WO2011000192A1 - 一种无线中继系统中的切换方法及系统 - Google Patents

一种无线中继系统中的切换方法及系统 Download PDF

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Publication number
WO2011000192A1
WO2011000192A1 PCT/CN2009/075742 CN2009075742W WO2011000192A1 WO 2011000192 A1 WO2011000192 A1 WO 2011000192A1 CN 2009075742 W CN2009075742 W CN 2009075742W WO 2011000192 A1 WO2011000192 A1 WO 2011000192A1
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Prior art keywords
relay
denb
handover
target
source
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PCT/CN2009/075742
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English (en)
French (fr)
Inventor
沈晓芹
韩立锋
马睿
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中兴通讯股份有限公司
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Publication of WO2011000192A1 publication Critical patent/WO2011000192A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to Long Term Evolution (LTE) technology, and in particular, to a handover method and system in a wireless relay system.
  • LTE Long Term Evolution
  • the network architecture of the LTE cellular wireless communication system is shown in Figure 1.
  • the network architecture is a flat architecture based on Internet Protocol (IP), including: Evolved Universal Terrestrial Access Network (E-UTRAN, Evolved Universal Terrestrial) Radio Access Network), a system architecture evolution core network (SAE CN); wherein, the SAE CN includes a SAE CN node composed of a Mobility Management Entity (MME) and a Serving Gateway (S-GW);
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • the E-UTRAN includes an E-UTRAN base station (eNB); the MME is responsible for control plane-related work such as mobility management, non-access stratum signaling processing, and user equipment (UE, User Equipment) context management; the S-GW is responsible for the user plane.
  • eNB E-UTRAN base station
  • eNB E-UTRAN base station
  • the MME is responsible for control plane-related work such as mobility management, non-access stratum signaling processing, and user equipment (UE
  • the eNB is connected to the SAE CN node through the S1 interface, specifically connected to the MME through the S1-MME interface of the control plane, and connected to the S-GW through the S1-U interface of the user plane.
  • the S1 interface supports Multi-point connection between the eNB and the MME and the S-GW; the eNB performs signaling and data transmission with the UE through the Uu interface; and the eNB passes the X2 interface Connected to support mobility of the UE in the entire network to ensure the seamless handover of the user.
  • the network architecture of the LTE cellular wireless communication system is as shown in FIG. 2, and the network architecture includes: Relay, eNB; wherein the Relay has the function of relaying data between the other network nodes through the wireless link. It may also have an information control function; the wireless link between the eNB and the UE is a direct link, including an uplink (UL) direct link, a downlink (DL) direct link, and a wireless chain between the relay and the UE.
  • the path is an access link (access link), including UL Access link, DL access link;
  • the radio link between the eNB and the relay is a backhaul link, including the UL backhaul link.
  • the eNB (DeNB, Donor eNB), the UE directly served by the eNB is called a Macro UE, and the UE served by the Relay is called a Relay UE.
  • the protocol stack scheme commonly used in the relay and DeNB in the LTE cellular radio communication system is the Proxy S1/X2 scheme.
  • the protocol stack scheme is as shown in FIG. 3: adding an SI AP proxy to the DeNB, the SI AP proxy for the MME and Relay is transparent.
  • the UE seems to be directly connected to the DeNB, that is, the MME and the S-GW do not see the data relay between the UE and the DeNB through the Relay; from the Relay side, the added DeNB is equivalent.
  • the interaction between the MME and the S-GW, itself and the DeNB seems to be a direct dialogue with the MME.
  • the main object of the present invention is to provide a handover method and system in a wireless relay system, which can implement handover between UEs connected to the same DeNB.
  • a switching method in a wireless relay system comprising:
  • the source relay interacts with the target relay through the DeNB, and the UE is switched from the source relay to the 3 standard relay.
  • the method further includes the source relay determining the operation of the target relay:
  • the source relay configures the UE measurement parameters and sends the measurement parameters to the UE according to the roaming restriction related information included in the UE context stored in the UE;
  • the UE performs measurement according to the received UE measurement parameter, and generates a measurement report by the measurement result and reports it to the source relay;
  • the source relay is determined according to the radio resource management information of the UE and the reported measurement report. Switch and determine the target relay.
  • the source relay is connected to the target DeNB in the same DeNB.
  • the process of the interaction between the source relay and the target relay through the DeNB includes: the source relay initiates a handover to the target relay through the DeNB;
  • the target relay After the UE accesses the target relay, the target relay requests the DeNB to switch the downlink path.
  • the DeNB notifies the source relay to release the resource, and the downstream path is switched from the source relay to the target.
  • the process of initiating the handover includes:
  • the source relay sends a handover request message carrying the target cell ID to the DeNB;
  • the DeNB sends a handover request message to the target relay according to the target cell ID carried in the received handover request message.
  • the switching operation of the UE is:
  • the source After receiving the response from the target relay through the DeNB, the source relays the UE to the target relay.
  • the UE accesses the target relay according to the command.
  • the operation of receiving the response by the source relay includes:
  • the target relay receives the handover request message for the UE, prepares handover at the L1/L2 layer, and responds to the DeNB handover request response message.
  • the command operations performed by the source relay include:
  • the DeNB receives a handover request response message for the UE, and then sends a handover command to the source Relay; the source relay forwards the received handover command to the UE.
  • the process of the UE accessing the target relay includes:
  • the UE acquires the uplink resource allocation and the timing advance from the target relay, performs synchronization to the target relay, and accesses the target relay through the random access procedure.
  • a switching system in a wireless relay system comprising:
  • the source relay is configured to send, by the DeNB, the information related to the handover to the target relay, and receive and process the information related to the handover sent by the DeNB, and support the UE to switch to the target relay;
  • the target relay is configured to send information related to handover to the source relay through the DeNB, receive and process information related to handover sent by the DeNB, and support UE handover from the source relay;
  • the DeNB is configured to perform information forwarding between the source relay and the target relay, and support the UE to switch from the source relay to the target relay.
  • the source relay includes:
  • the signaling transceiver module is configured to perform the sending and receiving of the information.
  • the source relay further includes: a target relay determining module, configured to determine a target relay.
  • the target relay determining module includes:
  • a parameter setting module configured to configure a UE measurement parameter according to the information related to the roaming restriction included in the UE context stored in the UE, and send the UE measurement parameter to the UE;
  • a determining module configured to receive the measurement report reported by the UE, and determine to perform handover according to the received measurement report and the radio resource management information of the UE, and determine the target relay.
  • the signaling transceiver module includes:
  • the command module is configured to initiate a handover to the target relay by using the DeNB, and after receiving the response sent by the target relay through the DeNB, request the UE to access the target relay;
  • the resource release module is configured to release the resource after receiving the notification sent by the DeNB.
  • the target relay includes:
  • the response and command module is configured to respond to the source relay's handover request, and request the DeNB to switch the downlink path after determining that the UE accesses.
  • the DeNB includes:
  • the DeNB further includes:
  • the path switching module is configured to notify the source relay to release the resource after receiving the request for switching the downlink path, and switch the downlink path from the source relay to the target relay.
  • the target relay is connected to the same DeNB as the source relay.
  • the method and the system of the present invention can use the DeNB as the MME, so that the source relay and the destination relay connected to the same DeNB exchange information through the DeNB, so as to implement handover between the source relay and the destination relay, the handover process does not need to be performed.
  • the MME/S-GW participates in the switching process and reduces the handover delay.
  • FIG. 1 is a schematic diagram of a network architecture of an LTE cellular wireless communication system
  • Figure 2 is a schematic diagram of the network architecture of the LTE cellular radio communication system after the introduction of the relay;
  • Figure 3 is a protocol stack diagram of the Proxy S1/X2 scheme;
  • FIG. 4 is a flowchart of implementing a handover method in a wireless relay system according to an embodiment of the present invention
  • FIG. 5 is a flowchart of implementing handover between UEs connected to a same DeNB by using the present invention.
  • the implementation process of the handover method in the wireless relay system according to the embodiment of the present invention is as shown in FIG. 4, and includes the following steps:
  • Step 401 The source relay determines the target relay.
  • the determining the target relay is specifically:
  • Step a the source relay configures the UE measurement parameter according to the information about the roaming restriction included in the UE context (the UE context), and sends the UE measurement parameter to the UE.
  • the information about the roaming restriction is the connection establishment or the last time.
  • Step bl The UE performs measurement according to the received UE measurement parameter, and generates a measurement report and reports the measurement report to the source Relay.
  • the measurement result is generated by the measurement result, which is specifically as follows: The measurement result is determined according to system information, specifications, and the like. , generate a measurement report.
  • Step cl The source relay determines to perform handover according to the radio resource management (RRM) information of the UE and the measurement information of the UE, and determines the target relay; the determined target relay is connected to the source relay.
  • RRM radio resource management
  • Step 402 The source relay interacts with the determined target relay through the donor eNB DeNB, and the user terminal UE is switched from the source relay to the target relay.
  • the source relay interacts with the determined target base station through the DeNB, and the UE is switched from the source relay to the target relay.
  • Step a2 The source relay initiates a handover to the target relay through the DeNB, and after receiving the response sent by the target relay through the DeNB, the UE is instructed to access the target relay;
  • the initiating handover and command access are specifically as follows:
  • Step a21 The source relay sends a handover request message carrying the target cell ID to the DeNB.
  • Step a22 The DeNB sends a handover request message to the target relay according to the target cell ID carried in the received handover request message.
  • Step a23 The target relay receives the handover request message, prepares handover at the L1/L2 layer, and responds to the DeNB handover request response message.
  • Step a24 After receiving the handover request response message, the DeNB sends a handover command to the source relay; the source relay forwards the received handover command to the UE.
  • Step b2 The UE accesses the target relay, that is, a packet data service is established between the UE and the target relay, and a handover confirmation message is sent to the target relay; the target relay requests the DeNB to switch the downlink path;
  • the UE accessing the target relay is specifically:
  • Step b21 The source relay sends the service network state to the target relay through the DeNB (SN Status ) conversion command, and data packets in the source Relay buffer;
  • DeNB SN Status
  • Step b22 The UE acquires the uplink resource allocation and the timing advance amount from the target relay, performs synchronization to the target relay, and accesses the target relay through the random access procedure.
  • Step 2 The DeNB notifies the source relay to release the resource, and the downlink path is switched from the source relay to the target relay, that is, the DeNB completes the establishment of the packet data service between the MME and the target relay, and ends the handover process.
  • the switching system in the wireless relay system of the embodiment of the present invention includes: a source relay, a target relay, and a DeNB;
  • the source relay is configured to determine the target relay, send signaling to the determined target relay through the DeNB, and receive and process signaling sent by the DeNB;
  • the target relay is configured to send signaling to the source relay through the DeNB, and receive and process signaling sent by the DeNB.
  • the DeNB is configured to forward the signaling or data sent by the source relay to the target relay, and forward the signaling or data sent by the target relay to the source relay to switch the UE from the source relay to the target relay.
  • the source relay includes:
  • a signaling transceiver module configured to send, by the DeNB, signaling to the determined target relay, and receive and process signaling sent by the DeNB;
  • the source relay further includes: a target relay determining module, configured to determine a target relay.
  • the target relay determining module includes: a parameter setting module, a determining module, where
  • a parameter setting module configured to configure a UE measurement parameter according to the information related to the roaming restriction included in the UE context stored in the UE, and send the UE measurement parameter to the UE;
  • a determining module configured to receive a measurement report reported by the UE, and determine, according to the received measurement report and the radio resource management information of the UE, to perform handover, and determine a target relay;
  • the measurement report is generated by the UE according to the measured result of the received UE measurement parameter; the determined target Relay is connected to the source Relay in the same DeNB.
  • the signaling transceiver module includes: a command module and a resource release module; wherein
  • the command module is configured to initiate a handover to the target relay by using the DeNB, and after receiving the response sent by the target relay through the DeNB, request the UE to access the target relay;
  • the resource release module is configured to release the resource after receiving the notification sent by the DeNB.
  • the target relay includes:
  • the response and command module is configured to respond to the handover request of the source relay, and after determining that the UE accesses, request the DeNB to switch the downlink path.
  • the DeNB includes:
  • the transceiver module is configured to forward the signaling or data sent by the source relay to the target relay, and forward the signaling or data sent by the target relay to the source relay;
  • the DeNB further includes:
  • the path switching module is configured to notify the source relay to release the resource after receiving the request for switching the downlink path, and switch the downlink path from the source relay to the target relay.
  • FIG. 5 is a schematic diagram of a process for implementing handover between UEs connected to the same DeNB by using the present invention when the protocol stack of the Relay and DeNB used by the LTE cellular radio communication system is Proxy S1/X2.
  • the packet data service of the UE and the source relay, the packet data service of the source relay and the DeNB are converted into the packet data service of the UE and the target relay, and the packet data service of the target Relay and the DeNB; and the UE is in the same DeNB.
  • the switching between the relay and the target relay does not affect the packet data service between the DeNB and the MME, and the DeNB and the S-GW. Therefore, when the UE switches between the source relay and the target relay in the same DeNB, the DeNB and the MME do not need to be changed.
  • the path of the S-GW is as follows:
  • Step 1 The source relay configures the UE measurement parameters according to the information related to the roaming restriction included in the UE context stored in the UE, and sends the measurement parameters to the UE.
  • Step 2 The UE performs measurement according to the received UE measurement parameters, and generates a measurement report according to the system information, the specification, and the like, and reports the measurement report to the source relay.
  • Step 3 The source relay determines to perform handover according to the RRM information of the UE and the measurement report reported by the UE, and determines the target relay.
  • Step 4 The source relay sends a handover request message carrying the target cell ID to the DeNB.
  • the determined target relay is connected to the source DeNB in the same DeNB.
  • Step 5 The DeNB sends a handover request message to the target relay according to the target cell ID carried in the received handover request message, and prepares the target relay to perform handover.
  • the handover request message carries the UL/DL GTP-U of the source relay. address.
  • Step 6 The target relay receives the handover request message, prepares handover at the L1/L2 layer, and replies to the DeNB handover request response message.
  • the handover request response message carries the UL/DL GTP-U address of the target relay.
  • the transparent container, C-RNTI and some other parameters, such as access parameters, System Information Block (SIB), etc., may also contain information of the radio network layer RNL/transport network layer TNL.
  • SIB System Information Block
  • Step 7 After receiving the handover request response message, the DeNB sends a handover command to the source relay.
  • the handover command carries the UL/DL GTP-U address of the target relay carried by the received handover request response message, and the transparent container. , C-RNTI and some other parameters.
  • Step 8 The source relay forwards the received handover command to the UE.
  • Step 9 The handover command received by the UE accesses the target relay, and sends a handover confirmation message to the target relay, that is, a packet data service is established between the UE and the target relay; wherein the handover confirmation message carries the received handover command.
  • C-RNTL carried
  • Step 10 After receiving the handover confirmation message, the target relay sends a downlink path switching request to the DeNB.
  • Step 11 The DeNB notifies the source relay to release the resource, and the downlink path is switched from the source relay to the target relay, and sends a path switch response to the target relay, that is, the DeNB completes the establishment of the packet data service between the MME and the target relay, and ends the handover. Process.
  • the method and system of the present invention enable handover between UEs connected to the same DeNB.

Abstract

本发明公开了一种无线中继系统中的切换方法，该方法将DeNB用作MME，使得连接在同一个DeNB的源Relay和目的Relay通过该DeNB进行信息交互，实现UE在该源Relay和目的Relay之间的切换。本发明还公开了一种无线中继系统中的切换系统，该系统包括源Relay、目标Relay和DeNB。采用本发明所述的方法和系统，能实现UE在与同一个DeNB连接的各中继之间的切换；并且切换过程无需MME/S-GW参与，简化了切换流程，并减少了切换时延。

Description

一种无线中继系统中的切换方法及系统 技术领域
本发明涉及长期演进 ( LTE , Long Term Evolution )技术， 尤其涉及一 种无线中继系统中的切换方法及系统。 背景技术
LTE蜂窝无线通讯系统的网络架构如图 1所示， 该网络架构是基于互 联网协议（ IP , Internet Protocol )的扁平化架构， 包括： 演进的通用地面无 线接入网 ( E-UTRAN, Evolved Universal Terrestrial Radio Access Network ), 系统架构演进核心网 （SAE CN ); 其中， SAE CN 包括由移动管理单元 ( MME, Mobility Management Entity )、月良务网关（ S-GW, Serving Gateway ) 组成的 SAE CN节点； E-UTRAN包括 E-UTRAN基站（ eNB ); MME负责 移动性管理、 非接入层信令的处理、 用户设备（UE, User Equipment )上下 文的管理等控制面相关工作； S-GW负责用户面数据的传送、转发和路由切 换等； eNB通过 S1接口连接到 SAE CN节点，具体为通过控制平面 S1-MME 接口与 MME相连， 以及通过用户平面 S1-U接口与 S-GW相连， S1接口支 持 eNB与 MME和 S-GW之间的多点连接； eNB通过 Uu接口与 UE进行 信令和数据的传输； eNB之间通过 X2接口互相连接， 以支持 UE在整个网 络内的移动性， 保证用户的无缝切换。
引入中继（Relay )后， LTE蜂窝无线通讯系统的网络架构如图 2所示， 该网络架构包括： Relay、 eNB; 其中， Relay具有在其它网络节点之间通过 无线链路中继数据的功能， 还可以具有信息控制功能； eNB与 UE之间的 无线链路为直传链路 ( direct link ), 包含上行（ UL ) direct link, 下行（ DL ) direct link; Relay与 UE之间的无线链路为接入链路 ( access link ), 包含 UL access link, DL access link; eNB 与 Relay之间的无线链路为回程链路 ( backhaul link ), 包含 UL backhaul link. DL backhaul link; 这里, 通过 backhaul link与 Relay连接的 eNB称为参与中继的 eNB( DeNB , Donor eNB ), eNB直接服务的 UE称为宏 UE ( Macro UE ), Relay服务的 UE称为中继 UE ( Relay UE )。
一般常用于 LTE蜂窝无线通讯系统中的 Relay和 DeNB的协议栈方案 为 Proxy S1/X2方案，该协议栈方案如图 3所示：在 DeNB上增加一个 SI AP 代理， 该 SI AP代理对于 MME和 Relay都是透明的。 这样， 从 MME和 S-GW侧看， UE好像是直接连接 DeNB的， 即： MME和 S-GW看不到 UE 和 DeNB间通过 Relay的数据中继； 从 Relay侧看， 增加的 DeNB相当于 MME和 S-GW, 自身与 DeNB的交互好像是和 MME直接对话。 但目前还 没有适用于基于 Proxy S1/X2架构方案的切换流程。 发明内容
有鉴于此， 本发明的主要目的在于提供一种无线中继系统中的切换方 法及系统， 能够实现 UE在与同一个 DeNB连接的各中继之间的切换。
为达到上述目的， 本发明的技术方案是这样实现的：
一种无线中继系统中的切换方法， 包括：
源 Relay与目标 Relay通过 DeNB进行交互， 将 UE由源 Relay切换至 3标 Relay。
该方法进一步包括源 Relay确定目标 Relay的操作：
源 Relay根据存储于自身的 UE上下文中所包含的漫游限制相关信息， 配置 UE测量参数并发送给 UE;
UE根据接收到的 UE测量参数进行测量， 将测量结果生成测量报告并 上报给源 Relay;
源 Relay根据所述 UE的无线资源管理信息及其所上报的测量报告确定 进行切换并确定目标 Relay。
所述源 Relay与目标 Relay连接在同一个 DeNB。
源 Relay与目标 Relay通过 DeNB进行所述交互的过程包括： 源 Relay通过 DeNB向目标 Relay发起切换；
在 UE接入目标 Relay后， 目标 Relay请求 DeNB切换下行路径；
DeNB通知源 Relay释放资源， 并将下行路径由源 Relay切换至目标
Rday。
所述发起切换的过程包括：
源 Relay向 DeNB发送携带目标小区 ID的切换需求消息；
DeNB根据接收到的切换需求消息携带的目标小区 ID, 向目标 Relay 发送切换请求消息。
UE的所述切换操作为：
源 Relay在接收到目标 Relay通过 DeNB发来的应答后，命令 UE接入 目标 Relay, UE根据该命令接入目标 Relay。
源 Relay接收所述应答的操作包括：
目标 Relay接收针对所述 UE的切换请求消息， 在 L1/L2层准备切换， 并应答 DeNB切换请求响应消息。
源 Relay执行的所述命令操作包括：
DeNB接收针对所述 UE的切换请求响应消息， 之后向源 Relay发送切 换命令； 源 Relay将接收到的切换命令转发至 UE。
UE接入所述目标 Relay的过程包括：
Relay緩冲区中的数据包；
UE从目标 Relay 获取上行链路资源分配和定时提前量， 执行到目标 Relay的同步， 并通过随机接入流程接入到目标 Relay。 一种无线中继系统中的切换系统， 包括：
源 Relay, 用于通过 DeNB向目标 Relay发送涉及切换的信息， 接收并 处理由 DeNB发来的涉及切换的信息， 支持 UE向目标 Relay切换；
目标 Relay, 用于通过 DeNB向源 Relay发送涉及切换的信息， 接收并 处理由 DeNB发来的涉及切换的信息， 支持来自所述源 Relay的 UE切换；
DeNB, 用于进行源 Relay与目标 Relay之间涉及切换的信息转发， 支 持 UE从所述源 Relay向所述目标 Relay切换。
所述源 Relay包括：
信令收发模块， 用于进行所述信息收发。
所述源 Relay进一步包括： 目标 Relay确定模块， 用于确定目标 Relay。 所述目标 Relay确定模块包括：
参数设置模块，用于根据存储于自身的 UE上下文中所包含的漫游限制 相关的信息， 配置 UE测量参数并发送给 UE;
确定模块，用于接收 UE上报的测量报告，并根据接收到的测量报告和 UE的无线资源管理信息确定进行切换、 以及确定目标 Relay。
所述信令收发模块包括：
命令模块， 用于通过 DeNB向目标 Relay发起切换， 并在接收到目标 Relay通过 DeNB发来的应答后， 命令 UE接入目标 Relay;
资源释放模块， 用于接收到 DeNB发来的通知后释放资源。
所述目标 Relay包括：
应答及命令模块， 用于应答源 Relay的切换请求， 并在确定 UE接入后 请求 DeNB切换下行路径。
所述 DeNB包括：
收发模块，用于进行所述源 Relay与目标 Relay之间涉及切换的信息转 所述 DeNB进一步包括：
路径切换模块，用于接收到切换下行路径的请求后，通知源 Relay释放 资源， 并将下行路径由源 Relay切换至目标 Relay。
所述目标 Relay与源 Relay连接在同一个 DeNB。
可见， 本发明方法和系统可将 DeNB 用作 MME, 使得连接在同一个 DeNB的源 Relay和目的 Relay通过该 DeNB进行信息交互， 实现 UE在该 源 Relay和目的 Relay之间的切换， 切换过程无需 MME/S-GW参与， 筒化 了切换流程， 并减少了切换时延。 附图说明
图 1为 LTE蜂窝无线通讯系统的网络架构示意图；
图 2为引入 Relay后 LTE蜂窝无线通讯系统的网络架构示意图； 图 3为 Proxy S1/X2方案的协议栈图；
图 4为本发明实施例无线中继系统中的切换方法的实现流程图； 图 5为采用本发明实现 UE在连接在同一个 DeNB的各中继之间的切换 的流程图。 具体实施方式
本发明实施例无线中继系统中的切换方法的实现流程如图 4所示， 包 括以下步骤：
步骤 401： 源 Relay确定目标 Relay;
其中， 所述确定目标 Relay具体为：
步骤 al、 源 Relay根据存储于自身的 UE上下文（ UE context ) 中所包 含的漫游限制相关的信息， 配置 UE测量参数并发送给 UE; 其中， 所述漫 游限制相关的信息为连接建立或者最近一次更新跟踪区域（Tracking Area ) 时存储于 UE context中的漫游限制相关的信息。 步骤 bl、 UE根据接收到的 UE测量参数进行测量， 并将测量结果生成 测量报告并上报给源 Relay; 其中， 所述将测量结果生成测量报告具体为： 将测量结果根据系统信息、 规范等规则， 生成测量报告。
步骤 cl、 源 Relay根据 UE的无线资源管理（RRM, Radio Resources Management )信息和 UE 上 4艮的测量 4艮告确定进行切换、 以及确定目标 Relay; 所确定的目标 Relay与源 Relay连接在同一个 DeNB。
步骤 402: 源 Relay与确定的目标 Relay通过赠与者 eNB DeNB进行交 互， 将用户终端 UE由源 Relay切换至目标 Relay。
其中， 所述源 Relay与确定的目标基站通过 DeNB进行交互， 将 UE由 源 Relay切换至目标 Relay具体为：
步骤 a2、 源 Relay通过 DeNB向目标 Relay发起切换， 并在接收到目 标 Relay通过 DeNB发来的应答后， 命令 UE接入目标 Relay;
其中， 发起切换、 命令接入具体为：
步骤 a21、 源 Relay向 DeNB发送携带目标小区 ID的切换需求消息； 步骤 a22、 DeNB根据接收到的切换需求消息携带的目标小区 ID, 向目 标 Relay发送切换请求消息；
步骤 a23、 目标 Relay接收到所述切换请求消息，在 L1/L2层准备切换， 并应答 DeNB切换请求响应消息；
步骤 a24、 DeNB接收到的切换请求响应消息后， 向源 Relay发送切换 命令； 源 Relay将接收到的切换命令转发至 UE。
步骤 b2、 UE接入目标 Relay, 即在 UE与目标 Relay间建立了分组数 据业务， 发送切换确认消息至目标 Relay; 目标 Relay请求 DeNB切换下行 路径；
其中， 所述 UE接入目标 Relay具体为：
步骤 b21、 源 Relay通过 DeNB向目标 Relay发送服务网络状态 （ SN Status )转换命令、 以及源 Relay緩冲区中的数据包；
步骤 b22、 UE向目标 Relay获取上行链路资源分配和定时提前量， 执 行到目标 Relay的同步， 并通过随机接入流程接入到目标 Relay。
步骤 c2、 DeNB通知源 Relay释放资源， 并将下行路径由源 Relay切换 至目标 Relay, 即通过 DeNB完成了 MME与目标 Relay间分组数据业务的 建立， 结束本次切换流程。
本发明实施例无线中继系统中的切换系统， 包括： 源 Relay、 目标 Relay 和 DeNB; 其中，
源 Relay, 用于确定目标 Relay, 通过 DeNB向确定的目标 Relay发送 信令， 接收并处理由 DeNB发来的信令；
目标 Relay,用于通过 DeNB向源 Relay发送信令，接收并处理由 DeNB 发来的信令；
DeNB, 用于将源 Relay发来的信令或数据转发至目标 Relay, 将目标 Relay发来的信令或数据转发至源 Relay,以实现将 UE由源 Relay切换至目 标 Relay。
其中， 所述源 Relay包括：
信令收发模块，用于通过 DeNB向确定的目标 Relay发送信令，接收并 处理由 DeNB发来的信令；
进一步地，源 Relay还包括：目标 Relay确定模块，用于确定目标 Relay。 进一步地， 所述目标 Relay确定模块包括： 参数设置模块、 确定模块； 其中，
参数设置模块，用于根据存储于自身的 UE上下文中所包含的漫游限制 相关的信息， 配置 UE测量参数并发送给 UE;
确定模块，用于接收 UE上报的测量报告，并根据接收到的测量报告和 UE的无线资源管理信息确定进行切换、 以及确定目标 Relay; 其中， 所述 测量报告由 UE根据接收到的 UE测量参数测量得到的结果生成；所确定的 目标 Relay与源 Relay连接在同一个 DeNB。
所述信令收发模块包括： 命令模块、 资源释放模块； 其中，
命令模块， 用于通过 DeNB向目标 Relay发起切换， 并在接收到目标 Relay通过 DeNB发来的应答后， 命令 UE接入目标 Relay;
资源释放模块， 用于接收到 DeNB发来的通知后释放资源。
其中， 所述目标 Relay包括：
应答及命令模块， 用于应答源 Relay的切换请求， 并确定 UE接入后， 请求 DeNB切换下行路径。
所述 DeNB包括：
收发模块， 用于将源 Relay发来的信令或数据转发至目标 Relay, 将目 标 Relay发来的信令或数据转发至源 Relay;
进一步地， DeNB还包括：
路径切换模块，用于接收到切换下行路径的请求后，通知源 Relay释放 资源， 并将下行路径由源 Relay切换至目标 Relay。
图 5为 LTE蜂窝无线通讯系统采用的 Relay和 DeNB的协议栈为 Proxy S1/X2时，采用本发明实现 UE在连接在同一个 DeNB的各中继之间的切换 的流程示意图， 由图示可见， 通过切换， UE与源 Relay的分组数据业务、 源 Relay与 DeNB的分组数据业务， 转换为 UE与目标 Relay的分组数据业 务、 以及目标 Relay与 DeNB的分组数据业务； 而 UE在同一 DeNB下源 Relay与目标 Relay间的切换，并不影响 DeNB与 MME、以及 DeNB与 S-GW 的分组数据业务， 因此， UE在同一 DeNB下源 Relay与目标 Relay间的切 换时， 不需要改变 DeNB与 MME、 S-GW的路径， 具体实现如下：
步骤 1 : 源 Relay根据存储于自身的 UE context中所包含的漫游限制相 关的信息， 配置 UE测量参数并发送给 UE。 步骤 2: UE根据接收到的 UE测量参数进行测量， 并将测量结果根据 系统信息、 规范等规则， 生成测量报告并上报给源 Relay。
步骤 3: 源 Relay根据 UE的 RRM信息和 UE上报的测量报告确定进 行切换、 以及确定目标 Relay。
步骤 4: 源 Relay向 DeNB发送携带目标小区 ID的切换需求消息； 所 确定的目标 Relay与源 Relay连接在同一个 DeNB。
步骤 5: DeNB根据接收到的切换需求消息携带的目标小区 ID,向目标 Relay发送切换请求消息， 请目标 Relay做好切换准备； 其中， 所述切换请 求消息携带源 Relay的 UL/DL GTP-U地址。
步骤 6: 目标 Relay接收到所述切换请求消息， 在 L1/L2层准备切换， 并回复 DeNB切换请求响应消息； 其中， 所述切换请求响应消息中携带目 标 Relay的 UL/DL GTP-U地址、 透明容器、 C-RNTI和一些其它参数， 例 如接入参数、 系统信息块（System Information Block, SIB )等， 还可能包 含无线网络层 RNL/传输网络层 TNL的信息。
步骤 7: DeNB接收到的切换请求响应消息后， 向源 Relay发送切换命 令； 其中， 所述切换命令携带有接收到的切换请求响应消息携带的目标 Relay的 UL/DL GTP-U地址、 透明容器、 C-RNTI和一些其它参数。
步骤 8: 源 Relay将接收到的切换命令转发至 UE;
步骤 9: UE接收到的切换命令， 接入目标 Relay, 并发送切换确认消 息至目标 Relay, 即在 UE与目标 Relay间建立了分组数据业务； 其中所述 切换确认消息携带接收到的切换命令所携带的 C-RNTL
步骤 10: 接收到所述切换确认消息后， 目标 Relay向 DeNB发出下行 路径切换请求。
从 MME/S-GW 到 DeNB 的路径并未改变， 因此， 不需要通知 MME/S-GW下行路径改变。 步骤 11 : DeNB通知源 Relay释放资源， 并将下行路径由源 Relay切换 至目标 Relay,向目标 Relay发出路径切换响应，即通过 DeNB完成了 MME 与目标 Relay间分组数据业务的建立， 结束本次切换流程。
综上所述，本发明方法及系统能够实现 UE在与同一个 DeNB连接的各 中继之间的切换。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种无线中继系统中的切换方法， 其特征在于， 包括：
源 Relay与目标 Relay通过 DeNB进行交互， 将 UE由源 Relay切换至 3标 Relay。
2、 根据权利要求 1所述的切换方法， 其特征在于， 该方法进一步包括 源 Relay确定目标 Relay的操作：
源 Relay根据存储于自身的 UE上下文中所包含的漫游限制相关信息， 配置 UE测量参数并发送给 UE;
UE根据接收到的 UE测量参数进行测量， 将测量结果生成测量报告并 上报给源 Relay;
源 Relay根据所述 UE的无线资源管理信息及其所上报的测量报告确定 进行切换并确定目标 Relay;
所确定的目标 Relay与源 Relay连接在同一个 DeNB。
3、 根据权利要求 1或 2所述的切换方法， 其特征在于， 源 Relay与目 标 Relay通过 DeNB进行所述交互的过程包括：
源 Relay通过 DeNB向目标 Relay发起切换请求；
在 UE接入目标 Relay后， 目标 Relay请求 DeNB切换下行路径；
DeNB通知源 Relay释放资源， 并将下行路径由源 Relay切换至目标 Rday。
4、 根据权利要求 3所述的切换方法， 其特征在于， 所述发起切换的过 程包括：
源 Relay向 DeNB发送携带目标小区 ID的切换需求消息；
DeNB根据接收到的切换需求消息携带的目标小区 ID, 向目标 Relay 发送切换请求消息。
5、 根据权利要求 1或 2所述的切换方法， 其特征在于， UE的所述切 换操作为：
源 Relay在接收到目标 Relay通过 DeNB发来的应答后，命令 UE接入 目标 Relay, UE根据该命令接入目标 Relay。
6、 根据权利要求 5所述的切换方法， 其特征在于， 源 Relay接收所述 应答的操作包括：
目标 Relay接收针对所述 UE的切换请求消息， 在 L1/L2层准备切换， 并应答 DeNB切换请求响应消息。
7、 根据权利要求 5所述的切换方法， 其特征在于， 源 Relay执行的所 述命令操作包括：
DeNB接收针对所述 UE的切换请求响应消息， 之后向源 Relay发送切 换命令； 源 Relay将接收到的切换命令转发至 UE。
8、 根据权利要求 5所述的切换方法， 其特征在于， UE接入所述目标 Relay的过程包括：
Relay緩冲区中的数据包；
UE从目标 Relay 获取上行链路资源分配和定时提前量， 执行到目标 Relay的同步， 并通过随机接入流程接入到目标 Relay。
9、 一种无线中继系统中的切换系统， 其特征在于， 包括：
源 Relay, 用于通过 DeNB向目标 Relay发送涉及切换的信息， 接收并 处理由 DeNB发来的涉及切换的信息， 支持 UE向目标 Relay切换；
目标 Relay, 用于通过 DeNB向源 Relay发送涉及切换的信息， 接收并 处理由 DeNB发来的涉及切换的信息， 支持来自所述源 Relay的 UE切换；
DeNB, 用于进行源 Relay与目标 Relay之间涉及切换的信息转发， 支 持 UE从所述源 Relay向所述目标 Relay切换。
10、根据权利要求 9所述的切换系统，其特征在于，所述源 Relay包括： 信令收发模块， 用于进行所述信息收发。
11、 根据权利要求 10所述的切换系统， 其特征在于， 所述源 Relay进 一步包括： 目标 Relay确定模块， 用于确定目标 Relay。
12、 根据权利要求 11所述的切换系统， 其特征在于， 所述目标 Relay 确定模块包括：
参数设置模块，用于根据存储于自身的 UE上下文中所包含的漫游限制 相关的信息， 配置 UE测量参数并发送给 UE;
确定模块，用于接收 UE上报的测量报告，并根据接收到的测量报告和 UE的无线资源管理信息确定进行切换、 以及确定目标 Relay。
13、 根据权利要求 10至 12任一项所述的切换系统， 其特征在于， 所 述信令收发模块包括：
命令模块， 用于通过 DeNB向目标 Relay发起切换， 并在接收到目标 Relay通过 DeNB发来的应答后， 命令 UE接入目标 Relay;
资源释放模块， 用于接收到 DeNB发来的通知后释放资源。
14、 根据权利要求 9至 12任一项所述的切换系统， 其特征在于， 所述 目标 Relay包括：
应答及命令模块， 用于应答源 Relay的切换请求， 并在确定 UE接入后 请求 DeNB切换下行路径。
15、根据权利要求 14所述的切换系统，其特征在于，所述 DeNB包括： 收发模块，用于进行所述源 Relay与目标 Relay之间涉及切换的信息转 发。
16、 根据权利要求 15所述的切换系统， 其特征在于， 所述 DeNB进一 步包括： 路径切换模块， 用于接收到切换下行路径的请求后， 通知源 Relay 释放资源， 并将下行路径由源 Relay切换至目标 Relay。
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