WO2009152779A1 - 实现pdn连接释放的方法、装置和*** - Google Patents

实现pdn连接释放的方法、装置和*** Download PDF

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Publication number
WO2009152779A1
WO2009152779A1 PCT/CN2009/072358 CN2009072358W WO2009152779A1 WO 2009152779 A1 WO2009152779 A1 WO 2009152779A1 CN 2009072358 W CN2009072358 W CN 2009072358W WO 2009152779 A1 WO2009152779 A1 WO 2009152779A1
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WO
WIPO (PCT)
Prior art keywords
mme
pdn connection
bearer
pdn
user terminal
Prior art date
Application number
PCT/CN2009/072358
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English (en)
French (fr)
Inventor
熊春山
Original Assignee
大唐移动通信设备有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to KR1020117001443A priority Critical patent/KR101212190B1/ko
Priority to EP09765418.0A priority patent/EP2299770A4/en
Priority to US13/000,091 priority patent/US20110164566A1/en
Publication of WO2009152779A1 publication Critical patent/WO2009152779A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method, device and system for implementing PDN connection release.
  • the UE sends a PDN Disconnection Request (LBI) message to the MME (Mobility Management Entity, mobility management entity); wherein the LBI indicates a default bearer of the separated PDN;
  • LBI PDN Disconnection Request
  • the MME After receiving the PDN detach request message, the MME sends a Delete Bearer Request (TEID, LBI) message to the Serving GW (Service Gateway), requesting to delete all EPSs (Evolved Packet System) under the PDN connection. System)
  • TEID Delete Bearer Request
  • LBI Serving GW
  • the Serving GW After receiving the delete bearer request message, the Serving GW sends a Delete Bearer Request (TEID, LBI) message to the PDN GW (Packet Data Gateway), requesting to delete all EPS bearers under the PDN connection;
  • TEID Delete Bearer Request
  • LBI Packet Data Gateway
  • PDN GW to delete the PDN connection in the EPS bearer after all, respond to the Serving GW in response to the carrier remove 7 (Delete Bearer Response) message;
  • the PDN GW interacts with the PCRF to indicate that the EPS bearer is released.
  • the Serving GW After receiving the response to delete the bearer response message, the Serving GW sends a Delete Bearer Response message to the MME;
  • the MME After receiving the response to delete the bearer response message, the MME initiates deactivation of all bearers under the PDN connection to the eNodeB (base station); after releasing the corresponding radio bearer, the eNodeB responds to the deactivation confirmation message to the MME; 8. If the subscriber's subscription data indicates that the UE is allowed to switch from the 3GPP (Third Generation Partnership Project) access technology to the Non-3GPP access technology, the MME sends an Update Location Request message to the HSS. (Home Subscriber Server, home user server;), requesting the HSS to delete the PDN GW address information of the APN (Access Point Name) corresponding to the PDN;
  • APN Access Point Name
  • the HSS After deleting the address information of the PDN GW of a given APN according to the received update location request message, the HSS responds to the MME with an Update Location Response (Update Location Response) message; however, it should be noted that when the user is in the HSS
  • Update Location Response Update Location Response
  • the UE cannot initiate the release process of the PDN connection, that is, the release of the PDN connection cannot be implemented. A new solution is needed for this. Summary of the invention
  • the problem to be solved by the present invention is to provide a method, apparatus and system for implementing PDN connection release, which can realize the release of PDN connection when the subscriber's subscription data in the HSS changes.
  • a method for implementing PDN connection release includes the following steps:
  • the HSS When the subscription data of the user in the home user server HSS changes, the HSS notifies the mobility management entity MME to trigger the release of the PDN connection of the packet data network;
  • the MME requests the serving gateway Serving GW and the packet data gateway according to the notification of the HSS.
  • the PDN GW deletes all bearers under the PDN connection
  • the MME then requests the user terminal to deactivate all bearers of the PDN connection.
  • the MME requests the user terminal to deactivate all the bearers of the PDN connection, including:
  • the MME initiates deletion of all radio access bearer requests under the PDN connection to the base station, and initiates deactivation of all bearer requests under the PDN connection to the user terminal;
  • the base station releases the corresponding radio access bearer according to the deletion request
  • the base station After the user terminal deletes the corresponding bearer context according to the deactivation request, the base station returns a response to the MME.
  • the MME sends a non-access stratum deactivation bearer request message to the user terminal by using the base station. Initiating a deactivation of the bearer request; the deactivation bearer request message is included in the manner of a backpack
  • the MME sends an S1-MME interface message to the base station to delete all radio access bearer requests under the PDN connection;
  • the base station requests the user terminal to delete the corresponding radio resource by sending a radio resource configuration request message to the user terminal; the deactivation bearer request message is included in the radio resource configuration request message in a backpack manner;
  • the user terminal returns a response by sending a radio resource configuration response message to the base station; the user terminal sends a deactivated bearer response message of the non-access stratum to the MME through the base station, and the deactivated bearer response is: The radio resource configuration response message;
  • the base station notifies the MME that the deletion of all radio access bearers under the PDN connection is completed by sending an S1-MME interface response message to the MME; the user terminal sends a response message to the MME's non-access stratum to deactivate the bearer.
  • the method is included in the S1-MME interface response message sent by the base station to the MME.
  • the MME requesting the user terminal to deactivate all the bearers of the PDN includes: when the MME and the UE enter the connection state from the idle state, the MME and the user terminal complete synchronization of the bearer context of the evolved packet system;
  • the UE In the process of the bearer context synchronization of the evolved packet system, the UE deletes all bearer contexts under the PDN connection according to the request of the MME.
  • the method further comprises the following steps:
  • the user terminal initiates a PDN connection request message; the request message includes a default access point name indication identifier.
  • the HSS sends an insert user data message to the current MME of the user terminal, to notify the MME that the subscription data of the user in the HSS has changed.
  • the MME requests the Serving GW and the PDN GW to delete all bearers under the PDN connection, including the following steps:
  • the MME sends a delete bearer request message to the Serving GW, requesting to delete all bearers under the PDN connection;
  • the Serving GW sends a delete bearer request message to the PDN GW, requesting to delete all bearers under the PDN connection;
  • the PDN GW receives the request message of the Serving GW, and after deleting all the bearers in the PDN connection, sends a response to the Serving GW to delete the 7-load response message;
  • the Serving GW After receiving the response message from the PDN GW, the Serving GW responds to the MME with a delete response message to notify the MME that the Serving GW and the PDN GW have deleted all bearers under the PDN connection.
  • a home user server HSS including: a storage unit and a trigger unit; wherein
  • the storage unit is configured to: store subscription data of the user, and notify the trigger unit when the subscription data of the user changes;
  • the triggering unit is configured to: trigger release of the PDN connection according to the notification of the storage unit.
  • the triggering unit further includes: a first receiving unit and a first sending unit; wherein, the first receiving unit is configured to: receive a notification of the storage unit;
  • the first sending unit is configured to: send an insert user data message to the current MME of the user terminal according to the notification received by the first receiving unit, to trigger release of the PDN connection.
  • a mobility management entity MME comprising: a first requesting unit and a second requesting unit; wherein, the first requesting unit is configured to: request a serving gateway and a packet data gateway to delete the PDN connection release trigger notification sent by the HSS Determining all bearers under the PDN connection, and notifying the second request unit after the serving gateway and the packet data gateway complete the request operation;
  • the second requesting unit is configured to: request, according to the notification by the first requesting unit, the user terminal to deactivate all the bearers in the PDN connection and request the base station to delete all the radio access bearers in the PDN connection.
  • the second requesting unit further includes: a second sending unit and a second receiving unit, where the second sending unit is configured to: send, to the base station, a request to delete all radio access bearers under the PDN connection, The base station is configured to release the corresponding radio access bearer; and the user terminal is configured to send all the bearer requests under the deactivated PDN connection to notify the user terminal to delete all bearers under the PDN connection;
  • the second receiving unit is configured to: receive a response after the base station deletes all the radio access bearers in the PDN connection, and a response returned by the base station after the user terminal deletes all the bearers in the PDN connection.
  • a system for implementing PDN connection release comprising the HSS of any of the above, and the MME of any of the above.
  • the PDN connection is triggered by the HSS using the method, apparatus and system of the present invention.
  • the release process solves the problem that the UE cannot initiate the release process of the PDN connection when the user's subscription data changes; in addition, the problem of re-establishing the Default APN connection when the UE's Default APN is deleted is also solved;
  • the system has been slightly modified and enhanced system functionality.
  • FIG. 1 is a schematic diagram of a release process of a PDN connection initiated by a UE in the prior art
  • FIG. 2 is a schematic flow chart of a method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a PDN connection release process triggered by an HSS according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic diagram of a PDN connection release process triggered by an HSS according to Embodiment 3 of the present invention
  • FIG. 5 is a schematic structural diagram of an HSS according to Embodiment 4 of the present invention
  • FIG. 6 is a schematic structural diagram of an MME according to Embodiment 5 of the present invention.
  • the basic idea of the present invention is that when the subscriber's subscription data in the HSS changes, in particular, when the APN currently being used by the UE is deleted, the HSS triggers the release process of the PDN connection according to the learned subscription data of the modified user.
  • the problem that the release process of the PDN connection cannot be initiated when the user's subscription data changes is solved.
  • Embodiment 1 of the present invention provides a method for implementing PDN connection release. As shown in FIG. 2, the method includes:
  • Step 201 When the subscription data of the user in the HSS changes, the HSS notifies the MME to trigger the release of the PDN connection.
  • the HSS when the subscription data of the user in the HSS is changed, in particular, when the APN currently being used by the UE is deleted, the HSS sends an Insert Subscriber Data message to the current MME of the UE, to notify the MME of the user.
  • the subscription data in the HSS has changed (for example, the APN currently being used by the UE is deleted), thereby triggering the separation (release) process of the PDN connection, to solve the problem that the UE cannot initiate the PDN in the existing method in this case.
  • the HSS may also notify the MME that the subscription data of the user has changed by other means, so as to trigger the separation of the PDN connection, which is not described herein.
  • Step 202 The MME requests the Serving GW and the PDN GW to delete all bearers under the PDN connection according to the notification message of the HSS.
  • the MME After receiving the notification of the HSS (for example, inserting the user data information), the MME finds that the APN that the UE is currently using is deleted by the subscription data, and the MME sends a Delete Bearer Request (TEID, LBI) message to the Serving GW.
  • TEID Delete Bearer Request
  • the Serving GW sends a Delete Bearer Request (TEID, LBI) message to the PDN GW according to the request of the MME, requesting to delete all EPS bearers under the PDN connection; and the PDN GW Receiving the request of the Serving GW, and after deleting all EPS bearers under the PDN connection, responding to the Serving GW with a Delete Bearer Response message, and after receiving the response message, the Serving GW should delete the 7-load response to the MME.
  • TEID Delete Bearer Request
  • the request to delete the bearer request and the delete bearer response in the above information interaction process are not limited to the delete bearer request message and the delete bearer response message, and may also be implemented by other methods or messages. This article will not go into details.
  • Step 203 The MME then requests the user terminal to deactivate all the bearers of the PDN connection and request the eNodeB to delete the radio access bearer corresponding to all the bearers in the PDN connection.
  • the MME requests the user terminal to deactivate all the bearers of the PDN connection and requests the eNodeB to delete the radio access bearers corresponding to all the bearers in the PDN connection, but is not limited to the following two situations. :
  • the MME If there is a NAS (Non-Access Stratum) signaling connection between the UE and the MME, the MME first initiates a request message to the eNodeB to delete the radio access bearer corresponding to all the bearers in the PDN connection. At the same time, the MME initiates a deactivation of all the bearer requests in the PDN connection to the UE.
  • NAS Non-Access Stratum
  • the MME initiates a request to delete the radio access 7 corresponding to all the bearers of the PDN connection to the eNodeB, and the SAE (System Architecture Evolution, system architecture) Evolution) ⁇ SAE Bearer Release Command message is implemented, MME passes eNodeB Sending a Deactivate Bearer Request message of the NAS to the UE to initiate a deactivation bearer request, where the Deactive Bearer Request message is included in the SAE Bearer Release Command message of the SI-MME interface, that is, by using a backpack ( The method of piggybacking is to deactivate the bearer request and deliver it to the UE; here, the implementation method is given by the two messages, and of course, it can also be implemented by other messages, and the embodiment is not limited thereto;
  • the eNodeB After receiving the Delete Radio Access Bearer Request message sent by the MME, the eNodeB sends an RRC (Radio Resource Configuration) message to the UE, requesting the UE to delete the corresponding radio resource, and the message includes the MME in a piggyback manner.
  • RRC Radio Resource Configuration
  • the UE After deleting the corresponding bearer context according to the request of the eNodeB, the UE responds to the RRC radio resource configuration response (Radio Resource Configuration Response) message to the eNodeB, and the UE sends the deactivated bearer request to the UE according to the MME transmitted by the eNodeB in a backpack manner (Deactivate Bearer) Request ) Delete all bearers under this PDN connection, and then respond to the MME with a Deactivate Bearer Response message.
  • the Radio Resource Configuration Response message includes a piggybacked NAS deactivation Bearer Response message to the MME.
  • the eNodeB sends a SAE Bearer Release Complete message to the MME according to the response message returned by the UE, and notifies the MME that the deletion of all EPS bearers under the PDN connection is completed; and the message includes the UE in a piggyback manner. Deactivate Bearer Response message;
  • NAS Non-Access Stratum
  • the MME cannot directly initiate a request message to the eNodeB to deactivate all bearers under the PDN connection, but instead
  • the UE and the MME perform synchronization of the Evolved Packet System bearer context (EPS Bearer Context) (this synchronization process can be implemented in the manner of the prior art, and will not be described in detail herein);
  • EPS Bearers Evolved Packet System bearer context
  • the deleted APN is the Default APN of the UE
  • all EPS bearers under the PDN connection are deleted.
  • the UE initiates a UE Requested PDN Connectivity procedure, which is in section 5.10 of the standard TS 23.401 v8.2.0. It has been defined in .2, and will not be described in detail in this document.
  • the default APN indicator is used in the PDN Connectivity Request message sent by the UE to indicate that the MME establishes the EPS Bearer of the Default APN.
  • the problem of the Default APN connection is re-established.
  • the PDN connection release process triggered by the HSS includes the following steps:
  • the HSS sends an Insert Subscriber Data message to the current MME of the UE.
  • the MME learns, according to the message sent by the HSS, that an APN that the UE is using is deleted by the subscription data, and then sends a Delete Bearer Request (TEID, LBI) message to the Serving GW, requesting to delete all EPS bearers under the PDN connection;
  • TEID Delete Bearer Request
  • S303 The Serving GW sends a Delete Bearer Request! TEID, LBI message to the PDN GW, requesting to delete all EPS bearers under the PDN connection;
  • S305 The PDN GW interacts with the PCRF to indicate that the EPS bearer is released.
  • S306 The Serving GW responds to the MME with a Delete Bearer Response message.
  • the MME sends an SAE Bearer Release Command message to the eNodeB, and initiates deleting all radio access bearer requests of the PDN, and the MME sends a Deactivate Bearer Request message to the UE.
  • the SAE Bearer Release Command message is a backpack (iggyback)
  • the mode includes the Deactivate Bearer Request message;
  • the eNodeB sends a Radio Resource Configuration request message to the UE, requesting the UE to delete the corresponding radio resource, and the request message includes the MME in a piggyback manner. Deactivate Bearer Request message sent to the UE;
  • the UE After deleting the corresponding 7-carrier and wireless 7-load, the UE responds to the eNodeB with a Radio Resource Configuration Response message and responds to the MME with a Deactivate Bearer Response message; wherein, the Radio Resource Configuration Response response message is a backpack (iggyback)
  • the eNodeB receives the Radio Resource Configuration Response message sent by the UE, and after releasing the corresponding radio bearer and the access bearer, sends an SAE Bearer Release Complete message of the S1-MME interface to the MME. Meanwhile, the message is in the form of a piggyback
  • the Deactivate Bearer Response message sent by the UE to the MME is included; the release process of the PDN connection is completed.
  • Embodiment 3 of the present invention when the UE is in an idle state, the HSS triggered PDN connection release process includes the following steps:
  • the HSS sends an Insert Subscriber Data message to the current MME of the UE.
  • the MME learns, according to the message sent by the HSS, that an APN used by the UE is deleted by the subscription data, and then sends a Delete Bearer Request (TEID, LBI) message to the Serving GW, requesting to delete all EPS bearers under the PDN connection;
  • TEID Delete Bearer Request
  • S403 The Serving GW sends a Delete Bearer Request! TEID, LBI message to the PDN GW, requesting to delete all EPS bearers under the PDN connection;
  • S405 PDN GW interacts with the PCRF to indicate that the EPS bearer is released
  • S406 Serving GW responds to the MME with a Delete Bearer Response message
  • the MME cannot directly send a message to the eNodeB and the UE because the UE is in an idle state and does not establish a signaling connection with the MME.
  • the UE when the UE enters the connection state from the idle state, the UE establishes a signaling connection with the MME, and at this time, performs synchronization of the EPS Bearer Context between the UE and the MME.
  • the synchronization process can be implemented in the prior art.
  • the UE deletes the corresponding request to deactivate all EPS bearers (EPS Bearers) connected to the PDN according to the indication of the MME, and notifies the MME after the deletion is completed.
  • EPS Bearers EPS Bearers
  • the S5/S8 interface between the Serving GW and the PDN GW In the above embodiments 2 and 3, the S5/S8 interface between the Serving GW and the PDN GW In the GTP protocol (GPRS Tunneling Protocol, GPRS General Packet Radio Service Tunneling Protocol), if the S5/S8 interface uses the PMIP (Proxy Mobile IP) protocol, the steps corresponding to the identifier (A) in the figure can be used. The implementation of the steps defined in the standard TS23.402 will not be repeated here.
  • GTP GPRS Tunneling Protocol, GPRS General Packet Radio Service Tunneling Protocol
  • PMIP Proxy Mobile IP
  • the release process of the PDN connection is triggered by the HSS, which solves the problem that the UE cannot initiate the release process of the PDN connection when the subscription data of the user changes, and also solves the problem that when the UE's Default APN is When the network is deleted, the problem of the Default APN connection is re-established; and the changes to the existing system are small, and the performance of the system is improved, and the system overhead is also saved.
  • the fourth embodiment of the present invention further provides a home user server HSS, including: a storage unit 501 and a trigger unit 502;
  • the storage unit 501 is configured to: store subscription data of the user, and notify the trigger unit 502 when the subscription data of the user changes;
  • the triggering unit 502 is configured to: trigger the release of the PDN connection according to the notification of the storage unit 501.
  • the triggering unit 502 further includes: a first receiving unit and a first sending unit; the first receiving unit is configured to: receive a notification of the storage unit; the first sending unit is configured to: receive according to the first The notification received by the unit sends an insert user data message to the current MME of the user terminal to trigger the release of the PDN connection.
  • the embodiment 5 of the present invention further provides a mobility management entity MME, including: a first request unit 601 and a second request unit 602;
  • the first requesting unit 601 is configured to: request the serving gateway and the packet data gateway to delete all bearers under the PDN connection according to the PDN connection release trigger notification sent by the HSS, and complete the request operation at the serving gateway and the packet data gateway. After the second request unit 602 is notified;
  • the second requesting unit 602 is configured to: according to the notification of the first requesting unit 601, request the user terminal to deactivate all bearers under the PDN connection and request the base station to delete all radio access bearers under the PDN connection.
  • the second requesting unit further includes: a second sending unit and a second receiving unit, where the second sending unit is configured to: send a request to the base station to delete all radio access bearers under the PDN connection, to notify the base station And releasing the corresponding radio access bearer; and sending, to the user terminal, all the bearer requests in the deactivated PDN connection, to notify the user terminal to delete all the bearers in the PDN connection;
  • the receiving unit is configured to: receive a response after the base station deletes all the radio access bearers in the PDN connection, and a response returned by the base station after the user terminal deletes all the bearers in the PDN connection.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or technical field Any other form of storage medium known.

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Description

实现 PDN连接释放的方法、 装置和***
技术领域
本发明涉及移动通信技术领域， 尤其涉及一种实现 PDN连接释放的方法、 装置和***。 n 文不'
目前的移动通信***中， 当需要释放 PDN ( Packet Data Network, 分组数 据网 ) Connection连接时， 通常由 UE ( User Equipment, 用户终端 )发起 PDN 连接的释放过程； 该释放过程已由标准 TS23.401v8.2.0的章节 5.10.3定义， 如 图 1所示， 包括以下步骤：
1、 UE发送 PDN分离请求（PDN Disconnection Request ) ( LBI ) 消息给 MME ( Mobility Management Entity, 移动性管理实体）； 其中 LBI指示被分离 的 PDN的缺省 7 载（ default bearer );
2、 MME接收到 PDN分离请求消息后， 发送删除承载请求（ Delete Bearer Request ) ( TEID, LBI ) 消息给 Serving GW (服务网关）， 请求删除此 PDN连 接下所有的 EPS ( Evolved Packet System, 演进分组*** )承载；
3、 Serving GW接收到删除承载请求消息后发送删除承载请求 （Delete Bearer Request ) ( TEID, LBI )消息给 PDN GW (分组数据网关）， 请求删除此 PDN连接下所有的 EPS承载；
4、 PDN GW在删除此 PDN连接下所有的 EPS承载后， 向 Serving GW回 应删除7 载响应 （ Delete Bearer Response ) 消息；
5、 而当 PCRF ( Policy and Charging Rules Function, 策略与计费规则功能 ) 被应用到该 PDN网络时， PDN GW与 PCRF进行交互以指示 EPS承载被释放；
6、 Serving GW接收到回应删除承载响应消息后发送删除承载响应（ Delete Bearer Response ) 消息给 MME;
7、 MME接收到回应删除承载响应消息后， 向 eNodeB (基站 )发起去激 活此 PDN连接下的所有承载； eNodeB释放相应的无线承载后， 回应去激活确 认消息给 MME; 8、如果用户的签约数据指示允许 UE从 3GPP ( Third Generation Partnership Project , 第三代合作项目 )接入技术切换到 Non-3GPP接入技术， 则 MME发 送更新位置请求（ Update Location Request )消息给 HSS( Home Subscriber Server, 家乡用户服务器；)， 请求 HSS删除此 PDN所对应的 APN ( Access Point Name , 接入点名 ) 的 PDN GW地址信息；
9、 HSS根据接收到的更新位置请求消息删除一个给定 APN的 PDN GW的 地址信息后， 向 MME回应更新位置响应 ( Update Location Response ) 消息； 但是， 需要注意的是， 当用户在 HSS 中的签约数据发生改变时， 特别是 UE当前正在使用的 APN被删除， 而 UE正在使用此 APN时， 则依照目前的方 法标准， UE无法发起 PDN连接的释放过程， 也即无法实现 PDN连接的释放， 为此需要新的解决方案。 发明内容
有鉴于此，本发明解决的问题是提供一种实现 PDN连接释放的方法、装置 和***， 能够当用户在 HSS中的签约数据发生改变时， 实现 PDN连接的释放。
为解决上述问题， 本发明提供的技术方案如下：
一种实现 PDN连接释放的方法， 包括以下步骤：
当用户在家乡用户服务器 HSS中的签约数据改变时， HSS通知移动性管理 实体 MME以触发分组数据网 PDN连接的释放；
MME根据所述 HSS的通知， 请求服务网关 Serving GW和分组数据网关
PDN GW删除所述 PDN连接下的所有承载；
然后 MME请求用户终端去激活所述 PDN连接的所有承载。
优选的， 所述 MME请求用户终端去激活所述 PDN连接的所有承载包括：
MME向基站发起删除所述 PDN连接下所有的无线接入承载请求， 同时向 用户终端发起去激活 PDN连接下所有承载请求；
基站根据该删除请求释放相应的无线接入承载；
用户终端根据该去激活请求删除相应的承载上下文后， 通过基站向 MME 返回响应。
优选的， MME通过基站向用户终端发送非接入层的去激活承载请求消息 来发起去激活承载请求； 所述的去激活承载请求消息以背包的方式包含在所述
MME向基站发起删除所述 PDN连接下所有的无线接入承载请求的 S1-MME接 口消息中；
基站通过向用户终端发送无线资源配置请求消息请求用户终端删除相应的 无线资源； 所述的去激活承载请求消息以背包的方式包含在所述无线资源配置 请求消息中；
用户终端通过向基站发送无线资源配置响应消息来返回响应； 用户终端通 过基站向 MME发送非接入层的去激活承载响应消息， 所述的去激活承载响应 ：'肖息以背包的方式包含在所述无线资源配置响应消息中；
所述基站通过向 MME发送 S1-MME接口响应消息来通知 MME已完成所 述 PDN连接下所有无线接入承载的删除；所述用户终端给 MME的非接入层的 去激活承载响应消息以背包的方式包含在所述基站给 MME发送的 S1-MME接 口响应消息中。
优选的， 所述 MME请求用户终端去激活所述 PDN的所有承载包括： 当 MME与 UE从空闲状态进入连接状态时， MME与用户终端完成演进分 组***承载上下文的同步；
在演进分组***承载上下文同步过程中， UE根据 MME的请求，删除相应 的所述 PDN连接下的所有承载上下文。
优选的， 该方法还包括以下步骤：
若用户终端的缺省接入点名被删除时， 用户终端发起 PDN连接请求消息； 所述请求消息中包含缺省接入点名指示标识。
优选的， 所述 HSS向用户终端的当前 MME发送***用户数据消息， 通知 该 MME所述用户在 HSS中的签约数据已发生改变。
优选的 ,所述 MME请求 Serving GW和 PDN GW删除所述 PDN连接下的 所有承载包括以下步骤：
MME发送删除承载请求消息给 Serving GW,请求删除所述 PDN连接下所 有承载；
Serving GW发送删除承载请求消息给 PDN GW, 请求删除此 PDN连接下 所有承载； PDN GW接收 Serving GW的请求消息 , 并在删除所述 PDN连接下所有承 载后， 向 Serving GW回应删除 7 载响应消息；
Serving GW收到 PDN GW的响应消息后向 MME回应删除 载响应消息 , 以通知 MME所述 Serving GW和 PDN GW已删除所述 PDN连接下所有承载。
一种家乡用户服务器 HSS, 包括： 存储单元和触发单元； 其中，
所述存储单元用于： 存储用户的签约数据， 并当用户的签约数据改变时通 知所述触发单元；
所述触发单元用于： 根据存储单元的通知触发 PDN连接的释放。
优选的， 所述触发单元进一步包括： 第一接收单元和第一发送单元； 其中， 所述第一接收单元用于： 接收所述存储单元的通知；
所述第一发送单元用于： 根据第一接收单元接收到的通知， 向用户终端的 当前 MME发送***用户数据消息， 以触发 PDN连接的释放。
一种移动性管理实体 MME, 包括： 第一请求单元和第二请求单元； 其中， 所述第一请求单元用于： 根据 HSS发送的 PDN连接释放触发通知， 请求 服务网关和分组数据网关删除所述 PDN连接下的所有承载，并在所述服务网关 和分组数据网关完成请求操作后通知所述第二请求单元；
所述第二请求单元用于： 根据所述第一请求单元的通知， 请求用户终端去 激活所述 PDN连接下的所有承载及请求基站删除所述 PDN连接下的所有无线 接入承载。
优选的， 所述第二请求单元进一步包括： 第二发送单元和第二接收单元； 其中，所述第二发送单元用于： 向基站发送删除所述 PDN连接下所有无线接入 承载的请求， 以通知基站释放相应的无线接入承载； 同时向用户终端发送去激 活 PDN连接下所有承载请求， 以通知用户终端删除所述 PDN连接下所有的承 载；
所述第二接收单元用于：接收基站删除所述 PDN连接下所有无线接入承载 后的响应及用户终端删除所述 PDN连接下所有的承载后通过基站返回的响应。
一种实现 PDN连接释放的***， 该***包括上述任意一项所述的 HSS和 上述任意一项所述的 MME。
可以看出， 釆用本发明的方法、 装置和***， 通过 HSS来触发 PDN连接 的释放过程，解决了用户的签约数据改变时 UE无法发起 PDN连接的释放过程 之问题；此外，也同时解决了当 UE的 Default APN被删除时，重新建立 Default APN连接的问题； 并且对于现有***的改动较小， 并增强了***功能。
图 1是现有技术中 UE发起的 PDN连接的释放过程示意图；
图 2是本发明实施例 1的方法流程示意图；
图 3是本发明实施例 2由 HSS触发的 PDN连接释放过程示意图； 图 4是本发明实施例 3由 HSS触发的 PDN连接释放过程示意图； 图 5是本发明实施例 4的 HSS结构示意图；
图 6是本发明实施例 5的 MME结构示意图。
Figure imgf000007_0001
本发明的基本思想在于当用户在 HSS 中的签约数据发生改变时， 特别是 UE当前正在使用的 APN被删除时， HSS根据获知的被修改的用户的签约数据， 来触发 PDN连接的释放过程， 解决了用户的签约数据改变时无法发起 PDN连 接的释放过程之问题。
为了使本领域技术人员更好的理解本发明， 下面结合附图和具体实施例对 本发明的方法进行详细说明。
本发明实施例 1提供了一种实现 PDN连接释放的方法，如图 2所示，该方 法包括：
步骤 201：当用户在 HSS中的签约数据改变时 , HSS通知 MME以触发 PDN 连接的释放；
具体的， 当用户在 HSS中的签约数据发生改变时， 特别是 UE当前正在使 用的 APN被删除时， HSS 向 UE 的当前 MME发送***用户数据 （Insert Subscriber Data ) 消息， 通知该 MME所述用户在 HSS中的签约数据已发生改 变（例如， UE当前正在使用的 APN被删除）， 以此来触发 PDN连接的分离（释 放 )过程， 以解决在此种情况下现有方法中 UE无法发起 PDN连接释放过程的 问题； 其中， HSS还可以通过其他方式来通知 MME所述用户的签约数据已发生 改变， 以此来触发 PDN连接的分离， 本文不再赘述。
步骤 202: MME根据所述 HSS的通知消息 ,请求 Serving GW和 PDN GW 删除所述 PDN连接下的所有承载；
当 MME接收到 HSS的通知（例如***用户数据信息 )后， 发现 UE当前 正在使用的一个 APN被签约数据删除， 则 MME发送删除承载请求（Delete Bearer Request ) ( TEID, LBI )消息给 Serving GW, 请求删除此 PDN连接下所 有的 EPS承载； Serving GW根据 MME的请求发送删除承载请求（ Delete Bearer Request ) ( TEID, LBI )消息给 PDN GW, 请求删除此 PDN连接下所有的 EPS 承载； 而 PDN GW接收 Serving GW的请求， 并在删除所述 PDN连接下所有的 EPS承载后， 向 Serving GW回应删除 载响应（ Delete Bearer Response )消息， 而 Serving GW收到响应消息后向 MME回应该删除 7 载响应消息 ,以通知 MME 所述 Serving GW和 PDN GW已删除所述 PDN连接下所有的 EPS承载； 其中， 当 PCRF被应用到这个 PDN网络时， PDN GW会与 PCRF进行交互， 以指示 释放所述 EPS承载；
需要注意到是， 本领域技术人员理解： 上述信息交互过程中请求删除承载 请求和删除承载响应不仅局限于所述的删除承载请求消息和删除承载响应消 息， 也可以通过其他方式或消息来实现， 本文不再赘述。
步骤 203： 然后 MME请求用户终端去激活所述 PDN连接的所有承载及请 求 eNodeB删除所述 PDN连接下所有承载所对应的无线接入承载；
具体的 ,在本实施例中 MME请求用户终端去激活所述 PDN连接的所有承 载及请求 eNodeB删除所述 PDN连接下所有承载所对应的无线接入承载包括但 并不局限于下述两种情况：
1 )、 若 UE与 MME之间有 NAS ( Non- Access Stratum, 非接入层 )信令连 接， 则 MME首先向 eNodeB发起删除此 PDN连接下所有承载所对应的无线接 入承载的请求消息， 同时， MME向 UE发起去激活 PDN连接下所有承载请求； 具体的 , MME向 eNodeB发起删除此 PDN连接下所有承载所对应的无线接入 7 载的请求消息可通过 SAE ( System Architecture Evolution, ***架构演进 ) ^ 载删除命令 ( SAE Bearer Release Command ) 消息来实现， MME通过 eNodeB 向 UE发送 NAS的去激活承载请求 ( Deactive Bearer Request )消息来发起去激 活承载请求，其中， Deactive Bearer Request消息是包含在 SI -MME接口的所述 SAE Bearer Release Command消息中， 即是通过背包（ piggyback ) 的方式将去 激活承载请求传递给 UE; 这里是以这两个消息来给出实现方法， 当然也可以 通过其他消息来实现， 本实施例并不局限于此；
eNodeB收到 MME发送的删除无线接入承载请求消息后，向 UE发送 RRC ( Radio Resource Configuration, 无线资源配置） 消息， 请求 UE删除相应的无 线资源， 同时这个消息以背包（ piggyback ) 的方式包含 MME向 UE发送的去 激活承载请求 ( Deactivate Bearer Request ) 消息。
UE根据 eNodeB的请求删除相应的承载上下文后， 向 eNodeB回应 RRC 无线资源配置响应 （ Radio Resource Configuration Response ) 消息， 同时 UE根 据 eNodeB 以背包方式传递过来的 MME 发送给 UE 的去激活承载请求 ( Deactivate Bearer Request )删除此 PDN连接下的所有承载， 然后向 MME回 应去激活承载回应 ( Deactivate Bearer Response ) 消息。 这个 Radio Resource Configuration Response消息以背包（ piggyback ) 的方式包含这个 UE给 MME 的 NAS去激活 载响应 ( Deactivate Bearer Response ) 消息；
eNodeB根据 UE返回的响应消息，向 MME发送 SAE承载删除完成（ SAE Bearer Release Complete ) 消息， 通知 MME已完成所述 PDN连接下所有 EPS 承载的删除； 同时这个消息以背包（piggyback ) 的方式包含 UE的去激活承载 响应 ( Deactivate Bearer Response ) 消息；
2 )、 若 UE与 MME之间没有建立 NAS ( Non-Access Stratum, 非接入层 ) 信令连接， 则 MME不能直接向 eNodeB发起去激活此 PDN连接下所有承载的 请求消息， 而是当 UE从空闲状态进入连接状态时， UE与 MME进行演进分组 ***承载上下文（ EPS Bearer Context ) 的同步（该同步过程可釆用现有技术中 的方式来实现， 本文不再赘述）； 在承载上下文的同步过程中， UE根据 MME 的指示， 删除相应的所述请求去激活 PDN的所有的 EPS承载（ EPS Bearer ), 并在完成删除后通知 MME。
需要注意的是， 上述实施例中若被删除的 APN是 UE的 Default APN, 则 在完成 PDN连接的去激活过程之后， 即所述 PDN连接下所有的 EPS承载被删 除了之后 , 当 UE发现其 Default APN所对应的所有 EPS承载已被删除 , 并且 UE还使用其它的 PDN连接时 , 则 UE发起 UE Requested PDN Connectivity过 程， 此过程在标准 TS23.401v8.2.0的章节 5.10.2中已有定义， 本文不再赘述; 其中，在 UE发送的 PDN Connectivity Request消息中使用缺省 APN指示（ Default APN Indicator )标识， 以指示 MME建立 Default APN的 EPS Bearer; 以此解决 了当 UE的 Default APN被删除时 , 重新建立 Default APN连接的问题。
此外， 上述实施例中传递请求或响应的各种消息格式， 只是在优选的方案 中使用的方式， 但并不局限于此， 本领域技术人员容易理解还可以通过其他消 息格式或方式来传递请求或响应， 此处不再赘述。
下面以上述实施例的方法步骤在***中的具体实现为例， 对上述实施例的 方法进行伴细说明：
本发明实施例 2, 如图 3所示， UE与 MME之间有 NAS信令连接时， HSS 触发的 PDN连接释放过程包括以下步骤：
S301 : HSS向 UE的当前 MME发送 Insert Subscriber Data消息。
S302: MME根据所述 HSS发送的消息获知 UE正在使用的一个 APN被签 约数据删除， 然后发送 Delete Bearer Request ( TEID, LBI )消息给 Serving GW, 请求删除此 PDN连接下所有的 EPS承载；
S303: Serving GW发送 Delete Bearer Request! TEID, LBI )消息给 PDN GW, 请求删除此 PDN连接下所有的 EPS承载；
S304: PDN GW删除了所述 PDN连接下所有 EPS承载后， 向 Serving GW 回应 Delete Bearer Response消息；
S305: PDN GW与 PCRF进行交互， 以指示 EPS承载被释放；
S306: Serving GW向 MME回应 Delete Bearer Response消息；
S307: MME向 eNodeB发送 SAE Bearer Release Command消息， 发起删 除此 PDN的所有无线接入承载请求， 同时 MME向 UE发送去激活承载请求 ( Deactivate Bearer Request ) 消息； 此 SAE Bearer Release Command消息以背 包 ( iggyback ) 方式包含所述的 Deactivate Bearer Request消息；
S308: eNodeB向 UE发送 Radio Resource Configuration请求消息， 请求 UE删除相应的无线资源，同时该请求消息以背包（ piggyback )的方式包含 MME 向 UE发送的 Deactivate Bearer Request消息；
S309: UE删除了相应的 7 载及无线 7 载后，向 eNodeB回应 Radio Resource Configuration Response消息及向 MME回应 Deactivate Bearer Response消息； 其中, 该 Radio Resource Configuration Response响应消息以背包 ( iggyback )
S310: eNodeB接收到 UE发送的 Radio Resource Configuration Response消 息， 释放相应的无线承载与接入承载后， 向 MME发送 S1-MME接口的 SAE Bearer Release Complete消息； 同时， 该消息以背包（ piggyback ) 的方式包含 UE发送给 MME的 Deactivate Bearer Response消息； 完成 PDN连接的释放过 程。
本发明实施例 3 , 如图 4所示， UE在空闲状态时， HSS触发的 PDN连接 释放过程包括以下步骤：
S401 : HSS向 UE的当前 MME发送 Insert Subscriber Data消息。
S402: MME根据所述 HSS发送的消息获知 UE使用的一个 APN被签约数 据删除， 然后发送 Delete Bearer Request ( TEID, LBI )消息给 Serving GW, 请 求删除此 PDN连接下所有的 EPS承载；
S403: Serving GW发送 Delete Bearer Request! TEID, LBI )消息给 PDN GW, 请求删除此 PDN连接下所有的 EPS承载；
S404: PDN GW删除了所述 PDN连接下所有 EPS承载后， 向 Serving GW 回应 Delete Bearer Response消息；
S405 PDN GW与 PCRF进行交互， 以指示 EPS承载被释放；
S406 Serving GW向 MME回应 Delete Bearer Response消息；
S407 因 UE处于空闲状态，没有建立与 MME之间的信令连接 ,此时 MME 不能直接向 eNodeB与 UE发送消息。 而是当 UE从空闲状态进入连接状态时， UE与 MME建立了信令连接，此时执行 UE与 MME之间的 EPS Bearer Context 的同步（该同步过程可釆用现有技术中的方式来实现， 本文不再赘述）； 在承载 上下文的同步过程中， UE根据 MME的指示，删除相应的所述请求去激活 PDN 连接的所有的 EPS承载（ EPS Bearer ), 并在完成删除后通知 MME。
在上述实施例 2和 3中， Serving GW与 PDN GW之间的 S5/S8接口 于 GTP协议 ( GPRS Tunneling Protocol, GPRS通用分组无线业务隧道协议 ), 如果 S5/S8接口使用 PMIP ( Proxy Mobile IP, 代理移动 IP )协议， 则图中标识 为 （A )所对应的步骤可釆用标准 TS23.402中定义步骤实现， 本文不再赘述。
可以看出， 釆用本发明的方法， 通过 HSS来触发 PDN连接的释放过程， 解决了用户的签约数据改变时 UE无法发起 PDN连接的释放过程之问题，同时 也解决了当 UE的 Default APN被网络删除时， 重新建立 Default APN连接的问 题； 并且对于现有***的改动较小， 并提高了***的性能， 同时也节省了*** 的开销。
基于上述思想，本发明实施例 4又提出了一种家乡用户服务器 HSS, 包括： 存储单元 501和触发单元 502; 其中，
所述存储单元 501用于： 存储用户的签约数据， 并当用户的签约数据改变 时通知所述触发单元 502;
所述触发单元 502用于： 根据存储单元 501的通知触发 PDN连接的释放。 其中， 所述触发单元 502进一步包括： 第一接收单元和第一发送单元； 所 述第一接收单元用于： 接收所述存储单元的通知； 所述第一发送单元用于： 根 据第一接收单元接收到的通知， 向用户终端的当前 MME发送***用户数据消 息， 以触发 PDN连接的释放。
此外， 本发明实施例 5还提出了一种移动性管理实体 MME, 包括： 第一 请求单元 601和第二请求单元 602; 其中，
所述第一请求单元 601用于： 根据 HSS发送的 PDN连接释放触发通知， 请求服务网关和分组数据网关删除所述 PDN连接下的所有承载，并在所述服务 网关和分组数据网关完成请求操作后通知所述第二请求单元 602;
所述第二请求单元 602用于： 根据所述第一请求单元 601的通知， 请求用 户终端去激活所述 PDN连接下的所有承载及请求基站删除所述 PDN连接下的 所有无线接入承载。
其中， 所述第二请求单元进一步包括： 第二发送单元和第二接收单元； 所 述第二发送单元用于：向基站发送删除所述 PDN连接下所有无线接入承载的请 求，以通知基站释放相应的无线接入承载； 并向用户终端发送去激活 PDN连接 下所有承载请求， 以通知用户终端删除所述 PDN连接下所有的承载； 所述第二 接收单元用于：接收基站删除所述 PDN连接下所有无线接入承载后的响应及用 户终端删除所述 PDN连接下所有的承载后通过基站返回的响应。
需要注意的是， 上述实施例所述的装置通常是在演进分组***中完成其相 应的功能， 因此包含本发明实施例所述的装置的演进分组***也应包含在本发 明的保护范围之内， 具体本文不再赘述。
本领域技术人员可以理解， 可以使用许多不同的工艺和技术中的任意一种 来表示信息、 消息和信号。 例如， 上述说明中提到过的消息、 信息都可以表示 为电压、 电流、 电磁波、 磁场或磁性粒子、 光场或以上任意组合。
专业人员还可以进一步应能意识到， 结合本文中所公开的实施例描述的各 示例的单元及算法步骤， 能够以电子硬件、计算机软件或者二者的结合来实现， 为了清楚地说明硬件和软件的可互换性， 在上述说明中已经按照功能一般性地 描述了各示例的组成及步骤。 这些功能究竟以硬件还是软件方式来执行， 取决 于技术方案的特定应用和设计约束条件。 专业技术人员可以对每个特定的应用 来使用不同方法来实现所描述的功能， 但是这种实现不应认为超出本发明的范 围。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、 处 理器执行的软件模块， 或者二者的结合来实施。 软件模块可以置于随机存储器 ( RAM ), 内存、只读存储器（ROM )、 电可编程 ROM、 电可擦除可编程 ROM、 寄存器、 硬盘、 可移动磁盘、 CD-ROM、 或技术领域内所公知的任意其它形式 的存储介质中。
对所公开的实施例的上述说明， 使本领域专业技术人员能够实现或使用本 发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的， 本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下， 在其它 实施例中实现。 因此， 本发明将不会被限制于本文所示的这些实施例， 而是要 符合与本文所公开的原理和新颖特点相一致的最宽的范围。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内， 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。
以上所述的本发明实施方式， 并不构成对本发明保护范围的限定。 任何在 本发明的精神和原则之内所作的修改、 等同替换和改进等， 均应包含在本发明 的权利要求保护范围之内。

Claims

权利要求书
1、 一种实现 PDN连接释放的方法， 其特征在于， 包括以下步骤： 当用户在家乡用户服务器 HSS中的签约数据改变时， HSS通知移动性管理 实体 MME以触发分组数据网 PDN连接的释放；
MME根据所述 HSS的通知， 请求服务网关 Serving GW和分组数据网关 PDN GW删除所述 PDN连接下的所有承载；
然后 MME请求用户终端去激活所述 PDN连接的所有承载。
2、根据权利要求 1所述的方法， 其特征在于， 所述 MME请求用户终端去 激活所述 PDN连接的所有承载包括：
MME向基站发起删除所述 PDN连接下所有的无线接入承载请求， 同时向 用户终端发起去激活 PDN连接下所有承载请求；
基站根据该删除请求释放相应的无线接入承载；
用户终端根据该去激活请求删除相应的承载上下文后， 通过基站向 MME 返回响应。
3、 根据权利要求 2所述的方法， 其特征在于：
MME通过基站向用户终端发送非接入层的去激活承载请求消息来发起去 激活承载请求； 所述的去激活承载请求消息以背包的方式包含在所述 MME向 基站发起删除所述 PDN连接下所有的无线接入承载请求的 S1-MME接口消息 中；
基站通过向用户终端发送无线资源配置请求消息请求用户终端删除相应的 无线资源； 所述的去激活承载请求消息以背包的方式包含在所述无线资源配置 请求消息中；
用户终端通过向基站发送无线资源配置响应消息来返回响应； 用户终端通 过基站向 MME发送非接入层的去激活承载响应消息， 所述的去激活承载响应 消息以背包的方式包含在所述无线资源配置响应消息中；
所述基站通过向 MME发送 S1-MME接口响应消息来通知 MME已完成所 述 PDN连接下所有无线接入承载的删除；所述用户终端给 MME的非接入层的 去激活承载响应消息以背包的方式包含在所述基站给 MME发送的 S1-MME接 口响应消息中。
4、 根据权利要求 1所述的方法， 其特征在于， 所述 MME请求用户终端去 激活所述 PDN的所有承载包括：
当 MME与 UE从空闲状态进入连接状态时， MME与用户终端完成演进分 组***承载上下文的同步；
在演进分组***承载上下文同步过程中， UE根据 MME的请求，删除相应 的所述 PDN连接下的所有承载上下文。
5、根据权利要求 1至 4任意一项所述的方法， 其特征在于， 该方法还包括 以下步骤：
若用户终端的缺省接入点名被删除时， 用户终端发起 PDN连接请求消息； 所述请求消息中包含缺省接入点名指示标识。
6、 根据权利要求 1至 4任意一项所述的方法， 其特征在于：
所述 HSS向用户终端的当前 MME发送***用户数据消息 , 通知该 MME 所述用户在 HSS中的签约数据已发生改变。
7、 根据权利要求 1至 4任意一项所述的方法， 其特征在于， 所述 MME请 求 Serving GW和 PDN GW删除所述 PDN连接下的所有承载包括以下步骤：
MME发送删除承载请求消息给 Serving GW,请求删除所述 PDN连接下所 有承载；
Serving GW发送删除承载请求消息给 PDN GW, 请求删除此 PDN连接下 所有承载；
PDN GW接收 Serving GW的请求消息， 并在删除所述 PDN连接下所有承 载后， 向 Serving GW回应删除承载响应消息；
Serving GW收到 PDN GW的响应消息后向 MME回应删除 载响应消息， 以通知 MME所述 Serving GW和 PDN GW已删除所述 PDN连接下所有承载。
8、 一种家乡用户服务器 HSS, 其特征在于， 包括： 存储单元和触发单元； 其中，
所述存储单元用于： 存储用户的签约数据， 并当用户的签约数据改变时通 知所述触发单元；
所述触发单元用于： 根据存储单元的通知触发 PDN连接的释放。
9、 根据权利要求 8所述的 HSS, 其特征在于， 所述触发单元进一步包括： 第一接收单元和第一发送单元； 其中，
所述第一接收单元用于： 接收所述存储单元的通知；
所述第一发送单元用于： 根据第一接收单元接收到的通知， 向用户终端的 当前 MME发送***用户数据消息， 以触发 PDN连接的释放。
10、 一种移动性管理实体 MME, 其特征在于， 包括： 第一请求单元和第 二请求单元； 其中，
所述第一请求单元用于： 根据 HSS发送的 PDN连接释放触发通知， 请求 服务网关和分组数据网关删除所述 PDN连接下的所有承载，并在所述服务网关 和分组数据网关完成请求操作后通知所述第二请求单元；
所述第二请求单元用于： 根据所述第一请求单元的通知， 请求用户终端去 激活所述 PDN连接下的所有承载及请求基站删除所述 PDN连接下的所有无线 接入承载。
11、 根据权利要求 10所述的 MME, 其特征在于， 所述第二请求单元进一 步包括： 第二发送单元和第二接收单元； 其中，
所述第二发送单元用于：向基站发送删除所述 PDN连接下所有无线接入承 载的请求， 以通知基站释放相应的无线接入承载； 同时向用户终端发送去激活 PDN连接下所有承载请求， 以通知用户终端删除所述 PDN连接下所有的承载； 所述第二接收单元用于：接收基站删除所述 PDN连接下所有无线接入承载 后的响应及用户终端删除所述 PDN连接下所有的承载后通过基站返回的响应。
12、一种实现 PDN连接释放的***， 其特征在于： 该***包括如权利要求 8至 9任意一项所述的 HSS和如权利要求 10至 11任意一项所述的 MME。
PCT/CN2009/072358 2008-06-20 2009-06-19 实现pdn连接释放的方法、装置和*** WO2009152779A1 (zh)

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