WO2024056024A1 - Procédé mis en œuvre par un équipement utilisateur et équipement utilisateur - Google Patents

Procédé mis en œuvre par un équipement utilisateur et équipement utilisateur Download PDF

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Publication number
WO2024056024A1
WO2024056024A1 PCT/CN2023/118784 CN2023118784W WO2024056024A1 WO 2024056024 A1 WO2024056024 A1 WO 2024056024A1 CN 2023118784 W CN2023118784 W CN 2023118784W WO 2024056024 A1 WO2024056024 A1 WO 2024056024A1
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WIPO (PCT)
Prior art keywords
handover
failure
report
command
handover failure
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PCT/CN2023/118784
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English (en)
Chinese (zh)
Inventor
常宁娟
刘仁茂
Original Assignee
夏普株式会社
常宁娟
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Application filed by 夏普株式会社, 常宁娟 filed Critical 夏普株式会社
Publication of WO2024056024A1 publication Critical patent/WO2024056024A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present disclosure relates to the field of wireless communication technology, and more specifically, the present disclosure relates to a wireless link failure information reporting method in the case of handover failure performed by user equipment and the corresponding user equipment.
  • the research purpose of this project is to enhance the network data collection process in the NR system based on the network self-optimization mechanism of version 17, so as to better realize the purpose of self-organizing self-optimizing network and minimizing drive testing.
  • One of the specific technologies studied is the mobile performance optimization method in the scenario of switching between different systems.
  • This disclosure proposes a solution to the problem of how to implement failure information reporting in handover failure scenarios in NR systems of version 18 and previous versions.
  • the purpose of the embodiments of the present disclosure is to propose a solution to the problem of how to implement failure information reporting in the NR system. More specifically, the present disclosure proposes a solution to the problem of recording and reporting failure information in a primary cell group handover failure scenario in an NR system.
  • Embodiments of the present disclosure provide a failure information reporting method executed in user equipment, corresponding user equipment, and a communication system.
  • a method executed by user equipment UE including: receiving a handover command from the network side; determining whether handover failure occurs; and in the case of the handover failure, setting the variable VarRLF -Report stores the switching failure information including the reasons for the switching failure.
  • receiving the handover command from the network side further includes: performing access to the target cell according to the configuration in the handover command, and starting the handover process monitoring timer T304.
  • the handover command is a mobility command MobilityFromNRCommand from NR
  • the handover command is the mobility command MobilityFromEUTRACommand from EUTRA.
  • the handover failure includes at least one of the following situations: the UE cannot successfully establish a connection with the target RAT; the timer T304 for monitoring the handover process times out; the UE cannot Apply the configuration or part of the configuration contained in the handover command; and because the inter-RAT information contained in the handover command has a protocol error, the UE fails in the handover process according to the protocol of the target RAT.
  • the cause of the handover failure is set as one of the causes of the handover failure based on the situation included in the handover failure.
  • the cause of switching failure field is set to "T304 timeout” or "other".
  • the handover failure cause field is included in the variable VarRLF-Report.
  • a method performed by user equipment UE including: receiving a UE information request UEInformationRequest message from the network side; and setting rlf-Report in the UE information response UEInformationResponse message to a saved variable
  • the rlf-Report content in VarRLF-Report is used to send the UEInformationResponse message to the network side.
  • the rlf-Report content contained in the RRC message at least includes a field indicating the reason for the handover failure.
  • a user equipment UE including: a processor; and a memory storing instructions; wherein the instructions execute the above-mentioned first aspect and the above-mentioned second aspect when executed by the processor. Any of the methods described in this aspect.
  • the network side can learn the link failure situation in the entire process, thereby realizing the adjustment and optimization of mobility parameters.
  • FIG. 1 is a flowchart illustrating the basic process of a method performed by user equipment UE in Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart showing the basic process of the method performed by the user equipment UE in Embodiment 2 of the present invention.
  • FIG. 3 is a schematic structural block diagram showing the user equipment UE according to the present disclosure.
  • the following uses the NR mobile communication system and its subsequent evolved versions as an example application environment to specifically describe multiple embodiments according to the present disclosure.
  • the present disclosure is not limited to the following embodiments, but may be applicable to more other wireless communication systems.
  • the concepts of cell and base station can be interchanged; handover refers to the change of the primary cell initiated by the network side, that is, the primary cell of the UE is changed from the source cell to the target cell.
  • the source cell can also be called the source base station, or the source beam (beam), source transmission point (Transmission point, TRP), source primary cell (Primary Cell, PCell), source main cell group (Master Cell Group, MCG); target A cell may also be called a target base station, or a target beam, a target transmission point, a target primary cell PCell, or a target cell group MCG.
  • the source cell refers to the connected cell serving the UE before the handover process is initiated, that is, the cell that sends a Radio Resource Control (RRC) message to the UE for triggering the handover process.
  • RRC Radio Resource Control
  • the target cell refers to the cell indicated by the target cell identifier included in the handover command, or described as the cell that performs downlink synchronization and random access during the handover process.
  • the handover command described in this disclosure is used to trigger the UE to perform handover.
  • it is an RRC reconfiguration message containing a synchronization reconfiguration (Reconfiguration with sync) information element.
  • RRC reconfiguration message containing a synchronization reconfiguration (Reconfiguration with sync) for the main cell group MCG.
  • Reconfigurationwithsync) information element of the RRC reconfiguration message Therefore, handover may also be called synchronous reconfiguration or synchronous reconfiguration of MCG, and handover failure may also be called synchronous reconfiguration failure of MCG.
  • the handover command is an RRC connection reconfiguration message containing a Mobility Control Information (MobilityControlInfo) information element.
  • the synchronization reconfiguration information element or the mobility control information information element may include the configuration information of the target cell, such as the target cell identity, the target cell frequency, the public configuration of the target cell such as system information, and the configuration information used by the UE to access the target cell. Random access configuration, UE security parameter configuration in the target cell, UE radio bearer configuration in the target cell, etc.
  • the RRC reconfiguration message and The RRC connection reconfiguration message is the same; its response message, the RRC reconfiguration complete message, is the same as the RRC connection reconfiguration complete message.
  • the handover command is equivalent to the RRC message containing the handover configuration, and refers to the RRC message that triggers the UE to perform handover or the configuration in the RRC message. Cancel, Release, Delete, Empty and Clear can be replaced. Execution, use and application are interchangeable. Configuration and reconfiguration can be replaced. Monitor and detect are interchangeable.
  • LTE is equivalent to Evolved Universal Terrestrial Radio Access (EUTRA) or Evolved Universal Terrestrial Radio Access Network (EUTRAN). LTE cells are also called EUTRA cells.
  • the RRC reconfiguration message used for the handover command carries the RRC configuration from the target base station, including but not limited to the following RRC configuration (for details, please refer to Chapter 6.2.2 in 3GPP Technical Standard Protocol 38.331):
  • Measurement configuration used to configure intra-frequency, inter-frequency and inter-radio access technology measurements performed by the UE. Such as measurement object configuration, measurement reporting configuration, measurement gap configuration, etc.
  • cellGroupConfig information element used to configure the primary cell group or secondary cell group.
  • RLC Radio Link Control
  • rlc-bearerToAddModList information element and rlc-bearerToreleaselist information element Radio Link Control
  • Medium Access Control Medium Access Control
  • MAC-cellgroupconfig information element physical layer configuration, secondary cell add/modify/release configuration, special cell (Special cell, SpCell) configuration, etc.
  • the SpCell configuration includes cell index number, handover information (reconfigurationWithSync information element), wireless link failure related timer and constant configuration, wireless link detection (Radio Link Monitoring, RLM) configuration, special cell-specific configuration, etc.
  • the reconfigurationwithsync information element is similar to the mobility control information in the LTE system and includes handover-related information to achieve mobility. It includes the serving cell configuration public information and the UE's cell wireless network temporary identity in the target cell C- RNTI, handover process monitoring timer T304 configuration, random access-specific configuration for the random access process to the target cell, etc.
  • RadiobearerConfig information element used to configure the service data application protocol layer (Service Data Application Protocol, SDAP) of the data radio bearer (Data Radio Bearer, DRB) and/or the signaling radio bearer (Signaling Radio Bearer, SRB) ) and the Packet Data Convergence Protocol layer (Packet Data Convergence Protocol, PDCP).
  • SDAP Service Data Application Protocol
  • DRB Data Radio Bearer
  • SRB Signaling Radio Bearer
  • Packet Data Convergence Protocol layer Packet Data Convergence Protocol layer
  • the handover process refers to the process in which the UE in the RRC connected state changes the serving cell (primary cell).
  • the general handover process includes the following stages: Stage 1: Measurement stage. The UE measures the wireless link corresponding to the serving cell or neighboring cell based on the configured measurement configuration. When the configured measurement reporting conditions are met, the UE sends a measurement report to the base station.
  • Phase 3 Switch execution phase.
  • the source base station issues the handover command to the UE, and the UE that receives the handover command immediately applies the configuration of the handover command to perform handover.
  • the UE detects the handover process through a timer T304. When the handover process is initiated, the UE starts the T304 timer; when the handover process is completed, the UE stops the timer T304; when T304 times out, the UE considers the handover failed.
  • the UE will generate and save a radio link failure report (RLF Report) when a radio link failure (Radio Link Failure, RLF) or handover failure (Handover Failure, HOF) occurs. , and save the wireless link failure information in the UE variable VarRLF-Report.
  • RLF Radio Link Failure
  • HOF Handover Failure
  • VarRLF-Report stores the failure information corresponding to the latest connection failure.
  • the UE can inform the network side that there is an available radio link failure report (such as rlf-InfoAvailable) through an RRC message. information element to indicate).
  • the network side may request the UE to report its saved radio link failure report through an RRC message (such as the rlf-ReportReq information element in the UE Information Request UEInformationRequest message to indicate the request).
  • the UE will report the saved radio link failure report (the rlf-Report information element in the UE information response UEInformationResponse message) to the network side in the response RRC message.
  • the wireless link failure report obtained by the network side is used for network optimization, such as network coverage and mobile robustness optimization.
  • the wireless link failure report contains information related to the link failure, including the measurement results of the source cell, target cell or neighbor cell when the link failure occurred, location information, the identification of the primary cell where the link failure occurred, and the type of link failure ( RLF or HOF), RLF reason, the time elapsed from connection failure to RLF report reporting (recorded as timeSinceFailure information element), the time elapsed from the last receipt of a handover command (handover initiation or handover execution) to connection failure ( (recorded as timeConnFailure information element), the time between the next time the UE enters the RRC connection state after connection failure and re-establishment process failure (recorded as timeUntilReconnection information element), RRC re-establishment cell identity, etc.
  • RLF and HOF are collectively referred to as connection failures.
  • the 3GPP network supports switching between different radio access technologies (Radio Access Technology, RAT), such as switching between LTE and NR.
  • RAT Radio Access Technology
  • the UE receives a switching command MobilityFromNRCommand (mobility command from NR) message from the source NR cell, and the switching command contains the radio resource configuration of the target LTE cell.
  • MobilityFromNRCommand mobility command from NR
  • the UE When at least one of the following situations occurs, the UE considers that a mobility failure (Mobility from NR failure) of inter RAT switching has occurred: the UE cannot successfully establish a connection with the target RAT, the timer T304 for monitoring the switching process has timed out, the UE cannot apply (comply) any part of the configuration contained in the switching command, and if the inter RAT information contained in the switching command has a protocol error, the UE fails in the switching process according to the protocol of the target RAT. When the above situation occurs, the UE saves the switching failure information of the switching failure event in the variable VarRLF-Report.
  • a mobility failure Mobility from NR failure
  • the failure information includes the connection failure type set as handover failure (hof), the failed primary cell identifier failedPCellId, the source cell identifier previousPCellId, the time timeConnFailure from receiving the MobilityFromNRCommand message to the link failure, etc.
  • the UE receives a handover command MobilityFromEUTRACommand message from the source LTE cell, and the handover command contains the radio resource configuration of the target NR cell.
  • the UE When at least one of the following situations occurs, the UE considers that a mobility failure (Mobility from EUTRAfailure) of inter-RAT handover has occurred: the UE cannot successfully establish a connection with the target RAT, the timer T304 for monitoring the handover process times out, the UE cannot apply (comply) the configuration or part of the configuration contained in the handover command, and if the inter RAT information contained in the handover command has a protocol error, the UE fails in the handover process according to the protocol of the target RAT.
  • the UE saves the handover failure information of the handover failure event in the variable VarRLF-Report.
  • the failure information includes the connection failure type set to handover failure (hof), the failed primary cell identifier failedNR-PCellId, the source cell identifier previousPCellId, the time timeConnFailure from receiving the most recent MobilityFromEUTRACommand (mobility command from EUTRA) message to the link failure, etc.
  • the UE when handover failure occurs, the UE will save the RLF report and report the report to the network side. Handover may fail due to various reasons, so that after receiving the RLF report, the network side cannot learn the specific reason for the handover failure. Then, when the network side performs mobile performance analysis based on the collected RLF reports, deviations may occur, which may further lead to inaccuracies in the adjustment and setting of mobile performance parameters. This disclosure focuses on the above issues.
  • This embodiment provides an RLF reporting method performed on the UE.
  • the UE indicates the cause of the handover failure in the RLF report of the handover failure, so that the network side can learn the handover failure cause of the handover failure event associated with the RLF report. Based on the reason, the network side decides whether to use the report for mobile routing. Optimization of stick performance parameters to avoid inaccurate adjustment of mobile performance parameters. For example, if the cause of the handover failure indicates that the handover failure is due to a protocol error configured in the handover command, then the network side may consider that the handover failure is not caused by poor link performance of the target cell, and the RLF report may not be used. Optimization of robust mobile performance.
  • FIG. 1 is a flowchart illustrating the basic process of a method performed by user equipment UE in Embodiment 1 of the present invention.
  • step S101 UE receives a handover command from the network side.
  • the switching command refers to MobilityFromNRCommand
  • MobilityFromEUTRACommand when switching from LTE to NR, the switching command refers to MobilityFromEUTRACommand.
  • this step also includes the UE performing access to the target cell according to the configuration in the handover command, and starting the handover process monitoring timer T304.
  • Step S102 Determine whether handover failure occurs.
  • the handover failure includes at least the following situations: the UE cannot successfully establish a connection with the target RAT, the timer T304 for monitoring the handover process times out, the UE cannot apply the configuration or part of the configuration included in the handover command. There is a protocol error in the inter RAT information, which causes the UE to fail in the handover process according to the protocol of the target RAT.
  • Step S103 When a handover failure occurs (that is, the determination result of step S102 is "yes"), the UE saves the handover failure information including the cause of the handover failure in the variable VarRLF-Report.
  • the handover failure reason is set as one of the reasons for handover failure based on the handover failure in step 2.
  • the handover failure reason is T304 timeout, the UE cannot apply the configuration in the handover command, and the handover command.
  • the handover failure reason field can be set to "T304 timeout” or "other".
  • the UE will include the handover failure reason field in the variable VarRLF-Report.
  • the handover failure reason field is set to "TRUE" or "1".
  • This embodiment provides a RLF information reporting method executed on the UE. Through the method described in this embodiment, the UE can report relevant information to the base station in the RLF report to provide more accurate connection failure information to the network side. This embodiment is the method of Embodiment 1 when the UE reports through the RRC process.
  • FIG. 2 is a flowchart showing the basic process of the method performed by the user equipment UE in Embodiment 2 of the present invention.
  • step S201 the UE receives a UEInformationRequest message from the network side, which carries an indication/request for requesting the UE to report a stored RLF report, such as an rlf-ReportReq field set to “true”.
  • Step S202 The UE sets the rlf-Report in the UEInformationResponse message to the rlf-Report content in its saved variable VarRLF-Report, and sends the UEInformationResponse message to the network side.
  • the rlf-Report content contained in the RRC message at least includes the field used to indicate the cause of handover failure in the aforementioned embodiment 1.
  • the above embodiment takes the inter RAT handover scenario as an example, which can be implemented in an LTE system or an NR system. It is worth noting that the above embodiments can also be applied to handover within the same RAT (intra RAT), such as handover within the NR system or handover within the LTE system.
  • the UE variable used to save or record wireless connection failure information or handover failure information takes the UE variable name VarRLF-Report in the NR system as an example, but it is not limited to this name, and other names can also be used.
  • FIG. 3 is a schematic structural block diagram showing the user equipment UE according to the present invention.
  • the user equipment UE300 includes a processor 301 and a memory 302.
  • the processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 302 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory.
  • Memory 302 stores program instructions. When this instruction is executed by the processor 301, the above-mentioned RLF information reporting method described in detail in the present invention can be executed.
  • the method and related equipment of the present disclosure have been described above in conjunction with preferred embodiments. Those skilled in the art will understand that the methods shown above are only exemplary. The method of the present disclosure is not limited to the steps and sequence shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that may be developed or developed in the future and may be used for the base station, MME, or UE, and so on.
  • the various identifications shown above are only illustrative and not restrictive, and the present disclosure is not limited to the specific information elements as examples of these identifications. Many changes and modifications may be made by those skilled in the art in light of the teachings of the illustrated embodiments.
  • the program running on the device may be a program that causes the computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or information processed by the program may 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.
  • Programs for realizing the functions of each embodiment of the present disclosure may be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing the computer system to read programs recorded on the recording medium and execute these programs.
  • the so-called “computer system” here may be a computer system embedded in the device, which 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 short-term dynamic storage program recording medium, or any other recording medium readable by a computer.
  • circuits eg, single-chip or multi-chip integrated circuits.
  • Circuitry designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • a general-purpose processor can be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit.

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

Abstract

La présente divulgation concerne un procédé mis en œuvre par un équipement utilisateur ainsi qu'un équipement utilisateur. Le procédé comprend : la réception d'une commande de transfert provenant d'un côté réseau ; la détermination si une défaillance de transfert se produit ; et lorsque la défaillance de transfert se produit, le stockage, dans un rapport variable VarRLF, d'informations de défaillance de transfert contenant une cause de défaillance de transfert.
PCT/CN2023/118784 2022-09-15 2023-09-14 Procédé mis en œuvre par un équipement utilisateur et équipement utilisateur WO2024056024A1 (fr)

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CN202211125654.8 2022-09-15
CN202211125654.8A CN117750447A (zh) 2022-09-15 2022-09-15 由用户设备执行的方法以及用户设备

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CN112584551A (zh) * 2019-09-27 2021-03-30 夏普株式会社 无线链路失败恢复方法以及用户设备
CN112954761A (zh) * 2017-04-14 2021-06-11 北京小米移动软件有限公司 用于小区切换的方法、装置及用户设备
CN113453273A (zh) * 2020-03-26 2021-09-28 夏普株式会社 无线链路失败报告方法以及用户设备
CN113825182A (zh) * 2020-06-18 2021-12-21 夏普株式会社 由用户设备执行的方法以及用户设备
CN114268977A (zh) * 2020-09-16 2022-04-01 夏普株式会社 无线链路失败报告方法以及用户设备
US20220248280A1 (en) * 2019-11-20 2022-08-04 Lg Electronics Inc. Method and apparatus for handling handover failure in wireless communication system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112954761A (zh) * 2017-04-14 2021-06-11 北京小米移动软件有限公司 用于小区切换的方法、装置及用户设备
CN112584551A (zh) * 2019-09-27 2021-03-30 夏普株式会社 无线链路失败恢复方法以及用户设备
US20220248280A1 (en) * 2019-11-20 2022-08-04 Lg Electronics Inc. Method and apparatus for handling handover failure in wireless communication system
CN113453273A (zh) * 2020-03-26 2021-09-28 夏普株式会社 无线链路失败报告方法以及用户设备
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CN114268977A (zh) * 2020-09-16 2022-04-01 夏普株式会社 无线链路失败报告方法以及用户设备

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