WO2011153889A1

WO2011153889A1 - Method and apparatus for implementing local handover

Info

Publication number: WO2011153889A1
Application number: PCT/CN2011/073980
Authority: WO
Inventors: 王静; 周娜; 梁爽; 霍玉臻
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-10
Filing date: 2011-05-12
Publication date: 2011-12-15
Also published as: CN102281600B; CN102281600A

Abstract

A method and an apparatus for implementing local handover are provided in the present invention, which both include: sending handover commands carrying information of a data shunt gateway to a target wireless access network element by a source wireless access network element, triggering the target wireless access network element to initiate tunnel update to the data shunt gateway. The method and apparatus of the present invention ensure that a terminal performs handover not via a core network, and the data roundabout via the core net does not exist, therefore effectively lighting load of control side signaling of the core net, and evidently reducing security hidden trouble of local data due to that the data relating to terminal handover is not via the core network.

Description

一种实现本地切换的方法和装置技术领域 Method and device for realizing local switching

本发明涉及通信领域，具体涉及一种实现本地切换的方法和装置。背景技术 The present invention relates to the field of communications, and in particular, to a method and apparatus for implementing local handover. Background technique

随着空口速率的不断提升，加之数据用户的增加，未来用户数据量会呈现爆发性的增长，这会对现有核心网网络造成冲击，现有核心网网元需要进行扩容以便为用户提供满意的服务。考虑到增长的数据多涉及 Internet 业务，移动运营商希望在不改变现有网络的基础上进行本地 internet数据分流，避免大量数据冲击核心网并且能够满足用户需求，由此提出了本地访问的概念。 As the air interface rate increases and the number of data users increases, the amount of future user data will increase explosively. This will impact the existing core network. The existing core network elements need to be expanded to provide users with satisfaction. Service. Considering that the increased data involves Internet services, mobile operators want to perform local Internet data distribution without changing the existing network, avoiding a large amount of data impacting the core network and meeting user needs, thus proposing the concept of local access.

家庭基站（HNB, Home NodeB ) 的引入扩展了本地访问的应用范围。家庭基站作为某些用户的专属资源，部署在家庭、团体、公司或者学校等私人场所，主要用于向用户提供更高的业务速率并降低使用高速率服务所需要的费用，同时弥补已有分布式蜂窝无线通信***覆盖的不足。用户可以通过家庭基站对家庭网络中的其它 IP设备、企业网络中的 IP设备进行访问，上述这种应用也称为本地访问，因为数据流也不会通过核心网进行发送。 The introduction of home base stations (HNB, Home NodeB) extends the range of applications for local access. As a dedicated resource for some users, the home base station is deployed in private places such as homes, groups, companies, or schools. It is mainly used to provide users with higher service rates and lower the cost of using high-speed services, while making up for existing distribution. Insufficient coverage of cellular wireless communication systems. The user can access other IP devices in the home network and IP devices in the enterprise network through the home base station. The above application is also called local access, because the data stream is not sent through the core network.

综上， 3GPP标准组织定义本地访问功能包括：应用于 Internet网络访问的选择 IP传输分流（Selected IP Traffic Offload, SIPTO )和应用于本地网络 IP设备访问的本地 IP接入（ Local IP Access , LIPA ) 两种。 In summary, the 3GPP standards organization defines local access functions including: Selected IP Traffic Offload (SIPTO) for Internet network access and Local IP Access (LIPA) for local network IP device access. Two.

为了实现本地访问功能，网络中增设了执行数据分流功能的网关。如图 1 所示，数据分流网关可以和无线接入网元合设或者设置在无线接入网元附近 (即外置），也可以和无线接入网关合设或者设置在无线接入网关附近（即外置）。对于支持本地访问的用户，可以同时建立传统的核心网访问数据路径和本地访问数据路径。 In order to implement the local access function, a gateway for performing data offloading is added to the network. As shown in Figure 1, the data offload gateway can be set up with the radio access network element or set in the vicinity of the radio access network element (that is, externally), or can be set up with the radio access gateway or set in the radio access gateway. Near (ie external). For users who support local access, traditional core network access data paths and local access data paths can be established at the same time.

对于本地访问的连接，本地访问数据路径从终端经由无线接入网元至数据分流网关，数据传输不经过核心网。为了实现终端对家庭网络中的其他 IP设备或者互联网的本地接入，可以建立两条本地访问连接，其中一条访问连接 (互联网 IP连接，也即 SIPTO连接 )的本地访问数据路径直接访问互联网，另一条访问连接 (家庭网络 IP连接，也即 LIPA连接）的本地访问数据路径直接访问家庭网络中的其他 IP设备。 For locally accessed connections, the local access data path from the terminal to the data offload gateway via the radio access network element, the data transmission does not pass through the core network. In order to realize local access of the terminal to other IP devices or the Internet in the home network, two local access connections may be established, and one access access (Internet IP connection, ie SIPTO connection) local access data path directly accesses the Internet, and A local access data path for an access connection (home network IP connection, ie LIPA connection) directly accesses other IP devices in the home network.

图 2所示为用于执行本地访问的***架构图，其中的数据分流网关可以和无线接入网元合设或者分设，本架构以家庭基站为例。家庭基站收到的用户上行本地访问数据从家庭基站与数据分流网关间的接口发送，数据分流网关收到的用户下行本地访问数据也从该接口发送，该接口具有 GTP-C和 GTP-U协议栈，目前尚未有标准化的名称。本地访问连接由控制面网元通过服务网关作用到数据分流网关以进行管理。分组数据网关用于转发核心网数据。核心网上下行数据通过家庭基站、服务网关、分组数据网关发送。架构中的 S1-MME、 Sl-U、 S5等接口均为标准化接口。 Figure 2 shows a system architecture diagram for performing local access. The data offload gateway can be set up or separated from the radio access network element. This architecture takes a home base station as an example. The user uplink local access data received by the home base station is sent from the interface between the home base station and the data offload gateway, and the downlink local access data received by the data offload gateway is also sent from the interface, and the interface has the GTP-C and GTP-U protocols. Stack, there is currently no standardized name. The local access connection is managed by the control plane network element through the service gateway to the data offload gateway. The packet data gateway is used to forward core network data. The core network downlink data is sent through the home base station, the serving gateway, and the packet data gateway. The interfaces such as S1-MME, Sl-U, and S5 in the architecture are standardized interfaces.

从部署场景看，终端在家庭基站间移动时可能会导致切换过程的发生，按照现有技术实现切换时需要由核心网参与建立数据的转发通道，使得本地数据的一部分可能会迂回到核心网。这种处理机制不仅增加核心网控制面信令的负荷，对本地数据来说也会增加安全隐患。发明内容 As shown in the deployment scenario, when the terminal moves between the home base stations, the handover process may occur. When the handover is implemented according to the prior art, the core network participates in the forwarding channel for establishing data, so that part of the local data may be returned to the core network. This processing mechanism not only increases the load on the control plane signaling of the core network, but also increases the security risks for local data. Summary of the invention

有鉴于此，本发明的主要目的在于提供一种实现本地切换的方法和装置，减轻核心网控制面信令的负荷。 In view of this, the main object of the present invention is to provide a method and apparatus for implementing local handover, which reduces the load on the control plane signaling of the core network.

为达到上述目的，本发明的技术方案是这样实现的： In order to achieve the above object, the technical solution of the present invention is achieved as follows:

一种实现本地切换的方法，该方法包括：源无线接入网元向目标无线接入网元发送携带数据分流网关信息的切换命令，触发目标无线接入网元向所述数据分流网关发起隧道更新。 A method for implementing local switching, the method comprising: The source radio access network element sends a handover command carrying the data offload gateway information to the target radio access network element, and triggers the target radio access network element to initiate a tunnel update to the data offload gateway.

发送所述切换命令的过程包括： The process of sending the switching command includes:

源无线接入网元通过无线接入网元间的控制面接口直接向目标无线接入网元发送所述切换命令； The source radio access network element directly sends the handover command to the target radio access network element through a control plane interface between the radio access network elements;

或者，源无线接入网元通过无线接入网元与无线接入网关之间的控制面接口，经由无线接入网关向目标无线接入网元发送所述切换命令。 Alternatively, the source radio access network element sends the handover command to the target radio access network element via the radio access gateway through a control plane interface between the radio access network element and the radio access gateway.

发送所述切换命令之前，该方法进一步包括： Before sending the switching command, the method further includes:

进行切换类型的判决，如果源无线接入网元与目标无线接入网元同属一个内部网络，则确定要启动本地切换过程，发送所述切换命令。 A handover type decision is made. If the source radio access network element and the target radio access network element belong to the same internal network, it is determined that the local handover procedure is to be initiated, and the handover command is sent.

无线接入网元间存在控制面接口时，由源无线接入网元进行切换类型的所述判决； When there is a control plane interface between the radio access network elements, the source radio access network element performs the decision of the handover type;

无线接入网元间不存在控制面接口，而是无线接入网元与无线接入网关之间存在控制面接口时，由无线接入网关进行切换类型的所述判决。 When there is no control plane interface between the radio access network elements, but the control plane interface exists between the radio access network element and the radio access gateway, the wireless access gateway performs the decision of the handover type.

所述切换命令是以切换请求的形式发送的，所述隧道更新的过程包括：目标无线接入网元向数据分流网关发送承载修改请求，数据分流网关根据收到的承载修改请求进行用于终端本地访问数据传输的隧道更新。 The handover command is sent in the form of a handover request. The tunnel update process includes: the target radio access network element sends a bearer modification request to the data offload gateway, and the data offload gateway performs the terminal according to the received bearer modification request. Local access to tunnel updates for data transfer.

所述切换命令携带有包含地址、网关标识、隧道标识在内的数据分流网关信息。 The handover command carries data offload gateway information including an address, a gateway identifier, and a tunnel identifier.

一种实现本地切换的装置，该装置包括本地切换触发单元、隧道更新单元；其中， A device for implementing local handover, the device includes a local handover trigger unit and a tunnel update unit;

所述本地切换触发单元，用于在确定进行本地切换时向所述隧道更新单元发送切换命令； The local handover triggering unit is configured to send a handover command to the tunnel update unit when determining to perform a local handover;

所述隧道更新单元，用于根据收到的切换命令，进行支持终端本地访问数据传输的隧道更新。无线接入网元间存在控制面接口时，所述本地切换触发单元与所述隧道更新单元直连，所述切换命令由所述本地切换触发单元直接发送到所述隧道更新单元； The tunnel update unit is configured to perform tunnel update that supports local access data transmission of the terminal according to the received handover command. When the control plane interface exists between the radio access network elements, the local handover trigger unit is directly connected to the tunnel update unit, and the handover command is directly sent by the local handover trigger unit to the tunnel update unit.

无线接入网元间不存在控制面接口，而是无线接入网元与无线接入网关之间存在控制面接口时，所述本地切换触发单元通过无线接入网关与所述隧道更新单元相连，所述切换命令由所述本地切换触发单元通过所述无线接入网关发送到所述隧道更新单元。 When there is no control plane interface between the radio access network elements, but the control plane interface exists between the radio access network element and the radio access gateway, the local handover trigger unit is connected to the tunnel update unit by using the radio access gateway. And the switching command is sent by the local handover triggering unit to the tunnel update unit by using the wireless access gateway.

该装置进一步包括切换判决单元，用于针对终端进行涉及终端切换的切换判断，以确定终端是否需要进行切换，并在确定需要切换时通知所述本地切换触发单元。 The apparatus further includes a handover decision unit for performing handover determination involving terminal handover for the terminal to determine whether the terminal needs to perform handover, and notifying the local handover trigger unit when it is determined that handover is required.

所述切换命令携带有包含地址、网关标识、隧道标识在内的数据分流网关信息； The handover command carries data offload gateway information including an address, a gateway identifier, and a tunnel identifier;

无线接入网元间存在控制面接口时，所述本地切换触发单元设置于源无线接入网元中；无线接入网元间不存在控制面接口，而是无线接入网元与无线接入网关之间存在控制面接口时，所述本地切换触发单元设置于无线接入网关中； When a control plane interface exists between the radio access network elements, the local handover trigger unit is disposed in the source radio access network element; the radio access network element does not have a control plane interface, but the radio access network element and the radio interface When the control plane interface exists between the ingress gateways, the local handover triggering unit is configured in the wireless access gateway;

所述隧道更新单元设置于目标无线接入网元中。 The tunnel update unit is disposed in the target radio access network element.

本发明方法和装置，能够有效减轻核心网控制面信令的负荷。附图说明 The method and device of the invention can effectively reduce the load of the control signal of the core network control plane. DRAWINGS

图 1为现有技术的本地访问和传统核心网访问的数据流路径示意图；图 2为现有技术中用于执行本地访问的***架构图； 1 is a schematic diagram of a data flow path of a local access and a traditional core network access in the prior art; FIG. 2 is a system architecture diagram for performing local access in the prior art;

图 3为本发明实施例一的实现本地切换的流程图； 3 is a flowchart of implementing local handover according to Embodiment 1 of the present invention;

图 4为本发明实施例二的实现本地切换的流程图； 4 is a flowchart of implementing local handover according to Embodiment 2 of the present invention;

图 5为本发明实施例三的实现本地切换的流程图； FIG. 5 is a flowchart of implementing local handover according to Embodiment 3 of the present invention;

图 6为本发明实现本地切换的流程简图；图 7为本发明一实施例的实现本地切换的装置图。具体实施方式 6 is a schematic flow chart of implementing local handover according to the present invention; FIG. 7 is a diagram of an apparatus for implementing local handover according to an embodiment of the present invention. detailed description

总体而言，可以使家庭基站间的切换在本地网络完成，不需要核心网参与，因此数据没有经由核心网的迂回。在具体应用时，源无线接入网元可以进行切换判决，选定切换类型。 In general, the handover between the home base stations can be completed on the local network without the core network participating, so the data is not bypassed via the core network. In a specific application, the source radio access network element can perform a handover decision and select a handover type.

具体而言，源无线接入网元可以根据目标家庭基站等目标无线接入网元的标识、闭合用户组（CSG ) ID、地址、网络标识等信息判定执行何种切换。如果目标无线接入网元与源无线接入网元同属一个内部网络，那么启动不经由核心网的本地切换，否则启动现有技术的核心网辅助切换。 Specifically, the source radio access network element may determine which handover to perform according to the identifier of the target radio access network element such as the target home base station, the closed subscriber group (CSG) ID, the address, the network identifier, and the like. If the target radio access network element and the source radio access network element belong to the same internal network, then the local handover without the core network is initiated, otherwise the core network assisted handover of the prior art is started.

启动本地切换时，源无线接入网元直接通过无线接入网元间接口向目标无线接入网元发送切换命令和緩存数据，所述切换命令包括数据分流网关的地址信息。目标无线接入网元根据收到的切换命令中的数据分流网关地址信息与数据分流网关进行交互，以进行用于支持终端本地访问数据传输的隧道更新，使后续的本地访问数据能够直接发送到目标无线接入网元。 When the local handover is initiated, the source radio access network element directly sends a handover command and cache data to the target radio access network element through the radio access network element interface, where the handover command includes the address information of the data offload gateway. The target radio access network element interacts with the data offload gateway according to the data offload gateway address information in the received handover command to perform tunnel update for supporting local access data transmission of the terminal, so that subsequent local access data can be directly sent to Target radio access network element.

所述无线接入网元包括家庭基站、宏基站等无线设备。无线接入网元间的控制面接口通常为标准化的 X2接口。针对无线接入网元而言，应用于家庭基站的家庭基站网关以及应用于宏基站的宏基站网关，可以统称为无线接入网关。 The radio access network element includes a wireless device such as a home base station and a macro base station. The control plane interface between the radio access network elements is usually a standardized X2 interface. For the radio access network element, the home base station gateway applied to the home base station and the macro base station gateway applied to the macro base station may be collectively referred to as a wireless access gateway.

上述操作思路可以表示如图 3至图 5所示。 The above operation ideas can be expressed as shown in Figure 3 to Figure 5.

参见图 3 , 图 3为本发明实施例一的实现本地切换的流程图。当终端处于连接状态时，本地访问用户数据在终端、源家庭基站和数据分流网关间传递。 Referring to FIG. 3, FIG. 3 is a flowchart of implementing local handover according to Embodiment 1 of the present invention. When the terminal is in the connected state, the local access user data is transferred between the terminal, the source home base station, and the data offload gateway.

图 3所示流程包括以下步骤： The process shown in Figure 3 includes the following steps:

步骤 301 : 源家庭基站发送测量控制消息给终端。 Step 301: The source home base station sends a measurement control message to the terminal.

步骤 302: 终端收到测量控制消息后向源家庭基站返回测量报告。其中包括用户相邻小区的信号强度、 CSG ID、小区标识、网络标识等信息。步骤 303:源家庭基站根据测量报告结合本地策略发现当前小区不适合用户接入，则选择合适的目标家庭基站进行用户切换并开始数据緩存。此时源家庭基站进行切换类型的判决，如果源家庭基站根据目标家庭基站的标识、 CSG ID、配置的地址信息、网络标识等发现与目标家庭基站同属一个内部网络，也即存在家庭基站间的控制面和用户面接口，那么启动本地切换过程；否则启动现有技术的核心网辅助切换过程。 Step 302: The terminal returns a measurement report to the source home base station after receiving the measurement control message. among them It includes information such as signal strength, CSG ID, cell identifier, and network identifier of the neighboring cell of the user. Step 303: The source home base station finds that the current cell is not suitable for user access according to the measurement report and the local policy, and then selects a suitable target home base station to perform user switching and starts data buffering. At this time, the source home base station performs the handover type decision. If the source home base station finds that it belongs to the same internal network as the target home base station according to the identity of the target home base station, the CSG ID, the configured address information, and the network identifier, that is, there is a home base station. The control plane and the user plane interface, then start the local handover process; otherwise, the prior art core network assisted handover process is started.

步骤 304: 当确定要启动本地切换过程时，源家庭基站直接向目标家庭基站发送切换请求消息，该消息中携带数据分流网关的信息，包括地址、网关标识、隧道标识等。 Step 304: When it is determined that the local handover process is to be started, the source home base station directly sends a handover request message to the target home base station, where the message carries information of the data offload gateway, including an address, a gateway identifier, a tunnel identifier, and the like.

步骤 305: 目标家庭基站预留无线资源后返回切换请求确认消息。步骤 306: 源家庭基站通过 RRC连接重配置消息指示终端进行切换。步骤 307: 终端同步到目标家庭基站下的小区，源家庭基站向目标家庭基站发送緩存的用户数据。目标家庭基站根据数据分流网关的 TEID信息等将用户上行数据发送到数据分流网关，所述用户上行数据包括緩存的用户上行数据及用户向目标家庭基站发出的上行数据。緩存的下行数据此时可以通过无线承载发送到终端。 Step 305: The target home base station returns a handover request acknowledgement message after reserving the radio resource. Step 306: The source home base station instructs the terminal to perform handover by using an RRC connection reconfiguration message. Step 307: The terminal synchronizes to the cell under the target home base station, and the source home base station sends the buffered user data to the target home base station. The target home base station sends the user uplink data to the data offload gateway according to the TEID information of the data offload gateway, and the user uplink data includes the cached user uplink data and the uplink data sent by the user to the target home base station. The buffered downlink data can be sent to the terminal through the radio bearer at this time.

步骤 308: 目标家庭基站发送承载修改请求消息至数据分流网关，其中包括目标家庭基站的下行 TEID信息。此时数据分流网关不再向源家庭基站发送下行数据，转而向目标家庭基站发送；并且，数据分流网关釆用数据终结标识指示源家庭基站数据终结，以便数据在目标家庭基站进行排序。 Step 308: The target home base station sends a bearer modification request message to the data offload gateway, where the downlink TEID information of the target home base station is included. At this time, the data offloading gateway no longer sends the downlink data to the source home base station, and then sends the data to the target home base station; and the data offload gateway uses the data termination identifier to indicate that the source home base station data is terminated, so that the data is sorted at the target home base station.

步骤 309:数据分流网关根据收到的承载修改请求消息进行用于支持终端本地访问数据传输的隧道更新，之后向目标家庭基站回复承载修改请求响应消息，告知目标家庭基站隧道更新完成。 Step 309: The data offloading gateway performs a tunnel update for supporting the terminal local access data transmission according to the received bearer modification request message, and then returns a bearer modification request response message to the target home base station to notify the target home base station that the tunnel update is completed.

步骤 310: 源家庭基站发送路径交换请求消息给核心网控制面网元，以通知核心网控制面网元终端切换完毕。所述核心网控制面网元可以表现为不同的装置，如 MME、 SGSN等。 Step 310: The source home base station sends a path exchange request message to the core network control plane network element, The core network control plane of the control plane is notified to be switched. The core network control plane network element may be represented by different devices, such as an MME, an SGSN, and the like.

步骤 311 : 核心网控制面网元回复路径交换响应消息。 Step 311: The core network control plane network element returns a path exchange response message.

步骤 312: 目标家庭基站指示源家庭基站进行无线资源释放。 Step 312: The target home base station instructs the source home base station to perform radio resource release.

参见图 4, 图 4为本发明实施例二的实现本地切换的流程图。本实施例为有家庭基站网关部署的场景，并且家庭基站间不存在直接的控制面接口，而存在直接的用户面接口。家庭基站仅与家庭基站网关间存在控制面接口。 Referring to FIG. 4, FIG. 4 is a flowchart of implementing local handover according to Embodiment 2 of the present invention. This embodiment is a scenario in which a home base station gateway is deployed, and there is no direct control plane interface between the home base stations, and there is a direct user plane interface. The home base station only has a control plane interface with the home base station gateway.

当终端处于连接状态时，本地访问用户数据在终端、源家庭基站和数据分流网关间传递。 When the terminal is in the connected state, the local access user data is transferred between the terminal, the source home base station, and the data offload gateway.

图 4所示流程包括以下步骤： The process shown in Figure 4 includes the following steps:

步骤 401 : 源家庭基站发送测量控制消息给终端。 Step 401: The source home base station sends a measurement control message to the terminal.

步骤 402: 终端收到测量控制消息后向源家庭基站返回测量报告。其中包括用户相邻小区的信号强度、 CSG ID、小区标识、网络标识等信息。 Step 402: The terminal returns a measurement report to the source home base station after receiving the measurement control message. It includes information such as signal strength, CSG ID, cell identifier, and network identifier of the neighboring cell of the user.

步骤 403:源家庭基站根据测量报告结合本地策略发现当前小区不适合用户接入，则选择合适的目标家庭基站进行用户切换并开始数据緩存。 Step 403: The source home base station finds that the current cell is not suitable for user access according to the measurement report and the local policy, and then selects a suitable target home base station to perform user switching and starts data buffering.

步骤 404: 源家庭基站向家庭基站网关发送切换请求消息，其中携带数据分流网关信息，具体包括：地址、网关标识、隧道标识等。 Step 404: The source home base station sends a handover request message to the home base station gateway, where the data distribution gateway information is carried, including: an address, a gateway identifier, a tunnel identifier, and the like.

步骤 405: 家庭基站网关进行切换类型的判决，如果家庭基站网关根据目标家庭基站的标识、 CSG ID、配置的地址信息、网络标识等发现与源家庭基站同属一个内部网络，即存在家庭基站间的用户面接口，那么启动本地切换过程；否则启动现有技术的核心网辅助切换过程。 Step 405: The home base station gateway performs a handover type decision. If the home base station gateway finds that the source home base station belongs to an internal network according to the identity of the target home base station, the CSG ID, the configured address information, and the network identifier, that is, there is a home base station. User plane interface, then start the local handover process; otherwise, start the core network assisted handover process of the prior art.

步骤 406: 当确定要启动本地切换过程时，家庭基站网关向目标家庭基站发送切换请求消息，其中携带数据分流网关信息。 Step 406: When it is determined that the local handover procedure is to be initiated, the home base station gateway sends a handover request message to the target home base station, where the data offload gateway information is carried.

步骤 407: 目标家庭基站预留无线资源后向家庭基站网关返回切换请求确认消息。步骤 408: 家庭基站网关向源家庭基站返回切换请求确认消息。 Step 407: The target home base station returns a handover request acknowledgement message to the home base station gateway after reserving the radio resource. Step 408: The home base station gateway returns a handover request acknowledgement message to the source home base station.

步骤 409: 源家庭基站通过 RRC连接重配置消息指示终端进行切换。步骤 410: 终端同步到目标家庭基站小区，源家庭基站向目标家庭基站发送緩存的用户数据。目标家庭基站根据数据分流网关的 TEID信息等将用户上行数据发送到数据分流网关，所述用户上行数据包括緩存的用户上行数据及用户向目标家庭基站发出的上行数据。緩存的下行数据此时可以通过无线承载发送到终端。 Step 409: The source home base station instructs the terminal to perform handover by using an RRC connection reconfiguration message. Step 410: The terminal synchronizes to the target home base station cell, and the source home base station sends the buffered user data to the target home base station. The target home base station sends the user uplink data to the data offload gateway according to the TEID information of the data offload gateway, and the user uplink data includes the cached user uplink data and the uplink data sent by the user to the target home base station. The buffered downlink data can be sent to the terminal through the radio bearer at this time.

步骤 411 : 目标家庭基站发送承载修改请求消息至数据分流网关，其中包括目标家庭基站的下行 TEID信息。此时数据分流网关不再向源家庭基站发送下行数据，转而向目标家庭基站发送；并且数据分流网关釆用数据终结标识指示源家庭基站数据终结，以便数据在目标家庭基站进行排序。 Step 411: The target home base station sends a bearer modification request message to the data offload gateway, where the downlink TEID information of the target home base station is included. At this time, the data offloading gateway no longer sends the downlink data to the source home base station, and then sends the data to the target home base station; and the data offload gateway uses the data termination identifier to indicate that the source home base station data is terminated, so that the data is sorted at the target home base station.

步骤 412:数据分流网关根据收到的承载修改请求消息进行用于支持终端本地访问数据传输的隧道更新，之后向目标家庭基站回复承载修改请求响应消息，告知目标家庭基站隧道更新完成。 Step 412: The data offloading gateway performs a tunnel update for supporting the terminal local access data transmission according to the received bearer modification request message, and then returns a bearer modification request response message to the target home base station to notify the target home base station that the tunnel update is complete.

步骤 413: 源家庭基站发送路径交换请求消息给核心网控制面网元，以通知核心网控制面网元终端切换完毕。 Step 413: The source home base station sends a path switching request message to the network element of the core network control plane to notify the core network control plane that the network element terminal has completed the handover.

步骤 414: 核心网控制面网元回复路径交换响应消息。 Step 414: The core network control plane network element replies with a path exchange response message.

步骤 415: 目标家庭基站指示源家庭基站进行无线资源释放。 Step 415: The target home base station instructs the source home base station to perform radio resource release.

参见图 5 , 图 5为本发明实施例三的实现本地切换的流程图。本实施例为有家庭基站网关部署的场景，并且家庭基站间不存在直接的控制面接口，也不存在直接的用户面接口；所有用户面、控制面的信息都由家庭基站网关转发。 Referring to FIG. 5, FIG. 5 is a flowchart of implementing local handover according to Embodiment 3 of the present invention. This embodiment is a scenario in which a home base station gateway is deployed, and there is no direct control plane interface between the home base stations, and there is no direct user plane interface; all user plane and control plane information are forwarded by the home base station gateway.

图 5所示流程包括以下步骤：步骤 501 : 源家庭基站发送测量控制消息给终端。 The process shown in Figure 5 includes the following steps: Step 501: The source home base station sends a measurement control message to the terminal.

步骤 502: 终端收到测量控制消息后向源家庭基站返回测量报告。其中包括用户相邻小区的信号强度、 CSG ID、小区标识、网络标识等信息。 Step 502: The terminal returns a measurement report to the source home base station after receiving the measurement control message. It includes information such as signal strength, CSG ID, cell identifier, and network identifier of the neighboring cell of the user.

步骤 503:源家庭基站根据测量报告结合本地策略发现当前小区不适合用户接入，则选择合适的目标家庭基站进行用户切换并开始数据緩存。 Step 503: The source home base station finds that the current cell is not suitable for user access according to the measurement report and the local policy, and then selects a suitable target home base station to perform user switching and starts data buffering.

步骤 504: 源家庭基站向家庭基站网关发送切换请求消息，其中携带数据分流网关信息，具体包括：地址、网关标识、隧道标识等。 Step 504: The source home base station sends a handover request message to the home base station gateway, where the data distribution gateway information is carried, including: an address, a gateway identifier, a tunnel identifier, and the like.

步骤 505: 家庭基站网关进行切换类型的判决，如果家庭基站网关根据目标家庭基站的标识、 CSG ID、配置的地址信息、网络标识等发现与源家庭基站同属一个内部网络，即存在家庭基站间的用户面接口，那么启动本地切换过程；否则启动现有技术的核心网辅助切换过程。 Step 505: The home base station gateway performs a handover type decision. If the home base station gateway finds that the source home base station belongs to an internal network according to the identity of the target home base station, the CSG ID, the configured address information, and the network identifier, that is, the home base station exists. User plane interface, then start the local handover process; otherwise, start the core network assisted handover process of the prior art.

步骤 506: 当确定要启动本地切换过程时，家庭基站网关向目标家庭基站发送切换请求消息，其中携带数据分流网关信息。 Step 506: When it is determined that the local handover procedure is to be initiated, the home base station gateway sends a handover request message to the target home base station, where the data offload gateway information is carried.

步骤 507: 目标家庭基站预留无线资源后向家庭基站网关返回切换请求确认消息。 Step 507: The target home base station returns a handover request acknowledgement message to the home base station gateway after reserving the radio resource.

步骤 508: 家庭基站网关向源家庭基站返回切换请求确认消息。 Step 508: The home base station gateway returns a handover request acknowledgement message to the source home base station.

步骤 509: 源家庭基站通过 RRC连接重配置消息指示终端进行切换。步骤 510: 终端同步到目标家庭基站小区，源家庭基站向目标家庭基站发送緩存的用户数据，该用户数据通过家庭基站网关转发。目标家庭基站根据数据分流网关的 TEID信息等将用户上行数据发送到数据分流网关，所述用户上行数据包括緩存的用户上行数据及用户向目标家庭基站发出的上行数据。緩存的下行数据此时可以通过无线承载发送到终端。 Step 509: The source home base station instructs the terminal to perform handover by using an RRC connection reconfiguration message. Step 510: The terminal synchronizes to the target home base station cell, and the source home base station sends the buffered user data to the target home base station, where the user data is forwarded through the home base station gateway. The target home base station sends the user uplink data to the data offload gateway according to the TEID information of the data offload gateway, and the user uplink data includes the cached user uplink data and the uplink data sent by the user to the target home base station. The buffered downlink data can be sent to the terminal through the radio bearer at this time.

步骤 511 : 目标家庭基站发送承载修改请求消息至数据分流网关，其中包括目标家庭基站的下行 TEID信息。此时数据分流网关不再向源家庭基站发送下行数据，转而向目标家庭基站发送；并且数据分流网关釆用数据终结标识指示源家庭基站数据终结，以便数据在目标家庭基站进行排序。步骤 512:数据分流网关根据收到的承载修改请求消息进行用于支持终端本地访问数据传输的隧道更新，之后向目标家庭基站回复承载修改请求响应消息，告知目标家庭基站隧道更新完成。 Step 511: The target home base station sends a bearer modification request message to the data offload gateway, where the downlink TEID information of the target home base station is included. At this time, the data offload gateway no longer sends downlink data to the source home base station, and then sends the data to the target home base station; and the data offload gateway uses the data end The knot identifier indicates that the source home base station data is terminated so that the data is sorted at the target home base station. Step 512: The data offloading gateway performs a tunnel update for supporting the local access data transmission of the terminal according to the received bearer modification request message, and then returns a bearer modification request response message to the target home base station to notify the target home base station that the tunnel update is completed.

步骤 513: 源家庭基站发送路径交换请求消息给核心网控制面网元，以通知核心网控制面网元终端切换完毕。 Step 513: The source home base station sends a path exchange request message to the control unit network element of the core network, to notify the core network control plane that the network element terminal has completed the handover.

步骤 514: 核心网控制面网元回复路径交换响应消息。 Step 514: The core network control plane network element replies with a path exchange response message.

步骤 515: 目标家庭基站指示源家庭基站进行无线资源释放。 Step 515: The target home base station instructs the source home base station to perform radio resource release.

上述各流程中所描述的数据分流网关的信息，可以在消息中直接发送或者通过消息中的透明容器传递。另外，上述的基站可以是不同网络对应接入网部分的基站，如家庭基站、宏基站等。核心网控制面网元和数据分流网关在不同网络中可能具有不同的名称，例如在 EPS***中核心网控制面网元为 MME、数据分流网关为本地 P-GW; 而在 3G GPRS***中核心网控制面网元为 SGSN、数据分流网关为本地 GGSN。 The information of the data offload gateway described in the above processes may be directly sent in the message or transmitted through a transparent container in the message. In addition, the foregoing base stations may be base stations of different network corresponding access network parts, such as a home base station, a macro base station, and the like. The core network control plane network element and the data offload gateway may have different names in different networks. For example, in the EPS system, the core network control plane network element is the MME, and the data offload gateway is the local P-GW; and in the 3G GPRS system core The network control plane network element is the SGSN, and the data offload gateway is the local GGSN.

结合上述各流程可见，本发明实现本地切换的操作思路可以表示如图 6 所示。参见图 6, 图 6为本发明实现本地切换的流程简图，该流程包括以下步骤： As shown in the foregoing, the operation of the present invention to implement local handover can be represented as shown in FIG. 6. Referring to FIG. 6, FIG. 6 is a schematic flowchart of implementing local handover according to the present invention, where the process includes the following steps:

步骤 610: 终端进行切换时，源无线接入网元通过无线接入网元间接口向目标无线接入网元发送切换命令。 Step 610: When the terminal performs handover, the source radio access network element sends a handover command to the target radio access network element through the radio access network element interface.

步骤 620: 目标无线接入网元根据收到的切换命令，与数据分流网关进行用于支持终端本地访问数据传输的隧道更新。 Step 620: The target radio access network element performs a tunnel update for supporting the local access data transmission of the terminal with the data offload gateway according to the received handover command.

为了保证上述流程能够顺利进行，可以进行如图 7所示的设置。参见图 7, 图 7为本发明一实施例的实现本地切换的装置图，该装置包括相连的切换判决单元、本地切换触发单元、隧道更新单元。 In order to ensure that the above process can proceed smoothly, the settings shown in Figure 7 can be performed. Referring to FIG. 7, FIG. 7 is a diagram of an apparatus for implementing local handover according to an embodiment of the present invention, where the apparatus includes a connected handover decision unit, a local handover trigger unit, and a tunnel update unit.

切换判决单元通常设置于源家庭基站等源无线接入网元中。本地切换触发单元的设置位置则比较灵活，如：当没有部署有家庭基站网关，并且家庭基站等无线接入网元间存在直接的控制面接口时，本地切换触发单元可以设置于源无线接入网元中；当部署有家庭基站网关，并且家庭基站等无线接入网元间不存在直接的控制面接口时，本地切换触发单元可以设置于家庭基站网关中。隧道更新单元通常设置于目标无线接入网元或数据分流网关中。当然，上述各单元也可以分别独立设置，只要各单元能够通过通信交互顺利实现终端的本地切换即可。 The handover decision unit is usually set in a source radio access network element such as a source home base station. Local switching The setting of the triggering unit is more flexible. For example, when there is no home base station gateway and a direct control plane interface exists between the radio access network elements such as the home base station, the local switching trigger unit can be set to the source radio access network element. When the home base station gateway is deployed, and there is no direct control plane interface between the radio access network elements such as the home base station, the local handover triggering unit may be set in the home base station gateway. The tunnel update unit is usually disposed in the target radio access network element or the data offload gateway. Of course, each of the above units may be separately set, as long as each unit can smoothly implement local switching of the terminal through communication interaction.

具体应用时，切换判决单元能够针对终端进行涉及终端切换的切换判断等操作，以确定终端是否需要进行切换，并在确定需要切换时通知本地切换触发单元。本地切换触发单元判断终端是否能够进行不经由核心网的本地切换，并在确定可以进行本地切换时通知隧道更新单元，由隧道更新单元进行用于支持终端切换的隧道更新。为了保证隧道更新能够顺利进行，在确定可以进行本地切换时，针对隧道更新单元的通知中应该包含数据分流网关的信息，当本地切换触发单元确定终端需要进行本地切换时，可以向隧道更新单元发送包含数据分流网关信息的切换命令 (如：切换请求；)；隧道更新单元可以根据所述数据分流网关信息向数据分流网关发送表明终端要进行本地切换的通知，以触发数据分流网关进行用于支持终端本地访问数据传输的隧道更新。 In a specific application, the handover decision unit can perform operations such as handover determination involving terminal handover for the terminal to determine whether the terminal needs to perform handover, and notify the local handover trigger unit when it is determined that the handover is required. The local handover trigger unit determines whether the terminal is capable of performing local handover without the core network, and notifies the tunnel update unit when it is determined that local handover is possible, and the tunnel update unit performs tunnel update for supporting the handover of the terminal. In order to ensure that the tunnel update can be smoothly performed, when the local handover is determined, the notification for the tunnel update unit should include the information of the data offload gateway. When the local handover trigger unit determines that the terminal needs to perform local handover, it may send the information to the tunnel update unit. a switching command including a data offload gateway information (eg, a handover request;); the tunnel update unit may send a notification to the data offload gateway indicating that the terminal is to perform local handover according to the data offload gateway information, to trigger the data offload gateway to perform support Terminal local access to tunnel updates for data transmission.

上述各单元所能执行的具体操作已经在前述的各流程中详细描述，在此不再赘述。 The specific operations that can be performed by the above units have been described in detail in the foregoing various processes, and are not described herein again.

综上所述可见，无论是方法还是装置，本发明实现本地切换的技术，均可保证终端进行不经由核心网的切换，不存在经由核心网的数据迂回，因而能够有效减轻核心网控制面信令的负荷。并且，由于终端切换所涉及的数据不经由核心网，因此能够明显降低对本地数据的安全隐患。 In summary, the method for implementing local handover can ensure that the terminal performs handover without the core network and does not have data bypass via the core network, thereby effectively reducing the core network control surface information. The load of the order. Moreover, since the data involved in the terminal handover does not pass through the core network, the security risk against the local data can be significantly reduced.

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，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。 The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. All modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

权利要求书 Claim

1、一种实现本地切换的方法，其特征在于，该方法包括： A method for implementing local switching, the method comprising:

源无线接入网元向目标无线接入网元发送携带数据分流网关信息的切换命令，触发目标无线接入网元向所述数据分流网关发起隧道更新。 The source radio access network element sends a handover command carrying the data offload gateway information to the target radio access network element, and triggers the target radio access network element to initiate a tunnel update to the data offload gateway.

2、根据权利要求 1所述的方法，其特征在于，发送所述切换命令的过程包括： 2. The method according to claim 1, wherein the process of transmitting the switching command comprises:

3、根据权利要求 2所述的方法，其特征在于，发送所述切换命令之前，该方法进一步包括： The method according to claim 2, wherein before the sending the switching command, the method further comprises:

4、根据权利要求 3所述的方法，其特征在于： 4. The method of claim 3, wherein:

5、根据权利要求 1至 4任一项所述的方法，其特征在于，所述切换命令是以切换请求的形式发送的，所述隧道更新的过程包括：目标无线接入网元向数据分流网关发送承载修改请求，数据分流网关根据收到的承载修改请求进行用于终端本地访问数据传输的隧道更新。 The method according to any one of claims 1 to 4, wherein the handover command is sent in the form of a handover request, and the process of the tunnel update includes: offloading data from a target radio access network element The gateway sends a bearer modification request, and the data offload gateway performs tunnel update for the terminal local access data transmission according to the received bearer modification request.

6、根据权利要求 1至 4任一项所述的方法，其特征在于，所述切换命令携带有包含地址、网关标识、隧道标识在内的数据分流网关信息。 The method according to any one of claims 1 to 4, wherein the handover command carries data offload gateway information including an address, a gateway identifier, and a tunnel identifier.

7、一种实现本地切换的装置，其特征在于，该装置包括本地切换触发单元、隧道更新单元；其中， A device for implementing local switching, wherein the device comprises a local switching trigger unit and a tunnel updating unit;

所述隧道更新单元，用于根据收到的切换命令，进行支持终端本地访问数据传输的隧道更新。 The tunnel update unit is configured to perform tunnel update that supports local access data transmission of the terminal according to the received handover command.

8、根据权利要求 7所述的装置，其特征在于： 8. Apparatus according to claim 7 wherein:

无线接入网元间存在控制面接口时，所述本地切换触发单元与所述隧道更新单元直连，所述切换命令由所述本地切换触发单元直接发送到所述隧道更新单元； When there is a control plane interface between the radio access network elements, the local handover trigger unit is directly connected to the tunnel update unit, and the handover command is directly sent by the local handover trigger unit to the tunnel update unit;

9、根据权利要求 7或 8所述的装置，其特征在于，该装置进一步包括切换判决单元，用于针对终端进行涉及终端切换的切换判断，以确定终端是否需要进行切换，并在确定需要切换时通知所述本地切换触发单元。 The device according to claim 7 or 8, wherein the device further comprises a handover decision unit, configured to perform handover determination involving terminal handover for the terminal, to determine whether the terminal needs to perform handover, and determine that handover is needed. The local switching trigger unit is notified.

10、根据权利要求 7或 8所述的装置，其特征在于，所述切换命令携带有包含地址、网关标识、隧道标识在内的数据分流网关信息； The device according to claim 7 or 8, wherein the handover command carries data offload gateway information including an address, a gateway identifier, and a tunnel identifier;