WO2009086734A1 - 非漫游场景下策略和计费规则功能实体的选择方法 - Google Patents

非漫游场景下策略和计费规则功能实体的选择方法 Download PDF

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Publication number
WO2009086734A1
WO2009086734A1 PCT/CN2008/002064 CN2008002064W WO2009086734A1 WO 2009086734 A1 WO2009086734 A1 WO 2009086734A1 CN 2008002064 W CN2008002064 W CN 2008002064W WO 2009086734 A1 WO2009086734 A1 WO 2009086734A1
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WIPO (PCT)
Prior art keywords
session
pcrf
dra
policy
entity
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PCT/CN2008/002064
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English (en)
French (fr)
Inventor
Tong RUI
Zaifeng Zong
Xiaoyun Zhou
Jinguo Zhu
Jun Song
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Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to US12/812,044 priority Critical patent/US8438290B2/en
Priority to EP08870505.8A priority patent/EP2242205A4/en
Publication of WO2009086734A1 publication Critical patent/WO2009086734A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/14—Charging, metering or billing arrangements for data wireline or wireless communications
    • H04L12/1403—Architecture for metering, charging or billing
    • H04L12/1407—Policy-and-charging control [PCC] architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0894—Policy-based network configuration management

Definitions

  • the present invention relates to a method for selecting a policy and charging rule function entity in an EPC (Evolved Packet Core) network architecture of the 3GPP (3GPP) 3rd Generation Partnership Project. Background technique
  • the 3GPP evolved packet system (EPS, Evolved Packet System) consists of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), a Mobility Management Entity (MME), and a Serving Gateway (S- GW, Serving Gateway), Packet Data Network Gateway (P-GW), Home Subscriber Server (HSS), 3GPP Authentication Authorization Accounting (AAA), Policy and Accounting
  • EPS Evolved Packet System
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • HSS Home Subscriber Server
  • AAA 3GPP Authentication Authorization Accounting
  • Policy and Accounting Policy and Accounting
  • PIDF Policy and Charging Rules Function
  • 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 P-GW forwards data and is responsible for buffering paging wait data.
  • the P-GW is a border gateway of the 3GPP EPS and Packet Data Network (PDN), which is responsible for accessing the PDN and forwarding data between the EPS and the PDN.
  • PDN Packet Data Network
  • the PCRF is a policy and charging rule function entity, which interacts with the operator's IP service interface (AF, Application Function) through the Rx interface to obtain service information; and through the S7/S7a/S7c and the gateway device in the network (S-GW, The P-GW is connected, and is responsible for initiating the establishment of an IP bearer, guaranteeing the quality of service (QoS) of the service data, and performing charging control.
  • AF Operator's IP service interface
  • S-GW gateway device in the network
  • EPS supports interworking with non-3GPP networks
  • the P-GW acts as an anchor between 3GPP and non-3GPP networks.
  • the non-3GPP system is divided into trusted non-3GPP IP access and untrusted non-3GPP IP access.
  • Trusted non-3GPP IP access can directly interface with P-GW through S2a; untrusted non-3GPP IP access requires evolved packet data gateway (ePDG, Evolved Packet Data Gateway) and P-GW
  • ePDG evolved packet data gateway
  • P-GW evolved packet data gateway
  • PCEF Policy and Charging Enforcement Function
  • the interface between the P-GW and the S-GW is based on the Packet Mobile Internet Protocol (PMIP), and the policy execution function part of the PCEF function is also It exists in the S-GW and is called the Gateway Control Function (GWCF, Gateway Control Function), such as the binding function of the bearer.
  • PMIP Packet Mobile Internet Protocol
  • GWCF Gateway Control Function
  • the S-GW exchanges information with the PCRF through the S7c interface (see Figure 1).
  • the trusted non-3GPP access system accesses the interworking between the S2a and the 3GPP system, the GWCF also resides in the trusted non-3GPP access gateway, as shown in FIG.
  • PCRF nodes there are multiple PCRF nodes in a public land mobile network (PLMN) of EPS, and all PCRF nodes belong to one or more Diameter (PCRF) domains, and all PCRFs in a Diameter (PCRF) domain are equal.
  • a UE-to-PDN connection is called an IP-Connected Session Network (IP-CAN, IP Connectivity Access Network) session.
  • IP-CAN IP Connected Session Network
  • PCC Policy and Charging Control
  • the EPS introduces a logical functional entity in each Diameter (PCRF) domain, namely the Diameter Routing Agent (DRA). , Diameter Routing Agent ) Network element.
  • DRA Diameter Routing Agent
  • the 3GPP core network uses the EPC architecture
  • the existing EPS does not make any specific plan for the DRA selection PCRF for the above three situations of the UE in the non-roaming scenario.
  • the policy execution function part exists in multiple network elements such as the S-GW and the P-GW (GWCF, PCEF)
  • GWCF the P-GW
  • PCEF the policy execution function part exists in multiple network elements such as the S-GW and the P-GW
  • the prior art needs to be solved: how to associate all PCEFs, GWCFs, and AFs related to one IP-CAN session of the UE by the DRA in the non-roaming scenario of the UE. Go to the same PCRF.
  • the technical problem to be solved by the present invention is to provide a method for selecting a policy and charging rule function entity in a non-roaming scenario, which enables the DRA to be in the non-roaming scenario, all PCEF, GWCF and AF related to the IP-CAN session of the UE in the non-roaming scenario. Both are associated with the same PCRF.
  • the present invention provides a method for selecting a policy and charging rule function entity in a non-roaming scenario, including: when the Diameter routing agent DRA receives the indication message of the IP connectivity session network IP-CAN session establishment, Transmitting the session establishment indication message to the PCRF according to the association relationship established and saved by the IP-CAN session allocation policy and the charging rule function PCRF entity; and corresponding policy and charging control performed by the PCRF for the IP-CAN session
  • the PCC policy forwards to the network element with the policy and charging enforcement function and the operator IP service interface AF corresponding to the IP-CAN session.
  • the DRA allocates a PCRF entity according to the packet data network identifier PDN ID carried by the indication message or according to the local configuration.
  • the method further includes the steps of:
  • the DRA After receiving the indication message, the DRA queries the locally saved association relationship. If the IP-CAN session does not exist in the association relationship, the IPF-associated PCRF address and IP-CAN session identifier IP- The CAN ID and the PDN ID binding are saved in the local association relationship; if the IP-CAN session exists in the association relationship, the saved address of the PCRF associated with the IP-CAN session is obtained; the DRA follows the IP- The address of the PCRF associated with the CAN session forwards the indication message;
  • the PCRF after receiving the indication message, the PCRF makes a PCC policy for the IP-CAN session, and the PCC policy is included in the response message and is forwarded by the DRA to the entity network element having the policy and charging execution function;
  • the AF sends the IP-CAN session service message to the PCRF through the DRA; the DRA queries the locally saved association relationship according to the address of the PCRF associated with the IP-CAN session. The message of the voice service is forwarded to the PCRF;
  • the PCRF After receiving the message of the session service, the PCRF sends a corresponding PCC policy for the session service, and forwards the response message including the PCC policy to the AF through the DRA.
  • the entity having the policy and charging execution function is a policy and charging execution function PCEF entity, or a gateway control function GWCF entity.
  • the indication message of the IP-CAN session establishment is sent by the PCEF entity or the GWCF entity, and after the DRA receives the different session establishment indication message related to the IP-CAN session, the method further includes the following steps:
  • the DRA forwards the indication message of the session establishment to the PCRF according to the address of the queried PCRF.
  • the PCRF After receiving the indication message of the session establishment, the PCRF sends a corresponding PCC policy for the session, and forwards the response message including the PCC policy through the DRA.
  • the information carried in the indication message further includes an IP-CAN ID, an identifier UE ID of the UE, and an IP address UE IP Address of the UE.
  • the association relationship between the DRA and the IP-CAN session further includes an address of the PCEF entity or The address of the GWCF entity, the address of the AF, the UE ID, the UE IP Address, and the address of the PCRF.
  • the PCEF entity resides in a packet data network gateway or resides in a trusted non-3GPP access gateway; the GWCF entity resides in the serving gateway.
  • the EPS of the 3GPP associates all PCEFs, GWCFs and AFs related to the IP-CAN session of the UE in the non-roaming scenario to the same PCRF through the DRA, thereby ensuring an IP-
  • the PCC policy for CAN sessions is determined by only one PCRF.
  • Figure 1 is a 3GPP EPS system architecture diagram
  • Figure 2 is a flow chart of Example 1 of the method of the present invention.
  • Figure 3 is a flow chart of a method 2 of the method of the present invention
  • 4 is a flow chart of a method example 3 of the present invention.
  • the present invention provides a method for selecting a policy and charging rule function entity in a non-roaming scenario, including the steps of:
  • the PCEF entity or the GWCF entity sends a request message to the DRA to inform the establishment of the session, to request the PCRF to issue a PCC policy related to the IP-CAN session through the DRA;
  • the PCEF entity or the GWCF entity includes any one or more of a P-GW, an S-GW, and a trusted non-3GPP access gateway.
  • the DRA queries the locally saved association table. If the IP-CAN session exists, the PCRF address associated with the IP-CAN session is used as the destination address; If the IP-CAN session does not exist, a PCRF is allocated for the IP-CAN session, the allocation result is saved in the local association table, and the IP-CAN session is bound to the address of the assigned PCRF; Receiving a message from the PCEF entity or GWCF entity to the PCRF;
  • the DRA allocates a PCRF according to the packet data network identifier PDN ID carried in the message or a local configuration situation (such as a local load balancing rule).
  • the PCRF after receiving the message from the PCEF entity or the GWCF entity, the PCRF makes a PCC policy for the IP-CAN session, and forwards the policy as a response to the corresponding P-GW or S-GW through the DRA;
  • the association relationship between the DRA and the IP-CAN session is an IP-CAN session identifier.
  • the exemplary 3GPP core network used in the exemplary embodiments is an EPC architecture.
  • Example 1 The exemplary 3GPP core network used in the exemplary embodiments is an EPC architecture.
  • This embodiment describes the process in which the interface protocol between the S-GW and the P-GW in the EPC is based on PMIP and the UE in the 3GPP coverage initiates an IP-CAN session.
  • the UE first initiates an IP-CAN session establishment request to the P-GW, the P-GW forwards the message to the PCRF through the DRA, and the DRA selects the PCRF, and after the IP-CAN session and the PCRF association relationship are locally saved, the S-GW and the AF pass respectively.
  • the DRA forwards the network control session setup message and the application/service message to the same PCRF.
  • the flowchart is shown in Figure 2. The steps are as follows:
  • the P-GW sends a message indicating that the IP-CAN session is established to the DRA, to notify the PCRF that the IP-CAN session is established, and the message includes the UE ID, the UE IP Address, the PDN ID, and the IP-CAN session ID information.
  • the P-GW selects the DRA based on the local configuration or PDN ID.
  • the DRA After receiving the foregoing indication message, the DRA according to the UE ID and UE IP included in the message
  • the Address, PDN ID, and IP-CAN session ID are used as query conditions for the IP-CAN session to query the PCRF information associated with the IP-CAN session. Since the request for session establishment is initiated for the first time, there is no PCRF information associated with the IP-CAN session on the DRA at this time, and the DRA selects a PCRF for the IP-CAN session according to the PDN ID or the local configuration, and saves the IP-CAN session and The association relationship of the PCRF; at the same time, forwarding the message from the P-GW to inform the establishment of the IP-CAN session to the PCRF;
  • the PCRF After receiving the message that informs the IP-CAN session establishment, the PCRF performs a corresponding PCC policy for the session, and returns a response message including the PCC policy to the DRA.
  • the DRA forwards the response message of the received PCRF to the P-GW.
  • the S-GW sends a message that the gateway control session is established to the DRA, to notify the PCRF that the gateway control session is established, and the message includes the UE ID and the PDN ID information.
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE ID and the PDN ID information in the message as the query condition of the IP-CAN session. Due to The DRA has previously stored the association relationship between the IP-CAN session and the PCRF, and the DRA forwards the gateway control session establishment message from the S-GW by using the queried PCRF address as the destination address;
  • the PCRF After receiving the gateway control session establishment message, the PCRF performs a corresponding PCC policy for the session, and returns a response message containing the PCC policy to the DRA.
  • the DRA receives the response message from the PCRF, and forwards the response message to the S-GW.
  • the AF sends an application/service message of the IP-CAN session to the DRA, to send an application/service to the PCRF, where the message carries the UE IP Address and the PDN ID;
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE IP Address and the PDN ID in the message as the query condition of the IP-CAN session. Since the relationship between the IP-CAN session and the PCRF has been saved in the DRA, the DRA forwards the application/service message from the AF by using the queried PCRF address as the destination address;
  • the PCRF After receiving the application/service message, the PCRF performs a corresponding PCC policy for the PCF, and returns a response message containing the PCC policy to the DRA.
  • the DRA forwards the response message of the received PCRF to the AF.
  • the association relationship between the DRA and the IP-CAN session is an IP-CAN session identifier.
  • This embodiment describes that a mobile IP protocol (MIP, Mobile Internet Protocol) is used between a trusted non-3GPP access gateway and a P-GW, and a MIP tunnel is established, which is initiated by a UE that is within the coverage of a trusted non-3GPP access network.
  • MIP Mobile Internet Protocol
  • the process of an IP-CAN session The UE first initiates a session IP-CAN setup request, and the P-GW forwards the message to the PCRF through the DRA. After receiving the P-GW message, the DRA selects the PCRF, and locally stores the association relationship between the IP-CAN session and the PCRF, and then trusts.
  • the non-3GPP access gateway and the AF respectively forward the network control session establishment message and the application/service message to the same PCRF through the DRA, and the flowchart thereof is shown in FIG. 3, and the steps are described as follows:
  • the P-GW sends a message indicating that the IP-CAN session is established to the DRA, to notify the PCRF of the IP-CAN session establishment, where the message includes the UE ID, the UE IP Addreess, and the PDN ID information.
  • the DRA queries the PCRF information associated with the IP-CAN session according to the UE ID, the UE IP Addreess, and the PDN ID information in the message as the query condition of the IP-CAN session. Since it is the first request for session establishment, there is no PCRF information associated with the IP-CAN session on the DRA at this time.
  • the DRA selects a PCRF for the IP-CAN session according to the PDN ID or local configuration, and saves the IP-CAN. The association between the session and the PCRF, and simultaneously forwarding the message from the P-GW to inform the IP-CAN session establishment to the PCRF;
  • the PCRF After receiving the message that informs the IP-CAN session establishment, the PCRF performs a corresponding PCC policy for the session, and returns a response message containing the PCC policy to the DRA.
  • the DRA forwards the response message of the received PCRF to the P-GW.
  • the trusted non-3GPP access gateway sends a message to the DRA to establish a session control session, to notify the PCRF that the gateway controls the session establishment, and the message includes the UE ID and the PDN ID information.
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE ID and the PDN ID information in the message as the query condition of the IP-CAN session. Since the DRA has previously stored the association relationship between the IP-CAN session and the PCRF, the DRA forwards the queried PCRF address as the destination address to the gateway control session establishment message from the trusted non-3GPP access gateway;
  • the PCRF After receiving the gateway control session establishment message, the PCRF performs a corresponding PCC policy for the gateway, and returns a response message to the DRA.
  • the DRA forwards the response message of the received PCRF to the trusted non-3GPP access gateway.
  • the AF sends the IP-CAN session application/service message to the DRA to deliver the application/service to the PCRF, where the message carries the UE. IP Address and PDN ID information;
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE IP Address and PDN ID information in the message as the query condition of the IP-CAN session. Since the relationship between the IP-CAN session and the PCRF has been saved in the DRA, the DRA forwards the application/service message from the AF by using the queried PCRF address as the destination address;
  • the PCRF After receiving the application/service message, the PCRF sends a corresponding PCC policy for it, and returns a response message containing the PCC policy to the DRA.
  • the DRA forwards the response message of the received PCRF to the AF.
  • the relationship between the DRA and the IP-CAN session is IP-CAN session identifier IP-CAN ID, P-GW Address/S-GW Address/AF Address, UE ID, UE IP Address, PDN ID, and PCRF Address. .
  • This embodiment describes a process in which a UE in an untrusted non-3GPP coverage initiates an IP-CAN session.
  • the UE first initiates a session IP-CAN setup request, and the P-GW forwards the message to the PCRF through the DRA.
  • the DRA selects the PCRF, and locally saves the IP-CAN session and the PCRF association relationship, and then the AF passes.
  • the DRA forwards the IP-CAN session application/service message to the same PCRF.
  • the flowchart is shown in Figure 4. The steps are as follows:
  • the P-GW sends a message indicating that the IP-CAN session is established to the DRA, to notify the PCRF that the IP-CAN session is established, and the message includes the UE ID, the UE IP Addreess, and the PDN ID information.
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE ID, UE IP Addreess, and PDN ID information in the message as the query condition of the IP-CAN session. Since it is the first request for session establishment, there is no PCRF information associated with the IP-CAN session on the DRA at this time.
  • the DRA selects a PCRF for the IP-CAN session according to the PDN ID or local configuration, and saves the IP-CAN. The association between the session and the PCRF; meanwhile, forwarding, to the PCRF, a message of the P-GW notifying the establishment of the IP-CAN session;
  • the PCRF After receiving the message indicating the establishment of the IP-CAN session, the PCRF performs a corresponding PCC policy for the session, and returns a response message to the DRA.
  • the DRA forwards the response message of the received PCRF to the P-GW.
  • the AF sends the IP-CAN session application/service message to the DRA to deliver the application/service to the PCRF, where the message carries the UE IP Address and the PDN ID information;
  • the DRA After receiving the message, the DRA queries the PCRF information associated with the IP-CAN session according to the UE IP Address and the PDN ID information in the message as the query condition of the IP-CAN session. Since the relationship between the IP-CAN session and the PCRF has been saved in the DRA, the DRA forwards the application/service message from the AF by using the queried PCRF address as the destination address;
  • the PCRF After receiving the application/service message, the PCRF makes a corresponding PCC policy for it, and DRA returns a response message;
  • the DRA forwards the response message of the received PCRF to the AF.
  • the association relationship between the DRA and the IP-CAN session is an IP-CAN session identifier IP-CAN ID, a P-GW Address/AF Address, a UE ID, a UE IP Address, a PDN ID, and a PCRF Address.
  • the method of the present invention can ensure that the 3GPP EPS associates all PCEFs, GWCFs, and AFs related to the IP-CAN session of the UE in the non-roaming scenario to the same one through the DRA.
  • the PCC policy to ensure an IP-CAN session is determined by only one PCRF.
  • the invention can associate all PCEFs, GWCFs and AFs related to the IP-CAN session of the UE in the non-roaming scenario to the same PCRF, thereby facilitating the development of the 3GPP network.

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Description

非漫游场景下策略和计费规则功能实体的选择方法
技术领域
本发明涉及第三代伙伴计划 （ 3GPP , 3rd Generation Partnership Project ) 演进的分组核心（EPC, Evolved Packet Core ) 网架构中的策略和计费规则功 能实体的选择方法。 背景技术
3GPP演进的分组系统（ EPS, Evolved Packet System )由演进的通用陆地 无线接入网（ E-UTRAN , Evolved Universal Terrestrial Radio Access Network )、 移动管理单元（ MME, Mobility Management Entity )、服务网关（ S-GW, Serving Gateway ) 、 分组数据网络网关 ( P-GW, Packet Data Network Gateway ) 、 归 属用户服务器（HSS, Home Subscriber Server ) 、 3GPP认证授权计费服务器 ( AAA, Authentication Authorization Accounting ) , 策略和计费规则功能 ( PCRF , Policy and Charging Rules Function ) 实体以及其它支撑节点组成。 其中， MME负责移动性管理、非接入层信令的处理以及用户的移动管理上下 文的管理等控制面相关工作； S-GW是与 E-UTRAN相连的接入网关设备，在 E-UTRAN和 P-GW之间转发数据，并且负责对寻呼等待数据进行緩存。 P-GW 则是 3GPP EPS与分组数据网络（ PDN, Packet Data Network ) 的边界网关， 负责 PDN的接入， 并在 EPS与 PDN间转发数据等。 PCRF是策略和计费规 则功能实体，它通过 Rx接口与运营商 IP业务接口（ AF , Application Function ) 交互，获取业务信息；并通过 S7/S7a/S7c与网络中的网关设备（ S-GW、 P-GW ) 相连， 负责发起 IP承载的建立， 保证业务数据的服务质量（QoS, Quality of Service ) , 并进行计费控制。
EPS的系统架构图如图 1所示。 EPS支持与非 3GPP网络的互通， 通过
S2a/S2b/ S2c接口实现。 P-GW作为 3GPP与非 3GPP网络间的锚点。 其中非 3GPP系统被分为可信任非 3GPP IP接入和不可信任非 3GPP IP接入。可信任 非 3GPP IP接入可直接通过 S2a与 P-GW接口； 不可信任非 3GPP IP接入需 经过演进的分组数据网关（ ePDG, Evolved Packet Data Gateway )与 P-GW相 连， ePDG与 P-GW间的接口为 S2b。
在传统的 3GPP网络中，策略和计费执行功能（ PCEF, Policy and Charging Enforcement Function )仅存在于 P-GW中， PCRF只要与 P-GW接口即可完成 所有功能的控制， PCRF与 P-GW间通过 S7接口交换信息， 可参见图 1。
但是， 当 3GPP网络提供了与非 3GPP的互通功能后， P-GW与 S-GW之 间的接口基于分组移动互联网协议（ PMIP, Packet Mobile Internet Protocol ) 时， PCEF功能中的策略执行功能部分也存在于 S-GW中，称为网关控制功能 ( GWCF, Gateway Control Function ),比如承载的绑定功能等； S-GW与 PCRF 之间通过 S7c接口 （见图 1 )交换信息。 当可信任非 3GPP接入系统通过 S2a 与 3GPP系统间互通接入时， 可信任非 3GPP接入网关中也会驻留 GWCF, 如图 1中所示。
EPS的一个公共陆地移动网 （PLMN, Public Land Mobile Network ) 中存 在多个 PCRF节点，并且所有的 PCRF节点属于一个或多个 Diameter ( PCRF ) 域， 一个 Diameter ( PCRF )域中的所有 PCRF都是平等的。 一个 UE到 PDN 的连接称为一个 IP连通性会话网络（ IP-CAN , IP Connectivity Access Network ) 会话。为了确保一个 IP-CAN会话的策略和计费控制（ PCC, Policy and Charging Control )只由一个 PCRF决定， EPS在每个 Diameter ( PCRF )域中引入了一 个逻辑功能实体， 即 Diameter路由代理（DRA, Diameter Routing Agent ) 网 元。 当 UE发起一个 IP-CAN会话建立时， 由 DRA为这个 IP-CAN会话选择 一个 PCRF。
当一个 UE处于非漫游场景， 且 3GPP核心网釆用的是 EPC架构时， 通 常会有三种情况： 其一是 UE处于 3GPP覆盖范围内； 其二是 UE处可信的非 3GPP覆盖范围内； 其三是 UE处非可信的非 3GPP覆盖范围内。
而现有的 EPS并未针对处于非漫游场景 UE的上述三种情况为 DRA选择 PCRF做出任何具体的规划。 况且， 由于策略执行功能部分存在于 S-GW及 P-GW等多个网元中 （GWCF、 PCEF ) , 当 S-GW及 P-GW都向 DRA提出 PCRF选择要求时， 会造成一个 IP-CAN会话通过 DRA选择的 PCRF出现不 一致的情况。 因此， 现有技术亟待解决： 在 UE处于非漫游场景下， 如何通 过 DRA将与 UE的一个 IP-CAN会话相关的所有 PCEF、 GWCF和 AF都关联 到同一个 PCRF上。
发明内容
本发明所要解决的技术问题是提供一种非漫游场景下策略和计费规则功 能实体的选择方法， 能使得 DRA将处于非漫游场景下 UE的 IP-CAN会话相 关的所有的 PCEF、 GWCF和 AF都关联到同一个 PCRF上。
为了解决上述技术问题， 本发明提供了一种非漫游场景下策略和计费规 则功能实体的选择方法， 包括： Diameter路由代理 DRA接收到 IP连通性会 话网络 IP-CAN会话建立的指示消息时，根据为 IP-CAN会话分配策略和计费 规则功能 PCRF实体所建立并保存的关联关系， 向 PCRF转发会话建立的指 示消息； 以及将 PCRF为 IP-CAN会话做出的相应的策略和计费控制 PCC策 略， 向 IP-CAN会话对应的具有策略和计费执行功能的网元和运营商 IP业务 接口 AF转发。
进一步地， DRA根据指示消息携带的分组数据网标识 PDN ID或根据本 地配置情况分配 PCRF实体。
进一步地， 所述方法进一步包括步骤：
( a ) 当用户设备 UE发起一个 IP-CAN会话建立请求时， 该具有策略和 计费执行功能的网元向 DRA发送该指示消息；
( b ) DRA收到该指示消息后， 查询本地保存的关联关系， 若该关联关 系不存在该 IP-CAN会话，则将为 IP-CAN会话分配的 PCRF的地址、 IP-CAN 会话标识 IP-CAN ID以及 PDN ID绑定保存在本地的该关联关系中； 若该关 联关系存在该 IP-CAN会话， 则获取保存的与该 IP-CAN会话关联的该 PCRF 的地址； DRA按照与该 IP-CAN会话关联的该 PCRF的地址转发该指示消息；
( c ) PCRF收到该指示消息后， 为该 IP-CAN会话做出 PCC策略， 且将 该 PCC策略包含在响应消息中通过 DRA转发给具有策略和计费执行功能的 实体网元；
( d ) AF通过 DRA向 PCRF下发该 IP-CAN会话业务的消息； DRA查询 本地保存的该关联关系， 按照与该 IP-CAN会话关联的 PCRF的地址将该会 话业务的消息转发给 PCRF;
( e ) PCRF收到该会话业务的消息后， 为该会话业务做出相应的 PCC策 略， 并将包含 PCC策略的响应消息通过 DRA转发给 AF。
进一步地，具有策略和计费执行功能的实体为策略和计费执行功能 PCEF 实体， 或为网关控制功能 GWCF实体。
进一步地， 该 IP-CAN会话建立的指示消息由 PCEF实体或 GWCF实体 发出，在此后 DRA又接收到与该 IP-CAN会话相关的不同的会话建立指示消 息时， 所述方法还包括步骤：
DRA按查询到的 PCRF的地址向 PCRF转发该会话建立的指示消息； PCRF收到该会话建立的指示消息后， 为该会话做出相应的 PCC策略， 并将包含 PCC策略的响应消息通过 DRA转发给发送不同的会话建立指示消 息的实体。
进一步地，该指示消息中携带的信息还包括 IP-CAN ID、UE的标识 UE ID 以及 UE的 IP地址 UE IP Address; DRA保存的与该 IP-CAN会话的关联关系 还包括 PCEF实体的地址或 GWCF实体的地址、 AF的地址、 UE ID、 UE IP Address以及 PCRF的地址。
进一步地， PCEF 实体驻留在分组数据网络网关中或驻留在可信任非 3GPP接入网关中； GWCF实体驻留在服务网关中。
釆用本发明的方法，能够保证 3GPP的 EPS通过 DRA将处于非漫游场景 下的 UE的与 IP-CAN会话相关的所有的 PCEF、 GWCF和 AF都关联到同一 个 PCRF上， 从而确保一个 IP-CAN会话的 PCC策略只由一个 PCRF决定。 附图概述
图 1是 3GPP 的 EPS系统架构图；
图 2是本发明的方法实例 1的流程图；
图 3是本发明的方法实例 2的流程图； 图 4是本发明的方法实例 3的流程图。
本发明的较佳实施方式
本发明提供了一种非漫游场景下策略和计费规则功能实体的选择方法， 包括步骤：
( a ) 当 UE发起一个 IP-CAN会话建立时， PCEF实体或 GWCF实体向 DRA发送告知该会话建立的请求消息， 以通过 DRA向 PCRF请求下发与该 IP-CAN会话相关的 PCC策略；
这里， PCEF实体或 GWCF实体包括 P-GW、 S-GW以及可信任非 3GPP 接入网关中的任意一种或多种。
( b ) DRA收到来自 PCEF实体或 GWCF实体的请求消息后， 查询本地 保存的关联关系表，如果存在该 IP-CAN会话， 就将与该 IP-CAN会话关联的 PCRF地址作为目的地址； 如果不存在该 IP-CAN会话， 就为该 IP-CAN会话 分配一个 PCRF, 将分配结果保存在本地的关联关系表中， 且将该 IP-CAN会 话与分配的 PCRF的地址绑定； 同时， 将收到的来自 PCEF实体或 GWCF实 体消息转发给该 PCRF;
这里， DRA根据消息中携带的分组数据网络标识 PDN ID或本地配置情 况（譬如本地负荷均衡规则 )分配 PCRF。
( c ) PCRF收到来自 PCEF实体或 GWCF实体的消息后， 为 IP-CAN会 话做出 PCC策略， 且将该策略作为响应通过 DRA转发给对应的 P-GW或 S-GW;
( d )当 AF需要向 PCRF下发 IP-CAN会话业务消息时， 先向 DRA发送 消息； DRA查询本地保存的 IP-CAN会话关联的 PCRF地址信息， 将该消息 转发到给该 PCRF; DRA将收到的 PCRF的响应消息转发给对应的 AF。
其中， DRA保存的与该 IP-CAN会话的关联关系为 IP-CAN会话标识
Address, UE的标识 UE ID、 UE 的 IP地址 UE IP Address, PDN ID以及 PCRF 的地址 PCRF Address。 以下将结合实施例和附图对本发明上述技术方案进行详细地阐述。 其中 例举的实施例中 3GPP核心网釆用的均为 EPC架构。 实施例 1
本实施例描述的是在 EPC中 S-GW与 P-GW之间的接口协议基于 PMIP、 处于 3GPP覆盖范围内的 UE发起 IP-CAN会话的过程。 UE首先向 P-GW发 起 IP-CAN会话建立请求， P-GW通过 DRA转发消息给 PCRF, DRA选择 PCRF,并在本地保存该 IP-CAN会话和 PCRF关联关系后， S-GW和 AF分别 通过 DRA将网络控制会话建立消息和应用 /业务消息转发到相同的 PCRF,其 流程图如图 2所示， 各步骤描述如下：
202: P-GW向 DRA发送指示 IP-CAN会话建立的消息， 以告知 PCRF 该 IP-CAN会话建立，消息中包括 UE ID、 UE IP Address、 PDN ID以及 IP-CAN 会话 ID信息；
在此 , P-GW根据本地配置或 PDN ID来选择 DRA。
204: DRA 收到上述指示消息后， 根据消息中带有的 UE ID、 UE IP
Address、 PDN ID以及 IP-CAN会话 ID作为 IP-CAN会话的查询条件， 查询 与该 IP-CAN会话关联的 PCRF信息。 由于是初次提出会话建立的请求， 故 此时在 DRA上还没有该 IP-CAN会话关联的 PCRF信息 , DRA根据 PDN ID 或本地配置为 IP-CAN会话选择一个 PCRF, 并保存该 IP-CAN会话与 PCRF 的关联关系； 同时， 向 PCRF转发来自 P-GW的告知 IP-CAN会话建立的消 息；
206: PCRF收到告知 IP-CAN会话建立的消息后， 为该会话做出相应的 PCC策略， 并将包含该 PCC策略的响应消息向 DRA返回；
208: DRA将收到的 PCRF的响应消息转发给 P-GW;
210: S-GW向 DRA发送网关控制会话建立的消息， 以告知 PCRF该网 关控制会话建立， 消息中包括 UE ID及 PDN ID信息；
212: DRA收到该消息后， 根据消息中带有的 UE ID及 PDN ID信息作 为 IP-CAN会话的查询条件， 查询与该 IP-CAN会话关联的 PCRF信息。 由于 在此前 DRA已经保存了该 IP-CAN会话和 PCRF的关联关系 , DRA将查询到 的 PCRF地址作为目的地址转发来自 S-GW的网关控制会话建立消息；
214: PCRF收到网关控制会话建立消息后， 为该会话做出相应的 PCC策 略， 并将含有该 PCC策略的响应消息向 DRA返回；
216: DRA收到来自 PCRF的响应消息， 将该响应消息转发给 S-GW;
218: AF向 DRA发送该 IP-CAN会话的应用 /业务的消息， 以向 PCRF下 发应用 /业务， 消息中携带 UE IP Address及 PDN ID；
220： DRA收到该消息后， 根据消息中带有的 UE IP Address及 PDN ID 作为 IP-CAN会话的查询条件， 查询与该 IP-CAN会话关联的 PCRF信息。 由 于 DRA中已经保存了该 IP-CAN会话和 PCRF的关联关系， DRA将查询到的 PCRF地址作为目的地址转发来自 AF的应用 /业务的消息；
222: PCRF收到该应用 /业务的消息后， 为其做出相应的 PCC策略， 并 将含有该 PCC策略的响应消息向 DRA返回；
224： DRA将收到的 PCRF的响应消息转发给 AF。
其中， DRA保存的与该 IP-CAN会话的关联关系为 IP-CAN会话标识
IP-CAN ID、 P-GW Address/S-GW Address/AF Address, UE ID、 UE IP Address, PDN ID以及 PCRF Address。 实施例 2
本实施例描述的是在可信任非 3GPP接入网关和 P-GW之间使用移动 IP 协议（ MIP, Mobile Internet Protocol )并建立 MIP隧道， 处于可信任非 3GPP 接入网覆盖范围内的 UE发起 IP-CAN会话的过程。 UE首先发起会话 IP-CAN 建立请求 , P-GW通过 DRA转发消息给 PCRF , DRA收到 P-GW的消息后选 择 PCRF, 并在本地保存该 IP-CAN会话与 PCRF的关联关系， 之后可信任非 3GPP接入网关和 AF分别通过 DRA将网络控制会话建立消息和应用 /业务消 息转发到相同的 PCRF, 其流程图如图 3所示， 各步骤描述如下：
302: P-GW向 DRA发送指示 IP-CAN会话建立的消息， 以告知 PCRF 该 IP-CAN会话建立， 消息中包括 UE ID、 UE IP Addreess以及 PDN ID信息； 304: DRA收到该消息后， 根据消息中带有的 UE ID、 UE IP Addreess及 PDN ID信息作为 IP-CAN会话的查询条件， 查询与该 IP-CAN会话关联的 PCRF信息。 由于是初次提出会话建立的请求， 故此时在 DRA上还没有与该 IP-CAN会话关联的 PCRF的信息， DRA根据 PDN ID或本地配置为 IP-CAN 会话选择一个 PCRF, 并保存该 IP-CAN会话与该 PCRF的关联关系， 同时， 向 PCRF转发来自 P-GW的告知 IP-CAN会话建立的消息；
306: PCRF收到告知 IP-CAN会话建立的消息后， 为该会话做出相应的 PCC策略， 并将含有该 PCC策略的响应消息向 DRA返回；
308: DRA将收到的 PCRF的响应消息转发给 P-GW;
310: 可信任非 3GPP接入网关向 DRA发送网关控制会话建立的消息， 以告知 PCRF该网关控制会话建立 , 消息中包括 UE ID及 PDN ID信息；
312: DRA收到该消息后， 根据消息中带有的 UE ID及 PDN ID信息作 为 IP-CAN会话的查询条件， 查询与该 IP-CAN会话关联的 PCRF信息。 由于 在此前 DRA已经保存了该 IP-CAN会话和 PCRF的关联关系， DRA将查询到 的 PCRF地址作为目的地址转发来自可信任非 3GPP接入网关的网关控制会 话建立消息；
314: PCRF收到该网关控制会话建立消息后，为其做出相应的 PCC策略， 并向 DRA返回响应消息；
316: DRA将收到的 PCRF的响应消息转发给可信任非 3GPP接入网关； 318: AF向 DRA发送该 IP-CAN会话应用 /业务消息， 以向 PCRF下发应 用 /业务， 消息中携带 UE IP Address及 PDN ID信息；
320： DRA收到该消息后， 根据消息中带有的 UE IP Address及 PDN ID 信息作为 IP-CAN会话的查询条件，查询与该 IP-CAN会话关联的 PCRF信息。 由于 DRA中已经保存了该 IP-CAN会话和 PCRF的关联关系， DRA将查询到 的 PCRF地址作为目的地址转发来自 AF的应用 /业务的消息；
322: PCRF收到该应用 /业务的消息后， 为其做出相应的 PCC策略， 并 将含有该 PCC策略的响应消息向 DRA返回；
324： DRA将收到的 PCRF的响应消息转发给 AF。 其中， DRA保存的与该 IP-CAN会话的关联关系为 IP-CAN会话标识 IP-CAN ID、 P-GW Address/S-GW Address/AF Address, UE ID、 UE IP Address, PDN ID以及 PCRF Address。
实施例 3
本实施例描述的是处于非可信任非 3GPP覆盖范围内的 UE发起 IP-CAN 会话的过程。 UE首先发起会话 IP-CAN建立请求， P-GW通过 DRA转发消 息给 PCRF, DRA收到 P-GW发送的消息后选择 PCRF, 并在本地保存该 IP-CAN会话和 PCRF关联关系， 之后 AF通过 DRA将该 IP-CAN会话应用 / 业务消息转发到相同的 PCRF, 其流程图如图 4所示， 各步骤描述如下：
402: P-GW向 DRA发送指示 IP-CAN会话建立的消息， 以告知 PCRF 该 IP-CAN会话建立， 消息中包括 UE ID、 UE IP Addreess及 PDN ID信息；
404: DRA收到该消息后， 根据消息中带有的 UE ID、 UE IP Addreess及 PDN ID信息作为 IP-CAN会话的查询条件， 查询与该 IP-CAN会话关联的 PCRF信息。 由于是初次提出会话建立的请求， 故此时在 DRA上还没有与该 IP-CAN会话关联的 PCRF的信息， DRA根据 PDN ID或本地配置为 IP-CAN 会话选择一个 PCRF, 并保存该 IP-CAN会话与该 PCRF的关联关系； 同时， 向 PCRF转发 P-GW的告知 IP-CAN会话建立的消息；
406: PCRF收到告知 IP-CAN会话建立的消息后， 为该会话做出相应的 PCC策略， 并向 DRA返回响应消息；
408: DRA将收到的 PCRF的响应消息转发给 P-GW;
410: AF向 DRA发送该 IP-CAN会话应用 /业务消息， 以向 PCRF下发应 用 /业务， 消息中携带 UE IP Address及 PDN ID信息；
412: DRA收到该消息后， 根据消息中带有的 UE IP Address及 PDN ID 信息作为 IP-CAN会话的查询条件，查询与该 IP-CAN会话关联的 PCRF信息。 由于 DRA中已经保存了该 IP-CAN会话和 PCRF的关联关系， DRA将查询到 的 PCRF地址作为目的地址转发来自 AF的应用 /业务消息；
414: PCRF收到该应用 /业务消息后， 为其做出相应的 PCC策略， 并向 DRA返回响应消息；
416: DRA将收到的 PCRF的响应消息转发给 AF。
其中， DRA保存的与该 IP-CAN会话的关联关系为 IP-CAN会话标识 IP-CAN ID、 P-GW Address/AF Address, UE ID、 UE IP Address, PDN ID以 及 PCRF Address。
通过以上三个实施例可以看出， 本发明的方法能够保证 3GPP的 EPS通 过 DRA将任何处于非漫游场景下的 UE 的与 IP-CAN会话相关的所有的 PCEF、 GWCF和 AF都关联到同一个 PCRF上， 从而确保一个 IP-CAN会话 的 PCC策略只由一个 PCRF决定。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性
本发明能够将处于非漫游场景下 UE的 IP-CAN会话相关的所有的 PCEF、 GWCF和 AF都关联到同一个 PCRF上， 从而有利于 3GPP网络的发展。

Claims

权 利 要 求 书
1、 一种非漫游场景下策略和计费规则功能实体的选择方法， 包括： Diameter路由代理 DRA接收到 IP连通性会话网络 IP-CAN会话建立的指示 消息时， 根据为所述 IP-CAN会话分配策略和计费规则功能 PCRF实体所建 立并保存的关联关系， 向所述 PCRF转发所述会话建立的指示消息； 以及将 所述 IP-CAN会话对应的具有策略和计费执行功能的网元和运营商 IP业务接 口 AF转发。
2、 按照权利要求 1所述的方法， 其特征在于， 所述 DRA根据所述指示 消息携带的分组数据网标识 PDN ID或根据本地配置情况分配所述 PCRF实 体。
3、 按照权利要求 2所述的方法，其特征在于，所述方法进一步包括步骤：
( a ) 当用户设备 UE发起一个 IP-CAN会话建立请求时， 所述具有策略 和计费执行功能的网元向所述 DRA发送所述指示消息；
( b )所述 DRA收到所述指示消息后， 查询本地保存的关联关系， 若所 述关联关系不存在所述 IP-CAN会话， 则将为所述 IP-CAN会话分配的所述 PCRF的地址、 所述 IP-CAN会话标识 IP-CAN ID以及所述 PDN ID绑定保存 在本地的所述关联关系中； 若所述关联关系存在所述 IP-CAN会话， 则获取 IP-CAN会话关联的所述 PCRF的地址转发所述指示消息；
( c )所述 PCRF收到所述指示消息后，为所述 IP-CAN会话做出所述 PCC 策略， 且将所述 PCC策略包含在响应消息中通过所述 DRA转发给所述具有 策略和计费执行功能的实体网元；
消息； 所述 DRA查询本地保存的所述关联关系， 按照与所述 IP-CAN会话关 联的所述 PCRF的地址将所述会话业务的消息转发给所述 PCRF;
( e )所述 PCRF收到所述会话业务的消息后， 为所述会话业务做出相应 的 PCC策略， 并将包含所述 PCC策略的响应消息通过所述 DRA转发给所述 AF。
4、 按照权利要求 1至 3任一项所述的方法，其特征在于， 所述具有策略 和计费执行功能的实体为策略和计费执行功能 PCEF 实体， 或为网关控制功 能 GWCF实体。
5、 按照权利要求 4所述的方法， 其特征在于， 所述 IP-CAN会话建立的 指示消息由所述 PCEF实体或所述 GWCF实体发出， 在此后所述 DRA又接 收到与所述 IP-CAN会话相关的不同的会话建立指示消息时， 所述方法还包 括步骤：
所述 DRA按查询到的所述 PCRF的地址向所述 PCRF转发所述会话建立 的指示消息；
所述 PCRF 收到所述会话建立的指示消息后， 为所述会话做出相应的 PCC策略， 并将包含所述 PCC策略的响应消息通过所述 DRA转发给发送所 述不同的会话建立指示消息的实体。
6、 按照权利要求 1至 3任一项所述的方法，其特征在于， 所述指示消息 中携带的信息还包括所述 IP-CAN ID、所述 UE的标识 UE ID以及所述 UE的 IP地址 UE IP Address; 所述 DRA保存的与所述 IP-CAN会话的关联关系还 包括所述 PCEF实体的地址或所述 GWCF实体的地址、 所述 AF的地址、 所 述 UE ID、 所述 UE IP Address以及所述 PCRF的地址。
7、 按照权利要求 1至 3任一项所述的方法， 其特征在于， 所述 PCEF 实体驻留在分组数据网络网关中或驻留在可信任非 3GPP接入网关中； 所述 GWCF实体驻留在服务网关中。
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