WO2012103719A1 - 无线链路重建方法及控制器 - Google Patents

无线链路重建方法及控制器 Download PDF

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Publication number
WO2012103719A1
WO2012103719A1 PCT/CN2011/076555 CN2011076555W WO2012103719A1 WO 2012103719 A1 WO2012103719 A1 WO 2012103719A1 CN 2011076555 W CN2011076555 W CN 2011076555W WO 2012103719 A1 WO2012103719 A1 WO 2012103719A1
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
controller
base station
search
Prior art date
Application number
PCT/CN2011/076555
Other languages
English (en)
French (fr)
Inventor
沈志超
游钦文
刘勇
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/076555 priority Critical patent/WO2012103719A1/zh
Priority to EP11857949.9A priority patent/EP2713659B1/en
Priority to CN201180000852.5A priority patent/CN102232314B/zh
Publication of WO2012103719A1 publication Critical patent/WO2012103719A1/zh
Priority to US14/140,115 priority patent/US9781763B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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
    • 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

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a wireless link reconstruction method and a controller. Background technique
  • the signal strength of the cell currently serving the UE suddenly drops with the movement of the User Equipment (UE) in the cell-specific channel (CELL_DCH) state.
  • the Radio Network Controller RNC
  • the Radio Network Controller cannot time to handover the UE to the new cell in time, and the current cell is unable to provide services for the UE.
  • the RNC may release the message.
  • the radio resource control (RRC) connection of the UE causes the communication service failure performed by the UE, for example: dropped calls, thereby reducing the reliability of the communication service. Similar problems exist in other communication systems. Summary of the invention
  • the embodiment of the invention provides a method and a controller for reestablishing a wireless link, which are used to improve the reliability of the communication service and ensure the normal operation of the communication service.
  • a method for reestablishing a wireless link including:
  • the controller sends the corresponding number of downlink signaling or downlink data, the corresponding acknowledgment returned by the user equipment in the cell-specific channel state is not received, or the controller receives the wireless information sent by the base station corresponding to the user equipment. a link failure indication message, the controller instructing the user to set Re-search for the cell;
  • the controller receives a cell update message sent by the user equipment in a cell that meets a cell selection preset condition
  • the controller re-establishes a wireless link for the user equipment.
  • a controller including:
  • the indicating unit is configured to: if the controller sends the specified number of times of downlink signaling or downlink data, does not receive a corresponding acknowledgement returned by the user equipment in the cell-dedicated channel state, or the controller receives the corresponding a radio link failure indication message sent by the base station of the user equipment, instructing the user equipment to re-search for a cell;
  • a receiving unit configured to receive a cell update message sent by the user equipment in a cell that meets a cell selection preset condition
  • an establishing unit configured to re-establish a wireless link for the user equipment.
  • the radio link failure indication message may be used by the controller in the embodiment of the present invention to instruct the user equipment to re-search the cell to trigger the cell update procedure, which may avoid the RRC connection of the user equipment released by the controller in the prior art.
  • the communication service performed by the user equipment fails, which improves the reliability of the communication service, thereby ensuring the normal operation of the communication service.
  • FIG. 1 is a schematic flowchart of a method for reestablishing a wireless link according to an embodiment of the present invention
  • 2 is a schematic flowchart of a method for reestablishing a radio link according to another embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a method for reestablishing a radio link according to another embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a controller according to another embodiment of the present invention. detailed description
  • GSM Global System for Mobile Communications
  • GPRS General Packet Radio Service
  • CDMA Code Division Multiple Access
  • WCDMA Wi-band Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • the base station may be a GSM system, a GPRS system, or a base station (BTS) in a CDMA system, or may be a base station (N odeB) in a WCDMA system.
  • the present invention is not limited, but is convenient for description.
  • the following embodiment uses the NodeB as an example for description.
  • the controller may be a base station controller (BSC) in a GSM system, a GPRS system, or a CDMA system, or may be a radio network controller (RNC) in a WCDMA system.
  • BSC base station controller
  • RNC radio network controller
  • Invention is not limited However, for convenience of description, the following embodiments are described by taking RNC as an example.
  • FIG. 1 is a schematic flowchart of a method for reestablishing a radio link according to an embodiment of the present invention. As shown in FIG. 1 , a method for reestablishing a radio link in this embodiment may include:
  • the RNC does not receive the corresponding acknowledgment returned by the UE in the CELL_DCH state after transmitting the specified number of downlink signaling or downlink data, or the RNC receives the radio link failure indication sent by the NodeB corresponding to the UE (RADIO) LINK FAILURE INDICATION ) message, the foregoing RNC instructs the UE to re-search for a cell;
  • the RNC does not receive the corresponding acknowledgment returned by the UE in the CELL_DCH state after transmitting the specified number of downlink signaling or downlink data, the signal quality between the RNC and the UE is deteriorated, and the communication service cannot be performed.
  • the RNC detects a Down Signaling Radio Bear (SRB) reset or a Traffic Radio Bear (TRB) reset, and the RNC instructs the UE to re-search for a cell; or NodeB detects If the uplink radio link between the UE in the CELL_DCH state and the NodeB is out of synchronization, the RNC receives a RADIO LINK FAILURE INDICATION message sent by the NodeB, and the RNC instructs the UE to re-search for the cell. .
  • SRB Down Signaling Radio Bear
  • TRB Traffic Radio Bear
  • the RNC may instruct the UE to re-search for a cell in multiple manners.
  • the RNC may send the radio link transmitter indication information to the NodeB to instruct the NodeB to disable the radio link transmitter corresponding to the UE to trigger the UE to re-search for the cell.
  • the NodeB closes the radio link transmitter corresponding to the UE according to the indication information, that is, no longer sends any signal to the UE.
  • the UE may be triggered to re-search for the cell. For example, the UE detects that the downlink radio link is out of synchronization, or if the UE does not receive the corresponding acknowledgement returned by the RNC after transmitting the specified number of uplink signaling or uplink data, the UE searches for the cell again.
  • the above-mentioned wireless link transmitter indication information may be carried by a new message, and the above-mentioned closed wireless link transmitter indication information may be carried by modifying an existing message, for example: the wireless link activation command may be activated (RADIO LINK)
  • the ACTIVE COMMAND ) message carries the above-mentioned off-wireless transmitter indication information.
  • the RNC may send the search cell indication information to the UE by using the NodeB, to indicate that the UE searches for a cell again. According to the indication information, the UE searches for the cell again.
  • the RNC may be configured to instruct the UE to re-search for a cell by carrying the search cell indication information in different positions of a frame protocol (Frame Protocol, FP for short) frame sent to the NodeB.
  • a frame protocol Frae Protocol, FP for short
  • the RNC carries the search cell indication information in the payload of the FP frame, and the NodeB does not parse the search cell indication information in the payload, and transparently transmits the indication information to the UE, to indicate that the UE searches for the cell again; for another example:
  • the RNC carries the search cell indication information in the header of the FP frame, and the NodeB parses the search cell indication information in the header, and then forwards the indication information to the UE, to instruct the UE to re-search for the cell.
  • the foregoing RNC receives a cell update (CELL UPDATE) message sent by the UE in a cell that meets a cell selection preset condition.
  • CELL UPDATE cell update
  • the cell update message received by the RNC carries a cause value for indicating a RADIO LINK FAILURE.
  • the method for selecting a cell that meets the cell selection preset condition may include multiple methods, for example, selecting, in a cell with a signal strength greater than or equal to a preset intensity threshold, randomly selecting a cell; for example: the signal strength is greater than The cell with the highest signal strength is selected among all the cells that are equal to the preset strength threshold.
  • the foregoing RNC re-establishes a wireless link for the UE.
  • the RNC may delete the radio link previously established for the UE and re-establish a new radio link for the UE.
  • the controller may Pass Instructing the UE to re-search the cell to trigger the cell update procedure, which can avoid the communication service failure of the UE caused by the RRC connection of the user equipment released by the controller in the prior art, so that the reliability of the communication service is improved. Thereby ensuring the normal operation of the communication service.
  • FIG. 2 is a schematic flowchart diagram of a method for reestablishing a wireless link according to another embodiment of the present invention.
  • the radio link reconstruction method in this embodiment may include:
  • the RNC sends a RADIO LINK ACTIVE COMMAND message to the NodeB, where the radio link activation command message includes radio link transmitter indication information, and is used to instruct the NodeB to disable the radio link transmitter corresponding to the UE. ;
  • the RNC does not receive the corresponding acknowledgment returned by the UE after transmitting the specified number of downlink signaling or downlink data, or the RNC receives the radio link failure indication message sent by the NodeB corresponding to the UE.
  • the RNC sends the above radio link activation command to the NodeB.
  • the NodeB closes the radio link transmitter corresponding to the UE.
  • the NodeB no longer sends any signal to the UE to trigger the UE to re-search for the cell.
  • the UE detects the downlink radio link loss because the NodeB does not send any signal to the UE, or re-searches the cell if the UE does not receive the acknowledgement returned by the RNC after sending the specified number of uplink signaling or uplink data.
  • the UE sends a cell update (CELL UPDATE) message to the RNC through a NodeB in a cell that meets a cell selection preset condition, where the cell update message carries a cause value, indicating a radio link out-of-step (RADIO LINK FAILURE).
  • a cell update CELL UPDATE
  • the cell update message carries a cause value, indicating a radio link out-of-step (RADIO LINK FAILURE).
  • the RNC identifies, according to the cell update message, the cell where the UE is located, and sends a RADIO LINK DELETE REQUEST message to the NodeB, where the radio link deletion request message includes the identity information of the UE.
  • the NodeB deletes the radio link established by the UE, and sends a radio link deletion response (RADIO LINK DELETE RESPONSE) message to the RNC.
  • RADIO LINK DELETE RESPONSE radio link deletion response
  • the wireless link established by the NodeB for the UE can be deleted.
  • the RNC sends a RADIO LINK SETUP REQUEST message to the NodeB, where the radio link setup request message includes the identifier information of the UE.
  • the NodeB re-establishes a new radio link for the UE, and sends a RADIO LINK SETUP RESPONSE message to the RNC.
  • the RNC sends a CELL UPDATE CONFIRM message to the UE.
  • the UE re-establishes the wireless link and sends a PHYSICAL CHANNEL RECONFIGURATION COMPLETE message to the RNC.
  • the RNC does not receive the downlink signaling or downlink data after the specified number of times.
  • the corresponding acknowledgment returned by the UE, or the RNC receives the radio link failure indication message sent by the NodeB, and the RNC instructs the NodeB to close the radio link transmitter corresponding to the UE, and further instructs the UE to re-search the cell to trigger the cell.
  • the update process can avoid the failure of the communication service performed by the user equipment caused by the RRC connection of the user equipment released by the controller in the prior art, so that the reliability of the communication service is improved, thereby ensuring the normal operation of the communication service.
  • FIG. 3 is a schematic flowchart diagram of a method for reestablishing a wireless link according to another embodiment of the present invention.
  • the radio link reconstruction method in this embodiment may include:
  • the RNC sends the search cell indication information to the UE by using the NodeB, to indicate that the UE searches for the cell again.
  • the RNC does not receive the corresponding acknowledgment returned by the UE after transmitting the specified number of downlink signaling or downlink data, or the RNC receives the radio link failure indication message sent by the NodeB corresponding to the UE.
  • the RNC sends the search cell indication information to the UE through the NodeB.
  • the RNC carries the search cell indication information in the payload of the FP frame, and the NodeB does not parse the search cell indication information in the payload, and transparently transmits the indication information to the UE, to indicate that the UE searches for the cell again;
  • the RNC carries the search cell indication information in the header of the FP frame, and the NodeB parses the search cell indication information in the header, and then forwards the indication information to the UE, to instruct the UE to re-search for the cell.
  • the UE searches for a cell according to the foregoing search cell indication information.
  • the UE sends a cell update (CELL UPDATE) message to the RNC through the NodeB in a cell that meets the cell selection preset condition, where the cell update message carries a cause value, which is used to indicate the radio link out of synchronization (RADIO LINK FAILURE).
  • CELL UPDATE cell update
  • the cell update message carries a cause value, which is used to indicate the radio link out of synchronization (RADIO LINK FAILURE).
  • the RNC identifies the cell in which the UE is located according to the cell update message, and sends a radio link deletion request (RADIO LINK DELETE REQUEST) message to the NodeB, where the radio link deletion request message includes U E identification information;
  • RADIO LINK DELETE REQUEST radio link deletion request
  • the RNC can identify the cell where the UE is located according to the cell that receives the cell update message.
  • the NodeB deletes the radio link established by the UE, and sends a radio link deletion response (RADIO LINK DELETE RESPONSE) message to the RNC.
  • RADIO LINK DELETE RESPONSE radio link deletion response
  • the RNC sends a RADIO LINK SETUP REQUEST message to the NodeB, where the radio link setup request message includes the identifier information of the UE.
  • the NodeB re-establishes a new radio link for the UE, and sends a RADIO LINK SETUP RESPONSE message to the RNC.
  • the RNC sends a CELL UPDATE CONFIRM message to the UE.
  • the UE re-establishes a wireless link, and sends a PHYSICAL CHANNEL RECONFIGURATION COMPLETE message to the RNC.
  • the RNC does not receive the downlink signaling or downlink data after the specified number of times.
  • Corresponding acknowledgment returned by the UE, or the RNC receives the radio link failure indication sent by the NodeB
  • the RNC sends the search cell indication information to the UE through the NodeB, and instructs the UE to re-search the cell to trigger the cell update process, which can avoid the user equipment in the prior art caused by the controller releasing the RRC connection of the user equipment.
  • the failure of the communication service makes the reliability of the communication service improved, thereby ensuring the normal operation of the communication service.
  • FIG. 4 is a schematic structural diagram of a controller according to another embodiment of the present invention.
  • the controller of this embodiment may include an indication unit 41, a receiving unit 42, and an establishing unit 43.
  • the indicating unit 41 is configured to: if the controller sends the downlink signaling or the downlink data of the specified number of times, the corresponding acknowledgment returned by the user equipment in the cell-dedicated channel state is not received, or the controller receives the foregoing a radio link failure indication message of the user equipment, instructing the user equipment to re-search for a cell;
  • the receiving unit 42 is configured to receive a cell update message sent by the user equipment in a cell that meets a cell selection preset condition;
  • the establishing unit 43 is configured to The user equipment re-establishes a wireless link.
  • the method for selecting a cell that meets the cell selection preset condition may include multiple methods, for example, selecting, in a cell with a signal strength greater than or equal to a preset intensity threshold, randomly selecting a cell; for example: the signal strength is greater than The cell with the highest signal strength is selected among all the cells that are equal to the preset strength threshold.
  • the functions of the RNC in the embodiment corresponding to FIG. 1 to FIG. 3 can be implemented by the controller provided in this embodiment.
  • the controller provided in this embodiment is an RNC as an example for detailed description. If the RNC does not receive the corresponding acknowledgment returned by the UE in the CELL_DCH state after transmitting the specified number of downlink signaling or downlink data, it indicates that the signal quality between the RNC and the UE is deteriorated, and the communication service cannot be performed, that is, the RNC is If the downlink SRB reset or the downlink TRB reset is detected, the RNC instructs the UE to re-search for the cell; or the NodeB detects that the uplink radio link between the UE in the CELL_DCH state and the NodeB is out of synchronization, and the RNC receives the NodeB.
  • the transmitted radio link failure indication (RADIO LINK FAILURE INDICATION) message, the indication unit 41 instructs the UE to re-search for the cell.
  • the indication unit 41 in the controller of the present embodiment may include at least one of the following subunits:
  • the first indication subunit 51 is configured to send, by the base station, the radio link transmitter indication information, to indicate that the base station disables the radio link transmitter corresponding to the user equipment, to trigger the user equipment to re-search for the cell;
  • the second indication sub-unit 52 is configured to send the search cell indication information to the user equipment by using the foregoing base station, to indicate that the user equipment searches for a cell again.
  • the first indication subunit 51 may specifically send a radio link activation command message to the base station, where the radio link activation command message carries the off radio link transmitter indication information.
  • the base station turns off the radio link transmitter corresponding to the user equipment according to the off radio link transmitter indication information, that is, the base station no longer sends any signal to the user equipment.
  • the user equipment may be triggered to re-search for the cell. For example, the user equipment detects that the downlink radio link is out of synchronization, or if the user equipment does not receive the corresponding acknowledgement returned by the controller after transmitting the specified number of uplink signaling or uplink data, the user equipment searches for the cell again.
  • the second indicator sub-unit 52 may send the FP frame to the base station, where the payload of the FP frame includes the search cell indication information, so that the base station transparently transmits the search cell indication information to the user equipment.
  • the NodeB does not parse the search cell indication information in the payload, and transmits the indication information to the UE to indicate the foregoing.
  • the UE re-searches for the cell.
  • the second indication sub-unit 52 may further send an FP frame to the base station, where the header of the FP frame includes the search cell indication information, so that the base station forwards the search cell indication information to the user equipment.
  • the NodeB parses the search cell indication information in the header, and then forwards the indication information to the UE, to indicate the foregoing.
  • the UE re-searches the cell.
  • the establishing unit 43 in this embodiment may specifically delete the wireless link previously established for the user equipment, and re-establish a new wireless link for the user equipment.
  • the controller passes the The indication unit instructs the user equipment to re-search the cell to trigger the cell update procedure, which can avoid the communication service failure of the user equipment caused by the RRC connection of the user equipment released by the controller in the prior art, so that the communication service is improved. Reliability, thus ensuring the normal operation of the communication service.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division, and may be implemented in actual implementation.
  • multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like, and the program code can be stored. Medium.

Description

无线链路重建方法及控制器
技术领域
本发明实施例涉及通信技术，尤其涉及一种无线链路重建方法及控制器。 背景技术
通用移动通信系统 ( Universal Mobile Telecommunication System, 简 称 UMTS )中， 随着处于小区专用信道（CELL_DCH )状态的用户设备（User Equipment, 简称 UE )的移动， 当前为 UE提供服务的小区的信号强度突然 下降时， 或者 UE 以非常快的移动速度进入相邻小区时， 无线网络控制器 ( Radio Network Controller, 简称 RNC )来不及将 UE及时切换到新小区 , 而当前小区已经无法为 UE提供服务。 此时， 如果 RNC多次发送下行信令或 下行数据之后没有接收到 UE返回的确认， 或者 RNC接收到基站（NodeB ) 发送的无线链路失败指示 ( Radio Link Failure Indication ) 消息， RNC则可 以释放 UE的无线资源控制 （ Radio Resource Control, 简称 RRC )连接， 导致了 UE所进行的通信业务失败例如： 掉话， 从而降低了通信业务的可靠 性。 其他通信系统也存在类似问题。 发明内容
本发明实施例提供一种无线链路重建方法及控制器， 用以提高通信业务 的可靠性， 保证通信业务的正常进行。
一方面， 提供了一种无线链路重建方法， 包括：
若控制器发送指定次数的下行信令或下行数据后均未收到处于小区专用 信道状态的用户设备返回的对应的确认， 或者所述控制器接收到对应于所述 用户设备的基站发送的无线链路失败指示消息， 所述控制器指示所述用户设 备重新搜索小区；
所述控制器接收所述用户设备在满足小区选择预设条件的一个小区中发 送的小区更新消息；
所述控制器为所述用户设备重新建立无线链路。
另一方面， 提供了一种控制器， 包括：
指示单元， 用于若所述控制器发送指定次数的下行信令或下行数据后均 未收到处于小区专用信道状态的用户设备返回的对应的确认， 或者所述控制 器接收到对应于所述用户设备的基站发送的无线链路失败指示消息， 指示所 述用户设备重新搜索小区；
接收单元， 用于接收所述用户设备在满足小区选择预设条件的一个小区 中发送的小区更新消息；
建立单元， 用于为所述用户设备重新建立无线链路。
由上述技术方案可知， 如果控制器发送指定次数的下行信令或下行数据 后均未收到处于 CELL_DCH 状态的用户设备返回的对应的确认， 或者控制 器接收到对应于上述用户设备的基站发送的无线链路失败指示消息， 本发明 实施例中的控制器则可以通过指示该用户设备重新搜索小区， 用以触发小区 更新流程，能够避免现有技术中由于控制器释放用户设备的 RRC连接而导致 的用户设备所进行的通信业务失败， 使得提高了通信业务的可靠性， 从而保 证了通信业务的正常进行。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见地， 下 面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在 不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明一实施例提供的无线链路重建方法的流程示意图； 图 2为本发明另一实施例提供的无线链路重建方法的流程示意图； 图 3为本发明另一实施例提供的无线链路重建方法的流程示意图； 图 4为本发明另一实施例提供的控制器的结构示意图；
图 5为本发明另一实施例提供的控制器的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
本发明的技术方案， 可以应用于各种通信系统， 例如： 全球移动通信系 统 ( Global System for Mobile Communications, 简称 GSM ), 通用分组 无线业务（General Packet Radio Service, 简称 GPRS ) 系统， 码分多址 ( Code Division Multiple Access, 简称 CDMA ) 系统， 宽带码分多址（Wi deband Code Division Multiple Access, 简称 WCDMA ) 系统， 时分同步 码分多址 ( Time Division-Synchronous Code Division Multiple Access, 简称 TD-SCDMA ) 系统等。 但为描述方便， 下述实施例以 WCDMA系统为 例进行说明。
基站， 例如， 可以是 GSM系统、 GPRS系统或 CDMA系统中的基站（B ase Transceiver Station, 简称 BTS ), 也可以是 WCDMA系统中的基站（ N odeB ), 本发明并不限定， 但为描述方便， 下述实施例以 NodeB为例进行说 明。
控制器， 例如， 可以是 GSM系统、 GPRS系统或 CDMA系统中的基站 控制器（Base Station Controller, 简称 BSC ), 也可以是 WCDMA系统中 的无线网络控制器（Radio Network Controller, 简称 RNC ), 本发明并不限 定， 但为描述方便， 下述实施例以 RNC为例进行说明。
图 1 为本发明一实施例提供的无线链路重建方法的流程示意图， 如图 1 所示， 本实施例的无线链路重建方法可以包括：
101、 若 RNC 发送指定次数的下行信令或下行数据后均未收到处于 CELL_DCH状态的 UE返回的对应的确认， 或者上述 RNC接收到对应于上 述 UE 的 NodeB 发送的无线链路失败指示 （ RADIO LINK FAILURE INDICATION ) 消息， 上述 RNC指示上述 UE重新搜索小区；
具体地，如果 RNC发送指定次数的下行信令或下行数据之后均未收到处 于 CELL_DCH状态的 UE返回的对应的确认， 则说明 RNC与 UE之间的信 号质量变差， 已经无法进行通信业务， 即 RNC就会检测到下行信令无线承载 ( Signaling Radio Bear, 简称 SRB ) 复位或者下行业务无线承载（Traffic Radio Bear, 简称 TRB ) 复位， 则所述 RNC指示所述 UE重新搜索小区； 或者 NodeB检测到处于 CELL_DCH状态的 UE与该 NodeB之间的上行无 线链路失步， RNC会收到 NodeB发送的无线链路失败指示（RADIO LINK FAILURE INDICATION ) 消息， 则所述 RNC指示所述 UE重新搜索小区。
具体地， RNC可以通过多种方式， 指示上述 UE重新搜索小区。
例如： RNC可以向 NodeB发送关闭无线链路发射机指示信息， 用以指 示 NodeB关闭上述 UE对应的无线链路发射机， 以触发上述 UE重新搜索小 区。 NodeB根据该指示信息， 关闭上述 UE对应的无线链路发射机， 即不再 发送任何信号给该 UE。 此时， 由于 NodeB不再发送任何信号给 UE, 则可 以触发 UE重新搜索小区。 例如： 该 UE检测到下行无线链路失步， 或者如 果 UE发送指定次数的上行信令或上行数据后均未收到 RNC返回的对应的确 认， 那么 UE则会重新搜索小区。 具体地， 可以通过新的消息携带上述关闭 无线链路发射机指示信息， 还可以通过修改现有的消息携带上述关闭无线链 路发射机指示信息， 例如： 可以由无线链路激活命令（RADIO LINK ACTIVE COMMAND ) 消息携带上述关闭无线链路发射机指示信息。 再例如： RNC可以通过 NodeB向上述 UE发送搜索小区指示信息， 用 以指示上述 UE重新搜索小区。 UE根据该指示信息， 则会重新搜索小区。 具 体地， 本发明实施例中， RNC 具体可以通过将搜索小区指示信息携带在向 NodeB发送的帧协议（Frame Protocol, 简称 FP )帧的不同位置， 来实现指 示上述 UE重新搜索小区。 例如： RNC将搜索小区指示信息携带在 FP帧的 净荷中， NodeB 不解析净荷中的搜索小区指示信息， 将该指示信息透传给 UE, 用以指示上述 UE重新搜索小区； 再例如： RNC将搜索小区指示信息携 带在 FP帧的头部中， NodeB解析出头部中的搜索小区指示信息， 然后将该 指示信息转发给 UE, 用以指示上述 UE重新搜索小区。
102、 上述 RNC接收上述 UE在满足小区选择预设条件的一个小区中发 送的小区更新（CELL UPDATE ) 消息；
其中， RNC接收到的上述小区更新消息中携带原因值， 用以指示无线链 路失步 ( RADIO LINK FAILURE )。
具体地， 上述满足小区选择预设条件的一个小区的选择方法可以包括多 种方法， 例如： 信号强度大于或等于预先设置的强度阈值的所有小区中， 随 机选择一个小区； 再例如： 信号强度大于或等于预先设置的强度阈值的所有 小区中， 选择信号强度最大的小区； 上述说明仅是例举性的， 本发明实施例 不进行限制。
103、 上述 RNC为上述 UE重新建立无线链路。
具体地， RNC可以删除之前为上述 UE建立的无线链路， 并为该 UE重 新建立新的无线链路。
本实施例中， 随着处于 CELL_DCH状态的 UE的移动， 当前为 UE提供 服务的小区的信号强度突然下降， 或者 UE以非常快的移动速度进入相邻小 区， 如果控制器发送指定次数的下行信令或下行数据后均未收到处于 CELL_DCH 状态的 UE返回的对应的确认， 或者控制器接收到对应于上述 UE的基站发送的无线链路失败指示消息，本发明实施例中的控制器则可以通 过指示该 UE重新搜索小区， 用以触发小区更新流程， 能够避免现有技术中 由于控制器释放用户设备的 RRC连接而导致的 UE所进行的通信业务失败， 使得提高了通信业务的可靠性， 从而保证了通信业务的正常进行。
图 2为本发明另一实施例提供的无线链路重建方法的流程示意图。 本实 施例中， 如图 2所示， 本实施例的无线链路重建方法可以包括：
201、 RNC向 NodeB发送无线链路激活命令 ( RADIO LINK ACTIVE COMMAND ) 消息， 该无线链路激活命令消息中包含无线链路发射机指示信 息， 用以指示 NodeB关闭上述 UE对应的无线链路发射机；
例如： UE处于 CELL_DCH状态之后， RNC发送指定次数的下行信令 或下行数据后均未收到 UE返回的对应的确认，或者 RNC接收到对应于上述 UE的 NodeB发送的无线链路失败指示消息， RNC则向 NodeB发送上述无 线链路激活命令。
202、 NodeB关闭上述 UE对应的无线链路发射机；
这样， NodeB不再发送任何信号给 UE, 以触发 UE重新搜索小区。 203、 由于 NodeB不再发送任何信号给 UE, UE检测到下行无线链路失 步， 或者如果 UE发送指定次数的上行信令或上行数据之后没有接收到 RNC 返回的确认， 则重新搜索小区；
204、 UE在满足小区选择预设条件的一个小区中通过 NodeB向 RNC发 送小区更新 （CELL UPDATE ) 消息， 该小区更新消息携带原因值， 用以指 示无线链路失步（ RADIO LINK FAILURE )。
205、 RNC根据上述小区更新消息，识别出 UE所在的小区，并向 NodeB 发送无线链路删除请求（RADIO LINK DELETE REQUEST ) 消息， 该无线 链路删除请求消息中包含 UE的标识信息；
206、 NodeB删除为上述 UE建立的无线链路， 并向 RNC发送无线链路 删除响应 （ RADIO LINK DELETE RESPONSE ) 消息；
通过 205和 206, 可以删除 NodeB为 UE建立的无线链路。 207、 RNC 向 NodeB发送无线链路建立请求（ RADIO LINK SETUP REQUEST ) 消息， 该无线链路建立请求消息中包含 UE的标识信息；
208、 NodeB为上述 UE重新建立新的无线链路， 并向 RNC发送无线链 路建立响应 （RADIO LINK SETUP RESPONSE ) 消息；
209、 RNC向 UE发送小区更新证实（CELL UPDATE CONFIRM )消息；
210、 UE 重新建立无线链路， 并向 RNC 发送物理信道重配置完成 ( PHYSICAL CHANNEL RECONFIGURATION COMPLETE ) 消息。
通过 207~210, 通过 RNC、 NodeB与 UE之间的交互， 为 UE重新建立 了新的无线链路。
本实施例中，如果 RNC发送指定次数的下行信令或下行数据后均未收到
UE返回的对应的确认， 或者 RNC接收到 NodeB发送的无线链路失败指示 消息， RNC则通过指示 NodeB关闭上述 UE对应的无线链路发射机， 进而 能够指示该 UE重新搜索小区， 用以触发小区更新流程， 能够避免现有技术 中由于控制器释放用户设备的 RRC连接而导致的用户设备所进行的通信业 务失败， 使得提高了通信业务的可靠性， 从而保证了通信业务的正常进行。
图 3为本发明另一实施例提供的无线链路重建方法的流程示意图。 本实 施例中， 如图 3所示， 本实施例的无线链路重建方法可以包括：
301、 RNC通过 NodeB向 UE发送搜索小区指示信息， 用以指示上述 UE重新搜索小区；
例如： UE处于 CELL_DCH状态之后， RNC发送指定次数的下行信令 或下行数据后均没有收到 UE返回的对应的确认，或者 RNC接收到对应于上 述 UE的 NodeB发送的无线链路失败指示消息， RNC则通过 NodeB向 UE 发送搜索小区指示信息。
例如： RNC将搜索小区指示信息携带在 FP帧的净荷中， NodeB不解析 净荷中的搜索小区指示信息， 将该指示信息透传给 UE, 用以指示上述 UE重 新搜索小区； 再例如： RNC将搜索小区指示信息携带在 FP帧的头部中， NodeB解析 出头部中的搜索小区指示信息， 然后将该指示信息转发给 UE,用以指示上述 UE重新搜索小区。
302、 UE根据上述搜索小区指示信息， 重新搜索小区；
303、 UE在满足小区选择预设条件的一个小区中通过 NodeB向 RNC发 送小区更新 （CELL UPDATE ) 消息， 该小区更新消息携带原因值， 用以指 示无线链路失步（ RADIO LINK FAILURE )。
304、 RNC根据上述小区更新消息，识别出 UE所在的小区，并向 NodeB 发送无线链路删除请求（RADIO LINK DELETE REQUEST ) 消息， 该无线 链路删除请求消息中包含 U E的标识信息；
例如： RNC可以根据接收到上述小区更新消息的小区， 识别出 UE所在 的小区。
305、 NodeB删除为上述 UE建立的无线链路， 并向 RNC发送无线链路 删除响应 （RADIO LINK DELETE RESPONSE ) 消息；
通过 304和 305, 删除 NodeB为 UE建立的无线链路。
306、 RNC 向 NodeB发送无线链路建立请求（ RADIO LINK SETUP REQUEST ) 消息， 该无线链路建立请求消息中包含 UE的标识信息；
307、 NodeB为上述 UE重新建立新的无线链路， 并向 RNC发送无线链 路建立响应 （RADIO LINK SETUP RESPONSE ) 消息；
308、 RNC向 UE发送小区更新证实（CELL UPDATE CONFIRM )消息；
309、 UE 重新建立无线链路， 并向 RNC 发送物理信道重配置完成 ( PHYSICAL CHANNEL RECONFIGURATION COMPLETE ) 消息。
通过 306~309, 通过 RNC、 NodeB与 UE之间的交互， 为 UE重新建立 了新的无线链路。
本实施例中，如果 RNC发送指定次数的下行信令或下行数据后均未收到
UE返回的对应的确认， 或者 RNC接收到 NodeB发送的无线链路失败指示 消息， RNC则通过 NodeB向 UE发送搜索小区指示信息， 指示该 UE重新 搜索小区， 用以触发小区更新流程， 能够避免现有技术中由于控制器释放用 户设备的 RRC连接而导致的用户设备所进行的通信业务失败，使得提高了通 信业务的可靠性， 从而保证了通信业务的正常进行。
需要说明的是： 对于前述的各方法实施例， 为了简单描述， 故将其都表 述为一系列的动作组合， 但是本领域技术人员应该知悉， 本发明并不受所描 述的动作顺序的限制， 因为依据本发明， 某些步骤可以采用其他顺序或者同 时进行。 其次， 本领域技术人员也应该知悉， 说明书中所描述的实施例均属 于优选实施例， 所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中， 对各个实施例的描述都各有侧重， 某个实施例中没有 详述的部分， 可以参见其他实施例的相关描述。
图 4为本发明另一实施例提供的控制器的结构示意图， 如图 4所示， 本 实施例的控制器可以包括指示单元 41、 接收单元 42和建立单元 43。 其中， 指示单元 41 用于若上述控制器发送指定次数的下行信令或下行数据后均未 收到处于小区专用信道状态的用户设备返回的对应的确认， 或者上述控制器 接收到基站发送的上述用户设备的无线链路失败指示消息， 指示上述用户设 备重新搜索小区；接收单元 42用于接收上述用户设备在满足小区选择预设条 件的一个小区中发送的小区更新消息；建立单元 43用于为上述用户设备重新 建立无线链路。
具体地， 上述满足小区选择预设条件的一个小区的选择方法可以包括多 种方法， 例如： 信号强度大于或等于预先设置的强度阈值的所有小区中， 随 机选择一个小区； 再例如： 信号强度大于或等于预先设置的强度阈值的所有 小区中， 选择信号强度最大的小区； 上述说明仅是例举性的， 本发明实施例 不进行限制。
图 1〜图 3对应的实施例中的 RNC的功能均可以由本实施例提供的控制 器实现。 以本实施例提供的控制器为 RNC为例进行详细说明。 如果 RNC发送指 定次数的下行信令或下行数据之后均未收到处于 CELL_DCH状态的 U E返回 的对应的确认， 则说明 RNC与 UE之间的信号质量变差， 已经无法进行通信 业务， 即 RNC就会检测到下行 SRB复位或者下行 TRB复位， 则所述 RNC 指示所述 UE重新搜索小区；或者 NodeB检测到处于 CELL_DCH状态的 UE 与该 NodeB之间的上行无线链路失步， RNC会收到 NodeB发送的无线链路 失败指示（RADIO LINK FAILURE INDICATION )消息， 指示单元 41则指示 所述 UE重新搜索小区。
进一步地，如图 5所示，本实施例的控制器中的指示单元 41至少可以包 括以下子单元中的一个：
第一指示子单元 51 , 用于向上述基站发送关闭无线链路发射机指示信 息， 用以指示上述基站关闭上述用户设备对应的无线链路发射机， 以触发上 述用户设备重新搜索小区；
第二指示子单元 52, 用于通过上述基站向上述用户设备发送搜索小区指 示信息， 用以指示上述用户设备重新搜索小区。
需要指出的是，图 5中仅示出了同时包括第一指示子单元 51和第二指示 子单元 52的情况，在可选的实施例中，也可以仅包括上述两个子单元中的一 个。
具体地，第一指示子单元 51具体可以向上述基站发送无线链路激活命令 消息， 上述无线链路激活命令消息携带上述关闭无线链路发射机指示信息。 例如： 基站根据该关闭无线链路发射机指示信息， 则关闭上述用户设备对应 的无线链路发射机， 即基站不再发送任何信号给该用户设备。 此时， 由于基 站不再发送任何信号给用户设备， 则可以触发用户设备重新搜索小区。 例如： 该用户设备检测到下行无线链路失步， 或者如果用户设备发送指定次数的上 行信令或上行数据后均未收到控制器返回的对应的确认， 那么用户设备则会 重新搜索小区。 可选地， 第二指示子单元 52具体可以向上述基站发送 FP帧， 上述 FP 帧的净荷中包括上述搜索小区指示信息 , 以使上述基站将上述搜索小区指示 信息透传给上述用户设备。 例如： 如果第二指示子单元 52向基站发送的 FP 帧的净荷中携带搜索小区指示信息， NodeB不解析净荷中的搜索小区指示信 息， 将该指示信息透传给 UE, 用以指示上述 UE重新搜索小区。
可选地， 第二指示子单元 52具体还可以向上述基站发送 FP 帧， 上述 FP帧的头部中包括上述搜索小区指示信息，以使上述基站将上述搜索小区指 示信息转发给上述用户设备。 例如： 如果第二指示子单元 52 向基站发送的 FP帧的头部中携带搜索小区指示信息， NodeB解析出头部中的搜索小区指 示信息， 然后将该指示信息转发给 UE, 用以指示上述 UE重新搜索小区 具体地，本实施例中的建立单元 43具体可以删除之前为上述用户设备建 立的无线链路， 并为该用户设备重新建立新的无线链路。
应用本发明实施例中的控制器进行无线链路重建的具体过程与前述方法 实施例类似， 此处不再赘述。
本实施例中， 如果控制器发送指定次数的下行信令或下行数据后均未收 到用户设备返回的对应的确认， 或者控制器接收到基站发送的无线链路失败 指示消息， 控制器则通过指示单元指示该用户设备重新搜索小区， 用以触发 小区更新流程，能够避免现有技术中由于控制器释放用户设备的 RRC连接而 导致的用户设备所进行的通信业务失败， 使得提高了通信业务的可靠性， 从 而保证了通信业务的正常进行。
所属领域的技术人员可以清楚地了解到， 为描述的方便和简洁， 上述描 述的系统， 装置和单元的具体工作过程， 可以参考前述方法实施例中的对应 过程， 在此不再赘述。
在本申请所提供的几个实施例中， 应该理解到， 所揭露的系统， 装置和 方法， 可以通过其它的方式实现。 例如， 以上所描述的装置实施例仅仅是示 意性的， 例如， 所述单元的划分， 仅仅为一种逻辑功能划分， 实际实现时可 以有另外的划分方式， 例如多个单元或组件可以结合或者可以集成到另一个 系统， 或一些特征可以忽略， 或不执行。 另一点， 所显示或讨论的相互之间 的耦合或直接耦合或通信连接可以是通过一些接口， 装置或单元的间接耦合 或通信连接， 可以是电性， 机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的， 作 为单元显示的部件可以是或者也可以不是物理单元， 即可以位于一个地方， 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的部分或 者全部单元来实现本实施例方案的目的。
另外 ,在本发明各个实施例中的各功能单元可以集成在一个处理单元中 , 也可以是各个单元单独物理存在， 也可以两个或两个以上单元集成在一个单 元中。 上述集成的单元既可以采用硬件的形式实现， 也可以采用软件功能单 元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售 或使用时， 可以存储在一个计算机可读取存储介质中。 基于这样的理解， 本 发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的 全部或部分可以以软件产品的形式体现出来， 该计算机软件产品存储在一个 存储介质中， 包括若干指令用以使得一台计算机设备 (可以是个人计算机， 服务器， 或者网络设备等）执行本发明各个实施例所述方法的全部或部分步 骤。 而前述的存储介质包括： U 盘、 移动硬盘、 只读存储器 （Read-Only Memory, 简称 ROM )、 随机存取存储器（ Random Access Memory, 简称 RAM ), 磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要求
1、 一种无线链路重建方法， 其特征在于， 包括：
若控制器发送指定次数的下行信令或下行数据后均未收到处于小区专用 信道状态的用户设备返回的对应的确认， 或者所述控制器接收到对应于所述 用户设备的基站发送无线链路失败指示消息， 所述控制器指示所述用户设备 重新搜索小区；
所述控制器接收所述用户设备在满足小区选择预设条件的一个小区中发 送的小区更新消息；
所述控制器为所述用户设备重新建立无线链路。
2、 根据权利要求 1所述的方法， 其特征在于， 所述控制器指示所述用户 设备重新搜索小区， 包括：
所述控制器向所述基站发送关闭无线链路发射机指示信息， 用以指示所 述基站关闭所述用户设备对应的无线链路发射机， 以触发所述用户设备重新 搜索小区； 或者
所述控制器通过所述基站向所述用户设备发送搜索小区指示信息， 用以 指示所述用户设备重新搜索小区。
3、 根据权利要求 2所述的方法， 其特征在于， 所述控制器向所述基站发 送关闭无线链路发射机指示信息， 包括：
所述控制器向所述基站发送无线链路激活命令消息， 所述无线链路激活 命令消息携带所述关闭无线链路发射机指示信息。
4、 根据权利要求 2所述的方法， 其特征在于， 所述控制器通过所述基站 向所述用户设备发送搜索小区指示信息， 包括：
所述控制器向所述 占发送帧协议 FP帧， 所述 FP帧的净荷中包括所述搜索 小区指示信息， 以使所述 占将所述搜索小区指示信息透传给所述用户设备； 或者 所述控制器向所述基站发送 FP帧，所述 FP帧的头部中包括所述搜索小 区指示信息， 以使所述基站将所述搜索小区指示信息转发给所述用户设备。
5、根据权利要求 1至 4任一权利要求所述的方法， 其特征在于， 所述控 制器为无线网络控制器 RNC; 所述基站为 NodeB。
6、 一种控制器， 其特征在于， 包括：
指示单元， 用于若所述控制器发送指定次数的下行信令或下行数据后均 未收到处于小区专用信道状态的用户设备返回的对应的确认， 或者所述控制 器接收到对应于所述用户设备的基站发送的无线链路失败指示消息， 指示所 述用户设备重新搜索小区；
接收单元， 用于接收所述用户设备在满足小区选择预设条件的一个小区 中发送的小区更新消息；
建立单元， 用于为所述用户设备重新建立无线链路。
7、 根据权利要求 6所述的控制器， 其特征在于， 所述指示单元至少包括 以下子单元中的一个：
第一指示子单元， 用于向所述基站发送关闭无线链路发射机指示信息， 用以指示所述基站关闭所述用户设备对应的无线链路发射机， 以触发所述用 户设备重新搜索小区；
第二指示子单元， 用于通过所述基站向所述用户设备发送搜索小区指示 信息， 用以指示所述用户设备重新搜索小区。
8、 根据权利要求 7所述的控制器， 其特征在于， 所述第一指示子单元具 体用于向所述基站发送无线链路激活命令消息， 所述无线链路激活命令消息 携带所述关闭无线链路发射机指示信息。
9、根据权利要求 7或 8所述的控制器， 其特征在于， 所述第二指示子单 元具体用于
向所述基站发送帧协议 FP帧，所述 FP帧的净荷中包括所述搜索小区指 示信息， 以使所述基站将所述搜索小区指示信息透传给所述用户设备； 或者 向所述基站发送 FP帧，所述 FP帧的头部中包括所述搜索小区指示信息， 以使所述基站将所述搜索小区指示信息转发给所述用户设备。
10、 根据权利要求 6至 9任一权利要求所述的控制器， 其特征在于， 所 述控制器为无线网络控制器 RNC。
PCT/CN2011/076555 2011-06-29 2011-06-29 无线链路重建方法及控制器 WO2012103719A1 (zh)

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