WO2022082674A1 - Procédé, appareil et système de communication - Google Patents

Procédé, appareil et système de communication Download PDF

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Publication number
WO2022082674A1
WO2022082674A1 PCT/CN2020/123003 CN2020123003W WO2022082674A1 WO 2022082674 A1 WO2022082674 A1 WO 2022082674A1 CN 2020123003 W CN2020123003 W CN 2020123003W WO 2022082674 A1 WO2022082674 A1 WO 2022082674A1
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WIPO (PCT)
Prior art keywords
information
cfra
cbra
msga
access network
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PCT/CN2020/123003
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English (en)
Chinese (zh)
Inventor
吴烨丹
耿婷婷
胡星星
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华为技术有限公司
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Priority to PCT/CN2020/123003 priority Critical patent/WO2022082674A1/fr
Publication of WO2022082674A1 publication Critical patent/WO2022082674A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the present application relates to the field of mobile communication technologies, and in particular, to a communication method, apparatus and system.
  • a terminal device can achieve uplink synchronization through a random access process through a random access channel (RACH).
  • RACH random access channel
  • the random access process may include, for example, Contention based random access (CBRA) and Contention-Free based random access (CFRA); or, Non-Contention based random access (CBRA) random access) in two ways.
  • the random access process can be divided into, for example, four-step random access (4-step RACH) and two-step random access (2-step RACH).
  • the terminal device will record the information in the random access process and generate the corresponding RACH report (report).
  • the terminal device accesses the network, it sends the RACH report to the network device, which is used by the network device to identify the problem in the random access process and optimize the RACH configuration.
  • existing RACH reports cannot support scenarios related to 2-step RACH procedures.
  • the embodiments of the present application provide a communication method, device, and system, which can enable the information reported by the terminal device to support scenarios related to the 2-step RACH process, so that the reported information is more comprehensive, and further, the success of random access can be improved. Rate.
  • a communication method is provided. It can be understood that the method of the first aspect can be performed by a first apparatus, and the first apparatus can be a terminal device or a communication device capable of supporting the functions required by the terminal device to implement the method, such as a chip or a circuit or a chip system.
  • the communication method may include:
  • a first message is received from a first access network device, wherein the first message includes resource configuration information based on two-step non-competitive random access (2-step CFRA) and/or two-step competitive random access Enter (2-step CBRA) resource configuration information; according to the first message, perform random access in the target cell, where the target cell belongs to the second access network device; send a first report, the first The report includes first information including information related to the process of the 2-step CFRA and/or 2-step CBRA.
  • the information reported by the terminal device can support scenarios related to the 2-step RACH process, so that the reporting The information is more comprehensive, and further, the success rate of random access can be improved.
  • a communication method is provided.
  • the method of the second aspect may be performed by a second apparatus, and the second apparatus may be an access network device or a communication device capable of supporting the functions required by the access network device to implement the method, such as a chip or a circuit or a chip system.
  • the communication method may include:
  • the second access network device receives all or part of the information of the first report, wherein all or part of the information of the first report includes information related to the 2-step CFRA and/or 2-step CBRA process, the second The access network device is the access network device corresponding to the first report;
  • the second access network device performs processing according to all or part of the information of the first report.
  • the corresponding information of the scene related to the 2-step RACH process can be obtained, so that the acquired The information is more comprehensive, so that the second access network device can adjust or optimize the corresponding parameters, and the success rate of random access can be improved in the future.
  • a communication method is provided.
  • the method of the third aspect may be performed by a third apparatus, and the third apparatus may be an access network device or a communication device capable of supporting the functions required by the access network device to implement the method, such as a chip or a circuit or a chip system.
  • the communication method may include: the third access network device receives a first report, where the first report includes first information, where the first information includes Information related to the process of 2-step CFRA and/or 2-step CBRA, the third access network device is the access network device described in the cell where the terminal device is currently located; the third access network device will All or part of the first information is sent to the second access network device corresponding to the first information.
  • the information reported by the terminal device can support scenarios related to the 2-step RACH process, so that The reported information is more comprehensive. Further, after receiving the first information, the third access network device sends it to the corresponding access network device, so that the corresponding access network device can adjust or optimize the corresponding parameters. Subsequently, the random access success rate can be improved.
  • the above-mentioned information related to the process of 2-step CFRA and/or 2-step CBRA may include at least one of the following information: 2-step The total number of transmissions of MSGA of CFRA, the total number of transmissions of MSGA of 2-step CBRA, the information of the beam corresponding to MSGA in each 2-step CFRA, the information of the corresponding beam of MSGA in each 2-step CBRA, each time 2-step CFRA failure or success indication information, each 2-step CBRA failure or success indication information, each 2-step CFRA failure time information, each 2-step CBRA failure time information, 2 -Time information when step CFRA is successful, time information when 2-step CBRA is successful, whether the network is configured with 2-step CFRA resource configuration information, whether the terminal device executes 2-step CFRA information, whether the network is configured The resource configuration information of 2-step CFRA but the terminal device does not have the indication information of executing 2-step CFRA, and the indication information of whether the terminal device executes 2-step C
  • the beam information includes at least one of the following: an identifier of the beam, signal quality of the beam, and indication information of whether the signal quality of the beam is higher than a signal quality threshold.
  • the above-mentioned first information may further include: the total number of times of MSGA transmission, the maximum number of transmission times of MSGA, and the signal quality threshold value. , every four steps are based on the identification of the corresponding beam and/or the signal quality of the beam when the preamble is sent in the competitive random access (4-step CBRA), each 4-step CBRA failure or success indication information, 4- The time information when step CBRA succeeds, the time information when each 4-step CBRA fails, the indication information that the network does not configure the resource configuration information of 4-step CFRA, and the total number of MSG3 sending times. It can be understood that, according to different scenarios and/or requirements, the information further included in the first information may be different.
  • the first information further includes a method indicating a fallback from two-step random access to four-step random access. information.
  • the fallback method may be explicit or implicit.
  • a communication device having a function of implementing the behavior in the method of the first aspect above.
  • the functions can be implemented by hardware, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication apparatus includes: a receiving unit for receiving the first message from the first access network device; a processing unit for performing random access on the target cell and generating the first report; and for A sending unit that sends the first report.
  • a communication device having a function of implementing the behavior in the method of the second aspect above.
  • the functions can be implemented by hardware, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device includes: a transceiving unit and a processing unit, wherein the transceiving unit is configured to receive all or part of the information of the first report, the whole or part of the information including the 2-step CFRA and/or the 2-step CBRA process-related information, and the processing unit is used for processing according to all or part of the information.
  • These modules/units can perform the corresponding functions in the method examples of the second aspect. For details, please refer to the detailed descriptions in the method examples, which will not be repeated here.
  • a communication device having a function of implementing the behavior in the method of the third aspect.
  • the functions can be implemented by hardware, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device includes: a transceiver unit and a processing unit.
  • the transceiver unit is configured to receive the first report
  • the processing unit 720 is configured to determine that the received first report corresponds to the second access network device
  • the transceiver unit 710 is further configured to send all or part of the information of the first report to
  • all or part of the information of the first report includes information related to the process of 2-step CFRA and/or 2-step CBRA.
  • a communication apparatus in a seventh aspect, is provided, and the communication apparatus may be a communication apparatus for implementing any one of the communication methods in the above-mentioned first aspect to the third aspect.
  • the communication device includes a processor and a memory. Wherein, the memory is used to store computer programs or instructions or data, and the processor is coupled with the memory and the communication interface, and when the processor reads the computer program or instructions or data, the communication device executes the method of any aspect.
  • the communication interface may be a transceiver in a communication device, for example, implemented by an antenna, a feeder, a codec, etc. in the communication device, or, if the communication device is a chip set in an access network device, the communication The interface may be an input/output interface of the chip, such as input/output pins and the like.
  • the transceiver is used for the communication device to communicate with other devices.
  • an embodiment of the present application provides a chip system, where the chip system includes a processor for implementing any one of the methods in the first aspect to the third aspect.
  • the system-on-a-chip further includes a memory for storing program instructions and/or data.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • an embodiment of the present application provides a communication system, where the system includes one or more of the communication devices of the fourth aspect - the sixth aspect.
  • a computer program product comprising: computer program code, which, when the computer program code is executed, causes any one of the methods in the above-mentioned aspects to be performed.
  • the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed, any of the above-mentioned methods can be implemented.
  • FIG. 1 is a schematic structural diagram of a communication system to which an embodiment of the application is applied;
  • FIG. 2 is an example diagram of a four-step random access process provided by an embodiment of the present application
  • FIG. 3 is an example diagram of a two-step random access process provided by an embodiment of the present application.
  • FIG. 4 is a flowchart of an example of a communication method provided by an embodiment of the present application.
  • FIG. 5 is a flowchart of another example of a communication method provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication apparatus provided by an embodiment of the present application.
  • FIG. 1 is only an example of a communication system
  • the communication system may include at least one terminal device and at least one network device.
  • a terminal device and two network devices are included in FIG. 1 as an example. After the terminal device 1 moves, it is connected to different network devices.
  • the number of terminal devices and network devices in FIG. 1 is only an example, and there may be more terminal devices and network devices in the communication system, and any network device can provide services for the terminal devices within the coverage.
  • the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device, a wearable device, a vehicle-mounted device, or a device built into the above-mentioned device (for example, a communication module or a chip system, etc.).
  • the terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios.
  • user equipment UE
  • access terminal subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in internet of things (IoT) systems, wireless terminals in self-driving, wireless terminals in remote medical , wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone , Session Initiation Protocol (SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or connected to Other processing equipment of wireless modems, in-vehicle equipment, in-vehicle communication devices, in-vehicle communication processing chips, wearable devices, terminal equipment in 5G networks or terminal equipment in the future evolved public land mobile network (PLMN) Wait.
  • PLMN
  • the network device may be an access network device, and the access network device may also be called a radio access network (RAN) device.
  • a device for wireless terminal communication can also be regarded as a device that provides a wireless communication function for the terminal device.
  • Access network equipment includes, but is not limited to, the next generation base station (generation nodeB, gNB), evolved node B (evolved node B, eNB), baseband unit (baseband unit, BBU) in 5G, transmitting and receiving points (transmitting and receiving), for example, but not limited to: point, TRP), transmitting point (transmitting point, TP), the base station in the future mobile communication system or the access point in the WiFi system, etc.
  • the access network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario, or a network
  • the device may be a relay station, a vehicle-mounted device, and a network device in a future evolved PLMN network, and the like.
  • CUs and DUs can be physically separate or deployed together. Multiple DUs can share one CU. A DU can also be connected to multiple CUs. The CU and the DU can be connected through an interface, such as an F1 interface. CU and DU can be divided according to the protocol layer of the wireless network. For example, one of the possible division methods is: CU is used to execute the radio resource control (Radio Resouce Control, RRC) layer, the service data adaptation protocol (service data adaptation protocol, SDAP) layer and the packet data convergence layer protocol (packet data convergence layer protocol).
  • RRC Radio Resouce Control
  • SDAP service data adaptation protocol
  • packet data convergence layer protocol packet data convergence layer protocol
  • Protocol, PDCP protocol layer function
  • DU is used to perform radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer, physical (physical) layer and other functions.
  • RLC radio link control
  • MAC media access control
  • DU physical (physical) layer and other functions.
  • RLC radio link control
  • MAC media access control
  • DU physical (physical) layer and other functions.
  • the functions of the CU or DU may also be divided according to service types or other system requirements. For example, according to the delay, the functions whose processing time needs to meet the delay requirements are set in the DU, and the functions that do not need to meet the delay requirements are set in the CU.
  • the network architecture shown in the figure above can be applied to a 5G communication system, which can also share one or more components or resources with an LTE system.
  • the CU may also have one or more functions of the core network.
  • One or more CUs can be set centrally or separately.
  • the CU can be set on the network side to facilitate centralized management.
  • the DU can have multiple radio functions, or the radio functions can be set farther away.
  • the functions of the CU can be implemented by one entity or by different entities.
  • the functions of the CU can be further segmented, for example, the control plane (CP) and the user plane (UP) can be separated, that is, the CU control plane (CU-CP) and the CU user plane (CU -UP).
  • the CU-CP and the CU-UP may be implemented by different functional entities, and the CU-CP and the CU-UP may be coupled with the DU to jointly complete the functions of the access network device.
  • Terminal equipment can communicate with access network equipment of different technologies. For example, terminal equipment can communicate with access network equipment that supports long term evolution (LTE), and can also communicate with access network equipment that supports 5G. It can communicate with LTE-enabled access network devices and 5G-enabled access network devices at the same time.
  • LTE long term evolution
  • 5G 5th Generation
  • the embodiments of the present application first briefly introduce the four-step random access process and the two-step random access process.
  • the four-step random access procedure may include, for example, the following procedures:
  • the terminal device sends message 1 (MSG 1).
  • the message 1 includes a random access preamble (preamble).
  • the terminal device when a terminal device initiates contention-based four-step random access on a cell, the terminal device can select one of the preambles available in the cell, and transmit the preamble through a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the preamble is specified by the access network equipment.
  • the access network device After receiving the preamble sent by the terminal device, the access network device sends message 2 (MSG 2) to the terminal device.
  • SMSG 2 message 2
  • the message 2 may be called a random access response (random access response, RAR).
  • RAR random access response
  • the terminal device After the terminal device sends the preamble, it will monitor the physical downlink control channel (PDCCH) within the RAR time window (RA response window) to receive the corresponding RAR.
  • PDCCH physical downlink control channel
  • the access network device after the access network device receives the preamble sent by the terminal device, it estimates the transmission delay between the access network device and the terminal device, and calculates the uplink timing advance (TA) according to the transmission delay. So that the access network equipment can calibrate the uplink timing.
  • the access network device may also send the TA to the terminal device, so that the terminal device performs uplink synchronization with the access network device according to the TA.
  • the RAR includes at least one of a preamble identifier, TA information, and initial uplink grant (UL grant) information.
  • the RAR may further include the temporary identifier C-RNTI of the UE.
  • the terminal device After receiving the RAR from the access network device, the terminal device determines whether the preamble indicated by the preamble identifier in the RAR is the same as the preamble sent in step S1. If the same, it is considered that the RAR reception is successful, otherwise, it is considered that the RAR reception fails, and the terminal device can re-trigger the random access procedure.
  • the terminal device does not receive the RAR replied by the access network device within the RAR time window, it is considered that the random access process has failed.
  • the preamble is dedicated to the terminal equipment, so there is no conflict, and because the terminal equipment already has the unique identifier C-RNTI in the access cell, it does not need the access network equipment to assign it. C-RNTI, so S3 and S4 may not be performed.
  • the terminal device sends a message 3 (MSG3) to the base station.
  • MSG3 message 3
  • the MSG3 contains the identification information of the terminal equipment, and the identification information of the terminal equipment can be used for conflict resolution in S4.
  • the identification information of the terminal equipment may be the C-RNTI information of the terminal equipment, the resume ID (resume ID) or the inactive identification (inactive RNTI, I-RNTI) of the terminal equipment, the system architecture evolution temporary mobile user identification (system architecture evolution temporary mobile user identity) Subscriber identity, S-TMSI), any one of random numbers.
  • the resume ID or I-RNTI is used for the access network device to identify the terminal device and related context information, etc.
  • the terminal device may determine a physical uplink shared channel (PUSCH) according to the UL grant information in the RAR, and send data through the PUSCH.
  • Sending data by the terminal device through the PUSCH may be referred to as sending message 3 .
  • PUSCH physical uplink shared channel
  • the data sent by the terminal device through the PUSCH may include at least one of a radio resource control layer (radio resource control, RRC) message and user plane data of the terminal device.
  • RRC radio resource control
  • the access network device sends a message 4 (MSG4) to the terminal device to resolve the conflict.
  • MSG4 message 4
  • the access network device receives the message 3 sent by the terminal device, and can obtain the identification information of the terminal device therefrom.
  • the access network device may send a message 4 to the terminal device, indicating that the terminal device that wins the random access conflict, other terminal devices may re-initiate random access.
  • the message 4 may include a conflict resolution identity (contention resolution identity, CR ID).
  • the CR ID is part or all of the identification information of the terminal device in message 3.
  • the terminal device compares the CR ID with the identification information of the terminal device in the message 3. If the two match, the conflict is resolved successfully. If the terminal device does not receive message 4, the terminal device can re-initiate random access. Or, the CR ID does not match the identification information of the terminal device in message 3, that is, the terminal device fails in conflict resolution, and the terminal device can re-initiate random access.
  • the two-step random access procedure may include the following procedures:
  • the terminal device sends MSGA.
  • MSGA includes two parts: preamble and data sent on the PUSCH corresponding to the preamble
  • the terminal device may only send data on the PUSCH in A1.
  • the terminal device may only send data on the PUSCH in step A1.
  • the data sent by the terminal device through the PUSCH may include at least one of a radio resource control layer (radio resource control, RRC) message, identification information of the terminal device, and user plane data.
  • RRC radio resource control
  • the terminal device receives the resource configuration information related to the two-step random access process sent by the access network device.
  • the resource configuration information may include preamble configuration information and PUSCH configuration information.
  • the configuration information may further include a correspondence between the configuration information of the preamble and the configuration information of the PUSCH.
  • the configuration information of the preamble includes at least one of random access preamble configuration information and/or time-frequency resource configuration information.
  • the random access preamble configuration information is used to determine the random access preamble
  • the time-frequency resource configuration information is used to determine the time-frequency resource for sending the random access preamble.
  • the preamble and the PUSCH may correspond one-to-one, or multiple preambles correspond to one PUSCH, or one preamble corresponds to multiple PUSCHs.
  • the configuration information may include the maximum transmission times of the preamble or MSGA in the two-step random access.
  • the terminal device receives the MSGB from the access network device.
  • the MSGB may include one or more RARs, and the RARs include a success response (successRAR) or a fallback response (fallbackRAR).
  • the MSGB may carry indication information, indicating whether the RAR in the MSGB is success RAR or fallback RAR.
  • SuccessRAR includes conflict resolution identifier.
  • successRAR can indicate that the access network device has detected the preamble sent by the terminal device, and successfully decoded the data sent on the PUSCH corresponding to the preamble. If the conflict is successfully resolved, the terminal device ends the random access procedure, otherwise, the terminal device can re-initiate random access.
  • FallbackRAR can indicate that the access network device detects the preamble, but fails to successfully decode the data sent on the PUSCH corresponding to the preamble, and the terminal device does not win the two-step random access. specifically.
  • the FallbackRAR may include at least one of a preamble identifier, TA information, and initial uplink grant information. After receiving the fallbackRAR, the terminal device falls back to the four-step random access.
  • four-step CFRA can be called 4-step CFRA
  • four-step CBRA can be called 4-step CBRA
  • two-step CFRA can be called 2-step CFRA
  • two-step CBRA can be called 2-step CBRA.
  • the fallback mentioned above refers to fall back from 2-step RACH to 4-step RACH, wherein the fallback can include two types: explicit mechanism and implicit mechanism.
  • the terminal device receives the fallback indication in the MSGB, and the terminal device falls back to the 4-step RACH process, that is, the terminal sends MSG3 after receiving the fallback indication. For example, if the access network device receives the 2-step RACH preamble but cannot solve the corresponding PUSCH, the access network device can instruct the terminal device to roll back from the 2-step RACH to the 4-step RACH through MSGB.
  • the explicit mechanism may also be referred to as a passive mechanism.
  • Implicit mechanism If the terminal device fails to perform 2-step RACH, the terminal device can also actively fallback to 4-step RACH. For example, the terminal device determines that the number of times of sending MSGA has reached the maximum number of MSGA transmissions but has not reached the maximum number of RLF transmissions. If the random access has not been successful, the terminal device will fall back to 4-step RACH. This implicit mechanism may also be referred to as an active mechanism.
  • RLFs radio link failures
  • the handover message (the handover message can be a handover command HO message or an RRC reconfiguration message, etc.) contains the resource configuration information of the 2-step CFRA but does not include the resource configuration information of the 4-step CFRA
  • the 2-step CFRA For the resource configuration information of CFRA, refer to the description of the resource configuration information related to the two-step random access process in the foregoing, for example, including the preamble index (index) associated with the beam, time-frequency resources, and PUSCH resource information.
  • the handover message may also include the first signal quality threshold value (eg X), the maximum number of transmissions of the MSGA, and the maximum number of transmissions of the preamble.
  • the beam with the corresponding 2-step CFRA resource configuration information can be referred to as a beam configured with 2-step CFRA resources.
  • the terminal device If there is a beam with signal quality higher than X and configured with 2-step CFRA resources (for example, beam 1) in the target cell, the terminal device performs 2-step CFRA through this beam 1. If the 2-step CFRA of 1 fails, then the terminal device selects other beams in the target cell whose signal quality is higher than X and is configured with 2-step CFRA resources.
  • 2-step CFRA resources for example, beam 1
  • the total number of transmissions of beams or MSGAs with quality higher than X and configured with 2-step CFRA resources reaches the maximum number of transmissions of MSGA A; further, if there is no other signal quality higher than X in the target cell and configured with 2-step CFRA resources and the total number of times the terminal equipment sends MSGA does not reach the maximum number of MSGA transmissions, the terminal equipment can select a beam with a signal quality higher than X to perform 2-step CBRA until the 2-step CBRA is successful or the target cell There are no more beams with signal quality higher than X or the total number of MSGA transmissions reaches the maximum number of MSGA transmissions; further, if there are no other beams with signal quality higher than X in the target cell, and the terminal equipment sends the total number of MSGA transmissions.
  • the terminal device can randomly select a beam to perform 2-step CBRA until the 2-step CBRA is successful or the total transmission times of MSGA reaches the maximum transmission times of MSGA A; further, if the total transmission times of MSGA When the number of times reaches the maximum number of MSG A transmissions, the terminal device has not successfully completed the random access process with the target cell, but the total number of preamble transmissions has not reached the maximum number of preamble transmissions, then the terminal device falls back to 4-step CBRA.
  • the terminal device can select a beam with signal quality higher than X to perform 2-step CBRA. If the 2-step CBRA between the terminal device and the selected beam whose signal quality is higher than X fails, until the 2-step CBRA succeeds or there are no other beams whose signal quality is higher than X in the target cell or the total number of MSGA transmissions reaches The maximum number of MSGA transmissions; further, if there are no other beams with signal quality higher than X in the target cell, and the total number of times the terminal device sends MSGA does not reach the maximum number of MSGA transmissions, the terminal device can randomly select a beam Carry out 2-step CBRA until the 2-step CBRA is successful or the total number of MSGA transmissions reaches the maximum number of transmissions of MSGA A; further, if the total number of transmissions of MSGA reaches the maximum number of transmissions of MSGA A, the terminal device has not successfully completed and the target The random access process
  • Case 2 If the handover message does not contain the resource configuration information of 2-step CFRA and the resource configuration information of 4-step CFRA, for example, the handover message contains the resource configuration information of 2-step CBRA, the second signal quality threshold (such as Y), the maximum transmission times of MSG A, the maximum transmission times of preamble, etc.
  • the handover message contains the resource configuration information of 2-step CBRA, the second signal quality threshold (such as Y), the maximum transmission times of MSG A, the maximum transmission times of preamble, etc.
  • the terminal device If the cell signal quality of the target cell is higher than Y, the terminal device performs 2-step CBRA until the 2-step CBRA is successful or the total number of MSGA transmissions reaches the maximum number of MSGA A transmissions; further, if the total number of MSGA transmissions When the number of transmissions reaches the maximum number of transmissions of MSGA, the terminal device has not successfully completed the random access process with the target cell, but the total number of preamble transmissions has not reached the maximum number of preamble transmissions, then the terminal device falls back to 4-step CBRA.
  • the terminal device If the signal quality of the cell in the target cell is not higher than Y, the terminal device performs 4-step CBRA.
  • the above is described by taking the terminal equipment in the connected state to perform handover as an example.
  • the terminal equipment in the idle state initiates RRC establishment or the terminal equipment in the inactive state initiates RRC recovery
  • the terminal equipment and the RRC The fallback mechanism from 2-step RACH to 4-step RACH between the established target cell or the target cell for RRC recovery can refer to the above case 2, but the signal quality threshold (Z) may be different from Y, but It may also be the same.
  • the three values of X, Y, and Z may be the same or different, which are not limited in the embodiments of the present application.
  • the signal quality mentioned above can be determined by the received signal code power (received signal code power, RSCP), reference signal receiving power (reference signal receiving power, RSRP), reference signal receiving quality (reference signal receiving quality, RSRQ) ), signal noise ratio (SNR), signal to interference plus noise ratio (SINR), reference signal strength indication (reference signal strength indication, RSSI) or at least one of other signal quality There are corresponding quality thresholds for the characterization quantities of different signal qualities.
  • RSCP received signal code power
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • SNR signal noise ratio
  • SINR signal to interference plus noise ratio
  • RSSI reference signal strength indication
  • the existing RACH report only supports the four-step random access process, and cannot support the two-step random access process, and the scenario where the two-step random access process falls back to the four-step random access process. This makes it impossible for the network side to optimize the random access configuration according to the RACH report, which may cause the terminal device to frequently fall back to the four-step random access process, reducing the success rate of the terminal device's random access.
  • the terminal device will execute the 4-step CFRA.
  • An embodiment of the present application provides a communication method. As shown in FIG. 4 , the method includes the following processes:
  • a terminal device receives a first message from a first access network device.
  • the first message is used for the terminal device to perform random access, and according to the first message, the terminal device can switch to or access the target cell through a random access process.
  • the replacement or access to the target cell may include: accessing the target cell through a process such as cell handover or cell selection, or a terminal device in an idle state initiates RRC re-establishment, or a terminal device in a deactivated state initiates RRC recovery. The embodiment does not limit this.
  • the target cell belongs to the second access network device.
  • the first access network device and the second access network device may be the same access network device, or may be different access network devices.
  • the first access network device and the second access network device may be the same access network device.
  • the first message may be a handover message such as a handover command HO message or an RRC reconfiguration message, or the first message may also be a system message.
  • the content included in the first message may vary according to different scenarios. For details, reference may be made to the description of the handover message above, which will not be repeated here.
  • the message may include resource configuration information of 2-step CBRA, wherein, for the resource configuration information of 2-step CBRA, reference may be made to the related two-step random access procedure in the foregoing embodiment.
  • the description of the resource configuration information will not be repeated here. It can be understood that when an idle state terminal device initiates RRC establishment or an inactive state terminal device initiates RRC recovery, random access can be attempted according to the resource configuration information of the 2-step CBRA in the system message. For example, refer to Case 2 described earlier.
  • the terminal device performs random access on the target cell.
  • the terminal device performs random access on the second access network device according to the first message.
  • the random access performed by the terminal equipment on the target cell may be as follows A process in a-i:
  • the terminal device performs at least one 2-step CFRA, and the final 2-step CFRA is successful.
  • the terminal device performs at least one 2-step CBRA after 2-step CFRA fails, and finally the 2-step CBRA succeeds.
  • the terminal device performs at least one 2-step CBRA, and the final 2-step CBRA succeeds.
  • the terminal device After the 2-step CBRA fails, the terminal device performs at least one 4-step CBRA, and finally the 4-step CBRA succeeds.
  • the terminal device performs at least one 4-step CBRA, and finally the 4-step CBRA is successful.
  • the resource configuration information of 2-step CFRA and the resource configuration information of 4-step CFRA are not included in the first message, at this time, the resource configuration information of 2-step CBRA can be included in the first message, such as the preceding paragraph.
  • the random access performed by the terminal device on the target cell may be one of the above processes e-i.
  • the terminal device sends a first report, where the first report includes the first information.
  • the terminal device will generate and send a first report, where the first report includes first information, wherein the first information includes information related to the process of 2-step CFRA and/or 2-step CBRA information.
  • the terminal device can indicate the occurrence of 2-step CFRA and/or 2-step CBRA respectively, even if the 2-step CFRA and/or 2-step CBRA is not executed in the end, the / or 2-step indication of CBRA related information.
  • the terminal device may send a second message to the second access network device or the third access network device, where the second message includes the above-mentioned first report.
  • the third access network device may be an access network device different from the second access network device.
  • the third access network device and the first access network device may be the same access network device, or may be different access network devices.
  • the second message may be, for example, a user equipment information response message (UE information response) or another message, which is not limited in this embodiment of the present application.
  • the first report may be a report related to random access reported by the terminal device to the second access network device or the third access network device, for example, a RACH report, a setup failure report, a recovery failure report, a radio link Failure report or switch success report.
  • the network device corresponding to the first report is the second access network device, that is to say, the random access involved in the first report occurs at the second access network device.
  • the terminal device will send the second message to the access network device to which the cell where it is currently located, wherein the access network device that the terminal device will send to the current cell to which it belongs may be the second access network device, It may also be a third access network device.
  • the terminal device initiates random access in the cell of the second access network device
  • the terminal device may record random access-related information to generate a first report, and send the first report to the second access network device, so that the second access network device can perform random access.
  • the network access device can optimize the random access configuration parameters of the terminal device according to the information in the first report (for example, the first information), so as to improve the random access success rate.
  • the terminal device may generate the first report at the second access network device, and when the terminal device moves to a cell under a third network device different from the second access network device, the terminal device may send the report to the third access network device first report.
  • the information related to the process of 2-step CFRA and/or 2-step CBRA may include at least one of the following:
  • the network is configured with the resource configuration information of 2-step CFRA, but the terminal device does not have the indication information of executing 2-step CFRA, or the indication information of whether the terminal device executes 2-step CBRA.
  • the beam information includes at least one of the following: beam identifier, signal quality of the beam, and indication information of whether the signal quality of the beam is higher than a signal quality threshold (for example, it may be a first signal quality threshold).
  • a signal quality threshold for example, it may be a first signal quality threshold.
  • the sending or receiving precoding vector can be identified by index information, and the index information can correspond to the resource identifier (identity, ID) of the configured terminal, for example, the index information can correspond to the configured CSI-RS identifier or resource ; may also be the identifier or resource of the correspondingly configured SSB; or may be the identifier or resource of the correspondingly configured uplink sounding reference signal (Sounding Reference Signal, SRS).
  • the index information may also be index information displayed or implicitly borne by a signal or channel borne by the beam.
  • the energy transmission directivity may refer to performing precoding processing on the signal to be sent by using the precoding vector, and the signal subjected to the precoding processing has a certain spatial directivity. The signal has better received power, such as satisfying the signal-to-noise ratio of reception and demodulation; the energy transfer directivity may also mean that the same signal received from different spatial locations through the precoding vector has different received power.
  • the above-mentioned 2-step CFRA failure or success indication information can indicate whether this 2-step CFRA is successful or failed information (for example, it can be indicated by at least one bit of information), or it can also be the current 2-step CFRA. Failure reason value (if the reason value is not included, it can be considered that this 2-step CFRA is successful), or it can include both of the above information, that is to say, it includes both indicating whether this 2-step CFRA is successful or failed. information, including the failure reason value.
  • the above-mentioned 2-step CBRA failure or success indication information can be information indicating whether the 2-step CBRA is successful or unsuccessful this time (for example, it can be indicated by at least one bit of information), or it can be used to indicate whether the 2-step CBRA is detected this time.
  • the information to the conflict can also be the failure cause value indicating the 2-step CBRA this time (if the cause value is not included, it can be considered that the 2-step CFRA is successful this time), or it can include all of the above information.
  • the failure cause value may include information indicating which part of the MSGA failed to decode, or may indicate that a competition is detected.
  • the information element contentionDetected can be used to indicate that the contention is detected, and the value of the information element can be as follows: If the corresponding contention resolution ID is not successfully detected, that is, the competition is detected, then the information element is set to true , otherwise, set to false.
  • the time information when 2-step CFRA fails or the time information when 2-step CBRA fails can be the time information when 2-step CFRA or 2-step CBRA fails.
  • the time information when 2-step CFRA or 2-step CBRA is successful can be the time information when 2-step CFRA or 2-step CBRA is successful.
  • the first information may further include at least one of the following information: the total number of MSGA transmissions, the maximum number of MSGA transmissions, the signal quality threshold (for example, one or more of X, Y, and Z), The identifier of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information of each 4-step CBRA failure or success, the time information when the 4-step CBRA is successful, and the time information when the 4-step CBRA is successful.
  • the signal quality threshold for example, one or more of X, Y, and Z
  • step Time information when CBRA fails indication information that the network is not configured with 4-step CFRA resource configuration information, and the total number of MSG3 transmissions (that is, the terminal equipment falls back from two-step random access to four-step random access after , the number of four-step random access attempts).
  • the first information may further include information (referred to as fallback mode information) instructing the terminal equipment to fall back from two-step random access to four-step random access, wherein the terminal equipment falls back in a manner Can be an explicit (passive) fallback or an implicit (active) active fallback. It can be understood that the random access from two steps may be CBRA with fallback to four steps, which is not limited in this embodiment of the present application.
  • fallback mode information information instructing the terminal equipment to fall back from two-step random access to four-step random access, wherein the terminal equipment falls back in a manner Can be an explicit (passive) fallback or an implicit (active) active fallback.
  • the total number of transmissions of MSGA refers to the sum of the number of transmissions of MSGA in the process of 2-step CFRA and 2-step CBRA.
  • the maximum number of transmissions and the first signal quality threshold value of the MSGA may be configured by the network, or may be pre-specified, and the embodiment of the present application does not limit the configuration mode or size thereof.
  • the indication information about the failure or success of 4-step CBRA, the time information when 4-step CBRA is successful, and the time information when 4-step CBRA fails are similar to the above-mentioned 2-step CBRA, and will not be repeated here.
  • the content included in the first information may be different.
  • the first information may include at least one of the following information: the total number of times of sending the MSGA of the 2-step CFRA, the information of the beam corresponding to the MSGA in each 2-step CFRA, the failure of each 2-step CFRA, or Success indication information, time information every time 2-step CFRA fails, time information when 2-step CFRA succeeds, and indication information that the network is configured with 2-step CFRA resource configuration information.
  • it may also include at least one of the total number of transmissions of MSGA, the maximum number of transmissions of MSGA, the first signal quality threshold value (for example, X), and the indication information that the network does not configure the resource configuration information of the 4-step CFRA. .
  • the first information may include at least one of the following information: the total number of transmission times of the MSGA of the 2-step CFRA, the information of the beam corresponding to the MSGA in each 2-step CFRA, the failure of each 2-step CFRA, or Success indication information, time information when each 2-step CFRA fails, indication information that the network is configured with 2-step CFRA resource configuration information, 2-step CBRA MSGA total transmission times, every 2-step CBRA in The beam information corresponding to MSGA, the indication information of each 2-step CBRA failure or success, the time information when each 2-step CBRA fails, and the time information when the 2-step CBRA succeeds.
  • it may also include at least one of the total number of transmissions of MSGA, the maximum number of transmissions of MSGA, the first signal quality threshold value (for example, X), and the indication information that the network does not configure the resource configuration information of the 4-step CFRA. .
  • the first information may include at least one of the following information: the total number of transmission times of the MSGA of the 2-step CFRA, the information of the beam corresponding to the MSGA in each 2-step CFRA, the failure of each 2-step CFRA, or Success indication information, time information when each 2-step CFRA fails, indication information that the network is configured with 2-step CFRA resource configuration information, 2-step CBRA MSGA total transmission times, every 2-step CBRA in The beam information corresponding to MSGA, the indication information of each 2-step CBRA failure or success, and the time information when each 2-step CBRA fails.
  • it can also include the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and the 4-step CBRA is successful.
  • the first information may include at least one of the following information: the total number of times of sending the MSGA of the 2-step CFRA, the information of the beam corresponding to the MSGA in each 2-step CFRA, the failure of each 2-step CFRA, or Success indication information, time information when each 2-step CFRA fails, indication information that the network is configured with 2-step CFRA resource configuration information, 2-step CBRA MSGA total transmission times, every 2-step CBRA in The beam information corresponding to MSGA, the indication information of each 2-step CBRA failure or success, and the time information when each 2-step CBRA fails.
  • it can also include the identification of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and each 4-step CBRA fails. time information, indication information of resource configuration information of 4-step CFRA not configured in the network, total number of MSGA transmissions, maximum transmission times of MSGA, first signal quality threshold (for example, X), fallback mode information, MSG3 at least one of the total number of transmissions.
  • the first information may include at least one of the following information: the indication information of the resource configuration information that the network is configured with 2-step CFRA, the indication information of whether the terminal device executes 2-step CFRA, the network is configured with 2-step CFRA resource configuration information, but the terminal device does not have the instruction information to execute 2-step CFRA, the total number of MSGA transmissions of 2-step CBRA, the information of the beam corresponding to MSGA in each 2-step CBRA, and the failure of each 2-step CBRA Or successful indication information, time information every time 2-step CBRA fails, and time information when 2-step CBRA succeeds.
  • it may also include at least one of the total number of transmissions of MSGA, the maximum number of transmissions of MSGA, the first signal quality threshold value (for example, X), and the indication information that the network does not configure the resource configuration information of the 4-step CFRA. .
  • the first information may include at least one of the following information: the indication information of the resource configuration information that the network is configured with 2-step CFRA, the indication information of whether the terminal device executes 2-step CFRA, the network is configured with 2-step CFRA resource configuration information, but the terminal device does not have the instruction information to execute 2-step CFRA, the total number of MSGA transmissions of 2-step CBRA, the information of the beam corresponding to MSGA in each 2-step CBRA, and the failure of each 2-step CBRA Or success indication information, time information every time 2-step CBRA fails.
  • it can also include the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and the 4-step CBRA is successful.
  • the first information may include at least one of the following information: the indication information of the resource configuration information that the network is configured with 2-step CFRA, the indication information of whether the terminal device executes the 2-step CFRA, the network is configured with the 2-step CFRA resource configuration information, but the terminal device does not have the instruction information to execute 2-step CFRA, the total number of MSGA transmissions of 2-step CBRA, the information of the beam corresponding to MSGA in each 2-step CBRA, and the failure of each 2-step CBRA Or success indication information, time information every time 2-step CBRA fails.
  • it can also include the identification of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and each 4-step CBRA fails. time information, indication information of resource configuration information of 4-step CFRA not configured in the network, total number of MSGA transmissions, maximum transmission times of MSGA, first signal quality threshold (for example, X), fallback mode information, MSG3 at least one of the total number of transmissions.
  • the first information may include at least one of the following information: the indication information of the resource configuration information that the network is configured with 2-step CFRA, the indication information of whether the terminal device executes the 2-step CFRA, the network is configured with the 2-step CFRA resource configuration information, but the terminal device does not have the indication information to perform 2-step CFRA.
  • it can also include the indication information of whether the terminal device executes 2-step CBRA, the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, each 4-step CBRA failure or Success indication information, time information when 4-step CBRA fails, time information when 4-step CBRA succeeds, indication information of resource configuration information that the network does not configure 4-step CFRA, total number of MSGA transmissions, MSGA At least one of the maximum number of transmissions, the first signal quality threshold value (for example, X), and the total number of transmissions of the MSG3.
  • the first information may include at least one of the following information: the indication information of the resource configuration information that the network is configured with 2-step CFRA, the indication information of whether the terminal device executes 2-step CFRA, the network is configured with 2-step CFRA resource configuration information, but the terminal device does not have the indication information to perform 2-step CFRA.
  • it can also include the indication information of whether the terminal device executes 2-step CBRA, the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, each 4-step CBRA failure or Success indication information, time information when each 4-step CBRA fails, indication information that the network does not configure the resource configuration information of 4-step CFRA, the total number of MSGA transmissions, the maximum transmission times of MSGA, and the first signal quality threshold At least one of a value (eg, X) and the total number of transmissions of MSG3.
  • a value eg, X
  • the first information may include at least one of the following information: indication information that the network is not configured with resource configuration information of 2-step CFRA, the total number of times of sending MSGA of 2-step CBRA, MSGA in each 2-step CBRA The information of the corresponding beam, the indication information of each 2-step CBRA failure or success, the time information each time the 2-step CBRA fails, and the time information when the 2-step CBRA succeeds.
  • it may also include at least one of the total number of transmissions of MSGA, the maximum number of transmissions of MSGA, the second signal quality threshold (such as Y or Z), and the indication information that the network does not configure the resource configuration information of the 4-step CFRA.
  • the first information may include at least one of the following information: the indication information that the network is not configured with the resource configuration information of the 2-step CFRA, the total number of times of sending the MSGA of the 2-step CBRA, the MSGA in each 2-step CBRA The information of the corresponding beam, the indication information of each 2-step CBRA failure or success, and the time information when each 2-step CBRA fails.
  • it can also include the identification of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and the 4-step CBRA is successful.
  • the first information may include at least one of the following information: the indication information that the network is not configured with the resource configuration information of the 2-step CFRA, the total number of times of sending the MSGA of the 2-step CBRA, the MSGA in each 2-step CBRA The information of the corresponding beam, the indication information of each 2-step CBRA failure or success, and the time information when each 2-step CBRA fails.
  • it can also include the identification of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, the indication information that each 4-step CBRA fails or succeeds, and each 4-step CBRA fails. time information, indication information that the network is not configured with 4-step CFRA resource configuration information, the total number of MSGA transmissions, the maximum number of MSGA transmissions, the second signal quality threshold (such as Y or Z), and fallback method information at least one of them.
  • the first information may include at least one of the following information: indication information that the network is not configured with the resource configuration information of the 2-step CFRA.
  • indication information that the network is not configured with the resource configuration information of the 2-step CFRA.
  • it can also include the indication information of whether the terminal device executes 2-step CBRA, the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, each 4-step CBRA failure or Success indication information, time information when 4-step CBRA fails, time information when 4-step CBRA succeeds, indication information of resource configuration information that the network does not configure 4-step CFRA, total number of MSGA transmissions, MSGA At least one of the maximum number of transmissions and the second signal quality threshold (eg, Y or Z).
  • the first information may include at least one of the following information: indication information that the network is not configured with the resource configuration information of the 2-step CFRA.
  • indication information that the network is not configured with the resource configuration information of the 2-step CFRA.
  • it can also include the indication information of whether the terminal device executes 2-step CBRA, the identity of the corresponding beam and/or the signal quality of the beam when the preamble is sent in each 4-step CBRA, each 4-step CBRA failure or Success indication information, time information when each 4-step CBRA fails, indication information that the network is not configured with 4-step CFRA resource configuration information, the total number of MSGA transmissions, the maximum transmission times of MSGA, and the second signal quality threshold at least one of the values (eg, Y or Z).
  • the information reported by the terminal device can support scenarios related to the 2-step RACH process, so that the reporting The information is more comprehensive, and further, the success rate of random access can be improved.
  • S404 may be executed, or if the third access network device receives the first report , S404 ′ and S405 can be executed (as shown in FIG. 5 ). It can be understood that different access network devices perform different processing after receiving the first report.
  • the second access network device receives the first report from the terminal device, and performs processing according to the first report.
  • the second access network device when the second access network device receives the second message from the terminal device, the second access network device obtains the first report from the second message, and determines that the access network device is the access corresponding to the first report. network equipment, then the second access network equipment performs processing according to the first information included in the first report, for example, information related to the process of 2-step CFRA and/or 2-step CBRA, wherein the processing that can be performed includes: Optimize the two-step random access parameters configured for the terminal device to improve the success probability of the terminal device's random access.
  • the third access network device receives the first report from the terminal device.
  • the terminal device can perform RRC re-establishment on the third access network device, and send RRC to the third access network device.
  • the third access network device sends the second message, and the third access network device receives the first report from the terminal device.
  • the processing that the third access network device can perform according to the first report includes: : send part or all of the information of the first report to the second access network device (that is, execute S405), optionally, part or all of the information of the first report includes the information related to 2-step CFRA and/or 2-step CBRA
  • the process-related information enables the second access network device to optimize the two-step random access parameter configured for the terminal device, thereby improving the success probability of random access.
  • the third access network device may also send type information of the first report.
  • the type of the first report may be pure 5G (such as NR or gNB), 4G connected to the 5G core network (such as eLTE or ng-eNB), and pure 4G (such as LTE or eNB).
  • the second access network device may determine the encoding format of the first report according to the type information of the first report, so as to perform corresponding decoding.
  • part or all of the information of the first report includes at least information indicating a process related to 2-step CFRA) and/or 2-step CBRA.
  • the third access network device may directly or indirectly send part or all of the information of the first report and the type information of the first report to the second access network device. For example, if there is an interface that can communicate directly between the third access network device and the second access network device, the third access network device sends part or all of the first report to the second access network device through the interface information, and the type information of the first report.
  • the interface between the third access network device and the second access network device may be an X2 interface or an Xn interface.
  • the third access network device may, for example, send part or all of the information of the first report to the second access network device through a failure indication (FAILURE INDICATION, RLF INDICATION) message and a handover report (HANDOVER REPORT) message, and the first report.
  • FAILURE INDICATION, RLF INDICATION a failure indication
  • HANDOVER REPORT a handover report
  • the third access network device may send the part of the first report to the second access network device through another device (eg, core network device) Or all information and type information of the first report.
  • the third access network device sends part or all of the information of the first report and the type information of the first report to the core network device through an interface (such as an S1 or NG interface) between the third access network device and the core network device, The core network device then forwards the information received from the third access network device to the second access network device.
  • the third access network device may, for example, send part or all of the information of the first report to the second access network device through the following messages on the S1/NG interface: an uplink RAN configuration transmission (UPLIKN RAN CONFIGURATION TRANSFER) message, a downlink RAN Configuration transfer (DOWNLIKN RAN CONFIGURATION TRANSFER) message, base station configuration transfer (eNB CONFIGURATION TRANSFER) message or core network equipment configuration transfer (MME CONFIGURATION TRANSFER) message.
  • UPFN RAN CONFIGURATION TRANSFER uplink RAN configuration transmission
  • DOWNLIKN RAN CONFIGURATION TRANSFER downlink RAN Configuration transfer
  • eNB CONFIGURATION TRANSFER base station configuration transfer
  • MME CONFIGURATION TRANSFER core network equipment configuration transfer
  • part or all of the information of the first report may be transmitted between the CU and the DU, the CU may send all or part of the information of the first report to the DU, or the DU may send the information of the first report to the DU All or part of the information is sent to the CU.
  • the gNB-CU can send the part of the first report or the gNB-DU (second access network device) corresponding to/belonging to the gNB-CU through the F1 interface. full information.
  • F1 setup response F1 SETUP RESPONSE
  • F1 setup failure F1 SETUP FAILURE
  • user equipment context setup request UE CONTEXT SETUP REQUEST
  • GNB-DU CONFIGURATION UPDATE ACKNOWLEDGE GNB-DU configuration update failure
  • GNB-CU configuration update GNB-CU CONFIGURATION UPDATE
  • the third access network device sends all or part of the information of the first report to the second access network device.
  • the second access network device will receive all or part of the information of the first report from the third access network device and process according to the received information.
  • the second access network device can analyze and/or judge the fallback cause and/or the random access failure cause and/or judge the 2-step CFRA Whether the resource configuration information of the device is properly configured, etc., can be adjusted accordingly, so as to improve the success probability of random access of the terminal device or reduce the delay of random access.
  • the second access network device can decide whether to configure 2-step CFRA resources for the terminal device in the future according to whether the 2-step CFRA resources configured for the terminal device are useful; It is found in the report that the terminal device always falls back from two-step random access to four-step random access. It can be considered that the previously set signal quality threshold is unreasonable.
  • the signal quality threshold corresponding to two-step random access can be increased. Therefore, two-step random access is only performed under appropriate circumstances; for another example, the second access network device finds according to the first report that when the terminal device performs 2-step CBRA, the competition often fails, and it can be considered that the second access network device If the resources allocated by the device for CBRA are insufficient, the subsequent second access network device may increase the resources for CBRA.
  • each network element or device may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module . Whether one of the above functions is performed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • FIG. 6 is a schematic block diagram of a communication apparatus 600 according to an embodiment of the present application.
  • the communication apparatus 600 may correspondingly implement the functions or steps implemented by the terminal device in each of the foregoing method embodiments.
  • the communication apparatus 600 may be a terminal device or a component (for example, a chip or a circuit, etc.) applicable to the terminal device, or the communication apparatus 600 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication apparatus may include a receiving unit 610 , a processing unit 620 and a sending unit 630 .
  • the receiving unit 610 may be configured to receive the first message from the first access network device; the processing unit 620 may be configured to perform random access on the target cell and generate the first report; the sending unit 630 may be configured to send the first message. a report.
  • processing unit 620 in this embodiment of the present application may be implemented by at least one processor or processor-related circuit components, and the receiving unit 610 and the sending unit 630 may be implemented by a transceiver or transceiver-related circuit components.
  • the foregoing units may be separated or integrated, which is not limited in this embodiment of the present application.
  • the communication device 600 may further include a storage unit 640, the storage unit 640 may be used to store instructions or data, and the processing unit 620 may execute or read the instructions or data stored in the storage unit, so that the communication device implement the corresponding operation.
  • the storage unit 640 may be implemented by at least one memory.
  • the communication apparatus 700 provided by the embodiment of the present application can implement the functions of the second access network device or the third access network device in the method provided by the embodiment of the present application.
  • the communication apparatus 700 may be an access network device; or the communication apparatus 700 may also be a device capable of supporting the second access network device or the third access network device to implement the functions corresponding to the methods provided in the embodiments of this application; or,
  • the communication apparatus 700 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication apparatus 700 may include a transceiving unit 710 and a processing unit 720 .
  • the transceiver unit 710 is configured to receive all or part of the information of the first report, wherein the whole or part of the information of the first report includes the 2-step CFRA and/or Or the information related to the 2-step CBRA process, the processing unit 720 is configured to process according to all or part of the information of the first report.
  • the transceiver unit 710 is configured to receive a first report, where the first report includes information related to the process of 2-step CFRA and/or 2-step CBRA, and process the The unit 720 is configured to determine that the received first report corresponds to the second access network device, and the transceiver unit 710 is further configured to send all or part of the first information to the second access network device.
  • the processing unit 720 in this embodiment of the present application may be implemented by at least one processor or a processor-related circuit component, and the transceiver unit 710 may be implemented by a transceiver or a transceiver-related circuit component.
  • the foregoing units may be separated or integrated, which is not limited in this embodiment of the present application.
  • the communication device 700 may further include a storage unit 730, the storage unit 730 may be used to store instructions or data, and the processing unit 720 may execute or read the instructions or data stored in the storage unit, so that the communication device implement the corresponding operation.
  • the storage unit 730 may be implemented by at least one memory.
  • Embodiments of the present application also provide a communication apparatus 800, which can be used to implement or support the communication apparatus 800 to implement the second access network device or the third access network device or the terminal device in the method provided by the embodiment of the present application.
  • the communication device 800 includes at least one processor 810 and at least one memory 820 for storing program instructions and/or data.
  • Memory 820 is coupled to processor 810 .
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • Processor 810 may cooperate with memory 820 .
  • the processor 810 may execute program instructions and/or data stored in the memory 820 to cause the communication device 800 to implement the corresponding method.
  • at least one of the at least one memory may be included in the processor.
  • the communication apparatus 800 may also include a communication interface 830 for communicating with other devices through a transmission medium, so that the devices used in the communication apparatus 800 may communicate with other devices.
  • connection medium between the communication interface 830 , the processor 810 , and the memory 820 is not limited in the embodiments of the present application.
  • the memory 820, the processor 810, and the communication interface 830 are connected through a bus 840 in FIG. 8, and the bus is represented by a thick line in FIG.
  • a schematic illustration is provided, but not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 8, but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can be implemented or executed
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random Access memory (random-access memory, RAM).
  • Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and/or data.
  • the embodiments of the present application further provide a communication system, which is used to implement all or part of the steps of the foregoing method embodiments.
  • the communication system may include the aforementioned at least one first access network device and at least one second access network device, and optionally, may further include the aforementioned terminal device and/or the third access network device.
  • Embodiments of the present application further provide a computer-readable storage medium, including instructions, which, when executed on a computer, cause the method performed by the terminal device in FIG. 4 or FIG. 5 to be executed.
  • Embodiments of the present application further provide a computer-readable storage medium, including instructions, which, when executed on a computer, cause the method performed by the second access network device in FIG. 4 or FIG. 5 to be performed.
  • Embodiments of the present application further provide a computer-readable storage medium, including instructions, which, when executed on a computer, cause the method performed by the third access network device in FIG. 4 or FIG. 5 to be performed.
  • the embodiments of the present application also provide a computer program product, which includes instructions, which when run on a computer, cause the second access network device, or the third access network device or the terminal device in FIG. 4 or FIG. 5 to execute the method is executed.
  • At least one (a) of a, b or c may represent: a, b, c, a-b, a-c, b-c or a-b-c, wherein a, b, c may be single or multiple.
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are not used to limit the order, sequence, priority, or importance of multiple objects.
  • first message and the second message are only for distinguishing different messages, but do not indicate the difference in priority, sending order, or importance of the two kinds of messages.
  • processors mentioned in the embodiments of the present application may be a CPU, and may also be other general-purpose processors, digital signal processors (digital signal processors, DSPs), application specific integrated circuits (application specific integrated circuits, ASICs), ready-made Field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGA Field programmable gate array
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory mentioned in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous DRAM
  • SDRAM double data rate synchronous dynamic random access memory
  • double data rate SDRAM double data rate SDRAM
  • DDR SDRAM enhanced synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SCRAM synchronous link dynamic random access memory
  • direct rambus RAM direct rambus RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components
  • the memory storage module
  • memory described herein is intended to include, but not be limited to, these and any other suitable types of memory.
  • the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the embodiments of the present application are produced in whole or in part.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Drive (SSD)), and the like.

Abstract

La présente demande concerne un procédé, un appareil et un système de communication. Le procédé comprend : la réception d'un premier message en provenance d'un premier dispositif de réseau d'accès, le premier message comprenant des informations de configuration de ressources CFRA en deux étapes et/ou des informations de configuration de ressources CBRA en deux étapes ; sur la base du premier message, la réalisation d'un accès aléatoire à une cellule cible et l'envoi d'un premier rapport, le premier rapport comprenant des premières informations, et les premières informations comprenant des informations liées à la procédure CFRA en deux étapes et/ou à la procédure CBRA en deux étapes.
PCT/CN2020/123003 2020-10-22 2020-10-22 Procédé, appareil et système de communication WO2022082674A1 (fr)

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