WO2018059299A1 - Procédé, dispositif et système de transfert intercellulaire, et support de stockage informatique - Google Patents

Procédé, dispositif et système de transfert intercellulaire, et support de stockage informatique Download PDF

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Publication number
WO2018059299A1
WO2018059299A1 PCT/CN2017/102685 CN2017102685W WO2018059299A1 WO 2018059299 A1 WO2018059299 A1 WO 2018059299A1 CN 2017102685 W CN2017102685 W CN 2017102685W WO 2018059299 A1 WO2018059299 A1 WO 2018059299A1
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Prior art keywords
cell
handover
target cell
source
target
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PCT/CN2017/102685
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English (en)
Chinese (zh)
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吴昱民
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中兴通讯股份有限公司
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    • 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
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, device and system for cell handover and a computer storage medium.
  • a dual connectivity (DC) function is introduced in a Long Term Evolution (LTE) system, and the DC includes two cell groups: an MCG (Master Cell Group) and an SCG ( Secondary Cell Group, secondary cell group).
  • the MCG includes one primary cell (PCell) or additionally includes one or more secondary cells (SCells), and the SCG includes one primary secondary cell (PSCell) or additionally includes one or more SCells.
  • the base station that manages the MCG is called a master base station (MeNB), and the base station that manages the SCG is called a secondary base station (Secondary eNB, SeNB).
  • MeNB master base station
  • SeNB secondary base station
  • the mobility procedure of the related art UE includes a handover method for maintaining a connection between a source and a target cell
  • the LTE system in the related art adopts a handover method in which a source cell is disconnected first, and then a connection is established in the target cell (ie, Break-before-make, first created after the interrupt).
  • the transmission and reception of business data will be interrupted. Therefore, the 3GPP discussion group provides a new scheme for simultaneously maintaining the UE's connection between the source cell and the target cell (ie, make-before-break, first establishment and then interrupt) for reducing the UE side handover interruption delay. That is, the UE remains connected to the source base station after receiving the handover command, and disconnects from the source base station before or after accessing the target base station.
  • FIG. 1 is a schematic diagram of a handover in a related art according to the present invention.
  • a random response (RAR) message (standard definition) carries a Cell Radio Network Temporary Identifier (C-RNTI).
  • C-RNTI Cell Radio Network Temporary Identifier
  • the cell handover of the UE may include:
  • the UE reports the measurement report
  • the source base station sends a handover request to the target base station according to the measurement report;
  • the target base station receives the handover request of the source base station, and sends a handover request acknowledgement to the source base station;
  • the source base station After receiving the handover request acknowledgement, the source base station sends a radio resource control (RRC) connection reconfiguration message to the UE;
  • RRC radio resource control
  • the UE After receiving the RRC connection reconfiguration message, the UE maintains a connection with the source cell;
  • the UE initiates a random access request (PRACH) to the target base station;
  • PRACH random access request
  • the source base station releases the UE context.
  • the UE stops the detection of the physical layer radio link after receiving the handover command, and the data layer cannot be sent or received even if the physical layer has an error while maintaining the connection of the source base station.
  • the data recovery process cannot be triggered in time, resulting in more data transmission interruption.
  • the UE needs to detect and receive the downlink control channel before sending the uplink data to the target cell. Since the UE cannot simultaneously support data transmission and reception in the source and the target cell, the UE may be disconnected from the source base station in advance, causing more data transmission interruption. . In view of the above problems in the related art, no effective solution has been found yet.
  • the embodiments of the present invention provide a method, a device, and a system for cell handover, which at least solve the technology in the related art that the data recovery process cannot be triggered in time when the physical layer fails to send and receive data during the cell handover process. problem.
  • a method for cell handover including: instructing a user equipment UE to perform cell handover or a supplementary cell group change; instructing the UE to maintain a connection with a source cell, and instructing the UE to The source cell performs detection of a wireless link.
  • a method for another cell handover is provided, that is: the user equipment UE receives indication information for indicating a cell handover or a supplementary cell group change; the UE is performing a cell handover or a supplementary cell group.
  • the connection with the source cell is maintained, and the UE performs radio link detection on the source cell.
  • a device for cell handover which is applied to a source base station or a primary base station, and includes:
  • a first indication module configured to instruct the user equipment UE to perform cell handover or a supplementary cell group change
  • the second indication module is configured to instruct the UE to maintain a connection with the source cell, and instruct the UE to perform a radio link to the source cell Detection.
  • a cell switching system including a network side device and a user equipment UE, where the network side device includes any device that is applied to the network side device, and the UE includes the foregoing application. Any device at the UE.
  • a computer storage medium stores computer executable instructions for performing the cell switching method provided by any one of the above technical solutions.
  • the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs.
  • the technical problem that the data recovery process cannot be triggered in time when the data is sent or received is interrupted.
  • FIG. 2 is a flowchart of a method for cell handover according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for cell handover according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of an apparatus for cell handover according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of another apparatus for cell handover according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a system for cell handover according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of handover when a cell is switched according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of handover when the SeNB is changed according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for cell handover according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:
  • Step S202 instructing the user equipment UE to perform cell handover or auxiliary cell group change
  • Step S204 instructing the UE to maintain the connection with the source cell, and instructing the UE to perform detection of the radio link on the source cell that is handed over.
  • the source cell of the handover that is, the aforementioned source cell.
  • the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs.
  • the technical problem that the data transmission interruption cannot be triggered in time when the physical layer fails to send and receive data during the cell handover process in the related art is solved.
  • the execution body of the foregoing steps may be a network side, such as a core network device, an access network device, such as a base station, a source base station, a primary base station, and the like, but is not limited thereto.
  • a network side such as a core network device, an access network device, such as a base station, a source base station, a primary base station, and the like, but is not limited thereto.
  • the method further includes: indicating time information that the UE listens to and receives the downlink control channel in the target cell; and/or indicates that the UE is in the target cell monitoring and receiving downlink. Time information of the data channel. The time for data interruption is reduced by controlling the point in time at which the UE receives the target cell control or data channel.
  • This embodiment includes two optional application scenarios, cell handover and auxiliary cell group change.
  • the UE's mobility may cause the UE to switch between different cells, and the auxiliary cell group change may also trigger the UE to switch between different cells.
  • the method can include:
  • the step S202 may include:
  • the handover response message may carry information indicating that the UE performs cell handover.
  • the method further includes:
  • S21 Send an add request message to the target secondary cell, where the add request message carries indication information used to indicate that the UE keeps a connection with the source secondary cell when performing the auxiliary cell group change;
  • the step S202 may include:
  • FIG. 3 is a flowchart of another method for cell handover according to an embodiment of the present invention. As shown in FIG. 3, the process may include the following steps:
  • Step S302 The user equipment UE receives indication information for indicating a cell handover or a secondary cell group change.
  • Step S304 When performing cell handover or auxiliary cell group change, the UE maintains a connection with the source cell and performs radio link detection on the source cell.
  • condition that the UE determines to perform the detection of the wireless link includes at least one of the following:
  • the timer that initiates the switch failure detection fails.
  • the timer for starting the detection of the failure of the secondary cell group failure fails
  • the startup failure in this implementation may be that the UE does not start the timer after completing the access, or the startup is not successful, and other actions, such as reset, re-establish, and send, are similar.
  • the detecting, by the UE, the radio link of the source cell includes at least one of the following actions: starting a radio link problem detection timer when a radio link problem occurs; when a radio link problem occurs , a counter that initiates wireless link problem detection; when the wireless link is restored, a counter for wireless link recovery is initiated.
  • the method further includes: detecting, by the UE, a channel of the target cell, where the channel of the target cell includes at least one of a downlink control channel and a data channel.
  • the triggering condition that the UE detects and receives the channel of the target cell includes at least one of the following:
  • k is a positive integer. Specifically, k is the value agreed by the protocol or the value of the network configuration.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM, including a number of instructions to make a terminal device (can It is a mobile phone, a computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.
  • a device and a system for the cell handover are also provided.
  • the device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 4 is a structural block diagram of an apparatus for cell handover according to an embodiment of the present invention. As shown in FIG. 4, the method may be applied to a source base station or a primary base station, a source secondary base station, or a source macro base station on a network side, including:
  • the first indication module 40 is configured to instruct the user equipment UE to perform cell handover or auxiliary cell group change
  • the second indication module 42 is configured to instruct the UE to maintain the connection with the source cell, and instruct the UE to perform detection of the radio link of the source cell.
  • the device further includes at least one of the third indication module and the fourth indication module:
  • the third indication module is configured to: after the first indication module instructs the user equipment UE to perform a cell handover or a secondary cell group change, instructing the UE to monitor and receive time information of the downlink control channel in the target cell;
  • the fourth indication module is configured to instruct the UE to monitor and receive time information of the downlink data channel in the target cell after the first indication module indicates that the user equipment UE performs the cell handover or the auxiliary cell group change.
  • FIG. 5 is a structural block diagram of another apparatus for cell handover according to an embodiment of the present invention. As shown in FIG. 5, the apparatus may be applied to a user equipment UE, but is not limited to a UE handover apparatus.
  • Can include:
  • the receiving module 50 is configured to receive, to indicate, performing cell handover or auxiliary cell group change. Indication information;
  • the processing module 52 is configured to maintain a connection with the source cell and perform a radio link detection on the source cell when performing cell handover or auxiliary cell group change.
  • the processing module determines that the condition for performing the detection of the wireless link includes at least one of the following:
  • the timer that initiates the switch failure detection fails.
  • the timer for starting the detection of the failure of the secondary cell group failure fails
  • the device further includes: a detecting module, configured to detect, after the processing module performs the radio link detection on the source cell, the downlink control channel and/or the data channel of the receiving target cell.
  • a detecting module configured to detect, after the processing module performs the radio link detection on the source cell, the downlink control channel and/or the data channel of the receiving target cell.
  • the detecting condition that the detecting module detects the downlink control channel and/or the data channel of the receiving target cell includes at least one of the following:
  • k is a positive integer.
  • FIG. 6 is a structural block diagram of a system for cell handover according to an embodiment of the present invention. As shown in FIG. 6, the network side device 60 and the user equipment UE 62 are included.
  • the network side device includes: a first indication module 602, configured to instruct the user equipment UE to perform cell handover or a supplementary cell group change; the second indication module 604 is configured to instruct the UE to maintain the connection with the source cell, and instruct the UE to perform the source cell
  • the detection of the wireless link may be a base station, specifically including a source cell and a target cell;
  • the UE 62 includes: a receiving module 622, configured to receive indication information for indicating cell handover or a supplementary cell group change; and a processing module 624 configured to maintain a connection with the source cell when performing cell handover or auxiliary cell group change, And detecting the wireless link of the source cell.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • This embodiment is an optional embodiment according to the present invention, which is used to describe the present application in detail in conjunction with a specific scenario:
  • the embodiment provides a process for changing a serving base station (cell) to a UE in an LTE system, including single connection switching; dual connection switching; adding and changing a secondary base station under dual connectivity, and the UE still needs to maintain the source base station for a period of time.
  • the connection indicates the processing behavior of a specific UE through the network, thereby reducing the service interruption delay and packet loss of the UE.
  • the technical problem to be solved in this embodiment is that in the make-before-break scheme in the related art, since it is not determined that the UE stops the detection of the physical layer radio link after receiving the handover command, the connection of the source base station is maintained. In the process, even if the physical layer fails to send and receive data, the data recovery process cannot be triggered in time, resulting in more data transmission interruption.
  • the UE needs to detect and receive the downlink control channel before sending the uplink data to the target cell. Since the UE cannot simultaneously support data transmission and reception in the source and the target cell, the UE may be disconnected from the source base station in advance, causing more data transmission interruption. .
  • Example 1 Cell handover, source base station cell (Source eNB) to target base station cell (TargeteNB)
  • FIG. 7 is a schematic diagram of handover when a cell is switched according to an embodiment of the present invention, including:
  • Step 1 The source base station sends a handover request message to the target base station, including indication information that is kept connected to the source base station. (as indicated by the remainingConnection in the Handover Request message in step 1)
  • Step 2 After receiving the handover request, the target base station carries the RRC message for the UE handover in the handover response message, and carries the indication information that the source base station remains connected in the RRC message. (as indicated by the remainingConnection in the Handover Request Acknowledge message in step 2)
  • Step 3 After receiving the handover command, the UE maintains a connection with the source base station. (as indicated by the remainingConnection in the RRCConnectionReconfiguration message in step 3)
  • Step 3.1 The UE determines to perform radio link detection according to the following conditions:
  • the MAC entity of the UE is not reset or re-established
  • the RLC entity of the UE is not reset or re-established
  • the PDCP entity of the UE is not reset or re-established
  • the UE performs the detection of the wireless link as performing at least one of the following behaviors:
  • a timer that initiates wireless link problem detection (such as T310) when a wireless link problem occurs;
  • Step 3.2 The triggering condition for the UE to start detecting the downlink control channel and/or the data channel of the receiving target cell includes:
  • the UE completes downlink synchronization with the target cell
  • Step 4 The UE disconnects from the source base station, and receives downlink data and control information at the target base station.
  • the UE receives a physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) or a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH for short) in the target cell.
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • Step 5 The UE disconnects from the source base station, and sends uplink data and control information at the target base station. (In step 5, the UE sends a Physical Random Access Channel (PRACH) or PUSCH channel in the target cell).
  • PRACH Physical Random Access Channel
  • Example 2 SeNB change, source secondary base station cell (S-SeNB) to target secondary base station cell (T-SeNB)
  • FIG. 8 is a schematic diagram of handover when the SeNB is changed according to an embodiment of the present invention, including:
  • Step S1 The primary base station sends an add request message to the target secondary base station, and carries indication information that needs to be kept connected at the source secondary base station. (as indicated by the keepConnection indication in the SeNB Addition Request message in step S1)
  • Step S2 The target secondary base station sends an add request response message to the primary base station, where the response message carries the RRC configuration information for the SCG change of the UE, and carries the indication information that the source secondary base station remains connected in the RRC configuration information.
  • the SeNB adds a reservation connection (remainConnection) in the Addition Request Acknowledge message. Instructions)
  • Step S3 The primary base station notifies the source secondary base station to initiate a data pre-transmission process. (SME reconfiguration message in step S3)
  • Step S4 After receiving the SCG change command, the UE maintains a connection with the source secondary base station. (such as the keepConnection in the RCC reconnection configuration (RRCConnectionReconfiguration) message in step S4
  • Step S4.1 The UE determines to perform radio link detection according to the following conditions:
  • the MAC entity of the UE is not reset or re-established
  • the RLC entity of the UE is not reset or re-established
  • the PDCP entity of the UE is not reset or re-established
  • the UE performs the detection of the wireless link as performing at least one of the following behaviors:
  • a timer for detecting a wireless link problem (such as T313) is started;
  • Step S4.2 The triggering condition for the UE to start detecting the downlink control channel and/or the data channel of the receiving target cell includes:
  • the UE completes downlink synchronization with the target cell
  • Step S5 The UE feeds back a configuration completion message to the primary base station.
  • the RRC Connection Reconfiguration Complete message (RRCConnectionReconfigurationComplete) message.
  • the RRC is an abbreviation of Radio Resource Control, and corresponds to radio resource connection control.
  • Step S6 The primary base station notifies the target base station that the UE configuration is completed. (As in step S6, the SeNB Reconfiguration Complete message).
  • Step S7 The UE disconnects from the source secondary base station, and receives downlink data and control information at the target secondary base station. (The UE receives the PDCCH or PDSCH channel in the target cell as in step S7).
  • Step S8 The UE disconnects from the source secondary base station, and sends uplink data and control information to the target secondary base station. (In step S8, the UE transmits a PRACH or PUSCH channel in the target cell).
  • the wireless link detection can be initiated, and the wireless link reply can be quickly performed when the wireless link problem occurs.
  • the time for data interruption is reduced by controlling the point in time at which the UE receives the target cell control or data channel.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store computer executable code such as program code for performing the following steps; after the computer executable code is executed by a processor or the like, the foregoing one can be implemented.
  • the method for cell handover provided by multiple technical solutions may, for example, at least perform the following steps:
  • the connection with the source cell is maintained, and the source cell is detected by the radio link.
  • the foregoing computer storage medium may include but is not limited to: U.
  • a medium that can store program code such as a disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk.
  • the Sohu computer storage medium may be a non-transitory storage medium or a non-volatile storage medium.
  • the embodiment of the present invention provides a communication device, which may be a base station or a UE, including: a memory and a processor connected to the memory, and the processor and the memory may be connected through a bus interface such as an integrated circuit bus, the processor
  • a method of handover of a cell provided by one or more of the foregoing technical solutions may be implemented by executing computer executable code on a memory.
  • the processor may be: an application processor (AP), a central processing unit (CPU), a digital signal processor (DSP), or a programmable gate array (FPGA, Field Programmable). Gate Array) or ASIC, quantum calculator or photon calculator.
  • AP application processor
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA programmable gate array
  • ASIC quantum calculator or photon calculator.
  • the processor performs, according to the stored program code stored in the storage medium, receiving indication information for indicating that the cell handover or the auxiliary cell group change is performed;
  • the processor performs, according to the stored program code in the storage medium, maintains a connection with the source cell when performing cell handover or the change of the secondary cell group, and performs detection of the wireless link of the source cell. .
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or multiple of them Blocks or steps are made in a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the UE when the UE performs handover between the source base station and the target base station, the UE not only maintains the connection with the source cell, but also facilitates the UE to perform data transmission during the handover process, and simultaneously performs wireless connection to the source cell.
  • the link is detected. In this way, it is timely to find out whether the connection between the UE and the source cell is interrupted. If a terminal phenomenon occurs, data recovery can be triggered in time, thereby reducing the middle segment of the data caused by the failure of the link.
  • the resulting data loss problem therefore, it has the beneficial effects of less data loss and less loss of data and strong data transmission reliability. At the same time, it is industrially achievable.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé, un dispositif et un système de transfert intercellulaire. Ledit procédé consiste à : ordonner à un équipement d'utilisateur (UE) d'effectuer un transfert intercellulaire ou un changement de groupe de cellules secondaires; et ordonner à l'UE de maintenir une connexion avec une cellule source, et ordonner à l'UE de détecter une liaison sans fil de la cellule source. Un mode de réalisation de la présente invention concerne un support de stockage informatique.
PCT/CN2017/102685 2016-09-29 2017-09-21 Procédé, dispositif et système de transfert intercellulaire, et support de stockage informatique WO2018059299A1 (fr)

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CN201610871754.3A CN107889172A (zh) 2016-09-29 2016-09-29 小区切换的方法、装置及系统

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WO2020089511A1 (fr) * 2018-11-01 2020-05-07 Nokia Technologies Oy Réduction d'interruption de transfert avec deux émetteurs et récepteurs
CN111436073A (zh) * 2019-02-14 2020-07-21 维沃移动通信有限公司 确定方法及设备
CN112105092A (zh) * 2019-06-17 2020-12-18 中兴通讯股份有限公司 双连接重建立中数据的处理方法及装置
KR20210066868A (ko) * 2018-09-28 2021-06-07 다탕 모바일 커뮤니케이션즈 이큅먼트 코포레이션 리미티드 링크 스위칭 방법, 네트워크 엔티티 및 단말

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US11202237B2 (en) * 2018-07-24 2021-12-14 Mediatek Inc. Method for preventing an inter-rat change from being triggered and communications apparatus utilizing the same
WO2020061966A1 (fr) * 2018-09-27 2020-04-02 华为技术有限公司 Procédé et appareil de transmission de données
CN116156589A (zh) * 2018-09-28 2023-05-23 大唐移动通信设备有限公司 一种链路释放方法、装置、终端及第二网络实体
CN109548107B (zh) * 2019-01-18 2021-09-21 中国科学院上海高等研究院 基于通信网络双连接切换的方法、系统、介质及设备
JP7403988B2 (ja) * 2019-08-08 2023-12-25 シャープ株式会社 端末装置、方法、および、集積回路
US11317331B2 (en) * 2019-08-13 2022-04-26 Qualcomm Incorporated Uplink switching for enhanced mobility
CN114430578A (zh) * 2020-10-29 2022-05-03 维沃移动通信有限公司 辅小区组信息的配置、获取方法及通信设备
CN114641082A (zh) * 2020-12-16 2022-06-17 夏普株式会社 小区变更方法以及用户设备

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