WO2020151650A1 - Procédé de réinitialisation pour couche de contrôle de liaison radio et équipement utilisateur - Google Patents

Procédé de réinitialisation pour couche de contrôle de liaison radio et équipement utilisateur Download PDF

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Publication number
WO2020151650A1
WO2020151650A1 PCT/CN2020/073178 CN2020073178W WO2020151650A1 WO 2020151650 A1 WO2020151650 A1 WO 2020151650A1 CN 2020073178 W CN2020073178 W CN 2020073178W WO 2020151650 A1 WO2020151650 A1 WO 2020151650A1
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WIPO (PCT)
Prior art keywords
random access
system information
user equipment
rlc
rlc entity
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PCT/CN2020/073178
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English (en)
Chinese (zh)
Inventor
张崇铭
刘仁茂
坪井秀和
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夏普株式会社
鸿颖创新有限公司
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Publication of WO2020151650A1 publication Critical patent/WO2020151650A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates to the field of wireless communication technology, and more specifically, the present invention relates to a method for resetting a radio link control layer and a user equipment.
  • Non-Patent Document RP-160671 New SID Proposal: Study on New Radio Access Technology.
  • the working frequency band of the new communication standard in the future can be expanded to 100GHz, and at the same time it will at least meet the needs of enhanced mobile broadband services, the communication needs of massive IoT terminals, and the business needs of high reliability requirements.
  • the project research work will be completed in 2018.
  • UE User Equipment, user equipment/terminal equipment
  • RRCSystemInfoRequest message which is an RRC (Radio Resource Control, radio resource control) layer message, which is sent to the lower layer for transmission after being generated at the RRC layer.
  • RLC Radio Link Control
  • RLC PDU Protocol Data Unit
  • the RLC PDU in the buffer area is sent to the MAC layer, and at the same time the buffer area is emptied, which contains the After the RLC PDU of the RRC message is sent to the MAC layer, the buffer area becomes empty.
  • FIG. 4 schematically shows the steps of the MAC layer performing the random access process in the process of obtaining system information through request. Below, FIG. 4 is used to describe the steps of the MAC layer performing the random access procedure.
  • the random access procedure performed by the MAC layer includes the following steps.
  • RAR Random Access Response
  • the MAC layer of the UE will indicate to the RLC layer as mentioned above.
  • the RLC layer sends the RLC PDU in the buffer to the MAC layer.
  • the PDU will be MAC
  • the form of PDU is stored in MSG3 buffer (buffer area).
  • S44 The UE sends the MAC PDU in the MSG3 buffer to the base station. This step may be called MSG3 sending.
  • step S42 if the UE does not obtain a valid uplink grant (UL grant) in step S42, then the data in the RLC buffer will not be emptied. If the UE needs to establish an RRC connection at this time, the UE will generate an RRC connection establishment request message RRCSetupReqest message, and send it to the lower layer. Similarly, this message will be buffered in the RLC transmission buffer in the form of RLC PDU. In this way, there are two RLC PDUs in the transmission buffer area of the RLC, one RLC PDU carries the RRCSystemInfoRequest message, and the other RLC PDU carries the RRCSetupReqest message.
  • the MAC layer is undergoing a random access process, which is triggered by the establishment of an RRC connection.
  • the UE receives a valid uplink grant (UL grant) and will indicate to the RLC.
  • the RLC PDU carrying the RRCSystemInfoRequest message will be sent to the MAC first. Therefore, the UE originally wanted to send an RRC connection establishment message, but because the RLC buffer had a system information request message that could not be sent before, an error message was sent. How to avoid this kind of error is a problem that needs to be solved.
  • the present invention provides a method and user equipment for resetting the radio link control layer that can solve the above-mentioned problems in the process of acquiring system information.
  • a method for resetting the radio link control layer including: a user equipment requests to obtain system information, and when receiving an indication of a random access problem or an indication of a failure of the system information request, the user equipment releases the wireless link Road control RLC entity.
  • the user equipment requesting to obtain system information specifically includes: setting the content of the RRCSystemInfoRequest message, which is a radio resource control system information request message, and submitting the message to the lower layer for transmission.
  • the user equipment if the user equipment receives an indication of a random access problem or an indication of a failure of the system information request while waiting for the lower layer to indicate the system information request confirmation information, the user equipment releases the RLC entity that carries the signaling SRB0 Or reset the media access control MAC layer.
  • the user equipment when the user equipment decides to stop a random access process, the user equipment indicates a random access problem or a system information request failure to the upper layer.
  • the random access response receiving window ra-ResponseWindow when the random access response receiving window ra-ResponseWindow times out, and the user equipment has not yet received the random access response carrying the random access preamble sequence identifier that matches the sequence number of the sent preamble sequence During RAR, judge the value of the variable PREAMBLE_TRANSMISSION_COUNTER.
  • PREAMBLE_TRANSMISSION_COUNTER When its value is equal to the maximum allowable transmission times of the preamble sequence plus 1, if the random access process is a random access process for requesting system information, or by requesting system information
  • the triggered random access process, or the random access process related to the system information request indicates to the upper layer that the system information request failed. If the random access process is not a random access process related to the system information request, then Indicate random access problems to the upper layer.
  • the specific operation of the user equipment to release the RLC entity is: the RLC layer is requested by the upper layer to release the RLC entity, and the user equipment discards all radio link control service data units RLC SDU and radio link control protocol data Unit RLC PDU, and release RLC entity.
  • the specific operation of the user equipment to release the RLC entity is: the user equipment establishes the RLC entity or rebuilds the RLC entity.
  • establishing the RLC entity or rebuilding the RLC entity includes discarding all RLC SDUs and RLC PDUs, and setting or resetting the state variable of the RLC to an initial value.
  • the stopped random access process is a random access process used to request system information, or a random access process triggered by a system information request, or is related to a system information request Random access process.
  • the present invention provides a user equipment, comprising: a processor; and a memory storing instructions, wherein the instructions execute the method according to any one of claims 1 to 9 when run by the processor.
  • FIG. 1 schematically shows a flowchart of a method for resetting a radio link control layer in Embodiment 1 of the present disclosure.
  • FIG. 2 schematically shows a flowchart of a method for resetting a radio link control layer in Embodiment 2 of the present disclosure.
  • Fig. 3 schematically shows a block diagram of the user equipment involved in the present disclosure.
  • FIG. 4 schematically shows the steps of the MAC layer performing the random access process in the process of obtaining system information through request.
  • the UE there are two ways for the UE to obtain system information: the first is to broadcast the system information through the base station, and the UE receives the broadcasted system information to obtain the content of the system information; the second is to obtain the system information in an on-demand manner
  • the so-called on-demand method means that the UE sends a system information request message to the base station/network, which can be a specific preamble sequence, a preamble sequence corresponding to a specific system information type, or an RRC message; the network side/base station receives the request After the message, at a specific time, the system information is sent by broadcasting, and the UE receives the broadcasted system information at the corresponding time to obtain the content of the system information. Therefore, the system information obtained by the on-demand method can also be called on-demand system information.
  • the UE obtains the on-demand system information by request.
  • the request process may be that the UE sends an RRCSystemInfoRequest message, which is an RRC layer message, which is transmitted through the CCCH channel.
  • RRCSystemInfoRequest message is carried on SRB0 for transmission.
  • the RLC entity of SRB0 adopts the TM transmission mode.
  • the RRCSystemInfoRequest message is generated at the RRC layer, it is sent to the lower layer for transmission.
  • the message is sent to the RLC layer, it will be buffered in the transmission buffer of the RLC entity corresponding to SRB0 in the form of RLC PDU.
  • the RLC PDU in the buffer area is sent to the MAC layer, and at the same time the buffer area is cleared, that is, the RLC PDU containing the RRC message is sent to the MAC layer After the layer, the buffer area becomes empty (empty).
  • the UE In the process of obtaining system information through request, the UE triggers a random access procedure for SI request at the MAC layer, and this random access procedure is used for system information request.
  • the random access procedure performed by the MAC layer will be described with reference to FIG. 4.
  • the random access process performed by the MAC layer includes the following steps
  • RAR Random Access Response
  • S44 The UE sends the MAC PDU in the MSG3 buffer to the base station. This step may be called MSG3 sending.
  • step S42 if the UE does not receive the RAR, the UE will continue to perform step S41. If the number of times the preamble sequence is sent exceeds or equals the maximum allowable number of times, the MAC can determine that a random access problem has occurred (random access problem) , MAC can indicate the problem to the upper layer.
  • step S42 Considering the reason why the UE did not obtain a valid UL grant in step S42, if the RLC buffer can be cleared when this reason/condition occurs, the problem can be solved.
  • FIG. 1 schematically shows a flowchart of a method for resetting a radio link control layer in Embodiment 1 of the present disclosure. The method for resetting the radio link control layer in Embodiment 1 of the present disclosure will be described in detail with reference to FIG. 1.
  • Embodiment 1 can be any implementation of Embodiment 1. As shown in Figure 1, an implementation of Embodiment 1 can be any implementation of Embodiment 1.
  • Step S11 The UE requests to obtain system information, which may be the UE starting to transmit the RRCSystemInfoRequest message, which may specifically include: setting the content of the RRCSystemInfoRequest message, and submitting the message to the lower layer for transmission.
  • system information which may be the UE starting to transmit the RRCSystemInfoRequest message, which may specifically include: setting the content of the RRCSystemInfoRequest message, and submitting the message to the lower layer for transmission.
  • Step S12 When receiving the random access problem indication, the UE releases the RLC entity of SRB0. Preferably, if the UE receives a random access problem indication while waiting for the lower layer to indicate the system information request acknowledgement (anacknowledgement for SI request), the UE releases the RLC entity of SRB0. And optionally, the UE resets the MAC layer.
  • -It may be based on the prior art and indicated by the MAC layer, specifically including: in a random access process, the UE judges the value of the variable PREAMBLE_TRANSMISSION_COUNTER, when its value is equal to the maximum allowable transmission times of the preamble sequence plus 1, The MAC layer will indicate the random access problem to the upper layer.
  • the UE when the UE decides to stop a random access procedure, the UE indicates the random access problem to the upper layer.
  • the stopped random access process is a random access process for requesting system information, or a random access process triggered by requesting system information, or a random access process related to system information requests.
  • the prior art allows the UE to automatically stop an ongoing random access process and re-trigger a new random access process according to the priority of the triggered random access process event.
  • the UE when the UE is in a random access process triggered by a system information request, if the upper layer of the UE triggers a new random access process due to the request to establish an RRC connection, then from the priority considerations, the RRC connection establishment takes precedence If the level is higher than the system information request, the UE can stop the ongoing random access process, which leads to the "UE cannot obtain a valid UL grant" as described in the background. Then the UE can indicate the random access problem to the upper layer while deciding to stop the ongoing random access process.
  • the MAC layer may indicate the "random access problem", preferably, the MAC layer of MCG.
  • UE release RLC entity in the above process can be: RLC layer is requested by the upper layer to release RLC entity, UE discards all RLC SDU and RLC PDU, and releases RLC entity
  • UE releasing RLC entity in the above process is that the UE establishes or re-establishes the RLC entity, preferably, the UE establishes or re-establishes the RLC entity for SRB0 .
  • Establishing an RLC entity or re-establishing an RLC entity may include discarding all RLC SDUs and RLC PDUs, and setting or resetting the state variables of the RLC to initial values.
  • Embodiment 1 The difference from Embodiment 1 is that in Embodiment 1, the UE releases the RLC entity after receiving the random access problem indication. In this embodiment, the UE can release the RLC entity based on the received system information request failure indication.
  • FIG. 2 schematically shows a flowchart of a method for resetting a radio link control layer in Embodiment 2 of the present disclosure. The method executed by the user equipment in Embodiment 1 of the present disclosure will be described in detail with reference to FIG. 2.
  • Embodiment 2 can be any implementation of Embodiment 2. As shown in Figure 2, an implementation of Embodiment 2 can be any implementation of Embodiment 2.
  • Step S21 The UE requests to obtain system information, which may be the UE starting to transmit the RRCSystemInfoRequest message, which may specifically include: setting the content of the RRCSystemInfoRequest message, and submitting the message to the lower layer for transmission.
  • system information which may be the UE starting to transmit the RRCSystemInfoRequest message, which may specifically include: setting the content of the RRCSystemInfoRequest message, and submitting the message to the lower layer for transmission.
  • Step S22 When receiving the indication that the system information request failed, the UE releases the RLC entity of SRB0. Preferably, if the UE receives an indication that the system information request has failed while waiting for the lower layer to indicate an acknowledgement for SI request, the UE releases the RLC entity of SRB0. And optionally, the UE resets the MAC layer.
  • system information request failure indication can occur in one or more of the following situations:
  • the UE judges the value of the variable PREAMBLE_TRANSMISSION_COUNTER. When its value is equal to the maximum allowable transmission times of the preamble sequence plus 1, if this random access process is used for system information request, or If triggered by a system information request, or related to a system information request, the UE indicates to the upper layer that the system information request has failed. Preferably, the UE determines the value of the variable PREAMBLE_TRANSMISSION_COUNTER in the process of receiving the RAR.
  • -It can also be when the random access response receiving window (ra-ResponseWindow) times out and the UE has not received the RAR that carries the random access preamble identifier (Random Access Preamble identifiers) that matches the sequence number of the sent preamble sequence
  • the value of the variable PREAMBLE_TRANSMISSION_COUNTER is judged; when its value is equal to the maximum allowable number of transmissions of the preamble sequence plus 1, if this random access process is a random access process for requesting system information, or by requesting system information And the random access process triggered, or the random access process related to the system information request, indicates the failure of the system information request to the upper layer; if the random access process is not related to the system information request, the upper layer indicates the random access process Into the problem.
  • this stopped random access process is a random access process used to request system information, or a random access process triggered by a system information request, or a random access process related to a system information request.
  • the UE may perform other operations in Embodiment 1.
  • this "system information request failure indication" may also adopt other names, such as an access failure indication or a RACH failure indication.
  • the MAC layer may indicate "system information request failed", preferably, the MAC layer of MCG.
  • the UE releases the RLC entity based on the instruction, so as to achieve the purpose of clearing the RLC buffer.
  • another method is provided. Considering that the messages sent by the UE through the SRB0 or CCCH logical channel are:
  • RRC reestablishment request message RRC ReestablishmentRequest Message
  • RRC system information request message RRCSystemInfoResqest Message
  • the RLC buffer of the RLC entity of SRB0 stores the RLC PDU that has not been sent before. Therefore, in the process of triggering the transmission of any of the above information, or when sending any of the above information Before or at the same time, the UE rebuilds or releases the RLC entity, preferably, the RLC entity of SRB0.
  • Specific implementations may include:
  • the UE When the upper layer of the UE requests to establish an RRC connection, the UE initiates the RRC connection establishment process.
  • the initial execution behavior at least one of the following behaviors is included:
  • the above-mentioned behaviors occur before the transmission of the RRCSetupRequest message.
  • the UE When the upper layer of the UE requests to establish an RRC connection, the UE initiates the RRC connection establishment process.
  • the UE adopts a pre-configured (specified) or a default (default) CCCH configuration. In the process of adopting this configuration, at least one of the following behaviors is included:
  • the UE initiates the RRC connection recovery process.
  • the behavior including at least one of the following behaviors:
  • the above actions occur before the transmission of the RRCResumeRequest message
  • the UE initiates the RRC connection recovery process.
  • the UE adopts a pre-configured (specified) or a default (default) CCCH configuration. In the process of adopting this configuration, at least one of the following behaviors is included:
  • the UE When the UE requests on-demand system information, the UE adopts the pre-configured (specified) or the default (default) CCCH configuration.
  • the configuration process includes at least one of the following actions:
  • the present disclosure provides a method for resetting the radio link control layer that can solve the problems generated in the process of acquiring system information.
  • FIG. 3 is used to illustrate a user equipment that can execute the method executed by the user equipment described in detail above in this disclosure as a modified example.
  • Fig. 3 is a block diagram schematically showing a user equipment involved in the present disclosure.
  • the user equipment UE80 includes a processor 801 and a memory 802.
  • the processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 802 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories.
  • the memory 802 stores program instructions. When the instruction is executed by the processor 801, it can execute the above-mentioned method executed by the user equipment described in detail in the present invention.
  • the method and related equipment of the present disclosure have been described above in conjunction with preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and the various embodiments described above can be combined with each other without any contradiction.
  • the method of the present invention is not limited to the steps and sequence shown above.
  • the user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future that can be used for base stations, MMEs, or UEs, and so on.
  • the various identifiers shown above are only exemplary rather than restrictive, and the present disclosure is not limited to specific information elements as examples of these identifiers. Those skilled in the art can make many changes and modifications based on the teaching of the illustrated embodiment.
  • base station may refer to a mobile communication data and control switching center with larger transmission power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission.
  • User equipment may refer to a user's mobile terminal, for example, including mobile phones, notebooks, and other terminal devices that can communicate with base stations or micro base stations wirelessly.
  • the program running on the device according to the present invention may be a program that enables the computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
  • the program or the information processed by the program can be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • a program for realizing the functions of each embodiment of the present invention can be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing the computer system to read the programs recorded on the recording medium and execute these programs.
  • the so-called "computer system” herein may be a computer system embedded in the device, and may include an operating system or hardware (such as peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium storing a program dynamically for a short time, or any other recording medium readable by a computer.
  • the above-mentioned embodiments of the present disclosure can be implemented by software, hardware or a combination of both software and hardware.
  • the various components inside the base station and the user equipment in the foregoing embodiment may be implemented by various devices.
  • Various features or functional modules of the devices used in the above-mentioned embodiments may be implemented or executed by circuits (for example, single-chip or multi-chip integrated circuits). Circuits designed to perform the functions described in this specification can include general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination of the above devices.
  • DSP digital signal processor
  • ASIC application-specific integrated circuits
  • FPGA field programmable gate arrays
  • the general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine.
  • the above-mentioned circuit can be a digital circuit or an analog circuit.
  • one or more embodiments of the present invention can also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the above-mentioned embodiment. Although various examples of the embodiment have been described, the present invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioning, office equipment, vending machines, and other household appliances.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de réinitialisation pour une couche de contrôle de liaison radio (RLC), et un équipement utilisateur. Le procédé de réinitialisation pour la couche de contrôle de liaison radio comprend les étapes suivantes : un équipement utilisateur demande d'obtenir des informations système, et lors de la réception d'une indication d'un problème d'accès aléatoire ou d'une indication selon laquelle la demande d'informations système échoue, l'équipement utilisateur libère une entité RLC.
PCT/CN2020/073178 2019-01-22 2020-01-20 Procédé de réinitialisation pour couche de contrôle de liaison radio et équipement utilisateur WO2020151650A1 (fr)

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