WO2017143828A1 - Procédé et équipement d'utilisateur permettant d'améliorer le taux de réussite des transferts - Google Patents

Procédé et équipement d'utilisateur permettant d'améliorer le taux de réussite des transferts Download PDF

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Publication number
WO2017143828A1
WO2017143828A1 PCT/CN2016/108270 CN2016108270W WO2017143828A1 WO 2017143828 A1 WO2017143828 A1 WO 2017143828A1 CN 2016108270 W CN2016108270 W CN 2016108270W WO 2017143828 A1 WO2017143828 A1 WO 2017143828A1
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WO
WIPO (PCT)
Prior art keywords
handover
msg3
ack feedback
user equipment
establishment process
Prior art date
Application number
PCT/CN2016/108270
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English (en)
Chinese (zh)
Inventor
建栋锐
Original Assignee
中兴通讯股份有限公司
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Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2017143828A1 publication Critical patent/WO2017143828A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • 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

Definitions

  • the present invention relates to the field of handover of mobile communications, and in particular, to a method and user equipment for improving handover success rate.
  • LTE Long Term Evolution
  • the basic procedure is as follows: the handover response of the target cell to the source cell carries a dedicated preamble, and is used for non-competitive random access during UE handover; After receiving the RRC connection reconfiguration message carrying the mobility control (mobilityControlInfo) field, the user equipment (User Equipment, UE for short) considers that the handover starts, starts the T304 timer, and initiates random access to the target side. The T304 timer is killed when the entry process is completed.
  • the UE and the base station also referred to as the evolved Node B, the eNB in the LTE system
  • the switching success rate is reduced.
  • the present invention provides a method and user equipment for improving the handover success rate, so as to solve the problem that the UE and the eNB have low handover success rate caused by inconsistent determination of the handover result.
  • the method for improving the handover success rate includes: during the handover, when the T304 timer expires, the user equipment UE determines whether the MSG3 has been sent; and the MSG3 includes the handover reconfiguration complete message; If it is sent, it waits for the acknowledgement ACK feedback of the MSG3; if not, it initiates a re-establishment process.
  • the foregoing ACK feedback waiting for the MSG3 includes: if the ACK feedback is received within the preset time T, it is determined that the handover is successful, and the re-establishment process is not initiated. If the ACK feedback is not received within the preset time T, it is determined that the handover fails, and the re-establishment process is initiated.
  • the preset time T is less than or equal to the time taken by the radio link control layer RLC to reach the maximum number of retransmissions.
  • the present invention further provides a user equipment for improving handover success rate, including judging a module, a re-establishment process initiating module, wherein the judging module is configured to determine whether the MSG3 has been sent when the T304 timer expires during the handover process, and notify the re-establishment process initiating module of the determination result; the MSG3 includes the handover Re-configuration completion message; when the judgment result is that the MSG3 has been sent, the re-establishment process initiating module delays re-establishment, and waits for the acknowledgement ACK feedback of the MSG3; when the judgment result is that the MSG3 is not sent, The re-establishment process initiation module initiates the re-establishment process immediately.
  • the ACK feedback is received within the preset time T, it is determined that the handover is successful, and the re-establishment process is no longer initiated. If the ACK feedback is not received within the preset time T, it is determined that the handover fails, and the re-establishment process is initiated.
  • the preset time T is less than or equal to the time taken by the radio link control layer RLC to reach the maximum number of retransmissions.
  • the above technical solution solves the problem that the UE can successfully switch in a specific case but must perform re-establishment due to the T304 timeout, so that the handover fails, the defects in the existing protocol are avoided, the probability of successful handover is improved, and the quality of the network is improved.
  • FIG. 1 is a flow chart showing the basic steps of a method for improving handover success rate according to the present invention
  • FIG. 2 is a flow chart of a method for improving handover success rate according to a first application example
  • FIG. 3 is a flow chart of a method for improving handover success rate according to a second application example
  • FIG. 4 is a flowchart of a method for improving a handover success rate according to a third application example
  • FIG. 5 is a flowchart of a method for improving handover success rate according to a fourth application example
  • FIG. 6 is a structural block diagram of a user equipment for improving handover success rate according to the present invention.
  • the end flag of the target side random access procedure is that the UE successfully decodes the random access response message (also referred to as MSG2) and receives the uplink grant.
  • the UE first sends an uplink grant (UL grant) to the bottom layer, and then marks the completion of the random access procedure. If the UE just sends the UL grant to the bottom layer, then the Radio Resource Control (RRC) connection reconfiguration complete message (also known as MSG3) is ready, and the transmission is started immediately.
  • RRC Radio Resource Control
  • FIG. 1 is a flow chart of the basic steps of a method for improving handover success rate according to the present invention. As shown in the figure, the method for improving the handover success rate of the present invention mainly includes:
  • the above-mentioned MSG3 includes a handover reconfiguration complete message, the same as below, and details are not described herein again.
  • the MSG3 of the UE has not been sent yet, indicating that the base station cannot receive the reconfiguration complete message of the handover, and the UE does not consider that the handover is successful. At this time, the UE should stop the transmission of the MSG3 and directly initiate the re-establishment process.
  • the UE does not initiate re-establishment, and waits for the radio link control layer (Radio Link Control, referred to as RLC) feedback of the reconfiguration complete message on the Signaling Radio Bearer (SRB1), if it is at the preset time T. If the RLC ACK feedback is received, the base station has considered that the UE is successfully handed over, and is about to allocate resources for the UE.
  • RLC Radio Link Control
  • the UE abandons the re-establishment, sets the state to be successful, and continues to process the uplink and downlink data transmission in the target cell. If the RLC ACK feedback of the reconfiguration complete message is not received within the preset time T, the base station does not receive the reconfiguration complete message. At this time, the UE and the base station side are in the same state, and the handover is considered to be failed. Initiate the re-establishment process.
  • the preset time T may be set to be less than or equal to the time taken by the RLC to reach the maximum number of retransmissions according to the requirement of the network delay.
  • the problem that the handover success of the UE can be performed but the handover fails due to the T304 timeout is solved, the probability of successful handover is improved, and the quality of the network is improved.
  • the method for improving the handover success rate in this example includes the following steps:
  • the UE receives the handover command sent by the source base station, and starts the T304 timer; the T304 timer duration is set according to the existing protocol;
  • S202 The UE initiates a random access procedure, and sends a random access preamble (referred to as: MSG1) to the target base station.
  • MSG1 random access preamble
  • S203 The UE receives the MSG2 from the target base station
  • FIG. 3 is a flowchart of a method for improving handover success rate according to a second application example. As shown in the figure, the method for improving the handover success rate in this example includes the following steps:
  • S301 The UE receives the handover command sent by the source base station, and starts the T304 timer.
  • S302 The UE performs a random access procedure, and sends the MSG1 to the target base station.
  • S303 The UE receives the MSG2 from the target base station
  • S304 The UE sends the MSG3 to the target base station.
  • S306 Receive the foregoing ACK feedback within the preset time T, determine that the handover is successful, and set the state to be successfully switched.
  • the preset time T is less than or equal to the time taken by the RLC to reach the maximum number of retransmissions.
  • the method for improving the handover success rate in this example includes the following steps:
  • S401 The UE receives the handover command sent by the source base station, and starts the T304 timer.
  • S402 The UE performs a random access procedure, and sends the MSG1 to the target base station.
  • S403 The UE receives the MSG2 from the target base station
  • S404 The UE sends the MSG3 to the target base station.
  • the ACK feedback is not received within the preset time T, determining that the handover fails, and initiating a re-establishment process.
  • the preset time T is less than or equal to the time taken by the RLC to reach the maximum number of retransmissions.
  • FIG. 5 is a flowchart of a method for improving handover success rate according to a fourth application example. As shown in the figure, the method for improving the handover success rate in this example includes the following steps:
  • S501 The UE receives the handover command sent by the source base station, and starts the T304 timer.
  • S502 The T304 timer expires, the UE determines whether the MSG3 has been sent; if it has been sent, it jumps to S503; otherwise, it jumps to S504;
  • step S503 Waiting for the ACK feedback of the MSG3; if the ACK feedback is received within the preset time T, determining that the handover is successful; if the ACK feedback is not received within the preset time T, then the process proceeds to step S504;
  • the preset time T is less than or equal to the time taken by the RLC to reach the maximum number of retransmissions.
  • FIG. 6 is a block diagram of a component of a user equipment for improving handover success rate according to the present invention.
  • the user equipment includes: a judging module 01, and a re-establishment process initiating module 02; wherein the judging module 01 is configured to determine whether the MSG3 has been sent when the T304 timer expires during the handover, and notify the re-establishment of the judgment result.
  • the process initiating module 02 when the result of the determination is that the MSG3 has been sent, the re-establishment process initiating module 02 delays the initiation of re-establishment, and waits for the acknowledgement ACK feedback of the MSG3; when the determination result is that the MSG3 is not sent, the re-establishment process is initiated. Module 02 immediately initiates the re-establishment process.
  • the above ACK feedback waiting for MSG3 includes:
  • the handover state is set to be successfully switched, and the re-establishment process is no longer initiated. If the ACK feedback is not received within the preset time T, the handover state is set to the handover failure, and the re-establishment process is initiated.
  • the preset time T is less than or equal to the time taken by the radio link control layer RLC to reach the maximum number of retransmissions.
  • the present invention is applicable to the handover field of mobile communication, and is used to improve the probability of successful handover and improve the quality of the network.

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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 le domaine du transfert des communications mobiles et, en particulier, un procédé et un équipement d'utilisateur (UE) permettant d'améliorer le taux de réussite des transferts. Le procédé permettant d'améliorer le taux de réussite des transferts comprend les étapes suivantes : durant un transfert intercellulaire, un UE détermine si MSG3 a été envoyé lorsqu'un temporisateur T304 est écoulé, le MSG3 contenant un message de terminaison de reconfiguration de transfert ; si le MSG3 a été envoyé, attendre le renvoi de l'accusé de réception (ACK) du MSG3 ; sinon, lancer une procédure de rétablissement. La présente invention concerne également un UE permettant d'améliorer un taux de réussite des transferts. (FIG. 1)
PCT/CN2016/108270 2016-02-26 2016-12-01 Procédé et équipement d'utilisateur permettant d'améliorer le taux de réussite des transferts WO2017143828A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610112579.X 2016-02-26
CN201610112579.XA CN107135522A (zh) 2016-02-26 2016-02-26 一种提高切换成功率的方法和用户设备

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WO2017143828A1 true WO2017143828A1 (fr) 2017-08-31

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KR102637660B1 (ko) 2018-06-29 2024-02-19 삼성전자주식회사 무선 통신 시스템에서 데이터를 송수신하는 방법 및 장치
CN110753376A (zh) * 2018-07-23 2020-02-04 中兴通讯股份有限公司 无线接入方式切换方法、基站、终端和可读存储介质
CN111918352A (zh) * 2020-08-06 2020-11-10 Oppo广东移动通信有限公司 小区切换方法、装置、终端及存储介质

Citations (5)

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Publication number Priority date Publication date Assignee Title
CN102769849A (zh) * 2012-07-25 2012-11-07 中兴通讯股份有限公司 消息发送方法及装置
WO2013039435A1 (fr) * 2011-09-16 2013-03-21 Telefonaktiebolaget L M Ericsson (Publ) Procédure améliorée d'accès aléatoire sans conflit dans les réseaux sans fil
CN103200627A (zh) * 2012-01-04 2013-07-10 中兴通讯股份有限公司 一种解决切换过程中重建立冲突的方法及移动终端
CN103298048A (zh) * 2012-03-05 2013-09-11 中兴通讯股份有限公司 一种减少切换过程中rrc连接重建立次数的方法和终端
WO2015051486A1 (fr) * 2013-10-07 2015-04-16 Qualcomm Incorporated Conception de plan de montage chronologique de message rach msg3 en eimta

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013039435A1 (fr) * 2011-09-16 2013-03-21 Telefonaktiebolaget L M Ericsson (Publ) Procédure améliorée d'accès aléatoire sans conflit dans les réseaux sans fil
CN103200627A (zh) * 2012-01-04 2013-07-10 中兴通讯股份有限公司 一种解决切换过程中重建立冲突的方法及移动终端
CN103298048A (zh) * 2012-03-05 2013-09-11 中兴通讯股份有限公司 一种减少切换过程中rrc连接重建立次数的方法和终端
CN102769849A (zh) * 2012-07-25 2012-11-07 中兴通讯股份有限公司 消息发送方法及装置
WO2015051486A1 (fr) * 2013-10-07 2015-04-16 Qualcomm Incorporated Conception de plan de montage chronologique de message rach msg3 en eimta

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