WO2011134327A1 - Procédé et système permettant de déterminer une fonction de règles de politique et de facturation - Google Patents

Procédé et système permettant de déterminer une fonction de règles de politique et de facturation Download PDF

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Publication number
WO2011134327A1
WO2011134327A1 PCT/CN2011/072032 CN2011072032W WO2011134327A1 WO 2011134327 A1 WO2011134327 A1 WO 2011134327A1 CN 2011072032 W CN2011072032 W CN 2011072032W WO 2011134327 A1 WO2011134327 A1 WO 2011134327A1
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WIPO (PCT)
Prior art keywords
dra
address translation
pcrf
information
translation information
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PCT/CN2011/072032
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English (en)
Chinese (zh)
Inventor
蒋陶
周星月
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中兴通讯股份有限公司
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Publication of WO2011134327A1 publication Critical patent/WO2011134327A1/fr

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Classifications

    • 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
    • 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
    • H04L41/04—Network management architectures or arrangements
    • H04L41/046—Network management architectures or arrangements comprising network management agents or mobile agents therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/66—Policy and charging system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24—Accounting or billing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses

Definitions

  • the present invention relates to policy and charging control formulation techniques, and more particularly to a method and system for determining policy and charging rules functions. Background technique
  • Figure 1 is a network structure diagram of an existing EPC network
  • Figure 2 is a system architecture diagram of an existing EPC network.
  • 3GPP 3rd Generation Partnership Project
  • 3rd Generation Partnership Project evolves a grouping.
  • the system (EPS, Evolved Packet System) consists of an evolved universal mobile communication system (E-UTRAN, Evolved Universal Terrestrial Radio Access Network), a mobility management unit (MME, Mobility Management Entity), and a monthly service gateway (S -GW, Serving Gateway), Packet Data Network Gateway (PDN GW, Packet Data Network Gateway, also known as P-GW), Home Subscriber Server (HSS), Policy and Charging Rules (PCRF, Policy and Charging Rules Function ) The entity and other supporting nodes.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • MME Mobility Management Entity
  • S -GW Serving Gateway
  • PDN GW Packet Data Network Gateway
  • HSS Home Subscriber Server
  • PCRF Policy and Charging Rules Function
  • the E-UTRAN is connected to the MME through the S1-MME, and the MME is connected to the HSS through the S6a interface;
  • the S-GW is an access gateway device connected to the E-UTRAN, and forwards data between the E-UTRAN and the P-GW, and responsible for buffering the paging waiting data.
  • the S-GW is connected to the EUTRAN through the SI-U interface, connected to the MME through the S11 interface, connected to the PCRF through the Gxc interface, and connected to the P-GW through the S5 interface.
  • the P-GW is the EPS.
  • the border gateway of the packet data network (PDN) is responsible for accessing the PDN and forwarding data between the EPS and the PDN.
  • the P-GW is connected to the PCRF through the Gx interface, and is connected to the IP service provided by the operator through the SGi.
  • the PCRF is connected to the operator's Internet Protocol (IP) service network interface through the Rx interface to obtain service information, and is set up through the Gx/Gxa/Gxb/Gxc interface and the gateway in the 3GPP network. It is connected and is responsible for initiating the establishment of IP bearers, guaranteeing the quality of service (QoS) of service data, and performing charging control.
  • IP Internet Protocol
  • FIG. 3 is a schematic diagram of the system architecture of the PCC in the existing EPC network.
  • the Policy and charging enforcement function (PCEF) resides in the P-GW of the EPS system, between the PCRF and the PCEF. Exchange information through the Gx interface.
  • the S-GW also has a policy control function, called Bearer Binding and Event Reporting Function (BBERF, BBERF and PCRF). Information is exchanged between the Gxc interfaces.
  • the service function (AF, Application Function) for the UE is sent to the PCRF through the Rx interface to send service information for formulating a Policy and Charging Control (PCC) or QoS policy.
  • PCC Policy and Charging Control
  • the EPS can provide billing system charging information for the billing system, including offline billing and online billing.
  • billing system charging information for online charging, when the UE accesses through 3GPP, the P-GW interacts with the online charging system (OCS) to perform credit control.
  • OCS online charging system
  • the P-GW generates the charging information and sends it to the charging system, which includes the charging identifier, which is called the Access-Network-Charging-Identifier, and can also be called the bearer layer charging identifier.
  • the application server can also provide the accounting information of the application layer to the charging system, and the charging information is also identified by the charging identifier, which is called an application function charging identifier (AF-Charging-Identifier).
  • the charging identifier is generated by the AF and sent to the relevant application server.
  • FIG 4 is a schematic diagram of the structure of a PCC system in the current scenario of deploying a DRA.
  • DRA Diameter Protocol Routing Agent
  • the Diameter protocol is certified and authorized by the IETF.
  • the Billing Working Group (AAA Working Group) serves as the next generation AAA protocol standard.
  • Diameter is the diameter, which means that the Diameter protocol is an upgraded version of the Remote Authentication Dial In User Service (RADIUS) protocol.
  • RADIUS Remote Authentication Dial In User Service
  • FIG. 5 is a schematic diagram of the workflow of the existing DRA as a Diameter proxy
  • FIG. 6 is a schematic diagram of the workflow of the existing DRA as a Diameter redirection function.
  • the proxy Diameter message refers to: when the DRA receives the Diameter message from the Gx interface or the Rx interface, selects a target PCRF for the Diameter message, and forwards the received Diameter message to the selected target PCRF. At the same time, the PCRF sends the Diameter message to the DRA first, and the DRA forwards the received Diameter message to the corresponding PCEF/BBERF for processing.
  • the so-called Diameter redirection message refers to that after receiving the Diameter signaling message from the Gx interface or the Rx interface, the DRA selects a target PCRF for the Diameter signaling message; after selecting, the address information of the target PCRF is passed.
  • the Diameter redirect message is sent to the corresponding PCEF/BBERF or AF.
  • the PCEF/BBERF or AF sends Diameter signaling to the corresponding PCRF according to the address information of the PCRF to establish a Diameter session.
  • FIG. 7 A schematic diagram of a network structure for deploying an IP address translation device in an EPC network, as shown in FIG. 7, due to the existence of an IP address translation device (the CGN in FIG. 7 is an abbreviation of a bearer-level network address translation device, which is an IP address). Translation device), so that the same PDN connection carries the IP address and port number used inside the EPC, which is different from the IP address and port number used in the external packet network.
  • the service information that the AF provides to the PCRF for formulating the PCC rule is based on the transformed IP address and port number in the external packet network.
  • the AF is on the Rx interface.
  • the IP address information in the Diameter message sent to the DRA is different from the IP address information in the Diameter message sent by the PCEF to the DRA on the Gx interface, so that the DRA cannot associate the Rx interface message and the Gx interface message belonging to the same PDN bearer.
  • the correct PCRF cannot be selected, and the PCC policy information cannot be correctly associated.
  • the main object of the present invention is to provide a method and system for determining a policy and a charging rule function, which can correctly select a PCRF and thereby correctly associate PCC policy information.
  • a method of determining policy and charging rule functions including:
  • Diameter protocol routing agent DRA obtains IP address translation information
  • the DRA uses the obtained IP address translation information to perform the policy and charging rule function PCRF selection and association.
  • the method for obtaining the IP address translation information by the DRA is:
  • the DRA obtains an IP address translation information from the Gx interface message of the policy and charging execution function PCEF, in which the PCEF actively carries the IP address translation information;
  • the DRA obtains IP address translation information by querying the PCEF via the Gx interface.
  • the DRA performs PCRF selection and association as:
  • the DRA uses the obtained IP address translation information to map the current private network address information to the public network address information, and performs PCRF selection and association according to the public network address information.
  • the method for obtaining the IP address translation information by the DRA is:
  • the PCEF sends a Diameter session establishment request for the current bearer to the DRA through the Gx interface, and the Diameter session establishment request of the Gx interface carries the address information describing the current bearer and the IP address translation information corresponding to the address information to be carried. ;
  • the DRA obtains IP address translation information from the received Diameter session establishment request.
  • the method for obtaining the IP address translation information by the DRA is:
  • the PCEF sends a Diameter session establishment request for the current bearer to the DRA through the Gx interface, where the Diameter session establishment request of the Gx interface carries the address information describing the current bearer; After receiving the Diameter session establishment request of the Gx interface, the DRA sends a response message by using a Diameter session, and sends an IP address translation information query indication to the PCEF.
  • the PCEF After obtaining the IP address translation information, the PCEF sends a Diameter session establishment request message to the DRA, where the IP address translation information is carried;
  • the DRA obtains IP address translation information from the re-received Diameter session establishment request.
  • the method further includes: the DRA transmitting the obtained IP address translation information to the selected PCRF, and selecting the PCRF to perform association of the service control session.
  • the DRA sends the obtained IP address translation information to the selected PCRF, and the selected PCRF performs the service control session association:
  • the DRA forwards the Diameter session establishment request message to the selected PCRF, and carries the IP address translation information of the bearer in the forwarded proxy Diameter session establishment request;
  • the selected PCRF performs the association and policy decision of the service PCC policy according to the received address information and IP address translation information of the current bearer, and combines the service PCC policy information received from the Rx interface, and executes the PCC policy rule providing process.
  • the DRA forwards the Diameter session establishment response to the corresponding PCEF through the Gx interface, and delivers the PCC rule to the corresponding PCEF.
  • the method further includes: the DRA transmitting the obtained IP address translation information to the selected PCRF, and selecting the PCRF to perform association of the service control session; specifically:
  • the DRA sends a PCRF redirection indication to the PCEF by using a Diameter session establishment response message, where the indication carries the address information of the PCRF selected by the DRA;
  • the PCEF sends a Diameter session establishment request of the currently carried Gx interface to the corresponding PCRF by using the Gx interface according to the address information of the PCRF in the PCRF redirection indication, where the Diameter session establishment request of the Gx interface carries the description of the bearer. Address information, and translation information of the IP address corresponding to the address information of 7;
  • the PCRF performs the association and policy decision of the service PCC policy according to the received bearer address information and the IP address translation information, and combines the service PCC policy information received from the Rx interface, and executes the PCC policy rule providing process to send the corresponding PCEF to the corresponding PCEF.
  • the Diameter session establishes a response message.
  • a system for determining a policy and a charging rule function comprising at least a DRA and a selected PCRF, wherein
  • DRA used to obtain IP address translation information, and use the obtained IP address translation information for PCRF selection and association. Also used to send the obtained IP address translation information to the selected PCRF;
  • the selected PCRF is used to receive the IP address translation information from the DRA, and select the PCRF to perform the association of the service control session.
  • the system also includes a PCEF and a network address translator, wherein
  • the PCEF is configured to carry the IP address translation information in the Gx interface message sent to the DRA; or receive the indication from the DRA to provide the DRA with the IP address translation information.
  • a network address translator for providing IP address translation information to the PCEF.
  • the DRA obtains the IP address translation information, and uses the obtained IP address translation information to perform PCRF selection and association.
  • the DRA correctly selects the PCRF based on the messages on the Rx interface and the Gx interface.
  • the association of PCC policy information is correctly implemented.
  • Figure 1 is a network structure diagram of an existing EPC network
  • Figure 3 is a system architecture diagram of a PCC system in an existing EPC network
  • Figure 4 is a schematic structural diagram of a PCC system in an existing deployment DRA scenario
  • Figure 5 is a schematic diagram of the workflow of the existing DRA as a diameter agent
  • FIG. 6 is a schematic diagram of a workflow of an existing DRA as a parameter redirection function
  • 7 is a schematic diagram of a network structure of an existing IP address translation device deployed in an EPC network
  • FIG. 8 is a flowchart of a method according to the present invention
  • FIG. 9 is a schematic structural diagram of a system applied to the method of the present invention.
  • FIG. 10 is a schematic flow chart of determining a first embodiment of a PCRF according to the present invention.
  • FIG. 11 is a schematic flow chart of determining a second embodiment of a PCRF according to the present invention.
  • Figure 12 is a flow chart showing the third embodiment of determining the PCRF of the present invention. detailed description
  • Figure 8 is a flow chart of the method of the present invention. Under the scenario of simultaneously deploying a network address translator and a DRA, as shown in Figure 8, the following steps are included:
  • Step 800 The DRA obtains the translation information of the IP address.
  • the PCEF actively carries the IP address translation information (that is, the information corresponding to the address translation before and after the address translation) in the Gx interface message sent to the DRA.
  • the DRA actively queries the PCEF to obtain the IP address translation information through the Gx interface.
  • the PCEF can obtain the IP address translation information from the network address translator in a plurality of ways, and the present invention is not limited thereto, and the manner of obtaining the same is not limited to the scope of protection of the present invention.
  • Step 801 The DRA uses the obtained IP address translation information for PCRF selection and association.
  • the DRA uses the obtained IP address translation information to map the current private network address information to the public network address information, and performs PCRF selection and association according to the public network address information. How to perform PCRF selection and association belongs to the prior art, and is not described here.
  • This step emphasizes that the DRA uses the obtained IP address translation information to find the public network address information corresponding to the currently carried private network address information.
  • the network address information ensures the correct selection of the PCRF.
  • the method of the present invention further includes:
  • Step 802 The DRA sends the obtained IP address translation information to the selected PCRF, and selects the PCRF to perform association of the service control session.
  • the PCRF combines the received bearer address information and the IP address translation information with the service PCC policy information received from the Rx interface.
  • the association and policy decisions of the business PCC policy are performed, and then the PCC policy rule providing process is executed.
  • the DRA correctly selects the PCRF according to the message on the Rx interface and the Gx interface. In turn, the association of PCC policy information is correctly implemented.
  • FIG. 9 is a schematic structural diagram of a system applied by the method of the present invention. As shown in FIG. 9, at least a DRA and a selected PCRF are included, wherein
  • DRA used to obtain IP address translation information, and use the obtained IP address translation information for PCRF selection and association. It is also used to send the obtained IP address translation information to the selected PCRF.
  • the selected PCRF is used to receive the IP address translation information from the DRA, and select the PCRF to perform the association of the service control session.
  • the system of the present invention also includes a PCEF and a network address translator, wherein
  • the PCEF is configured to carry the IP address translation information in the Gx interface message sent to the DRA; or receive the indication from the DRA to provide the DRA with the IP address translation information.
  • a network address translator for providing IP address translation information to the PCEF.
  • FIG. 10 is a schematic flowchart of the first embodiment of determining a PCRF according to the present invention.
  • the DRA acts as a Diameter message proxy function unit, and is responsible for forwarding the Diameter message to the corresponding PCRFhunt PCEF actively reporting the IP in the Diameter message of the Gx interface.
  • the address translation information the DRA selects the correct PCRF according to the IP address translation information, and forwards the IP address translation information to the selected PCRF through the Diameter message, and the selected PCRF performs the association of the service control session, as shown in FIG. Includes the following steps:
  • Step 1000 The PCEF sends a Diameter session establishment request for the bearer to the DRA through the Gx interface, where the Diameter session establishment request of the Gx interface carries: Describe the address information of the bearer, such as the source IP address, the destination IP address, and the port number. And the protocol number (also called the quintuple), and also carries the IP address translation information corresponding to the quintuple (ie, the information of the correspondence before and after the address translation).
  • Step 1001 After receiving the Diameter session establishment request of the Gx interface, the DRA searches for or selects a corresponding PCRF according to the obtained address information and IP address translation information of the bearer, and performs Diabian session creation or binding, and simultaneously records Received IP address translation information.
  • the address information of the bearer is obtained as the private network address information
  • the obtained IP address translation information is obtained, that is, the public network address information corresponding to the private network address information of the bearer is obtained according to the corresponding relationship before and after the address translation.
  • the quintuple information of the received private network IP address is translated into the quintuple information of the corresponding public network IP address, and then combined with the public network IP address received from the Rx interface.
  • select PCRF For the quintuple information, select PCRF.
  • Step 1002 The DRA forwards the Diameter session establishment request message to the selected PCRF, and carries the IP address translation information of the bearer in the forwarded proxy Diameter session establishment request.
  • Step 1003 The PCRF translates the received quintuple information of the private network IP address into the quintuple information of the corresponding public network IP address according to the received bearer address information and the IP address translation information (that is, according to the IP address translation information). And performing association and policy decision of the service PCC policy in combination with the service PCC policy information received from the Rx interface, and then executing the PCC policy rule providing process, and sending a Diameter session establishment response message to the DRA as the Diameter message proxy.
  • Step 1004 The DRA forwards the Diameter session establishment response to the corresponding PCEF through the Gx interface, and delivers the PCC rule to the corresponding PCEF.
  • FIG. 11 is a schematic flowchart of a second embodiment of determining a PCRF according to the present invention.
  • the DRA as a redirection function unit of the Diameter message, is responsible for redirecting the message received from the Gx interface to the corresponding PCRF.
  • the PCEF actively reports the IP address translation information in the Diameter message of the Gx port.
  • the DRA selects the correct PCRF according to the IP address translation information and redirects it.
  • the PCEF sends the IP address translation information to the redirected PCRF through the Diameter message. Control the association of sessions. As shown in FIG.
  • Step 1100 The PCEF sends a Diameter session establishment request for the bearer to the DRA through the Gx interface, where the Diameter session establishment request of the Gx interface carries: Describe the address information of the bearer, such as the source IP address, the destination IP address, and the port number. And the protocol number (also called the quintuple), and also carries the IP address translation information corresponding to the quintuple (ie, the information of the correspondence before and after the address translation).
  • the protocol number also called the quintuple
  • Step 1101 After receiving the Diameter session establishment request of the Gx interface, the DRA searches for or selects a corresponding PCRF according to the obtained address information and IP address translation information of the bearer, and performs Diabian session creation or binding, and simultaneously records Received IP address translation information.
  • Step 1102 The DRA sends a PCRF redirection indication to the PCEF through the Diameter session establishment response message, where the indication carries the address information of the PCRF selected by the DRA.
  • Step 1103 The PCEF sends a Diameter session establishment request of the Gx interface of the Gx interface to the corresponding PCRF according to the address information of the PCRF in the PCRF redirection indication, and the Diameter session establishment request of the Gx interface carries:
  • the address information of the bearer such as the source IP address, the destination IP address, the port number pair, and the protocol number (also called the quintuple), and the IP address translation information corresponding to the quintuple (that is, the correspondence between the address translation before and after the address translation) information).
  • Step 1104 The PCRF performs the association and policy decision of the service PCC policy according to the received bearer address information and the IP address translation information, and combines the service PCC policy information received from the Rx interface, and then executes the PCC policy rule providing process to the corresponding
  • the PCEF sends a Diameter session setup response message.
  • FIG. 12 is a schematic flowchart of a third embodiment of determining a PCRF according to the present invention.
  • the DRA functions as a Diameter message proxy function unit, and is responsible for forwarding a Diameter message to a corresponding PCRF.
  • the PCEF does not actively report the IP address translation information on the Gx interface.
  • the DRA can find that the corresponding PCRF cannot be selected and associated according to the bearer address information, and the IP address translation information is obtained by actively sending the Diameter message through the Gx interface. Correct The selection and association of the PCRF is performed. As shown in FIG.
  • Step 1200 The PCEF sends a Diameter session establishment request for a bearer to the DRA through the Gx interface, where the Diameter session establishment request of the Gx interface carries : Describe the address information of the bearer, such as source IP address, destination IP address, port number pair, and protocol number (also called quintuple). In the third embodiment, the IP address translation information corresponding to the quintuple is not carried in the Diameter session establishment request of the Gx interface.
  • Step 1201 After receiving the Diameter session establishment request of the Gx interface, the DRA searches for or selects the corresponding PCRF according to the address information of the bearer, and creates or binds the Diameter session, but the obtained address information is private. The network address information, therefore, DRA is unable to select or correlate PCRF.
  • Step 1202 The DRA establishes a response message through the Diameter session, and actively sends an IP address translation information query indication to the corresponding PCEF, so as to obtain a correspondence between the IP address translation.
  • Step 1203 After receiving the IP address translation information query indication from the DRA, the PCEF may obtain the address translation information from the network address translation device by using various existing methods. The specific implementation of the methods is not within the protection scope of the present invention, and is not limited to The scope of protection of the present invention); after obtaining the IP address translation information, the PCEF resends the Diameter session establishment request message to the DRA, which carries the IP address translation information.

Abstract

La présente invention se rapporte à un procédé et à un système permettant de déterminer une fonction de règles de politique et de facturation. Un agent de routage de diamètre (DRA) acquiert des informations de traduction d'adresse de protocole Internet (IP), sélectionne et associe ensuite la fonction PCRF à l'aide des informations de traduction d'adresse IP acquises. Par la présente invention, dans le cas où un dispositif de traduction d'adresse de réseau et l'agent DRA sont agencés en même temps, l'agent DRA sélectionne correctement la fonction PCRF selon les messages sur une interface de réception (Rx) et une interface Gx. De ce fait, l'association des informations de politique de contrôle de la politique et de la facturation (PCC) est réalisée correctement.
PCT/CN2011/072032 2010-04-26 2011-03-22 Procédé et système permettant de déterminer une fonction de règles de politique et de facturation WO2011134327A1 (fr)

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