WO2011060745A1 - 删除终端上下文的方法以及终端进行切换的系统 - Google Patents

删除终端上下文的方法以及终端进行切换的系统 Download PDF

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Publication number
WO2011060745A1
WO2011060745A1 PCT/CN2010/078994 CN2010078994W WO2011060745A1 WO 2011060745 A1 WO2011060745 A1 WO 2011060745A1 CN 2010078994 W CN2010078994 W CN 2010078994W WO 2011060745 A1 WO2011060745 A1 WO 2011060745A1
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Prior art keywords
base station
message
service network
target base
access service
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PCT/CN2010/078994
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English (en)
French (fr)
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李莉
李玲
王学寰
王兆明
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华为技术有限公司
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Publication of WO2011060745A1 publication Critical patent/WO2011060745A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a method for deleting a terminal context and a system for a terminal to perform handover. Background technique
  • WiMAX WiMAX (Wor ldwide Interoperabi l ty for Microwave Acces s), the full name of the Chinese is the global microwave access interoperability, is a wireless metropolitan area network technology based on the IEEE 802.16 standard.
  • the WiMAX network is mainly composed of three parts, namely, a terminal (MS), and an access service network (ASN) including a base station (BS) and an access service network gateway (ASN-GW), and a connection service network (CSN).
  • the WiMAX system generally adopts a hard handover method during the handover process. To avoid data loss during the handover process, the WiMAX Forum introduces a data integrity solution in the NWG 1.5 system.
  • Whether to adopt a data integrity scheme and which data integrity scheme to adopt is granular in traffic flow. That is, through the negotiation between the entities, the data integrity scheme can be adopted only for one or some service flows of the terminal, or the data integrity scheme is not adopted for all the service flows.
  • An implementation of the data integrity scheme is in the target access service network.
  • T-ASN and anchor access service gateway (Anchor ASN-GW), anchor access service gateway (Anchor ASN-GW) and service access service network (S-ASN) establish a slave base station (S -BS) to the target base station
  • the data return channel of the (T-BS) transmits the data buffered in the S-BS during the handover process to the T-BS through the backhaul channel, thereby ensuring the data integrity sent to the terminal.
  • FIG. 1 is a schematic diagram of a prior art data backhaul, wherein
  • Pa thO is: The general data channel between the serving ASN and the anchoring ASN-GW when no handover occurs.
  • Pa thl is: a backhaul data channel between the target ASN and the anchor ASN-GW for switching data back.
  • Pa th2 is: a backhaul data channel between the service ASN and the anchor ASN-GW for switching data backhaul.
  • Pa th3 is: a general data channel between the target ASN and the anchor ASN-GW after the handover is completed.
  • FIG. 2 is a flowchart of a handover process for ensuring data integrity by using a data backhaul mode. The specific process is as follows: Step 1: The MS initiates a M0B_MSH0_REQ handover request message to the serving base station.
  • Step 2 The serving base station initiates a H0-REQ handover request message to one or more target base stations.
  • Step4 (Optional) Anchor the ASN-GW to send a pre-registration message to the serving base station for Data Channel 2 (for data backhaul in handover).
  • Step 5 The target base station sends a H0_RSP handover reply message to the serving base station.
  • Step 6 The serving base station sends a M0B_BSH0_RSP handover reply message to the MS.
  • Step 7 The serving base station sends a H0_ACK handover confirmation message to the target base station.
  • Step 8 The MS sends a M0B_H0_IND message to the serving base station, and enters the handover execution phase.
  • Step 9 The serving base station sends a H0_Cnf message to the selected target base station.
  • the serving base station sends a H0_Cnf message to the unselected target base station, where the cance l handover cancellation indication is carried.
  • Stepl O The target base station sends a H0_ACK handover confirmation message to the serving base station. If data channels 1 and 2 are pre-registered, the serving base station can begin data backhaul to the target base station.
  • Stepl l (Optional) If Step 3 is not executed, the target base station sends pre-registration of data channel 1 (for general data transfer) and data channel 1 (for data return in handover) to the anchor ASN-GW. Message.
  • Stepl 2 (Optional) If Step 4 is not executed, the ASN-GW is anchored to the serving base station to send a pre-registration message for Data Channel 2 (for data backhaul in handover).
  • Stepl 3 The MS enters the network at the selected target base station. After successfully accessing the network, the target base station starts to send the data buffered in the Da ta Integrity Buffer (Data Integrity Buffer) to the MS.
  • Da ta Integrity Buffer Data Integrity Buffer
  • Stepl4 The target base station initiates the registration process of the data channel 3 (general data channel) to the anchor ASN-GW.
  • Stepl 5 (Optional) If Step3 or S tepl l is not executed, the target base station sends data channel 1 (for general data transfer) and data channel 1 to the anchor ASN-GW (for data backhaul in handover) ) Pre-registration message.
  • Stepl6 (Optional) If Step4 or Stepl2 is not executed, the ASN-GW is anchored to the serving base station to send a pre-registration message for Data Channel 2 (for data backhaul in handover).
  • Stepl7 The target base station sends a H0_Complete message to the serving base station to inform the serving base station that the MS has successfully entered the network at the target base station.
  • Stepl8 When the target base station judges that the data backhaul ends, the de-registration message of the data channel 1 is sent to the anchor ASN-GW.
  • Stepl9 After receiving the deregistration message of data channel 1, the anchor ASN-GW sends a corresponding deregistration message of data channel 2 to the serving base station.
  • Step 20 (Optional) The serving base station sends a H0_Cnf message to the unselected target base station, where the cancel switch cancel indication is carried.
  • Step 21 (Optional) The unselected target base station sends a H0_ACK handover confirmation message to the serving base station.
  • the MS context is released. If the original data path (DP) between the S-BS and the A-ASN still exists, the DP is released.
  • DP original data path
  • a scenario of data integrity When the S-BS receives the H0_Complete message, the data backhaul may not be completed, and the return data channel 2 has not been released.
  • the MS user context cannot be deleted at this time.
  • the MS user's context contains the DP information of the MS. The MS user context is deleted before the DP is released.
  • the technical problem to be solved by the embodiments of the present invention is to provide a method for deleting a terminal context and a system for the terminal to perform handover, and ensuring data back-transmission by correctly selecting the timing of deleting the terminal context.
  • the data channel is normally released.
  • the embodiment of the present invention provides a method for deleting a terminal context. After the terminal is handed over from the source base station to the target base station, the method includes:
  • the target base station sends a return data channel deregistration message to the anchor access service network gateway;
  • the anchor access service network gateway After receiving the deregistration message, the anchor access service network gateway sends a backhaul data channel deregistration message to the source base station;
  • the source base station After receiving the backhaul data channel deregistration message and the H0_Complete message of all target base stations, the source base station deletes the context of the terminal;
  • the target base station includes selected and unselected target base stations, wherein after the selected target base station confirms that the service flow data backhaul of the terminal is completed, the returning data channel is deregistered to the anchor access service network gateway. Message.
  • the embodiment of the present invention further provides a system for a terminal to perform handover, including a source base station, a target base station, and an anchor access service network gateway, where the target base station is used after the terminal switches from the source base station to the target base station.
  • a source base station configured to delete a context of the terminal after receiving a backhaul data channel deregistration message and a HO-Comple te message of all target base stations;
  • the target base station includes selected and unselected target base stations, wherein after the selected target base station confirms that the service flow data backhaul of the terminal is completed, the returning data channel is deregistered to the anchor access service network gateway. Message.
  • the source base station After receiving the backhaul data channel deregistration message and the H0_Comple te message of all the target base stations, the source base station deletes the context of the terminal, so that the handover process is cached in the S-BS.
  • the data is sent to the T-BS through the return channel, ensuring the data integrity sent to the terminal, and also ensuring the normal release of the backhaul data channel.
  • 1 is a schematic diagram of prior art data backhaul
  • FIG. 2 is a flow chart of switching between data backhaul and data integrity in the prior art
  • FIG. 3 is a flowchart of a backhaul data channel deregistration according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a backhaul data channel deregistration according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of deregistering a backhaul data channel according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of a backhaul data channel deregistration according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of deregistering a backhaul data channel according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a system for performing handover by a terminal according to an embodiment of the present invention.
  • a specific embodiment of the present invention provides a method for deleting a terminal context, where the terminal switches from a source base station to a target base station, including the following steps:
  • the target base station sends a return data channel deregistration message to the anchor access service network gateway;
  • the anchor access service network gateway After receiving the deregistration message, the anchor access service network gateway sends a backhaul data channel deregistration message to the source base station;
  • the source base station After receiving the backhaul data channel deregistration message and the H0_Complete message of all target base stations, the source base station deletes the context of the terminal;
  • the target base station includes selected and unselected target base stations, wherein after the selected target base station confirms that the service flow data backhaul of the terminal is completed, the returning data channel is deregistered to the anchor access service network gateway. Message.
  • the selected target base station After the terminal switches from the source base station to the target base station and establishes an air interface connection with the target base station, the selected target base station sends the H0_Comple te message to the anchor access service network gateway, and The H0_Complete message is forwarded by the anchor access service network gateway to the source base station.
  • a relay access service network gateway may also be included between the anchor access service network gateway and the target base station or the source base station, and the relay access service network gateway forwards the deregistration message and the H0_Complete message.
  • Embodiment 1 as shown in Figures 3, 4, and 5.
  • the target base station After the terminal is handed over from the source base station to the target base station, the target base station sends a backhaul data channel deregistration message to the anchor access service network gateway, respectively, for all the information between the respective gateways and the anchor access service network gateway.
  • the data channel is sent back to the de-registered data channel; or the target base station sends a plurality of return data channel de-registration messages to the anchor access service network gateway, respectively, for de-registering the return data channels corresponding to the respective service flows.
  • the target base station includes selected and unselected target base stations, the same below.
  • the service flows that need to perform data integrity guarantee on the terminal are in the source base station S-BS, each target base station T-BS, and the anchor access service network.
  • the gateway Anchor ASN GW performs pre-registration of the data path Data Pathl and Data Path2 and the general data channel Data Path3.
  • each unselected T-BS After receiving the H0_Cnf (Cancel) message, each unselected T-BS sends a backhaul data channel deregistration message to the Anchor ASN-GW to deregister the Data Path1 and/or Data Path3, and the deregistration message may It is a deregistration message, which is used to deregister the Data Path1 and/or Data Path3 of all the pre-established service flows corresponding to the terminal. It is also possible to send multiple de-registration messages to deregister Data Pathl and/or Data Path3 of each service flow. After Data Pathl and/or Data Path3 of all service flows corresponding to the terminal are deregistered, the unselected T-BS deletes the terminal context of the terminal.
  • the selected T-BS after confirming that all the service flows of the terminal are completed, sends a backhaul data channel deregistration message to deregister all the Data Paths corresponding to the terminal, as shown in FIG. 5.
  • the selected T-BS after confirming that a certain service flow of the terminal is completed, separately sends multiple Data Path deregistration messages to deregister each Data Pathl corresponding to the service flow, for example, Figure 3 and Figure 4.
  • the anchor access service network gateway After receiving the one or more backhaul data channel deregistration messages of the target base stations, the anchor access service network gateway sends a backhaul data channel deregistration message to the source base station, respectively, for The backhaul data channel is deregistered; or the anchor access service network gateway receives multiple pieces of deregistration messages of the target base stations, and then sends multiple backhaul data channel deregistration messages to the source base station, respectively, for Deregistering the backhaul data channels corresponding to each service flow separately.
  • the Anchor ASN-GW After receiving the Data Pathl/3 deregistration message sent by the unselected T-BS, the Anchor ASN-GW sends a backhaul data channel deregistration message to the S-BS, and deregisters the corresponding Data Path2.
  • the backhaul data channel deregistration message may be to deregister all the Data Path2 pre-established between the S-BS and the unselected T-BS corresponding to the terminal. It is also possible to send multiple backhaul data channel deregistration messages to deregister each Data Path2 separately.
  • the Anchor ASN-GW After receiving the Data Path1 deregistration message sent by the selected T-BS, the Anchor ASN-GW sends a return data channel deregistration message to the S-BS, and deregisters the corresponding Data Path2, as shown in FIG. 4 and FIG. 5 is shown. Alternatively, after receiving the Data Path1 deregistration message corresponding to all service flows of the terminal, the Anchor ASN-GW sends a backhaul data channel deregistration message to the S-BS, and deregisters all corresponding Data Path2s. As shown in Figure 3.
  • the source base station After receiving all the backhaul data channel deregistration messages and the H0_Complete message, the source base station deletes the context of the terminal.
  • the S-BS confirms that all the T-BS backhaul data channels Data Path2 are deregistered, and after receiving the HO-Complete message, deletes the terminal context of the terminal.
  • a relay access service network gateway may be further included between the anchor access service network gateway and the target base station or the source base station, where the relay access service network gateway pairs the deregistration message and the HO -Complete message is forwarded.
  • Embodiment 2 as shown in Figures 6 and 7. 200.
  • the target base station After the terminal switches from the source base station to the target base station, the target base station sends a backhaul data channel deregistration message to the anchor access service network gateway, respectively, for each of the gateways to the anchored access service network gateway.
  • the data channel is sent back to the de-registered data channel; or the target base station sends a plurality of return data channel de-registration messages to the anchor access service network gateway, respectively, for de-registering the return data channels corresponding to the respective service flows.
  • each service flow that needs to perform data integrity guarantee on the terminal performs Data Pathl between the S-BS and each T-BS and the Anchor ASN GW. / or pre-registration of Data Path3 and / or Data Path2.
  • the unselected T-BS After receiving the H0_Cnf (Cancel) message, the unselected T-BS sends a data channel deregistration message to the Anchor ASN-GW to deregister the Data Path1 and/or Data Path3, and the deregistration message may be All pre-established Data Pathl and/or Data Path3 corresponding to the terminal are deregistered. It is also possible to send multiple de-registration messages to respectively de-register the Data Pathl and/or Data Path3 of each service flow. After all Data Pathl and/or Data Path3 corresponding to the terminal are deregistered, the T-BS deletes the terminal context of the terminal.
  • the selected T-BS After the selected T-BS confirms that all the service flows of the terminal are backhauled, it sends a backhaul data channel deregistration message to deregister all the Data Paths corresponding to the terminal, as shown in Figure 7.
  • the selected T-BS after confirming that a certain service flow back of the terminal is completed, respectively sends a Data Path deregistration message to deregister the Data Pathl corresponding to the service flow, as shown in FIG. 6 Show.
  • the anchor access service network gateway After receiving the deregistration message, the anchor access service network gateway sends only one backhaul data channel deregistration message to the source base station, where the backhaul data channel deregistration message is used to anchor the access service network gateway. Deregister all the backhaul data channels with the source base station.
  • the Anchor ASN-GW After receiving the Data Pathl/3 deregistration message sent by the unselected T-BS and the Data Pathl deregistration message sent by the selected T-BS, the Anchor ASN-GW sends a backhaul data channel deregistration message to The S-BS de-registers all Data Path2s corresponding to the terminal, as shown in FIG. 6 and FIG. 7.
  • the backhaul data channel deregistration message may also be to deregister all Data PathO and Data Path2 corresponding to the terminal. 210.
  • the source base station After receiving the one backhaul data channel deregistration message and the H0_Complete message, deletes the context of the terminal.
  • the S-BS confirms that all T-BS's Da ta Pa th2 is deregistered, and after receiving the HO.Complete message, deletes the terminal's terminal context.
  • the method further includes the first relay access service network gateway forwarding the de-registration message and the HO.Comple te message between the target base station and the anchor access service network gateway, and/or
  • the second relay access service network gateway forwards the deregistration message and the H0_Compl ete message at the anchor access service network gateway and the source base station.
  • the embodiment of the present invention further provides a system for a terminal to perform handover, including a source base station, a target base station, and an anchor access service network gateway, where, when the terminal switches from the source base station to the target base station,
  • a target base station configured to send a backhaul data channel deregistration message to the anchor access service network gateway; and an anchor access service network gateway, configured to send the backhaul data channel to the source base station after receiving the deregistration message Message
  • a source base station configured to delete a context of the terminal after receiving a backhaul data channel deregistration message and a HO.Comple te message of all target base stations
  • the target base station includes selected and unselected target base stations, wherein after the selected target base station confirms that the service flow data backhaul of the terminal is completed, the returning data channel is deregistered to the anchor access service network gateway. Message.
  • the system further includes: a first relay access service network gateway, configured to forward the de-registration message and the HO.Comple te message between the target base station and the anchor access service network gateway, and/or
  • the second relay access service network gateway is configured to forward the de-registration message and the H0_Comple te message in the anchor access service network gateway and the source base station.
  • the selected target base station After the terminal switches from the source base station to the target base station and establishes an air interface connection with the target base station, the selected target base station sends the H0_Comple te message to the anchor access service network gateway, and is connected by the anchor The ingress gateway gateway forwards the H0_Complete message to the source base station.

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Description

删除终端上下文的方法以及终端进行切换的系统
技术领域
本发明实施例涉及通信技术领域， 具体地说， 涉及一种删除终端上下文的 方法以及一种终端进行切换的系统。 背景技术
WiMAX (Wor ldwide Interoperabi l i ty for Microwave Acces s) , 中文全称 是全球微波接入互操作性， 是一种基于 IEEE 802. 16 标准的无线城域网技术。 WiMAX网络主要由三个部分组成即终端（ MS )、接入月良务网（ ASN )包括基站（ BS ) 和接入业务网网关（ASN-GW ), 以及连接服务网 （CSN )。 WiMAX 系统在切换过程 中一般会采取硬切换的方式， 为了避免切换过程中数据的丟失， WiMAX论坛在 NWG1. 5 系统中引入了数据完整性解决方案。 是否采用数据完整性方案以及采用 哪种数据完整性方案是以业务流为粒度的。 即通过各实体间的协商， 切换中可 以只为终端的某个或某些业务流采用数据完整性方案， 或者所有的业务流都不 采用数据完整性方案。 数据完整性方案的一种实现方式是在目标接入服务网
( T-ASN )和锚定接入服务网关 （Anchor ASN-GW ), 锚定接入服务网关 （Anchor ASN-GW )和服务接入服务网 （S-ASN )之间建立从服务基站（ S-BS )到目标基站
( T-BS )的数据回传通道， 将切换过程中緩存在 S-BS的数据通过此回传通道发 送到 T-BS， 从而保证发送给终端的数据完整性。
图 1为现有技术数据回传示意图， 其中
Pa thO为： 未发生切换时服务 ASN与锚定 ASN-GW之间的一般数据通道。 Pa thl为： 用于切换中数据回传的目标 ASN与锚定 ASN-GW之间的回传数据 通道。
Pa th2为： 用于切换中数据回传的服务 ASN与锚定 ASN-GW之间的回传数据 通道。
Pa th3为： 切换完成后目标 ASN与锚定 ASN-GW之间的一般数据通道。 图 2为采用数据回传方式保证数据完整性的切换流程图， 其具体流程如下： Stepl : MS向服务基站发起 M0B_MSH0_REQ切换请求消息。
Step2 : 服务基站向一个或者多个目标基站发起 H0-REQ切换请求消息。 Step3: (可选 ) 目标基站向锚定 ASN-GW发送数据通道 1 (用于一般的数据 传递）和数据通道 1 (用于切换中数据回传） 的预注册消息。
Step4: (可选 )锚定 ASN-GW向服务基站发送数据通道 2 (用于切换中数据 回传） 的预注册消息。
Step5 : 目标基站向服务基站发送 H0_RSP切换回复消息。
Step6: 服务基站向 MS发送 M0B_BSH0_RSP切换回复消息。
Step7 : 服务基站向目标基站发送 H0_ACK切换确认消息。
Step8 : MS向服务基站发送 M0B_H0_ IND消息， 进入切换执行阶段。
Step9: 服务基站向选中的目标基站发送 H0_Cnf 消息。 可选的， 服务基站 向未选中的目标基站发送 H0_Cnf 消息， 其中携带了 cance l切换取消指示。
Stepl O: 目标基站向服务基站发送 H0_ACK切换确认消息。 如果数据通道 1 和 2已经预注册， 此时服务基站可以开始向目标基站进行数据回传。
Stepl l : (可选）如果没有执行 Step3， 此时目标基站向锚定 ASN-GW发送数 据通道 1 (用于一般的数据传递）和数据通道 1 (用于切换中数据回传） 的预注 册消息。
Stepl 2 : (可选）如果没有执行 Step4， 此时锚定 ASN-GW向服务基站发送数 据通道 2 (用于切换中数据回传） 的预注册消息。
Stepl 3: MS在选中的目标基站入网。 成功入网后， 目标基站开始将緩存在 Da ta Integr i ty Buffer (数据完整性緩存器） 的数据下发给 MS。
Stepl4: 目标基站向锚定 ASN-GW发起数据通道 3 (一般数据通道 ) 的注册 流程。
Stepl 5 : (可选）如果没有执行 Step3或 S tepl l，此时目标基站向锚定 ASN-GW 发送数据通道 1 (用于一般的数据传递）和数据通道 1 (用于切换中数据回传） 的预注册消息。
Stepl6: (可选）如果没有执行 Step4或 Stepl2， 此时锚定 ASN-GW向服务 基站发送数据通道 2 (用于切换中数据回传） 的预注册消息。
Stepl7: 目标基站向服务基站发送 H0_Complete消息， 告知服务基站 MS已 经在目标基站成功入网。
Stepl8: 当目标基站判断数据回传结束时， 向锚定 ASN-GW发送数据通道 1 的解注册消息。
Stepl9: 当收到数据通道 1的解注册消息后， 锚定 ASN-GW向服务基站发送 相应的数据通道 2的解注册消息。
Step20: (可选）服务基站向未选中的目标基站发送 H0_Cnf 消息， 其中携 带了 cancel切换取消指示。
Step21: (可选）未选中的目标基站向服务基站发送 H0_ACK切换确认消息。 在所述现有切换流程中 S-BS收到到 H0_Complete消息后， 即释放 MS上下 文。 如果此时 S-BS与 A-ASN之间原有的数据通道（Data Path, DP)依旧存在， 那么释放该 DP。 数据完整性的场景。 当 S-BS收到 H0_Complete消息时， 可能数据回传未完成， 回传数据通道 2还未释放， 此时不能删除 MS用户上下文。 MS用户上下文中包含 了该 MS的 DP信息。 在 DP释放之前删除 MS用户上下文， 如果删除 MS用户上下 的同时删除该 MS对应的所有 DP， 当然也包括用于回传的 DP， 则可能造成回传 无法完成。 如果删除 MS用户上下文时， 不删除该 MS对应的所有 DP， 则该 MS的 未释放 DP将无法正常释放， 会造成 DP释放发生异常和 DP资源的浪费。 发明内容
本发明实施例所要解决的技术问题是提供一种删除终端上下文的方法以及 终端进行切换的系统， 通过正确选择删除终端上下文的时机， 确保数据回传完 成以及回传数据通道正常释放。
为此， 本发明实施例提供了一种删除终端上下文的方法， 当所述终端从源 基站切换到目标基站后， 包括：
目标基站向锚定接入服务网网关发送回传数据通道解注册消息；
锚定接入服务网网关接收所述解注册消息后， 向源基站发送回传数据通道 解注册消息；
源基站在收到所有目标基站的回传数据通道解注册消息以及 H0_Complete 消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
本发明实施例还提供了一种终端进行切换的系统， 包括源基站、 目标基站 以及锚定接入服务网网关， 其中， 当所述终端从源基站切换到目标基站后， 目标基站， 用于向锚定接入服务网网关发送回传数据通道解注册消息； 锚定接入服务网网关， 用于接收所述解注册消息后， 向源基站发送回传数 据通道解注册消息；
源基站， 用于在收到所有目标基站的回传数据通道解注册消息以及 HO-Comple te消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
采用所述的删除终端上下文的方案， 源基站在收到所有目标基站的回传数 据通道解注册消息以及 H0_Comple te 消息后， 删除所述终端的上下文， 从而使 得将切换过程中緩存在 S-BS的数据通过回传通道发送到 T-BS，保证了发送给终 端的数据完整性， 也确保了回传数据通道的正常释放。 附图说明
图 1是现有技术数据回传示意图；
图 2是现有技术采用数据回传方式保证数据完整性的切换流程图； 图 3是本发明实施例一种回传数据通道解注册流程图；
图 4是本发明实施例一种回传数据通道解注册流程图；
图 5是本发明实施例一种回传数据通道解注册流程图；
图 6是本发明实施例一种回传数据通道解注册流程图；
图 7是本发明实施例一种回传数据通道解注册流程图；
图 8是本发明实施例一种终端进行切换的系统示意图； 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明 作进一步地详细描述。
本发明具体实施例提供了一种删除终端上下文的方法， 所述终端从源基站 切换到目标基站， 包括如下步骤：
目标基站向锚定接入服务网网关发送回传数据通道解注册消息；
锚定接入服务网网关接收所述解注册消息后， 向源基站发送回传数据通道 解注册消息；
源基站在收到所有目标基站的回传数据通道解注册消息以及 H0_Complete 消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
在所述终端从源基站切换到目标基站且与目标基站建立空口连接之后， 由 所述被选中的目标基站向锚定接入服务网网关发送所述 H0_Comple te 消息， 且 由所述锚定接入服务网网关转发所述 H0_Complete消息至源基站。
在锚定接入服务网网关和目标基站或源基站之间还可以包括中继接入服务 网网关， 所述中继接入服务网网关对所述解注册消息以及 H0_Complete 消息进 行转发。
以下通过两个具体实施例对本发明一种删除终端上下文的方法进行详细的 说明。
实施例一， 如图 3、 4、 5所示。
100、 当终端从源基站切换到目标基站后， 目标基站分别向锚定接入服务网 网关发送一条回传数据通道解注册消息， 用于对各自与锚定接入服务网网关之 间所有的回传数据通道进行解注册； 或者， 目标基站分别向锚定接入服务网网 关发送多条回传数据通道解注册消息， 用于分别对各个业务流对应的回传数据 通道进行解注册。 （其中， 所述目标基站包括被选中和未被选中的目标基站， 下 同。）
终端在从源基站切换到目标基站过程前的步骤中， 已经对所述终端需要进 行数据完整性保证的各业务流在源基站 S-BS与各目标基站 T-BS以及锚定接入 服务网网关 Anchor ASN GW之间进行了回传数据通道 Data Pathl 和 Data Path2 和一般数据通道 Data Path3预注册。
各个未被选中的 T-BS在收到 H0_Cnf (Cancel)消息后，发送回传数据通道解 注册消息到 Anchor ASN-GW对 Data Pathl和 /或 Data Path3进行解注册， 所述 解注册消息， 可以是一条解注册消息， 用于将该终端对应的预先建立的所有业 务流的 Data Pathl和 /或 Data Path3进行解注册。 也可以是发送多条解注册消 息分别对各个业务流的 Data Pathl和 /或 Data Path3进行解注册。 该终端对应 的所有业务流的 Data Pathl和 /或 Data Pa th3都进行解注册后，未被选中的 T-BS 删除该终端的终端上下文。
被选中的 T-BS， 确认所述终端的所有业务流回传完成后， 发送一条回传数 据通道解注册消息将该终端对应的所有 Data Pathl进行解注册， 如图 5所示。 也可以是， 被选中的 T-BS， 确认所述终端的某个业务流回传完成后， 分别发送 多条 Data Path解注册消息对所述业务流对应的各个 Data Pathl分别进行解注 册， 如图 3和图 4所示。
105、 锚定接入服务网网关接收所述各个目标基站的一条或多条回传数据通 道解注册消息后， 分别向源基站发送一条回传数据通道解注册消息， 用于对与 源基站之间的回传数据通道进行解注册； 或者， 锚定接入服务网网关接收所述 各个目标基站的多条解注册消息后， 分别向源基站发送多条回传数据通道解注 册消息， 用于分别对各个业务流对应的回传数据通道进行解注册。
Anchor ASN-GW收到未被选中的 T-BS发送的 Data Pathl/3解注册消息后， 发送回传数据通道解注册消息到 S-BS， 将与之对应的 Data Path2进行解注册。 同样所述回传数据通道解注册消息， 可以是将该终端对应的所有在 S-BS与未被 选中的 T-BS之间预先建立的 Data Path2进行解注册。 也可以是发送多条回传 数据通道解注册消息对各 Data Path2分别进行解注册。
Anchor ASN-GW收到被选中的 T-BS发送的 Data Pathl解注册消息后， 发送 回传数据通道解注册消息到 S-BS， 将与之对应的 Data Path2进行解注册， 如图 4和图 5所示。 也可以是， Anchor ASN-GW等待收到所述终端所有业务流对应的 Data Pathl解注册消息后， 发送一条回传数据通道解注册消息到 S-BS， 将对应 的所有 Data Path2进行解注册， 如图 3所示。
110、 源基站在收到所述所有的回传数据通道解注册消息以及 H0_Complete 消息后， 删除所述终端的上下文。
S-BS 确认所有的 T-BS 的回传数据通道 Data Path2 解注册， 并且收到 HO-Complete消息后， 删除所述终端的终端上下文。
在所述锚定接入服务网网关和所述目标基站或所述源基站之间还可以包括 中继接入服务网网关， 所述中继接入服务网网关对所述解注册消息以及 HO-Complete消息进行转发。
实施例二， 如图 6、 7所示。 200、 当终端从源基站切换到目标基站后， 目标基站分别向锚定接入服务网 网关发送一条回传数据通道解注册消息， 用于对各自与锚定接入服务网网关之 间所有的回传数据通道进行解注册； 或者， 目标基站分别向锚定接入服务网网 关发送多条回传数据通道解注册消息， 用于分别对各个业务流对应的回传数据 通道进行解注册。
终端在从源基站切换到目标基站过程前的步骤中， 已经对所述终端需要进 行数据完整性保证的各业务流在 S-BS与各 T-BS以及 Anchor ASN GW之间进行 了 Data Pathl和 /或 Data Path3和 /或 Data Path2的预注册。
未被选中的 T-BS在收到 H0_Cnf (Cancel)消息后，发送数据通道解注册消息 到 Anchor ASN-GW对 Data Pathl和 /或 Data Path3进行解注册， 所述解注册消 息， 可以是将该终端对应的所有预先建立的 Data Pathl和 /或 Data Path3进行 解注册。 也可以是发送多条解注册消息分别对各个业务流的 Data Pathl 和 /或 Data Path3分别进行解注册。 该终端对应的所有 Data Pathl和 /或 Data Path3 都进行解注册后， T-BS删除该终端的终端上下文。
被选中的 T-BS确认所述终端的所有业务流回传完成后， 发送一条回传数据 通道解注册消息将该终端对应的所有 Data Pathl进行解注册， 如图 7所示。 也 可以是，被选中的 T-BS，确认所述终端的某个业务流回传完成后，分别发送 Data Path解注册消息对所述业务流对应的 Data Pathl分别进行解注册，如图 6所示。
205、 锚定接入服务网网关接收所述解注册消息后， 向源基站只发送一条回 传数据通道解注册消息， 所述回传数据通道解注册消息用于对锚定接入服务网 网关和源基站之间所有的回传数据通道进行解注册。
Anchor ASN-GW收到所有的未被选中的 T-BS发送的 Data Pathl/3解注册消 息以及被选中的 T-BS发送的 Data Pathl解注册消息后， 发送一条回传数据通 道解注册消息到 S-BS， 将所述终端对应的所有 Data Path2进行解注册， 如图 6 和图 7所示。所述回传数据通道解注册消息也可以是将所述终端对应的所有 Data PathO和 Data Path2进行解注册。 210、 源基站在收到所述的一条回传数据通道解注册消息以及 H0_Comp lete 消息后， 删除所述终端的上下文。
S-BS确认所有的 T-BS的 Da ta Pa th2解注册， 并且收到 HO.Complete消息 后， 删除所述终端的终端上下文。
所述方法还包括第一中继接入服务网网关对所述解注册消息以及 HO.Comple te消息在目标基站和锚定接入服务网网关之间进行转发， 和 /或
第二中继接入服务网网关对所述解注册消息以及 H0_Compl ete 消息在锚定 接入服务网网关和源基站进行转发。
同时， 本发明实施例还提供了一种终端进行切换的系统， 包括源基站、 目 标基站以及锚定接入服务网网关， 其中， 在所述终端从源基站切换到目标基站 时，
目标基站， 用于向锚定接入服务网网关发送回传数据通道解注册消息； 锚定接入服务网网关， 用于接收所述解注册消息后， 向源基站发送回传数 据通道解注册消息；
源基站， 用于在收到所有目标基站的回传数据通道解注册消息以及 HO.Comple te消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
所述系统还包括： 第一中继接入服务网网关， 用于对所述解注册消息以及 HO.Comple te消息在目标基站和锚定接入服务网网关之间进行转发， 和 /或
第二中继接入服务网网关， 用于对所述解注册消息以及 H0_Comple te 消息 在锚定接入服务网网关和源基站进行转发。
在所述终端从源基站切换到目标基站且与目标基站建立空口连接之后， 由 所述被选中的目标基站向锚定接入服务网网关发送所述 H0_Comple te 消息， 且 由所述锚定接入服务网网关转发所述 H0_Complete消息至源基站。 通过对以上实施方式的描述， 本领域的技术人员可以清楚地了解到本发明 可借助软件加必要的通用硬件平台的方式来实现， 当然也可以通过硬件来实现， 以上实施例仅用以说明本发明的技术方案， 而非对其限制； 尽管参照前述实施 例对本发明进行了详细的说明， 本领域的普通技术人员应当理解： 其依然可以 对前述各实施例所记载的技术方案进行修改， 或者对其中部分技术特征进行等 同替换； 而这些修改或者替换， 并不使相应技术方案的本质脱离本发明各实施 例技术方案的精神和范围。

Claims

权利要求
1、 一种删除终端上下文的方法， 当所述终端从源基站切换到目标基站后， 其特征在于， 包括：
目标基站向锚定接入服务网网关发送回传数据通道解注册消息；
锚定接入服务网网关接收所述解注册消息后， 向源基站发送回传数据通道 解注册消息；
源基站在收到切换完成 H0_Comple te 消息以及所有目标基站的回传数据通 道解注册消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
2、 根据权利要求 1所述的方法， 其特征在于，
所述目标基站向锚定接入服务网网关发送回传数据通道解注册消息包括： 目标基站分别向锚定接入服务网网关发送一条回传数据通道解注册消息， 用于对各自与锚定接入服务网网关之间所有的回传数据通道进行解注册； 或者， 目标基站分别向锚定接入服务网网关发送多条回传数据通道解注册消息， 用于 分别对各个业务流对应的回传数据通道进行解注册；
所述锚定接入服务网网关向源基站发送回传数据通道解注册消息包括： 锚定接入服务网网关接收所述各个目标基站的一条或多条解注册消息后， 分别向源基站发送一条回传数据通道解注册消息， 用于对与源基站之间的回传 数据通道进行解注册； 或者， 锚定接入服务网网关接收所述各个目标基站的多 条解注册消息后， 分别向源基站发送多条回传数据通道解注册消息， 用于分别 对各个业务流对应的回传数据通道进行解注册。
3、 根据权利要求 1所述的方法， 其特征在于，
所述目标基站向锚定接入服务网网关发送回传数据通道解注册消息包括： 目标基站分别向锚定接入服务网网关发送一条回传数据通道解注册消息， 用于对各自与锚定接入服务网网关之间所有的回传数据通道进行解注册； 或者， 目标基站分别向锚定接入服务网网关发送多条回传数据通道解注册消息， 用于 分别对各个业务流对应的回传数据通道进行解注册；
所述锚定接入服务网网关向源基站发送回传数据通道解注册消息包括： 锚定接入服务网网关接收所述解注册消息后， 向源基站只发送一条回传数 据通道解注册消息， 所述回传数据通道解注册消息用于对锚定接入服务网网关 和源基站之间所有的回传数据通道进行解注册。
4、 根据权利要求 1 - 3任一条所述的方法， 其特征在于， 在所述终端从源 基站切换到目标基站且与目标基站建立空口连接之后， 由所述被选中的目标基 站向锚定接入服务网网关发送所述 H0_Complete 消息， 且由所述锚定接入服务 网网关转发所述 H0_Complete消息至源基站。
5、 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括：
第一中继接入服务网网关对所述解注册消息以及 H0_Compl ete 消息在目标 基站和锚定接入服务网网关之间进行转发， 和 /或
第二中继接入服务网网关对所述解注册消息以及 H0_Compl ete 消息在锚定 接入服务网网关和源基站进行转发。
6、 一种终端进行切换的系统， 其特征在于， 包括源基站、 目标基站以及锚 定接入服务网网关， 其中， 在所述终端从源基站切换到目标基站后，
目标基站， 用于向锚定接入服务网网关发送回传数据通道解注册消息； 锚定接入服务网网关， 用于接收所述解注册消息后， 向源基站发送回传数 据通道解注册消息；
源基站， 用于在收到切换完成 H0_Complete 消息以及所有目标基站的回传 数据通道解注册消息后， 删除所述终端的上下文；
所述目标基站包括被选中和未被选中的目标基站， 其中， 被选中的目标基 站确认所述终端的业务流数据回传完成后， 向锚定接入服务网网关发送回传数 据通道解注册消息。
7、 根据权利要求 6所述的系统， 其特征在于， 所述系统还包括： 第一中继接入服务网网关， 用于对所述解注册消息以及 H0_Comple te 消息 在目标基站和锚定接入服务网网关之间进行转发， 和 /或
第二中继接入服务网网关， 用于对所述解注册消息以及 H0_Comple te 消息 在锚定接入服务网网关和源基站进行转发。
8、 根据权利要求 6所述的系统， 其特征在于， 在所述终端从源基站切换到 目标基站且与目标基站建立空口连接之后， 由所述被选中的目标基站向锚定接 入服务网网关发送所述 H0_Comple te 消息， 且由所述锚定接入服务网网关转发 所述 HO-Comp lete消息至源基站。
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