WO2012010036A1

WO2012010036A1 - Policy control method and system

Info

Publication number: WO2012010036A1
Application number: PCT/CN2011/076155
Authority: WO
Inventors: 毕以峰; 霍玉臻; 王志海; 蒋陶
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-23
Filing date: 2011-06-22
Publication date: 2012-01-26
Also published as: CN102340757A; CN102340757B

Abstract

A policy control method and system are provided by the present invention, for solving the technical problem of establishing a policy session, setting the dynamic policy for a fixed network, and finally implementing the unified management of mobile network resources and fixed network resources. With the invention, after an IP-Connectivity Access Network (IP-CAN) session is established, a Policy and Charging Rules Function (PCRF) and a Broadband Forum Policy Control Function (BPCF) are triggered to establish an interworking policy session for a UE; the fixed network policy session and the interworking policy session are associated by the BPCF; the BPCF obtains the related policy for the UE from the PCRF by the interworking policy session; therefore, the invention achieves the object of setting the dynamic policy for the fixed network and performing the unified management of the mobile network resources and the fixed network resources.

Description

Strategy control method and system

The present invention relates to the field of mobile communication and fixed network communication, and in particular to a method and system for controlling a policy under a mobile network and a fixed network convergence architecture. Background technique

The Evolved Packet System (EPS) of the 3rd Generation Partnership Project (3GPP) evolved by the 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 AAA server (3GPP authentication and authorization accounting server), Policy and Charging Rules Function (PCRF) entity and other supporting nodes. See the upper box section of Figure 1. The MME is responsible for control plane related operations such as mobility management, non-access stratum signaling processing, and user mobility management context management; the S-GW is an access gateway device connected to the E-UTRAN, in the E-UTRAN and the PDN. The data is forwarded between the GWs and is responsible for buffering the paging wait data. The P-GW is a border gateway of the 3GPP evolved packet system and PDN (Packet Data Network), which is responsible for PDN access and forwarding data between EPS and PDN.

When the UE accesses through the E-UTRAN, the GTP can be used between the S-GW and the P-GW.

The (GPRS Tunneling Protocol) protocol can also use the Proxy Mobile IPv6 (PMIPv6) protocol. At the same time, the EPS can implement interworking with non-3GPP networks, that is, the UE can also access the EPS through the non-3GPP access network, and the P-GW functions as the 3GPP and the non-3GPP network. Anchor between the two. The non-3GPP system can be further divided into trusted non-3GPP IP access and untrusted non-3GPP IP access. The fixed network can be used as a trusted non-3GPP IP access to access the P-GW of the EPS system through the gateway X-MAG. The interface between the X-MAG and the P-GW is called an S2a excuse, and the PMIPv6 protocol is used. GTP protocol.

The lower part of the dotted line shown in Figure 1 is the fixed network access part of the mobile fixed network convergence architecture. The fixed network part mainly includes a network element RG (Routing Gateway), an AN (Access Network, an access network, including a DSLAM (Digital Subscriber Line Access Multiplexer), and an ONT (Optical Network Terminal). , optical network terminal) and other network elements), BNG (Broadband Network Gateway), BRAS (Broadband Remote Access Server), and BBF AAA (Broadband Forum AAA, Broadband Forum Authentication and Authorization Accounting Server) ), BPCF (Broadband Forum Policy Control Function), and so on.

The fixed network is a trusted non-3GPP access part of the 3GPP EPS system, and is connected to the P-GW of the EPS system through the interworking network element X-MAG. The interworking NEs X-MAG and P-GW are connected through the S2a interface. After the user accesses the user data, the user data passes through the fixed network and the X-MAG network element, and reaches the external PDN (for example, the Internet or the carrier enterprise network, etc.) via the P-GW of the EPS core network. The X-MAG is only a code name of the interworking network element. In different networks, it can be called a different name, but its function is the same.

BNG/BRAS, BBF AAA, and 3GPP HSS/AAA implement authentication and authorization for user access. BNG/BRAS, BPCF, and 3GPP PCRF manage and control fixed network resources.

In the fixed network, in order to describe each interface conveniently, in this specification, we use the two endpoint network elements of each interface as the name of each interface (only valid in this manual), for example: BNG/BRAS and BBF The interface between AAA is called: (BNG/BRAS-BBF AAA) interface, the interface between BNG/BRAS and BPCF is called: (BNG/BRAS-BPCF) interface, and so on. Push.

In the EPS system, the Policy and Charging Enforcement Function (PCEF) exists in the P-GW, and the PCRF and the P-GW exchange information through the Gx interface. When the interface between the S-GW and the P-GW is based on the PMIPv6, the S-GW resides in the Bearer Binding and Event Reporting Function (BBERF), and the S-GW and the PCRF pass. The Gxc interface exchanges information. The fixed network policy and charging control is formulated by BPCF and implemented by BNG/BRAS. Currently, EPS network and fixed network convergence require unified management of policies and billing. .

However, when a UE accesses an EPS network through a fixed network, how to establish a policy session, how to obtain a dynamic policy on a fixed network, how to report an event, and finally how to implement unified management of mobile network resources and fixed network resources by the PCRF is a problem to be solved. Summary of the invention

In view of this, the main object of the present invention is to provide a policy control method and system for solving a policy session establishment, formulating a dynamic policy for a fixed network, and finally realizing a technical problem of uniformly managing mobile network resources and fixed network resources.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A policy control method, the method comprising:

When the user equipment (UE) accesses the fixed network, the broadband forum policy control function entity (BPCF) establishes a fixed network policy session for the UE;

When the UE is attached to an Evolved Packet System (EPS), a Packet Data Network Gateway (P-GW) and a Policy and Charging Rules Function (PCRF) establish an IP Connection Access Network (IP-CAN) session for the UE;

The establishing of the IP-CAN session triggers the PCRF and the BPCF to establish an interworking policy session for the UE;

The BPCF associates the fixed network policy session with the interworking policy session, the BPCF According to a preferred embodiment of the present invention, the method further includes: after the UE is attached to the EPS network, if an additional packet data network (PDN) connection establishment process is initiated, the P-GW and the PCRF establish the Additional PDN-connected IP-CAN session;

The PCRF establishes an interworking policy session with the BPCF for the additional PDN connection; the BPCF associates a fixed network policy session for the UE with an interworking policy session for the additional PDN connection;

The BPCF obtains the related policy of the access UE from the PCRF through an interworking policy session for the additional PDN connection.

Further, the BPCF associates the fixed network policy session with the interworking policy session by:

The BPCF associates the fixed network policy session and the interworking policy session according to the fixed network information obtained from the PCRF and the fixed network information obtained from the fixed network policy session establishment process; the fixed network information The method includes one or more of the following information: a fixed network ID of the UE, an IP address allocated by the fixed network to the UE, an IP address converted by the network address, and a user data protocol (UDP) port number;

The manner of the association is specifically one of the following ways or any combination:

(1) correlating according to the fixed network ID of the UE;

(2) correlating the IP address assigned by the fixed network to the UE/the IP address converted by the network address plus the UDP port number;

(3) correlating according to the fixed network ID of the UE and the IP address assigned by the fixed network to the UE/the IP address converted by the network address plus the UDP port number.

Based on a preferred embodiment of the present invention, the method further includes:

After the UE is attached to the EPS network, if an additional PDN connection establishment process is initiated, P-GW establishes an IP-CAN session with the PCRF for the additional PDN connection; the PCRF associates an IP-CAN session for the additional PDN connection to an interworking policy session between the existing PCRF and BPCF;

The PCRF sends the related policy for the access user to the BPCF through the existing interworking policy session.

Further, before the PCRF associates the IP-CAN session for the additional PDN connection to the interworking policy session between the existing PCRF and the BPCF, the method further includes:

The PCRF looks up an existing interworking policy session for the UE and determines if there is an existing interworking policy session that conforms to the IP-CAN session for the additional PDN connection, if any, for the additional PDN The connected IP-CAN session is associated with the existing interworking policy session; otherwise, an interworking policy session between the PCRF and the BPCF is created;

Determining that the existing interworking policy session meets the IP-CAN session for the additional PDN connection is one of the following conditions or any combination:

(1) The fixed network IDs of the UEs of the two sessions are the same;

(2) The IP address assigned to the UE by the fixed network of the two sessions / the IP address after the network address translation plus the UDP port number is the same;

(3) The fixed network ID of the UE of the two sessions and the IP address assigned by the fixed network to the UE / the IP address converted by the network address plus the UDP port number are the same;

(4) The fixed network user IDs of the two sessions are the same and the access types are fixed network access modes. Further, when the fixed network policy session is established, the fixed network information of the UE is sent to the BPCF;

When attaching to the EPS/establishing an additional PDN connection, the UE sends the fixed network information of the UE to the P-GW through the fixed network signaling and the PBU signaling, and the P-GW performs the IP-CAN session when the IP-CAN session is established. The fixed network information of the UE is sent to the PCRF. When the PCRF initiates the interworking policy session establishment operation, the fixed network information of the UE is sent to the BPCF. The fixed network information is sent to the P-GW by setting a new option in fixed network signaling and PBU signaling or by using existing PCO parameters.

Further, the broadband forum policy control function entity BPCF establishes a fixed network policy session for the UE: BPCF and the broadband network gateway BNG/broadband remote access server BRAS establishes a fixed network policy session for the UE.

Based on the method of the present invention, a policy control system is further provided, the system comprising: a policy enforcement entity (BNG/BRAS), BPCF, P-GW, PCRF;

The policy enforcement entity is configured to send a fixed network policy session establishment request to the BPCF when the UE accesses the fixed network, and establish a fixed network policy session with the BPCF;

The P-GW is configured to send an IP-CAN session establishment signaling to the PCRF when the UE is attached to the EPS, and establish an IP-CAN session with the PCRF;

After the IP-CAN session is established, the PCRF is further configured to trigger an interworking policy session with the BPCF for the UE.

The BPCF is further configured to associate the fixed network policy session with the interworking policy session, and further, the BPCF is obtained according to the fixed network information obtained from the PCRF and the establishment process from the fixed network policy session. The fixed network information is associated with the fixed network policy session and the interworking policy session; the fixed network information includes one or more of the following information: a fixed network ID of the UE, an IP address allocated by the fixed network to the UE, and a IP address after network address translation plus user data protocol (UDP) port number;

The association method is specifically one of the following methods or any combination:

(1) correlating according to the fixed network ID of the UE;

(3) an IP address assigned to the UE according to the fixed network ID of the UE and a fixed network The IP address after the address conversion is associated with the UDP port number.

After the IP-CAN session is established, the PCRF and the BPCF are triggered to establish an interworking policy session for the UE, and the BPCF associates the fixed network policy session with the interworking policy session, and the BPCF obtains the related policy of the UE from the PCRF through the interworking policy session. Thus, the invention aims to develop a dynamic strategy for the fixed network and uniformly manage the mobile network resources and the fixed network resources. DRAWINGS

1 is a diagram of a fixed network mobile convergence architecture according to the prior art;

Figure 2 is a flow chart of Embodiment 1 of the present invention;

Figure 3 is a flow chart of the second embodiment of the present invention;

Figure 4 is a flow chart of the third embodiment of the present invention;

Figure 5 is a flow chart of the fourth embodiment of the present invention. detailed description

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. .

In the embodiment of the present invention, the BNG/BRAS of the fixed network establishes a fixed network policy session with the BPCF as an example to illustrate the invention, but does not exclude other network element entities in the fixed network from establishing a fixed network policy session with the BPCF, or other The possibility that the network element performs the BPCF function, for example, the BNG/BRAS triggers the BBF AAA to establish a fixed network policy session with the BPCF, or the function of the BPCF is implemented on the BBF AAA, and the BNG/BRAS establishes a fixed network policy session with the BBF AAA. The same applies to such a scenario. Moreover, the session may be an association relationship between two network elements that is identified by a unified session ID, or may be a signaling of a transmission policy that is distinguishable between two network elements.

In the embodiment of the present invention, a fixed network policy enforcement entity (such as BNG/BRAS) and BPCF The session between the policy and the event notification is called a fixed network policy session. The session between the PCRF and the BPCF for delivering policy and event notification is called an interworking policy session. The specific name can be defined in the implementation.

Embodiment 1:

2 is a flowchart of establishing an attach/attach PDN connection of a terminal accessing an EPS through a fixed network according to the present invention, and the fixed network is a trusted non-3GPP access of the EPS network, wherein the flowchart includes various scenarios such as roaming and non-roaming.

In this embodiment, when the UE accesses/attaches to the fixed network, the BNG/BRAS initiates a fixed network policy session establishment process; after the UE accesses/attaches to the EPS network, the PDN connection (including default and proprietary) is established. The P-GW initiates an IP-Connect (IP-Connectivity Access Network) session establishment process, and the triggered PCRF initiates an interworking policy session establishment process. After the session is established, BPCF associates/associates the interworking policy session with the fixed network policy session through the relevant mechanism. The mechanism is as follows:

When the UE accesses the fixed network, the UE sends the fixed network information of the user to the BPCF when the authentication, the local connection establishment, and the fixed network policy session are established; when the UE attaches to the EPS/establishes an additional PDN connection, the UE fixes the fixed network information. Sending to the P-GW through the PCO, the P-GW sends the fixed network information of the user to the PCRF when establishing the IP-CAN session; when the PCRF triggers the BPCF to establish an interworking policy session, the fixed network information of the user is sent to The BPCF associates/associates the interworking policy session with the fixed network policy session according to the fixed network information, and the BPCF obtains the related policy of the user from the PCRF through the interworking policy session.

The fixed network policy session between BNG/BRAS and BPCF is unique for each UE, and the interworking policy session between BPCF and PCRF and the IP-CAN session between P-GW and PCRF are unique for each PDN connection. A UE can establish multiple PDN connections, that is, an interworking policy session and multiple IP-CAN sessions between multiple BPCFs and PCRFs. Therefore, at the BPCF, between the fixed network policy session between BGN/BRAS and BPCF and between BPCF and PCRF The interworking policy session is a one-to-many association.

The detailed steps are described as follows:

Step 201: The terminal UE passes the authentication according to the fixed network authentication mode.

Step 202: The terminal UE establishes a local connection with the fixed network, and obtains a local IP address assigned by the fixed network (IP 1)

Step 203: Upon being triggered by the local connection establishment step and/or the authentication step, the BNG/BRAS initiates a fixed network policy session establishment request to the BPCF. Through this step, the BNG/BRAS establishes a session for applying/delivering a dynamic policy with the BPCF to achieve accurate control of network resource allocation and user admission.

In this step, the BNG/BRAS sends the fixed network information to the BPCF. The fixed network information includes a fixed network ID of the UE and/or an IP address allocated by the fixed network to the UE, and may also include a port number and a protocol type other than the IP. If the BNG/BRAS does not receive the IP address of the UE, but the NAT is converted in the middle, the converted IP address and the User Datagram Protocol (UDP) port number are reported to the BPCF.

Step 204: The terminal sends a Layer 3 negotiation request to the X-MAG, where the request is fixed network signaling, where the UE carries the UE mobile network ID, APN (Access Point Name, access point name) and other parameters.

The PCO (Protocol Configuration Option) in the signaling carries the fixed network information. The PCO is a parameter set between the UE and the P-GW, and transparently transmits the access network and the X-MAG.

Step 205: The user accesses the mobile network authentication. Use 3GPP-based authentication methods (such as:

EAP-AKA) Completes access authentication for the user.

Step 206: After receiving the Layer 3 negotiation request signaling, the X-MAG parses the IP address (IP 1) allocated by the fixed network carried in the signaling, or obtains the UE from the IP header of the encapsulated signaling. The IP address obtained by the network (IP 1 or NAT translated IP address and UDP port number), and the corresponding relationship of the subsequently established PMIPv6 tunnel. XM AG acts as the mobile anchor gateway for PMIPv6. A Proxy Binding Update (PBU) message is sent to the P-GW to request tunnel binding with the P-GW.

The PCO is used as a parameter set for transparent transmission of the X-MAG. The X-MAG does not parse it, and sends it directly to the P-GW through the PBU message.

Step 207: After receiving the PBU message, the P-GW allocates an IP address (IP 2) to the terminal. The P-GW establishes an IP-CAN session -1 with the PCRF.

The P-GW obtains the PCO and parses out the fixed network information, and sends the signaling to the PCRF through the IP-CAN session-1.

The PCRF formulates a PCC (Policy and Charging Control) policy based on the fixed network information and the mobile network information sent by the P-GW to the PCRF. The mobile network information includes: an IP address (IP 2 ), a port number, a protocol type, and the like allocated by the EPS network to the UE.

Step 208: The P-GW sends an APN/P-GW identity pair to the 3GPP HSS/AAA through Diameter signaling, and stores the identifier of the P-GW.

Step 209: The P-GW responds to the X-MAG network element with a Proxy Binding Acknowledgement (PBA) message, and carries the IP address (IP 2) assigned to the terminal in the message.

Step 210: The X-MAG network element completes the Layer 3 negotiation with the UE, sends the IP address (IP 2) of the terminal to the UE, or sends the message to the UE through other messages.

Step 211: The triggering of step 207, the PCRF initiates an interworking policy session establishment operation between the PCRF and the BPCF, and issues a related policy.

During the session establishment process, the PCRF sends the fixed network information obtained from the P-GW to the BPCF. Step 212: After establishing an interworking policy session with the PCRF, the BPCF associates the fixed network policy session with the interworking policy session between the BPCF and the PCRF according to the fixed network information obtained from the PCRF and the fixed network information obtained in step 203.

The fixed network information includes one or more of the following information: a fixed network identifier (ID) of the UE, The IP address assigned by the fixed network to the UE and the IP address obtained by the fixed network for the UE to be assigned by the network address plus the UDP port number.

The manner of association may be one of the following schemes or any combination:

1. The BPCF associates the two sessions according to the same fixed network ID of the UE of the two sessions;

2. The BPCF associates the two sessions according to the IP address assigned to the UE by the fixed network of the two sessions or the IP address + UDP port number after the network address translation (NAT);

3. The BPCF only has the same fixed network ID for the UEs of the two sessions, and the IP address assigned by the fixed network to the UE/the IP address after NAT conversion + the UDP port number are also the same, and the two sessions are associated;

If the relevant policy is issued at the PCRF, BPCF will update the policy to BNG/BRAS according to the actual situation, and BNG/BR AS will perform corresponding operations according to the updated policy.

Step 213: The first PDN connection is successfully established, and the data packet transmission starts.

Step 214: From this step, the UE starts to establish an additional PDN connection, that is, a second PDN connection.

The terminal sends a Layer 3 negotiation request to the X-MAG. In the signaling, the UE carries the mobile network ID, and the APN (which may be different from the APN when the first PDN connection is established) and other parameters.

The PCO in the signaling carries/or does not carry fixed network information. The PCO is a set of parameters between the UE and the P-GW, and transparently transmits the access network and the X-MAG.

Step 215: After receiving the Layer 3 negotiation request signaling, the X-MAG parses the IP address (IP 1) allocated by the fixed network UE carried in the signaling, or obtains the UE from the IP header of the encapsulated signaling. The IP address obtained by the network (IP 1 or NAT translated IP address and UDP port number), and the corresponding relationship between the established PMIPv6 tunnel. The X-MAG acts as the PMIPv6 Mobile Access Gateway (MAG) and sends a PBU message to the P-GW to request tunnel binding with the P-GW.

The PCO is used as a parameter set for transparent transmission of X-MAG. The X-MAG does not parse it, and sends it directly to the P-GW through the PBU message. (The P-GW here is the P-GW when the first PDN connection is established. Not the same P-GW, or the same P-GW). Step 216: After receiving the PBU message, the P-GW allocates an IP address (IP 3) to the terminal. The P-GW establishes an IP-CAN Session-2 with the PCRF.

The P-GW obtains the PCO and parses out the fixed network information, and sends the signaling to the PCRF through the IP-CAN session-2. Or if the PCO does not carry the fixed network information, the P-GW does not send the fixed network information to the PCRF when establishing the IP-CAN session -2.

The PCRF formulates a PCC policy based on the fixed network information and the mobile network information sent by the P-GW to the PCRF. The mobile network information includes: an IP address (IP 3 ), a port number, and a protocol type allocated by the EPS network to the UE.

Step 217: The P-GW sends an APN/P-GW identity pair to the 3GPP HSS/AAA through Diameter signaling, and stores the identifier of the P-GW.

Step 218: The P-GW responds to the X-MAG network element with a PBA message, and carries the IP address (IP 3) assigned to the terminal in the message.

Step 219: The X-MAG network element completes the Layer 3 negotiation with the UE, sends the IP address (IP 3) of the terminal to the UE, or sends the message to the UE through other messages.

Step 220: The triggering of the step 216, the PCRF initiates an interworking policy session establishment operation between the PCRF and the BPCF, and issues the related policy.

During the session establishment process, the PCRF sends the fixed network information obtained from the P-GW to the BPCF. If the PCRF does not acquire the fixed network information when establishing the IP-CAN session with the P-GW, the PCRF finds the fixed network information stored by the UE through the mobile network ID of the UE (obtained when the first PDN connection is established), and sends Give BPCF.

Step 221: After establishing an interworking policy session with the PCRF, the BPCF associates the fixed network policy session with the interworking policy session between the BPCF and the PCRF according to the fixed network information obtained from the PCRF and the fixed network information obtained in step 203. The association method is the same as step 212.

If the relevant policy is issued at the PCRF, the BPCF will update the policy to the BNG/BRAS according to the actual situation, and the BNG/BR AS will perform the corresponding operation according to the updated policy. Step 222: The second PDN connection is successfully established, and the data packet transmission is started. At this point, at the BPCF, two BPCFs establish an interworking policy session with the PCRF and associate with the fixed network policy session between the BNG/BRAS and the BPCF.

Note: The UE may also establish other additional PDN connections by following the steps in steps 214-222 after the above operations. The session association mechanism is the same as above.

Embodiment 2

FIG. 3 is a flowchart of establishing an attach/attach PDN connection of a terminal accessing an EPS through a fixed network according to the present invention, and a trusted non-3GPP access of the fixed network as an EPS network, wherein the flowchart includes various scenarios such as roaming and non-roaming.

In this embodiment, when the UE accesses/attaches to the fixed network, the BNG/BRAS initiates a fixed network policy session establishment process; when the UE accesses/attaches to the EPS network and establishes the first PDN connection (default), P- The GW initiates an IP-CAN session establishment process, and the triggered PCRF initiates an interworking policy session establishment process, and then an additional PDN connection is established. The PCRF and the BPCF reuse the established interworking policy session, and only need to apply the session to deliver the message. Just fine. After the session is established, BPCF associates/associates the interworking policy session with the fixed network policy session through the relevant mechanism. The mechanism is as follows:

When the UE accesses the fixed network, the UE sends the fixed network information of the user to the BPCF when the authentication, the local connection establishment, and the fixed network policy session are established; when the UE attaches to the EPS/establishes an additional PDN connection, the UE fixes the fixed network information. The P-GW is sent to the P-GW through the PCO. The P-GW sends the IP-CAN session to the PCRF. When the PCRF triggers the BPCF to establish an interworking policy session, the fixed network information is sent to the BPCF. The BPCF exchanges the policy session according to the fixed network information. The fixed network policy session is mapped/associated.

The interworking policy session between the BNG/BRAS and the BPCF and the interworking policy session between the BPCF and the PCRF are unique for each UE, and the IP-CAN session between the P-GW and the PCRF is for each PDN connection. Uniquely, one UE can establish multiple PDN connections, ie one UE can have multiple IP-CAN sessions. So at BPCF, IP-CAN session and BPCF The interworking policy session with the PCRF is a many-to-one association.

The detailed steps are described as follows:

Steps 301-319 are the same as steps 201-219;

Step 320: The triggering of step 316, the PCRF searches for the interworking policy session between the PCRF and the BPCF that has been established according to the fixed network information carried in step 316 or the ID of the mobile network, and determines whether the IP-CAN session is met. If there is a match, associate the IP-CAN session with the existing interworking policy session between the PCRF and BPCF; if not, create an interworking policy session between the PCRF and BPCF.

Since here is an additional PDN connection setup operation, an 'interaction policy session' between the PCRF and the BPCF has been established when the previous attach/default PDN connection is established, so the PCRF will associate the IP-CAN session to the existing one. On the 'Intercommunication Policy Session,', and trigger step 321.

The condition that the interworking policy session between the PCRF and the BPCF conforms to the IP-CAN session may be one of the following conditions or any combination:

1. The PCRF has the same fixed network ID according to the UE of the two sessions;

2. The IP address assigned by the PCRF to the UE according to the fixed network of the two sessions / the IP address after NAT conversion + the UDP port number are the same;

3. The PCRF is based on the same fixed network ID of the UE in both sessions, and the IP address assigned by the fixed network to the UE / the IP address after NAT conversion + the UDP port number are also the same;

4. The PCRF has the same fixed network ID according to the two sessions and the access type is fixed network access. Step 321: The PCRF sends the relevant policy to the BPCF through the interworking policy session. The BPCF updates the policy to the BNG/BRAS according to the actual situation, and the BNG/BRAS performs the corresponding operation according to the updated policy.

Step 322: The second PDN connection is successfully established, and data packet transmission starts.

At this point, at the BPCF, there are two IP-CAN sessions corresponding to the same BPCF to establish an interworking policy session with the PCRF, and the BPCF establishes an interworking policy session with the PCRF and BNG/BRAS and BPCF. The fixed network policy session is - the corresponding relationship.

The UE may also re-establish a third, fourth, etc., multiple additional PDN connections by following the steps 314-322 after the above operations. The session association mechanism is the same as above.

Embodiment 3:

FIG. 4 is a flowchart of establishing an attach/add-on PDN connection of another terminal to access an EPS through a fixed network according to the present invention. The embodiment is similar to the first embodiment, and the specific difference lies in steps 405, 406, 408, 416, and 417. Step 418. In the first embodiment, the fixed network message is carried to the P-GW through the PCO parameters in the Layer 3 negotiation request signaling and the PBU message, so that the PCO is a transparent transmission access network (fixed network), and there is no access network. In this embodiment, the fixed network information is transmitted by the UE to the P-GW through the Layer 3 negotiation request message and the extended field option in the PBU message; or the message is requested by the X-MAG from the Layer 3 negotiation request signaling. The fixed network information is parsed in the encapsulation header, and then brought to the P-GW through the extended option of the PBU message. The above three layers of negotiation messages, PBU messages, and X-MAG network elements are required to support this function extension.

In step 405 and step 406, the method for the UE to send and the X-MAG to acquire the fixed network information may be as follows:

Method 1. Step 405: The fixed network information option is extended in the signaling, and is parsed by the X-MAG in step 406.

Mode 2: Step 405: The fixed network information option is not extended in the signaling. In step 406, the fixed network information is parsed by the X-MAG from the encapsulation header of the signaling. For example, the X-MAG takes out the destination address, source address, destination port number, and source port number of the Layer 3 negotiation request signaling as fixed network information.

Mode 3: The combination of the foregoing two methods, that is, the option is extended in step 405, and part of the fixed network information is carried, and in step 406, XM AG parses part of the fixed network information from the extended option, and then encapsulates the signaling. Another part of the fixed network information is parsed in the header, thereby forming all the fixed network information.

Step 416 and step 417 can be implemented with reference to steps 405 and 406. Embodiment 4:

FIG. 5 is a flowchart of establishing an attach/additional PDN connection of another terminal through a fixed network to an EPS provided by the present invention. The embodiment is similar to the second embodiment, and the specific difference lies in steps 505, 506, 508, 516, and 517. 518 steps. In the second embodiment, the fixed network message is carried to the P-GW through the PCO parameters in the Layer 3 negotiation request signaling and the PBU message, so that the PCO is transparently transmitted to the access network (fixed network), and is not available to the access network. In this embodiment, the fixed network information is transmitted by the UE to the P-GW through the Layer 3 negotiation request message and the extended field option in the PBU message; or the message is requested by the X-MAG from the Layer 3 negotiation request signaling. The fixed network information is parsed in the encapsulation header and then brought to the P-GW through the extended option of the PBU message. The above three layers of negotiation messages, PBU messages, and X-MAG network elements support this function extension.

The steps 505 and 506 and the steps 516 and 517 can refer to the implementations of the steps 405 and 405 in the embodiment 4, and details are not described herein again.

The above embodiments 1 to 2 are all for the case of using the PMIPv6 protocol between the X-MAG and the P-GW. If the GTP protocol is used between the X-MAG and the P-GW, the method is also applicable, that is, the X-MAG. The type of interface between the P-GW and the P-GW does not affect the invention. From the flowchart, the only difference is that the proxy binding update message is changed to create a session request message, and the proxy binding acknowledge message is changed to create a session acknowledgement message.

Embodiment 5:

The present invention provides a policy control system for a terminal to access an EPS through a fixed network, the system comprising: a policy enforcement entity, a BPCF, a P-GW, and a PCRF;

The policy enforcement entity is a BNG or a BRAS, and is configured to send a fixed network policy session establishment request to the BPCF when the UE accesses the fixed network, and establish a fixed network policy session with the BPCF;

The P-GW is configured to send an IP-CAN session establishment signaling to the PCRF when the UE attaches to the EPS, and establish an IP-CAN session with the PCRF;

The IP-CAN session establishment process triggers the PCRF and the BPCF to establish an interworking policy for the UE. Word

The BPCF associates the fixed network policy session with the interworking policy session, and obtains a related policy of the UE from the PCRF through the interworking policy session.

The BPCF associates the fixed network policy session and the interworking policy session by: the BPCF associates the fixed network policy session and the interworking policy according to the fixed network information obtained from the PCRF and the fixed network information obtained from the fixed network policy session establishment process. The fixed network information includes one or more of the following information: a fixed network ID of the UE, an IP address allocated by the fixed network to the UE, an IP address converted by the network address, and a UDP port number;

Specifically, the BPCF performs the association by using one or a combination of the following manners: (1) performing association according to the fixed network ID of the UE;

Further, when the UE accesses the fixed network, when the authentication, the local connection establishment, and the fixed network policy session are established, the fixed network information of the UE is sent to the BPCF;

When attaching to the EPS/establishing an additional PDN connection, the UE sends the fixed network information of the UE to the P-GW through Layer 3 negotiation signaling and PBU signaling, where the P-GW establishes an IP-CAN session. The fixed network information of the UE is sent to the PCRF; when the PCRF triggers the establishment of the interworking policy session, the fixed network information of the UE is sent to the BPCF.

The above 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

The present invention provides a policy control method and system. After the IP-CAN session is established, the PCRF and the BPCF are triggered to establish an interworking policy session for the UE, and the BPCF associates the fixed network policy session with the interworking policy session, and the BPCF passes The interworking policy session obtains the related policies of the UE from the PCRF, thereby achieving the purpose of formulating a dynamic policy for the fixed network, and uniformly managing the mobile network resources and the fixed network resources.

Claims

Claim

A method for controlling a policy, the method comprising:

When the user equipment UE accesses the fixed network, the broadband forum policy control function entity BPCF establishes a fixed network policy session for the UE;

When the UE attaches to the evolved packet system EPS, the packet data network gateway P-GW and the policy and charging rule function PCRF establish an IP connection access network IP-CAN session for the UE; establishment of the IP-CAN session Trimming the PCRF and the BPCF to establish an interworking policy session for the UE;

The BPCF associates the fixed network policy session with the interworking policy session, the BPCF

2. The method according to claim 1, wherein the method further comprises:

After the UE is attached to the EPS network, if an additional packet data network PDN connection establishment procedure is initiated, the P-GW establishes an IP-CAN session with the PCRF for the additional PDN connection; the PCRF establishes a target for the BPCF An interworking policy session for attaching a PDN connection; the BPCF associating a fixed network policy session for the UE with an interworking policy session for the additional PDN connection;

The method according to claim 1 or 2, wherein the BPCF associates the fixed network policy session with the interworking policy session by:

The BPCF associates the fixed network policy session and the interworking policy session according to the fixed network information obtained from the PCRF and the fixed network information obtained from the fixed network policy session establishment process; the fixed network information Including one or more of the following information: the fixed network ID of the UE, the IP address assigned by the fixed network to the UE, the IP address converted by the network address, and the user data protocol (UDP) end Slogan

The manner of association is one of the following ways or any combination:

(1) correlating according to the fixed network ID of the UE;

4. The method according to claim 1, wherein the method further comprises:

After the UE is attached to the EPS network, if an additional PDN connection establishment procedure is initiated, the P-GW establishes an IP-CAN session with the PCRF for the additional PDN connection;

The PCRF associates an IP-CAN session for the additional PDN connection to an interworking policy session between the existing PCRF and BPCF;

5. The method according to claim 4, wherein before the PCRF associates the IP-CAN session for the additional PDN connection to an interworking policy session between the existing PCRF and the BPCF, the method further includes:

(1) The fixed network IDs of the UEs of the two sessions are the same;

(2) The IP address assigned to the UE by the fixed network of the two sessions/IP address after the network address translation The address plus the UDP port number is the same;

(4) The fixed network user IDs of the two sessions are the same and the access types are fixed network access modes.

The method according to claim 1, wherein, when the fixed network policy session is established, the fixed network information of the UE is sent to the BPCF;

When attaching to the EPS/establishing an additional PDN connection, the UE sends the fixed network information of the UE to the P-GW through the fixed network signaling and the PBU signaling, and the P-GW performs the IP-CAN session when the IP-CAN session is established. The fixed network information of the UE is sent to the PCRF. When the PCRF initiates the interworking policy session establishment operation, the fixed network information of the UE is sent to the BPCF.

7. The method according to claim 6, wherein the fixed network information is sent to the P-GW by setting a new option in fixed network signaling and PBU signaling or by using an existing PCO parameter.

8. The method according to claim 1, wherein the broadband forum policy control function entity BPCF establishes a fixed network policy session for the UE, and the BPCF and the broadband network gateway BNG/broadband remote access server BRAS are UEs. Establish a fixed network policy session.

9. A policy control system comprising: a policy enforcement entity BNG/BRAS, BPCF, P-GW, PCRF, characterized in that

The BPCF is further configured to associate the fixed network policy session with the interworking policy session, and

10. The system according to claim 9, wherein

The BPCF associates the fixed network policy session with the interworking policy session according to the fixed network information obtained from the PCRF and the fixed network information obtained from the fixed network policy session establishment process; the fixed network information includes the following One or more of the information: a fixed network ID of the UE, an IP address assigned by the fixed network to the UE, an IP address converted by the network address, and a user data protocol (UDP) port number; the associated method is One or any combination of the following:

(1) correlating according to the fixed network ID of the UE;

11. The system of claim 10, wherein

When the fixed network policy session is established, the fixed network information of the UE is sent to the BPCF; when attaching to the EPS/establishing an additional PDN connection, the UE passes the fixed network information of the UE through the fixed network message. Sending the PBU signaling to the P-GW, where the P-GW sends the fixed network information of the UE to the PCRF when establishing an IP-CAN session; when the PCRF triggers the establishment of the interworking policy session And transmitting the fixed network information of the UE to the BPCF.