WO2011079667A1

WO2011079667A1 - Local internet protocol (ip) access or selected internet protocol traffic offload establishment method and system

Info

Publication number: WO2011079667A1
Application number: PCT/CN2010/079098
Authority: WO
Inventors: 朱春晖; 宗在峰; 冯钢
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-12-28
Filing date: 2010-11-24
Publication date: 2011-07-07
Also published as: CN102111748B; CN102111748A

Abstract

The present invention provides a Local Internet Protocol Access (LIPA) or Selected Internet Protocol Traffic Offload (SIPTO) establishment method and system. The method includes the following steps: a user terminal is handed over from a source base station to a target base station; an LIPA or SIPTO from the user terminal to a first local gateway via the target base station is released, and an LIPA or SIPTO from the user terminal to a second local gateway via the target base station is established. With the present invention, the network resource consumption and the user data transmission delay are reduced, and the user experience is improved.

Description

本地 IP连接或选择的互联网协议流量分流建立方法及*** 技术领域本发明涉及通信领域，具体而言，涉及一种本地互联网协议连接（Local Internet Protocol Access,简称为 LIPA )或选择的互联网协议流量分流（ Selected IP Traffic Offload, 简称为 SIPTO ) 建立方法及***。背景技术移动通信网络包括基站子***、移动性管理实体、核心网网关和归属用户服务器，相关技术中移动通信网络的连接关系如图 1所示。移动性管理实体负责移动性管理、非接入层信令的处理和用户移动管理上下文的管理等控制面的相关工作；核心网网关包括月艮务网关（ Serving Gateway,简称为 S-GW ) 和分组数据网络网关（ Packet Data Network Gateway , 简称为 P-GW ) , S-GW 是与演进的通用移动通信***陆地无线接入网（ Evolved Universal Terrestrial Radio Access Network,简称为 E-UTRAN )相连的接入网关设备，在 E-UTRAN 和 P-GW之间转发数据，并且负责对寻呼等待数据进行緩存； P-GW则是演进的分组***（ Evolved Packet System , 简称为 EPS )与分组数据网络 ( Packet Data Network, 简称为 PDN )的边界网关，负责 PDN的接入及在 EPS与 PDN 间转发数据等功能。除了支持移动核心网络的接入以外，移动通信***还可支持本地 IP访问功能 ,在基站具备本地 IP访问能力以及用户签约允许本地 IP访问的条件下 , 可实现终端对家用网络中的其他 IP设备或者互联网的本地接入。在移动通信网络中，可以通过增设本地网关（ Local Gateway, 简称为 L-GW ) 以提供对本地 IP访问技术的支持， L-GW可以是本地 S-GW ( Local S-GW, 简称为 L-SGW ) 和本地 P-GW ( Local P-GW, 简称为 L-PGW ), 也可以是单独的 L-PGW,本地网关可与基站进行合设。对于通用陆地无线接入网络（ Universal Terrestrial Radio Access Network , 简称为 UTRAN ) ***， L-GW可以是本地网关 GPRS支持节点（ Local Gateway GPRS Support Node, 简称为 L-GGSN ) 和本地月艮务 GPRS 支持节点（Local Serving GPRS Support Node, 简称为 L-SGSN ), 也可以是单独的 L-GGSN。基站子***可以是 E-UTRAN的演进的基站（Evolved Node B, 简称为 eNodeB ) 和全球陆上无线接入 ( Universal Terrestrial Radio Access, 简称为 UTRAN ) /增强的全球移动通信***无线接入网络（ GSM EDGE Radio Access Network, 简称为 GERAN )的无线网络控制器（ RNC ) /基站控制器（ BSC ), 或者家庭基站（ HNB/HeNB )和家庭基站网关（ HNB GW/HeNB GW )。当存在家庭基站网关的情况下，本地网关不仅可与家庭基站进行合设，也可与家庭基站网关进行合设，此外，家庭基站网关还可以与家庭基站进行合设。在相关技术中，在上述网络架构下，用户连接到网络时，基站会为用户建立到本地网关 L-GW1 (靠近用户的网关）的连接，并为该用户分配一个 IP 地址，当用户发生移动，从源基站接入目标基站时，相关技术中还需要将目标基站连接到 L-GW1 (靠近用户的网关）。由于 L-GW1 (靠近用户的网关）能够覆盖的地理范围是有限的，且该用户的地理位置已经发生移动，仍将目标基站连接到 L-GW1 (靠近用户的网关）极易导致用户的路由不优化，从而导致不必要的网络资源消耗及用户数据传输的延迟的增加，影响了用户的体验。发明内容本发明的主要目的在于提供一种 LIPA或 SIPTO建立方法及***，以解决在用户在发生移动后，接入不同基站下仍然连接到先前的本地网关导致路由不优化的问题。根据本发明的一个方面，提供了一种 LIPA或 SIPTO建立方法，包括：用户终端从源基站切换到目标基站；释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO , 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或 SIPTO, 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO之前，上述方法还包括：确定目标基站到第一本地网关之间的路由不符合预定条件，并且存在与目标基站之间的路由符合预定条件的第二本地网关，其中，预定条件包括：目标基站下的用户终端的当前位置在本地网关的预定地域范围之内。优选地，确定目标基站到第一本地网关之间的路由不符合预定条件，并且存在与目标基站之间的路由符合预定条件的第二本地网关包括：移动性管理实体获取用户终端的当前位置；移动性管理实体确定用户终端的当前位置在第一本地网关的预定地域范围之外，并确定与目标基站连接的本地网关中符合预定条件的第二本地网关；或者，目标基站确定符合预定条件的第二本地网关，并将第二本地网关的 IP地址发送至移动性管理实体，移动性管理实体判断第二本地网关的 IP地址与第一本地网关的 IP地址不同，则确定第一本地网关不符合预定条件。优选地，移动性管理实体获取用户终端的当前位置包括：处于空闲态的用户终端移动到目标基站覆盖的区域内，并判断来自目标基站的空中接口广播消息中携带的当前位置跟踪区不在来自移动性管理实体的跟踪区列表中，则用户终端发起跟踪区更新请求，目标基站在跟踪区更新请求中携带用户终端的当前位置信息，并发送至移动性管理实体；或者，处于连接态的用户终端移动到目标基站覆盖的区域内，进行跨基站之间的接口 X2切换，目标基站将用户终端的当前位置发送至移动性管理实体；或者，处于连接态的用户终端移动到目标基站覆盖的区域内，进行跨基站的与服务网关之间的接口 S 1 切换，源基站将用户终端的当前位置发送至移动性管理实体。优选地，移动性管理实体获取用户终端的当前位置之后，上述方法还包括：目标基站第二本地网关的信息发送至移动性管理实体，其中，第二本地网关是由目标基站预先配置的。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或 SIPTO, 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO包括：移动性管理实体向第二本地网关发起建立会话请求，其中，建立会话请求携带有用户终端与第一本地网关之间的 PDN 连接的接入点名称；第二本地网关向移动性管理实体发送建立会话回复，其中，建立会话回复携带有第二本地网关为用户终端分配的 IP地址；移动性管理实体向第一本地网关发起删除会话请求。优选地，确定目标基站到第一本地网关之间的路由不符合预定条件包括：第一本地网关从移动性管理实体接收用户终端的当前位置，第一本地网关检查用户终端的当前位置超出第一本地网关的预定地址范围；释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO包括：第一本地网关向移动性管理实体发送删除承载请求后，移动性管理实体向第一本地网关发送删除承载回复，其中，删除承载请求的原因值为第一本地网关取消为 UE提供月艮务，并指示 UE重新连接；建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO 包括：移动性管理实体向第二本地网关发送建立会话请求，第二本地网关向移动性管理实体发送建立会话回复，其中，建立会话请求携带有用户终端与第一本地网关之间的 PDN 连接的接入点名称，建立会话回复携带有第二本地网关为用户终端分配的 IP地址。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a Local Internet Protocol Access (LIPA) or a selected Internet Protocol traffic offload. (Selected IP Traffic Offload, referred to as SIPTO) Establish method and system. BACKGROUND OF THE INVENTION A mobile communication network includes a base station subsystem, a mobility management entity, a core network gateway, and a home subscriber network. The connection relationship of the mobile communication network in the related art is as shown in FIG. 1. The mobility management entity is responsible for the control planes such as mobility management, non-access stratum signaling processing, and user mobility management context management; the core network gateway includes a Serving Gateway (S-GW) and Packet Data Network Gateway (P-GW), which is connected to the Evolved Universal Terrestrial Radio Access Network (E-UTRAN). Incoming gateway device, forwarding data between E-UTRAN and P-GW, and responsible for buffering paging waiting data; P-GW is Evolved Packet System (EPS) and packet data network ( Packet Data Network (referred to as PDN) border gateway, responsible for PDN access and forwarding data between EPS and PDN. In addition to supporting access to the mobile core network, the mobile communication system can also support local IP access functions. Under the condition that the base station has local IP access capability and the user subscribes to allow local IP access, the terminal can implement other IP devices in the home network. Or local access to the Internet. In the mobile communication network, a local gateway (Local Gateway, L-GW for short) may be added to provide support for the local IP access technology. The L-GW may be a local S-GW (Local S-GW, referred to as L-. The SGW) and the local P-GW (Local P-GW, referred to as L-PGW) may also be separate L-PGWs, and the local gateway may be combined with the base station. For a Universal Terrestrial Radio Access Network (UTRAN) system, the L-GW can be a Local Gateway GPRS Support Node (L-GGSN) and a local GPRS support. The Local Serving GPRS Support Node (L-SGSN for short) may also be a separate L-GGSN. The base station subsystem may be an evolved base station of E-UTRAN (Evolved Node B, referred to as eNodeB) and Global Terrestrial Radio Access (UTRAN) / Enhanced Global System for Mobile Communications (GSM) GSM Radio Access Network (RGRAN) Radio Network Controller (RNC) / Base station controller (BSC), or home base station (HNB/HeNB) and home base station gateway (HNB GW/HeNB GW). When there is a home base station gateway, the local gateway can be configured not only with the home base station but also with the home base station gateway. In addition, the home base station gateway can also be combined with the home base station. In the related art, in the above network architecture, when a user connects to the network, the base station establishes a connection to the local gateway L-GW1 (close to the user's gateway), and assigns an IP address to the user, when the user moves. When accessing the target base station from the source base station, the related art also needs to connect the target base station to the L-GW1 (the gateway close to the user). Since the geographic range that L-GW1 (the gateway close to the user) can cover is limited, and the geographical location of the user has moved, connecting the target base station to L-GW1 (close to the user's gateway) can easily lead to user routing. Not optimized, resulting in unnecessary network resource consumption and increased delay in user data transmission, affecting the user experience. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method and system for establishing a LIPA or SIPTO to solve the problem that a route is not optimized after a user moves to a different base station and still connects to a previous local gateway. According to an aspect of the present invention, a LIPA or SIPTO establishing method is provided, including: a user terminal switching from a source base station to a target base station; releasing LIPA or SIPTO between the user terminal via the target base station to the first local gateway, and establishing a user The terminal passes the target base station to the LIPA or SIPTO of the second local gateway. Preferably, before releasing the LIPA or SIPTO between the target terminal and the first local gateway, and establishing the LIPA or SIPTO of the user terminal to the second local gateway via the target base station, the method further includes: determining the target base station to the first The route between the local gateways does not meet the predetermined condition, and there is a second local gateway that meets the predetermined condition with the route between the target base station, where the predetermined condition includes: the current location of the user terminal under the target base station is in a predetermined area of the local gateway Within the scope. Preferably, determining that the route between the target base station and the first local gateway does not meet a predetermined condition, and that the second local gateway that meets the predetermined condition with the route between the target base station includes: a mobility tube Obtaining a current location of the user terminal; the mobility management entity determines that the current location of the user terminal is outside a predetermined geographical range of the first local gateway, and determines a second local gateway that meets the predetermined condition in the local gateway connected to the target base station; Alternatively, the target base station determines a second local gateway that meets the predetermined condition, and sends the IP address of the second local gateway to the mobility management entity, and the mobility management entity determines the IP address of the second local gateway and the IP address of the first local gateway. Differently, it is determined that the first local gateway does not meet the predetermined condition. Preferably, the acquiring, by the mobility management entity, the current location of the user terminal includes: moving the user terminal in the idle state to the area covered by the target base station, and determining that the current location tracking area carried in the air interface broadcast message from the target base station is not from the mobile In the tracking area list of the sexual management entity, the user terminal initiates a tracking area update request, and the target base station carries the current location information of the user terminal in the tracking area update request, and sends the current location information to the mobility management entity; or, the user terminal in the connected state Moving to the area covered by the target base station, performing interface X2 handover between the base stations, the target base station transmitting the current location of the user terminal to the mobility management entity; or, the user terminal in the connected state moves to the area covered by the target base station And performing an interface S 1 handover between the base station and the serving gateway, and the source base station sends the current location of the user terminal to the mobility management entity. Preferably, after the mobility management entity acquires the current location of the user terminal, the method further includes: sending, by the target base station, the information of the second local gateway to the mobility management entity, where the second local gateway is pre-configured by the target base station. Preferably, releasing LIPA or SIPTO between the user terminal and the first local gateway via the target base station, and establishing LIPA or SIPTO of the user terminal to the second local gateway via the target base station comprises: the mobility management entity initiates establishment to the second local gateway a session request, where the establishment session request carries an access point name of a PDN connection between the user terminal and the first local gateway; the second local gateway sends a setup session reply to the mobility management entity, where the establishment session reply carries the first The second local gateway allocates an IP address to the user terminal; the mobility management entity initiates a delete session request to the first local gateway. Preferably, determining that the route between the target base station and the first local gateway does not meet the predetermined condition comprises: the first local gateway receiving the current location of the user terminal from the mobility management entity, the first local gateway checking that the current location of the user terminal exceeds the first a predetermined address range of the local gateway; releasing the LIPA or SIPTO between the user terminal and the first local gateway via the target base station includes: after the first local gateway sends the delete bearer request to the mobility management entity, the mobility management entity sends the first local gateway to the first local gateway Sending a delete bearer reply, where the reason for deleting the bearer request is that the first local gateway cancels providing the UE with a monthly service, and instructs the UE to reconnect; and establishing the user terminal to the second local gateway via the target base station The LIPA or the SIPTO includes: the mobility management entity sends a setup session request to the second local gateway, and the second local gateway sends a setup session reply to the mobility management entity, where the setup session request carries the user terminal and the first local gateway The access point name of the PDN connection, and the establishment session reply carries the IP address assigned by the second local gateway to the user terminal. Preferably, releasing the LIPA between the user terminal via the target base station to the first local gateway or

SIPTO, 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO之后，上述方法还包括：将第二本地网关为用户终端分配的 IP地址下发给用户终端。优选地，将第二本地网关为用户终端分配的 IP地址下发给用户终端包括以下至少之一：移动性管理实体向用户终端发送携带有为用户终端分配的 IPv4地址的艮踪区更新（ Tracking Area Update, 简称为 TAU )接纳消息和 / 或非接入层消息，用户终端接受 IPv4地址；第一预定网关向用户终端发送携带有为用户终端分配的 IPv6地址前缀的路由广播，用户终端接受 IPv6地址前缀；第一预定网关通过动态主机设置协议版本 4 ( Dynamic Host Configuration Protocol version 4, 简称为 DHCPv4 )地址分配过程向用户终端发送 IPv4地址，用户终端接受 IPv4地址。根据本发明的另一方面，提供了一种 LIPA或 SIPTO建立***，包括：释放模块，用于在用户终端从源基站切换到目标基站的情况下，释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO; 建立模块，用于建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO。通过本发明，釆用在用户终端从源基站切换到目标基站的情况下，为用户终端建立经由目标基站到其他本地网关之间的 IP连接，解决了在用户在发生移动后，接入不同基站下仍然连接到先前的本地网关导致路由不优化的问题，减少了网络资源的消耗和用户数据传输的延迟，提高了用户体验。附图说明此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：图 1是根据相关技术的移动通信网络架构的示意图; 图 2是根据本发明实施例的 LIPA或 SIPTO建立方法的流程图；图 3是根据本发明实例 1的 LIPA或 SIPTO建立方法的详细流程图；图 4是根据本发明实例 2的 LIPA或 SIPTO建立方法的详细流程图；图 5是根据本发明实施例的 LIPA或 SIPTO建立***的结构框图。具体实施方式下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。本发明实施例提供了一种 LIPA或 SIPTO建立方法，图 2是根据本发明实施例的 LIPA或 SIPTO建立方法的流程图，如图 2所示，该方法包括：步 4聚 S202 , 用户终端从源基站切换到目标基站；步骤 S204, 释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO , 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO。通过上述方法，使得在用户终端发生移动并进行了基站切换后，将切换过程中被连接到第一本地网关的目标基站改为连接到第二本地网关，该第二本地网关不同于该用户终端在切换前连接的本地网关（即，第一本地网关），与现有技术中仍将目标基站连接到该用户终端在切换前连接的网关的方法有非常明显的区别，该方法解决了在用户在发生移动后，接入不同基站下仍然连接到先前的本地网关易导致路由不优化的问题。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或 SIPTO , 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO之前，确定目标基站到第一本地网关之间的路由不符合预定条件，并且存在与目标基站之间的路由符合预定条件的第二本地网关，其中，预定条件包括：目标基站下的用户终端的当前位置在本地网关的预定地域范围之内。通过上述的方法，保证了与目标基站连接的第二本地网关能够比原来的第一本地网关具有更加优化的路由，从而更好地为用户终端提供服务。需要说明的是，上述过程旨在确定第一本地网关与目标基站之间的路由不优化 (即，连接质量相对较差），以及确定与目标基站之间的路由较优化（比上述的第一本地网关与目标基站之间的路由更优化；)，在本实施例中是釆用判断是否满足预定条件的方式来确定，但在实际应用中，也可以釆用其他的方式，如，比较路由的跳数等方式来确定。优选地，确定目标基站到第一本地网关之间的路由不符合预定条件，并且存在与目标基站之间的路由符合预定条件的第二本地网关包括：移动性管理实体获取用户终端的当前位置；移动性管理实体确定用户终端的当前位置在第一本地网关的预定地域范围之外，并确定与目标基站连接的本地网关中符合预定条件的第二本地网关；或者，目标基站确定符合预定条件的第二本地网关，并将第二本地网关的 IP地址发送至移动性管理实体，移动性管理实体判断第二本地网关的 IP地址与第一本地网关的 IP地址不同，则确定第一本地网关不符合预定条件。移动性管理实体确定目标基站到第一本地网关之 After the SIPTO, and establishing the LIPA or SIPTO of the user terminal to the second local gateway, the method further includes: sending the IP address assigned by the second local gateway to the user terminal to the user terminal. Preferably, the IP address assigned by the second local gateway to the user terminal is delivered to the user terminal, including at least one of the following: the mobility management entity sends the user terminal a tracking area update carrying the IPv4 address allocated for the user terminal (Tracking) Area Update, abbreviated as TAU) Admission message and/or non-access stratum message, the user terminal accepts the IPv4 address; the first predetermined gateway sends a route broadcast carrying the IPv6 address prefix assigned to the user terminal to the user terminal, and the user terminal accepts the IPv6 address. Address prefix; The first predetermined gateway sends an IPv4 address to the user terminal through a Dynamic Host Configuration Protocol version 4 (DHCPv4) address allocation process, and the user terminal accepts the IPv4 address. According to another aspect of the present invention, a LIPA or SIPTO setup system is provided, including: a release module, configured to release a user terminal to a first local gateway via a target base station if a user terminal switches from a source base station to a target base station Between the LIPA or SIPTO; establishing module for establishing LIPA or SIPTO of the user terminal to the second local gateway via the target base station. According to the present invention, when the user terminal switches from the source base station to the target base station, the IP connection between the target base station and the other local gateways is established for the user terminal, and the access to the different base stations after the user moves occurs is solved. The problem of routing not being optimized is still connected to the previous local gateway, which reduces the consumption of network resources and the delay of user data transmission, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a mobile communication network architecture according to the related art; 2 is a flow chart of a LIPA or SIPTO establishment method according to an embodiment of the present invention; FIG. 3 is a detailed flowchart of a LIPA or SIPTO establishment method according to Example 1 of the present invention; FIG. 4 is a LIPA or SIPTO establishment according to Example 2 of the present invention. Detailed Flowchart of the Method; FIG. 5 is a structural block diagram of a LIPA or SIPTO setup system in accordance with an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The embodiment of the present invention provides a LIPA or SIPTO establishing method, and FIG. 2 is a flowchart of a LIPA or SIPTO establishing method according to an embodiment of the present invention. As shown in FIG. 2, the method includes: Step 4: S202, the user terminal The source base station switches to the target base station; step S204, releasing LIPA or SIPTO between the user terminal and the first local gateway via the target base station, and establishing LIPA or SIPTO of the user terminal to the second local gateway via the target base station. Through the above method, after the user terminal moves and performs the base station handover, the target base station connected to the first local gateway in the handover process is changed to be connected to the second local gateway, and the second local gateway is different from the user terminal. The local gateway (ie, the first local gateway) connected before the handover has a very obvious difference from the method in the prior art that the target base station is still connected to the gateway connected to the user terminal before the handover, and the method solves the problem in the user. After the mobile is moved, accessing the different local base stations and still connecting to the previous local gateway may cause the routing to be unoptimized. Preferably, releasing the LIPA or SIPTO between the target terminal and the first local gateway via the target base station, and establishing the LIPA or SIPTO of the user terminal to the second local gateway via the target base station, determining the target base station to the first local gateway The route does not meet the predetermined condition, and there is a second local gateway that meets the predetermined condition with the route between the target base station, wherein the predetermined condition includes: the current location of the user terminal under the target base station is within a predetermined geographical range of the local gateway. Through the above method, it is ensured that the second local gateway connected to the target base station can have a more optimized route than the original first local gateway, thereby better serving the user terminal. It should be noted that the foregoing process is to determine that the route between the first local gateway and the target base station is not optimized (ie, the connection quality is relatively poor), and that the route between the target base station and the target base station is optimized (than the above). The routing between the first local gateway and the target base station is more optimized; in the embodiment, it is determined by determining whether the predetermined condition is met, but in practical applications, other methods may also be used, such as , compare the number of hops of the route, etc. to determine. Preferably, determining that the route between the target base station and the first local gateway does not meet the predetermined condition, and that the second local gateway that meets the predetermined condition with the route between the target base station includes: the mobility management entity acquires the current location of the user terminal; The mobility management entity determines that the current location of the user terminal is outside a predetermined geographical range of the first local gateway, and determines a second local gateway that meets a predetermined condition among the local gateways connected to the target base station; or, the target base station determines that the predetermined condition is met a second local gateway, and sending an IP address of the second local gateway to the mobility management entity, where the mobility management entity determines that the IP address of the second local gateway is different from the IP address of the first local gateway, determining that the first local gateway is not Meet the predetermined conditions. The mobility management entity determines the target base station to the first local gateway

优选地，移动性管理实体获取用户终端的当前位置包括：处于空闲态的用户终端移动到目标基站覆盖的区域内，并判断来自目标基站的空中接口广播消息中携带的当前位置跟踪区不在来自移动性管理实体的跟踪区列表中，则用户终端发起跟踪区更新请求，目标基站在跟踪区更新请求中携带用户终端的当前位置信息，并发送至移动性管理实体；或者，处于连接态的用户终端移动到目标基站覆盖的区域内，进行跨基站之间的接口 X2切换，目标基站将用户终端的当前位置发送至移动性管理实体；或者，处于连接态的用户终端移动到目标基站覆盖的区域内，进行跨基站的与服务网关之间的接口 S 1 切换，源基站将用户终端的当前位置发送至移动性管理实体。在实际应用中，移动性管理实体也可以釆取不同于上述三种方式的其他方式获取用户终端的当前位置，本发明实施例对此不作限定。优选地，移动性管理实体获取用户终端的当前位置之后，目标基站第二本地网关的信息发送至移动性管理实体，其中，第二本地网关是由目标基站预先配置的。该实施例中，通过目标基站将自身中预先配置的具有较优化路由的第二本地网关的信息通知移动性管理实体，可以省略查找第二本地网关的过程，节省了***的资源。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或 SIPTO, 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO包括：移动性管理实体向第二本地网关发起建立会话请求，其中，建立会话请求携带有用户终端与第一本地网关之间的 PDN 连接的接入点名称；第二本地网关向移动性管理实体发送建立会话回复，其中，建立会话回复携带有第二本地网关为用户终端分配的 IP地址；移动性管理实体向第一本地网关发起删除会话请求。上述过程中，是在移动性管理实体确定第一本地网关不符合预定条件，并确定了存在符合预定条件的第二本地网关后，发起释放连接过程和连接建立过程。作为另外一种可选的实施方式，也可以由第一本地网关确定第一本地网关不符合预定条件，并通知移动性管理实体发起连接释放，再由移动性管理实体确定第二本地网关，进而进行新的连接建立，其具体过程如下：确定目标基站到第一本地网关之间的路由不符合预定条件包括：第一本地网关从移动性管理实体接收用户终端的当前位置，第一本地网关检查用户终端的当前位置超出第一本地网关的预定地址范围；释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO包括：第一本地网关向移动性管理实体发送删除承载请求后，移动性管理实体向第一本地网关发送删除 7 载回复，其中，删除 7 载请求的原因值为第一本地网关取消为 UE提供服务，并指示 UE重新连接；建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO包括：移动性管理实体向第二本地网关发送建立会话请求，第二本地网关向移动性管理实体发送建立会话回复，其中，建立会话请求携带有用户终端与第一本地网关之间的 PDN 连接的接入点名称，建立会话回复携带有第二本地网关为用户终端分配的 IP地址。优选地，释放用户终端经由目标基站到第一本地网关之间的 LIPA 或 SIPTO , 并建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO之后，将第二本地网关为用户终端分配的 IP地址下发给用户终端。上述将第二本地网关为用户终端分配的 IP 地址下发给用户终端的过程可以包括以下至少之一： Preferably, the acquiring, by the mobility management entity, the current location of the user terminal includes: moving the user terminal in the idle state to the area covered by the target base station, and determining that the current location tracking area carried in the air interface broadcast message from the target base station is not from the mobile In the tracking area list of the sexual management entity, the user terminal initiates a tracking area update request, and the target base station carries the current location information of the user terminal in the tracking area update request, and sends the current location information to the mobility management entity; or, the user terminal in the connected state Moving to the area covered by the target base station, performing interface X2 handover between the base stations, the target base station transmitting the current location of the user terminal to the mobility management entity; or, the user terminal in the connected state moves to the area covered by the target base station And performing an interface S 1 handover between the base station and the serving gateway, and the source base station sends the current location of the user terminal to the mobility management entity. In an actual application, the mobility management entity may also obtain the current location of the user terminal in other manners than the foregoing three manners, which is not limited by the embodiment of the present invention. Preferably, after the mobility management entity acquires the current location of the user terminal, the information of the second local gateway of the target base station is sent to the mobility management entity, where the second local gateway is pre-configured by the target base station. In this embodiment, by the target base station notifying the mobility management entity of the pre-configured information of the second local gateway with the optimized route in the host, the process of searching for the second local gateway may be omitted, and the resources of the system are saved. Preferably, releasing the LIPA between the user terminal via the target base station to the first local gateway or SIPTO, and establishing the LIPA or SIPTO of the user terminal to the second local gateway via the target base station comprises: the mobility management entity initiating a setup session request to the second local gateway, wherein the establishing the session request carries the user terminal and the first local gateway The access point name of the PDN connection; the second local gateway sends a setup session reply to the mobility management entity, where the establishment session reply carries the IP address assigned by the second local gateway to the user terminal; the mobility management entity is to the first local The gateway initiates a delete session request. In the above process, after the mobility management entity determines that the first local gateway does not meet the predetermined condition, and determines that there is a second local gateway that meets the predetermined condition, the release connection process and the connection establishment process are initiated. In another optional implementation manner, the first local gateway may determine that the first local gateway does not meet the predetermined condition, and notify the mobility management entity to initiate connection release, and then determine, by the mobility management entity, the second local gateway, where Performing a new connection establishment, the specific process is as follows: Determining that the route between the target base station and the first local gateway does not meet the predetermined condition includes: the first local gateway receives the current location of the user terminal from the mobility management entity, and the first local gateway checks The current location of the user terminal exceeds the predetermined address range of the first local gateway; releasing the LIPA or SIPTO between the user terminal and the first local gateway via the target base station includes: after the first local gateway sends the delete bearer request to the mobility management entity, The sex management entity sends a delete 7-load reply to the first local gateway, where the reason for deleting the 7-load request is that the first local gateway cancels the service for the UE, and indicates that the UE reconnects; and establishes the user terminal to the second local device via the target base station. The gateway's LIPA or SIPTO includes: Mobility Management Entity The second local gateway sends a setup session request, and the second local gateway sends a setup session reply to the mobility management entity, where the establishment session request carries the access point name of the PDN connection between the user terminal and the first local gateway, and establishes a session. The reply carries the IP address assigned by the second local gateway to the user terminal. Preferably, releasing the LIPA or SIPTO between the user terminal and the first local gateway via the target base station, and establishing the IP address allocated by the second local gateway to the user terminal after the LITP or SIPTO of the user terminal to the second local gateway via the target base station The address is sent to the user terminal. The process of sending the IP address assigned by the second local gateway to the user terminal to the user terminal may include at least one of the following:

( 1 ) 移动性管理实体向用户终端发送携带有为用户终端分配的 IPv4地址的 TAU接纳消息和 /或非接入层消息，用户终端接受 IPv4地址； ( 2 ) 第一预定网关向用户终端发送携带有为用户终端分配的 IPv6地址前缀的路由广播，用户终端接受 IPv6地址前缀； (1) The mobility management entity sends a TAU admission message and/or a non-access stratum message carrying the IPv4 address assigned to the user terminal to the user terminal, and the user terminal accepts the IPv4 address; (2) the first predetermined gateway sends a route broadcast carrying the IPv6 address prefix allocated to the user terminal to the user terminal, and the user terminal accepts the IPv6 address prefix;

( 3 )第一预定网关通过 DHCPv4地址分配过程向用户终端发送 IPv4地址，用户终端接受 IPv4地址。需要说明的是，上述源基站可以包括：家庭基站或无线网络控制器（ Radio(3) The first predetermined gateway sends an IPv4 address to the user terminal through the DHCPv4 address allocation process, and the user terminal accepts the IPv4 address. It should be noted that the foregoing source base station may include: a home base station or a radio network controller (Radio

Network Controller, 简称为 RNC ), 目标基站可以包括：家庭基站或 RNC; 第一本地网关可以包括：本地接入网关、本地月艮务网关、核心网接入网关或核心网月艮务网关，第二本地网关可以包括：本地接入网关、本地月艮务网关、核心网接入网关或核心网月艮务网关；移动性管理实体为：移动管理单元 ( Mobility Management Entity , 简称为 ΜΜΕ )、移动交换中心（Mobile Switching Centre,简称为 MSC )、或月艮务通用无线分组业务支持节点（ Serving GPRS Support Node , 简称为 SGSN ), 其中，本地接入网关可以是 L-PGW、 L-GGSN, 本地服务网关可以是 L-SGW、 L-SGSN。核心网接入网关可以是 P-GW、 GGSN, 核心网服务网关可以是 S-GW、 SGSN。另夕卜，本地 IP访问的基站可以与本地接入网关地址相同。下面结合附图通过具体实例对本发明实施例提供的方法作进一步的详细描述。以下实例中的 L-GW可以是运营商网络中靠近用户位置的网关，家庭基站上集成的网关，或者非运营商网络（如企业自有网络）中的网关。实例 1 该实例以移动性管理实体为 MME为例进行详细说明，图 3为根据本发明实例 1的 LIPA或 SIPTO建立方法的详细流程图，如图 3所示，该方法包括以下步 4聚：步骤 301 : UE通过基站子***（即，基站，记为（H ) eNBl )连接到网络（网关为 L-GW1或者 PGW1 ) 并进行本地 IP访问；步 4聚 302: UE移动到（ H ) eNB2覆盖下， MME获取到 UE的当前位置。具体获取位置的方式可以是如下三种方式之一：步骤 302a: UE移动到 ( H ) eNB2覆盖下，当 UE处于空闲态时， UE 从基站发来的空中接口广播消息中监测到当前所处的位置跟踪区（ Tracking Area, 简称为 TA ) 不在步 4聚 301中 MME发来的 TA List ( TA列表）， UE发起艮踪区更新请求 ( Tracking Area Update Request, 简称为 TAU Request ), 其中在转发 TAU消息时，（ H ) eNB2在 TAU消息中增加用户当前的位置信息，如 CGI (小区号） /TAI等，并发给 MME; 可选地，在转发 TAU消息时，（ H ) eNB2可以将自己配置的具有优化路由的网关 L-GW2/P-GW2的 IP地址发给 MME。步骤 302b: UE移动到（H ) eNB2覆盖下，当 UE处于连接态时，发生切换，如果发生的是跨基站之间的接口 X2切换，此时由目标基站子*** ( ( H ) eNB2 ) 将用户当前所处的位置通知 MME; 可选地，（ H ) eNB2 可以将自己配置的具有优化路由的网关 L-GW2/P-GW2的 IP地址发给 MME。步骤 302c： UE移动到（ H ) eNB2覆盖下，当 UE处于连接态时，发生切换，如果发生的是跨基站的与 S-GW之间的接口 S 1切换，此时由源基站子*** （（H ) eNBl ) 将用户当前所处的位置通知 MME; 可选地，（ H ) eNB2 可以将自己配置的具有优化路由的网关 L-GW2/P-GW2的 IP地址发给 MME。除了上述三种情况以外， MME还可以在 UE发起的业务请求过程中获取到用户的位置信息，在此不再赞述。在上述步骤 202中， UE移动到（H ) eNB2覆盖下后，会从（H ) eNBl 切换到（H ) eNB2, 此时，按照现有技术中的流程，会建立 UE通过（H ) eNB2与 L-GW 1或者 PGW 1之间的连接。步骤 303 : MME根据从步骤 302中获取到的 UE当前连接的基站位置信息，查找到该基站（或该位置）连接到的路由优化的 L-GW2/P-GW2, 判断 UE当前连接 (具体为 UE当前通过（ H ) eNB2连接）的网关 L-GW1/P-GW1 不是路由优化的网关；或者根据 ( H ) eNB2发来的网关 L-GW2/P-GW2的 IP 地址以及 UE当前连接的网关 L-GW1/P-GW1的 IP地址不同，判断 UE当前连接的网关不是路由优化的网关；根据上述判断， MME向网关 L-GW2/P-GW2发起建立会话请求，其中携带 UE先前连接到网关 L-GW1/P-GW1的 PDN连接的接入点名称（ AccessThe network controller (referred to as RNC for short), the target base station may include: a home base station or an RNC; the first local gateway may include: a local access gateway, a local monthly service gateway, a core network access gateway, or a core network service gateway, The second local gateway may include: a local access gateway, a local monthly service gateway, a core network access gateway, or a core network service gateway; the mobility management entity is: a Mobility Management Entity (abbreviated as ΜΜΕ), mobile The Switching Centre (Mobile Switching Centre, MSC for short), or the Serving GPRS Support Node (SGSN), where the local access gateway can be L-PGW, L-GGSN, local The serving gateway may be an L-SGW or an L-SGSN. The core network access gateway may be a P-GW or a GGSN, and the core network serving gateway may be an S-GW or an SGSN. In addition, the base station accessed by the local IP may be the same as the address of the local access gateway. The method provided by the embodiment of the present invention is further described in detail below by way of specific examples with reference to the accompanying drawings. The L-GW in the following example may be a gateway in the operator network close to the user's location, an integrated gateway on the home base station, or a gateway in a non-operator network (such as an enterprise-owned network). Example 1 This example uses a mobility management entity as an MME as an example for detailed description. FIG. 3 is a detailed flowchart of a LIPA or SIPTO establishment method according to the first embodiment of the present invention. As shown in FIG. 3, the method includes the following steps: Step 301: The UE connects to the network (the gateway is L-GW1 or PGW1) through the base station subsystem (ie, the base station, denoted as (H) eNB1) and performs local IP access; Step 4: 302: The UE moves to (H) eNB2 Under the coverage, the MME obtains the current location of the UE. The manner of obtaining the location may be one of the following three ways: Step 302a: The UE moves to (H) the coverage of the eNB2, and when the UE is in the idle state, the UE monitors the current location in the air interface broadcast message sent by the base station. The Tracking Area (TA) is not in the TA List sent by the MME in Step 4, and the UE sends the TA List. The Tracking Area Update Request (TAU Request), where the TAU message is forwarded, the (H) eNB2 adds the current location information of the user, such as CGI (Cell No.)/TAI, to the TAU message. The MME may be sent to the MME. The IP address of the gateway L-GW2/P-GW2 with the optimized route configured by the eNB may be sent to the MME. Step 302b: The UE moves to (H) eNB2 coverage. When the UE is in the connected state, a handover occurs. If an X2 handover occurs between the interfaces between the base stations, the target base station subsystem ((H) eNB2) The MME is notified of the location where the user is currently located; optionally, the (H) eNB2 may send the IP address of the gateway L-GW2/P-GW2 with the optimized route configured by itself to the MME. Step 302c: The UE moves to (H) eNB2 coverage. When the UE is in the connected state, a handover occurs. If a handover occurs between the S-GW and the S-GW, the source base station subsystem ( (H) eNB1) informs the MME of the location where the user is currently located; optionally, (H) eNB2 may send the IP address of the gateway L-GW2/P-GW2 with the optimized route configured by itself to the MME. In addition to the above three cases, the MME may also obtain the location information of the user in the service request process initiated by the UE, and the description is not repeated herein. In the foregoing step 202, after the UE moves to (H) eNB2 to cover, it will switch from (H) eNB1 to (H) eNB2. At this time, according to the flow in the prior art, the UE is established to pass (H) eNB2 and The connection between L-GW 1 or PGW 1. Step 303: The MME searches for the route-optimized L-GW2/P-GW2 to which the base station (or the location) is connected according to the base station location information currently connected by the UE obtained in step 302, and determines that the UE is currently connected (specifically The gateway L-GW1/P-GW1 that the UE currently connects through (H) eNB2 is not a route optimized gateway; or according to (H) the IP address of the gateway L-GW2/P-GW2 sent by the eNB2 and the gateway currently connected by the UE The IP address of the L-GW1/P-GW1 is different, and it is determined that the gateway currently connected by the UE is not a route optimized gateway; according to the above judgment, the MME initiates a setup session request to the gateway L-GW2/P-GW2, where the carrying UE is previously connected to the gateway. Access point name of the PDN connection of L-GW1/P-GW1 (Access

Point Name, 简称为 APN ), 请求建立一个到上述 APN的 PDN连接；步骤 304: 网关 L-GW2/P-GW2向 MME发送建立会话回复，其中携带为该 UE分配的新 IP地址，即， IPv4地址和 /或 IPv6地址前缀；步骤 305 : MME发起删除会话请求，将已经连接的该 UE经由（ H ) eNB2 到网关 L-GW1/P-GW1的连接会话删除；步 4聚 306: 将 L-GW2/P-GW2为该 UE分配的新的 IP地址通知该 UE, 具体的，可以釆取以下方式至少之一进行通知：步骤 306a: 该步骤可以是 MME完成 UE的 TAU过程，发送 TAU接纳消息给 UE, 其中包含为该 UE分配的新 IPv4地址， UE接受该地址；还可以是 MME发给 UE的其他 NAS (非接入层）消息，消息中包含为该 UE分配的新 IPv4地址， UE接受该地址；步 4聚 306b : 网关 L-GW1/P-GW1 向 UE 发送路由广播 ( ROUTER ADVERTISEMENT )，其中包含为该 UE分配的新 IPv6地址前缀， UE接受该地址前缀；步骤 306c: 网关 L-GW1/P-GW1可以通过 DHCPv4地址分配过程，将新的 IPv4地址发给 UE, UE接受该地址。实例 2 图 4为才艮据本发明实例 2的 LIPA或 SIPTO建立方法的详细流程图，如图 4所示，具体包括以下步 4聚：步骤 401 , UE在（ H ) eNBl覆盖下，向 MME发起附着请求或 PDN连接建立请求；步骤 402, MME执行网关选择，并向选择的网关 L-GW1/P-GW1发送建立会话请求，以请求网关为该 UE建立 PDN连接；步骤 403 , 网关向 MME发送建立会话回复，其中携带移动台信息改变 4艮告动作（开始）（ MS Info Change Reporting Action ( Start ) ), 用于指示 MME 当 UE的位置发生改变时需要上 4艮 UE的最新位置；步骤 404, MME向 UE发送附着接纳或 PDN连接建立接纳；步骤 405 , 与步骤 302相同；步骤 406, MME根据步骤 403中收到的移动台信息改变报告动作（开始；)，向网关 L-GW1/P-GW1报告 UE的最新位置 CGI/TAI, 该 4艮告可以是在其他流程的需要 MME发给网关的信令中，或者是一个专门的用于报告 UE的最新位置的报告信令消息；步骤 407, 根据步骤 406中收到的 UE最新位置（ CGI/TAI ), 网关检查自身保存的可以服务的具有优化路由的区域范围，发现该位置不在上述区域内，决定不再为该 UE提供服务，向 MME发送删除承载请求，其中携带原因值为不再为该 UE提供服务且指示 UE重新连接；步骤 408 , MME向网关 L-GW1/P-GW1发送删除载回复；步 4聚 409, MME重新为 UE的上述 PDN连接执行 PDN GW选择，查找到网关 L-GW2/P-GW2可以为该 UE提供连接到上述 PDN的月艮务，向网关 L-GW2/P-GW2发送建立会话请求，其中携带上述 PDN对应的 APN; 步骤 410, 网关 L-GW2/P-GW2向 MME回复建立会话回复，其中包含为该 UE分配的新的 IP地址，该地址可以为 IPv4地址和 /或 IPv6地址前缀；步 4聚 411 , 将 L-GW2/P-GW2为该 UE分配的新的 IP地址通 ^口该 UE, 具体的，可以釆取步骤 306a、 306b和 306c中的至少之一进行通知。以上实施例以当前 E-UTRAN***不存在家庭基站网关的情况为例进行说明，但是，上述方法也适用于存在家庭基站网关的情况，此时可以把家庭基站和家庭基站网关统一作为基站或基站子***；此外该方法也适用于 UTRAN/GERAN的家庭基站子***以及基站子***为宏基站场景，此时移动性管理实体为 SGSN, 在此不再赘述。以上实例 1和实例 2中，网络在监测到用户移动到目标基站，并且该目标基站与先前连接的网关之间的路由不优化的情况下，释放先前连接的网关与用户之间的 LIPA或 SIPTO,并建立用户与路由优化的网关之间的 LIPA或 SIPTO, 之后新连接的网关为用户分配新的 IP地址，网络侧将该 IP地址通知给用户，用户接受该 IP地址并利用该 IP地址进行本地 IP访问。本发明实施例还提供了一种 LIPA或 SIPTO建立***，图 5是根据本发明实施例的 LIPA或 SIPTO建立***的结构框图，如图 5所示，该***包括：释放模块 52 , 用于在用户终端从源基站切换到目标基站的情况下，释放用户终端经由目标基站到第一本地网关之间的 LIPA或 SIPTO; 建立模块 54, 用于建立用户终端经由目标基站到第二本地网关的 LIPA或 SIPTO。显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的 ^"神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 Point Name (referred to as APN), requesting to establish a PDN connection to the above APN; Step 304: The gateway L-GW2/P-GW2 sends a setup session reply to the MME, where the new IP address assigned to the UE, that is, the IPv4 address and/or the IPv6 address prefix is carried. Step 305: The MME initiates a delete session request, and The UE that has been connected is deleted via the connection session of (H) eNB2 to the gateway L-GW1/P-GW1; Step 4: 306: Notifying the UE of the new IP address allocated by the L-GW2/P-GW2 for the UE, Specifically, the notification may be performed by using at least one of the following manners: Step 306a: The step may be that the MME completes the TAU procedure of the UE, and sends a TAU admission message to the UE, where the UE includes a new IPv4 address allocated for the UE, and the UE accepts the address. And may be another NAS (non-access stratum) message sent by the MME to the UE, where the message includes a new IPv4 address allocated for the UE, and the UE accepts the address; Step 4: 306b: Gateway L-GW1/P-GW1 Direction The UE sends a route broadcast (ROUTER ADVERTISEMENT), which includes a new IPv6 address prefix assigned to the UE, and the UE accepts the address prefix; Step 306c: The gateway L-GW1/P-GW1 can process the new IPv4 address through the DHCPv4 address allocation process. Send to the UE, the UE accepts the address. Example 2 FIG. 4 is a detailed flowchart of a method for establishing a LIPA or a SIPTO according to the second embodiment of the present invention. As shown in FIG. 4, the method includes the following steps: Step 401: The UE is covered by (H) eNB1 to the MME. Initiating an attach request or a PDN connection setup request; Step 402, the MME performs gateway selection, and sends a setup session request to the selected gateway L-GW1/P-GW1 to request the gateway to establish a PDN connection for the UE; Step 403, the gateway to the MME Sending a session reply, where the MS Info Change Reporting Action (Start) is used to indicate that the MME needs the latest location of the UE when the location of the UE changes; 404. The MME sends an attach admission or a PDN connection setup and admission to the UE. Step 405 is the same as step 302. Step 406: The MME changes the reporting action (starting;) according to the mobile station information received in step 403, and reports the latest location CGI/TAI of the UE to the gateway L-GW1/P-GW1, which may be in other processes. The signaling sent by the MME to the gateway is required, or a special report signaling message for reporting the latest location of the UE; Step 407, according to the latest location of the UE (CGI/TAI) received in step 406, the gateway checks itself. The saved area of the serviced area with the optimized route is found to be in the area, and it is determined that the UE is no longer served. The MME sends a delete bearer request, where the carrying cause value is no longer serving the UE and indicating The UE reconnects; Step 408, the MME sends a delete bearer reply to the gateway L-GW1/P-GW1; Step 4 gathers 409, and the MME re-selects the PDN GW for the PDN connection of the UE, and finds the gateway L-GW2/P-GW2 The UE may be configured to provide a connection request to the PDN, and send a setup session request to the gateway L-GW2/P-GW2, where the APN corresponding to the PDN is carried; Step 410, the gateway L-GW2/P-GW2 replies to the MME. Establish a session reply, which is included for the UE A new IP address, the address may be an IPv4 address and/or an IPv6 address prefix; step 4 is 411, and the new IP address assigned by the L-GW2/P-GW2 to the UE is passed to the UE, specific At least one of steps 306a, 306b, and 306c may be retrieved for notification. The above embodiment is described by taking the case where the current E-UTRAN system does not have a home base station gateway. However, the above method is also applicable to the case where there is a home base station gateway. In this case, the home base station and the home base station gateway can be unified as a base station or a base station. The method is also applicable to the eNB of the UTRAN/GERAN, and the base station subsystem is the macro eNB. The mobility management entity is the SGSN, and details are not described herein. In the above examples 1 and 2, the network releases the LIPA or SIPTO between the previously connected gateway and the user in the case that the user is monitored to move to the target base station, and the route between the target base station and the previously connected gateway is not optimized. And establishing a LIPA or SIPTO between the user and the route optimized gateway, and then the newly connected gateway allocates a new IP address to the user, and the network side notifies the user of the IP address, and the user accepts the IP address and uses the IP address to perform the IP address. Local IP access. The embodiment of the present invention further provides a LIPA or SIPTO establishing system. FIG. 5 is a structural block diagram of a LIPA or SIPTO establishing system according to an embodiment of the present invention. As shown in FIG. 5, the system includes: a releasing module 52, configured to When the user terminal switches from the source base station to the target base station, the user is released. The LIPA or SIPTO of the terminal via the target base station to the first local gateway; the establishing module 54 is configured to establish LIPA or SIPTO of the user terminal to the second local gateway via the target base station. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

权利要求书 Claims

1. 一种本地互联网协议连接 LIPA或选择的互联网协议流量分流 SIPTO建立方法，其特征在于，包括： 1. A local Internet protocol connection LIPA or selected Internet Protocol traffic offload SIPTO establishment method, which includes:

用户终端从源基站切换到目标基站； The user terminal switches from the source base station to the target base station;

释放所述用户终端经由所述目标基站到第一本地网关之间的 LIPA 或 SIPTO , 并建立所述用户终端经由所述目标基站到第二本地网关的 LIPA或 SIPTO。 Release LIPA or SIPTO between the user terminal and the first local gateway via the target base station, and establish LIPA or SIPTO of the user terminal to the second local gateway via the target base station.

2. 根据权利要求 1所述的方法，其特征在于，释放所述用户终端经由所述目标基站到第一本地网关之间的 LIPA或 SIPTO, 并建立所述用户终端经由所述目标基站到第二本地网关的 LIPA或 SIPTO之前，所述方法还包括： 2. The method according to claim 1, wherein the user terminal is released via the target base station to the LIPA or SIPTO between the first local gateway, and the user terminal is established via the target base station to the first Before the LIPA or SIPTO of the second local gateway, the method further includes:

确定所述目标基站到所述第一本地网关之间的路由不符合预定条件，并且存在与所述目标基站之间的路由符合所述预定条件的第二本地网关，其中，所述预定条件包括：所述目标基站下的所述用户终端的当前位置在本地网关的预定地域范围之内。 Determining that the route between the target base station and the first local gateway does not meet a predetermined condition, and that there is a second local gateway that meets the predetermined condition with a route between the target base station, where the predetermined condition includes The current location of the user terminal under the target base station is within a predetermined geographical range of the local gateway.

3. 根据权利要求 2所述的方法，其特征在于，确定所述目标基站到所述第一本地网关之间的路由不符合预定条件，并且存在与所述目标基站之间的路由符合所述预定条件的第二本地网关包括： The method according to claim 2, wherein determining that a route between the target base station and the first local gateway does not meet a predetermined condition, and that a route between the target base station and the target base station is consistent with the method The second local gateway of the predetermined condition includes:

移动性管理实体获取所述用户终端的当前位置； The mobility management entity acquires a current location of the user terminal;

所述移动性管理实体确定所述用户终端的当前位置在所述第一本地网关的预定地域范围之外，并确定与所述目标基站连接的本地网关中符合所述预定条件的所述第二本地网关；或者，所述目标基站确定符合所述预定条件的所述第二本地网关，并将所述第二本地网关的 IP地址发送至所述移动性管理实体，所述移动性管理实体判断所述第二本地网关的 IP地址与所述第一本地网关的 IP地址不同，则确定所述第一本地网关不符合所述预定条件。 Determining, by the mobility management entity, that a current location of the user terminal is outside a predetermined geographical range of the first local gateway, and determining, in the local gateway connected to the target base station, the second that meets the predetermined condition a local gateway; or, the target base station determines the second local gateway that meets the predetermined condition, and sends an IP address of the second local gateway to the mobility management entity, where the mobility management entity determines The IP address of the second local gateway is different from the IP address of the first local gateway, and it is determined that the first local gateway does not meet the predetermined condition.

4. 根据权利要求 3所述的方法，其特征在于，所述移动性管理实体获取所述用户终端的当前位置包括：处于空闲态的所述用户终端移动到所述目标基站覆盖的区域内，并判断来自所述目标基站的空中接口广播消息中携带的当前位置跟踪区不在来自所述移动性管理实体的跟踪区列表中，则所述用户终端发起跟踪区更新请求，所述目标基站在所述跟踪区更新请求中携带所述用户终端的当前位置信息，并发送至所述移动性管理实体；或者， The method according to claim 3, wherein the obtaining, by the mobility management entity, the current location of the user terminal comprises: The user terminal in an idle state moves to an area covered by the target base station, and determines that a current location tracking area carried in an air interface broadcast message from the target base station is not in a tracking area list from the mobility management entity. The user terminal initiates a tracking area update request, and the target base station carries the current location information of the user terminal in the tracking area update request, and sends the current location information to the mobility management entity; or

处于连接态的所述用户终端移动到所述目标基站覆盖的区域内，进行跨基站之间的接口 X2 切换，所述目标基站将所述用户终端的当前位置发送至所述移动性管理实体；或者， The user terminal in the connected state moves to the area covered by the target base station, performs an interface X2 handover between the base stations, and the target base station sends the current location of the user terminal to the mobility management entity; Or,

处于连接态的所述用户终端移动到所述目标基站覆盖的区域内，进行跨基站的与服务网关之间的接口 S 1切换，所述源基站将所述用户终端的当前位置发送至所述移动性管理实体。根据权利要求 3所述的方法，其特征在于，所述移动性管理实体获取所述用户终端的当前位置之后，所述方法还包括： The user terminal in the connected state moves to an area covered by the target base station, performs an interface S1 handover with the serving gateway across the base station, and the source base station sends the current location of the user terminal to the Mobility management entity. The method according to claim 3, wherein after the mobility management entity acquires the current location of the user terminal, the method further includes:

所述目标基站所述第二本地网关的信息发送至所述移动性管理实体，其中，所述第二本地网关是由所述目标基站预先配置的。根据权利要求 1所述的方法，其特征在于，释放所述用户终端经由所述目标基站到第一本地网关之间的 LIPA或 SIPTO, 并建立所述用户终端经由所述目标基站到第二本地网关的 LIPA或 SIPTO包括： The information of the second local gateway of the target base station is sent to the mobility management entity, where the second local gateway is pre-configured by the target base station. The method according to claim 1, wherein the user terminal is released via the target base station to the LIPA or SIPTO between the first local gateway, and the user terminal is established to the second local via the target base station. The gateway's LIPA or SIPTO includes:

所述移动性管理实体向所述第二本地网关发起建立会话请求，其中，所述建立会话请求携带有所述用户终端与所述第一本地网关之间的 PDN连接的接入点名称； The mobility management entity initiates a setup session request to the second local gateway, where the setup session request carries an access point name of a PDN connection between the user terminal and the first local gateway;

所述第二本地网关向所述移动性管理实体发送建立会话回复，其中，所述建立会话回复携带有所述第二本地网关为所述用户终端分配的 IP 地址； The second local gateway sends a setup session reply to the mobility management entity, where the setup session reply carries an IP address assigned by the second local gateway to the user terminal;

所述移动性管理实体向所述第一本地网关发起删除会话请求。根据权利要求 2所述的方法，其特征在于， The mobility management entity initiates a delete session request to the first local gateway. The method of claim 2, wherein

确定所述目标基站到第一本地网关之间的路由不符合预定条件包括：所述第一本地网关从移动性管理实体接收所述用户终端的当前位置，所述第一本地网关检查所述用户终端的所述当前位置超出所述第一本地网关的预定地址范围；释放所述用户终端经由所述目标基站到所述第一本地网关之间的 LIPA或 SIPTO 包括：所述第一本地网关向所述移动性管理实体发送删除承载请求后，所述移动性管理实体向所述第一本地网关发送删除承载回复，其中，所述删除承载请求的原因值为所述第一本地网关取消为所述用户终端提供月艮务，并指示所述用户终端重新连接； Determining that the route between the target base station and the first local gateway does not meet the predetermined condition includes: the first local gateway receives a current location of the user terminal from a mobility management entity, and the first local gateway checks the user The current location of the terminal exceeds a predetermined address range of the first local gateway; Releasing the LIPA or SIPTO between the user terminal and the first local gateway via the target base station includes: after the first local gateway sends a delete bearer request to the mobility management entity, the mobility management entity Sending a deletion bearer reply to the first local gateway, where the reason for deleting the bearer request is that the first local gateway cancels providing the user terminal with a monthly service, and instructing the user terminal to reconnect;

建立所述用户终端经由所述目标基站到所述第二本地网关的 LIPA 或 SIPTO包括：所述移动性管理实体向所述第二本地网关发送建立会话请求，所述第二本地网关向所述移动性管理实体发送建立会话回复，其中，所述建立会话请求携带有所述用户终端与所述第一本地网关之间的分组数据网络 PDN连接的接入点名称，所述建立会话回复携带有所述第二本地网关为所述用户终端分配的 IP地址。 Establishing LIPA or SIPTO of the user terminal to the second local gateway via the target base station includes: the mobility management entity sending a setup session request to the second local gateway, where the second local gateway is The mobility management entity sends a setup session reply, where the setup session request carries an access point name of a packet data network PDN connection between the user terminal and the first local gateway, where the establishment session reply carries The second local gateway is an IP address allocated by the user terminal.

8. 根据权利要求 1所述的方法，其特征在于，释放所述用户终端经由所述目标基站到第一本地网关之间的 LIPA或 SIPTO, 并建立所述用户终端经由所述目标基站到第二本地网关的 LIPA或 SIPTO之后，所述方法还包括： The method according to claim 1, wherein the user terminal is released via the target base station to the LIPA or SIPTO between the first local gateway, and the user terminal is established via the target base station to the first After the LIPA or SIPTO of the second local gateway, the method further includes:

将所述第二本地网关为所述用户终端分配的 IP 地址下发给所述用户终端。 The IP address assigned by the second local gateway to the user terminal is delivered to the user terminal.

9. 才艮据权利要求 8所述的方法，其特征在于，将所述第二本地网关为所述用户终端分配的 IP地址下发给所述用户终端包括以下至少之一： The method according to claim 8, wherein the sending the IP address assigned by the second local gateway to the user terminal to the user terminal comprises at least one of the following:

所述移动性管理实体向所述用户终端发送携带有为所述用户终端分配的 IPv4地址的跟踪区更新 TAU接纳消息和 /或非接入层消息，所述用户终端接受所述 IPv4地址； The mobility management entity sends, to the user terminal, a tracking area update TAU admission message and/or a non-access stratum message carrying an IPv4 address assigned to the user terminal, where the user terminal accepts the IPv4 address;

所述第一预定网关向所述用户终端发送携带有为所述用户终端分配的 IPv6地址前缀的路由广播，所述用户终端接受所述 IPv6地址前缀；所述第一预定网关通过 DHCPv4地址分配过程向所述用户终端发送 IPv4地址，所述用户终端接受所述 IPv4地址。 The first predetermined gateway sends a route broadcast carrying an IPv6 address prefix allocated to the user terminal to the user terminal, where the user terminal accepts the IPv6 address prefix; and the first predetermined gateway passes the DHCPv4 address allocation process. Sending an IPv4 address to the user terminal, the user terminal accepting the IPv4 address.

10. —种本地互联网协议连接 LIPA或选择的互联网协议流量分流 SIPTO建立***，其特征在于，包括： 10. A local Internet Protocol connection LIPA or selected Internet Protocol traffic offload SIPTO build system, which is characterized by:

释放模块，用于在用户终端从源基站切换到目标基站的情况下，释放所述用户终端经由所述目标基站到所述第一本地网关之间的 LIPA 或 SIPTO; 建立模块，用于建立所述用户终端经由所述目标基站到所述第二本地网关的 LIPA或 SIPTO。 a release module, configured to release LIPA or SIPTO between the user terminal and the first local gateway via the target base station if the user terminal switches from the source base station to the target base station; And a establishing module, configured to establish LIPA or SIPTO of the user terminal to the second local gateway via the target base station.