WO2011000193A1 - 一种无线中继***中终端的移动性管理方法及*** - Google Patents

一种无线中继***中终端的移动性管理方法及*** Download PDF

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Publication number
WO2011000193A1
WO2011000193A1 PCT/CN2009/075754 CN2009075754W WO2011000193A1 WO 2011000193 A1 WO2011000193 A1 WO 2011000193A1 CN 2009075754 W CN2009075754 W CN 2009075754W WO 2011000193 A1 WO2011000193 A1 WO 2011000193A1
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Prior art keywords
relay station
target relay
user terminal
target
denb
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PCT/CN2009/075754
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English (en)
French (fr)
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WO2011000193A8 (zh
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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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Priority to JP2012518000A priority Critical patent/JP2012531847A/ja
Priority to EP09846721.0A priority patent/EP2439991A4/en
Priority to US13/258,388 priority patent/US20120113887A1/en
Publication of WO2011000193A1 publication Critical patent/WO2011000193A1/zh
Publication of WO2011000193A8 publication Critical patent/WO2011000193A8/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • Terminal mobility management method and system in wireless relay system are Terminal mobility management method and system in wireless relay system
  • the present invention relates to the field of wireless communications, and in particular, to a method and system for managing mobility of a terminal in a wireless relay system. Background technique
  • the cellular wireless communication system is mainly composed of a terminal, an access network, and a core network.
  • a network composed of a base station or a base station and a base station controller is called a Radio Access Network (RAN), and is responsible for access layer transactions, such as management of radio resources.
  • RAN Radio Access Network
  • Each base station can be connected to one or more core network nodes (Core Networks, CN).
  • the core network is responsible for non-access layer transactions, such as location updates, and is the anchor point for the user plane.
  • a terminal is a device that can communicate with a cellular wireless communication network, such as a mobile phone or a laptop.
  • the wireless coverage of a fixed base station network is limited due to various reasons, such as the blockage of wireless signals by various building structures, and the like, which inevitably has coverage holes in the coverage of the wireless network.
  • the communication quality of the UE is poor at the cell edge, and the error rate of the wireless transmission is too high.
  • a wireless network node called a relay
  • Relay is a station that has the function of relaying data and possibly controlling information through wireless links between other network nodes. It is also called Relay Node/Relay Station. Its working principle is shown in Figure 2.
  • UE User Equipment
  • UE Called Macro UE
  • Relay UE the UE served by Relay.
  • the interface between each network element is defined as follows
  • Direct link The wireless link between the base station and the UE, including the uplink and downlink (DL/UL downlink/uplink) direct transmission link.
  • Access link The link between the Relay and the UE, including the DL/UL access link.
  • Backhaul link The wireless link between the base station and the relay, including the DL/UL trunk link.
  • Type 1 Relay which is special and subordinate:
  • the UE cannot distinguish between the relay and the cell under the fixed base station. That is, from the perspective of the UE, there is no difference between the cells in the cell under the relay.
  • the cell can be called a relay cell.
  • the relay cell has its own physical cell identity (PCI), and broadcasts the same as the normal cell.
  • PCI physical cell identity
  • the relay cell can separately allocate the scheduling radio resource to the UE.
  • the radio resource scheduling of the base station participating in the relay (the Donor eNodeB, that is, the base station connected by the relay through the backhaul link) is independent of each other.
  • the interface between the Relay cell and the Relay UE and the protocol stack are the same as those between the normal base station cell and the UE.
  • the LTE system adopts an IP (Internet Protocol)-based flat architecture. As shown in Figure 3, it is supported by an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), CN nodes, and others.
  • the node is composed of a CN node including: a Mobility Management Entity (MME) and a Serving Gateway (S-GW).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • the MME is responsible for control plane related operations such as mobility management, non-access stratum signaling processing, and user mobility management context management
  • the S-GW is responsible for UE user plane data transmission, forwarding, and routing handover; They are connected to each other through the X2 interface, which is used to support the mobility of the UE in the entire network, and ensures seamless switching of users.
  • Each The eNB is connected to the system architecture evolution (SAE) core network through the SI interface, that is, it is connected to the MME through the control plane Sl-MME interface, and is connected to the S-GW through the user plane S1-U interface, and the S1 interface supports the eNB and the eNB. Multipoint connection between MME and S-GW.
  • SAE system architecture evolution
  • Each eNB performs signaling and data transmission with the UE through a Uu interface (originally defined as a radio interface between the UTRAN and the UE).
  • the network architecture of LTE is as shown in FIG. 4.
  • the interface between Relay and the participating base stations (Doror eNodeB, DeNB) relayed UE data was extensively discussed.
  • the protocol stacks for Relay and DeNB are currently divided into two broad categories: the first is that the S1 interface terminates at Relay (there are three schemes), and the second is that the S1 interface terminates at the DeNB (there is a scheme).
  • the solution was proposed by Qualcomm Europe, and the control plane architecture is shown in Figure 5.
  • the Relay is completely transparent to the DeNB, and the S1-AP protocol is added to the MME to directly connect to the MME, and a Relay PGW (Proxy GateWay)/SGW (Serving GateWay) network element is added between the DeNB and the MME.
  • the DeNB's protocol modification but to some extent increased the network delay.
  • Solution 2 Proxy S1/X2 (The relay node looks like the cell under the DeNB for the MME) This scheme is proposed by Ericsson, and its control plane architecture is shown in Figure 6. The main purpose is to use an S1 AP on the DeNB. Proxy, this proxy is transparent to both MME and Relay. From the perspective of the MME, the UE seems to be directly connected to the DeNB; from the perspective of the Relay, it seems to be in direct dialogue with the MME.
  • the present invention proposes a control plane and user plane flow for the UE to switch from one Relay to another relay belonging to the same DeNB. Summary of the invention
  • the main object of the present invention is to provide a method for managing mobility of a terminal in a wireless relay system, which is used to solve the technical problem of the UE switching between different relays belonging to the same DeNB.
  • a method for managing mobility of a terminal in a wireless relay system includes the following steps:
  • Step A Establish an X2 interface link between the relay stations that belong to the same DeNB.
  • Step B Implement, by the X2 interface, a cell handover between the relay stations that belong to the same DeNB.
  • step B is specifically:
  • Step B1 The source relay station sends a handover request to the target relay station, and the target relay station performs the admission control;
  • Step B2 If the target relay station permits the user terminal to access, the source relay station performs forwarding of the user context and cache data;
  • Step B3 After the user terminal successfully accesses the target relay station, the target relay station notifies the DeNB that the path has changed, and the DeNB performs path switching. Further, step B1 is specifically:
  • Step B11 the source relay station performs a handover decision according to the measurement report sent by the user terminal, and if the user terminal is allowed to switch, step B12 is performed;
  • Step B12 The source relay station sends a handover request message to the target relay station by using the X2 interface, where the handover request message carries the GTP-U address of the user plane GPRS tunneling protocol of the uplink and downlink of the source relay station;
  • Step B13 The target relay station performs the grant access control, and if the user terminal is allowed to access the target relay station, sends a handover request response message to the source relay station by using the X2 interface, where the handover request response message carries the user plane GPRS of the uplink and downlink of the target relay station.
  • Tunneling Protocol GTP-U address
  • Step B14 The source relay station sends a handover command to the user terminal UE.
  • step B2 is specifically:
  • Step B21 The source relay station sends a service network state transition command to the target relay station, and forwards the user context and the cache data to the target relay station.
  • Step B22 The user terminal performs synchronization to the target relay station, and the target relay station sends a network response with an uplink resource allocation and a timing advance to the user terminal.
  • step B3 is specifically:
  • Step B31 After the user terminal successfully accesses the target relay station, the target relay station sends a downlink path switching request to the DeNB.
  • Step B32 The DeNB processes the downlink path switching request, and sends a downlink path switching response to the target relay station.
  • Step B33 The target relay station notifies the source relay station to release the user terminal context, and the source relay station releases the resource.
  • Another object of the present invention is to provide a mobility management system for a terminal in a wireless relay system.
  • the technical solution of the present invention is implemented as follows: A mobility management system for a terminal in a wireless relay system, comprising a user terminal, a source relay station and a target relay station and a DeNB belonging to the same DeNB, wherein an X2 interface is established between the source relay station and the target relay station, The X2 interface implements cell handover between the source relay station and the target relay station by the user terminal.
  • the source base station includes:
  • a handover decision module configured to perform a handover decision according to the user terminal sending the measurement report, and notify the handover request module to execute if the user terminal is allowed to switch;
  • a handover requesting module configured to send, by using an X2 interface, a handover request message to the target relay station, where the handover request message carries an uplink and downlink user plane GPRS tunneling protocol GTP-U address of the source relay station;
  • a handover notification module configured to send a handover command to the user terminal after the target relay station permits the user terminal to access and receives the handover request response message sent by the target relay station;
  • the network state transition notification module is configured to send a service network state transition command to the target relay station, and forward the user context and the cache data to the target relay station.
  • the target relay station includes:
  • the admission execution module is configured to perform the grant access control according to the handover request message sent by the handover request module of the source relay station, and notify the handover request response module to execute if the user terminal is permitted to access; and the handover request response module is configured to use the X2 interface to
  • the source relay station sends a handover request response message, where the handover request response message carries the user plane GPRS tunneling protocol GTP-U address of the uplink and downlink of the target relay station;
  • a downlink resource allocation module configured to send, to the user terminal, a network response with an uplink resource allocation and a timing advance for the user terminal to perform synchronization and access to the target relay station; and a path switching request module, configured to be used by the user After the terminal successfully accesses the target relay station, the terminal sends a downlink path switching request to the DeNB;
  • a resource release notification module configured to notify the source after receiving the downlink path switching request
  • the relay station releases the user terminal context
  • the DeNB includes:
  • the link switching module is configured to process the downlink path switching request, and send a path switching response to the target relay station.
  • FIG. 1 is a structural diagram of a cellular wireless communication system in the prior art
  • Figure 2 is a block diagram of a relay network
  • FIG. 3 shows the LTE network architecture
  • Figure 4 shows the network architecture after adding Relay in LTE.
  • Figure 5 is a control plane protocol stack of the scheme 1;
  • Figure 6 is a control plane protocol stack of scheme 2;
  • Figure 7 is a control plane protocol stack of scheme 4.
  • FIG. 8 is a flowchart of a method for managing mobility of a terminal in a wireless relay system according to the present invention
  • FIG. 9 is a schematic structural diagram of a mobility management system for a terminal in a wireless relay system according to the present invention.
  • the X2 interface established between the source relay and the target relay is used to implement handover between different relay stations of the same DeNB.
  • Step 1 The user terminal context (UE context) in the source relay contains the connection established. Information related to roaming restrictions provided when the Tracking Area information is last updated.
  • Step 2 The source relay configures the UE measurement procedure according to the information related to the roaming restriction described above, and the measurement provided by the source relay helps control the connection mobility of the UE.
  • Step 3 The UE sends a measurement report according to the criteria set by the system information, specifications, and the like.
  • Step 4 The source relay performs UE handover decision based on the measurement report sent by the UE and the Radio Resource Management (RMRM) information.
  • RMRM Radio Resource Management
  • Step 5 The source relay sends a handover request to the target relay to request the target relay to prepare for the switchover.
  • the handover request carries the upstream and downstream (UL/DL) user plane GPRS (General Packet Radio Service) tunneling protocol (GPRS Tunneling Protocol for the User plane, GTP-U) address of the source relay.
  • GPRS General Packet Radio Service
  • Step 6 If the target relay accepts the source relay's handover request, the target relay performs the admission control.
  • the target relay configures the required resources according to the received QoS information of the SAE, and retains the Cell Radio Network Temporary Identifier (C-RNTI) parameter and the optional random access preamble parameter.
  • C-RNTI Cell Radio Network Temporary Identifier
  • Step 7 The target relay prepares for handover at the L1/L2 layer and sends a handover request response message to the source relay.
  • the handover request response message carries the UL/DL GTP-U address of the target relay.
  • the handover request acknowledgement message includes a transparent container, a new C-RNTI, and some other parameters, such as access parameters, System Information Block (SIB), etc., and may also include a Radio Network Layer (RNL)/Transport Network Layer (TNL). ) Information.
  • SIB System Information Block
  • RNL Radio Network Layer
  • TNL Transport Network Layer
  • Step 8 The source relay sends a handover command to the UE.
  • the switch command contains a transparent container from the target Relay.
  • the source relay completes the necessary integrity protection and calculation of the message.
  • the UE receives a handover command with basic parameters (new C-RNTI, possible start time, target Relay SIB, etc.) and the handover is performed by the source Relay command.
  • the UE Because the UE also belongs to the cell served by the same macro base station, there is no need to leave the original cell to synchronize to the new small Area.
  • Step 9 The source relay sends a Serving Network Status conversion command to the target relay.
  • the source relay After the source relay sends a handover command to the UE, the source relay performs forwarding of the user context and the cached data, and forwards the user context and the buffered and forwarded packet data to the target Rday.
  • Step 10 The UE initiates a synchronization request to the target relay, and prepares to access the target relay station through the random access procedure.
  • Step 11 The target relay sends a network response with uplink resource allocation and timing advance to the UE.
  • the role of the uplink UL resource allocation is to allocate radio resources to the UE for the UE to send uplink.
  • the timing advance is for the UE to synchronize with the target relay.
  • Step 12 When the UE successfully accesses the target relay, the UE sends a handover confirmation message to the target relay to the target relay, and the message carries the C-RNTI of the UE, indicating that the handover procedure of the UE is completed.
  • the target Relay verifies the C-RNTI in the handover confirmation.
  • the target Relay can send data directly to the UE.
  • Step 13 After the handover is performed, the target relay sends a downlink path switching request to the DeNB. There is no need to notify the mobility management entity MME/Evolution System Architecture Gateway SAE GW to perform the path change because the path from the MME/SAE GW to the DeNB has not changed, but the DeNB is notified of the downlink data path change.
  • Step 14 The DeNB processes the downlink path switching request and sends a path switch response to the target relay.
  • Step 15 The target relay notifies the source Relay to release the UE context, and the source relay releases the resources, and the handover is completed. Thereafter, the UE establishes a packet data service with the target relay, and the MME establishes a packet data service to the target relay through the DeNB.
  • FIG. 9 is a logical structural diagram of the system according to the present invention, including a user terminal, a source relay station, and a destination Standard relay station, DeNB.
  • the invention establishes an X2 interface between the source relay station and the target relay station, and the system implements cell handover between the user terminals and the relay stations belonging to the same DeNB through the X2 interface between the source relay station and the target relay station.
  • the transmitting, by the user terminal, the measurement to the source relay station includes: the handover decision module of the source relay station performs the handover decision according to the measurement report sent by the user terminal, and the handover request module of the source relay station sends the handover request message to the target relay station by using the X2 interface, if the user terminal is allowed to switch.
  • the admission execution module of the target relay station performs the grant access control according to the handover request message, and if the user terminal is permitted to access, the handover request response module sends a handover request response message to the source relay station through the X2 interface, and receives the handover request response at the source relay station.
  • the handover notification module of the source relay station sends a handover command to the user terminal, and after the source relay station sends the handover command to the UE, the network state transition notification module of the source relay station sends a service network state transition command to the target relay station, and the buffer is in the buffer.
  • the packet is forwarded to the target relay.
  • the user terminal After receiving the handover command, the user terminal initiates synchronization with the target relay station and a random access procedure, and the downlink resource allocation module of the target relay station sends a network response with uplink resource allocation and timing advance to the user terminal for The user terminal performs synchronization and access to the target relay station.
  • the path switch requesting module sends a downlink path switch request to the DeNB; the DeNB processes the downlink path switch request and sends a path switch response to the target relay station.
  • the target relay station notifies the source relay station to release the user terminal context by the resource release notification module after receiving the path switch response.

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Description

一种无线中继***中终端的移动性管理方法及*** 技术领域
本发明涉无线通信领域， 尤其涉及一种无线中继***中终端的移动性 管理方法及***。 背景技术
如图 1 所示， 蜂窝无线通讯***主要由终端、 接入网和核心网组成。 基站或基站和基站控制器组成的网络称为无线接入网 （Radio Access Network, RAN ), 负责接入层事务， 比如无线资源的管理。 基站之间可以 根据实际情况存在物理或者逻辑上的连接， 如图 1 中的基站 1和基站 2或 者基站 3。每个基站可以和一个或者一个以上的核心网节点（ Core Network, CN )连接。 核心网负责非接入层事务， 比如位置更新等， 并且是用户面的 锚点。 终端是指可以和蜂窝无线通讯网络通讯的各种设备， 比如移动电话 或者笔记本电脑等。
在蜂窝无线通讯***中， 固定基站网络的无线覆盖由于各种各样的原 因受到限制， 比如各种建筑结构对无线信号的阻挡等原因造成在无线网络 的覆盖中无可避免的存在覆盖漏洞。 另外一方面在小区的边缘地区， 由于 无线信号强度的减弱， 以及相邻小区的干扰， 导致 UE在小区边缘时， 通讯 质量较差， 无线传输的错误率太高。 为了提高数据传输吞吐量， 群组移动 性， 临时网络部署， 小区边缘地区的吞吐量以及新区域的覆盖， 有一种解 决方案是在蜂窝无线通讯***引入一种无线网络节点， 称为中继 （Relay )。
Relay是具有在其他网络节点之间通过无线链路中继数据以及可能控 制信息功能的站点，也叫中继节点 /中继站 (Relay Node/Relay Station) ,其工 作原理如图 2所示。 其中基站直接服务的 UE ( User Equipment, 用户设备 ) 叫宏 UE ( Macro UE ) , Relay服务的 UE叫中继 UE(Relay UE)。
各网元间的接口定义如下
直传链路 (direct link) ：基站与 UE之间的无线链路，包含上下行（ DL/UL downlink/uplink )直传链路。
接入链路 (access link) ： Relay与 UE之间的链路， 包含 DL/UL接入链 路。
回程链路 (backhaul link) ： 基站与 Relay之间的无线链路， 包含 DL/UL 中继链路。
在众多的中继类型中， 有一种中继称为一类中继（Type l Relay ), 其特 、 口下：
UE无法区分 Relay和固定基站下的小区， 即从 UE看来， Relay下的小 区 3艮基站下的小区没有区别， 此类小区可以称为 Relay小区。 Relay小区和 所有的小区一样有自己的小区物理标识（ Physical Cell Identity, PCI ) , 和普 通小区一样发送广播， 当 UE驻留在中继小区中， 中继小区可以单独分配调 度无线资源给 UE使用， 与参与中继的基站（ Donor eNodeB , 即 Relay通过 backhaul link连接的基站）的无线资源调度相互独立。 Relay小区和 Relay UE 之间的接口以及协议栈与普通基站小区和 UE之间相同。
LTE***采用基于 IP ( Internet Protocol, 互联网协议 ) 的扁平化架构， 如图 3所示， 由演进的通用地面无线接入网 （Evolved Universal Terrestrial Radio Access Network, E-UTRAN )、 CN 节点及其他支撑节点组成， 其中 CN 节点包括： 移动管理单元（Mobility Management Entity, MME )、 服务 网关（Serving Gateway, S-GW )。 MME负责移动性管理、 非接入层信令的 处理、 用户的移动管理上下文的管理等控制面相关工作； S-GW负责 UE用 户面数据的传送、转发和路由切换等； eNB之间在逻辑上通过 X2接口互相 连接， 用于支持 UE在整个网络内的移动性， 保证用户的无缝切换。 每个 eNB通过 SI接口， 连接到***架构演进 ( System Architecture Evolution, SAE )核心网， 即通过控制平面 Sl-MME接口与 MME相连， 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。每个 eNB通过 Uu接口（最初定义为 UTRAN与 UE之间的无线接 口） 与 UE进行信令和数据的传输。
引入中继小区后， LTE的网络构架如图 4所示。 在 3GPP RAN#2 66次 会议上对于 Relay和参与中继的基站（ Donor eNodeB , DeNB )之间接口如 何中继 UE的数据进行了广泛讨论。对于 Relay和 DeNB的协议栈目前分为 两种大类： 第一类为 S1接口终止于 Relay (有三种方案）， 第二类为 S1接 口终止于 DeNB (有一种方案）。
方案 1: Full-L3中继， 对 DeNB完全透明
该方案由 Qualcomm Europe公司提出， 控制面架构如图 5所示。 其中 Relay对 DeNB完全透明， 在 Relay增加 S1-AP协议直接跟 MME连接， 并 在 DeNB和 MME之间添加 Relay PGW ( Proxy GateWay, 代理网关 ) /SGW ( Serving GateWay, 服务网关） 网元， 减少对 DeNB的协议修改， 但在一 定程度上增加了网络时延。
方案 2： Proxy S1/X2 (对 MME来说中继节点看上去像 DeNB下的小区） 该方案由 Ericsson公司提出， 其控制面架构如图 6所示， 其主旨是在 DeNB上用一个 S1 AP代理， 这个代理对于 MME和 Relay都是透明的。 从 MME看， UE好像是直接连接 DeNB的； 从 Relay看， 它像是和 MME直 接对话。
方案 3: 中继节点 （Relay Node, RN ) |载终止于 RN
该方案由 Samsung 公司提出。 该方案实际是方案 1 的特例， 即将 Alternative 1 中 DeNB和 Relay PGW/SGW的功能集中在 DeNB上面， 对 DeNB的协议做了一些修改。 方案 4: SI终止于 DeNB
该方案由华为公司提出，控制面架构如图 7所示。该方案在 Relay侧无 S1-AP的协议， 即由 RRC ( Radio Resources Control, 无线资源控制） 完成 S1-AP的协议功能。
目前大部门公司都支持 S1终止于 Relay,所以第四种方案优先级较低。 同时， Samsung公司自己也提出将自己的方案作为方案 1 的特例， 所以目 前就是方案 1 和方案 2的博弈。
本发明基于方案 2的***架构，提出了 UE从一个 Relay切换到同属于 一个 DeNB的另一个 Relay的控制面和用户面流程。 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***中终端的移 动性管理方法，用于解决 UE在同属同一个 DeNB的不同中继之间进行切换 的技术问题。
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***中终端的移动性管理方法， 包括步骤：
步骤 A、 建立同属于同一个 DeNB的中继站之间的 X2接口链路； 步骤 B、通过所述 X2接口实现在同属于同一个 DeNB的中继站之间的 小区切换。
进一步地， 步骤 B具体为：
步骤 B 1、 源中继站向目标中继站发送切换请求， 目标中继站执行准许 接入控制；
步骤 B2、 若目标中继站准许用户终端接入， 则源中继站执行用户上下 文及緩存数据的转发；
步骤 B3、在用户终端成功接入目标中继站后，由目标中继站通知 DeNB 路径已改变， DeNB执行路径切换。 进一步地， 步骤 B1具体为：
步骤 Bll、源中继站根据用户终端发送的测量报告执行切换判决，若允 许用户终端切换， 则执行步骤 B 12；
步骤 B 12、 源中继站通过 X2接口向目标中继站发送切换请求消息， 所 述切换请求消息中携带源中继站的上下行链路的用户面 GPRS 隧道协议 GTP-U地址；
步骤 B13、 目标中继站执行准许接入控制， 若准许用户终端接入目标 中继站通过 X2接口向源中继站发送切换请求响应消息，所述切换请求响应 消息中携带目标中继站的上下行链路的用户面 GPRS 隧道协议 GTP-U地 址；
步骤 B14、 源中继站向用户终端 UE发送切换命令。
进一步地， 步骤 B2具体为：
步骤 B21、 源中继站向目标中继站发送服务网络状态转换命令， 并将 用户上下文及緩存数据转发给目标中继站；
步骤 B22、 用户终端执行到目标中继站的同步， 所述目标中继站向用 户终端发送带有上行链路资源分配和定时提前量的网络响应。
进一步地， 步骤 B3具体为：
步骤 B31、 在用户终端成功接入目标中继站后， 目标中继站向 DeNB 发出下行路径切换请求，
步骤 B32、 DeNB处理下行路径切换请求， 并向目标中继站发出下行路 径切换响应；
步骤 B33、 目标中继站通知源中继站释放用户终端上下文， 源中继站 释放资源。
本发明的另一目的在于提供一种无线中继***中终端的移动性管理系 统， 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***中终端的移动性管理***， 包括用户终端、 同属于 同一个 DeNB的源中继站和目标中继站及 DeNB ,其特征在于，所述源中继 站和目标中继站之间建立 X2接口， 通过所述 X2接口实现用户终端在所述 源中继站和目标中继站之间的小区切换。
进一步地， 所述源基站包括：
切换判决模块， 用于根据用户终端发送测量报告执行切换判决， 在允 许用户终端切换的情况下通知切换请求模块执行；
切换请求模块， 用于通过 X2接口向目标中继站发送切换请求消息， 所 述切换请求消息中携带源中继站的上下行链路的用户面 GPRS 隧道协议 GTP-U地址；
切换通知模块， 用于在目标中继站准许用户终端接入且接收到目标中 继站发送的切换请求响应消息后向用户终端发送切换命令；
网络状态转换通知模块， 用于向目标中继站发送服务网络状态转换命 令， 并将用户上下文及緩存数据转发给目标中继站。
进一步地， 所述目标中继站包括：
准入执行模块， 用于根据源中继站的切换请求模块发送的切换请求消 息执行准许接入控制， 若准许用户终端接入则通知切换请求响应模块执行； 切换请求响应模块，用于通过 X2接口向源中继站发送切换请求响应消 息，所述切换请求响应消息中携带目标中继站的上下行链路的用户面 GPRS 隧道协议 GTP-U地址；
下行链路资源分配模块， 用于向用户终端发送带有上行链路资源分配 和定时提前量的网络响应以供用户终端执行到目标中继站的同步和接入； 路径切换请求模块， 用于在用户终端成功接入目标中继站后， 向 DeNB 发送下行路径切换请求；
资源释放通知模块， 用于在接收到所述下行路径切换请求后通知源中 继站释放用户终端上下文。
进一步地， 所述 DeNB包括：
链路切换模块， 用于处理所述下行路径切换请求， 并向目标中继站发 送路径切换响应。
在本发明所提出的切换流程下， 源中继站和目标中继站之间只需进行 一些数据转发的控制，无需通过 DeNB进行转发，也无需 MME/S-GW处理， 筒化了切换流程， 一定程度下减少了切换时延。 附图说明
图 1为现有技术中蜂窝无线通讯***的结构图；
图 2为中继网络结构图；
图 3 为 LTE网络架构；
图 4 为 LTE中加入 Relay后的网络架构；
图 5为方案 1的控制面协议栈；
图 6为方案 2的控制面协议栈；
图 7为方案 4的控制面协议栈；
图 8为本发明无线中继***中终端的移动性管理方法流程图； 图 9为本发明无线中继***中终端的移动性管理***的结构示意图。 具体实施方式 为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。
本发明在方案 2的***架构下，通过源 Relay与目标 Relay之间建立的 X2接口实现 UE在同属同一个 DeNB的不同中继站之间的切换。
如图 8所示， 切换控制面流程中的步骤如下：
步骤 1: 源 Relay内的用户终端上下文（ UE context ) 包含了在连接建 立或者跟踪区域（Tracking Area )信息最后更新时提供的漫游限制相关的信 息。
步骤 2: 源 Relay根据上述漫游限制相关的信息配置 UE测量程序， 由 源 Relay提供的测量有助于控制 UE的连接移动性。
步骤 3: UE根据***信息、 规范等设置的准则来发送测量报告。
步骤 4: 源 Relay基于 UE发送的测量报告和无线资源管理（Radio Resources Managemengt , RRM )信息进行 UE切换判决。
步骤 5: 源 Relay向目标 Relay发送切换请求， 请求目标 Relay做好切 换准备。 切换请求携带源 Relay的上下行（ UL/DL )用户面 GPRS ( General Package Radio Service, 通用分组无线业务） 隧道协议（GPRS Tunnelling Protocol for the User plane ， GTP-U )地址。
步骤 6: 如果目标 Relay接受源 Relay的切换请求， 则目标 Relay执行 准许接入控制。 目标 Relay按照接收的 SAE承载的 QoS信息配置需求的资 源，并保留小区无线网络临时标识（ Cell Radio Network Temporary Identifier, C-RNTI )参数以及可选的随机接入前导参数。
步骤 7: 目标 Relay在 L1/L2层准备切换， 并向源 Relay发送切换请求 响应消息。 切换请求响应消息中携带目标 Relay的 UL/DL GTP-U地址。
切换请求确认消息中包含透明容器、新 C-RNTI和一些其他参数，例如 接入参数、 ***信息块（System Information Block, SIB )等， 也可能包含 无线网络层（RNL ) /传输网络层（TNL ) 的信息。
步骤 8: 源 Relay向 UE发送切换命令。 切换命令包含来自目标 Relay 的透明容器。 源 Relay完成必须的完整性保护及消息的计算。 UE接收带有 基本参数 (新 C-RNTI、 可能的开始时间、 目标 Relay SIB等）的切换命令， 并且由源 Relay命令执行切换。
因为 UE还属于同一个宏基站服务的小区，无需离开原小区同步到新小 区。
步骤 9: 源 Relay向目标 Relay发送服务网络状态 （Serving Network Status )转换命令。
在源 Relay向 UE发送切换命令之后， 源 Relay执行用户上下文及緩存 数据的转发， 将用户上下文及緩存的和转发中的分组数据转发给目标 Rday。
步骤 10: UE发起到目标 Relay的同步请求， 准备通过随机接入流程接 入到目标中继站。
步骤 11:目标 Relay向 UE发送带有上行链路资源分配和定时提前量的 网络响应。
上行链路 UL资源分配的作用是给 UE分配无线资源让 UE可以上行发 送， 定时提前量是为了让 UE与目标 Relay进行同步。
步骤 12: 当 UE成功的接入目标 Relay, UE向目标 Relay发送切换确 认消息到目标 Relay,消息中携带 UE的 C-RNTI,指示 UE的切换程序完成。 目标 Relay检验切换确认里的 C-RNTI。 目标 Relay可向 UE直接发送数据。
步骤 13: 切换执行以后， 目标 Relay向 DeNB发出下行路径切换请求。 此时不需要通知移动性管理实体 MME/演进***架构网关 SAE GW下 行路径改变， 因为从 MME/SAE GW到 DeNB的路径未改变， 但是要通知 DeNB下行链路数据路径改变。
步骤 14: DeNB处理下行路径切换请求，并向目标 Relay发出路径切换 响应。
步骤 15: 目标 Relay通知源 Relay释放 UE上下文，源 Relay释放资源， 切换完成， 此后， UE与目标 Relay建立分组数据业务， MME通过 DeNB 向目标 Relay建立分组数据业务。
图 9 为本发明所述***的逻辑结构图， 包括用户终端、 源中继站、 目 标中继站、 DeNB。 本发明在源中继站和目标中继站之间建立 X2接口， 系 统通过源中继站和目标中继站之间的 X2接口实现用户终端在同属于同一 个 DeNB的中继站之间的小区切换。
用户终端向源中继站发送测量包括， 源中继站的切换判决模块根据用 户终端发送测量报告执行切换判决， 在允许用户终端切换的情况下由源中 继站的切换请求模块通过 X2接口向目标中继站发送切换请求消息， 目标中 继站的准入执行模块根据切换请求消息执行准许接入控制， 若准许用户终 端接入则由切换请求响应模块通过 X2接口向源中继站发送切换请求响应 消息， 在源中继站接收到切换请求响应后， 源中继站的切换通知模块向用 户终端发送切换命令， 源中继站在向 UE发送切换命令后， 由源中继站的网 络状态转换通知模块向目标中继站发送服务网络状态转换命令， 并将緩沖 区中的数据包转发给目标中继站。 用户终端在接收到切换命令后发起与目 标中继站的同步及随机接入过程， 由目标中继站的下行链路资源分配模块 向用户终端发送带有上行链路资源分配和定时提前量的网络响应以供用户 终端执行到目标中继站的同步和接入。 在 UE同步及接入到目标中继站后， 由路径切换请求模块向 DeNB发送下行路径切换请求； DeNB处理所述下行 路径切换请求， 并向目标中继站发送路径切换响应。 目标中继站在接收到 路径切换响应后由资源释放通知模块通知源中继站释放用户终端上下文。
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***中终端的移动性管理方法， 其特征在于， 包括：
A、 建立属于同一个参与中继的基站（DeNB ) 的中继站之间的 X2接 口链路；
B、 通过所述 X2接口实现用户终端（ UE )在属于同一个 DeNB的源中 继站和目标中继站之间的小区切换。
2、 根据权利要求 1所述的方法， 其特征在于， 步骤 B具体为：
B 1、 源中继站向目标中继站发送切换请求， 目标中继站执行准许接入 控制；
B2、 目标中继站准许用户终端接入时， 源中继站执行用户上下文及緩 存数据的转发；
B3、 在用户终端成功接入目标中继站后， 由目标中继站通知 DeNB路 径已改变， DeNB执行路径切换。
3、 根据权利要求 2所述的方法， 其特征在于， 步骤 B1具体为： Bll、 源中继站根据用户终端发送的测量报告执行切换判决；
B12、 源中继站允许用户终端切换时， 源中继站通过 X2接口向目标中 继站发送切换请求消息， 所述切换请求消息中携带源中继站的上下行链路 的用户面 GPRS隧道协议（ GTP-U )地址；
B13、目标中继站执行准许接入控制，目标中继站允许用户终端接入时， 通过 X2接口向源中继站发送切换请求响应消息，所述切换请求响应消息中 携带目标中继站的上下行链路的 GTP-U地址；
B14、 源中继站向用户终端 UE发送切换命令。
4、 根据权利要求 3所述的方法， 其特征在于， 步骤 B2具体为：
B21、 源中继站向目标中继站发送服务网络状态转换命令， 并将用户上 下文及緩存数据转发给目标中继站；
B23、 用户终端执行到目标中继站的同步， 所述目标中继站向用户终端 发送带有上行链路资源分配和定时提前量的网络响应。
5、 根据权利要求 2所述的方法， 其特征在于， 步骤 B3具体为： B31、在用户终端成功接入目标中继站后， 目标中继站向 DeNB发送下 行路径切换请求；
B32、 DeNB处理所述下行路径切换请求， 并向目标中继站发送下行路 径切换响应；
B33、 目标中继站通知源中继站释放用户终端上下文， 源中继站释放资 源。
6、 一种无线中继***中终端的移动性管理***， 包括用户终端、 属于 同一个 DeNB的源中继站和目标中继站及 DeNB ,其特征在于，所述源中继 站和目标中继站之间建立 X2接口， 通过所述 X2接口实现用户终端在所述 源中继站和目标中继站之间的小区切换。
7、 根据权利要求 6述的***， 其特征在于， 所述源基站包括： 切换判决模块， 用于根据用户终端发送测量报告执行切换判决； 切换请求模块，用于在允许用户终端切换的情况下通过 X2接口向目标 中继站发送切换请求消息， 所述切换请求消息中携带源中继站的上下行链 路的 GTP-U地址；
切换通知模块， 用于在目标中继站准许用户终端接入且接收到目标中 继站发送的切换请求响应消息后向用户终端发送切换命令；
网络状态转换通知模块， 用于向目标中继站发送服务网络状态转换命 令， 并将用户上下文及緩存数据转发给目标中继站。
8、 根据权利要求 7述的***， 其特征在于， 所述目标中继站包括： 准入执行模块， 用于根据源中继站的切换请求模块发送的切换请求消 息执行准许接入控制， 若准许用户终端接入则通知切换请求响应模块执行； 切换请求响应模块，用于通过 X2接口向源中继站发送切换请求响应消 息，所述切换请求响应消息中携带目标中继站的上下行链路的用户面 GPRS 隧道协议 GTP-U地址；
下行链路资源分配模块， 用于向用户终端发送带有上行链路资源分配 和定时提前量的网络响应以供用户终端执行到目标中继站的同步和接入； 路径切换请求模块， 用于在用户终端成功接入目标中继站后， 向 DeNB 发送下行路径切换请求；
资源释放通知模块， 用于在接收到所述下行路径切换请求后通知源中 继站释放用户终端上下文。
9、 根据权利要求 6述的***， 其特征在于， 所述 DeNB包括： 链路切换模块， 用于处理所述下行路径切换请求， 并向目标中继站发 送路径切换响应。
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