WO2010121476A1 - 一种实现多归属核心网网元软卸载的方法及系统 - Google Patents

一种实现多归属核心网网元软卸载的方法及系统 Download PDF

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Publication number
WO2010121476A1
WO2010121476A1 PCT/CN2009/075925 CN2009075925W WO2010121476A1 WO 2010121476 A1 WO2010121476 A1 WO 2010121476A1 CN 2009075925 W CN2009075925 W CN 2009075925W WO 2010121476 A1 WO2010121476 A1 WO 2010121476A1
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Prior art keywords
core network
network element
homed
homing
service
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PCT/CN2009/075925
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English (en)
French (fr)
Inventor
高淑美
何坚强
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中兴通讯股份有限公司
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Priority to US13/258,407 priority Critical patent/US8666418B2/en
Publication of WO2010121476A1 publication Critical patent/WO2010121476A1/zh

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    • 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
    • H04W60/005—Multiple registrations, e.g. multihoming

Definitions

  • the present invention relates to the field of communications, and in particular, to a core network element soft offloading method and system in a multi-homing networking mode. Background technique
  • GSM Global System Mobile
  • BSC Base Station Controller
  • MSC Mobile Switch Center emulator
  • the BSC multi-homing network refers to a BSC that can connect multiple MSCs, as shown in Figure 2.
  • the Serving Node Selection Function (SNSF) is responsible for selecting the MSC, distributing the service to each MSC for processing through a certain algorithm, and realizing the load sharing among the MSCs through dynamic adjustment of the distribution, such as code division multiple access (Code Division) Iu-Flex in the field of A-Flex and Wideband Code Division Multiple Access (WCDMA) in the field of Multiple Access, CDMA.
  • SNSF is located in the BSC.
  • the SNSF will not assign new services to the MSC, and will allocate the new service load of the terminal originally allocated to the MSC to other On the MSC. At the same time, the existing services on the MSC will be completely interrupted at the moment of the MSC failure.
  • a Radio Network Controller (RNC) multi-homed network refers to an RNC that is connected to a plurality of Serving General Package Radion Service Support Nodes (SGSNs). In the mode, similar problems as described above exist when the SGSN is upgraded or the like.
  • the RNC multi-homing networking mode is shown in Figure 3. Summary of the invention
  • the object of the present invention is to provide a soft-to-unload method and system for a core network element in a multi-homed networking mode, which is used to solve the call loss caused by the unloading of the multi-homed core network element due to upgrade, fault or relocation. High technical problems.
  • a method for implementing soft unloading of a multi-homed core network element includes the following steps:
  • Step A The multi-homing core network element to be uninstalled is set to the office-side occlusion state, and no new service is allocated to the multi-homed core network element.
  • Step B When the existing service of the multi-homing core network element to be uninstalled is processed to a predetermined state, it is uninstalled.
  • the step A further includes the process of reallocating the new service originally allocated to the multi-homed core network element to be offloaded to other available multi-homed core network elements.
  • the predetermined state in step B includes a predetermined ratio or a predetermined number of states in which an existing service actively initiates release.
  • Step B also includes the following steps:
  • the setting of the multi-homing core network element to be unloaded to the office-side occlusion state is specifically implemented by the service node selection module recording the office-side state of the multi-homed core network element as an occlusion state.
  • the multi-homed core network element includes a mobile switching center or a serving GPRS support node.
  • a system for implementing soft-offloading of a multi-homed core network element comprising: a network controller and a multi-homing core network element, wherein the multi-homing core network element comprises a multi-homing core network element to be offloaded; a service node selection module, where the service node selection module is configured to set a network element to be uninstalled to be in an office-side occlusion state, and no longer allocate new services to the multi-homed core network element;
  • the home network element of the home network is used to process the existing service, and is uninstalled when the existing service is processed to a predetermined state.
  • the multi-homing core network element further includes other optional multi-homed core network elements, and the service node selection module is further configured to redistribute new services originally allocated to the multi-homed core network element to be offloaded. Go to other multi-homed core network elements to choose from.
  • the predetermined state includes a predetermined ratio or a predetermined number of existing services to initiate release, to enable the multi-homing core network element to be uninstalled to be set to an office-side occlusion state.
  • the service node selection module is further configured to record the multi-homing core network element to be uninstalled as an occlusion state.
  • the multi-homed core network element includes a mobile switching center or a serving GPRS support node.
  • the beneficial effects of the present invention compared to the prior art are:
  • the present invention performs the offloading when the existing service allocated to the multi-homed core network element to be unloaded is processed to a predetermined state, and the existing service allocated to the multi-homed core network element to be offloaded is actively released, The passive release of the multi-homed core network element to be unloaded will reduce the call loss and reduce the impact on the existing service.
  • the present invention redistributes the new service originally allocated to the multi-homed core network element to be unloaded to other optional multi-homed core network elements, and reduces the services to be processed of the multi-homed core network element to be uninstalled. , speeding up the unloading speed of the multi-homed core network element;
  • the predetermined state of the present invention is a state in which a predetermined ratio or a predetermined number of existing services are actively released, and the existing traffic can be set to be completely executed or the existing traffic is small.
  • the acceptable range is the predetermined state, and the unloading at this time can control the call loss to be zero or in a small range;
  • the upgrade of the multi-homed core network element is smooth and upgrade, and has no impact on the newly established service, and the impact on the current existing service may be minimized or not affected;
  • the present invention sets the network element to be offloaded to the multi-homed core network to be in the form of an office-side occlusion.
  • the service node selection module records the office-to-state status of the multi-homed core network element to be unloaded as an occlusion state, and does not require the service node to select. Signaling interaction between the module and the multi-homed core network element to be offloaded;
  • the present invention can be applied to a mobile switching center, a serving GPRS supporting node, or other core network elements of a multi-homed networking mode.
  • Figure 1 shows the common networking mode of the BSC.
  • FIG. 1 shows the BSC multi-homing networking mode
  • FIG. 3 shows the RNC multi-homing networking mode
  • FIG. 5 is a flowchart of soft uninstallation of an SGSN when an SGSN is relocated according to an embodiment of the present invention. detailed description
  • An implementation manner of a system for implementing soft offloading of a multi-homed core network element includes a network controller and a multi-homed core network element.
  • the network controller may be a BSC or an RNC.
  • the multi-homing core network element includes a multi-homing core network element to be offloaded and other optional multi-homed core network elements, which may be MSC, SGSN, GSM or other multi-homing.
  • the network controller includes an SNSF, and the SNSF may be set inside the BSC or the RNC, or may be separately set.
  • the network controller is a BSC;
  • the network controller is an RNC.
  • the SNSF is configured to set the network element to be offloaded to the multi-homed core network to be in an office-side occlusion state, and redistribute the new service originally allocated to the multi-homed core network element to be uninstalled to other multi-homed core network elements, and New services are no longer allocated to the multi-homed core network element to be offloaded.
  • the SNSF sets the multi-homing core network element to be uninstalled to the office-side occlusion state by recording the office-to-off state of the multi-homed core network element to be in the occlusion state.
  • the multi-homed core network element to be unloaded is used to process the existing service.
  • the existing service is processed to a predetermined state
  • the multi-homed core network element to be uninstalled is uninstalled.
  • the predetermined state includes a predetermined ratio or a predetermined number of states in which the existing service actively initiates release, such as zero traffic on the network element to be upgraded or a small proportion of unprocessed traffic, which is within an acceptable range.
  • the present invention provides a method for implementing soft offloading of a network element of a multi-homing core network.
  • the MSC can be upgraded as an example, and the multi-homing core network element MSC to be unloaded is set to an office-side occlusion state, and no new service is allocated to the MSC.
  • the existing service of the MSC is processed to a predetermined state, the MSC is uninstalled, and the predetermined state may be a service processing completion, or may be a state in which a predetermined ratio or a predetermined number of existing services actively initiate release.
  • the present invention provides a method for implementing soft-to-uninstallation of a network element of a multi-homing core network.
  • the SGSN of the multi-homing core network element is also exemplified, and the SGSN to be uninstalled is set to an office-side occlusion state, and no new service is allocated to the SGSN.
  • the existing service of the SGSN is processed to a predetermined state, the SGSN is uninstalled.
  • the present invention provides a method for implementing soft offloading of a multi-homed core network element, and a specific implementation manner thereof is as shown in FIG. 4, which is upgraded by a multi-homing core network element MSC, and the predetermined state is an existing service processing as an example. , indicating the soft uninstallation of the MSC and its subsequent loading process, including the following steps:
  • Step 401 The MSC prepares to upgrade
  • Step 402 The SNSF manages the eNB's office occlusion and occlusion state in advance, and the SNSF marks the MSC as an office occlusion state; the advance time may be set according to specific needs; Step 403: When the SNSF selects the MSC to allocate the service, the MSC in the office-blocking state is not in the selected range, and the SNSF allocates the new service to the other MSCs, and the SNSF no longer allocates new services to the MSC to be upgraded;
  • Step 404 The MSC to be upgraded processes the existing service, and the existing service on the MSC to be upgraded is gradually released over time, so the traffic on the MSC to be upgraded is gradually reduced.
  • Step 405 Determine the MSC to be upgraded. Whether the existing service is processed, and when the processing is finished, the process proceeds to step 406; when the processing is not completed, the process proceeds to step 404;
  • Step 406 The MSC to be upgraded completes the upgrade
  • Step 407 The SNSF manages the occlusion and de-blocking state of the MSC office, and marks the MSC as an office-side unblocking state;
  • Step 408 When the SNSF selects the MSC to allocate the service, the SNSF allocates the service to the MSC that is occluded and the occlusion state is unblocked according to a certain algorithm, and the SNSF allocates a new service to the upgraded MSC, and the MSC has been upgraded to process the new service.
  • a method for implementing soft unloading of a network element is an example in which the SGSN is prepared to be relocated in the WCDMA field, and the predetermined service is processed to a predetermined ratio in a predetermined state.
  • the soft uninstallation of the SGSN and its subsequent loading process are described, which includes the following steps:
  • Step 501 The MSC prepares to move
  • Step 502 The SNSF manages the office occlusion and occlusion state of the SGSN in advance, and the SNSF marks the SGSN as an office occlusion state; the advance time may be set according to specific needs;
  • Step 503 When the SNSF selects the SGSN to allocate the service, the SGSN in the office-side occlusion state is not in the selected range, and the SNSF allocates the new service to the other SGSNs, and the SNSF no longer allocates the new service to the SGSN to be relocated;
  • Step 504 The SGSN to be relocated is used to process the existing service, and the existing service on the SGSN is to be relocated. The time is gradually released, so the traffic on the SGSN to be relocated will gradually decrease.
  • Step 505 Determine whether the existing service on the SGSN to be relocated has reached a predetermined ratio; when the predetermined ratio is reached, go to step 506; when the predetermined ratio is not reached Go to step 504;
  • Step 506 The SGSN is to be relocated.

Description

一种实现多归属核心网网元软卸载的方法及系统 技术领域
本发明涉及通信领域， 尤其涉及一种多归属组网方式下的核心网网元 软卸载方法及系统。 背景技术
在全球移动通信系统（ Global System Mobile, GSM )中， 通常， 一个基 站控制器（ Base Station Controller, BSC )只能接一个移动交换中心（Mobile Switch Center或 Mobile Switch Center emulator, MSC ), 如图 1所示。
BSC多归属组网指的是一个 BSC可以连接多个 MSC,如图 2所示。服 务节点选择模块 ( Serving Node Selection Function, SNSF ) 负责选择 MSC, 通过一定的算法将业务分发到各个 MSC进行处理，通过分发的动态调整实 现各个 MSC间的负荷分担， 如码分多址（ Code Division Multiple Access, CDMA )领域中的 A-Flex和宽带码分多址（WCDMA )领域中的 Iu-Flex。 通常 SNSF位于 BSC内。
在 BSC多归属组网方式下， 若一个 MSC因某种原因故障， 那么 SNSF 就不会将新业务分到该 MSC上， 将原来分配在该 MSC上的终端的新业务 负荷分担分配到其他的 MSC上。 同时， 该 MSC上现有的业务也会在 MSC 故障的瞬间全部中断。
当某个 MSC要进行升级或者搬迁等操作或者由于某些原因不需要用该 MSC时， 会人为造成该 MSC故障， 这样， 原来分配在该 MSC上的终端的 新的业务会重新分配到其他的 MSC上。 但是当前在该 MSC上的业务会在 该 MSC故障的瞬间全部中断， 导致呼损严重， 并且会引起另外一些问题， 比如原来归属在该 MSC上的终端在自主登记到其他 MSC前无法做被叫等。 WCDMA中， 无线网络控制器（ Radio Network Controller, RNC ) 多归 属组网指的是一个 RNC接多个服务通用分组无线业务支持节点 （Serving General Package Radion Service Support Node, SGSN ), 在这种组网方式下， 当 SGSN升级等操作时也存在上述的类似问题。 RNC多归属组网方式如图 3所示。 发明内容
本发明的发明目的是提供一种多归属组网方式下的核心网网元软卸载 方法及系统， 用于解决多归属核心网网元因升级、 故障或搬迁等原因需要 进行卸载时导致呼损率高的技术问题。
本发明的技术问题是通过以下技术方案加以解决的：
一种实现多归属核心网网元软卸载的方法， 包括以下步骤：
步骤 A. 将待卸载多归属核心网网元设置为局向闭塞状态，并不再向该 多归属核心网网元分配新业务；
步骤 B. 当所述待卸载多归属核心网网元的现有业务处理到预定状态 时对其进行卸载。
所述步骤 A还包括将原分配到所述待卸载多归属核心网网元的新业务 重新分配到其他可供选择的多归属核心网网元的过程。
步骤 B中所述预定状态包括预定比例或预定数量的现有业务主动发起 释放的状态。
步骤 B之后还包括以下步骤：
C. 对卸载后的多归属核心网网元进行升级；
D. 当卸载后的多归属核心网网元升级完成后， 将其设置为局向解闭塞 状态， 所述升级后多归属核心网网元开始接收新分配的业务。
将所述待卸载多归属核心网网元设置为局向闭塞状态具体通过服务节 点选择模块将该多归属核心网网元的局向状态记录为闭塞状态加以实现。 所述多归属核心网网元包括移动交换中心或服务 GPRS支持节点。 一种实现多归属核心网网元软卸载的系统， 包括： 网络控制器和多归 属核心网网元， 所述多归属核心网网元包括待卸载多归属核心网网元； 所 述网络控制器包括服务节点选择模块， 所述服务节点选择模块用于将待卸 载多归属核心网网元设置为局向闭塞状态， 并不再向该多归属核心网网元 分配新业务； 所述待卸载多归属核心网网元用于处理现有业务， 且当现有 业务处理到预定状态时进行卸载。
所述多归属核心网网元还包括其他可供选择的多归属核心网网元， 所 述服务节点选择模块还用于将原分配到所述待卸载多归属核心网网元的新 业务重新分配到其他可供选择的多归属核心网网元。
所述预定状态包括预定比例或预定数量的现有业务主动发起释放的状 态， 以实现将所述待卸载多归属核心网网元设置为局向闭塞状态。
所述服务节点选择模块还用于将待卸载多归属核心网网元记录为闭塞 状态。
所述多归属核心网网元包括移动交换中心或服务 GPRS支持节点。 本发明与现有技术相比较的有益效果是：
( 1 )本发明使分配在待卸载多归属核心网网元上的现有业务处理到预 定状态时才进行卸载， 分配到待卸载多归属核心网网元上的现有业务是主 动释放， 不会因为待卸载多归属核心网网元的卸载而被动释放， 减少了呼 损， 可以减小对现有业务的影响；
( 1 )本发明将原分配到待卸载多归属核心网网元的新业务重新分配到 其他可供选择的多归属核心网网元， 减少了待卸载多归属核心网网元的需 处理的业务， 加快了多归属核心网网元的卸载速度；
( 2 )本发明的预定状态， 为预定比例或预定数量的现有业务主动发起 释放的状态， 可设定现有的业务量全部执行完毕或者现有的业务量在很小 的能接受的范围内为预定状态， 此时进行卸载可使呼损控制为零或者在很 小的范围内；
( 3 )本发明对多归属核心网网元的升级是平滑升级， 对新建立的业务 没有影响， 对当前存在的业务影响可以降到最低或者没有影响；
( 4 )本发明将待卸载多归属核心网网元设置为局向闭塞状， 是通过服 务节点选择模块将待卸载多归属核心网网元的局向状态记录为闭塞状态， 不需要服务节点选择模块与待卸载多归属核心网网元之间的信令交互；
( 5 )本发明可用于移动交换中心、 服务 GPRS支持节点或者其他多归 属组网方式的核心网网元。 附图说明
图 1为 BSC普通的组网方式；
图 2为 BSC多归属组网方式；
图 3为 RNC多归属组网方式；
图 4为本发明具体实施方式 MSC升级时， MSC软卸载及后续加载流 程图；
图 5为本发明具体实施方式 SGSN搬迁时， SGSN软卸载流程图。 具体实施方式
下面用具体实施方式结合附图对本发明作进一步详细说明。
本发明提出的实现多归属核心网网元软卸载的系统的一种实施方式， 包括网络控制器和多归属核心网网元。网络控制器具体可以是 BSC或 RNC, 多归属核心网网元包括待卸载多归属核心网网元和其他可供选择的多归属 核心网网元， 具体可以是 MSC、 SGSN, GSM或其他多归属组网方式的核 心网网元。 网络控制器包括 SNSF, SNSF可设置在 BSC或 RNC的内部， 也可单独设置。例如， 当多归属核心网网元为 MSC时， 网络控制器为 BSC; 当多归属核心网网元为 SGSN时， 网络控制器为 RNC。 SNSF用于将待卸 载多归属核心网网元设置为局向闭塞状态， 将原分配到待卸载多归属核心 网网元的新业务重新分配到其他可供选择的多归属核心网网元， 并不再向 待卸载多归属核心网网元分配新业务。 SNSF具体通过将待卸载多归属核心 网网元的局向状态记录为闭塞状态的方式， 将待卸载多归属核心网网元设 置为局向闭塞状态。 待卸载多归属核心网网元用于处理现有业务， 当现有 业务处理到预定状态时， 待卸载多归属核心网网元进行卸载。 预定状态包 括预定比例或预定数量的现有业务主动发起释放的状态， 如待升级网元上 的业务量为零或者未处理的业务量占很小比例， 在能接受的范围内。
本发明一种实现多归属核心网网元软卸载的方法，可以 MSC升级为例， 将待卸载的多归属核心网网元 MSC设置为局向闭塞状态， 不再向该 MSC 分配新业务， 当该 MSC的现有业务处理到预定状态时， 对该 MSC进行卸 载， 预定状态可以是业务处理完毕， 也可以是预定比例或预定数量的现有 业务主动发起释放的状态。
本发明一种实现多归属核心网网元软卸载的方法， 也可以多归属核心 网网元 SGSN搬迁为例， 将待卸载的 SGSN设置为局向闭塞状态， 不再向 该 SGSN分配新业务，当该 SGSN的现有业务处理到预定状态时，对该 SGSN 进行卸载。
本发明一种实现多归属核心网网元软卸载的方法， 其一种具体实施方 式， 其如图 4所示， 以多归属核心网网元 MSC升级， 预定状态为现有业务 处理完为例， 说明 MSC的软卸载及其后续加载流程， 包括如下步骤：
步骤 401: MSC准备升级；
步骤 402: SNSF提前一定的时间对该 MSC的局向闭塞、 解闭塞状态 进行管理， SNSF将该 MSC标记为局向闭塞状态； 提前的时间可根据具体 需要进行设定； 步骤 403: SNSF选择 MSC分配业务时， 局向闭塞状态的 MSC不在选 择的范围内， SNSF将新业务分配给其他可供选择的 MSC,此时 SNSF不再 向待升级 MSC分配新业务；
步骤 404: 待升级 MSC处理现有业务， 待升级的 MSC上现有的业务 随着时间的推移会逐渐释放， 所以待升级的 MSC上的业务量会逐渐减少， 步骤 405: 判断待升级 MSC上现有业务是否处理完毕， 处理完时转步 骤 406; 未处理完时转步骤 404;
步骤 406: 待升级 MSC完成升级；
步骤 407: SNSF对该 MSC局向的闭塞、 解闭塞状态进行管理， 将该 MSC标记为局向解闭塞状态；
步骤 408: SNSF选择 MSC分配业务时， 按一定的算法分配业务到局 向闭塞、解闭塞状态为解闭塞的 MSC上， SNSF向已升级 MSC分配新业务， 已升级 MSC处理新业务。
本发明一种实现网元软卸载的方法， 其另一种具体实施方式， 如图 5 所示， 为 WCDMA领域中， 以 SGSN准备搬迁， 以预定状态为现有业务处 理到预定比例为例， 说明 SGSN的软卸载及其后续加载流程， 其包括如下 步骤：
步骤 501 : MSC准备搬迁；
步骤 502: SNSF提前一定的时间对该 SGSN的局向闭塞、 解闭塞状态 进行管理， SNSF将该 SGSN标记为局向闭塞状态； 提前的时间可根据具体 需要进行设定；
步骤 503: SNSF选择 SGSN分配业务时， 局向闭塞状态的 SGSN不在 选择的范围内， SNSF将新业务分配给其他可供选择的 SGSN, 此时 SNSF 不再向待搬迁 SGSN分配新业务；
步骤 504:待搬迁 SGSN处理现有业务，待搬迁 SGSN上现有的业务随 着时间的推移会逐渐释放， 所以待搬迁 SGSN上的业务量会逐渐减少； 步骤 505: 判断待搬迁 SGSN上现有业务是否已达到预定比例； 达到预 定比例时转步骤 506; 未达到预定比例时转步骤 504;
步骤 506: 待搬迁 SGSN完成搬迁。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说 明， 不能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术 领域的普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若 干筒单推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1.一种实现多归属核心网网元软卸载的方法， 其特征在于， 包括以下 步骤：
将待卸载多归属核心网网元设置为局向闭塞状态， 并不再向该多归属 核心网网元分配新业务；
当所述待卸载多归属核心网网元的现有业务处理到预定状态时对所述 待卸载多归属核心网网元进行卸载。
2.根据权利要求 1 所述的方法， 其特征在于， 在将所述待卸载多归属 核心网网元设置为局向闭塞状态后， 该方法还包括： 将原分配到所述待卸 载多归属核心网网元的新业务重新分配到其他可供选择的多归属核心网网 元的过程。
3.根据权利要求 1 所述的方法， 其特征在于， 所述预定状态包括预定 比例或预定数量的现有业务主动发起释放的状态。
4.根据权利要求 1 所述的方法， 其特征在于， 对所述待卸载多归属核 心网网元进行卸载后， 该方法还包括：
对所述卸载后的多归属核心网网元进行升级；
当所述卸载后的多归属核心网网元升级完成后， 将其设置为局向解闭 塞状态， 开始接收新分配的业务。
5.根据权利要求 1至 4中任意一项所述的方法， 其特征在于， 将所述 待卸载多归属核心网网元设置为局向闭塞状态具体为： 通过服务节点选择 模块将所述待卸载多归属核心网网元的局向状态记录为闭塞状态。
6.根据权利要求 1至 4中任意一项所述的方法， 其特征在于， 所述多 归属核心网网元包括移动交换中心或服务 GPRS支持节点。
7.一种实现多归属核心网网元软卸载的系统， 其特征在于， 包括： 网络控制器和多归属核心网网元， 所述多归属核心网网元包括待卸载 多归属核心网网元； 所述网络控制器包括服务节点选择模块； 所述服务节点选择模块用于将待卸载多归属核心网网元设置为局向闭 塞状态， 并不再向该多归属核心网网元分配新业务；
所述待卸载多归属核心网网元用于处理现有业务， 且当现有业务处理 到预定状态时进行卸载。
8.根据权利要求 7所述的系统， 其特征在于， 所述多归属核心网网元 还包括其他可供选择的多归属核心网网元， 所述服务节点选择模块还用于 将原分配到所述待卸载多归属核心网网元的新业务重新分配到其他可供选 择的多归属核心网网元。
9.根据权利要求 7所述的系统， 其特征在于， 所述预定状态包括预定 比例或预定数量的现有业务主动发起释放的状态。
10. 根据权利要求 7至 9中任意一项所述的系统， 其特征在于， 所述 服务节点选择模块还用于将待卸载多归属核心网网元记录为闭塞状态， 以 实现将所述待卸载多归属核心网网元设置为局向闭塞状态。
11.根据权利要求 7至 9中任意一项所述的系统， 其特征在于， 所述多 归属核心网网元包括移动交换中心或服务 GPRS支持节点。
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