the base station;

the terminal device 1 and the terminal device 2 respectively transmit the message 3 according to the times of transmitting the message 3 indicated in the message 2. For example, if the number of times of sending the message 3 is indicated to be 2 in the message 2, the terminal device 1 sends the message 3 twice, and the terminal device 2 also sends the message 3 twice.

Optionally, when the message 2 sent by the base station further includes information indicating a time-frequency resource used by the terminal device when sending the message 3 each time, the terminal device 1 and the terminal device 2 send the message 3 on the indicated time-frequency resource for sending the message 3 each time according to the indication of the message 2.

For example, terminal device 1 corresponds to reception beam 1 of the base station, and terminal device 2 corresponds to reception beam 2 of the base station. The base station indicates to send message 3 twice in message 2 sent and sends message 3 on two consecutive TTIs. Then, in the first TTI, terminal device 1 and terminal device 2 send message 3 respectively; in the second TTI, terminal 1 and terminal 2 each send a message 3.

And, when sending the message 3, the terminal device also carries the second TA obtained from the message 2. For example, the message 3 sent by the terminal device 1 to the base station includes the second TA carried in the message 2, and the message 3 sent by the terminal device 2 to the base station also includes the second TA carried in the message 2.

Step 105B: a base station receives a message 3 sent by a terminal device 1 and a terminal device 2;

optionally, when the message 2 sent by the base station further includes information indicating a time-frequency resource used by the terminal device when sending the message 3 each time, the base station receives the message 3 on each corresponding time-frequency resource.

For example, terminal device 1 corresponds to base station receive beam 1, and terminal device 2 corresponds to base station receive beam 2; the message 2 transmitted by the base station indicates that the message 3 is transmitted in two consecutive TTIs, and the terminal device 1 and the terminal device 2 respectively transmit the message 3 in two consecutive TTIs. Then the base station can receive the message 3 sent by the terminal device 1 via the receive beam 1 in the first TTI. In the second TTI, the base station may receive message 3 sent by terminal device 2 via receive beam 2.

Thus, with two receive beams, the base station can receive the message 3 sent by the terminal device 1 and the terminal device 2. The problem that the base station cannot receive the messages 3 sent by a plurality of terminal devices from different receiving beams simultaneously can be solved. The base station may receive the message 3 sent by all the terminal devices in a time division manner.

Step 106B: the base station sends a message 4 to the terminal device.

Specifically, the base station can determine whether the messages 3 are from one terminal device or a plurality of terminal devices through the received messages 3. For example, the base station may determine, according to the ID of the terminal device carried in the received message 3, whether the message 3 is sent by one terminal device or the messages 3 sent by multiple terminal devices.

If the received message 3 is from a terminal device, the base station only sends a message 4.

If the received message 3 comes from a plurality of terminal devices, a message 4 needs to be sent to each terminal device. For example, the base station may transmit different messages 4 at different times, respectively. Each terminal device judges whether the ID contained in the received message 4 is the same as its own ID after receiving the message 4. If the same, the message 4 is received, if different, the message 4 is discarded, and the listening to the control channel continues to receive the message 4. Until the ID contained in the received message 4 is the same as the ID of the message 4, if the received message 4 is sent to the message, the message 4 is not continuously received; or the random access contention timer is over time, the message 4 is received unsuccessfully, and the message 4 is not received any more.

Since in step 103B, the base station only sends one message 2, where the message 2 includes one TA (the second TA), which results in that although some or all terminal devices successfully send the message 3, the TA value in the message 3 sent by the terminal devices is not completely correct, and therefore the base station needs to send the correct TA to the terminal device with the incorrect TA through the message 4. Meanwhile, the base station only designates one temporary C-RNTI in the message 2, and each terminal device needs to have the only C-RNTI in the cell after the random access is finished. Therefore, only one terminal device can continue to use the temporary C-RNTI as a formal C-RNTI, and the rest terminal devices need to be re-assigned with the C-RNTI. Therefore, the base station needs to carry the modified C-RNTI in the transmitted message 4.

In order to enable each terminal device to successfully complete random access, the base station needs to carry modified TA and C-RNTI in the sent message 4, for example, the modified TA and C-RNTI may be carried by two fields.

Optionally, the base station may add two new fields to carry the modified TA and C-RNTI in the message 4, may directly modify the existing TA and C-RNTI fields to the modified TA and C-RNTI, and may also multiplex the existing fields to carry the modified TA and C-RNTI.

The following describes that the base station sends the modified TA and C-RNTI to the terminal device through the message 4 by taking the example that the base station adds two fields carrying the modified TA and C-RNTI in the message 4.

Correction for TA: the base station firstly judges whether the measured TA when receiving the message 3 is the same as the TA carried in the message 3. The TA carried by the terminal device in the message 3 is the second TA, and the TA measured when the base station receives the message 3 is a specific TA when each terminal device sends the message 3. If the two are different, the TA needs to be corrected. That is, the base station takes the value of the TA measured when receiving the message 3 as the value of the modified TA of the terminal device, and adds a field for recording the value of the modified TA in the message 4.

Correction of C-RNTI: when the base station determines that a plurality of terminal devices are randomly accessed, only one terminal device can continuously use the temporary C-RNTI without correcting the C-RNTI; and for other terminal equipment, the message 4 sent by the base station carries the modified C-RNTI, so that each terminal equipment is ensured to have a unique C-RNTI.

After receiving the message 4 sent by the base station, each terminal device first judges whether the ID is the same as the ID of itself according to the ID carried in the message 4. If the message 4 is the same as the original message, the message 4 is confirmed to be sent to the user, and the newly added TA field and the C-RNTI field in the message 4 are read.

Optionally, if the value read by the terminal device from the TA field or the C-RNTI field is a specific value (for example, all 0 s), it indicates that the TA or C-RNTI does not need to be modified, and the terminal device may continue to use the TA or C-RNTI carried in the received message 2. If the value read by the terminal device from the TA field or the C-RNTI field is not a specific value, the terminal device obtains the contents of the two fields and updates the TA and C-RNTI thereof.

In this way, the base station can realize the simultaneous random access of a plurality of terminal devices by only sending one message 2, thereby avoiding the waste of time-frequency resources caused by sending a plurality of messages 2 and solving the problem of random access collision caused when a plurality of terminal devices use the same time-frequency resources and lead codes to send the message 1.

The above embodiment takes random access initiated by two terminal devices as an example for explanation. When there are more than 3 terminal devices within the coverage of one transmission beam of the base station and the message 1 is transmitted using the same random access preamble, there may be more than 3 different TAs. For example, the base station has 5 different TAs after measurement, where the difference between two TAs is greater than the preset threshold, and the difference between three TAs is less than the preset threshold. In this case, the base station may refer to the implementation manners of steps 103A to 106A for the terminal device corresponding to the TA whose difference is greater than the preset threshold; and the terminal equipment corresponding to the TA with the difference value smaller than the preset threshold value is realized by referring to the implementation modes of the step 103B-the step 106B. And will not be described in detail.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It is to be understood that each network element, for example, a base station or a terminal device, includes corresponding hardware structures and/or software modules for performing the above functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the methods or steps of the examples described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the base station or the terminal device may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given taking the example of dividing each functional module corresponding to each function.

The embodiment of the application also provides a communication device 600. The communication device 600 may be a base station. Fig. 6 shows a simplified base station structure. The base station includes a portion 601 and a portion 602. The 601 part is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; the 602 section is mainly used for baseband processing, base station control, and the like.

The radio frequency unit in 601 is mainly used for radio frequency processing. Optionally, a device for implementing a receiving function in the portion 601 may be regarded as a receiving unit, and a device for implementing a transmitting function may be regarded as a transmitting unit, that is, the portion 601 includes a receiving unit and a transmitting unit. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like, and a transmitting unit may be referred to as a transmitter, a transmitting circuit, or the like.

Section 602 may include one or more boards, each board may include one or more processors, and one or more memories for reading and executing programs in the memories to implement baseband processing functions and control of the base station. If a plurality of single boards exist, the single boards can be interconnected to increase the processing capacity. As an alternative implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may share one or more processors at the same time.

Portion 601 may be generally referred to as a transceiver unit, transceiver, transceiving circuitry, or transceiver, etc. Part 602 is typically the control center of the base station, which may be generally referred to as a processing unit, for controlling the base station to perform the steps described above with respect to the base station in fig. 4 and 5. For example, the part 602 may perform the steps or functions in fig. 4 or fig. 5, where the base station determines the difference of the TAs, selects the TAs, determines the number of times that the terminal device is instructed to send the message 3, time-frequency resources, and determines whether the message 4 sent to the terminal device needs to be modified; part 601 may perform the steps or functions of fig. 4 or fig. 5, in which the base station receives

messages

1 and 3 of random access sent by the terminal device, and transmits messages 2 and 4 of random access to the terminal device. For details, reference may be made to the description of the relevant parts above, and details are not repeated.

The embodiment of the present application further provides a communication device 700, where the communication device 700 may be a terminal device. Fig. 7 shows a simplified schematic diagram of a terminal device. For easy understanding and illustration, in fig. 7, the terminal device is illustrated by taking a mobile phone as an example. As shown in fig. 7, the terminal includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminals may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 7. In an actual end product, there may be one or more processors, and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 7, the terminal device includes a transceiving unit 701 and a processing unit 702. The transceiver unit 701 may also be referred to as a transceiver, a transceiving device, etc. The processing unit 702 may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device in the transceiver unit 701 for implementing the receiving function may be regarded as a receiving unit, and a device in the transceiver unit 701 for implementing the transmitting function may be regarded as a transmitting unit, that is, the transceiver unit 701 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

The communication device shown in fig. 7 may perform the steps performed in fig. 4 and 5 above with respect to the terminal device. For example, the processing unit 702 may execute the steps or functions of generating the message 3, determining the sending mode of the message 3, and selecting to receive the message 4 by the terminal device in fig. 4 or 5 according to the indication in the message 2; the transceiving unit 701 performs the steps of the terminal device in fig. 4 or fig. 5 transmitting the message 1 and the message 3 of the random access and receiving the message 2 and the message 4 of the random access. For details, reference may be made to the description of the relevant parts above, and details are not repeated.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that:

receiving at least two random access first messages through at least two receive beams, the at least two random access first messages being sent by at least one terminal device;

When the difference between the timing advances TA corresponding to any two of the at least two receive beams is greater than a preset threshold, select a TA corresponding to one receive beam from the at least two receive beams as the first TA , sending a random access second message including the first TA;

When the difference between the TAs corresponding to any two of the at least two receiving beams is smaller than the preset threshold, a second TA is determined, and a second random access message including the second TA is sent, The second TA is obtained according to a preset rule according to a TA corresponding to each of the at least two receiving beams.

2. method according to claim 1, is characterized in that:

When the difference between the TAs corresponding to any two of the at least two receiving beams is smaller than the preset threshold, the random access second message further includes instructing the terminal device to send the number of times the random access third message is sent Information;

Wherein, the number of times that the terminal device is instructed to send the third random access message in the second random access message is the same as the number of beams of the at least two receiving beams.

3. The method according to claim 2, wherein the method further comprises:

The second random access message further includes information indicating time-frequency resources used by the terminal device each time the third random access message is sent.

4. The method according to claim 3, wherein the method further comprises:

The time-frequency resources included in the second random access message instructing the terminal device to send the third random access message are located in multiple transmission time intervals TTI.

5. The method according to any one of claims 2-4, wherein the method further comprises:

The random access third message sent by the at least one terminal device is received through each of the at least two receiving beams, respectively.

6. The method according to any one of claims 2-4, wherein the method further comprises:

When the at least two random access first messages are sent by at least two terminal devices, a random access fourth message is sent to each of the at least two terminal devices, and the random access first message is sent to each of the at least two terminal devices. Four messages include a TA field and a temporary cell radio network temporary identity C-RNTI field.

7. The method according to claim 6, wherein:

The TA in the fourth random access message is a modified TA relative to the TA in the second random access message; and/or,

The C-RNTI in the fourth random access message is a modified C-RNTI relative to the C-RNTI in the second random access message.

8. The method according to claim 1, wherein:

When the difference between the TAs corresponding to any two of the at least two receiving beams is greater than a preset threshold, a third random access message is received from the receiving beams corresponding to the first TA.

9. The method according to any one of claims 1-4 and 8, wherein the method further comprises:

sending a random access second message including the first TA or a random access second message including the second TA by sending a beam;

The transmit beam is a transmit beam corresponding to the time-frequency resource used when the at least two random access first messages are transmitted.

10. The method according to any one of claims 1-4 and 8, wherein the at least two receiving beams are within the coverage of one transmitting beam, and the at least two random access first messages contains the same random access preamble.

11. A communication method, characterized in that:

Receive a second random access message including the first TA sent by the base station, or receive a second random access message including the second TA sent by the base station, where the second random access message includes an instruction to send a random access second message. The number of three messages and the time-frequency resources for randomly accessing the third message each time;

The third random access message is sent according to the times of sending the third random access message and the time-frequency resources for sending the third random access message each time.

12. The method of claim 11, wherein:

The time-frequency resources for sending the third random access message each time are located in multiple transmission time intervals TTI.

13. The method of claim 11, wherein the method further comprises:

receiving the fourth random access message sent by the base station, and determining whether the identity of the terminal device carried in the fourth random access message is the same as the identity of the terminal;

receiving the fourth random access message when the identifier of the terminal device carried in the fourth random access message is the same as its own identifier;

When the identifier of the terminal device carried in the fourth random access message is different from the self identifier, discard the received fourth random access message until the terminal device carried in the fourth random access message is received Whether the identity of the is the same as its own identity or the contention resolution timer has expired.

14. The method of claim 13, wherein the method further comprises:

When the identifier of the terminal device carried in the fourth random access message is the same as the self identifier, if the TA included in the fourth random access message is not a preset specific value, the The TA included in the four messages corrects the acquired TA;

If the C-RNTI included in the fourth random access message is not a preset specific value, modify the acquired C-RNTI according to the C-RNTI included in the fourth random access message.

15. The method according to any one of claims 11-14, wherein:

sending a random access first message to the base station within the coverage of one transmit beam of the base station;

The coverage of the transmitting beam also includes other terminal equipment, the random access preamble in the first random access message and the random access preamble in the first random access message sent by the other terminal equipment same.

16. A communication device comprising a memory, a processor and a computer program stored in the memory and runnable on the processor, characterized in that, when the processor executes the program, the communication device is implemented as claimed in the claims The method of any one of 1-15.