WO2011097986A1 - Procédé et système d'envoi d'informations de politique pcc - Google Patents

Procédé et système d'envoi d'informations de politique pcc Download PDF

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Publication number
WO2011097986A1
WO2011097986A1 PCT/CN2011/070573 CN2011070573W WO2011097986A1 WO 2011097986 A1 WO2011097986 A1 WO 2011097986A1 CN 2011070573 W CN2011070573 W CN 2011070573W WO 2011097986 A1 WO2011097986 A1 WO 2011097986A1
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WO
WIPO (PCT)
Prior art keywords
information
policy
address
pcc
network address
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PCT/CN2011/070573
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English (en)
Chinese (zh)
Inventor
蒋陶
孙默
周晓云
周星月
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中兴通讯股份有限公司
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Publication of WO2011097986A1 publication Critical patent/WO2011097986A1/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
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • 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 the Evolved Packet System (EPS) technology of the 3rd Generation Partnership Project (3GPP), and particularly relates to a policy and charging control (PCC) in a network address translation scenario.
  • EPS Evolved Packet System
  • 3GPP 3rd Generation Partnership Project
  • PCC policy and charging control
  • Background technique Policy and Charging Control
  • FIG 1 is a schematic diagram of the composition of an existing Evolved Packet System (EPS) of the 3rd Generation Partnership Project (3GPP), as shown in Figure 1, which mainly includes the evolved universal mobile communication system land.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • PDN GW Packet Data Network Gateway
  • HSS Home Subscriber Server
  • PCRF Policy and Charging Rules Function
  • 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 is responsible for The paging waiting data is buffered, and the S-GW is connected to the EUTRAN through the SI-U, connected to the MME through the S11, connected to the PCRF through the Gxc, and connected to the P-GW through the S5; the P-GW is the EPS and the packet data network ( The border gateway of the PDN (Packet Data Network) 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, and is connected to the IP service provided by the operator through the SGi.
  • the PCRF is connected to the IP service through the Rx interface.
  • Carrier Internet Protocol IP, Internet Protocol
  • the service network interface is connected to obtain the service information, and is connected to the gateway device in the 3GPP network through the Gx/Gxa/Gxb/Gxc interface, and is responsible for initiating the establishment of the IP bearer, ensuring the quality of service (QoS, Quality of Service) of the service data, and Perform billing control.
  • QoS Quality of Service
  • FIG. 2 is a schematic diagram of a PCC structure of an existing EPC dynamic policy charging control.
  • a Policy and charging enforcement function (PCEF) resides in a P-GW of an EPS system.
  • the PCRF exchanges information with the PCEF through the Gx interface.
  • the S-GW When the interface between the P-GW and the S-GW is based on PMIPv6, the S-GW also has policy control functions, called bearer binding and event reporting (BBERF, Bearer Binding and Event Reporting).
  • BBERF Bearer Binding and Event Reporting
  • an application function (AF, Application Function) for providing a service to the user equipment (UE) is provided through the Rx interface.
  • the PCRF sends service information for formulating Policy and Charging Control (PCC) or QoS policies.
  • 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
  • the P-GW interacts with the OCS to perform credit control.
  • the P-GW generates the charging information and sends the charging information to the charging system, where the charging identifier is included, and the charging identifier is referred to as an Access-Network-Charging-Identifier, which may also be referred to as a bearer layer meter.
  • Fee identification may also be referred to as a bearer layer meter.
  • 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.
  • the charging identifier is called an application function charging identifier (AF-Charging-Identifier).
  • AF-Charging-Identifier an application function charging identifier
  • the charging identifier is generated by the AF and sent to the relevant application server.
  • the P-GW/PCEF and the AF In order to enable the charging system to associate the bearer layer charging information generated by the user to access a certain service with the application layer charging information, the P-GW/PCEF and the AF must send the respective generated charging identifiers to the other party through the PCRF. In this way, when the P-GW/PCEF sends the bearer layer charging information of the access network charging identifier to the charging system, the AF-Charging-Identifier is carried, and when the application server sends the applicable application function charging to the charging system. Carrying the identified billing information The Access-Network-Charging-Identifier's billing system can associate the bearer layer with the application layer billing information.
  • the IPv6 transition method was first studied in 1994 from the IETF NGTRAN working group. In 1996, 6Bone was established for experimentation. In 1998, the first group of IPv6 standard RFCs was released. In 2003, the NGTRAN working group was closed. At that time, the mainstream technologies that were expected to have been completed were completed. After that, the IETF did not generate RFCs for IPv6 in large quantities. China's CNGI experimental network also reached its first high point in 2003/2004. At that time, the main IPv6 transition technologies used in CNGI network deployment were the main IPv6 related issues at that time. The RFC, the transition technology at that time, mainly focused on: dual stack, translation and tunneling technologies.
  • the current popular IPv6 migration technologies are mainly PNAT technology, GI-DS-LITE technology and NAT64+DNS64 technology.
  • the PNAT technology and the NAT64+DNS64 technology need to deploy an IPv6 address to an IPv4 address address translator between the EPC core network and the external packet data network, and the GI-DS-LITE technology needs to deploy the bearer at the edge of the EPC core network.
  • the Level Network Translation Gateway (CGN) translates between the IPV4 private network address and the IPV4 public network address. Therefore, no matter which IPv6 migration technology needs to change the IP address.
  • the existence of the IP address translation device causes the same PDN connection to carry 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, if the AF is provided to the PCRF for formulating the PCC.
  • the service information of the rule is based on the transformed IP address and port number in the external packet network, and the PCRF needs to formulate and deliver the PCC rule based on the untransformed IP address and port number to the execution unit PCEF of the PCC rule.
  • the PCRF cannot obtain the corresponding information of the IP address translation. Therefore, the PCRF cannot provide the service policy information provided by the AF.
  • the PDN connection dedicated bearer is associated to specify and deliver the PCC rule corresponding to the dedicated bearer to the PCEF. Summary of the invention
  • the main purpose of the present invention is to provide a method and a system for transmitting PCC policy information, which can ensure that the PCRF correctly sends the PCC policy information to the corresponding PCEF.
  • a method for delivering PCC policy information including:
  • the policy and charging rule function unit PCRF determines that the address information related to the received service policy information is translated, and obtains the address of the service policy information that has not been translated by the address according to the network address translation NAT correspondence table generated by the network address translation function entity.
  • the PCRF performs the association and policy decision of the service policy and the charging control PCC policy according to the address information of the service policy information that has not been translated by the address, and executes the PCC policy rule providing process to deliver the PCC rule to the policy and charging execution function PCEF.
  • the PCRF determines that the address information related to the service policy information is untranslated, and the method further includes:
  • the PCRF performs the association and policy decision of the service PCC policy according to the address information, and then executes the PCC policy rule providing process to deliver the PCC rule to the PCEF.
  • a network address translation adapter and a functional entity are disposed in the PCRF;
  • the obtaining the address information of the service policy information that has not been translated by the address includes:
  • the functional entity on the PCRF sends a network address translation information query message carrying the service flow address information that needs to be reverse translated to the network address translation adapter;
  • the network address translation adapter obtains a NAT correspondence table including the service policy address information from the network address translation function entity, and reverse-translates the service flow address information;
  • the network address translation adapter sends a network address translation information query response message carrying the reverse translated service flow information to the functional entity in the PCRF.
  • the network address translation function entity includes: translation of an IPv6 address to an IPv4 address, and/or translation of an IPV4 address to an IPv4 address, and/or translation of an IPv4 address to an IPv6 address.
  • the method of determining includes:
  • the purpose of the service flow information is to be determined by the PCRF configuration attribute. If the PCRF is deployed in the NAT-converted network, it is determined that the address information related to the received service policy information is translated.
  • a system for delivering PCC policy information includes at least a policy and charging rule function unit PCRF, a network address translation function entity, a policy, and a charging execution function PCEF, where
  • the PCRF is configured to determine that the address information related to the received service policy information is translated, and obtain the address information of the service policy information that has not been translated by the address according to the network address translation NAT correspondence table generated by the network address translation function entity;
  • the address information of the service policy information translated by the address, the association between the business policy and the charging control PCC policy, and the policy decision, and the PCC policy rule providing process is sent to the PCEF for the policy and charging execution function PCEF;
  • a network address translation function entity configured to convert an IP address and generate a NAT correspondence table
  • the PCEF which resides in the P-GW, receives the PCC rules sent from the PCRF.
  • the system also includes an AF for sending to the PCRF via the Rx interface for developing a PCC or
  • the PC-resident P-GW is further configured to receive PCC rules from the PCRF, install and execute PCC rules, and initiate an IP-CAN bearer setup, modification, or deletion process as needed.
  • the PCRF is provided with at least a network address translation adapter and a functional unit for processing PCC policy information;
  • the functional unit on the PCRF is configured to receive the service policy information from the AF through the Rx interface, and determine that the address information related to the service policy information is translated, and send an indication notification to the network address translation adapter. Address information from the network address translation adapter, perform association and policy decisions for the service PCC policy, and perform PCC policy rule provisioning The process sends a PCC rule to the PCEF.
  • the network address translation adapter is configured to receive the indication notification, interact with the network address translation function entity, obtain a NAT correspondence table including the service policy address information, and perform reverse translation on the received address information of the service policy information, and obtain the The address information of the service policy information translated by the address is returned to the functional entity on the PCRF.
  • the network address translation function entity is deployed in combination with the P-GW, or is deployed as a separate network function unit;
  • the network address translation function entity is separately deployed, and the network address translation adapter and the network address translation function entity are connected by using a newly added Gxn interface; or
  • the network address translation function entity is deployed in combination with the P-GW, and the network address translation adapter is connected to the network address translation function entity through an existing Gx interface with the PCEF.
  • the network address translation function entity includes: translation of an IPv6 address to an IPv4 address, translation of an IPV4 address to an IPv4 address, and translation of an IPv4 address to an IPv6 address.
  • the service information provided by the AF to the PCRF for formulating the PCC rule is based on the transformed IP address and port number in the external packet network, that is, the network address translation function entity is deployed.
  • the PCRF of the present invention obtains the address information of the service policy information that has not been translated by the address according to the NAT correspondence table generated by the network address translation function entity, and performs the association of the service PCC policy according to the address information of the service policy information that has not been translated by the address.
  • the policy decision, and the implementation of the PCC policy rule providing process to the PCEF to issue PCC rules The PCRF is correctly associated with the service policy information, and the PCC policy information is correctly sent to the corresponding PCEF.
  • FIG. 1 is a schematic diagram of a composition structure of an existing 3GPP EPS
  • 2 is a schematic structural diagram of a PCC that supports existing EPC dynamic policy charging control
  • 3 is a schematic structural diagram of a system for transmitting PCC policy information in the scenario in which a network address translation function entity is deployed separately;
  • Figure 4 is a schematic diagram showing the structure of a system for transmitting PCC policy information in the scenario in which the network address translation function entity and the P-GW are deployed together;
  • FIG. 5 is a flowchart of a method for transmitting PCC policy information according to the present invention.
  • FIG. 6 is a schematic flowchart diagram of an embodiment of sending PCC policy information according to the present invention. detailed description
  • FIG. 3 is a schematic diagram of the structure of a system for transmitting PCC policy information in the scenario in which the network address translation function entity is deployed separately
  • FIG. 4 is a scenario in which the network address translation function entity and the P-GW are deployed in a unified manner.
  • the method mainly includes an AF, a P-GW, a PCRF, and a network address translation function entity, where
  • the AF is used to send service policy information for formulating a PCC or QoS policy to the PCRF through the Rx interface.
  • P-GW where PCEF resides, and information is exchanged between PCEF and PCRF through the Gx interface.
  • the network address translation function entity is used to convert an IP address and generate a NAT correspondence table.
  • the network address translation function entity can be deployed in combination with the P-GW, that is, the network address translation function entity is set in the P-GW (as shown in FIG. 4), or can be deployed as a separate network function unit (as shown in FIG. 3).
  • Network address translation function entities include, but are not limited to, translation of IPv6 addresses to IPv4 addresses, translation of IPV4 addresses to IPv4 addresses, and translation of IPv4 addresses to IPv6 addresses.
  • a PCRF in which at least a network address translation adapter and a functional unit for processing PCC policy information are provided.
  • the network address translation adapter and the network address translation function entity are connected by a new Gxn interface; If the network address translation function entity is deployed in combination with the P-GW, the network address translation adapter can be connected to the network address translation function entity through the existing Gx interface with the PCEF.
  • a functional unit on the PCRF configured to receive the service policy information from the AF through the Rx interface, and determine that the address information related to the service policy information is translated, and send an indication notification to the network address translation adapter;
  • the address information of the adapter is used to perform the association and policy decision of the service PCC policy, and then the PCC policy rule providing process is executed to deliver the PCC rule to the PCEF;
  • a network address translation adapter configured to receive the indication notification, interact with the network address translation function entity by using a Gxn interface or a Gx interface between the network address translation function entity, and obtain a NAT correspondence table including the service policy address information, and receive the The address information of the obtained business policy information is reverse translated, and the address information of the business policy information that has not been translated by the address is obtained and returned to the functional entity on the PCRF.
  • FIG. 5 is a flowchart of a method for sending PCC policy information according to the present invention. As shown in FIG. 5, the method mainly includes:
  • Step 500 The PCRF determines that the address information related to the received service policy information is translated, and obtains the address information of the service policy information that has not been translated by the address according to the NAT correspondence table generated by the network address translation function entity.
  • Step 501 Perform the association and policy decision of the service PCC policy according to the address information of the service policy information that has not been translated by the address, and execute the PCC policy rule providing process to deliver the PCC rule to the PCEF.
  • the service information provided by the AF to the PCRF for formulating the PCC rule is based on the transformed IP address and port number in the external packet network, that is, when the network address translation function entity is deployed, the present invention
  • the PCRF obtains the address information of the service policy information that has not been translated by the address according to the NAT correspondence table generated by the network address translation function entity, and performs the association and policy decision of the service PCC policy according to the address information of the service policy information that has not been translated by the address.
  • the PCC policy rule providing process is executed to deliver PCC rules to the PCEF. promise The PCRF correctly associates the service policy information and correctly sends the PCC policy information to the corresponding PCEF.
  • FIG. 6 is a schematic flowchart of an embodiment of sending PCC policy information according to the present invention.
  • a UE performs network service application interaction, and AF provides service information, and the PCRF uses the network address translation adaptation proposed by FIG. 3 and FIG. 4 of the present invention.
  • the process of implementing the IP data flow included in the service information is correctly associated with the associated bearer layer charging identifier and QoS information. It is assumed that the network address translation function entity is an independent entity in this embodiment, as shown in FIG. step:
  • Step 600 The user performs service access, and performs application layer interaction between the UE and the AF.
  • the network address translation function entity generates an address translation correspondence table of the session corresponding to the related service.
  • Step 601 The AF sends the PCC policy information of the service to the policy formulation and decision unit in the PCRF through the Rx interface, including the address information describing the service flow, such as a quintuple, including the source IP address, the destination IP address, and the source port number. , destination port number and protocol number.
  • the address information describing the service flow such as a quintuple, including the source IP address, the destination IP address, and the source port number. , destination port number and protocol number.
  • Step 602 The policy formulation and decision unit on the PCRF determines whether the network address information in the received service PCC policy information is translated by the address of the network address translation function entity. If it is determined that the network address information is not translated by NAT, step 6031 and step 6041 are performed; otherwise, execution starts from step 6032.
  • the basis of the judgment may be configured according to the network, for example, according to the purpose of the AF push service flow information, the PCRF configuration attribute, if the PCRF is deployed in the NAT translation network, the service flow needs to be reverse translated.
  • the invention is not limited in its specific implementation, nor is it intended to limit the scope of the invention.
  • Step 6031 The PCRF performs the association and policy decision of the service PCC policy according to the address information, and then executes the PCC policy rule providing process to deliver the PCC rule to the PCEF.
  • Step 6041 The PCEF installs and executes the PCC rule, and initiates the process of establishing, modifying, or deleting the IP-CAN bearer as needed. End this process.
  • Step 6032 The policy formulation and decision unit on the PCRF sends a network address translation information query message to the network address translation adapter, where the network address translation information query message carries the service flow address information that needs to be reverse translated.
  • Step 6042 The network address translation adapter interacts with the network address translation function entity by adding a Gxn interface, and obtains a NAT correspondence table including the service policy address information, and reverse-translates the service flow address information.
  • the reverse translation process includes, but is not limited to, reverse translation of the session quintuple (source IP address, destination IP address, source port number, destination port number, protocol number) of the service flow.
  • Table 1 is a correspondence table of original session information and NAT-processed session information.
  • the network address translation adapter can extract the information shown in Table 1 from the NAT information, match the service flow information from the AF, and translate the service flow information before the NAT processing.
  • the service flow address information is converted from IPv4 session information to IPv6 session information.
  • Step 6052 The network address translation adapter sends a network address translation information query response message to the policy formulation and decision unit in the PCRF, where the network address translation information query response message carries the reverse translated service flow information (eg, before NAT translation). The quintuple).
  • Step 6062 The PCRF performs the association and policy decision of the service PCC policy according to the reverse translated service flow address information, and then executes the PCC policy rule providing process to deliver the PCC rule to the PCEF.
  • Step 6072 The PCEF installs and executes the PCC rule, and initiates an IP-CAN bearer setup, modification, or deletion process as needed.
  • the specific implementation of step 5062 and step 5072 belongs to the prior art and is not related to the purpose of the present invention and will not be described in detail herein.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Cette invention concerne un procédé et un système d'envoi d'informations sur la politique de commande et de facturation (Policy and Charging Control/PCC). Lorsque les informations de service qui sont fournies à une fonction de règles de politique et de facturation (Policy and Charging Rules Function/PCRF) par une fonction d'application et qui sont utilisées pour la constitution de règles PCR, sont basées sur l'adresse IP transformée et le numéro de port dans un réseau par paquets extérieur, en d'autres termes, lorsque une fonction de traduction d'adresse de réseau est déployée, la fonction PCRF de l'invention : obtient les informations d'adresse non traduites concernant l'information de politique de service selon une table de correspondance de traduction d'adresses réseau (Network Address translation/NAT) générée par l'entité de la fonction de traduction d'adresses de réseau, exécute une association de politique PCC et d'une décision de politique pour services conformément aux informations d'adresse non traduites de l'information sur la politique de service, et applique les règles de politique PCC en vue de l'envoi de règles PCC à une fonction de mise en œuvre de politique et de facturation (Policy and Charging Enforcement Function/PCEF). Ce système garantit que le fonction PCRF associe les informations de politique du service avec précision et envoie correctement lesdites informations à la fonction PCEF correspondante.
PCT/CN2011/070573 2010-02-11 2011-01-25 Procédé et système d'envoi d'informations de politique pcc WO2011097986A1 (fr)

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