WO2012155774A1

WO2012155774A1 - Method, system for establishing s9 sub-session, and policy and charging rules function

Info

Publication number: WO2012155774A1
Application number: PCT/CN2012/074655
Authority: WO
Inventors: 刘国燕; 周晓云; 吴锦花; 毕以峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-17
Filing date: 2012-04-25
Publication date: 2012-11-22
Also published as: CN102791042A; CN102791042B

Abstract

Disclosed in the present invention is a method for establishing S9 sub-session, wherein Home Policy and Charging Rules Function (H-PCRF) triggers Visited Policy and Charging Rules Function (V-PCRF) to establish the S9 sub-session. The method comprises: the H-PCRF sends original information about establishing the S9 sub-session to the V-PCRF; and the V-PCRF receives the original information about establishing the S9 sub-session, generates information relating to the S9 sub-session according to the original information about establishing the S9 sub-session, and establishes the S9 sub-session. In the present invention, the H-PCRF triggers the V-PCRF to establish the S9 sub-session in case there is no interface between the V-PCRF and the H-PCRF.

Description

S9 sub-session establishment method, system and PCRF

Technical field

The present invention relates to the field of mobile communications, and in particular, to an S9 sub-session establishment method, system, and PCRF. Background technique

The Evolved Packet System (EPS) of the 3rd Generation Partnership Project (3GPP) is evolved by Evolved Universal Terrestrial Radio Access Network (E-UTRAN), mobile management. A component (Mobility Management Entity, MME), a Serving Gateway (S-GW), a Packet Data Network Gateway (P-GW), and a Home Subscriber Server (HSS).

The EPS supports interworking with non-3GPP systems, wherein interworking with non-3GPP systems is implemented through the S2a/b/c interface, and the P-GW acts as an anchor between 3GPP and non-3GPP systems. In the system architecture diagram of EPS, non-3GPP system access is divided into untrusted non-3GPP access and trusted non-3GPP access; wherein untrusted non-3GPP access requires evolved packet data gateway (Evolved Packet Data Gateway) , ePDG ) is connected to the P-GW, the interface between the ePDG and the P-GW is S2b; the trusted non-3GPP access can be directly connected to the P-GW through the S2a interface, and the S2a interface uses the proxy mobile IP (Proxy Mobile IP, PMIP) The protocol exchanges information; in addition, the S2c interface provides user plane related control and mobility support between the User Equipment (UE) and the P-GW, and the supported mobility management protocol supports dual stack mobility. IPv6 (Moblie IPv6 Support for Dual Stack Hosts and Routers, DSMIPv6), which can be used for untrusted non-3GPP and trusted non-3GPP access.

If the EPS supports Policy and Charging Control (PCC), the Policy and Charging Rules Function (PCRF) performs policy and charging rules. It uses the interface Rx and the carrier network protocol. (Internet Protocol, IP) The application function (Application Function, AF) in the service network is connected to obtain service information, which is used to generate service information of the PCC policy. When the S5/S8 interface between the S-GW and the P-GW uses GPRS In the GPRS Tunneling Protocol (GTP), the P-GW resides in the Policy and Charging Enforcement Function (PCEF). The PCRF and the P-GW exchange information on the Gx interface. Establish, modify, and release, guarantee the quality of service (QoS) of service data, and perform charging control. Bearer Binding and Event Report Function (BBERF) is used in the S-GW when the S5/S8 interface of the S-GW and the P-GW uses the Proxy Mobile IP (PMIP). And the information is exchanged between the S-GW and the PCRF through the Gxc interface. When accessing through a trusted non-3GPP network, the BBERF is also resident in the trusted non-3GPP access gateway, and the access gateway of the trusted non-3GPP network exchanges information with the PCRF through the Gxa interface, as shown in FIG.

When the User Equipment (UE) roams, the home PCRF (Home PCRF,

The interface between the H-PCRF and the Visited PCRF (V-PCRF) is an S9 interface, so that the policy events of the roaming and the home network can be interworked and negotiated. The S2a and S2b access modes are used as an example. 2 is shown.

When the fixed network accesses the mobile network as a non-3GPP network, it is a fixed network mobile convergence architecture. In the fixed-line mobile convergence architecture, a wireless LAN (WLAN) or a home base station (Home NodeB or Home eNodeB, H(e)NB) can access the EPS through a fixed line (as shown in Figure 3-6). ), where the fixed network is used as a non-3GPP network access, and the Broadband Policy Control Function (BPCF) and the PCRF exchange information through the S9* interface, so that the mobile network and the fixed network policy architecture can communicate with each other to implement mobile network resources. Unified management control of fixed network resources. In the roaming scenario, the interface between the H-PCRF, the V-PCRF, and the BPCF needs to establish a corresponding session, so that the policy of the home mobile network can be transmitted to the policy function entity of the roaming fixed network, and the mobile network resource and the fixed network are realized. Unified management of resources.

If the fixed network can sense the mobile UE access, or if there is an interface between the visited mobile network element and the V-PCRF, the BPCF requests the V-PCRF to establish an S9* session or the visited mobile network element sends a gateway control to the V-PCRF. The session establishment request/IP-CAN session establishment request message, and the V-PCRF triggers the establishment of an S9 session with the H-PCRF, as shown in FIG. Moreover, the V-PCRF can be based on key information in the received message, including: a user identifier, a Packet Data Network (PDN) identifier, and a Packet Data Network (PDN) connection identifier (if the PDN identifier and If the PDN connection is marked as the corresponding relationship, the PDN is not carried. Connection identifier) to further determine whether to establish an S9 subsession.

The following are the principles for establishing a S9 subsession by V-PCRF:

Based on the received request message (including: gateway control session establishment request/IP-CAN session establishment request message), the V-PCRF first determines whether the UE has a corresponding S9 session and performs corresponding operations:

A) If there is an S9 session, the request type is the update request status; the V-PCRF further determines whether the request message contains the PDN identifier and the PDN connection identifier (conditional optional) (eg: for S2a interface, S5/S8 GTP/PMIP and S2b) The interface scenario carries this information, and finds whether the corresponding S9 subsession exists in the PDN and processes it accordingly:

A1. If the corresponding S9 subsession cannot be found, the V-PCRF will assign a new one.

The S9 sub-session identifier is included in the newly created sub-session Attribute-Value Pair (AVP), and the AVP also includes the sub-session operation AVP, etc., wherein the sub-session operation AVP is set to the "established" state. .

A2. If the corresponding S9 sub-session can be found, the specific operations are divided into the following cases: a. When the V-PCRF receives the request message, the session binding indication is set to "session extension binding", new If the gateway control session is associated with the existing IP-CAN session with the existing gateway control session, the V-PCRF will assign a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the AVP also includes the sub-session operation. AVP, etc., wherein the sub-session operation AVP is set to the "established" state, and the new gateway control session and the new S9 sub-session are associated;

b. When the V-PCRF receives a new BBERF request message, the new gateway control session is associated with the existing IP-CAN session with the existing gateway control session, but there is no "session extension binding indication", then V- The PCRF modifies the existing S9 sub-session related information, for example: the sub-session operation information is set to the "modified" state;

c. When the V-PCRF receives the IP-CAN session request, the V-PCRF modifies the existing S9 sub-session related information, for example: the sub-session operation information is set to the "modified" state.

B) If there is no S9 session, the V-PCRF will create a new S9 session, the request type is the initial request status, and further determine whether the PDN identifier and the PDN connection identifier are included (conditional optional)

(For example: S2a interface, S5/S8 GTP/PMIP and S2b interface scenarios will carry this information): If included, the V-PCRF will assign a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the AVP also includes the sub-session operation AVP and the like.

From the above content, the V-PCRF determines that the information established by the S9 sub-session mainly includes: PDN connection identifier, APN, diameter information, and the like.

In the case that the fixed network is unable to sense the mobile UE access, and there is no interface between the visited mobile network element and the V-PCRF (such as the H(e)NB access shown in FIG. 3, or FIG. 4, FIG. The WLAN S2b access shown in Figure 5, the WLAN S2c access shown in Figure 6, see the following description), as can be seen from the following description, H-PCRF and P-GW, belonging to ePDG (as shown in Figure 5) Show) has an interface association. After receiving the corresponding signaling message, the P-GW requests the H-PCRF to establish an IP-CAN session. After the H-PCRF is triggered by the P-GW message, the V-PCRF requests the BPCF to establish an S9* session. Subsequent business policy resources are negotiated. In addition, if the Gxb* interface is supported between the Evolved Packet Data Gateway (ePDG) and the PCRF (as shown in Figure 5), the ePDG will request the H-PCRF after receiving the corresponding signaling message. A gateway control session is established. After the H-PCRF is triggered by the ePDG message, the V-PCRF requests the BPCF to establish an S9* session.

From the above analysis, the H-PCRF needs to trigger the establishment of the S9 session. In the scenario where the PDN-related information can be obtained, the S9 sub-session based on the PDN level needs to be triggered. For the H-PCRF trigger, the S9 session between the H-PCRF and the V-PCRF is established, and the corresponding solution has been solved. The prior art does not solve the problem that the H-PCRF triggers the V-PCRF to establish the S9 sub-session. In solving this problem.

Description:

Figure 3 shows the H(e)NB access, and the Gx interface exists between the P-GW and the H-PCRF, and the V-PCRF does not have an interface with the visited NE.

Figure 4 is a WLAN S2b access, and there is a Gx interface between the P-GW and the H-PCRF, and the V-PCRF does not have an interface with the visited network element of the non-3GPP network;

5 is a WLAN S2b access, a Gx interface exists between the P-GW and the H-PCRF, and a Gxb* interface exists between the ePDG and the H-PCRF, and the V-PCRF does not have an interface with the network element of the visited non-3GPP network; Figure 6 shows the WLAN S2c access. There is a Gx interface between the P-GW and the H-PCRF, and the V-PCRF does not have an interface with the visited NEs of the non-3GPP network. Summary of the invention

The technical problem to be solved by the present invention is to provide an S9 sub-session establishment method, system, and PCRF to solve the problem that the S9 sub-session cannot be established when the V-PCRF does not have an interface with the visited mobile network element.

To solve the above technical problem, the present invention provides an S9 sub-session establishment method, which is triggered by a home location policy and a charging rule function (PCRF) to trigger an authenticated PCRF to establish an S9 sub-session, including:

The home PCRF sends the original information related to the establishment of the S9 subsession to the visited PCRF; the visited PCRF receives and generates information related to the S9 subsession according to the original information related to the establishment of the S9 subsession, and establishes an S9 subsession. .

Preferably, the original information related to the establishment of the S9 sub-session is sent by a re-authentication/authorization request (RAR) message.

Preferably, the original information related to the establishment of the S9 sub-session includes: establishing an indication by using an S9 sub-session; and the information related to the S9 sub-session includes sub-session execution information.

Preferably, the home PCRF is subjected to a bearer binding and event reporting function (BBERF), an evolved packet data gateway (ePDG) or a packet data network gateway (P- before transmitting the original information related to the S9 subsession establishment). GW) Trigger of the message sent.

Preferably, the S9 sub-session establishment indication is represented by newly defining a field, or by the local UE IP address in the WLAN scenario, or by the H(e)NB local IP address and/or in the H(e)NB scenario. The UDP port number is indicated.

To solve the above technical problem, the present invention also provides an S9 sub-session establishment system, the system comprising:

a sending module of the home location policy and charging rule function (PCRF), which is set to: to the visited place

The PCRF sends the original information related to the establishment of the S9 subsession;

The receiving module of the visited PCRF is configured to: receive original information related to the establishment of the S9 subsession sent by the home PCRF; The sub-session establishing module of the visited PCRF is configured to: generate S9 sub-session related information according to the original information related to the S9 sub-session establishment, and establish an S9 sub-session.

Preferably, the original information related to the S9 sub-session establishment includes: an S9 sub-session establishment indication; the S9 sub-session related information includes: sub-session execution information.

To solve the above technical problem, the present invention also provides a policy and charging rule function.

(PCRF), the PCRF includes:

a sending module, when the PCRF is located at a home location, it is configured to: send, to the visited PCRF, original information related to the establishment of the S9 subsession;

a receiving module, when the PCRF is located at a visited location, it is configured to: receive the home PCRF to send original information related to the establishment of the S9 subsession;

The sub-session establishing module, when the PCRF is located at the home location, is configured to: generate S9 sub-session related information according to the original information related to the S9 sub-session establishment, and establish an S9 sub-session.

In order to solve the above technical problem, the present invention also provides another S9 sub-session establishing method, which is triggered by the home location policy and the charging rule function (PCRF) to trigger the visited PCRF to establish an S9 sub-session, including:

The home PCRF generates the information related to the S9 subsession when the S9 subsession is established, and sends the information related to the S9 subsession to the visited PCRF.

The visited PCRF receives and establishes an S9 subsession according to the information related to the S9 subsession. Preferably, the S9 sub-session related information is sent by a re-authentication/authorization request (RAR) message.

Preferably, the S9 sub-session related information includes sub-session execution information.

a sub-session establishment decision module of a home policy and a charging rule function (PCRF), which is configured to: generate information related to the S9 sub-session when determining to establish an S9 sub-session; a sending module of the home PCRF, configured to: send, to the visited PCRF, the information related to the S9 subsession;

The receiving module of the visited PCRF is configured to: receive information related to the S9 subsession sent by the home PCRF;

The sub-session establishing module of the visited PCRF is configured to: establish an S9 sub-session according to the information related to the S9 sub-session.

To solve the above technical problem, the present invention also provides a policy and charging rule function (PCRF), the PCRF includes:

a sub-session establishment decision module, where the PCRF is located at the home location, it is set to: generate information related to the S9 sub-session when the S9 sub-session is established by the decision;

a sending module, when the PCRF is located at a home location, it is configured to: send information related to the S9 subsession to the visited PCRF;

a receiving module, when the PCRF is located at a visited location, it is configured to: receive information related to an S9 subsession sent by the home PCRF;

The sub-session establishing module, when the PCRF is located at the visited place, is set to: establish an S9 sub-session according to the information related to the S9 sub-session.

In the embodiment of the present invention, the S9 sub-session establishment method, system, and PCRF trigger the V-PCRF establishment by the home PCRF (ie, H-PCRF) when the visited PCRF (ie, V-PCRF) has no interface with the visited mobile network element. S9 subsession. BRIEF abstract

Figure 1 is the EPS system architecture;

2 is a schematic diagram of a prior art UE accessing a mobile core network through an H(e)NB; FIG. 3 is a roaming architecture in which a UE of the prior art accesses a mobile core network through an H(e)NB; The prior art UE accesses the mobile core network architecture through the non-3GPP network S2b interface. Home routing roaming scene one;

5 is a home routing roaming scenario 2 of a prior art UE accessing a mobile core network architecture through a non-3GPP network S2b interface;

6 is a home routing roaming scenario in which a UE of the prior art accesses a mobile core network architecture through a non-3GPP network S2c interface;

7 is a flow chart of establishing an S9 session initiated by a V-PCRF in the prior art;

FIG. 8 is a first schematic diagram of an S9 session establishment process initiated by an H-PCRF according to an embodiment of the present invention;

FIG. 9 is a second schematic diagram of an S9 session establishment process initiated by an H-PCRF according to an embodiment of the present invention. Preferred embodiment of the invention

The main idea of the S9 sub-session establishment method, system and PCRF of the present invention is that when the visited PCRF (ie, V-PCRF) has no interface with the visited mobile network element, the home PCRF (ie, H-PCRF) triggers V- The PCRF establishes an S9 subsession.

Preferably, the home PCRF triggers the V-PCRF to establish the S9 sub-session. The scheme has the following two schemes: 1. The home PCRF sends the original information related to the establishment of the S9 sub-session when the S9 sub-session is established, and is generated by the visited PCRF. Information related to the S9 subsession, including:

Al) The home PCRF sends the original information related to the establishment of the S9 sub-session to the visited PCRF. In the present invention, the original information related to the establishment of the S9 sub-session includes: S9 sub-session establishment indication. The above-mentioned PDN connection information is used to indicate information indicating a specific PDN connection. It is understood that when a PDN identifier corresponds to only one PDN connection, the PDN connection information refers to a PDN identifier; when a PDN identifier corresponds to several PDN connections The PDN connection information includes a PDN identifier and a PDN connection identifier.

A2) The visited location PCRF receives and generates information related to the S9 subsession according to the original information related to the establishment of the S9 subsession, and establishes an S9 subsession.

In the present invention, the S9 sub-session related information includes sub-session execution information.

Solution 2: When the home PCRF determines to establish an S9 sub-session, the S9 sub-session related information is sent to the visited PCRF for execution, including: Bl) the home PCRF generates the S9 sub-session related information when the decision is made to establish the S9 sub-session, and sends the information to the visited PCRF;

Hi) The visited location PCRF receives and establishes an S9 subsession based on the information related to the S9 subsession.

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the features in the embodiments and the embodiments of the present application may be combined with each other without conflict.

The description of the S9 session establishment in the following embodiments is prior art, and the related content is also described for the sake of solution integrity.

Example 1

This embodiment 1 is mainly to describe the scheme 1 in which the H-PCRF triggers the V-PCRF to initiate the establishment of the S9 sub-session. In the first embodiment, the H-PCRF decides to establish an S9 sub-session, and sends a RAR message to the V-PCRF in the message. Carrying the original information related to the establishment of the S9 sub-session, including: S9 sub-session establishment indication information; As shown in FIG. 8, the process includes:

Step 101: After receiving the message sent by the relevant network element (including: BBERF, ePDG, PCEF, and other network elements), the H-PCRF forwards the related information to the Re-Auth-Request (RAR) message. V-PCRF;

After the H-PCRF receives (message such as: gateway control session establishment request or IP-CAN session establishment request message), the corresponding processing is performed as follows:

The H-PCRF determines whether the S9 session exists according to the user identifier in the received information: 1) if there is an S9 session, the credit control request type is an update request status; if the S9 session exists, further according to the PDN identifier and the PDN connection identifier , to determine whether there is an S9 subsession: If there is no S9 subsession, or if there is an S9 subsession, but the included session binding indication is set to "session deferred binding", then a new S9 subsession needs to be created; 2) if not If there is an S9 session, the credit control request type is the initial request status, the H-PCRF establishes a session indication by sending a request, or includes requesting to establish session identification information to the V-PCRF to create a new S9 session, and also needs to create a new S9 subsession. .

The H-PCRF will be related through a Re-Auth-Request (RAR) message. The information is forwarded to the V-PCRF. If a new S9 sub-session needs to be created, the message contains the following original information related to the establishment of the S9 sub-session: PDN identifier, PDN connection identifier, S9 sub-session establishment indication, session identifier, where PDN identifier The PDN connection identifier may be optionally carried. The message may also include other information in the prior art. When the S9 sub-session is not required, the message may carry QoS installation, sub-session determination information, etc. (refer to TS29.215 for details) ).

The Diameter session identifier is a corresponding Diameter session identifier established by the H-PCRF according to the received gateway control session request message or the IP-CAN session request message, and the Diameter basic protocol ensures that the session identifier is globally unique.

When the H-PCRF receives a new BBERF request message, it may include a session binding indication and is set to "session extension binding", for example: The new gateway control session is associated with the existing gateway control session. IP-CAN session.

When there are multiple PDN connections under one PDN ID, the PDN ID and PDN connection ID represent a PDN connection.

Step 102: After receiving the RAR message, the V-PCRF performs specific processing according to whether the S9 sub-session establishment indication is carried in the RAR message: if not, the normal RAR message processing is performed according to the prior art, and the re-authentication is returned. /Re-Auth- Answer (RAA) message is sent to the H-PCRF; if it is carried, the RAA message is sent back to the H-PCRF, and the message can carry only the Diameter session identifier, wherein the sub-session establishment indication can be newly defined. a field to indicate, or represented by the local UE IP address (WLAN scenario) or H(e)NB local IP address (address) and / or UDP port number (H (e) NB scenario), and continue to step 103;

Step 103: If the R9 message carries the S9 sub-session establishment indication, the V-PCRF sends a credit control request (CC-Request, CCR) message to the H-PCRF, where the message includes information related to the S9 sub-session, including the sub-session execution information. In addition, this message may also contain other information in the prior art.

The V-PCRF establishes the S9 subsession operation principle as follows:

The V-PCRF searches for the corresponding S9 session according to the type of the credit control request in the received request message, and performs corresponding operations:

A) If the credit control request type is an update request status and contains an S9 subsession establishment indication Then, the V-PCRF allocates a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the sub-session operation AVP is also included in the AVP, wherein the sub-session operation AVP is set to the "established" state. If there is session binding indication information, the session binding indication is also included in the sub-session execution AVP. If the PDN identifier and the PDN connection identifier are carried, they are respectively included in the called station identifier AVP and the PDN connection identifier AVP of the sub-session execution information AVP.

B) If the credit control request type is the initial request status, the V-PCRF will create a new S9 session, and if the S9 sub-session establishment indication is included, the V-PCRF will create a new S9 sub-session based on the newly created S9 session. And assigning a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the sub-session operation AVP is also included in the AVP, wherein the sub-session operation in the sub-session execution information is set to the "established" state. If the PDN identifier and the PDN connection identifier are carried, they are respectively included in the called station identifier AVP and the PDN connection identifier AVP of the sub-session execution information AVP.

Step 104: The H-PCRF receives the CCR message, and replies to the V-PCRF with a CC-Answer (CCA) message, where the message includes policy-related information, such as: Diameter session identifier, sub-session decision information;

The H-PCRF is identified by the Diameter session, and the H-PCRF confirms that the request initiated by the V-PCRF is related to step 101, and according to the information acquired from the V-PCRF and other user-related information acquired from the Diameter session, the PCC policy is formulated, and the V- The PCRF replies to a CC-Answer (CCA) message, which includes policy-related information, such as: Diameter session identifier, sub-session decision information.

The H-PCRF associates the S9 sub-session with the corresponding Diameter session, where the Diameter session includes: a gateway control session, an IP-CAN session.

After receiving the credit control response message, the V-PCRF forwards the relevant policy to the associated network element according to the sub-session decision information in the message, including: BPCF.

In the above embodiment, the H-PCRF and the V-PCRF interact through the existing RAR and RAA messages, and alternatively, the information may be transmitted through the newly added message.

In order to implement the above solution, the present invention also provides a system for establishing an S9 sub-session, the system comprising a sending module of a home policy and a charging rule function (PCRF), and receiving by a visited PCRF. Module and visit sub-session establishment module of PCRF, where:

a sending module of the home policy and charging rule function (PCRF), configured to send the original information related to the establishment of the S9 subsession to the visited PCRF;

The original information related to the establishment of the S9 sub-session includes: an S9 sub-session establishment indication.

Preferably, the Diameter session identifier is a corresponding Diameter session identifier established by the home PCRF according to the received gateway control session request message or the IP-CAN session request message.

The receiving module of the visited PCRF is configured to receive original information related to the establishment of the S9 subsession sent by the home PCRF;

The sub-session establishing module of the visited PCRF is configured to generate S9 sub-session related information according to the original information related to the S9 sub-session establishment, and establish an S9 sub-session.

Preferably, the home PCRF further includes a message sending triggering module, configured to send a bearer binding and event reporting function (BBERF), an evolved packet data gateway (ePDG), or a packet data network gateway (P-GW). After the message, the sending module is triggered to send information.

In addition, the present invention further provides a policy and charging rule function (PCRF), where the PCRF includes a sending module, a receiving module, and a subsession establishing module, where:

a sending module, when the PCRF is located at the home location, used to send the original information related to the establishment of the S9 subsession to the visited PCRF;

Preferably, the original information related to the establishment of the S9 sub-session is re-authenticated/authorized by the request

( RAR ) message sent.

The original information related to the establishment of the S9 sub-session includes an S9 sub-session establishment indication.

As described above, the Diameter session identifier is a corresponding Diameter session identifier established by the home PCRF according to the received gateway control session request message or the IP-CAN session request message.

a receiving module, when the PCRF is located at a visited location, for receiving original information related to the establishment of the S9 subsession sent by the home PCRF;

a sub-session establishing module, where the PCRF is located at the time of visiting, and is used to establish a sub-session according to the S9 The relevant original information is generated to generate information related to the S9 sub-session, and an S9 sub-session is established. Preferably, the PCRF further includes a message sending triggering module, where the PCRF is located at the home location, and is configured to receive a bearer binding and event reporting function (BBERF), an evolved packet data gateway (ePDG), or a packet data network gateway (P). After the message is sent by the GW, the sending module is triggered to send the message.

Example 2

The second embodiment of the present invention is mainly to describe the second scenario in which the H-PCRF triggers the V-PCRF to initiate the establishment of the S9 sub-session. In the second embodiment, after the H-PCRF is triggered by the message of the relevant network element, the parameter carried according to the received message is The information is determined by the S9 sub-session, and the information related to the S9 sub-session is generated, and the RAR message is sent to the V-PCRF, where the message carries the information related to the S9 sub-session, including: sub-session execution information; The H-PCRF generates information related to the S9 sub-session. As shown in FIG. 9, the process specifically includes:

Step 201: After receiving the message sent by the relevant network element (for example, the gateway control session establishment request or the IP-CAN session establishment request message), the H-PCRF determines to establish an S9 sub-session, and adds the generated information related to the S9 sub-session to the Sending to the V-PCRF in the RAR message;

The message includes: Subsession execution information.

The H-PCRF decision establishes the S9 sub-session, and the specific decision-making principles are as follows:

The H-PCRF searches for the corresponding S9 session of the UE according to the user identifier in the received request message, and performs corresponding operations:

A) If there is an S9 session, the credit control request type is an update request status; if the request message does not include the PDN connection identifier and the PDN identifier, the existing S9 session related information is updated, and if the request message is a new gateway Controlling the session request, and when searching for a gateway control session associated with the user ID, the multiple BBERF action AVP is set to the "established" state and the access network gateway address AVP is set, including the AVP at the command level; otherwise, based on these The information finds whether the corresponding S9 subsession already exists in the PDN connection, and performs the corresponding operation:

A1. If the corresponding S9 subsession cannot be found, the H-PCRF will assign a new one.

The S9 sub-session identifier is included in the sub-session execution information AVP, and the AVP also includes a sub-session operation AVP, etc., wherein the sub-session operation AVP is set to the "established" state.

A2. If you can find the corresponding S9 sub-session, the specific operations are divided into the following cases: a. When the H-PCRF receives the request message of the new gateway control session, the session binding indication is set to "session extension binding", and according to the PDN identifier and the PDN connection identifier, it is associated with a gateway control session, then The H-PCRF allocates a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the sub-session operation AVP is also included in the AVP, wherein the sub-session operation AVP is set to the "established"state;

b. When the H-PCRF receives a new BBERF request message and the new gateway control session is associated with the existing IP-CAN session with the existing gateway control session, but there is no "session extension binding indication", then V - The PCRF modifies the existing S9 sub-session related information, wherein the sub-session operation information is set to the "modified" state; the multi-BBERF action AVP (set to "establish" state) and the access network gateway address AVP are also included in the sub-session Execute in the AVP.

c. When the H-PCRF receives an IP-CAN session request, the V-PCRF modifies the existing one.

S9 sub-session related information, wherein the sub-session operation information is set to a "modified" state.

B) If there is no S9 session, the H-PCRF will create a new S9 session, the credit control request type is the initial request status, and further determine whether the PDN connection identifier and the PDN identifier are included (for example: S2a interface, S5/S8 GTP/PMIP) The S2b interface scenario carries the information. If it is included, the H-PCRF allocates a new S9 sub-session identifier, which is included in the sub-session execution information AVP, and the AVP also includes the sub-session operation AVP. The sub-session operation AVP is set to the "established" state.

In addition, if the PDN identifier and the PDN connection identifier are carried, they are respectively included in the called station identifier AVP and the PDN connection identifier AVP of the subsession execution information AVP.

Step 202: After receiving the RAR message, the V-PCRF performs specific processing according to the state of the sub-session operation information in the RAR message. If the status of the sub-session operation information is "modified", the normal RAR message is performed according to the prior art. Processing, and replying to the RAA message to the H-PCRF; if the status of the sub-session operation information is "established", then replying to the Re-Auth-Answer (RAA) message to the H-PCRF, the message may only Carry the session identifier and proceed to step 203.

Step 203: After receiving the RAR message, the V-PCRF extracts information related to the S9 sub-session from the RAR message, performs an establishment operation of the S9 sub-session, and sends a CCR message to the H-PCRF, where the message includes sub-session execution information. Step 204: The H-PCRF formulates a PCC policy, and returns a CCA message to the V-PCRF, where the message includes policy related information.

The H-PCRF receives the CCR message, and the H-PCRF confirms that the request initiated by the V-PCRF is related to step 201, and formulates the PCC according to the information acquired from the V-PCRF and other user-related information acquired from the Diameter session. The policy returns a CCA message to the V-PCRF, where the message includes policy-related information, such as: session identifier, sub-session decision information.

After receiving the CCA message, the V-PCRF forwards the related policy to the associated network element according to the sub-session decision information in the message, including: BPCF.

In order to implement the foregoing Embodiment 2, the present invention further provides an S9 sub-session establishing system, which includes a sub-session establishment decision module of a home location policy and a charging rule function (PCRF), a sending module of a home PCRF, and a visited place. a receiving module of the PCRF and a sub-session establishing module of the visited PCRF, wherein:

a sub-session establishment decision module of the Home Policy and Charging Rules Function (PCRF), configured to generate information related to the S9 sub-session when the S9 sub-session is established by the decision;

The sending module of the home PCRF is configured to send, to the visited PCRF, information related to the S9 subsession;

Preferably, the S9 sub-session related information is sent by a re-authentication/authorization request (RAR) message.

The receiving module of the visited PCRF is configured to receive information related to the S9 subsession sent by the home PCRF;

The sub-session establishing module of the visited PCRF is configured to establish an S9 sub-session according to the information related to the S9 sub-session.

Preferably, the home PCRF further includes a sub-session decision triggering module, configured to receive a bearer binding and event reporting function (BBERF), an evolved packet data gateway (ePDG), or a packet data network gateway (P-GW). After the message is sent, the sub-session establishment decision module is triggered to make a decision. In addition, the present invention also provides a policy and charging rule function (PCRF), the PCRF includes:

a sub-session establishing decision module, where the PCRF is located at the home location, and is used to generate information related to the S9 sub-session when the S9 sub-session is determined to be established;

a sending module, where the PCRF is located at the home location, and used to send the S9 sub-session related information to the visited PCRF;

a receiving module, when the PCRF is located at a visited location, used to receive information related to the S9 subsession sent by the home PCRF;

a sub-session establishing module, where the PCRF is located at the visited place, and is used to establish an S9 sub-session according to the information related to the S9 sub-session.

Further, the PCRF further includes a sub-session decision triggering module, where the PCRF is located at the home location, and is used to receive a bearer binding and event reporting function (BBERF), an evolved packet data gateway (ePDG), or a packet data network. After the message sent by the gateway (P-GW), the sub-session establishment decision module is triggered to make a decision.

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.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. Industrial applicability

In the embodiment of the present invention, the S9 sub-session establishment method, system, and PCRF trigger the V-PCRF establishment by the home PCRF (ie, H-PCRF) when the visited PCRF (ie, V-PCRF) has no interface with the visited mobile network element. S9 subsession.

Claims

Claim

An S9 sub-session establishment method, which is triggered by a home location policy and a charging rule function (PCRF) to trigger an authenticated PCRF to establish an S9 sub-session, including:

The home PCRF sends the original information related to the establishment of the S9 subsession to the visited PCRF; the visited PCRF receives and generates according to the original information related to the establishment of the S9 subsession.

S9 sub-session related information, and establish an S9 sub-session.

2. The method of claim 1, wherein the original information related to the establishment of the S9 subsession is sent by a Reauthentication/Authorization Request (RAR) message.

The method according to claim 1, wherein the original information related to the establishment of the S9 sub-session includes: an S9 sub-session establishment indication; and the S9 sub-session related information includes sub-session execution information.

The method according to claim 1, wherein the home PCRF is subjected to a bearer binding and event reporting function (BBERF) before transmitting the original information related to the establishment of the S9 subsession.

The method of claim 3, wherein: the S9 sub-session establishment indication is represented by a newly defined field, or is represented by a local UE IP address in a WLAN scenario, or an H(e)NB scenario. Next, represented by the H(e)NB local IP address and/or UDP port number.

6. An S9 sub-session establishment system, the system comprising:

a sending module of the Home Policy and Charging Rules Function (PCRF), configured to: send the original information related to the establishment of the S9 subsession to the visited PCRF;

The receiving module of the visited PCRF is configured to: receive original information related to the establishment of the S9 subsession sent by the home PCRF; and

The sub-session establishing module of the visited PCRF is configured to: generate S9 sub-session related information according to the original information related to the S9 sub-session establishment, and establish an S9 sub-session.

7. The system of claim 6, wherein the original related to the establishment of the S9 subsession The information includes: an S9 sub-session establishment indication; the S9 sub-session related information includes: sub-session execution information.

8. A policy and charging rule function (PCRF), the PCRF comprising:

The PCRF according to claim 8, wherein the original information related to the establishment of the S9 sub-session includes: an S9 sub-session establishment indication; and the information related to the S9 sub-session includes: sub-session execution information.

10. An S9 sub-session establishment method, where the home location policy and the charging rule function (PCRF) trigger the visited PCRF to establish an S9 sub-session, including:

The visited PCRF receives and establishes an S9 subsession according to the information related to the S9 subsession.

11. The method of claim 10, wherein the S9 sub-session related information is sent by a Re-authentication/Authorization Request (RAR) message.

The method according to claim 10, wherein the information related to the S9 sub-session includes sub-session execution information.

13. An S9 subsession establishment system, the system comprising:

a sub-session establishment decision module of the Home Policy and Charging Rules Function (PCRF), which is configured to: generate information related to the S9 sub-session when the S9 sub-session is determined to be established;

a sending module of the home PCRF, configured to: send the S9 to the visited PCRF Subsession related information;

14. The system of claim 13, wherein the S9 sub-session related information comprises sub-session execution information.

15. A Policy and Charging Rules Function (PCRF), the PCRF comprising:

The PCRF according to claim 15, wherein the S9 sub-session related information includes sub-session execution information.