WO2010124551A1

WO2010124551A1 - Method and system for preserving a packet data network gateway identifier in a multiple access scenario

Info

Publication number: WO2010124551A1
Application number: PCT/CN2010/071638
Authority: WO
Inventors: 毕以峰; 周晓云
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-04-30
Filing date: 2010-04-08
Publication date: 2010-11-04
Also published as: CN101730072A; CN101730072B

Abstract

Disclosed are a method and system for preserving a packet data network gateway (P-GW) identifier in a multiple access scenario, which include that: when a user equipment accesses to a packet data network via two access networks i.e. a first access network and a second network at the same time, and establishes connections to the same packet data network, a home subscriber server (HSS)/authentication, authorization and accounting (AAA) server stores a P-GW identifier; the first access network is a 3^rd generation partnership project (3GPP) access network, and the second access network is a non-3GPP access network; or the first access network is a non-3GPP access network, and the second access network is a 3GPP access network; when the access via one access network of the two access networks is released, the HSS/AAA server reserves the P-GW identifier. In the method, the HSS/AAA server can be notified reasonably and is commanded to store or delete the P-GW identifier correctly; thus ensuring the normal operation of the system when the P-GW identifier operation is involved in the multiple access scenario.

Description

Method and system for saving packet network network gateway identifier in multiple access scenario

The present invention relates to the field of communications, and in particular, to a method and system for saving a packet data network gateway identifier in a multi-access scenario in an Evolved Packet System (EPS). Background technique

The 3rd Generation Partnership Project (3GPP) evolved packet system consists of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), mobile management unit. (Mobility Management Entity, referred to as MME), Monthly Service Gateway (S-GW), Packet Data Network Gateway (P-GW or PDN GW), Home Subscriber Server (Home Subscriber Server) , hereinafter referred to as HSS), 3GPP's Authentication, Authorization and Accounting (AAA) server, Policy and Charging Rules Function (PCRF) entity and other supporting nodes.

1 is a schematic diagram of a system architecture for an EPS supporting multiple different access technologies. E-UTRAN is a 3GPP radio access network of the EPS system, which internally contains a number of evolved base stations (evolved NodeBs, referred to as eNBs). The MME is responsible for mobility management, non-access stratum signaling processing, and user mobility management context management. Related work; S-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 A packet data network (referred to as PDN) (that is, a network where the operator provides IP services), which is responsible for PDN access and forwarding data between EPS and PDN. PCRF is a policy and charging rule. The function entity, which is connected to the service network protocol (Internet Protocol, IP for short) service network through the receiving interface Rx, obtains service information, and is connected to the gateway device in the network through the Gx/Gxa/Gxc interface, and is responsible for initiating the IP address. The establishment of the bearer ensures the quality of service (QoS of Service), and performs charging control. Wherein, the terminal can pass E-UTRAN, MME and S-GW Accessing to the P-GW and interworking service data with the external PDN, so the E-UTRAN, MME, and S-GW are referred to herein as 3GPP access systems or 3GPP access (this is only one type of 3GPP access system, actually There are other 3GPP access systems, only one of which is listed here.

The EPS also supports access by non-3GPP access systems. The access of the non-3GPP system is implemented through the S2a/S2b/S2c interface, and the P-GW serves as the data anchor for 3GPP access and non-3GPP access. In the system architecture diagram of EPS, non-3GPP systems can be classified into trusted non-3GPP IP access and untrusted non-3GPP IP access. The trusted non-3GPP IP access can be directly connected to the P-GW through the S2a interface; the untrusted non-3GPP IP access needs to be connected to the P-GW through an Evolved Packet Data Gateway (ePDG), ePDG and The interface between the P-GWs is S2b. The S2c provides user plane-related control and mobility support between the user equipment (User Equipment, UE for short) and the P-GW. The supported mobility management protocol is dual-stack. Mobile IPv6 Support for Dual Stack Hosts and Routers (referred to as DSMIPv6).

In the 3GPP access system, the 3GPP mobility management unit MME and the HSS/AAA server are connected through the interface S6a, and the function is to complete the user access authentication when the 3GPP accesses, and report the information of the 3GPP access network to the HSS/AAA server. And the identification information of the P-GW; the non-3GPP access gateway (located in the trusted or untrusted access network) and the evolved packet data gateway ePDG are respectively connected to the HSS/AAA server through the STa, SWa, SWm interfaces (of course, the middle may After the AAA server proxy, the role is to complete the user node access authentication and report the non-3GPP access network information to the HSS/AAA server when the non-3GPP access is performed; the packet data network gateway P-GW and the HSS/AAA server are connected. The S6b is connected to the HSS/AAA server to report the identification information of the P-GW to the HSS/AAA server.

The next generation of the EPS system needs to support the UE to simultaneously access one PDN through multiple access networks, that is, Multiple Access. This is a new function in the EPS evolution process. The related technologies are not yet mature and need to be Continuous improvement. As shown in FIG. 2, the UE accesses the PDN through the same P-GW through the non-3GPP IP access network and the 3GPP access network under the coverage of the non-3GPP and 3GPP access. In this scenario, the P-GW allocates a/pair IP address (only "IPv6 address", or only "IPv4 address", or "IPv4 address and IPv6 address") to the UE, that is, there is only one IP between the UE and the PDN. Connect to an Access Network (IP Connectivity Access Network, IP-CAN for short). As shown in Figure 2, it is assumed that the UE is initially attached through the 3GPP access network, and the UE is built. The PDN connection corresponding to the default access point name (APN). In this process, a GTP data channel or a PMIPv6 data channel is established between the S-GW and the P-GW for transmitting service data, and the 3GPP mobility management unit MME and the home subscriber server/authentication authorization accounting server HSS/AAA The server establishes a session and delivers relevant user and network information; when the UE decides to establish a connection to the PDN by using the non-3GPP access network to transmit some new services, the non-3GPP access gateway and the P-GW are trusted. Establish a PMIPv6 data channel, and need to keep the data channel between the original S-GW and the P-GW not deleted, and continue to transmit services, and trust the access gateway of the non-3GPP system and the home user server/authentication authorization meter The fee server HSS/AAA server establishes a session to transfer and trust user and network information related to the non-3GPP access network; in another case, if the UE decides to establish a connection to the PDN through the untrusted non-3GPP access network, When some new services are transmitted, a PMIPv6 data channel is established between the ePDG and the P-GW, and the data channel between the original S-GW and the P-GW is not deleted, and can be continued. Business, and do not trust non-3GPP systems will ePDG and home subscriber server / AAA server HSS / AAA server to establish a session, transfer and distrust associated with non-3GPP access network and user information.

The scenarios described above are the basic scenarios of multi-access research topics. The prior art still has many problems in supporting the above functions, among which is a problem related to user information and network information storage.

The information stored in the current HSS/AAA server stores information about the P-GW in addition to the subscription information of the UE, and specifically includes the following related content:

1. The identification information of the P-GW needs to be stored in the HSS/AAA server. When the UE crosses the system or initiates multiple access, the correct P-GW identifier can be obtained from the HSS/AAA server, so that P- can be guaranteed. GW does not change, business continuity;

2. When the user initially accesses the network, the HSS/AAA server registers the P-GW identification information. When the user initiates the offline operation, the HSS/AAA server deletes the P-GW information. Specifically, when the 3GPP accesses, the MME reports the update information of the P-GW to the HSS/AAA server; when the 3GPP is offline, the MME sends signaling to the HSS/AAA server to delete the identification information of the P-GW. When the non-3GPP accesses, the P-GW reports the update of its identification information to the HSS/AAA server. When the non-3GPP is offline, the P-GW sends signaling to the HSS/AAA to delete its identification information.

3. When a user switches from a non-3GPP access network to a 3GPP access network, the P-GW does not go to HSS/AAA. The server sends signaling to delete its identification information. When the user switches from the 3GPP access network to the non-3GPP access network, the MME does not send signaling to the HSS/AAA server to delete its identification information.

According to the above requirements, in the multi-access scenario in the prior art, the following problems occur:

1. The UE establishes multiple accesses of the same PDN connection from the 3GPP access system and the non-3GPP access system. At some point, if the UE disconnects the access network from the 3GPP access system, instead of the connection of the 3GPP access system, the MME sends a "notification request" signaling to the HSS/AAA server to notify the HSS/ The AAA deletes the identification information of the P-GW. After the identifier of the P-GW is deleted from the HSS/AAA server, when the UE establishes the multiple access of the PDN connection from the 3GPP access system again, or when switching to the 3GPP, the AAA cannot The HSS/AAA server obtains the identity of the correct P-GW, and cannot guarantee that the P-GW does not change, resulting in multiple access/handover failures;

2. The UE establishes multiple accesses of the same PDN connection from the 3GPP access system and the non-3GPP access system. At some point, if the UE disconnects the access network from the non-3GPP access system and the connection of the 3GPP access system remains, then the P-GW sends a "P-GW address update" message to the HSS/AAA server. Instructing the HSS/AAA server to delete the identification information of the P-GW, and after the identity of the P-GW is deleted from the HSS/AAA server, when the UE establishes the multiple access of the PDN connection from the non-3GPP access system again, or In the case of a non-3GPP handover, the identity of the correct P-GW cannot be obtained from the HSS/AAA server, and the P-GW cannot be guaranteed to be changed, resulting in multiple access/handover failures.

Therefore, the operation of the multiple access scenario is quite different from that of the prior art. How to properly notify the HSS/AAA server and correctly store/delete the P-GW identifier to ensure that the subsequent processes can work normally. What technology cannot achieve is also an inevitable problem to be solved in multi-access research topics. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and system for saving a packet data network gateway identifier in a multi-access scenario, and to ensure normal operation of the system when a P-GW identification operation is involved in a multiple access scenario.

In order to solve the above problem, the present invention provides a method for saving a packet data network gateway identifier in a multiple access scenario, including: the user equipment passes through two access networks, that is, a first access network and a second access network. The HSS/AAA server stores the identifier of the packet data network gateway when accessing a packet data network and establishing the same packet data network connection; the packet data network gateway detects that the user equipment accesses through the two access networks simultaneously And when the packet data network establishes the same packet data network connection, notifying the HSS/AAA server that the packet data network connection is in a multi-access state; after receiving the notification, the HSS/AAA server records the recorded location The access status of the packet data network connection is changed from a single access state to a multiple access state, and the identifier of the packet data network gateway is retained; when the access of one of the two access networks is released, The HSS/AAA server changes the recorded multi-access status to a single access state and retains the identity of the packet data network gateway.

The above preservation method also has the following characteristics:

The first access network is a 3GPP access network, and the second access network is a non-3GPP access network; or the first access network is a non-3GPP access network, and the second access network is 3GPP. Access Network.

The above preservation method also has the following characteristics:

The manner in which the packet data network gateway notifies the HSS/AAA server that the packet data network connection is in a multiple access state is that the packet data network gateway sends a packet data network gateway address update request message to the HSS/AAA server. Order, and carry multiple access instructions.

The above preservation method also has the following characteristics:

In the step of releasing the access of one of the two access networks, the HSS/AAA server changes the recorded multi-access status to a single access state, and the user equipment moves by The management unit, the service gateway, and the packet data network gateway initiate release of the access of the 3GPP access network, and the HSS/AAA server detects the packet data after receiving the notification request signaling sent by the mobility management unit. When the access status of the network connection is a multi-access status, the access status of the packet data network connection is changed to a single access status.

The above preservation method also has the following characteristics:

In the step of releasing the access of one of the two access networks, the HSS/AAA server changes the recorded multiple access status to a single access state, and the user equipment passes the non- When the 3GPP access network gateway and the packet data network gateway initiate the release of the access of the non-3GPP access network, the HSS/AAA server receives the packet data network gateway address update command sent by the packet data network gateway. Detecting, that the access status of the packet data network connection is a multiple access status When the access status of the packet data network connection is changed to a single access status.

The above preservation method also has the following characteristics:

In the step of releasing the access of one of the two access networks, the HSS/AAA server changes the recorded multiple access status to a single access state, and the user equipment directly passes When the packet data network gateway initiates the release of the access of the non-3GPP access network, after detecting the update command, detecting that the access status of the packet data network connection is a multi-access state, the packet data network is The access status of the connection is changed to the single access status.

The above preservation method also has the following characteristics:

When the packet data network gateway initiates release of access of one of the two access networks, the HSS/AAA server receives the packet data network gateway address update command sent by the packet data network gateway. And detecting, when the access status of the packet data network connection is a multiple access status, changing an access status of the packet data network connection to a single access status, and retaining an identifier of the packet data network gateway.

The above preservation method also has the following characteristics:

When the user equipment or the packet data network gateway initiates releasing the access of another access network, the HSS/AAA server receives the release indication signaling and detects the recorded access status of the packet data network connection. When the status is single access, the identifier of the packet data network gateway is deleted.

The above preservation method also has the following characteristics:

When the user equipment accesses a packet data network connection through the 3GPP access network or the non-3GPP access network, the HSS/AAA server records that the access status of the packet data network connection is a single access state, and Saving the packet data network gateway identifier; when releasing the access of the access network, the HSS/AAA server detects that the recorded access status of the packet data network connection is a single access state, and deletes the packet data. Network gateway ID.

The above preservation method also has the following characteristics:

The HSS/AAA server records an access status of the packet data network connection in one of the following manners; setting a flag bit for recording an access status of the packet data network connection, by changing the value of the flag bit, recording Different access states of the packet data network connection; or Different access states for the connection.

In order to solve the above technical problem, the present invention further provides a storage system for a packet data network gateway identifier in a multiple access scenario, including a packet data network gateway and an HSS/AAA server, the home subscriber or an authentication and authorization billing server, And storing, when the user equipment accesses a packet data network connection through two access networks, that is, the first access network and the second access network, storing the packet data network gateway identifier; the packet data network gateway is set to: When detecting that the user equipment accesses the packet data network and establish the same packet data network connection through two access networks, notifying the HSS/AAA server that the packet data network connection is in a multi-access state; The HSS/AAA server is further configured to: after receiving the notification, change the recorded access status of the packet data network connection from a single access state to a multiple access state, and reserve the packet data network gateway Identifying; when the access of one of the two access networks is released, changing the recorded multiple access status to single access State, and identifying the reserved packet data network gateway.

The above system also has the following characteristics:

The first access network is a 3GPP access network, and the second access network is a non-3GPP access network; or the first access network is a non-3GPP access network, and the second access network is 3GPP. Access Network. The above system also has the following characteristics:

The HSS/AAA server is configured to: initiate, by the user equipment, release the access of the 3GPP access network by using a mobility management unit, a serving gateway, and the packet data network gateway, and receive the sending by the mobility management unit. After the notification request signaling, or the user equipment initiates the release of the non-3GPP access network through the non-3GPP access network gateway and the packet data network gateway, the user equipment passes the packet data network gateway. Initiating the release of the non-3GPP access network connection, or the packet data network gateway initiates release of the access network of the two access networks to detect that the access status of the packet data network connection is multiple access After the state, changing the access status of the packet data network connection to a single access state, and retaining the label of the packet data network gateway Knowledge.

With the method of the present invention, the HSS/AAA can be reasonably notified, and the P-GW identifier can be stored or deleted correctly, and the P-GW identification operation is ensured in the multi-access scenario to ensure normal operation of the system. BRIEF abstract

1 is a schematic diagram of an EPS system architecture in the prior art;

2 is a schematic diagram of a multiple access scenario according to the related art in the prior art;

3 is a first flow chart of simultaneous access of a 3GPP access network and a non-3GPP access network in Embodiment 1;

4 is a second flow diagram of simultaneous access of a 3GPP access network and a non-3GPP access network in Embodiment 1;

5 is a third flow diagram of simultaneous access of a 3GPP access network and a non-3GPP access network in Embodiment 1;

6 is a flowchart of a method for saving a P-GW identifier in Embodiment 1;

7 is a flowchart of a method for saving a P-GW identifier in Embodiment 2;

8 is a flowchart of a method for saving a P-GW identifier in Embodiment 3;

FIG. 9 is a flowchart of a method for saving a P-GW identifier in Embodiment 4. Preferred embodiment of the invention

According to the order in which the UE accesses the access network, the 3GPP access network may be referred to as a first access network, and the non-3GPP access network may be referred to as a second access network; or the non-3GPP access network may be referred to as The first access network refers to the 3GPP access network as the second access network. The UE connects to the same PDN through the first access network and the second access network, and when the same PDN connection is established, the HSS/AAA server stores the packet data network gateway identifier; the UE releases the access network of the two access networks. Upon entering, the HSS/AAA server does not delete the P-GW identity, but continues to retain the P-GW identity. When the UE establishes the access of the PDN connection from the released access network again, or when the access network is switched, the service can be performed from the HSS/AAA. The device obtains the identity of the correct P-GW to ensure correct execution of the re-access or handover.

There are many ways for the HSS/AAA server to implement the above operations. To minimize the impact of the information exchange process in the existing protocol, the following methods can be used: The UE establishes the same PDN connection through two access networks, and simultaneously accesses one. In the PDN, the HSS/AAA server records the access status of the PDN connection as a multi-access status; when the UE or the P-GW initiates the release of access to one of the two access networks, the HSS/AAA server detects it. After the previously accessed state of the recorded PDN connection is in the multiple access state, the access state of the PDN connection is changed to the single access state. When the UE or the P-GW initiates the release of the access of the last access network, the HSS/AAA server detects that the previously accessed state of the PDN connection recorded is a single access state, and then deletes the P-GW identifier.

The HSS/AAA server can set the flag of the PDN connection access status, and change the PDN connection access status by changing the value of this flag. For example, a flag bit of 1 indicates a multi-access state; a flag bit of 0 indicates a single access state. It is also possible to store the access status of the current PDN connection by storing two or one P-GW identifiers. For example, the identity of the two P-GWs stored indicates a multi-access state; the identity of a P-GW is stored to indicate a single access state.

a storage system for packet data network gateway identification in a multiple access scenario, including a packet data network gateway and an HSS/AAA server;

The packet data network gateway is configured to: notify the HSS/AAA server of the packet data when detecting that the user equipment accesses the packet data network and establish the same packet data network connection through two access networks simultaneously The network connection is in a multi-access state;

The HSS/AAA server is configured to save a packet data network gateway identifier when the user equipment accesses a packet data network connection through two access networks, that is, the first access network and the second access network; After the multiple access indication, changing the recorded access status of the packet data network connection from a single access state to a multiple access state, and retaining the identity of the packet data network gateway; When the access of an access network in the network is released, the recorded multiple access status is changed to a single access status, and the identifier of the packet data network gateway is retained; and the user equipment passes the mobility management unit and the service gateway. And the packet data network gateway initiates release of the access of the 3GPP access network, after receiving the notification request signaling sent by the mobility management unit; or; the user equipment passes the non-3GPP access network gateway and the The packet data network gateway initiates release of the non-3GPP access Network access, received

After the user equipment initiates the release of the non-3GPP new instruction by the packet data network gateway; or, after the packet data network gateway initiates releasing one of the update instructions of the two access networks, After detecting that the access status of the packet data network connection is a multiple access status, changing an access status of the packet data network connection to a single access status, and retaining an identifier of the packet data network gateway.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

Embodiment 1

When the UE initially accesses from a single access network, the default PDN connection status of the UE in the HSS/AAA server is a single access state, and the UE accesses the PDN through the second access network to implement the 3GPP access network and the non- The 3GPP access network is simultaneously linked to the PDN. When the same PDN connection is established, the P-GW notifies the HSS/AAA server that the PDN connection status of the UE is a multi-access status, and the HSS/AAA server saves the P-GW identifier in the PDN connection. And the current state is the multi-access state. After the UE initiates the multi-connection removal operation of the 3GPP access network, the HSS/AAA server receives the "Notification Request" message sent by the MME, and detects that the previous state of the PDN connection is in the multi-access state, and only changes the multi-connection state. It is a single access state without deleting the P-GW identity.

The process of the UE accessing a certain PDN through the 3GPP access network and the non-3GPP access network may be as shown in FIG. 3 (the UE first accesses the PDN through the non-3GPP access network, and then accesses the PDN through the 3GPP access network) 4 (the UE first accesses the PDN through the 3GPP access network, and then accesses the PDN through the non-3GPP access network (S2a mode)) and FIG. 5 (the UE first accesses the PDN through the 3GPP access network) And then access any of the connections shown by the non-3GPP access network (S2c mode) access to the PDN connection) Into the process. The access process of FIG. 3, FIG. 4, and FIG. 5 is specifically described below:

As shown in FIG. 3, the UE has attached to the EPS through the non-3GPP access network, and may have one or several service transmissions. Then, the terminal initiates an access request to the EPS through the 3GPP access network, and the P-GW receives the proxy. After the binding update/create default bearer request signaling, the P-GW advertises that the HSS/AAA server is currently a multiple access scenario. The specific access process includes the following steps:

Step 301: The UE accesses the EPS through the non-3GPP access network, and possibly related services are transmitted on the connection. According to the existing process, the HSS/AAA server has saved the P-GW identifier, and the default access is performed. The status is a single access state;

Step 302: The UE sends an “attach request” signaling to the MME, requesting to access the EPS through the 3GPP access system.

Step 303: The UE completes access authentication, location update, and authorization operations through a 3GPP access network (MME).

Step 304: The MME sends a “establish default bearer request” signaling to the S-GW.

The foregoing steps 302 to 304 are UE-initiated attachment steps in the 3GPP access network. If the UE has completed the attachment in the 3GPP access network, the UE only initiates multiple access of another PDN connection in the 3GPP access network, then step 302 The "PDN Connection Setup Request" signaling is sent in the middle, and step 303 is not required.

Step 305: After receiving the “establish default bearer request” signaling sent by the MME, the S-GW sends “establish default bearer request” signaling (GTP) or “proxy binding update” signaling (PMIPv6) to the P- GW, requesting to establish a tunnel binding;

Step 306: After determining, according to the corresponding mechanism, the P-GW connection of the current UE is a multi-access situation, the P-GW sends a “P-GW address update request” signaling to the HSS/AAA server, and carries a “multiple access indication”;

Step 307: After receiving the "multiple access indication", the HSS/AAA server learns that the PDN connection status of the current UE is a multi-access situation, and records that the PDN connection status of the UE is a multi-access status, and maintains the saved P. - GW logo.

Step 308: The P-GW responds to the S-GW with "establish default bearer response" signaling (GTP) or "proxy binding response" (PMIPv6) signaling, and announces that the S-GW tunnel binding is completed. Step 309, the S-GW responds to the MME with a "default bearer setup response";

Step 310: Perform radio bearer setup and bearer update operations between the UE and the MME.

As shown in Figure 4, the terminal has been attached to the EPS through the 3GPP access network and may have one or several traffic transmissions. Then, the terminal initiates an access request (based on the S2a interface) to the EPS through the trusted non-3GPP access network. After receiving the proxy binding update, the P-GW advertises that the HSS/AAA server is currently a multiple access scenario. The specific access process includes the following steps:

Step 401: The UE accesses the EPS system through the 3GPP access network, and possibly related services are transmitted on the connection, where the S-GW and the P-GW establish a data channel through the GTP or the PMIPv6 protocol. The process, the HSS/AAA server has saved the P-GW identity, and the default access state is a single access state;

Step 402: The UE performs a specific non-3GPP access network air interface link establishment operation with the non-3GPP access gateway.

Step 403: The UE completes an access authentication and authorization operation by using a non-3GPP access network.

Step 404: The UE initiates an attach request to the non-3GPP access network according to its specific manner. The foregoing steps 402 to 404 are the UE-initiated attach procedure in the 3GPP access network. If the UE has completed attachment in the non-3GPP access network, the UE Only the multiple access of another PDN connection is initiated in the non-3GPP access network, then the "PDN Connection Setup Request" signaling is sent in step 402, and step 403 is not required.

Step 405: After receiving the attach request/PDN connection establishment request sent by the UE, the non-3GPP access gateway sends a “proxy binding update” message to the P-GW to request to establish a tunnel binding.

Step 406: After determining, according to the corresponding mechanism, the P-GW connection of the current UE is a multi-access situation, the P-GW sends a “P-GW address update request” signaling to the HSS/AAA server, and carries a “multiple access indication”;

Step 407, after receiving the "multiple access indication", the HSS/AAA server learns the current UE

After the PDN connection is a multiple access situation, the PDN connection status of the UE is recorded as a multi-access status, and the saved P-GW identifier is maintained;

Step 408: The P-GW responds to the non-3GPP access gateway with "proxy binding acknowledgement" signaling, and announces Binding of the non-3GPP access gateway tunnel is completed;

Step 409: The UE implements successful attachment in the non-3GPP access network.

As shown in FIG. 5, the same as that shown in FIG. 4, it means that the UE accesses through the 3GPP access network first, and then accesses through the non-3GPP access network, which is different from the access method shown in FIG. 4. The UE accesses the S2c interface of the non-3GPP access network, and the P-GW advertises that the HSS/AAA server is currently a multiple access scenario. The specific access process includes the following steps: Step 501 to Step 503 and Step 401 in FIG. Step 403 is the same;

Step 504: The UE initiates an attach request to the non-3GPP access network according to its specific manner, and performs local address allocation, bootstrap, and the like;

The above is the UE-initiated attaching procedure in the second access network. If the UE has completed the attach, the UE only wants to initiate multiple accesses of another PDN connection in the second access network, then it can be omitted from steps 502-503. This step, step 504, initiates a non-3GPP access system specific "PDN connection request" signaling;

Step 505: The UE sends a “binding update” message to the P-GW to request to establish a tunnel binding.

Step 506: After determining, according to the corresponding mechanism, the P-GW connection of the current UE is a multi-access situation, the P-GW sends a “P-GW address update request” signaling to the HSS/AAA server, and carries a “multiple access indication”;

Step 507: After receiving the "multiple access indication", the HSS/AAA server learns the current UE

Step 508: The P-GW sends a "Binding Confirmation" signaling to the UE, and announces that the UE tunnel binding is completed. After the access procedure of the foregoing Figure 3, Figure 4 or Figure 5, the UE accesses a PDN connection through the 3GPP access network and the non-3GPP access network. As shown in Figure 6, the UE initiates the release of the 3GPP access network. The process of entering includes the following steps:

Step 601: After the process shown in FIG. 3, FIG. 4 or FIG. 5, the UE simultaneously accesses a PDN through the 3GPP access network and the non-3GPP access network, and establishes the same PDN connection. Step 602: The UE sends a detach request signaling to the MME through the 3GPP access network. The foregoing step 602 is a detachment procedure initiated by the UE in the 3GPP access network, if the UE only wants to initiate a certain PDN in the 3GPP access network. The removal of the connection, then the step is a "PDN connection deletion request"signaling; Step 603, the MME sends a delete bearer request signaling to the S-GW;

Step 604: After receiving the delete bearer request signaling sent by the MME, the S-GW sends a delete bearer request signaling or a proxy binding update message to the P-GW, where the lifetime of the proxy binding update message is zero, indicating that the request is Delete the tunnel binding;

Step 605: The P-GW responds to the S-GW with a delete bearer response or a proxy binding update response, and notifies that the S-GW tunnel is unbound.

Step 606: The S-GW sends a delete bearer response signaling to the MME.

Step 607: The S-GW responds to the UE with a detachment response, and notifies that the attachment is successfully removed.

Step 608: The MME learns that the current UE deletes the connection from the 3GPP access network, sends an announcement request signaling to the HSS/AAA server, and the HSS/AAA server returns a response to the MME.

Step 609: After detecting that the recorded PDN connection access status of the UE is a multi-access state, the HSS/AAA server changes the PDN connection status of the UE to a single access state, and retains the P-GW identifier.

If the UE or the P-GW initiates the process of releasing the non-3GPP access network by the non-3GPP access network after the step 609, the HSS/AAA server detects that the access status of the PDN connection is a single access state, and then deletes the P-GW. Logo.

Through the above method, when the UE establishes the access of the PDN connection from the 3GPP access network again, or when switching from the non-3GPP, the identifier of the correct P-GW can be obtained from the HSS/AAA server to ensure re-access or handover. Correct execution.

The foregoing embodiment 1 illustrates a scenario in which the UE initiates removal of access from the 3GPP access network after the UE accesses a certain PDN through the 3GPP access network and the non-3GPP access network. The following describes the scenario in which the UE initiates the removal of access from the non-3GPP access network by using the second embodiment and the third embodiment. In the second embodiment, the non-3GPP access network is based on the S2a interface, and in the third embodiment, the non-3GPP access network is based on the S2c interface. Embodiment 2

When the UE initially accesses from a single access network, the default PDN connection status of the UE in the HSS/AAA server is a single access state, and the UE accesses the PDN through the second access network to implement the 3GPP access network and the non- The 3GPP access network is simultaneously linked to a certain PDN. When the same PDN connection is established, the P-GW notifies the HSS/AAA server that the PDN connection status of the UE is a multi-access state, and the HSS/AAA server saves the P-GW in the PDN connection. The identity and current status are the multiple access status. After the UE initiates the multi-connection removal operation of the non-3GPP access network, the HSS/AAA server receives the "Update P-GW Address Request" message sent by the P-GW, and detects that the previous state of the PDN connection is a multi-access status. After that, only the multi-connection state is changed to the single access state without deleting the P-GW identity.

In the second embodiment, the UE completes simultaneous access through the 3GPP access network and the non-3GPP access network.

The process of PDN connection can also be any of the processes shown in Figure 3, Figure 4 or Figure 5. As shown in FIG. 7, the process for the UE to initiate the release of the non-3GPP access network access (based on the S2a interface) includes the following steps: Step 701: After the process shown in FIG. 3, FIG. 4 or FIG. 5, the UE accesses through the 3GPP. The network and the non-3GPP access network (through the S2a interface) simultaneously access a PDN to establish the same PDN connection; Step 702: The UE initiates a non-3GPP access network specific detach request through the non-3GPP access gateway;

The foregoing step 702 is a UE-initiated detach step in the second access network. If the UE only wants to initiate the removal of a certain PDN connection in the second access network, the step is a non-3GPP access system-specific "PDN". Connection delete request "signaling.

Step 703: After receiving the detach request/PDN connection deletion request sent by the UE, the non-3GPP access gateway sends a “proxy binding update” message to the P-GW, where the lifetime of the signaling is set to zero, and the request is deleted. Tunnel binding

Step 704: The P-GW sends a P-GW address update request signaling to the HSS/AAA server. Step 705: After detecting that the recorded PDN connection status of the UE is a multi-access status, the HSS/AAA server changes the PDN connection status of the UE to a single access status, and retains the P-GW identifier.

Step 706: The P-GW responds to the non-3GPP access gateway with a "proxy binding acknowledgement" signaling, and announces that the non-3GPP access gateway tunnel debinding is completed.

Step 707: The UE successfully de-attaches in the non-3GPP access network.

If the UE or the P-GW initiates the process of releasing the 3GPP access network after the step 707, the HSS/AAA server detects that the access status of the PDN connection is a single access state, and then deletes the P-GW identifier.

Embodiment 3

The main difference between the third embodiment and the second embodiment is that the UE initiates the process of releasing the access of the non-3GPP access network based on the S2c interface. As shown in Figure 8, the following steps are included:

Step 801: After the process shown in FIG. 3, FIG. 4, or FIG. 5, the UE accesses a PDN through the 3GPP access network and the non-3GPP access network (through the S2c interface) to establish the same PDN connection. Step 802: Determining to delete the part of the non-3GPP access of the PDN connection, and then sending the binding update signaling to the P-GW, and setting the lifetime to zero in the signaling;

Step 803: The P-GW sends a P-GW address update request signaling to the HSS/AAA server. Step 804: After the HSS/AAA server detects that the recorded PDN connection status of the UE is a multiple access state, the PDN of the UE is used. The connection status is changed to a single access state and the P-GW identity is retained.

Step 805: The P-GW sends a "Binding Confirmation" signaling to the UE, and announces that the UE is unbound. In step 806, the UE and the P-GW release the non-3GPP access network resources.

If the UE or the P-GW initiates the process of releasing the 3GPP access network after the step 806, the HSS/AAA server detects that the access status of the PDN connection is a single access state, and then deletes the P-GW identifier.

Embodiment 4

Described in Embodiments 1, 2, and 3 is a UE initiated release of a 3GPP access network or a non-3GPP connection. In the access procedure of the network access, the access procedure initiated by the P-GW to release the 3GPP access network or the non-3GPP access network is described in the fourth embodiment. As shown in FIG. 9, the method includes the following steps:

Step 901: After the process shown in FIG. 3, FIG. 4 or FIG. 5, the UE simultaneously accesses a PDN through the 3GPP access network and the non-3GPP access network, establishes the same PDN connection, and may have different service data. Transfer into the system;

Step 902: The P-GW decides to delete the access of one of the access networks according to the triggering of other network elements.

The deletion of the PDN connection initiated by the P-GW may be because all IP flows of one access network are migrated to another access network after the UE initiates IP flow migration. The access network has no service data transmission. For other reasons.

Step 903: The P-GW sends a P-GW address update request signaling to the HSS/AAA server. Step 904: After the HSS/AAA server detects that the recorded PDN connection status of the UE is a multiple access state, the PDN of the UE is used. The connection status is changed to a single access state and the P-GW identity is retained.

Step 905: The P-GW initiates a deletion process of an access network with multiple PDN accesses.

In addition to the cases described in the above embodiments 1 to 4, if the UE accesses a certain PDN connection through only one access network, that is, through a 3GPP access network or a non-3GPP access network, the HSS/AAA server defaults to access of the PDN connection. The state is a single access state, and the P-GW identity is saved. When the UE or the P-GW initiates the access removal process of the access network, the HSS/AAA server detects that the recorded PDN connection access state is a single access state. , release access to the access network and delete the P-GW identity.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability With the method of the present invention, the HSS/AAA server can be reasonably notified, and the P-GW identifier can be stored or deleted correctly. When the P-GW identification operation is involved in the multiple access scenario, the system is guaranteed to operate normally.

Claims

Claim

The method for saving a packet data network gateway identifier in a multiple access scenario includes: the user equipment simultaneously accesses a packet data network and establishes the same group by using two access networks, that is, the first access network and the second access network. When the data network is connected, the Home Subscriber Server (HSS) / Authentication and Authorization Accounting (AAA) server stores the identifier of the packet data network gateway;

When the packet data network gateway detects that the user equipment accesses the packet data network through two access networks and establishes the same packet data network connection, notifying the HSS/AAA server that the packet data network connection is a multi-access state; after receiving the notification, the HSS/AAA server changes the recorded access status of the packet data network connection from a single access state to a multi-access state, and retains the packet data network. The identity of the gateway;

Upon releasing the access of one of the two access networks, the HSS/AAA server changes the recorded multiple access status to a single access state and retains the identity of the packet data network gateway.

2. The storage method according to claim 1, wherein

The first access network is a 3rd Generation Partnership Project (3GPP) access network, and the second access network is a non-3GPP access network; or the first access network is a non-3GPP access network, The second access network is a 3GPP access network.

3. The preservation method according to claim 1, wherein

4. The storage method according to claim 2, wherein

5. The storage method according to claim 2, wherein

In the step of releasing the access of one of the two access networks, the HSS/AAA server changes the recorded multiple access status to a single access state, and the user equipment passes the non- When the 3GPP access network gateway and the packet data network gateway initiate the release of the access of the non-3GPP access network, the HSS/AAA server receives the packet data network gateway address update command sent by the packet data network gateway. And detecting, when the access status of the packet data network connection is a multiple access status, changing an access status of the packet data network connection to a single access status.

6. The storage method according to claim 2, wherein

7. The storage method according to claim 1, wherein

The method of saving according to any one of claims 1 to 7, wherein the method further comprises:

The method of saving according to any one of claims 2 to 7, wherein the method further comprises:

The user equipment accesses a packet data through the 3GPP access network or a non-3GPP access network. When the network is connected, the HSS/AAA server records the access status of the packet data network connection as a single access state, and saves the packet data network gateway identifier;

When the access of the access network is released, the HSS/AAA server detects that the recorded access status of the packet data network connection is a single access state, and deletes the packet data network gateway identifier.

The save method according to any one of claims 1 to 6, wherein the HSS/AAA server records an access status of the packet data network connection in one of the following manners;

Setting a flag bit for recording an access status of the packet data network connection, and changing a value of the flag bit to record different access states of the packet data network connection; or different access states of the network connection .

11. A storage system for packet data network gateway identification in a multiple access scenario, including a packet data network gateway and an HSS/AAA server.

The HSS/AAA server is configured to: when the user equipment accesses a packet data network connection through two access networks, that is, the first access network and the second access network, the packet data network gateway identifier is saved;

The packet data network gateway is configured to: notify the home HSS/AAA server of the packet when detecting that the user equipment simultaneously accesses the packet data network through two access networks and establish a same packet data network connection The data network connection is in a multi-access state;

The HSS/AAA server is further configured to: after receiving the notification, change the recorded access status of the packet data network connection from a single access state to a multiple access state, and reserve the packet data network The identifier of the gateway; when the access of one of the two access networks is released, the recorded multiple access state is changed to a single access state, and the identifier of the packet data network gateway is reserved.

12. The system of claim 11 wherein:

The first access network is a 3rd Generation Partnership Project (3GPP) access network, and the second access network is a non-3GPP access network; or the first access network is a non-3GPP access network, Second connection The access network is a 3GPP access network.

13. The system of claim 12, wherein

The home HSS/AAA server is set to:

After the user equipment initiates the release of the access of the 3GPP access network by using the mobility management unit, the serving gateway, and the packet data network gateway, after receiving the notification request signaling sent by the mobility management unit; or

The user equipment initiates release of the access of the non-3GPP access network through the non-3GPP access network gateway and the packet data network gateway, and receives the packet data network gateway address update command sent by the packet data network gateway; Or,

After the user equipment initiates release of the non-3GPP access network by using the packet data network gateway; or

The packet data network gateway initiates release of one of the two access networks, detects that the access state of the packet data network connection is a multi-access state, and connects the packet data network connection. The incoming state is changed to a single access state and the identity of the packet data network gateway is retained.