WO2013020451A1

WO2013020451A1 - Session establishment method and system

Info

Publication number: WO2013020451A1
Application number: PCT/CN2012/079112
Authority: WO
Inventors: 芮通; 朱春晖; 周晓云
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-08-08
Filing date: 2012-07-24
Publication date: 2013-02-14
Also published as: CN102932915B; CN102932915A

Abstract

The present invention provides a session establishment method and system. The method comprises: if a UE performs access through a trusted non-3GPP network, after the UE completes authentication in the non-3GPP network, a trusted non-3GPP access gateway, or a 3GPP AAA or a BBF AAA Proxy sending a message to a centralized deployment functional architecture (BPCF), the message indicating that it is unnecessary to establish an S9* session; and upon receiving the message, the BPCF determining, according to the indication carried in the message, that it is unnecessary to establish an S9* session with a policy and charging rules function (PCRF). By means of the present invention, the reliability of session establishment is improved.

Description

TECHNICAL FIELD The present invention relates to the field of mobile communications, and in particular, to a method and system for establishing a session. BACKGROUND OF THE INVENTION The 3rd Generation Partnership Project (3GPP) evolved packet system

(Evolved Packet System, EPS) Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Mobility Management Entity (MME), Serving Gateway (S) -GW), Packet Data Network Gateway (P-GW or PDN GW), Home Subscriber Server (HSS), 3GPP Authenticated Authorization and Accounting (AAA) server, The Policy and Charging Rules Function (PCRF) entity and other supporting nodes are composed. FIG 1 is a schematic diagram of the EPS system architecture related art, in FIG. 1, a mobility management entity responsible for control plane related work mobility management, non-access stratum signaling processing and user mobility management context management; _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 packet data network (Packet Data) Network, PDN) The border gateway of the network, responsible for PDN access and forwarding data between EPS and PDN; S-GW and P-GW are both core network gateways; PCRF receives interface Rx and carrier network protocol (Internet) Protocol, IP) The service network is connected to obtain the service information. In addition, it is connected to the gateway device in the network through the Gx/Gxa/Gxc interface, and is responsible for initiating the establishment of the IP bearer to ensure the quality of service (QoS) of the service data. And perform billing control.

The EPS supports interworking with non-3GPP systems, wherein interworking with non-3GPP systems is implemented through an 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 systems are classified into trusted non-3GPP IP access and untrusted non-3GPP IP access. Trusted non-3GPP IP access can be directly connected to the P-GW through the S2a interface; untrusted non-3GPP IP access needs to be connected to the P-GW through the Evolved Packet Data Gateway (ePDG), ePDG and P- The interface between the GWs is S2b. The S2c provides user plane-related control and mobility support between the user equipment (User Equipment, UE) and the P-GW. The supported mobility management protocol is dual IPv2 mobile IPv6 support. Mobile IPv6 Support for Dual Stack Hosts and Routers, DSMIPv6). In the EPS system, a Policy and Charging Enforcement Function (PCEF) entity exists in the P-GW, and a Gx interface (see FIG. 1) between the PCRF and the P-GW exchanges information. When the interface between the P-GW and the S-GW is based on PMIPv6, the S-GW also has a Bearer Binding and Event Report Function (BBERF) entity to perform QoS control on the service data flow, S-GW. Information is exchanged with the PCRF via the Gxc interface (see Figure 1). When accessed through a trusted non-3GPP access system, the BBERF is also resident in the trusted non-3GPP access gateway. The trusted non-3GPP access gateway exchanges information with the PCRF through the Gxa interface (see Figure 1). When the UE roams, the S9 interface functions as an interface between the home PCRF and the visited PCRF, and provides the application function (AF) of the service to the UE, and sends the policy and charging control to the PCRF through the Rx interface (Policy and Charging Control, PCC) Business information of the strategy. In 3GPP, the corresponding PDN network can be found through an Access Point Name (APN). A connection from a UE to a PDN network is typically referred to as an IP Connectivity Access Network (IP-CAN) session. During the establishment of the IP-CAN session, the BBERF and the PCEF respectively establish a Diameter session with the PCRF, and the policy charging information for controlling the IP-CAN session and the information for formulating the policy are transmitted through the Diameter sessions. The corresponding BBF (Broadband Forum Broadband Forum) proposed the broadband policy control architecture BPCF

(Centralized Deployment Functional Architecture centralized deployment functional architecture), Figure 2 is a schematic diagram of the BBF BPCF architecture. As shown in Figure 2, the main function of BPCF is to formulate corresponding policies; the Policy Enforcement Point (PEF) usually resides in the solid state. In the network transmission device, for example, the Broadband Remote Access Server (BRAS)/BNG (Broadband Network Gateway) is executed according to the corresponding policy formulated by the BPCF; authentication, Authorization Authorization and Accounting (AAA) storage User subscription information, Application Function (AF), formulate policies for BPCF and provide corresponding business information. The existing BPCF architecture is still relatively rough, and the relevant details are still being further developed. At present, the Fixed Mobile Convergence (FCC) scenario that operators pay attention to is based on the research on 3GPP and BBF interconnection. The scenario in which the user accesses the mobile core network through the BBF fixed network is a non-3GPP access mode. For this non-3GPP access mode, it is subdivided into two categories:

1. Untrusted non-3GPP access mode, Figure 3 is a schematic diagram of the UE accessing the EPS core network through untrusted non-3GPP. As shown in Figure 3, the UE needs to access the EPS core network through ePDG, ePDG and P-GW. The inter-S2b interface can use the Proxy Mobile IP (PMIP) protocol, and the admission control (eg, admission control of bandwidth resources) is completed by the S9* session between the PCRF in the mobile core network and the BPCF in the BBF network. 2. Trusted non-3GPP access mode, the GTP protocol is adopted between the trusted non-3GPP access gateway and the P-GW, and FIG. 4 is a schematic diagram of the UE accessing the EPS core network through the trusted non-3GPP, as shown in FIG. It is shown that there is no ePDG network element at this time, and the S2a interface between the trusted non-3GPP access gateway and the P-GW can use the GTP protocol. Due to the use of the GTP protocol, the QoS parameters can be sent by the P-GW through the GTP tunnel. A trusted non-3GPP access gateway, so it is not required to pass the S9*. If both the GTP tunnel and the S9* session pass the QoS parameters, a resource conflict will occur, and when the QoS parameters passed by the GTP tunnel and the S9* session are inconsistent, , can lead to system errors, which is not conducive to system stability. SUMMARY OF THE INVENTION The present invention provides a method and system for establishing a session, which can avoid resource conflicts and improve system stability. The technical solution of the present invention is implemented as follows: A method for establishing a session, including: when a user equipment UE accesses through a trusted non-3GPP network, when the UE completes authentication in a non-3GPP network, the trusted non The 3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy sends a message to the centralized deployment function architecture BPCF, the message indicating that the S9* session does not need to be established; after receiving the message, the BPCF receives the indication according to the message , determine that there is no need to establish an S9* session to the policy and charging rule function PCRF. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF is a session setup message or an access notification message. The message indicates that the S9* session does not need to be established: the message carries a trusted non-3GPP access and/or GTP tunnel indication. The message indicates that the S9* session does not need to be established: the message carries the UE identifier, and the BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the BPCF carries the message according to the message. The UE identifier knows the operator of the network to which the user belongs, and determines that the S9* session is not required to be established to the PCRF according to the subscription information between the operators. The message indicates that the S9* session does not need to be established: the message does not carry the UE identifier, and the BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the message does not carry the UE identifier. , determine that there is no need to establish an S9* session to the PCRF. A system for establishing a session, including a BPCF, and a trusted non-3GPP access gateway, or a 3GPP AAA, or a BBF AAA Proxy; wherein the trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy, configured to send a message to the BPCF after the UE completes the authentication in the non-3GPP network, the message indicating that the S9* session does not need to be established; the BPCF is set to receive the non-3GPP connection from the trusted After entering the gateway, or the message of the 3GPP AAA, or the BBF AAA Proxy, according to the indication carried in the message, it is determined that the S9* session is not required to be established to the policy and charging rule function PCRF. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF is a session setup message or an access notification message. The message sent by the trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message carries a trusted non-3GPP access and/or GTP tunnel indication. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message carries the UE identifier, and the BPCF is carried according to the message. The indication that the S9* session is not required to be established to the PCRF is: The BPCF learns the operator of the network to which the user belongs according to the UE identifier carried in the message, and determines that the S9* is not required to be established to the PCRF according to the subscription information between the operators. Conversation. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message does not carry the UE identifier, and the BPCF is carried according to the message. The indication is that the S9* session is not required to be established to the PCRF: the message does not carry the UE identifier, and it is determined that the S9* session is not required to be established to the PCRF. The method and system for establishing a session according to the present invention, when the user equipment UE accesses through a trusted non-3GPP network, after the UE completes the authentication in the non-3GPP network, the trusted non-3GPP access gateway, or 3GPP AAA, or The BBF AAA Proxy sends a message to the centralized deployment function architecture BPCF, where the message indicates that the S9* session does not need to be established; after receiving the message, the BPCF determines that the policy and charging rules are not required according to the indication carried in the message. The function PCRF establishes an S9* session. With the present invention, when the UE accesses through the untrusted 3GPP, an S9* session is established between the BPCF and the PCRF, and when the UE accesses through the trusted non-3GPP, and When the GTP tunneling protocol is adopted, no S9* session is established between the BPCF and the PCRF, so that resource conflicts can be avoided and system stability can be improved. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a system architecture of an EPS according to the related art; FIG. 2 is a schematic diagram of a BBF BPCF architecture; FIG. 3 is a schematic diagram of a UE accessing an EPS core network through untrusted non-3GPP; 3 is a schematic diagram of a method for establishing a session according to the present invention; FIG. 6 is a schematic flowchart of a method for establishing a session according to Embodiment 1 of the present invention; and FIG. 7 is a schematic flowchart of a method for establishing a session according to Embodiment 2 of the present invention; . DETAILED DESCRIPTION When a UE accesses through untrusted 3GPP, an S9* session between BPCF and PCRF is needed, and when the UE accesses through a trusted non-3GPP and adopts the GTP tunneling protocol, BPCF and PCRF There can be no S9* sessions. For the above two different access methods, how does the BPCF determine whether it is necessary to establish an S9* session becomes a problem to be solved by the present invention. In the application, when the UE accesses through a trusted non-3GPP network, after the UE completes the authentication in the non-3GPP network, the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy is deployed to the centralized deployment. The function architecture BPCF sends a message indicating that the S9* session does not need to be established. After receiving the message, the BPCF determines that the S9* session is not required to be established to the policy and charging rule function PCRF according to the indication carried in the message. FIG. 5 is a schematic flowchart of a method for establishing a session according to the present invention. As shown in FIG. 5, the method includes: Step 501: After a UE accesses a non-3GPP network through a trusted non-3GPP network, Trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy

The BPCF sends a message indicating that there is no need to establish an S9* session. Step 502: After receiving the message, the BPCF determines, according to the indication carried in the message, that the S9* session is not required to be established to the PCRF. In step 501, the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy, after the UE completes the authentication, knows that the BPCF does not need to establish an S9* session to the PCRF, and therefore does not need to establish an S9* session notification to the BPCF. In step 501, an existing message (such as a session establishment message, an access notification message, etc.) may be extended to notify the BPCF that the S9* session does not need to be established, or the new message may be used to notify the BPCF that the S9* session does not need to be established. In step 501, the message may indicate that the S9* session does not need to be established, for example, the message carries a trusted non-3GPP access and/or a GTP tunnel indication (the two indications may be combined into one type: The 3GPP access uses the GTP tunnel indication); the message may also be an implicit manner indicating that the S9* session does not need to be established. For example, the message carries the UE identifier (generally referred to as the UE identifier in the mobile network), and the BPCF learns the user according to the user identifier. The operator of the home network determines whether the S9* session needs to be established to the PCRF according to the subscription information between the operators. For example, if the message does not carry the UE identifier, the BPCF does not need to The PCRF establishes an S9* session. It should be noted that, in the present invention, when the 3GPP AAA sends a message to the BPCF, the message is generally sent to the BBF AAA Proxy, and then the BBF AAA Proxy sends the message to the BPCF. The present invention also correspondingly proposes a system for establishing a session, including a BPCF, and a trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy; wherein the trusted non-3GPP access gateway, or 3GPP AAA , or BBF AAA Proxy, set to

After completing the authentication of the non-3GPP network, the UE sends a message to the BPCF indicating that the S9* session does not need to be established; the BPCF is set to receive the trusted non-3GPP access gateway, or 3GPP AAA. After the message of the BBF AAA Proxy, according to the indication carried in the message, it is determined that the S9* session is not required to be established to the policy and charging rule function PCRF. The message sent by the trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy to the BPCF is a session setup message or an access notification message. The message sent by the trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message carries a trusted non-3GPP access and/or GTP tunnel indication. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message carries the UE identifier, and the BPCF is carried according to the message. The indication that the S9* session is not required to be established to the PCRF is: The BPCF learns the operator of the network to which the user belongs according to the UE identifier carried in the message, and determines that the S9* is not required to be established to the PCRF according to the subscription information between the operators. Conversation. The message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF indicates that the S9* session does not need to be established: the message does not carry the UE identifier, and the BPCF is carried according to the message. The indication is that the S9* session is not required to be established to the PCRF: the message does not carry the UE identifier, and it is determined that the S9* session is not required to be established to the PCRF. The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to understand the invention. . Embodiment 1 In this embodiment, the UE accesses through a trusted non-3GPP mode, for example, the non-3GPP access gateway at this time may be a BRAS (BRAS Broadband Remote Access Server) / BNG (Broadband Network Gateway), when the UE completes the connection. After the authentication is performed, the trusted non-3GPP access gateway sends a session establishment to the BPCF, and the message carries an indication that the BPCF does not need to establish an S9* session to the PCRF. The indication manner may be an explicit manner: the message carries a trusted connection. Indication and/or GTP tunnel indication; also implicit: By not carrying the UE identity (mobile network), BPCF is therefore unable to establish an S9* session to the PCRF. After receiving the message, the BPCF determines whether it is necessary to establish an S9* session to the PCRF according to the indication. Specifically, FIG. 6 is a schematic flowchart of a method for establishing a session according to Embodiment 1 of the present invention. As shown in FIG. 6, the method includes: Step 601: A UE accesses a mobile core network through a trusted non-3GPP manner, and the non-3GPP at this time The access gateway can be a BRAS/BNG. Step 602: The UE performs authentication, and the authentication passes through a trusted non-3GPP access gateway. Step 603: The UE initiates a layer 3 attachment, and the step may also be initiated after step 609. Step 604: After the authentication succeeds, the trusted non-3GPP access gateway establishes a session with the BPCF, and the message carries an indication that the BPCF does not need to establish an S9* session to the PCRF. The indication carried may be an explicit manner: The carrying of the trusted access identifier and/or the GTP tunnel indication may also be an implicit manner: by carrying the UE identifier (mobile network), the BPCF learns the operator of the network to which the user belongs based on the user identifier, and determines whether the S9 needs to be established. * Session, or without carrying the UE identity (mobile network), BPCF does not need to establish an S9* session to the PCRF. Step 605: The BPCF determines, according to the indication, that the access is a trusted non-3GPP access and/or adopts a GTP tunneling protocol, so there is no need to establish an S9* session to the PCRF. Step 606: The trusted non-3GPP access gateway initiates a session establishment request to the P-GW. Step 607: The P-GW establishes a Gx session to the PCRF, and the PCRF formulates a PCC policy and sends the policy to the P-GW. Step 608: The P-GW updates the P-GW address to the 3GPP AAA/BBF AAA Proxy. Step 609: The P-GW returns a response to the trusted non-3GPP access gateway, where the response message carries the QoS information. Step 610: The trusted non-3GPP access gateway initiates admission control to the BPCF, and the message carries the corresponding

QoS information. Embodiment 2 In this embodiment, the UE accesses through a trusted non-3GPP mode, for example: the non-3GPP access gateway at this time may be a BRAS/BNG, and after the UE completes the access authentication, the 3GPP AAA/BBF AAA PROXY to the BPCF Sending an access notification message, the message carries an indication that the BPCF does not need to establish an S9* session to the PCRF, and the indication manner may be an explicit manner: the message carries a trusted access identifier and/or a GTP tunnel indication; Implicit way: By not carrying the UE identity (mobile network), BPCF is therefore unable to establish an S9* session to the PCRF. After receiving the message, the BPCF determines whether it is necessary to establish an S9* session to the PCRF according to the indication. Specifically, FIG. 7 is a schematic flowchart of a method for establishing a session according to Embodiment 2 of the present invention. As shown in FIG. 7, the method includes: Step 701: A UE accesses a mobile core network through a trusted non-3GPP manner, and the non-3GPP at this time The access gateway can be a BRAS/BNG. Step 702: The UE performs authentication, and the authentication passes through a trusted non-3GPP access gateway. Step 703: The UE initiates a layer 3 attachment, and the step may also be initiated after the ninth step. Step 704a: After the authentication succeeds, the 3GPP AAA/BBF AAA PROXY sends an access notification message to the BPCF, and the message carries an indication that the BPCF does not need to establish an S9* session to the PCRF. The carried indication may be an explicit manner: The message carries the trusted access identifier and/or the GTP tunnel indication. It can also be an implicit mode. By carrying the UE identifier (mobile network), the BPCF learns the operator of the network to which the user belongs based on the user identifier, and determines whether it needs to be established. The S9* session, or the UE ID (mobile network), does not need to establish an S9* session with the PCRF. Step 704b: The trusted non-3GPP access gateway establishes a session with the BPCF. This step can also occur in step 10, establishing a session to the BPCF when the trusted non-3GPP access gateway has an admission control request. Step 705: The BPCF determines, according to the indication, that the access is a trusted non-3GPP access and/or adopts a GTP tunneling protocol, so there is no need to establish an S9* session to the PCRF. Step 706: The trusted non-3GPP access gateway initiates a session establishment request to the P-GW. Step 707: The P-GW establishes a Gx session to the PCRF, and the PCRF formulates a PCC policy and sends it to the P-GW. Step 708: The P-GW updates the P-GW address to the 3GPP AAA/BBF AAA PROXY. Step 709: The PGW returns a response to the trusted non-3GPP access gateway, where the response message carries the QoS information. Step 710: The trusted non-3GPP access gateway initiates admission control to the BPCF, and the message carries corresponding QoS information. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A request for rights, a method of establishing a session, the method comprising:

In case the user equipment UE accesses through the trusted non-3rd Generation Partnership Project 3GPP network, after the UE completes the authentication in the non-3GPP network, the trusted non-3GPP access gateway, or the 3GPP Authentication Authorization Accounting Server AAA , or the broadband forum authentication and authorization charging agent BBF AAA Proxy sends a message to the centralized deployment function architecture BPCF, the message indicating that an S9* session does not need to be established;

After receiving the message, the BPCF determines that it is not necessary to establish an S9* session to the policy and charging rule function PCRF according to the indication carried in the message. The method according to claim 1, wherein the message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF is a session establishment message or an access notification message. The method according to claim 1 or 2, wherein the message indicates that the S9* session does not need to be established: the message carries a trusted non-3GPP access and/or a universal data transmission platform protocol GTP tunnel indication. The method according to claim 1 or 2, wherein the message indicates that the S9* session does not need to be established: the message carries the UE identifier,

The BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the BPCF learns the operator of the network to which the user belongs according to the UE identifier carried in the message, and further signs the contract according to the carrier. The information decision does not require an S9* session to be established to the PCRF. The method according to claim 1 or 2, wherein the message indicates that the S9* session does not need to be established: the message does not carry the UE identifier,

The BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the message does not carry the UE identifier, and it is determined that the S9* session is not required to be established to the PCRF. A system for establishing a session, the system comprising a BPCF and one of the following: a trusted non-third generation partnership program 3GPP access gateway, a 3GPP authentication and authorization accounting server AAA, a broadband forum authentication authorization charging agent BBF AAA Proxy ; among them, The trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy, is configured to send a message to the centralized deployment function architecture BPCF after the UE completes the authentication in the non-3GPP network, the message indicating that the S9 does not need to be established. *session;

The BPCF is configured to determine, after receiving the message from the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy, according to the indication carried in the message, that the policy and charging rule are not required The function PCRF establishes an S9* session. The system according to claim 6, wherein the message sent by the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy to the BPCF is a session establishment message or an access notification message. The system according to claim 6 or 7, wherein the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy sends a message to the BPCF indicating that the S9* session does not need to be established: the message Carry a trusted non-3GPP access and/or GTP tunnel indication. The system according to claim 6 or 7, wherein the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy sends a message to the BPCF indicating that the S9* session does not need to be established: the message Carry the UE logo,

The BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the BPCF learns the operator of the network to which the user belongs according to the UE identifier carried in the message, and further signs the contract according to the carrier. The information decision does not require an S9* session to be established to the PCRF. 0. The system according to claim 6 or 7, wherein the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy sends a message to the BPCF indicating that the S9* session does not need to be established: The message does not carry the UE identifier.

The BPCF determines that the S9* session is not required to be established to the PCRF according to the indication carried in the message: the message does not carry the UE identifier, and it is determined that the S9* session is not required to be established to the PCRF. 1. A system for establishing a session, the system comprising a BPCF and one of the following: a trusted non-third generation partnership program 3GPP access gateway, a 3GPP authentication authorization charging server AAA, a broadband forum authentication authorization charging agent BBF AAA Proxy; where

The trusted non-3GPP access gateway, or 3GPP AAA, or BBF AAA Proxy, is configured to send a message to the centralized deployment function architecture BPCF after the UE completes the authentication in the non-3GPP network, the message indicating that the S9 does not need to be established. * Conversation. A system for establishing a session, the system comprising a centralized deployment functional architecture BPCF and one of the following: a trusted non-third generation partnership program 3GPP access gateway, a 3GPP authentication authorization accounting server AAA, a broadband forum authentication authorization charging Agent BBF AAAProxy; where,

The BPCF is configured to determine, after receiving the message from the trusted non-3GPP access gateway, or the 3GPP AAA, or the BBF AAA Proxy, according to the indication carried in the message, that the policy and charging rule are not required The function PCRF establishes an S9* session.