CN105723793A - Random access method and device - Google Patents

Abstract

A method and device for random access, wherein the method is as follows. When the public enhanced dedicated channel is accessed, the indication of falling back to the physical random access channel is detected; determine whether the transmit power parameter of the preamble sent during the last access to the public enhanced dedicated channel is greater than the threshold parameter, if the last time in The transmit power parameter of the common enhanced dedicated channel access sending preamble is greater than the threshold parameter, and the preamble is sent on the physical random access channel with the power corresponding to the threshold parameter. On the one hand, the technical solution can reduce the UE's interference to other users in the cell, and on the other hand, it can improve the random access efficiency of the UE.

Description

A random access method and device

technical field

The present invention relates to the field of communication technology, in particular to a random access method and device.

Background technique

In the UMTS system, user equipment (UE, UserEquipment) has cell dedicated channel (CELL_DCH, CELL-dedicatedChannel) state, cell forward access state (CELL_FACH, CELL-ForwardAccessChannel) state, cell paging channel (CELL_PCH, CELL-PagingChannel) ) state, registration area paging (URA_PCH, UTRANRegistrationArea_PagingChannel) state, and idle (IDLE) state. UEs in idle state, CELL_FACH state, CELL_PCH state, or URA_PCH state do not maintain dedicated resources, and UEs must perform random access procedures before initiating services.

Random access includes two types, namely physical random access channel (PRACH, PhysicalRandomAccessChannel) access and public enhanced dedicated channel (commonE-DCH, commonEnhancedDedicatedChannel) access. Currently, some UEs can support PRACH access and commonE-DCH access at the same time. When the commonE-DCH is accessed, if the network side is busy, the UE can choose PRACH access to improve the success rate of random access; some UEs only support PRACH access. , when the network side is busy, the UE can randomize the waiting time in terms of time, so as to avoid multiple UEs competing for the same resource on the network side at the same time, and improve the success rate of random access.

However, for a UE that can support PRACH access and commonE-DCH access at the same time, when the commonE-DCH access fails, the UE falls back to PRACH access. When the UE uses PRACH access, the power to send the preamble (preamble) The power of the last preamble sent when the commonE-DCH is accessed may be very high, which will cause great interference to other users in the cell when the UE accesses the PRACH.

On the other hand, for a UE that only supports PRACH access, the UE receives a negative acknowledgment (ie NACKINAICH, NegativeAcknowledgmentINAcquisitionIndicatorChannel) on the acquisition indicator channel during PRACH access, indicating that the UE has failed in random physical layer access this time. However, If the UE still has a chance to perform random access again, the UE randomizes the waiting time in time. During the process of randomizing the waiting time, the UE starts the TB01 timer. The relevant parameters of the timer are read by the UE. Obtained in the system information block 5 (SystemInformationBlock5), the UE obtains the parameters related to the TB01 timer, which cannot be updated in time according to the load or network interference. As a result, the UE still needs to back off for a long time when the load is light, which increases the random access. time, reducing the efficiency of random access.

Contents of the invention

Embodiments of the present invention provide a method and device for random access, which can reduce UE's interference to other users in a cell and improve the efficiency of UE random access.

In the first aspect, a random access method is provided. The method includes:

An indication to fall back to a physical random access channel is detected when the public enhanced dedicated channel is accessed;

judging whether the transmit power parameter of the last public enhanced dedicated channel access transmission preamble is greater than a threshold parameter,

If the transmit power parameter of the last preamble sent on the public enhanced dedicated channel access is greater than the threshold parameter, the preamble is sent on the physical random access channel with the power corresponding to the threshold parameter.

In a first possible implementation, according to the first aspect, the transmission power parameter is transmission power, and the determination of whether the transmission power parameter of the last public enhanced dedicated channel access transmission preamble is greater than the threshold parameter, if the last The transmission power parameter of sending the preamble on the public enhanced dedicated channel access is greater than the threshold parameter, and the preamble is sent on the physical random access channel with the power corresponding to the threshold parameter, specifically including:

Judging whether the transmit power of the preamble sent during the last access to the public enhanced dedicated channel is greater than the threshold power,

If the last transmission power of the preamble sent on the public enhanced dedicated channel access is greater than the threshold power, the preamble is sent on the physical random access channel with the threshold power.

In a second possible implementation manner, in combination with the first aspect or the first possible implementation manner, the method further includes:

If the transmit power of the preamble sent on the public enhanced dedicated channel access for the last time is not greater than the threshold power, the preamble is sent on the physical random access channel with the transmit power of the preamble sent on the public enhanced dedicated channel access for the last time.

In a third possible implementation manner, the transmit power parameter is the number of times the preamble is sent,

Said judging whether the transmission power parameter of the last public enhanced dedicated channel access transmission preamble is greater than the threshold parameter, if the last transmission power parameter of the public enhanced dedicated channel access transmission preamble is greater than the threshold parameter, the threshold parameter corresponds to The power to send the preamble on the physical random access channel specifically includes:

Judging that the last time the preamble was sent in the public enhanced dedicated channel access is the Zth time, whether it is greater than the threshold number M, if greater, sending the preamble on the physical random access channel with the power corresponding to the threshold number of times.

In a fourth possible implementation manner, in combination with the first aspect or the third possible implementation manner, the method further includes:

Judging that the last number of times the preamble was sent in the public enhanced dedicated channel access is the Zth time, which is not greater than the threshold number M, and the preamble is sent on the physical random access channel with the transmission power of the last public enhanced dedicated channel access sent preamble .

In a fifth possible implementation manner, in combination with the first aspect or any one of the first possible implementation manner to the fourth possible implementation manner, the detection of falling back to Indications for physical random access channels include:

When the public enhanced dedicated channel is accessed, send the preamble to the network side device;

When neither a positive acknowledgment indication nor a negative acknowledgment indication is detected on the AICH channel,

Send the preamble to the network side device with the increased transmit power;

After receiving the negative acknowledgment (NACK) sent by the network side device on the acquisition indication channel, it falls back to the physical random access channel access.

In a second aspect, a random access device is provided, and the device includes: a detection unit, a first judging unit, and a sending unit;

The detection unit is configured to detect an indication of falling back to a physical random access channel when the public enhanced dedicated channel is accessed;

The first judging unit is configured to judge whether the transmission power parameter of the last public enhanced dedicated channel access transmission preamble is greater than a threshold parameter,

The sending unit is configured to send the preamble on the physical random access channel with the power corresponding to the threshold parameter if the last transmission power parameter for sending the preamble on the public enhanced dedicated channel access is greater than the threshold parameter.

In a first possible implementation manner, according to the second aspect, the transmit power parameter is transmit power;

The first judging unit is specifically used to judge whether the transmission power of the last public enhanced dedicated channel access transmission preamble is greater than the threshold power;

The sending unit is specifically configured to send the preamble on the physical random access channel with the threshold power if the last transmission power of the preamble sent on the public enhanced dedicated channel access is greater than the threshold power.

In the second possible implementation manner, in combination with the second aspect or the first possible implementation manner, the sending unit is further configured to: if the transmission power of the last public enhanced dedicated channel access to send the preamble is not greater than the threshold power , sending the preamble on the physical random access channel with the transmit power of the last preamble sent on the public enhanced dedicated channel access.

In a third possible implementation manner, the transmit power parameter is the number of times the preamble is sent,

The first judging unit is specifically used to judge whether the number of times the last access to send the preamble in the public enhanced dedicated channel is the Zth time, and whether it is greater than the threshold number of times M;

The sending unit is specifically configured to send the preamble on the physical random access channel with the power corresponding to the threshold number of times if the last number of times to send the preamble on the public enhanced dedicated channel is the Zth time, which is greater than M.

In a fourth possible implementation manner, in combination with the second aspect or the third possible implementation manner, the sending unit is further configured to determine that the last number of times the preamble was sent in public enhanced dedicated channel access is the Zth time, The number of times M is not greater than the threshold, and the preamble is sent on the physical random access channel with the transmission power of the last preamble sent on the public enhanced dedicated channel access.

In a fifth possible implementation manner, in combination with the second aspect or any one of the first possible implementation manner to the fourth possible implementation manner, the detection unit includes: a sending preamble unit, a sending climbing power unit, and receiving unit;

The sending preamble unit is configured to send the preamble to the network side device when the public enhanced dedicated channel is accessed;

The sending ramp-up power unit is used to send the preamble to the network side device with the ramped-up transmit power when neither a positive acknowledgment indication nor a negative acknowledgment indication is detected on the AICH channel;

The receiving unit is configured to fall back to physical random access channel access after receiving a negative acknowledgment (NACK) sent by the network side device on the acquisition indication channel.

In a third aspect, a random access device is provided, characterized in that it includes:

The processor is configured to detect an indication of falling back to a physical random access channel when the public enhanced dedicated channel is accessed; it is used to determine whether the transmit power parameter for sending the preamble in the public enhanced dedicated channel access for the last time is greater than Threshold parameter,

The transmitter is configured to transmit the preamble on the physical random access channel with the power corresponding to the threshold parameter if the transmission power parameter of the last access to send the preamble on the public enhanced dedicated channel is greater than a threshold parameter.

In a first possible implementation manner, according to the third aspect, the transmit power parameter is transmit power;

The processor is specifically used to judge whether the transmission power of the last public enhanced dedicated channel access transmission preamble is greater than the threshold power;

The transmitter is specifically configured to send the preamble on the physical random access channel with the threshold power if the last transmission power of the preamble sent on the public enhanced dedicated channel access is greater than the threshold power.

In the second possible implementation, combined with the third aspect or the first possible implementation,

The transmitter is further configured to, if the last transmit power of the preamble sent on the public enhanced dedicated channel access is not greater than the threshold power, the physical random access The channel sends the preamble.

In a third possible implementation manner, the transmit power parameter is the number of times the preamble is sent,

The processor is specifically used to determine whether the number of times the last access to send the preamble in the public enhanced dedicated channel is the Zth time, and whether it is greater than the threshold number of times M;

The transmitter is specifically configured to send the preamble on the physical random access channel with the power corresponding to the threshold number of times if the last number of times to send the preamble on the public enhanced dedicated channel access is the Zth time, which is greater than M.

In a fourth possible implementation manner, in combination with the third aspect or the third possible implementation manner, the transmitter is further configured to determine that the last number of times the preamble was sent in public enhanced dedicated channel access is the Zth time, The number of times M is not greater than the threshold, and the preamble is sent on the physical random access channel with the transmission power of the last preamble sent on the public enhanced dedicated channel access.

In a fifth possible implementation manner, in combination with the third aspect or any one of the first possible implementation manner to the fourth possible implementation manner, the transmitter is further configured to access , send the preamble to the network side device;

The processor is further configured to send the preamble to the network side device with the increased transmit power when neither a positive acknowledgment indication nor a negative acknowledgment indication is detected on the AICH channel;

The random access apparatus further includes: a receiver, configured to fall back to physical random access channel access after receiving a negative acknowledgment (NACK) sent by the network side device on the acquisition indication channel.

In a fourth aspect, a random access method is provided, the method comprising:

Receive the random fallback parameter information sent by the network device;

determining an expiration time of a random backoff timer according to the random backoff parameter information;

A negative acknowledgment indication is detected on the acquisition indication channel when the public enhanced dedicated channel or physical random access channel is used;

start the random backoff timer;

After the random backoff timer expires, perform a persistence check;

After the persistence check is passed, random access is initiated on the public enhanced dedicated channel or physical random access channel.

In a first possible implementation manner, according to the fourth aspect, the random rollback parameter information is specifically a dynamic persistence level value.

In a second possible implementation manner, according to the fourth aspect, the random backoff parameter information is a mapping table of service types and random backoff factors;

The determining the expiration time of the random backoff timer according to the random backoff parameter includes:

Determine the type of service that the user terminal triggers random access;

The expiration time of the random backoff timer is determined from the mapping table according to the service type that the user terminal triggers random access.

In a third possible implementation manner, according to the fourth aspect, the random backoff parameter information is a mapping table of logical channel priorities and random backoff factors;

The determining the expiration time of the random backoff timer according to the random backoff parameter includes:

determining a logical channel priority corresponding to a service that triggers random access by the user terminal;

According to the logical channel priority corresponding to the service type that the user terminal triggers the random access, the expiration time of the random backoff timer is determined from the mapping table.

In a fourth possible implementation manner, according to the fourth aspect, the random backoff parameter information is a mapping table of an access level or an access service level and a random backoff factor;

The expiration time of the random backoff timer is determined from the mapping table according to the access class of the user terminal.

In a fifth possible implementation manner, in combination with any one of the first possible implementation manner to the fourth possible implementation manner, the determination of the expiration time of the random backoff timer according to the random backoff parameter , including:

According to the range of the expiration time of timer TB01 obtained in the system message, a value is randomly generated within the range, the number is multiplied by 2 ^N , and the multiplied result is used as the expiration time of timer TB01, where N is the random backoff factor, or N is the dynamic persistence level value;

Or, according to the range of the deadline of timer TB01 obtained in the read system message, keep the minimum value of the range unchanged, set the maximum value of the range to 10*2 ^N , and randomly select a number in the new range as The expiration time of the timer TB01, wherein, N is the random backoff factor, or N is the dynamic persistent read level value;

Or, according to the range of the deadline of timer TB01 obtained in the read system message, the maximum value of the range is kept unchanged, the minimum value of the range is set to 10*2 ^N , and a number is randomly selected in the new range as Expiration time of timer TB01, wherein, N is a random backoff factor, or N is the value of the dynamic persistent read level.

In the fifth aspect, a random access device is provided. The device includes: a first receiving unit, an acquisition deadline unit, a first detection unit, a start unit, a persistence detection unit, and an access unit;

The first receiving unit is configured to receive random backoff parameter information sent by the network device;

The acquiring cut-off time unit is used to determine the cut-off time of the random back-off timer according to the random back-off parameter information;

The first detection unit is configured to detect a negative acknowledgment indication on an acquisition indication channel during a public enhanced dedicated channel or a physical random access channel;

The starting unit is configured to start the random backoff timer;

The persistence detection unit is configured to perform a persistence check after the random backoff timer expires;

The access unit is configured to initiate random access on a public enhanced dedicated channel or a physical random access channel after the persistence check is passed.

In a first possible implementation manner, according to the fifth aspect, the random rollback parameter information is specifically a dynamic persistence level value.

In a second possible implementation manner, according to the fifth aspect, the random backoff parameter information is a mapping table of service types and random backoff factors;

The acquisition deadline unit is specifically used to determine the service type that triggers random access for the user terminal and determine the deadline for the random backoff timer from the mapping table according to the service type that triggers random access for the user terminal.

In a third possible implementation, according to the fifth aspect, the random backoff parameter information is a mapping table of logical channel priorities and random backoff factors;

The acquisition deadline unit is specifically used to determine the logical channel priority corresponding to the service that the user terminal triggers random access; according to the logical channel priority corresponding to the service type that the user terminal triggers random access, from the The expiration time of the random backoff timer is determined in the mapping table.

In a fourth possible implementation manner, according to the fifth aspect, the random backoff parameter information is a mapping table of an access level or an access service level and a random backoff factor;

The acquisition deadline unit is specifically configured to determine the deadline of the random backoff timer from the mapping table according to the access level of the user terminal.

In the fifth possible implementation manner, in combination with any one of the first possible implementation manner to the fourth possible implementation manner, the acquisition of the cut-off time unit is specifically configured to The range of the cut-off time, a value is randomly generated within the range, the number is multiplied by 2 ^N , and the result of the multiplication is used as the cut-off time of the timer TB01, where N is a random rollback factor, or N is The dynamic persistence grade value;

Or, it is specifically used to keep the minimum value of the range unchanged and the maximum value of the range to 10*2 ^N according to the range of the deadline of the timer TB01 obtained in the read system message, and randomly select one in the new range Number, as the deadline of timer TB01, wherein, N is a random rollback factor, or N is the dynamic persistence level value;

Or, it is specifically used to keep the maximum value of the range unchanged and the minimum value of the range to 10*2 ^N according to the range of the expiration time of the timer TB01 obtained in the read system message, and randomly select one in the new range The number is used as the expiration time of the timer TB01, wherein, N is a random backoff factor, or N is the dynamic persistence level value.

In a sixth aspect, a random access device is provided, including;

a receiver, configured to receive random fallback parameter information sent by the network device;

A processor, configured to determine the expiration time of the random backoff timer according to the random backoff parameter information; for detecting a negative acknowledgment indication on the acquisition indication channel when the public enhanced dedicated channel or the physical random access channel is used; It is used to start the random back-off timer; it is used to perform a persistence check after the random back-off timer expires; it is used to initiate a random access on a public enhanced dedicated channel or a physical random access channel after the persistence check passes. enter.

In a first possible implementation manner, according to the sixth aspect, the random rollback parameter information is specifically a dynamic persistence level value.

In a second possible implementation manner, according to the sixth aspect, the random backoff parameter information is a mapping table of service types and random backoff factors;

The processor is further configured to determine the type of service that triggers random access by the user terminal; and determine the expiration time of the random backoff timer from the mapping table according to the service type that triggers random access by the user terminal

In a third possible implementation manner, according to the sixth aspect, the random backoff parameter information is a mapping table of logical channel priorities and random backoff factors;

The processor is further configured to determine the logical channel priority corresponding to the service that the user terminal triggers random access; according to the logical channel priority corresponding to the service type that the user terminal triggers random access, from the mapping table Determines the expiration time of the random backoff timer in .

In a fourth possible implementation manner, according to the sixth aspect, the random backoff parameter information is a mapping table of an access level or an access service level and a random backoff factor;

The processor is further configured to determine the expiration time of the random backoff timer from the mapping table according to the access class or access service class of the user terminal.

In a fifth possible implementation manner, in combination with any one of the first possible implementation manner to the fourth possible implementation manner, the processor is further configured to: The range of time, a value is randomly generated within the range, the number is multiplied by 2 ^N , and the result of the multiplication is used as the cut-off time of timer TB01, where N is the random back-off factor, or N is the Dynamic persistence level value;

Or, it is also used to keep the minimum value of the range unchanged and the maximum value of the range to 10*2 ^N according to the range of the timer TB01 expiration time obtained from the read system message, and randomly select one in the new range Number, as the deadline of timer TB01, wherein, N is a random rollback factor, or N is the dynamic persistence level value;

Or, it is also used to keep the maximum value of the range unchanged and the minimum value of the range to 10*2 ^N according to the range of the deadline of timer TB01 obtained from the read system message, and randomly select one in the new range The number is used as the expiration time of the timer TB01, wherein, N is a random backoff factor, or N is the dynamic persistence level value.

In a random access method provided by an embodiment of the present invention, when the UE returns to PRACH access after commonE-DCH access fails, it first judges whether the transmission power of the last preamble sent during commonE-DCH access is greater than the threshold power , if it is greater than the threshold power, the preamble is sent on the PRACH with the threshold power. It can reduce the UE's interference to other users in the cell.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a flow chart of the service processing method provided by the first method embodiment of the present invention;

FIG. 2 is a flow chart of a random access method provided in Embodiment 2 of the method of the present invention;

FIG. 3 is a flow chart of a random access method provided by Embodiment 3 of the method of the present invention;

FIG. 4 is a flow chart of a random access method provided by Embodiment 4 of the method of the present invention;

FIG. 5a is a flow chart of a random access method provided in Embodiment 5 of the method of the present invention;

Fig. 5b is a flow chart of the operation of randomizing the waiting time provided by the fifth embodiment of the method of the present invention;

FIG. 6a is a schematic diagram of a random access device provided by Embodiment 6 of the method of the present invention;

Fig. 6b is a schematic diagram of the detection unit in Embodiment 6 of the method of the present invention;

FIG. 7 is a schematic diagram of a random access device provided by Embodiment 7 of the method of the present invention;

FIG. 8 is a schematic diagram of a random access device provided by Embodiment 8 of the method of the present invention;

FIG. 9 is a schematic diagram of a random access device provided by Embodiment 9 of the method of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The technology described in this article can be used in various communication systems, such as current 2G, 3G communication systems and next-generation communication systems, such as Global System for Mobile Communications (GSM, Global System for Mobile communications), Code Division Multiple Access (CDMA, CodeDivisionMultipleAccess) system, Time Division Multiple Access (TDMA, TimeDivisionMultipleAccess) system, wideband code division multiple access (WCDMA, WidebandCodeDivisionMultipleAccessWireless), frequency division multiple access (FDMA, FrequencyDivisionMultipleAddressing) system, orthogonal frequency division multiple access (OFDMA, OrthogonalFrequency-DivisionMultipleAccess) system, single carrier FDMA (SC- FDMA) system, General Packet Radio Service (GPRS, General Packet Radio Service) system, Long Term Evolution (LTE, Long Term Evolution) system, and other such communication systems.

Various aspects are described herein in connection with user equipment and/or base stations and/or base station controllers.

The user equipment may be a wireless terminal or a wired terminal. The wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The wireless terminal can communicate with one or more core networks via the radio access network (for example, RAN, RadioAccessNetwork), and the wireless terminal can be a mobile terminal, such as a mobile phone (or called a "cellular" phone) and a computer with a mobile terminal , for example, may be portable, pocket, handheld, computer built-in, or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. For example, personal communication service (PCS, PersonalCommunicationService) phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL, WirelessLocalLoop) station, personal digital assistant (PDA, PersonalDigitalAssistant) and other equipment. Wireless terminal can also be called system, subscriber unit (SubscriberUnit), subscriber station (SubscriberStation), mobile station (MobileStation), mobile station (Mobile), remote station (RemoteStation), access point (AccessPoint), remote terminal (RemoteTerminal) , an access terminal (AccessTerminal), a user terminal (UserTerminal), a user agent (UserAgent), a user device (UserDevice), or a user equipment (UserEquipment).

A base station (eg, access point) can refer to a device in an access network that communicates with wireless terminals over the air interface through one or more sectors. The base station can be used to convert received over-the-air frames to and from IP packets, acting as a router between the wireless terminal and the rest of the access network, which can include an Internet Protocol (IP) network. The base station may also coordinate attribute management for the air interface. For example, the base station can be a base station (BTS, BaseTransceiverStation) in GSM or CDMA, or a base station (NodeB) in WCDMA, or an evolved base station (NodeB or eNB or e-NodeB, evolutionalNodeB) in LTE. Applications are not limited.

The base station controller may be a base station controller (BSC, basestation controller) in GSM or CDMA, or a radio network controller (RNC, RadioNetwork Controller) in WCDMA, which is not limited in this application.

Additionally, the terms "system" and "network" are often used herein interchangeably. The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Embodiment one

An embodiment of the present invention provides a method for random access, as shown in FIG. 1 , and the method is as follows.

101. An indication of falling back to a physical random access channel is detected when a public enhanced dedicated channel is accessed.

102. Determine whether the transmit power parameter of the last access to send preamble on the public enhanced dedicated channel is greater than a threshold parameter.

103. If the last transmission power parameter for sending the preamble on the public enhanced dedicated channel access is greater than a threshold parameter, send the preamble on the physical random access channel with the power corresponding to the threshold parameter.

Further, the method may further include: 104, if the transmit power parameter of the last access to send the preamble on the public enhanced dedicated channel is not greater than the threshold parameter, use the transmit power of the last access to send the preamble on the public enhanced dedicated channel The preamble is sent on the physical random access channel.

In a random access method provided by an embodiment of the present invention, when the UE returns to PRACH access after commonE-DCH access fails, it first judges whether the transmission power of the last preamble sent during commonE-DCH access is greater than the threshold power , if it is greater than the threshold power, the preamble is sent on the PRACH with the threshold power. It can reduce the UE's interference to other users in the cell.

Embodiment two

An embodiment of the present invention provides a random access method. For R11, the fallback to physical random access channel (FallbacktoR99PRACH) feature is introduced. After the UE is returned to the PRACH access, when the PRACH initiates access, it does not read the information in SIB7, so that the UE cannot obtain the information contained in SIB7 in real time. Common enhanced dedicated channel interference value. The purpose of the common enhanced dedicated channel interference value is to enable the UE to calculate the transmit power for initial access of the UE according to the common enhanced dedicated channel interference value.

The UE can read the common enhanced dedicated channel interference value contained in SIB5 after powering on, and calculate the initial access transmit power during commonE-DCH access according to the common enhanced dedicated channel interference value obtained from SIB5. Since the information read in SIB5 cannot be changed in time according to the real-time network conditions, the setting of the common enhanced dedicated channel interference value in SIB5 is very conservative. detected by the network side device.

Even after the network-side device detects it, in many scenarios, the network-side device returns a Discontinuous Transmission (DTX, Discontinuous Transmission) message to the UE, that is, the network-side device does not send any indication after detecting the preamble sent by the UE, that is, does not send ACK , nor send NACK. Therefore, when the UE accesses the commonE-DCH, the transmission power is gradually increased. Until the network side device sends a NACK message to the UE on the AICH, the UE returns to PRACH access.

After the UE returns to PRACH access, the transmission power of the preamble sent by the UE is the same as the transmission power of the last preamble sent when the commonE-DCH is accessed, it is easy to be detected by the network side equipment, but at the same time, other users in the cell cause great disturbance. Therefore, in the embodiment of the present invention, after the UE returns to PRACH access, the UE selects a reasonable transmission power for sending the preamble according to judgment, so as to avoid interference to other users in the cell.

The specific method is shown in Figure 2, and the method is described as follows.

201. The UE sends a preamble to a network side device when accessing a commonE-DCH.

202. After sending the preamble, after waiting for a set time, if the UE does not receive ACK or NACK on the AICH, send the preamble to the network side device with the increased transmission power, wherein the increased transmission power is the same as the last time the preamble was sent The difference in transmit power can be fixed, or can be set according to specific actual conditions.

Wherein, the set waiting time may be 1.5 time slots, or 2.5 time slots, or other waiting times.

It should be understood that if no ACK or NACK is received on the AICH, the UE accessing the commonE-DCH will increase the transmit power for sending the preamble, which is called the increased transmit power to send the preamble.

203. When the UE accesses the commonE-DCH, it receives a NACK indication sent by the network side device on the AICH, and falls back to accessing the PRACH. The specific operations are as follows in 204 to 207.

204. The UE judges whether the transmission power of the preamble sent last time when accessing the commonE-DCH is greater than the threshold power (Power-Threshold), and if so, executes 205 to send the preamble on the PRACH with the threshold power.

If the UE judges in 204 that the transmission power of the preamble sent during the last access to the public enhanced dedicated channel is greater than the threshold power, execute 206, and then send the preamble on the PRACH with the transmission power of the last access to the public enhanced dedicated channel to send the preamble.

Wherein, when the UE receives the NACK message, it indicates that the random access of the UE using the commonE-DCH fails, and the UE falls back to the PRACH access.

It should also be understood that the threshold power (Power-Threshold) can be predefined or configurable. The function of the threshold power makes the power of sending the preamble not exceed the threshold power when the UE falls back to PRACH access, reducing the interference caused by the UE to other users in the cell.

In a random access method provided by an embodiment of the present invention, when the UE returns to PRACH access after commonE-DCH access fails, it first judges whether the transmission power of the last preamble sent during commonE-DCH access is greater than the threshold power , if it is greater than the threshold power, the preamble is sent on the PRACH with the threshold power. It can reduce the UE's interference to other users in the cell.

Preferably, the embodiment of the present invention may also include the following 207 before 201, which is used to reduce the number of power ramp-ups of the UE when accessing the commonE-DCH.

207. The UE acquires a common enhanced dedicated channel uplink interference value (UpLinkInterferenceforcommonE-DCH) from the network side in real time. Wherein, a specific implementation of 207 may be: the UE reads the public enhanced dedicated channel interference value included in the SIB7 in real time. This is only an example for easy understanding, and does not limit other specific implementation methods of 207 .

Due to the addition of the above 207, 201 specifically includes: calculating the transmit power for sending the preamble according to the obtained public enhanced dedicated channel interference value, and sending the preamble to the network side with the calculated transmit power.

By adding 207, the UE can obtain the public enhanced dedicated channel interference value in real time, calculate the transmit power for sending the preamble, and send the preamble to the network side with the calculated transmit power. Among them, the calculated transmission power makes the UE easier to be discovered by the network side equipment, avoiding that the UE power can only be discovered by the network side equipment after several times of power increase, and improves the efficiency of random access of the UE.

Embodiment three

The embodiment of the present invention provides a random access method, which is similar to the method provided in the second embodiment, the difference is that in the second embodiment, the specific method of increasing the power of the UE when accessing the commonE-DCH is not specified , but in this embodiment, when the UE accesses the commonE-DCH, the power of each increase is regular, and the value of each power increase is the same. Therefore, when the UE fails to access the commonE-DCH and falls back to PRACH access, the UE can only judge whether the number of climbs is greater than the threshold number (for example, the threshold number is m). When accessing, the preamble is generated with the transmit power corresponding to the threshold number of times, so as to avoid the UE from interfering with other users when accessing the PRACH.

As shown in Figure 3, the method is described below.

301. The UE sends a preamble to the network side device when accessing the commonE-DCH.

302. After sending the preamble, after waiting for a set time, if the UE does not receive ACK or NACK on the AICH, send the preamble to the network side device with the increased transmission power; the increased transmission power is based on the current transmission of the preamble determined by the number of times. That is, the following calculation results can represent the transmit power of the current preamble, namely:

Preamble_Initial_Power+P0*Z

Among them, Preamble_Initial_Power is the initial transmit power of the UE when it accesses the commonE-DCH, Z is the number of times the power of the UE is increased when it is accessed by the commonE-DCH, and P0 is the increase value of the transmit power for each increase, that is, the step size of the power increase .

303. The UE receives a NACK message sent by the network side device on the AICH.

304. The UE judges whether the number of times the current preamble is sent is greater than the threshold number of times. If it is greater than the threshold number of times, perform 305 to send the preamble on the PRACH with the transmission power corresponding to the threshold number of times, that is, initiate PRACH access with power: (Preamble_Initial_Power+P0*m).

If in 304 the UE determines that the number of times the preamble is sent is not greater than the threshold number, execute 306 to send the preamble on the PRACH with the transmission power corresponding to the current number of times the preamble is sent, that is (Preamble_Initial_Power+P0*Z), and initiate PRACH access.

It should also be understood that the threshold times can be predefined or configurable. The effect of the transmission power corresponding to the threshold number of times makes the power of sending the preamble not exceed the corresponding transmission power when the UE falls back to PRACH access, reducing the interference caused by the UE to other users in the cell.

In a random access method provided by an embodiment of the present invention, when the UE returns to PRACH access after the commonE-DCH access fails, it first judges whether the number of times the preamble is sent is greater than the threshold number when the commonE-DCH access fails, and if If the number of times is greater than the threshold number, the preamble is sent on the PRACH with the transmission power corresponding to the threshold number of times. It can reduce the UE's interference to other users in the cell.

Embodiment Four

The embodiment of the present invention provides a random access method, which is mainly applied to UEs supporting PRACH access, and may also be applied to UEs accessing commonE-DCH. As shown in Figure 4, the method is described below.

401 Receive random backoff parameter information sent by the network device.

Wherein, the network device may be a base station or a radio network controller (RNC), and the random backoff parameter information may specifically be a dynamic persistence level value, or a mapping table between a service type and a random backoff factor N; or It is a mapping table of logical channel priority and random backoff factor; or a mapping table of access level or access service level and random backoff factor.

402. Determine an expiration time of a random backoff timer TB01 according to the random backoff parameter information.

403. During the public enhanced dedicated channel or physical random access channel, a negative acknowledgment indication is detected on the acquisition indication channel.

404. Start the random backoff timer.

405. Execute persistence check after the random backoff timer expires.

406. Initiate random access on the public enhanced dedicated channel or physical random access channel after the persistence check is passed.

In the random access method provided by the embodiment of this aspect, the random back-off timer TB01 is started after the deadline of the random back-off timer is determined according to the random back-off parameter, and the deadline of the timer TB01 can be determined according to different The network environment and service type can be dynamically adjusted. When the timer TB01 expires, the persistence check process is re-executed; after the persistence check is passed, the physical layer random access process is entered. This method can adjust the cut-off time of the random back-off timer TB01 according to the specific status or business conditions of the UE, which overcomes the fact that in the prior art, it cannot be updated in time according to the load or network interference, which may cause the UE to still need to Backoff for a long time increases the problem of access delay.

Embodiment five

The embodiment of the present invention provides a random access method, which is mainly applied to UEs supporting PRACH access, and may also be applied to UEs accessing commonE-DCH. When UE accesses PRACH, it receives NACK on AICH (NACKINAICH), indicating that the network side is currently very busy, and exits the current physical layer random access. However, in order to improve the success rate of random access, the random access process It usually includes two parts: media access layer cycle (MACcycle) and physical layer random access climbing. Execute physical layer random access climbing to the maximum number of times and have not received ACK or NACKinAICH, or received NACK on AICH, then exit the physical layer random access process; if the current number of random access MAC cycles does not reach the upper limit, the UE has the opportunity to re-initiate random access. Specifically, it can add 1 to the number of MAC cycles and re-initiate random access until the number of MAC cycles reaches The maximum value, if ACKinAICH has not been detected, it is considered that the random access has failed.

When the UE detects NACKinAICH when accessing the PRACH, it exits the random access process at the physical layer. If the number of random access cycles at the MAC layer does not reach the configured maximum value, the UE performs a random access method provided by an embodiment of the present invention. , that is, start the random fallback timer TB01 after the expiration of the persistence check timer T2, where the expiration time of the timer TB01 can be dynamically adjusted according to different network environments and service types, and when the timer TB01 expires, re-execute the persistence Checking process; after the persistence check is passed, it enters the random access process of the physical layer. This overcomes the problem that the value of timer TB01 in the prior art is a random number generated randomly by [NB01min, NB01max]. The range [NB01min, NB01max] is configured through SIB5, and generally cannot be updated in time according to load or network interference. As a result, the UE still needs to back off for a long time when the load is light, which increases the problem of access delay.

The following is the specific operation description of the embodiment of this aspect, as shown in Fig. 5a, the method is as follows.

501. Receive random backoff parameter information sent by a network device.

Wherein, the network device may be a base station or a radio network controller (RNC).

502. Determine an expiration time of a random backoff timer according to the received random backoff parameter information.

503. The UE detects a negative acknowledgment indication (NACK) on an acquisition indication channel when receiving a public enhanced dedicated channel or a physical random access channel.

Optionally, 500 may also be included before 503, and the UE performs persistence check before random access. In order to facilitate the distinction, this persistence check can be called "the first persistence check". After the persistence check is passed, the persistence check timer T2 is started, and the random access process is initiated at the same time; the UE detects the current commonE-DCH access Or the PRACH access receives a NACK indication, that is, the UE performs 503 .

Preferably, if a NACK indication is received during the current commonE-DCH access or PRACH access, perform 504 to determine whether the number of MAC random access cycles reaches the configured maximum value, and if it does not reach the configured maximum value, then perform 505, the UE A random fallback will be performed.

Among them, in 505, the UE will perform specific operations of random backoff, as shown in FIG. 5b , specifically including: A01 starts the random backoff timer TB01;

Among them, the persistence check timer T2 is used to control the interval between two consecutive persistence checks, and the value of T2 is usually 10ms. The figures given in the embodiments of the present invention should not be understood as limitations to the embodiments of the present invention, and It is only an example for easy understanding of the embodiments of the present invention. The persistence check can be that the UE generates a random number between [0,1]. If the random number is less than the persistence value configured on the network side, the persistence check is considered to pass, otherwise the persistence check is considered to be failed, and the timer T2 is waited. After 10ms, and after waiting for the time in the timer TB01, execute the persistence check.

The expiration time of the random backoff timer TB01 determined in 502 may specifically be that the UE receives the random backoff parameter information sent by the network side device and determines the expiration time of the TB01.

Wherein, the UE receives the random backoff parameter information sent by the network side device. Specifically, the UE may read the information in the SIB7 in real time, so as to obtain configuration parameters related to the timer TB01. The random fallback parameter information may specifically be: dynamic persistence level (for example, the dynamic persistence level is 8 levels from 1 to 8, that is, the dynamic persistence level is [1, 2, 3, 4, 5, 6, 7 ,8]); or, the random backoff parameter information is a mapping table of service type and random backoff factor; or, the random backoff parameter information is a mapping table of logical channel priority and random backoff factor; or The random backoff parameter information is a mapping table of access class AC or access service class and random backoff factor.

Preferably, when the random backoff parameter information is a mapping table of service types and random backoff factors.

In 502, the deadline of the random back-off timer is determined according to the random back-off parameter, which specifically includes: determining the service type that the user terminal triggers random access, and the service type is a session call, a streaming media call, and an interactive call. Call, and background call, at least one of common control channel (CCCH, CommonControlChannel), dedicated control channel (DCCH, DedicatedControlChannel), dedicated traffic channel (DTCH, DedicatedTrafficChannel); trigger random access service according to the user terminal The type determines the expiration time of the random backoff timer from the mapping table.

Preferably, the random backoff parameter information is a mapping table of logical channel priority and random backoff factor N.

In 502, determining the expiration time of the random backoff timer according to the random backoff parameter specifically includes: determining the logical channel priority corresponding to the service triggering the random access by the user terminal; The logical channel priority corresponding to the service type determines the expiration time of the random backoff timer from the mapping table.

For example: when the UE is in the IDLE state, or the CELL_PCH state, or the URA_PCH state, or the CELL_FACH state, the random access triggered by any of the states is triggered for the circuit switched (CS, CircuitSwitched) service and the packet switched (PS, PacketSwitched) service The random access of the timer corresponds to a different timer TB01 expansion factor N, where the expansion factor N is called a random fallback expansion factor, and the corresponding relationship between the CS or PS service and the TB01 expansion factor is predefined or configurable. Therefore, the UE obtains the random back-off spreading factor according to the service type that triggers the random access and the mapping relationship between the service type and the random back-off spreading factor, so as to further determine the random back-off time.

When the UE is in the IDLE state, or the CELL_PCH state, or the URA_PCH state, or the CELL_FACH state, random access triggered by any of the states, for conversational calls (ConversationalCall), streaming media calls (StreamingCall), interactive calls (InteractiveCall) , background call (BackgroundCall), etc. correspond to different TB01 expansion factors N, that is, the random fallback expansion factor N, and the corresponding relationship between the service type and the timer TB01 expansion factor is predefined or configurable. Therefore, the UE obtains the random back-off spreading factor according to the service type that triggers the random access and the mapping relationship between the service type and the random back-off spreading factor, so as to further determine the random back-off time.

When the UE is in the CELL_FACH state, the priority of different logical channels can correspond to different TB01 expansion factors N, where the logical channel priority (or logical channel type, such as CCCH, DCCH, DTCH) and the timer TB01 expansion factor The correspondences are either predefined or configurable. Therefore, the UE obtains the random back-off spreading factor according to the logical channel priority that triggers the random access and the mapping relationship between the logical channel priority and the random back-off spreading factor, so as to further determine the random back-off time.

When the UE is the calling party or the called party, it may correspond to different TB01 expansion factors, wherein the correspondence between the calling party or the called party and the TB01 expansion factor is predefined or configurable. Therefore, when the UE knows the current calling or being called, it can obtain the corresponding random fallback spreading factor according to the stored correspondence between the calling or called and the TB01 spreading factor.

When the random backoff parameter information is the mapping table of access class (AC) and random backoff factor N, or the random backoff parameter information is the mapping table of access service class (ASC) and random backoff factor N, initiate The random access user terminal determines the corresponding random back-off factor according to the access class or access service class to which it belongs and the mapping table. It should be understood that for different access terminals, the terminals themselves have corresponding access levels. For example, the access levels for ordinary users can be divided into levels from 0 to 9. For government departments and fire department For user terminals in the medical and medical sector, their access levels can be divided into 10th to 15th levels, and the higher the level, the higher the priority. The terminal determines the corresponding random back-off factor according to the access level it belongs to and the mapping table between the access level AC and the random back-off factor N. The user terminal with a higher access level will have relatively less random back-off time, which is convenient Access in time. There is a mapping relationship between the access service class (ASC) and the access class (AC). For example, 0 to 9 in AC are mapped to 2 in ASC, 11 in AC is mapped to 1 in ASC, and so on.

The UE obtains configuration parameters related to the timer TB01, which may specifically be the expansion factor of the timer TB01 described above, and obtains the expiration time of the timer TB01 according to the expansion factor of the timer TB01. The specific operations include: when the UE initially camps in the cell, it reads the set value in the system information (specifically, SIB5) about the range of the expiration time of the timer TB01, that is, [NB01min, NB01max]; when the UE obtains the timer After the expansion factor N of the timer TB01, the range of the expiration time of the timer TB01 is recalculated in the UE, which can be [NB01min, NB01max=10*2N], that is, the minimum value of the range remains unchanged, and it is still NB01min, and the maximum range The value (NB01max) changes to 10*2N; UE randomly selects a number in the range [NB01min, NB01max=10*2N] as the expiration time of timer TB01, where N is the random backoff factor, or N is the dynamic Persistence level value; or, when the UE initially camps in the cell, it reads the setting value of the range of the expiration time of the timer TB01 in the system message (specifically, SIB5), that is, [NB01min, NB01max]; Randomly select a value in the range [NB01min, NB01max]; multiply this value by 2N, and the multiplied result is used as the deadline for timer TB01, where N is the random fallback factor, or N is the dynamic persistence level value ; Or, according to the range of the deadline of timer TB01 obtained from the read system message (specifically, it can be SIB5), keep the maximum value of the range unchanged, and set the minimum value of the range to 10*2N, within the new range A number is randomly selected as the deadline of the timer TB01, where N is a random backoff factor, where N is a random backoff factor, or N is the dynamic persistence level value.

A02, after the random backoff timer TB01 expires, perform persistence check;

After performing 505 waiting time randomization, the UE performs 506, and performs PRACH access or commonE-DCH access again after the persistence check succeeds. Specifically, after the random backoff timer TBO1 expires, a persistence check is performed, and after the persistence check passes, the UE sends a preamble (preamble) again on the PRACH or the commonE-DCH.

In the random access method provided by the embodiment of this aspect, the random back-off timer TB01 is started after the deadline of the random back-off timer is determined according to the random back-off parameter, and the deadline of the timer TB01 can be determined according to different The network environment and service type can be dynamically adjusted. When the timer TB01 expires, the persistence check process is re-executed; after the persistence check is passed, the physical layer random access process is entered. This method can adjust the cut-off time of the random back-off timer TB01 according to the specific status or business conditions of the UE, which overcomes the fact that in the prior art, it cannot be updated in time according to the load or network interference, which may cause the UE to still need to Backoff for a long time increases the problem of access delay.

Embodiment six

An embodiment of the present invention provides a random access device. The random access device may be a UE. As shown in FIG.

The detecting unit 601 is configured to detect an indication of falling back to a physical random access channel when the public enhanced dedicated channel is accessed.

The first judging unit 602 is configured to judge whether the transmit power parameter of the last access to send preamble on the public enhanced dedicated channel is greater than a threshold parameter.

The sending unit 603 is configured to send the preamble on the physical random access channel with the power corresponding to the threshold parameter if the last transmission power parameter for sending the preamble on the public enhanced dedicated channel access is greater than the threshold parameter.

In a random access device provided by an embodiment of the present invention, when the UE fails to access the commonE-DCH and returns to the PRACH access, it first judges whether the transmission power of the last preamble sent during the commonE-DCH access is greater than the threshold power , if it is greater than the threshold power, the preamble is sent on the PRACH with the threshold power. It can reduce the UE's interference to other users in the cell.

Preferably, when the transmit power parameter is transmit power.

The first judging unit 602 is specifically configured to judge whether the transmission power of the last public enhanced dedicated channel access transmission preamble is greater than the threshold power.

The sending unit 603 is specifically configured to send the preamble on the physical random access channel with the threshold power if the last transmission power of the preamble sent on the public enhanced dedicated channel access is greater than the threshold power.

Preferably, the sending unit 603 is further configured to: if the last time the transmission power of the preamble is not greater than the threshold power when accessing the public enhanced dedicated channel, use the transmission power of the last public enhanced dedicated channel to send the preamble in the physical random The access channel sends the preamble.

After commonE-DCH access fails, when the UE returns to PRACH access, it can first judge whether the transmission power of the last preamble sent during commonE-DCH access is greater than the threshold power. Send the preamble. It can reduce the UE's interference to other users in the cell.

Preferably, when the transmit power parameter is the number of times the preamble is sent.

The first judging unit 602 is specifically configured to judge whether the last number of times to access and send the preamble on the public enhanced dedicated channel is the Zth time, and whether it is greater than the threshold number of times M.

The sending unit 603 is specifically configured to send the preamble on the physical random access channel with the power corresponding to the threshold number of times if the last number of times to send the preamble on the public enhanced dedicated channel is the Zth time, which is greater than M.

Preferably, the sending unit 602 is also used to determine that the last number of times the preamble was sent during the public enhanced dedicated channel access is the Zth time, which is not greater than the threshold number M, and the last time the preamble is sent during the public enhanced dedicated channel access The transmit power transmits the preamble on the physical random access channel.

When the UE returns to PRACH access after the commonE-DCH access fails, it can first judge whether the number of preamble transmissions is greater than the threshold number when the commonE-DCH access fails. If it is greater than the threshold number of times, the transmit power corresponding to the threshold number of times The preamble is sent on PRACH. It can reduce the UE's interference to other users in the cell.

Preferably, as shown in FIG. 6 b , the detection unit 601 includes: a sending preamble unit 6011 , a sending ramp-up power unit 6012 , and a receiving unit 6013 .

The sending preamble unit 6011 is configured to send a preamble to the network side device when the public enhanced dedicated channel is accessed.

The sending ramp-up power unit 6012 is configured to send the preamble to the network side device with the ramped-up transmit power when neither a positive acknowledgment indication nor a negative acknowledgment indication is detected on the AICH channel.

The receiving unit 6013 is configured to fall back to physical random access channel access after receiving a negative acknowledgment (NACK) sent by the network side device on the acquisition indication channel.

Embodiment seven

An embodiment of the present invention provides a random access device. The random access device may be a UE. As shown in FIG. 703 , start unit 704 , persistence detection unit 705 , and access unit 706 .

The first receiving unit 701 is configured to receive random backoff parameter information sent by the network device. Wherein, the network device may be a base station or a radio network controller (RNC).

The acquiring expiration time unit 702 is configured to determine an expiration time of the random backoff timer according to the random backoff parameter information.

The first detection unit 703 is configured to detect a negative acknowledgment indication on the acquisition indication channel when the public enhanced dedicated channel or the physical random access channel is used.

The starting unit 704 is configured to start the random backoff timer.

The persistence detection unit 705 is configured to perform a persistence check after the random backoff timer expires.

The access unit 706 is configured to initiate random access on a public enhanced dedicated channel or a physical random access channel after the persistence check is passed.

In the random access device provided in the embodiment of this aspect, after determining the expiration time of the random backoff timer according to the random backoff parameter, the random backoff timer TB01 is started, and the expiration time of the timer TB01 can be determined according to different The network environment and service type can be dynamically adjusted. When the timer TB01 expires, the persistence check process is re-executed; after the persistence check is passed, the physical layer random access process is entered. This method can adjust the cut-off time of the random back-off timer TB01 according to the specific status or business conditions of the UE, which overcomes the fact that in the prior art, it cannot be updated in time according to the load or network interference, which may cause the UE to still need to Backoff for a long time increases the problem of access delay.

Preferably, the random rollback parameter information is specifically a dynamic persistence level value.

Preferably, the random backoff parameter information is a mapping table of service types and random backoff factors.

The acquisition deadline unit 702 is specifically used to determine the type of service that the user terminal triggers random access, the service type is conversational call, streaming media call, interactive call, and background call, common control channel (CCCH, At least one of CommonControlChannel), dedicated control channel (DCCH, DedicatedControlChannel), dedicated traffic channel (DTCH, DedicatedTrafficChannel); according to the service type that the user terminal triggers random access, determine the random backoff timer from the mapping table cutoff time.

Preferably, the random backoff parameter information is a mapping table of logical channel priority and random backoff factor.

The acquisition deadline unit 702 is specifically used to determine the logical channel priority corresponding to the service that the user terminal triggers random access; according to the logical channel priority corresponding to the service type that the user terminal triggers random access, from the mapping The expiration time of the random backoff timer is determined in the table.

Preferably, when the random backoff parameter information is a mapping table of access level or access service level and random backoff factor.

The acquisition deadline unit is specifically configured to determine the deadline of the random backoff timer from the mapping table according to the access level or access service level of the user terminal.

Preferably, the acquisition deadline unit 702 is specifically configured to randomly generate a value within the range according to the range of the deadline of the timer TB01 obtained in the system message, multiply the number by 2 ^N , and multiply The result is used as the expiration time of timer TB01, wherein, N is a random backoff factor, or N is the dynamic persistence level value; or, it is specifically used for the expiration time of timer TB01 obtained from the read system message range, keep the minimum value of the range unchanged, and set the maximum value of the range to 10*2 ^N , randomly select a number in the new range as the deadline of timer TB01, where N is the random back-off factor, or N is the dynamic persistence level value; or, it is specifically used to set the maximum value of the range unchanged and the minimum value of the range to 10*2 ^N according to the range of the expiration time of the timer TB01 obtained in the read system message , randomly select a number within the new range as the deadline of the timer TB01, where N is a random backoff factor, or N is the dynamic persistence level value.

Embodiment seven

An embodiment of the present invention provides a random access device. As shown in FIG. 8 , the device includes: a processor 801 and a transmitter 802;

The processor 801 is configured to detect an indication of falling back to a physical random access channel when the public enhanced dedicated channel is accessed; and is used to determine whether the transmit power parameter of the preamble sent during the last access to the public enhanced dedicated channel is greater than the threshold parameter,

The transmitter 802 is configured to transmit the preamble on the physical random access channel with the power corresponding to the threshold parameter if the last transmission power parameter of the preamble sent on the public enhanced dedicated channel access is greater than the threshold parameter.

Preferably, the transmit power parameter is transmit power;

The processor 801 is specifically configured to determine whether the transmit power of the preamble sent during the last public enhanced dedicated channel access is greater than the threshold power;

The transmitter 802 is specifically configured to send the preamble on the physical random access channel with the threshold power if the last transmission power of the preamble sent on the public enhanced dedicated channel access is greater than the threshold power.

Preferably, the transmitter 802 is further configured to: if the transmit power of the preamble sent during the last access to the public enhanced dedicated channel is not greater than the threshold power, the transmit power of the preamble sent during the last access to the public enhanced dedicated channel is The physical random access channel sends the preamble.

Preferably, the transmit power parameter is the number of times the preamble is sent,

The processor 801 is specifically configured to determine whether the last number of times the preamble is sent in the public enhanced dedicated channel access is the Zth time, and whether it is greater than the threshold number of times M;

The transmitter 802 is specifically configured to send the preamble on the physical random access channel with the power corresponding to the threshold number of times if the last number of times to send the preamble on the public enhanced dedicated channel is the Zth time, which is greater than M.

Preferably, the transmitter 801 is also used to determine that the last number of times the preamble was sent on the public enhanced dedicated channel access is the Zth time, which is not greater than the threshold number M, and the last time the preamble is sent on the public enhanced dedicated channel Preamble transmit power The preamble is sent on the physical random access channel.

Preferably, the transmitter 802 is also configured to send a preamble to the network side device when the public enhanced dedicated channel is accessed;

The processor 801 is further configured to send the preamble to the network side device with the increased transmit power when neither a positive acknowledgment indication nor a negative acknowledgment indication is detected on the AICH channel;

The random access apparatus further includes: a receiver 803, configured to fall back to physical random access channel access after receiving a negative acknowledgment (NACK) sent by the network side device on the acquisition indication channel.

In a random access device provided by an embodiment of the present invention, when the UE fails to access the commonE-DCH and returns to the PRACH access, it first judges whether the transmission power of the last preamble sent during the commonE-DCH access is greater than the threshold power , if it is greater than the threshold power, the preamble is sent on the PRACH with the threshold power. It can reduce the UE's interference to other users in the cell.

Embodiment nine

An embodiment of the present invention provides a random access device, as shown in FIG. 9 , the device includes;

Receiver 901, configured to receive random backoff parameter information sent by the network device;

The processor 902 is configured to determine the expiration time of the random backoff timer according to the random backoff parameter information; and is used to detect a negative acknowledgment indication on the acquisition indication channel when the public enhanced dedicated channel or the physical random access channel ; used to start the random back-off timer; used to perform a persistence check after the random back-off timer expires; used to initiate a random access.

Preferably, the random rollback parameter information is specifically a dynamic persistence level value.

Preferably, the random backoff parameter information is a mapping table of service types and random backoff factors;

The processor 902 is further configured to determine the service type that triggers the random access of the user terminal; determine the expiration time of the random backoff timer from the mapping table according to the service type that triggers the random access of the user terminal

Preferably, the random backoff parameter information is a mapping table of logical channel priority and random backoff factor;

The processor 902 is further configured to determine the logical channel priority corresponding to the service that the user terminal triggers random access; according to the logical channel priority corresponding to the service type that the user terminal triggers random access, from the mapping The expiration time of the random backoff timer is determined in the table.

Preferably, the random backoff parameter information is a mapping table of access level or access service level and random backoff factor;

The processor 902 is further configured to determine the expiration time of the random backoff timer from the mapping table according to the access class or access service class of the user terminal.

Preferably, the processor 902 is further configured to randomly generate a value within the range according to the range of the expiration time of the timer TB01 obtained in the system message, multiply the number by 2N, and the result of the multiplication is As the expiration time of timer TB01, wherein, N is a random rollback factor, or N is the dynamic persistence level value;

Or, it is also used to keep the minimum value of the range unchanged and the maximum value of the range to 10*2 ^N according to the range of the timer TB01 expiration time obtained from the read system message, and randomly select one in the new range Number, as the deadline of timer TB01, wherein, N is a random rollback factor, or N is the dynamic persistence level value;

Or, it is also used to keep the maximum value of the range unchanged and the minimum value of the range to 10*2 ^N according to the range of the deadline of timer TB01 obtained from the read system message, and randomly select one in the new range The number is used as the expiration time of the timer TB01, wherein, N is a random backoff factor, or N is the dynamic persistence level value.

In the random access device provided in the embodiment of this aspect, after determining the expiration time of the random backoff timer according to the random backoff parameter, the random backoff timer TB01 is started, and the expiration time of the timer TB01 can be determined according to different The network environment and service type can be dynamically adjusted. When the timer TB01 expires, the persistence check process is re-executed; after the persistence check is passed, the physical layer random access process is entered. This method can adjust the cut-off time of the random back-off timer TB01 according to the specific status or business conditions of the UE, which overcomes the fact that in the prior art, it cannot be updated in time according to the load or network interference, which may cause the UE to still need to Backoff for a long time increases the problem of access delay.

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to needs. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the above-described system, device, and unit, reference may be made to the corresponding process in the foregoing method embodiments, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be Incorporation may either be integrated into another system, or some features may be omitted, 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. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk, and other media that can store program codes.

As mentioned above, the above embodiments are only used to introduce the technical solutions of the present application in detail, but the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention, and should not be construed as limiting the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention.

Claims (36)

1. the method for a Stochastic accessing, it is characterised in that described method includes:

The instruction returning back to Physical Random Access Channel is detected when public enhancing dedicated channel accesses；

Judge that whether last access in described public enhancing dedicated channel sends leading transmitting power parameter more than threshold parameter,

If described last access in described public enhancing dedicated channel sends leading transmitting power parameter more than threshold parameter, send leading with the power that described threshold parameter is corresponding at Physical Random Access Channel.

2. method according to claim 1, it is characterized in that, described transmitting power parameter is transmitting power, described judgement accesses in public enhancing dedicated channel for the last time and whether sends leading transmitting power parameter more than threshold parameter, if last access in public enhancing dedicated channel sends leading transmitting power parameter more than threshold parameter, send leading with the power that described threshold parameter is corresponding at Physical Random Access Channel, specifically include:

Judge that whether last access in public enhancing dedicated channel sends leading transmitting power more than threshold power,

If last access in public enhancing dedicated channel sends leading transmitting power more than threshold power, send leading with described threshold power at Physical Random Access Channel.

3. method according to claim 2, it is characterised in that described method also includes:

If accessing the leading transmitting power of transmission in public enhancing dedicated channel to be for the last time not more than threshold power, send leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

4. method according to claim 1, it is characterised in that described transmitting power parameter is send leading number of times,

Described judgement accesses in public enhancing dedicated channel for the last time and whether sends leading transmitting power parameter more than threshold parameter, if last access in public enhancing dedicated channel sends leading transmitting power parameter more than threshold parameter, send leading specifically including with the power that described threshold parameter is corresponding at Physical Random Access Channel:

Judge that last is the Z time at the public enhancing dedicated channel access leading number of times of transmission, if more than threshold number M, if it does, send leading with the power that described threshold number is corresponding at Physical Random Access Channel.

5. method according to claim 4, it is characterised in that described method also includes:

It is the Z time that judgement accesses the leading number of times of transmission in public enhancing dedicated channel for the last time, is not more than threshold number M, sends leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

6. the method according to any one of claim 2 or 4, it is characterised in that described detect that the instruction returning back to Physical Random Access Channel includes when public enhancing dedicated channel accesses:

When public enhancing dedicated channel accesses, send leading to network equipment；

When AICH channel being both not detected by just confirm to indicate also without detection negative acknowledgment instruction,

Send leading to network equipment with the transmitting power after soaring；

Receive network equipment and obtaining the negative acknowledgment (NACK) catching instruction channel transmission, then return back to Physical Random Access Channel and access.

7. an accidental access device, it is characterised in that described device includes: detection unit, the first judging unit, and transmitting element；

Described detection unit, for detecting, when public enhancing dedicated channel accesses, the instruction returning back to Physical Random Access Channel；

Described first judging unit, for judging that whether the last transmitting power parameter leading in the access transmission of described public enhancing dedicated channel be more than threshold parameter,

Described transmitting element, if for the described last transmitting power parameter leading in the access transmission of described public enhancing dedicated channel more than threshold parameter, sending leading with the power that described threshold parameter is corresponding at Physical Random Access Channel.

8. device according to claim 7, it is characterised in that described transmitting power parameter is transmitting power；

Described first judging unit, specifically for judging that whether the last transmitting power leading in the access transmission of public enhancing dedicated channel be more than threshold power；

Described transmitting element, if accessing the leading transmitting power of transmission more than threshold power specifically for last in public enhancing dedicated channel, sends leading with described threshold power at Physical Random Access Channel.

9. device according to claim 8, it is characterised in that

Described transmitting element, if being additionally operable to access the leading transmitting power of transmission in public enhancing dedicated channel to be for the last time not more than threshold power, send leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

10. device according to claim 7, it is characterised in that described transmitting power parameter is send leading number of times,

Described first judging unit, specifically for judging that accessing the leading number of times of transmission in public enhancing dedicated channel for the last time is the Z time, if more than threshold number M；

Described transmitting element, if being the Z time specifically for accessing the leading number of times of transmission in public enhancing dedicated channel for the last time, more than M, sends leading with the power that described threshold number is corresponding at Physical Random Access Channel.

11. device according to claim 10, it is characterised in that

Described transmitting element, it is additionally operable to judge that last is the Z time at the public enhancing dedicated channel access leading number of times of transmission, it is not more than threshold number M, sends leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

12. the device described according to Claim 8 or 10 any one, it is characterised in that described detection unit includes: send pilot unit, send power ramp unit, and receive unit；

Described transmission pilot unit, for when public enhancing dedicated channel accesses, sending leading to network equipment；

Described transmission power ramp unit, during for being both not detected by just confirming to indicate also without detection negative acknowledgment instruction on AICH channel, sends leading to network equipment with the transmitting power after soaring；

Described reception unit, is obtaining, for receiving network equipment, the negative acknowledgment (NACK) catching instruction channel transmission, is then returning back to Physical Random Access Channel and access.

13. an accidental access method, it is characterised in that described method includes:

Receive the random back parameter information that the network equipment sends；

The deadline of random back intervalometer is determined according to described random back parameter information；

When public enhancing dedicated channel or Physical Random Access Channel, obtaining to catch, instruction channel detects that negative acknowledgment indicates；

Start described random back intervalometer；

After the cut-off of described random back intervalometer, perform degree of adhering to inspection；

Degree of adhering to inspection, by rear, initiates Stochastic accessing in public enhancing dedicated channel or Physical Random Access Channel.

14. method according to claim 13, it is characterised in that described random back parameter information is specially dynamically degree of adhering to grade point.

15. method according to claim 13, it is characterised in that described random back parameter information is type of service and the mapping table of the random back factor；

The described deadline determining random back intervalometer according to described random back parameter, including:

Determine that described user terminal triggers the type of service of Stochastic accessing；

Type of service according to described user terminal triggering Stochastic accessing determines the deadline of random back intervalometer from described mapping table.

16. method according to claim 13, it is characterised in that described random back parameter information is priority of logical channels and the mapping table of the random back factor；

The described deadline determining random back intervalometer according to described random back parameter, including:

Determine the priority of logical channels that the business of described user terminal triggering Stochastic accessing is corresponding；

Trigger the priority of logical channels corresponding to type of service of Stochastic accessing according to described user terminal, from described mapping table, determine the deadline of random back intervalometer.

17. method according to claim 13, it is characterised in that described random back parameter information is access grade and the mapping table of the random back factor, or, described random back parameter information is access service grade and the mapping table of the random back factor；

From described mapping table, the deadline of random back intervalometer is determined according to the described access grade according to described user terminal or access service grade.

18. method according to any one in claim 14 to 17, it is characterised in that the described deadline determining random back intervalometer according to described random back parameter, specifically include:

The scope of the deadline according to the intervalometer TB01 obtained in system message, randomly generates a numerical value, by described numeral and 2 in described scope^NBeing multiplied, the result being multiplied is as the deadline of intervalometer TB01, and wherein, N is the described random back factor, or N is described dynamically degree of adhering to grade point；

Or, the scope according to the deadline of the intervalometer TB01 obtained in the system message read, by constant for the minima of scope, the maximum of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the described random back factor, or N be described dynamically adhere to read grade point；

Or, the scope according to the deadline of the intervalometer TB01 obtained in the system message read, by constant for the maximum of scope, the minima of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the random back factor, or N be described dynamically adhere to read grade point.

19. an accidental access device, it is characterised in that described device includes: first receives unit, obtains unit deadline, the first detection unit, start unit, degree of adhering to detection unit, and access unit；

Described first receives unit, for receiving the random back parameter information that the network equipment sends；

Described acquisition unit deadline, for determining the deadline of random back intervalometer according to described random back parameter information；

Described first detection unit, for when public enhancing dedicated channel or Physical Random Access Channel, detecting that negative acknowledgment indicates obtaining to catch on instruction channel；

Described start unit, is used for starting described random back intervalometer；

Described degree of adhering to detection unit, after ending for described random back intervalometer, performs degree of adhering to inspection；

Described access unit, is used for degree of adhering to inspection by rear, initiates Stochastic accessing in public enhancing dedicated channel or Physical Random Access Channel.

20. device according to claim 19, it is characterised in that described random back parameter information is specially dynamically degree of adhering to grade point.

21. device according to claim 19, it is characterised in that described random back parameter information is type of service and the mapping table of the random back factor；

Described acquisition unit deadline, specifically for determining that described user terminal triggers the type of service of Stochastic accessing and determines the deadline of random back intervalometer according to the type of service of described user terminal triggering Stochastic accessing from described mapping table.

22. device according to claim 19, it is characterised in that stating random back parameter information is priority of logical channels and the mapping table of the random back factor；

Described acquisition unit deadline, specifically for determining that described user terminal triggers the priority of logical channels corresponding to business of Stochastic accessing；Trigger the priority of logical channels corresponding to type of service of Stochastic accessing according to described user terminal, from described mapping table, determine the deadline of random back intervalometer.

23. device according to claim 19, it is characterised in that described random back parameter information is access grade and the mapping table of the random back factor, or, described random back parameter information is access service grade and the mapping table of the random back factor；

Described acquisition unit deadline, determines the deadline of random back intervalometer specifically for the access grade according to described user terminal or access service grade from described mapping table.

24. device according to any one in claim 20 to 23, it is characterized in that, described acquisition unit deadline, specifically for the scope of the deadline according to the intervalometer TB01 obtained in system message, a numerical value is randomly generated, by described numeral and 2 in described scope^NBeing multiplied, the result being multiplied is as the deadline of intervalometer TB01, and wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point；

Or, specifically for the scope of the deadline according to the intervalometer TB01 obtained in the system message read, by constant for the minima of scope, the maximum of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point；

Or, specifically for the scope of the deadline according to the intervalometer TB01 obtained in the system message read, by constant for the maximum of scope, the minima of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point.

25. an accidental access device, it is characterised in that including:

Described processor, for detecting, when public enhancing dedicated channel accesses, the instruction returning back to Physical Random Access Channel；For judging that whether the last transmitting power parameter leading in the access transmission of described public enhancing dedicated channel be more than threshold parameter,

Described transmitter, if for the described last transmitting power parameter leading in the access transmission of described public enhancing dedicated channel more than threshold parameter, sending leading with the power that described threshold parameter is corresponding at Physical Random Access Channel.

26. device according to claim 25, it is characterised in that described transmitting power parameter is transmitting power；

Described processor, specifically for judging that whether the last transmitting power leading in the access transmission of public enhancing dedicated channel be more than threshold power；

Described transmitter, if accessing the leading transmitting power of transmission more than threshold power specifically for last in public enhancing dedicated channel, sends leading with described threshold power at Physical Random Access Channel.

27. device according to claim 25, it is characterised in that

Described transmitter, if being additionally operable to access the leading transmitting power of transmission in public enhancing dedicated channel to be for the last time not more than threshold power, send leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

28. device according to claim 25, it is characterised in that described transmitting power parameter is send leading number of times,

Described processor, specifically for judging that accessing the leading number of times of transmission in public enhancing dedicated channel for the last time is the Z time, if more than threshold number M；

Described transmitter, if being the Z time specifically for accessing the leading number of times of transmission in public enhancing dedicated channel for the last time, more than M, sends leading with the power that described threshold number is corresponding at Physical Random Access Channel.

29. device according to claim 28, it is characterised in that

Described transmitter, it is additionally operable to judge that last is the Z time at the public enhancing dedicated channel access leading number of times of transmission, it is not more than threshold number M, sends leading with the described last transmitting power leading in the access transmission of public enhancing dedicated channel at Physical Random Access Channel.

30. according to the device described in any one of claim 26 or 28, it is characterised in that

Described transmitter, is additionally operable to, when public enhancing dedicated channel accesses, send leading to network equipment；

Described processor, when being additionally operable to both be not detected by just confirming to indicate also without detection negative acknowledgment instruction on AICH channel, sends leading to network equipment with the transmitting power after soaring；

Described accidental access device also includes: receptor, is obtaining, for receiving network equipment, the negative acknowledgment (NACK) catching instruction channel transmission, is then returning back to Physical Random Access Channel and access.

31. an accidental access device, it is characterised in that include；

Receptor, for receiving the random back parameter information that the network equipment sends；

Processor, for determining the deadline of random back intervalometer according to described random back parameter information；For when public enhancing dedicated channel or Physical Random Access Channel, instruction channel detecting that negative acknowledgment indicates obtaining to catch；For starting described random back intervalometer；After ending for described random back intervalometer, perform degree of adhering to inspection；For degree of adhering to inspection by rear, initiate Stochastic accessing in public enhancing dedicated channel or Physical Random Access Channel.

32. device according to claim 31, it is characterised in that described random back parameter information is specially dynamically degree of adhering to grade point.

33. device according to claim 31, it is characterised in that described random back parameter information is type of service and the mapping table of the random back factor；

Described processor, is additionally operable to determine the type of service that described user terminal triggers Stochastic accessing；Type of service according to described user terminal triggering Stochastic accessing determines the deadline of random back intervalometer from described mapping table.

34. device according to claim 31, it is characterised in that stating random back parameter information is priority of logical channels and the mapping table of the random back factor；

Described processor, is additionally operable to determine that described user terminal triggers the priority of logical channels that the business of Stochastic accessing is corresponding；Trigger the priority of logical channels corresponding to type of service of Stochastic accessing according to described user terminal, from described mapping table, determine the deadline of random back intervalometer.

35. device according to claim 31, it is characterised in that described random back parameter information is access grade and the mapping table of the random back factor, or, random back parameter information is access service grade and the mapping table of random back factor N；

Described processor, is additionally operable to the access grade according to described user terminal or access service grade, determines the deadline of random back intervalometer from described mapping table.

36. device according to any one in claim 32 to 35, it is characterised in that described processor, it is additionally operable to, according to the scope of the deadline of the intervalometer TB01 of acquisition in system message, in described scope, randomly generate a numerical value, by described numeral and 2^NBeing multiplied, the result being multiplied is as the deadline of intervalometer TB01, and wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point；

Or, it is additionally operable to according to the scope of the deadline of the intervalometer TB01 of acquisition in the system message read, by constant for the minima of scope, the maximum of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point；

Or, it is additionally operable to according to the scope of the deadline of the intervalometer TB01 of acquisition in the system message read, by constant for the maximum of scope, the minima of scope is set to 10*2^N, in this new range, randomly choose a number, as the deadline of intervalometer TB01, wherein, N is the random back factor, or N is described dynamically degree of adhering to grade point.