WO2011035671A1 - System and method for releasing local internet protocol (ip) access connection - Google Patents

Abstract

A method for releasing local IP access connection includes that: when a local gateway is integrated with a wireless side network element, if the local gateway monitors that a local IP access connection of a user needs to be released, the local gateway or the wireless side network element informs a Mobility Management Element (MME) to release the local IP access connection of the user via an interface between the wireless side network element and the MME; after receiving the information, the MME releases all information associated with the local IP access connection of the user. A system and a network device for releasing local IP access connection are also disclosed in the present invention. The present invention can realize to release local IP access connection in the case that a local gateway is integrated with a wireless side network element or a Home Base Station gateway, and the interfaces of S5, S11 and Gn are not provided。

Description

 System and method for releasing local IP access connection

TECHNICAL FIELD The present invention relates to the field of mobile communications, and in particular, to a system and method for releasing a local IP access connection.

BACKGROUND OF THE INVENTION The 3rd Generation Partnership Project (3GPP) evolved Evolved Packet System (EPS) consists of an evolved universal mobile communication system (Evolved Universal Terrestrial Radio Access Network, E- UTRAN), Mobility Management Entity (MME), Serving Gateway (S-GW), Packet Data Network Gateway (P-GW or PDN GW), Home Subscriber Server (Home Subscriber Server) , HSS), 3GPP certification authorized charging 4 _{(authentication ¾ Authorization and accounting, AAA} ) May good works, a policy and charging rules function (policy and charging rules function, PCRF ) entity and other supporting nodes. FIG. 1a is a schematic diagram of an EPS system architecture according to the related art, where a mobility management entity (Mobility Management Element) is responsible for control planes such as mobility management, processing of non-access stratum signaling, and management of user mobility management context; - GW is an access gateway device connected to E-UTRAN, which forwards data between E-UTRAN and P-GW, and is responsible for buffering paging waiting data; P-GW is EPS and packet data network (Packet Data) Network, referred to as PDN, is the border gateway responsible for PDN access and forwarding data between EPS and PDN. Both S-GW and P-GW belong to the core network gateway. The home base station is a small, low-power base station deployed in indoor places such as homes and offices. The main purpose is to provide users with higher service rates and lower the cost of using high-speed services, while making up for existing distributed Insufficient coverage of cellular wireless communication systems. The advantages of home base stations are affordability, convenience, low power output, and plug and play. In the home base station system, the home base station is a wireless side network element, and the home base station can be directly connected to the core network. As shown in FIG. 1 , the home base station gateway can also access the core network through the logical network element, as shown in FIG. 2 and FIG. 3, where, The main functions of the home base station gateway are: verifying the security of the home base station, handling the registration of the home base station, performing operation and maintenance management on the home base station, configuring and controlling the home base station according to the operator's requirements, and exchanging data of the core network and the home base station. In addition to supporting access to the mobile core network, mobile communication systems (including home base station systems) can also support local IP access functions, which can be achieved under the condition that the wireless side network element has local IP access capability and the user subscribes to allow local IP access. The local access of the terminal to other IP devices or the Internet of the home network. The implementation of the local IP access can use the following connection establishment mode: by adding a local gateway to provide strong support for the local IP access technology, the local gateway can be combined with the wireless side network element (as shown in Figure 1). When there is a home base station gateway, the local gateway can be not only combined with the home base station (as shown in FIG. 2), but also can be combined with the home base station gateway (as shown in FIG. 3). In addition, the home base station gateway can be combined with the home base station. For the E-UTRAN system, the local gateway may be a local SGW (Local SGW, L-SGW) and a local PGW (Local PGW, L-PGW), or may be a separate L-PGW, an external local gateway (Local GW) , L-GW), can also be a data offload function entity. For a Universal Terrestrial Radio Access Network (UTRAN) system, the core network gateway may be a Serving GPRS Support Node (SGSN) or a Gateway GPRS Support Node (Gateway GPRS Support Node, GGSN); The local gateway may be a local GGSN (Local GGSN, L-GGSN) and a local SGSN (Local SGSN, L-SGSN), or may be a separate L-GGSN, an external local gateway (L-GW, Local GW) It can also be a data offload function entity. Taking the Long Term Evolution (LTE) mobile communication network architecture as an example, FIG. 4 shows a schematic data flow of local IP access and core network connection in a wireless communication system. In the architecture used by the present invention, since the local gateway (L-SGW, L-PGW, L-GGSN, L-GW, and data offload function entity) is combined with the radio side network element/home base station gateway, there is no S5, S11 and Gn interface. An internal interface exists between the local gateway and the radio side network element/home base station gateway, and the interface between the local mobility element (MME and SGSN) directly uses the wireless side network element/home base station gateway and the mobility management entity. Sl/Iu interface. That is, both the local gateway and the radio side network element/home base station gateway are connected to the mobility management entity through the Sl/Iu interface. In the prior art, when the P-GW in the LTE system determines that the user's bearer needs to be released according to the policy, the S-GW is notified through the S5 interface (the interface between the P-GW and the S-GW), and then The S-GW notifies the MME through the SI 1 interface (the interface between the S-GW and the MME). When the GGSN determines that the bearer of the user needs to be released according to the policy, the SGSN notifies the SGSN through the Gn interface (the interface directly between the GGSN and the SGSN). . In the case that the local gateway is connected with the wireless side network element/home base station gateway, the S5, Sl1, and Gn interfaces no longer exist, so the above release process cannot be implemented.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a system and method for releasing a local IP access connection, which solves the problem of setting up a local gateway with a wireless side network element/home base station gateway, and does not provide an S5, Sl, and Gn interface. In the case where the local gateway needs to release the local IP access connection. In order to solve the above problems, the present invention provides a method for releasing a local IP access connection, including:

After receiving the notification, the mobility management entity releases all information related to the local IP access connection of the user; or, when the local gateway is combined with the home base station gateway, if the local gateway detects that the local IP access connection of the user needs to be released And the local gateway or the home base station gateway notifies the mobility management entity to release the local IP access connection of the user by using an interface between the home base station gateway and the mobility management entity, where the mobility management entity receives the notification All information related to the user's local IP access connection is released.

When the local gateway is combined with the wireless side network element, the local gateway or the wireless side network element notifies the mobility management entity to release the local IP access connection of the user by adding an indication of releasing the local IP access connection in the sent interface message. Or add a message to release the user's local IP access connection. When the local gateway is combined with the home base station gateway, the local gateway or the home base station gateway notifies the mobility management entity to release the local IP access connection of the user by adding an indication of releasing the local IP access connection in the sent interface message; or new Increase the release of the user's local IP access connection

If the user is in an idle state, and the step of notifying the mobility management entity to release the local IP access connection of the user, the method further includes: the local gateway initiating a paging procedure to release the local IP access connection of the terminal After the step of releasing the all information related to the local IP access connection of the user, the method further includes: the mobility management entity initiating a paging procedure to release the locality of the terminal The bearer resource of the IP access connection; the method further includes: the mobility management entity, before the step of releasing, by the mobility management entity, all information related to the local IP access connection of the user The bearer deactivation process is initiated to the radio side network element, and the radio side network element initiates release of the radio resource control connection to the terminal to release the air interface resource and the bearer resource of the local IP access connection of the terminal. When the local gateway is configured with the wireless side network element, the step of the wireless side network element notifying the mobility management entity to release the local IP access connection of the user includes: determining, by the local network gateway, whether the local network element needs to be released according to the indication of the local gateway The local IP access connection of the user, when the local IP access connection of the user needs to be released, the wireless side network element notifies the mobility management entity to release the local IP access connection of the user; when the local gateway is connected with the home base station gateway The step of the home base station gateway notifying the mobility management entity to release the local IP access connection of the user includes: determining, by the indication of the local gateway, whether the user needs to release the local IP access connection of the user, when the user needs to release the When the user's local IP accesses the connection, the home base station gateway notifies the mobility management entity to release the user's local IP access connection. When the local gateway is combined with the wireless side network element, the local gateway determines the interface message carrying the indication of releasing the local IP access connection according to the indication of the wireless side network element; when the local gateway is connected with the home base station gateway, the local gateway is configured according to the local gateway The indication of the home base station gateway determines an interface message carrying an indication to release the local IP access connection. In order to solve the above problem, the present invention further provides a system for releasing a local IP access connection, including a local gateway, a wireless side network element, and a mobility management entity; wherein: the local gateway is combined with a wireless side network element; The local gateway or the wireless side network element is configured to: when the local gateway detects that the local IP access connection of the user needs to be released, notify the mobility management entity to release the local user by using the interface between the wireless side network element and the mobility management entity. IP access connection; the mobility management entity is configured to: release all information related to the local IP access connection of the user after receiving the notification. The local gateway or the radio side network element is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the radio side network element adds a release local IP access connection information in the sent interface message. . ⁵ ' , ' - ' , , . If the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging process to release the bearer resource of the local IP access connection of the terminal; if the user is in the connected state, The mobility management entity is further configured to: initiate a bearer deactivation process to the radio side network element, where the radio side network element is further configured to initiate a radio resource control connection release to the terminal, to release the air interface resource and the local IP access connection of the terminal. Host resources. In order to solve the above problem, the present invention further provides a network device, where the network device is provided with a local gateway and a wireless side network element, and the network device is configured to: when the local gateway detects that the local IP access connection of the user needs to be released And the local gateway or the wireless side network element notifies the mobility management entity to release the local IP access connection of the user by using an interface between the wireless side network element and the mobility management entity, so that the mobility management entity receives the Release all information related to the user's local IP access connection after notification. The network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the wireless side network element adding a release local IP access connection in the sent interface message Interest. ⁵ ' , ' - ' , , . In order to solve the above problem, the present invention further provides a system for releasing a local IP access connection, including a local gateway, a home base station gateway, and a mobility management entity; wherein: the local gateway is connected with a home base station gateway; The local gateway or the home base station gateway is set to: when the local gateway detects that the local IP access connection of the user needs to be released, the interface between the home base station gateway and the mobility management entity is notified.

The mobility management entity is configured to release all information related to the local IP access connection of the user after receiving the notification. The local gateway or the home base station gateway is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the home base station gateway adding an indication of releasing the local IP access connection in the sent interface message; Or add a message that informs the mobility management entity to release the user's local IP access connection. The system further includes a wireless side network element; if the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging process to release the bearer resource of the local IP access connection of the terminal; The user is in a connected state, and the mobility management entity is further configured to: initiate a bearer deactivation process to the radio side network element; the radio side network element is configured to: initiate a radio resource control connection release to the terminal, to release the air interface resource and The bearer resource of the local IP access connection of the terminal. In order to solve the above problem, the present invention further provides a network device, where the network device is provided with a local gateway and a home base station gateway; the network device is configured to: when the local gateway detects that the local IP access connection of the user needs to be released, The local gateway or the home base station gateway notifies the mobility management entity to release the local IP access connection of the user through an interface between the home base station gateway and the mobility management entity, so that the mobility management entity releases the notification after receiving the notification The user's local IP accesses all information related to the connection. The network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the home base station gateway adding an indication of releasing the local IP access connection in the sent interface message; or adding one Notifying the mobility management entity to release the message of the user's local IP access connection. In summary, the present invention provides a system and method for releasing a local IP access connection, which can be implemented when a local gateway is connected with a wireless side network element or a home base station gateway, and the S5, Sl l, and Gn interfaces are not provided. , How to release the local IP access connection.

1 is a schematic diagram of a wireless communication network connection in the prior art; FIG. 2 is a schematic diagram of a wireless communication network connection in the prior art; FIG. 3 is a schematic diagram of a wireless communication network connection in the prior art; FIG. 5 is a flowchart of a local IP access connection for releasing a idle state terminal according to the present invention; FIG. 6 is a flowchart of releasing a local IP access connection of an idle state terminal according to the present invention; Figure 2 is a flow chart of the present invention for releasing a connection state terminal local IP access connection.

Preferred embodiment of the invention

In view of the above problems, the present invention provides a system and method for releasing a local IP access connection, which is notified by a local gateway through a wireless side network element/home base station gateway by adding a new Sl/Iu message or an extended Sl/Iu message. The mobility management entity releases the local IP access connection. All the embodiments in the present invention can be applied to the application scenarios of the LTE system and the UTRAN system. In the embodiment of the present invention, for the LTE system, the local gateway may be an L-SGW and an L-PGW, or may be a separate L-PGW, an external L-GW, or a data offload function entity. For UTRAN systems, the local gateway can be L-GGSN and L-SGSN, or it can be separate The L-GGSN and the external L-GW may also be data splitting functional entities, and the mobility management entity refers to an MME in an LTE system and an SGSN in a UTRAN system. In all the embodiments of the present invention, since the local gateway and the wireless side network element/home base station gateway are combined, the interface between the local gateway and the wireless side network element/home base station gateway is an internal interface, so the local gateway sends the local gateway. The message to the mobility management entity is the message sent by the radio side network element/home base station gateway to the mobility management entity through the Sl/Iu interface. System Embodiment Embodiment 1 This embodiment provides a system for releasing a local IP access connection, as shown in FIG. 1 , including a local gateway, a wireless side network element, and a mobility management entity. The system may further include a home base station gateway (eg, As shown in Figure 2, the local gateway is combined with the wireless side network element; the local gateway or the wireless side network element is set to: When the local gateway detects that the local IP access connection of the user needs to be released, the wireless side network element and the mobility management entity The interface between the mobile management entity is notified to release the user's local IP access connection; the mobility management entity is set to: release all information related to the user's local IP access connection after receiving the notification. The local gateway or the radio side network element notifies the mobility management entity to release the user's local IP access connection by: the local gateway or the radio side network element adds an indication of releasing the local IP access connection in the sent interface message; or adding a notification The mobility management entity releases the user's local IP access connection message, such as a local IP access connection release request message. If the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging process to release the bearer resource of the local IP access connection of the terminal; if the user is in the connected state, the mobility management entity is further configured to: The side network element initiates a bearer deactivation process, and the radio side network element is further configured to: initiate a radio resource control (RRC) connection release to the terminal to release the air interface resource and the bearer resource of the local IP access connection of the terminal. When there is a home base station gateway and the architecture shown in FIG. 2 is used, the message exchange between the local gateway or the wireless side network element and the mobility management entity needs to pass through the home base station gateway. The embodiment further provides a network device, where the network device is provided with a local gateway and a wireless side network element, and the network device is configured as: when the local gateway detects that the local IP access connection of the user needs to be released, the local gateway or the wireless side The network element notifies the mobility management entity to release the local IP access connection of the user by using an interface between the wireless side network element and the mobility management entity, so that the mobility management entity releases the local IP access of the user after receiving the notification. Connect all relevant information. The network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the wireless side network element adding a release local IP access connection information in the sent interface message. ⁵ ' , ' - ' , , . The second embodiment of the present invention provides a system for releasing a local IP access connection, as shown in FIG. 3, including a local gateway, a home base station gateway, a wireless side network element, and a mobility management entity; a local gateway and a home base station gateway. The local gateway or the home base station gateway is configured to: when the local gateway detects that the local IP access connection of the user needs to be released, notify the mobility management entity to release the local IP of the user through the interface between the home base station gateway and the mobility management entity. Access connection; The mobility management entity is set to: release all information related to the user's local IP access connection after receiving the notification. The local gateway or the home base station gateway notifies the mobility management entity to release the user's local IP access connection by: the local gateway or the home base station gateway adding an indication of releasing the local IP access connection in the sent interface message; or adding a notification mobility The management entity releases the message of the user's local IP access connection, such as a local IP access connection release request message. If the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging process to release the bearer resource of the local IP access connection of the terminal; if the user is in the connected state, the mobility management entity is further configured to: The side network element initiates a bearer deactivation process, and the radio side network element is further configured to: initiate an RRC connection release to the terminal, to release the air interface resource and the bearer resource of the local IP access connection of the terminal. In this embodiment, the message between the mobility management entity and the wireless side entity needs to be forwarded via the home base station gateway. In this embodiment, a network device is further provided, where the network device is provided with a local gateway and a home base station gateway; the network device is configured as: when the local gateway detects that the local IP access connection of the user needs to be released, the local gateway or The home base station gateway notifies the mobility management entity to release the local IP access connection of the user by using an interface between the home base station gateway and the mobility management entity, so that the mobility management entity releases the user after receiving the notification All information related to the local IP access connection. The network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the home base station gateway adding an indication of releasing the local IP access connection in the sent interface message; or adding one Notifying the mobility management entity to release the message of the user's local IP access connection. Method Embodiment FIG. 1 is a flowchart of a local gateway initiating a local IP access connection release. In this process, the terminal is in an idle state, and the mobility management entity initiates a paging process. The specific steps are as follows: Step 501: The terminal has a local IP access connection after accessing the wireless communication system, and may also have a core network connection. Step 502: The local gateway detects that the local IP access connection needs to be released. The local gateway may monitor the need to release the local according to a local policy or due to an abnormal situation. IP access connection. Step 503: When the local gateway is combined with the wireless side network element (such as the architecture shown in FIG. 1 or FIG. 2), the mobility management entity is notified to notify the mobility management entity to release the local IP access connection of the user; When the gateway is combined with the home base station gateway (as shown in FIG. 3), the local gateway or the home base station gateway sends a message to the mobility management entity through the interface between the home base station gateway and the mobility management entity to notify the mobility management. The entity releases the user's local IP access connection; in the E-UTRAN system (ie, the LTE system), the interface between the wireless side network element or the home base station gateway and the mobility management entity is an S1 interface, and in the UTRAN system, the wireless side network The interface between the meta or home base station gateway and the mobility management entity is the Iu interface. In this step, when the local gateway and the wireless side network element are combined, the local gateway or the wireless side network element adds an indication of releasing the local IP access connection in the sent interface message (ie, the Sl/Iu interface message); or adding one The mobile management entity is notified to release the user's local IP access connection message, such as a local IP access connection release request message. When the local gateway is connected with the home base station gateway, the local gateway or the home base station gateway adds an indication of releasing the local IP access connection in the sent interface message (ie, the Sl/Iu interface message); or adds a notification to the mobility management entity to release The user's local IP access connection message, the local IP access connection release request message. When there is a home base station gateway and the architecture shown in FIG. 2 is used, the message exchange between the local gateway or the wireless side network element and the mobility management entity needs to pass through the home base station gateway. When the architecture shown in Figure 3 is used, the message interaction between the wireless side network element and the mobility management entity needs to be forwarded by the home base station gateway. Further, the wireless side network element or the home base station gateway that is set up with the local gateway determines whether the local IP access connection of the user needs to be released according to the indication of the local gateway, and the indication may be an internal message sent or a set flag, etc.; or, local The gateway determines, according to an indication of the wireless side network element or the home base station gateway that is associated with the interface, an interface message carrying an indication of releasing the local IP access connection, and the indication may be an internal message sent or a set flag or the like. Step 504: After receiving the notification of releasing the local IP access connection of the user, the mobility management entity checks the user context and releases all information related to the local IP access connection of the user. interest. ^W , , . ' . , ' This step is an optional step, that is, the local gateway can consider that the request message sent in step 503 does not need to wait for the response of the mobility management entity, or can also consider that the subsequent paging process is the response of the request message in step 503. . Step 506: The mobility management entity discovers that the user is in an idle state, and initiates a paging process to release the bearer resource of the terminal's IP access connection. The terminal enters the connection state through the service request process. In the service request process, the mobility management entity does not instruct to reactivate the local IP access connection. After the service request process is completed, the terminal will release the bearer resources of its local IP access connection because the local IP access connection is not re-established. Step 507: When the user only has a local IP access connection, the mobility management entity triggers a user separation process. In this embodiment, the successful paging to the terminal is taken as an example. If the terminal is not paged, the mobility management entity still needs to release the information of the local IP access connection, that is, the mobility management entity needs to be released regardless of whether the terminal is successfully paged or not. If the local IP accesses the connection information, if the terminal is not paged, step 506 and step 507 are not executed. The second embodiment is shown in FIG. 6 as a flowchart for initiating a local IP access connection release by the local gateway. In this process, the terminal is in an idle state, and the local gateway initiates a paging optimization process. The specific steps are described as follows: Step 601: The terminal has a local IP access connection after accessing the wireless communication system, and may also have a core network connection. Step 602: The local gateway detects that the local IP access connection needs to be released. The local gateway may monitor the need to release the local according to a local policy or due to an abnormal situation.

IP access connection. Step 603: The local gateway checks the user context, and finds that the terminal is in an idle state, and then constructs In the paging message, the paging is optimized, and the terminal is locally paged, that is, only the base station is paged.

Step 604: The terminal that receives the paging message sends a service request message to the local gateway as a response. Step 605: When the local gateway is combined with the wireless side network element, the local gateway or the wireless side network element sends a message to the mobility management entity by using an interface between the wireless side network element and the mobility management entity to notify the mobility management entity. Release the user's local IP access connection; when the local gateway is connected with the home base station gateway, the local gateway or the home base station gateway sends a message to the mobility management entity through the interface between the home base station gateway and the mobility management entity to notify the mobility The management entity releases the user's local IP access connection; the mobility management entity may be notified in any of the following ways: Step 605a, the wireless side network element forwards the service request message in the Sl/Iu message (user initial message) To the mobility management entity; the wireless side network element or the home base station gateway that is set up with the local gateway includes the local IP access connection release indication in the Sl/Iu message according to the indication of the local gateway, and notifies the mobility management entity to release the local IP of the user. Accessing the connection; the indication refers to an indication of whether the local IP access connection needs to be released, the It may be a marker or other internal messages sent disposed. Alternatively, the local gateway that is set up with the wireless side network element/home base station gateway includes the local IP access connection release indication in the Sl/Iu message according to the indication of the wireless side network element/home base station gateway, and notifies the mobility management entity to release the local IP access connection. The indication refers to which Sl/Iu message may carry the local IP access connection indication information of the release user, and the indication may be an internal message sent or a set flag or the like. The S1 interface refers to an interface between a radio side network element or a home base station gateway and a mobility management entity in the E-UTRAN system, and the Iu interface refers to a radio side network element or a home base station gateway and a mobility management entity in the UTRAN system. between interface. When there is a home base station gateway and the architecture shown in FIG. 2 is used, the message exchange between the local gateway or the wireless side network element and the mobility management entity needs to pass through the home base station gateway. When the architecture shown in Figure 3 is used, the message interaction between the wireless side network element and the mobility management entity needs to be forwarded by the home base station gateway. Step 605b, when the local gateway is combined with the wireless side network element (such as the architecture shown in FIG. 1 or FIG. 2), the local gateway or the wireless side network element sends a new message through the Sl/Iu interface to notify the mobility management entity to release the user. Local IP access connection, when the local gateway is connected with the home base station gateway (as shown in Figure 3), the local gateway or home base station gateway sends a new message through the Sl/Iu interface to notify the mobility management entity to release the user's local IP access connection, the above new message may be a local IP access connection release request message; when there is a home base station gateway, and the architecture shown in FIG. 2 is used, between the local gateway or the wireless side network element and the mobility management entity Message interaction requires a home base station gateway. When the architecture shown in Figure 3 is used, the message interaction between the wireless side network element and the mobility management entity needs to be forwarded by the home base station gateway. Step 606: After receiving the notification of releasing the local IP access connection of the user, the mobility management entity checks the user context and releases all information related to the local IP access connection. Step 607: If the mobility management entity is notified by means of 605b, when the local gateway and the wireless access connection release the response message, when the local gateway is connected with the home base station gateway, the mobility management entity may also send the gateway to the local gateway or the home base station. Send a local IP access connection release response message. This step is an optional step, that is, the request notification sent in step 605b may be considered not to wait for a response from the mobility management entity, or the subsequent service request procedure may be considered as a response to the request message in step 605b. Step 608, proceeding to execute the service request process, in which the mobility management entity does not instruct to reactivate the local IP access connection. After the service request process is completed, the terminal will release the bearer resources of its local IP access connection because the local IP access connection is not re-established. Step 609: When the user only has a local IP access connection, the mobility management entity triggers a user separation process. In this embodiment, a successful paging to the terminal is taken as an example. If the terminal is not paged, that is, the service request in step 604 is not received, the local IP access connection needs to be released by performing steps 605b, 606, and 607, where In 605b, the local gateway needs to indicate that the mobility management entity terminal fails to page, and the mobility management entity no longer needs to initiate paging, and the corresponding service request processes of steps 608 and 609 are not performed. Execute again. The third embodiment is shown in FIG. 7 as a flowchart for initiating a local IP access connection release by the local gateway. In this process, the terminal is in a connected state. The specific steps are described as follows: Step 701: The terminal has a local IP access connection after accessing the wireless communication system, and may also have a core network connection. Step 702: The local gateway detects that the local IP access connection needs to be released. The local gateway may monitor that the local IP access connection needs to be released according to a local policy or due to an abnormal situation. Step 703: When the local gateway is combined with the wireless side network element (such as the architecture shown in FIG. 1 or FIG. 2), the information is sent to the mobility management entity to notify the mobility management entity to release the local IP access connection of the user; When the gateway is combined with the home base station gateway (as shown in FIG. 3), the local gateway or the home base station gateway sends a message to the mobility management entity through the interface between the home base station gateway and the mobility management entity to notify the mobility management. The entity releases the user's local IP access connection. In this step, when the local gateway and the wireless side network element are combined, the local gateway or the wireless side network element adds the local IP address in the sent interface message (ie, the Sl/Iu interface message). An indication of access to the connection; or a new message informing the mobility management entity to release the user's local IP access connection, such as a local IP access connection release request message. When the local gateway is connected with the home base station gateway, the local gateway or the home base station gateway adds an indication of releasing the local IP access connection in the sent interface message (ie, the Sl/Iu interface message); or adds a notification to the mobility management entity to release The user's local IP access connection message, the local IP access connection release request message. The S1 interface refers to the interface between the wireless side network element or the home base station gateway and the mobility management entity in the E-UTRAN system, and the Iu interface refers to the wireless side network element or the home base station gateway and the mobility management entity in the UTRAN system. Interface between. When there is a home base station gateway, when the architecture shown in FIG. 2 is used, the message exchange between the local gateway or the wireless side network element and the mobility management entity needs to pass through the home base station gateway.釆Use the one shown in Figure 3. In the architecture, the message interaction between the wireless side network element and the mobility management entity needs to be forwarded by the home base station gateway. Further, the wireless side network element or the home base station gateway that is set up with the local gateway determines whether the local IP access connection of the user needs to be released according to the indication of the local gateway, and the indication may be an internal message sent or a set flag, etc.; The indication of the wireless side network element or the home base station gateway associated therewith determines an interface message carrying an indication to release the local IP access connection, which may be an internal message sent or a set flag or the like. Step 704: When the local gateway is combined with the wireless side network element, the mobility management entity may further send a local IP access connection release response message to the local gateway or the wireless side network element, and when the local gateway and the home base station gateway are combined, move. The sexual management entity may also send a local IP access connection release response message to the local gateway or the home base station gateway. This step is an optional step, that is, the request message sent in step 703 does not need to wait for a response from the mobility management entity, or the subsequent bearer release process may be considered as a response to the request message in step 703. In step 705 and step 706, the mobility management entity finds that the user is in the connection state, initiates a bearer deactivation process, and the radio side network element initiates an RRC connection release to the terminal. The bearer resource of the connection is released by releasing the air interface resource and the local IP address of the terminal. Step 707: After receiving the notification of releasing the local IP access connection of the user, the mobility management entity checks the user context and releases all information related to the local IP access connection. This step can be performed at any time after step 703, and is not limited to this order. Step 708: When the user only has a local IP access connection, the mobility management entity triggers a user separation process. In the foregoing embodiments, when the local gateway is set up with the home base station gateway, the message between the mobility management entity and the wireless side entity is forwarded through the home base station gateway, and the message between the mobility management entity and the local gateway is no longer The home base station gateway needs to be forwarded, and the function extension of the wireless side network element in the process is also changed to the extension of the home base station gateway function. In these cases, the manner in which the local IP access connection mobility support is very similar to the above embodiment does not affect the description of the present invention. Therefore, the description will not be repeated here. The wireless side network element may be a base station, a home base station, or a radio network controller (RNC). The mobility management entity may be a Mobility Management Entity (MME), a Mobile Switching Centre (MSC), or a Serving GPRS Support Node (SGSN). The local gateway may be an L-SGW and an L-PGW, may be a separate L-PGW, may be an L-GGSN and an L-SGSN, and may be a separate L-GGSN. The local IP access connection can be local IP access to the user's local network, local IP access to the company's local network, local IP access to the Internet, Internet traffic shunting, and specific IP data offloading. The wireless side network element accessed by the local IP address can be the same as the local gateway address. The local IP access referred to in this document can refer to Local IP Access (LIPA), but is not limited to this specific unique title. Local IP access can also include one of the following: Local IP access to the user's local network, local IP access to the company's local network The local IP access to the Internet, the Internet, or the shunting operation of the company or home business, which will not be described below.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

Industrial Applicability The present invention can be implemented when a local gateway is connected with a wireless side network element or a home base station gateway, and is not provided.

In the case of the S5, Sl, and Gn interfaces, the local IP access connection is released.

Claims

Claim A method for releasing a local IP access connection, comprising: when a local gateway is combined with a wireless side network element, if the local gateway detects that the local IP access connection of the user needs to be released

After receiving the notification, the mobility management entity releases all information related to the local IP access connection of the user; or, when the local gateway is combined with the home base station gateway, if the local gateway detects that the local IP access connection of the user needs to be released And the local gateway or the home base station gateway notifies the mobility management entity to release the local IP access connection of the user by using an interface between the home base station gateway and the mobility management entity, where the mobility management entity receives the notification All information related to the user's local IP access connection is released. 2. The method according to claim 1, wherein the step of notifying the mobility management entity to release the local IP access connection of the user: when the local gateway is combined with the wireless side network element, the local gateway or the wireless side network element Notifying the mobility management entity to release the local IP access connection of the user by adding an indication of releasing the local IP access connection in the sent interface message; or adding a message releasing the local IP access connection of the user When the local gateway is combined with the home base station gateway, the local gateway or the home base station gateway notifies the mobility management entity to release the local IP access connection of the user by adding an indication of releasing the local IP access connection in the sent interface message; or new Increase the release of the user's local IP access connection 3. The method according to claim 1, wherein: if the user is in an idle state, and the step of notifying the mobility management entity to release the local IP access connection of the user, the method further includes: the local gateway initiating a paging procedure to release a bearer resource of the local IP access connection of the terminal; or, the mobility management entity releases the After the step of the user's local IP accessing all the information related to the connection, the method further includes: the mobility management entity initiating a paging process to release the bearer resource of the local IP access connection of the terminal; Before the step of releasing, by the mobility management entity, all information related to the local IP access connection of the user, the method further includes: the mobility management entity initiating a bearer deactivation process to the wireless side network element, where the wireless The side network element initiates a radio resource control connection release to the terminal to release the air interface resource and the bearer resource of the local IP access connection of the terminal. 4. The method of claim 1 wherein:  When the local gateway is configured with the wireless side network element, the step of the wireless side network element notifying the mobility management entity to release the local IP access connection of the user includes: determining, by the local network gateway, whether the local network element needs to be released according to the indication of the local gateway The local IP access connection of the user, when the local IP access connection of the user needs to be released, the wireless side network element notifies the mobility management entity to release the local IP access connection of the user;  When the local gateway is connected with the home base station gateway, the step of the home base station gateway notifying the mobility management entity to release the local IP access connection of the user includes: determining, by the indication of the local gateway, whether the user needs to be released according to the indication of the local gateway The local IP access connection, when the local IP access connection of the user needs to be released, the home base station gateway notifies the mobility management entity to release the local IP access connection of the user. 5. The method of claim 2, wherein:  When the local gateway is combined with the wireless side network element, the local gateway determines the interface message carrying the indication of releasing the local IP access connection according to the indication of the wireless side network element; when the local gateway is connected with the home base station gateway, the local gateway is configured according to the local gateway The indication of the home base station gateway determines an interface message carrying an indication to release the local IP access connection. A system for releasing a local IP access connection, comprising: a local gateway, a wireless side network element, and a mobility management entity; wherein: the local gateway is combined with the wireless side network element; The local gateway or the wireless side network element is configured to: when the local gateway detects that the local IP access connection of the user needs to be released, notify the mobility management entity to release the user by using an interface between the wireless side network element and the mobility management entity. Local IP access connection; the mobility management entity is configured to: release all information related to the local IP access connection of the user after receiving the notification. 7. The system according to claim 6, wherein: the local gateway or the wireless side network element is configured to notify the mobility management entity to release the local IP access connection of the user by: local gateway or wireless side network element Adding an indication to release the local IP access connection in the sent interface message; or adding a message informing the mobility management entity to release the user's local IP access connection. 8. The system according to claim 6, wherein: if the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging procedure to release the bearer resource of the local IP access connection of the terminal. If the user is in the connected state, the mobility management entity is further configured to: initiate a bearer deactivation process to the radio side network element, where the radio side network element is further configured to initiate a radio resource control connection release to the terminal to release The bearer resource of the air interface resource and the local IP access connection of the terminal. A network device, the network device is provided with a local gateway and a wireless side network element, and the network device is configured as: when the local gateway detects that the local IP access connection of the user needs to be released, the local gateway or the wireless side network element Notifying the mobility management entity to release the local IP access connection of the user by using an interface between the wireless side network element and the mobility management entity, so that the mobility management entity releases the local area of the user after receiving the notification All information related to IP access connections. 10. The network device of claim 9, wherein: The network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the wireless side network element adding a release local IP access connection information in the sent interface message. ⁵ ' , ' - ' , , . ' , ' 11. A system for releasing a local IP access connection, comprising a local gateway, a home base station gateway, and a mobility management entity; wherein:  The local gateway is connected to the home base station gateway; the local gateway or the home base station gateway is configured to: when the local gateway detects the local IP access connection that needs to release the user, the interface between the home base station gateway and the mobility management entity is Notice The mobility management entity is configured to release all information related to the local IP access connection of the user after receiving the notification. 12. The system of claim 11 wherein:  The local gateway or the home base station gateway is configured to notify the mobility management entity to release the local IP access connection of the user by: the local gateway or the home base station gateway adding an indication of releasing the local IP access connection in the sent interface message; Or add a message that informs the mobility management entity to release the user's local IP access connection. 13. The system of claim 11 wherein: The system further includes a wireless side network element; if the user is in an idle state, the mobility management entity or the local gateway is further configured to: initiate a paging process to release the bearer resource of the local IP access connection of the terminal; The user is in a connected state, and the mobility management entity is further configured to: initiate a bearer deactivation process to the radio side network element; the radio side network element is configured to: initiate a radio resource control connection to the terminal Released to release the air interface resources and the bearer resources of the local IP access connection of the terminal. A network device, the network device is provided with a local gateway and a home base station gateway; the network device is configured as: when the local gateway detects that the local IP access connection of the user needs to be released, the local gateway or the home base station gateway passes the home An interface between the base station gateway and the mobility management entity, notifying the mobility management entity to release the local IP access connection of the user, so that the mobility management entity releases the local IP access connection of the user after receiving the notification All relevant information. 15. The network device according to claim 14, wherein: the network device is configured to notify the mobility management entity to release the local IP access connection of the user by: the interface message sent by the local gateway or the home base station gateway Adding an indication to release the local IP access connection; or adding a message notifying the mobility management entity to release the user's local IP access connection.