WO2011098025A1 - 一种通信系统以及关联业务策略信息的方法 - Google Patents

一种通信系统以及关联业务策略信息的方法 Download PDF

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Publication number
WO2011098025A1
WO2011098025A1 PCT/CN2011/070860 CN2011070860W WO2011098025A1 WO 2011098025 A1 WO2011098025 A1 WO 2011098025A1 CN 2011070860 W CN2011070860 W CN 2011070860W WO 2011098025 A1 WO2011098025 A1 WO 2011098025A1
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Prior art keywords
network address
information
service flow
address translation
translation
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PCT/CN2011/070860
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English (en)
French (fr)
Inventor
周星月
孙默
周晓云
蒋陶
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中兴通讯股份有限公司
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Publication of WO2011098025A1 publication Critical patent/WO2011098025A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24Accounting or billing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/14Charging, metering or billing arrangements for data wireline or wireless communications
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/14Charging, metering or billing arrangements for data wireline or wireless communications
    • H04L12/1453Methods or systems for payment or settlement of the charges for data transmission involving significant interaction with the data transmission network
    • H04L12/1471Methods or systems for payment or settlement of the charges for data transmission involving significant interaction with the data transmission network splitting of costs

Definitions

  • the present invention relates to the field of communications, and in particular to a 3rd Generation Partnership Project (3GPP) packet system, and in particular, to a communication system, and implementing associated service policy information in the system. method.
  • 3GPP 3rd Generation Partnership Project
  • the 3rd Generation Partnership Project (3GPP) Evolved Packet System is an Evolved Universal Terrestrial Radio Access Network (E- UTRAN), Mobility Management Entity (MME), Serving Gateway (S-GW), Packet Data Network Gateway (P-GW or PDN GW), attribution User Subscriber Server (HSS), Policy and Charging Rules Function (PCRF) entity and other supporting nodes.
  • 3GPP 3rd Generation Partnership Project
  • EPS Evolved Packet System
  • E- UTRAN Evolved Universal Terrestrial Radio Access Network
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW or PDN GW Packet Data Network Gateway
  • HSS Policy and Charging Rules Function
  • an E-UTRAN is connected to an MME through an S1-MME, and an MME is connected to an HSS through an S6a;
  • the S-GW is an access gateway device connected to the E-UTRAN, in the E - The data is forwarded between the UTRAN and the P-GW, and is responsible for buffering the paging waiting data.
  • the S-GW is connected to the E-UTRAN through the SI-U, connected to the MME through the S11, and connected to the PCRF through the Gxc, through the S5 and the P.
  • - GW is connected;
  • P-GW is a border gateway between EPS and Packet Data Network (PDN), which is responsible for PDN access, forwarding data between EPS and PDN, etc.
  • PDN Packet Data Network
  • P-GW is connected to PCRF through Gx.
  • the SGi is connected to the IP service provided by the operator; the PCRF is connected to the operator's Internet Protocol (IP) service network interface through the Rx interface to obtain service information, and through the Gx/Gxa/Gxb/Gxc interface and 3GPP
  • IP Internet Protocol
  • the gateway devices in the network are connected, and are responsible for initiating the establishment of an IP bearer, ensuring QoS (Quality of Service, QoS for short), and performing charging control.
  • Figure 2 shows an architectural diagram of an EPS of a 3GPP network deployed with a network address translation device.
  • FIG. 3 is a structural diagram of a Policy and Charging Control (PCC) supporting EPC.
  • PCC Policy and Charging Control
  • the Policy and Charging Enforcement Function resides in the P-GW of the EPS.
  • the PCRF exchanges information with the PCEF through the Gx interface.
  • the S-GW also has a policy control function, called Bearer Binding and Event Reporting Function (BBERF), BBERF and PCRF.
  • BBERF Bearer Binding and Event Reporting Function
  • Information is exchanged between the Gxc interfaces.
  • an application function Application Function, abbreviated as AF
  • UE User Equipment
  • the EPS can provide the charging system with charging information of the bearer layer, including offline charging and online charging.
  • 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 the charging information to the charging system, where the charging identifier (referred to as an access-network-charging-Identifier, also referred to as a bearer layer charging identifier) is used to identify Billing information.
  • the application server can also provide the charging 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).
  • AF-Charging-Identifier 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 must send the respective generated charging identifiers to the other party through the PCRF.
  • the application layer charging identifier AF-Charging-Identifier is carried.
  • the application server sends the charging information identified by the application layer charging identifier (AF-Charging-Identifier) to the charging system
  • the access network identifier Access-Network-Charging-Identifier
  • the charging system can associate the bearer layer with the application layer charging information.
  • the IPv6 transition method was first studied from the 1994 IETF NGTRAN working group. In 1996, 6Bone was established for experiments. In 1998, the first group of IPv6 standard RFCs was released. In 2003, NGTRAN was published. The 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 CNGI Network Deployment Office.
  • the main IPv6 transition technologies used were the main IPv6-related RFCs generated at that time. The transition technologies at that time mainly included three technologies: dual stack, translation and tunneling.
  • the PNAT system solution implements the backward compatibility of the IPv6 host to the common IPv4 application.
  • the IPv4 application can access the IPv6 network through the IPv6 host without the code tampering, and implement the IPv6 to IPv4 translation through the PNAT gateway to implement the remote IPv4 server. access.
  • Figure 4 shows a schematic diagram of a PNAT system deployment.
  • Gateway-initiated DS-LITE Gateway-initiated DS-LITE (Gateway-Initiated DS-LITE, referred to as
  • GI-DS-LITE is an improvement to the DS-LITE solution
  • Figure 5 is a technical schematic of the GI-DS-LITE solution.
  • the UE establishes a mobile tunnel between the S-GW and the P-GW, and establishes a DS-LITE tunnel between the P-GW and the CGN.
  • Different mobile terminals can allocate the same IPv4 address of the system and identify different UEs through the DS-LITE tunnel.
  • NAT translation is performed on the CGN according to the IPv4 address and port number of the terminal, and the DS-LITE tunnel identifier corresponding to the NAT translation is recorded in the NAT table.
  • the CGN corresponds to the public network address in the NAT translation.
  • the private network address of the terminal is matched to the corresponding DS-LITE tunnel according to the DS-LITE tunnel identifier recorded in the NAT table, and the downlink data is encapsulated in the DS-LITE tunnel and sent to the P-GW.
  • the P-GW is based on the established DS.
  • the correspondence between the LITE tunnel and the mobile tunnel takes the data packet out of the DS-LITE tunnel and encapsulates it in the mobile tunnel and sends it to the UE.
  • network address translation between IPv4 and IPv6 is the key to the implementation of many schemes. As shown in FIG. 6, a schematic diagram of a PCC architecture after a network address translation NAT is introduced.
  • the change of session information before and after NAT processing may cause the PCRF to be incorrectly associated when performing a PCC policy.
  • Table 1 shows a kind of Session information before and after NAT64 translation.
  • Table 1 Business Flow Session Information Before and After Translation
  • the technical problem to be solved by the present invention is to provide a communication system, a method for associating service policy information, and a network address translation adaptation device, which can solve the problem that service policy information cannot be associated in a network address translation scenario, especially policy and accounting.
  • the rule function (PCRF) entity cannot relate the service flow information to the information before the network address translation.
  • the present invention provides a method for associating service policy information in a communication system, the method comprising: the network address translation adaptation device acquiring service flow information from an application server, and obtaining a service from the network address translator according to the service flow information The network address translation information of the stream; and the network address translation adaptation device reversely translates the service flow information according to the network address translation information, and sends the reverse translated service flow information to the policy and charging rule function entity.
  • the step of the network address translation adaptation device acquiring the network address translation information of the service flow from the network address translator according to the service flow information includes: The network address translation adaptation device finds a network address translator that generates the source address resource pool through the terminal source address in the service flow session information, and the network address translation adaptation device acquires the network address translation information from the network address translator.
  • the reverse translation performed by the network address translation adaptation apparatus includes a session quintuple of the service flow: a source IP address, a destination IP address, a source port number, a destination port number, and a protocol number for reverse translation .
  • the step of performing reverse translation by the network address translation adaptation apparatus includes: the network address translation adaptation apparatus matches the service flow information of the application server, and reversely translates the matched information into a network address translation process.
  • the network address translation adaptation device is a network device that is deployed independently or in combination with an application server.
  • the present invention also proposes a communication system, which includes: a Policy and Charging Rules Function (PCRF) entity, an Application Server (AF), a Network Address Translator (NAT), and a network address translation.
  • PCRF Policy and Charging Rules Function
  • AF Application Server
  • NAT Network Address Translator
  • the device wherein: the network address translation adaptation device is configured to: obtain service flow information from the application server, obtain network address translation information of the service flow from the network address translator according to the service flow information, and translate the information to the service flow according to the network address The information is reverse translated, and the reverse translated service flow information is sent to the policy and charging rule function entity.
  • the network address translation adaptation device is configured to obtain network address translation information of the service flow from the network address translator according to the service flow information as follows: the source address resource is found by using the terminal source address in the service flow session information. a network address translator of the pool, and obtaining network address translation information from the network address translator.
  • the reverse translation performed by the network address translation adaptation apparatus includes a session quintuple of the service flow: a source IP address, a destination IP address, a source port number, a destination port number, and a protocol number for reverse translation.
  • the network address translation adapting apparatus is configured to perform reverse translation in the following manner: matching service flow information of the application server, and inversely translating the matched information into a network address Translate the business flow information before processing.
  • the network address translation adaptation device is a network device that is deployed independently or in combination with an application server.
  • the present invention further provides a network address translation adaptation apparatus, including: an obtaining module, configured to: obtain service flow information from an application server, and obtain a service flow from a network address translator according to the service flow information. a network address translation information; and a reverse translation module, configured to: reverse translate the service flow information according to the network address translation information, and send the reverse translated service flow information to the policy and charging rule function entity .
  • the reverse translation module is configured to send the reverse translated service flow information to the policy and charging rule function entity through the standard Rx interface of the 3GPP.
  • the obtaining module is configured to obtain network address translation information of the service flow from the network address translator according to the service flow information as follows: the network address of the source address resource pool is found by using the terminal source address in the service flow session information. a translator, and obtaining network address translation information from the network address translator.
  • the reverse translation module is configured to perform reverse translation in the following manner: matching service flow information of the application server, and inversely translating the matched information into service flow information before network address translation processing.
  • the network address translation adaptation device is a network device that is deployed independently or in combination with an application server.
  • the communication system, the network address translation adaptation device and the method for associating service policy information of the present invention may provide matching service information for the policy and charging rule function PCRF, wherein the network address translation adaptation device is based on the network address translator
  • the translation information reversely translates the service data that has been translated by the network address on the application server AF, and the service flow data information after the reverse translation is transmitted to the policy and charging rule function PCRF through the standard Rx interface, that is, the business policy is implemented.
  • Association Realizes the associated business policy information in the network address translation scenario, and the PCRF can flow the service flow.
  • the information is associated with the information before the network address translation.
  • FIG. 1 is an architectural diagram of an EPS of a 3GPP network in a non-roaming state
  • FIG. 2 is an architectural diagram of an EPS of a 3GPP network deploying a network address translation device
  • FIG. 3 is a schematic diagram of a policy charging control PCC architecture
  • Figure 5 is a schematic diagram of a GI-DS-LITE scheme
  • Figure 6 is a schematic diagram of a PCC architecture after NAT is deployed in the prior art
  • Figure 7 is a schematic diagram of the network address translation adaptation apparatus of the present invention deployed separately
  • FIG. 8 is a flow chart showing the modification of the IP-CAN session in the case of a separate deployment of the network address translation adaptation apparatus of the present invention, and the dotted line frame includes the parts that are improved in the existing process after the implementation of the present invention
  • 9 is a schematic diagram of a network address translation adaptation apparatus and an application server AF of the present invention integrated in a PCC architecture
  • FIG. 10 is a flowchart of modifying an IP-CAN session in a network address translation adaptation apparatus and an AF setup scenario of the present invention; .
  • the present invention is directed to the related art in the case of deploying a network address translator, due to the network address
  • the change of the session information before and after the translation causes the policy and the charging rule function to fail to correctly associate the service with the policy, and provides a solution, including a communication system, and a method for associating business policy information in the communication system. As shown in FIG.
  • a communication system of the present invention which includes: Policy and Charging Rules Function (PCRF) entity, Application Server (AF), Network Address Translator (NAT), Network Address Translation Adaptation And a packet data network gateway (P-GW), wherein: the network address translation adaptation device is configured to: obtain service flow information from the application server, and obtain network address translation information of the service flow from the network address translator according to the service flow information, Translating the service flow information according to the network address translation information, and transmitting the reverse translated service flow information to the policy and charging rule function entity.
  • PCRF Policy and Charging Rules Function
  • AF Application Server
  • NAT Network Address Translator
  • P-GW packet data network gateway
  • the method for associating service policy information of the present invention includes: the network address translation adaptation device acquires service flow information from an application server, acquires network address translation information of the service flow from the network address translator according to the service flow information; and translates according to the network address The information reversely translates the service flow information, and sends the reverse translated service flow information to the policy and charging rule function entity.
  • the network address translation adapting apparatus may find a network address translator (NAT) that generates the source address resource pool by using a terminal source address in the service flow session information, so that the network address translation information may be obtained therefrom.
  • NAT network address translator
  • the reverse translation processing performed by the network address translation adaptation apparatus includes, but is not limited to, a session quintuple (source IP address, destination IP address, source port number, destination port number, and protocol number) for the service flow. ) Reverse translation.
  • the network address translation adaptation apparatus can extract the information shown in Table 1 from the NAT information, and match the service flow information sent by the application server (AF), and translate the reverse direction into NAT before processing.
  • Business flow information Specifically, the service flow information is converted from an IPv4 session to an IPv6 session information.
  • the network address translation adaptation device may be deployed independently or in combination with related network elements, for example.
  • the present invention is not limited as long as it can be combined with the application server AF.
  • the communication system and the method for associating service policy information provided by the present invention can provide matching service information for a policy and charging rule function (PCRF) entity, and the invention translates the device according to the network address translation device according to the translation on the network address translator.
  • the information reversely translates the service data that has been translated by the network address on the application server (AF), and the service flow data information after the reverse translation is transmitted to the Policy and Charging Rules Function (PCRF) entity through the standard Rx interface, that is, A business policy association is implemented.
  • PCRF Policy and Charging Rules Function
  • FIG. 8 is a flow chart of IP-CAN session modification when a network address translation adaptation apparatus is separately deployed into a PCC architecture with a NAT mechanism.
  • the UE performs the network service application interaction, and the AF provides the service information.
  • the flowchart for the PCRF to correctly associate each IP data flow included in the service information with the associated bearer layer charging identifier and QoS information includes the following steps 801 to 815:
  • Step 801 The user performs service access and performs application layer interaction with the AF.
  • the network address translator generates session NAT information corresponding to the related service.
  • Step 802 The AF sends the service flow information to the network address translation adaptation device.
  • Step 803 The network address translation adaptation apparatus parses the service flow information, and then determines whether the service flow information needs to be reverse translated.
  • the basis for judging whether reverse translation is required may be configured according to the network, for example, the PCRF configuration attribute according to the purpose of the AF push service flow information. 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 implementation.
  • Step 804 The network address translation adaptation apparatus acquires NAT information of the service flow from the NAT device.
  • the network address translation adaptation device may find the NAT device that generates the source address resource pool by using the UE source address in the service flow session information.
  • the corresponding NAT device can also be found by other methods, and there is no limitation here.
  • Step 805 The network address translation adapting apparatus performs reverse translation processing on the service flow information according to the acquired service flow NAT information.
  • the reverse translation process here includes, but is not limited to, reverse translation of the session quintuple (source IP address, destination IP address, source port number, destination port number, and protocol number) of the service flow.
  • the network address translation adaptation apparatus can extract the information shown in Table 1 from the NAT information, match the service flow information sent by the AF, and translate the service flow information before the NAT processing.
  • the service flow information is converted from an IPv4 session to an IPv6 session information.
  • Step 806 The network address translation adaptation apparatus sends the processed service flow information to the PCRF.
  • Step 807 The PCRF saves the service information and sends an acknowledgement message to the AF.
  • Step 808 The PCRF performs policy decision according to the user's subscription information, network policy, and service information, and formulates PCC rules and QoS rules.
  • Step 809 The PCRF interacts with the BBERF to deliver the QoS rule to the BBERF.
  • the BBERF performs the installation step 810: The PCRF sends a policy charging rule providing message to the PCEF.
  • Step 811 The PCEF performs policy installation.
  • Step 812 Perform credit information interaction between the PCEF and the OCS.
  • Step 813 The PCEF sends an IP-CAN session modification request to the BBERF.
  • Step 814 The BBERF sends an IP-CAN session modification response to the PCEF.
  • Step 815 The PCEF sends a PCC information providing confirmation message to the PCRF.
  • Step 816 The PCRF notifies the AF related bearer event (eg, establishment/release/loss of transmission resources).
  • Step 817 The AF confirms the notification of the step 816 to the PCRF.
  • Embodiment 2 This embodiment describes a scenario in which a network address translation adaptation apparatus and an AF setup are combined.
  • FIG. 9 is a schematic diagram of the network address translation adaptation apparatus and the AF being integrated in the PCC architecture, wherein the network address translation adaptation apparatus is integrated with the application server AF.
  • the network The address translation adaptation device may also be integrated with the NAT translator, and details are not described herein again.
  • FIG. 10 is a flow chart of modifying the IP-CAN session in the network address translation adaptation apparatus and the AF setup scenario described in the present invention. The method includes the following steps: Step 1001: The user performs service access and performs application layer interaction with the AF. In this process, the network address translator generates session NAT information corresponding to the related service.
  • Step 1002 The network address translation adaptation device in the AF acquires NAT information of the related service.
  • Step 1003 The network address translation adaptation apparatus in the AF performs reverse translation processing on the service session on the AF according to the acquired NAT information.
  • Step 1004 The AF sends the processed service data information to the PCRF.
  • Step 1005 The PCRF saves the service information and sends an acknowledgement message to the AF.
  • Step 1006 The PCRF makes policy decisions according to the user's subscription information, network policy, and service information, and formulates PCC rules and QoS rules.
  • Step 1007 The PCRF interacts with the BBERF to deliver the QoS rule to the BBERF. BBERF is installed.
  • Step 1008 The PCRF sends a policy charging rule providing message to the PCEF.
  • Step 1009 The PCEF performs policy installation.
  • Step 1010 Perform credit information interaction between the PCEF and the OCS.
  • Step 1011 The PCEF sends an IP-CAN session modification request to the BBERF.
  • Step 1012 The BBERF sends an IP-CAN session modification response to the PCEF.
  • Step 1013 The PCEF sends a PCC information providing confirmation message to the PCRF.
  • Step 1014 The PCRF notifies the AF related bearer event (eg, establishment/release/loss of transmission resources).
  • Step 1015 The AF confirms the notification of the step 1014 to the PCRF.
  • the embodiment further provides a network address translation adaptation apparatus, including: An obtaining module, configured to: obtain service flow information from an application server, obtain network address translation information of the service flow from the network address translator according to the service flow information; and a reverse translation module, configured to: translate the information according to the network address
  • the service flow information is reverse translated, and the reverse translated service flow information is sent to the policy and charging rule function entity.
  • the reverse translation module is configured to send the reverse translated service flow information to the policy and charging rule function entity through the standard Rx interface of the 3GPP.
  • the obtaining module is configured to obtain network address translation information of the service flow from the network address translator according to the service flow information as follows: the network address of the source address resource pool is found by using the terminal source address in the service flow session information.
  • the reverse translation module is configured to perform reverse translation in the following manner: matching service flow information of the application server, and inversely translating the matched information into service flow information before network address translation processing.
  • the network address translation adaptation device is a network device that is deployed independently or in combination with an application server.
  • the present invention can provide matching service information for the PCRF, wherein the network address translation adaptation device reverse-translates the service data that has been translated by the network address on the AF according to the translation information on the network address translator, after the reverse translation
  • the service flow data information is transmitted to the PCRF through the standard Rx interface, that is, the business policy association is implemented.
  • the present invention implements association service policy information in a network address translation scenario, and the PCRF can associate the service flow information with information before the network address translation.

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Abstract

本发明公开了一种通信系统中关联业务策略信息的方法,该方法包括:网络地址翻译适配装置从应用服务器获取业务流信息,根据业务流信息向网络地址翻译器获取业务流的网络地址翻译信息;以及网络地址翻译适配装置根据所述网络地址翻译信息对业务流信息进行反向翻译,并将反向翻译后的业务流信息发送给策略和计费规则功能实体。本发明还公开了一种通信系统,该通信系统包括:策略和计费规则功能(PCRF)实体,应用服务器(AF),网络地址翻译器(NAT),以及网络地址翻译适配装置。本发明还公开了一种网络地址翻译适配装置。本发明实现了在网络地址翻译场景下关联业务策略信息,PCRF可将业务流信息和网络地址翻译前的信息关联。

Description

一种通信系统以及关联业务策略信息的方法
技术领域 本发明涉及通信领域,具体地,涉及第三代合作伙伴计划(3rd Generation Partnership Project, 简称为 3GPP )分组系统, 特别地, 涉及一种通信系统, 以及该系统中实现关联业务策略信息的方法。
背景技术
第三代合作伙伴计划 ( 3rd Generation Partnership Project, 简称为 3GPP ) 演进的分组系统( Evolved Packet System, 简称为 EPS )由演进的通用陆地无 线接入网 ( Evolved Universal Terrestrial Radio Access Network , 简称为 E-UTRAN ) 、 移动管理单元 ( Mobility Management Entity, 简称为 MME )、 服务网关( Serving Gateway,简称为 S-GW )、分组数据网络网关( Packet Data Network Gateway, 简称为 P-GW或者 PDN GW)、 归属用户服务器(Home Subscriber Server, 简称为 HSS )、 策略和计费规则功能( Policy and Charging Rules Function, 简称为 PCRF ) 实体及其他支撑节点组成。 如图 1所示, 演进的分组系统(EPS ) 中, E-UTRAN通过 S1-MME与 MME相连, MME通过 S6a与 HSS相连; 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, S-GW通过 SI-U与 E-UTRAN相连, 通过 S11与 MME相连, 通 过 Gxc与 PCRF相连, 通过 S5与 P-GW相连; P-GW则是 EPS与分组数据 网 (Packet Data Network, 简称为 PDN )的边界网关, 负责 PDN的接入、 在 EPS与 PDN间转发数据等, P-GW通过 Gx与 PCRF相连, 通过 SGi与运营 商提供的 IP业务相连; PCRF通过 Rx接口与运营商互联网协议(Internet Protocol , 简称为 IP ) 业务网络接口连接, 获取业务信息, 并通过 Gx/Gxa/Gxb/Gxc接口与 3GPP网络中的网关设备相连, 负责发起 IP承载的 建立, 保证业务数据的 QoS ( Quality of Service, 简称为 QoS ) , 并进行计费 控制。 图 2显示了部署有网络地址翻译设备的 3GPP网络的 EPS的架构图。 图 3为支持 EPC的动态策略计费控制( Policy and Charging Control,简称为 PCC ) 的结构图。 策略和计费执行功能 ( Policy and Charging Enforcement Function, 简称为 PCEF )驻留在 EPS的 P-GW中, PCRF与 PCEF间通过 Gx接口交换 信息。 当 P-GW与 S-GW间的接口基于 PMIPv6时, S-GW也存在策略控制 的功能, 称为承载绑定和事件报告功能 ( Bearer Binding and Event Reporting Function , 简称为 BBERF ) , BBERF与 PCRF之间通过 Gxc接口交换信息。 同时, 为用户设备(User Equipment, 简称为 UE )提供业务的应用功能 ( Application Function,简称为 AF )通过 Rx接口向 PCRF发送用于制定 PCC 或 QoS策略的业务信息。
EPS可以向计费系统提供承载层的计费信息,包括离线计费和在线计费。 对于在线计费, 当 UE通过 3GPP接入时, 如图 3所示, 由 P-GW与实时计 费系统(Online Charging System, 简称为 OCS )交互, 进行信用控制。 P-GW 生成计费信息发送给计费系统, 其中包含计费标识 (称为接入网计费标识 ( Access-Network-Charging-Identifier ) , 也可称为承载层计费标识)用以标 识计费信息。 同时应用服务器也可以向计费系统提供应用层的计费信息, 计费信息也 用计费标识进行标识, 称为应用功能计费标识( AF-Charging-Identifier )。 在 现有技术中该计费标识由 AF产生并发送给相关的应用服务器。 为了能使计费系统将用户访问某个业务所产生的承载层计费信息和应用 层计费信息进行关联, P-GW/PCEF和 AF必须通过 PCRF将各自产生的计费 标识发送给对方。 这样当 P-GW/PCEF向计费系统发送用接入网计费标识符 ( Access-Network-Charging-Identifier ) 标识的承载层计费信息时携带应用层 计费标识 AF-Charging-Identifier, 而当应用服务器向计费系统发送用应用层 计费标识符( AF-Charging-Identifier )标识的计费信息时携带接入网计费标识 符 ( Access-Network-Charging-Identifier ) 。 这样, 计费系统就可以将承载层 和应用层计费信息进行关联了。
IPv6过渡方法最早从 1994年 IETF NGTRAN工作组就开始研究, 1996 年建立 6Bone进行实验, 1998年发布第一组 IPv6标准 RFC, 2003年 NGTRAN 工作组关闭, 当时认为可能出现的主流技术都已经完成, 之后 IETF都没有 大批量产生关于 IPv6的 RFC, 中国的 CNGI实验网也是在 2003/2004年达到 第一个高点,当时 CNGI网络部署所釆用的主要 IPv6过渡技术都是当时产生 的主要 IPv6相关的 RFC, 当时的过渡技术主要集中包括:双栈, 翻译和隧道 三种技术。一直到 2007年,随着双栈精简版 (Dual-Stack Lite,简称为 DS-Lite), 承载级网络地址翻译 ( Carrier Grade Network Address Translation, 简称为 CGN ) , 地址加端口 ( Address + Port, 简称为 A+P ) , IPv6到 IPv4的网络地 址转换技术(Network Address Translation 6 to 4, 简称为 NAT64 ) , 基于主 机翻译的 Prefix-NAT等一系列新型过渡技术的提出, IETF在 2008年秋天重 新达成一致将制定新的翻译和隧道技术。
PNAT系统方案实现了 IPv6主机对普通 IPv4应用的后向兼容, IPv4应 用无需进行代码爹改即可通过 IPv6主机接入 IPv6网络并经过 PNAT网关的 进行 IPv6到 IPv4的翻译后实现远端 IPv4 Server的访问。 图 4显示了 PNAT 系统一种部署示意图。 网关发起的双栈精简版 ( Gateway-Initiated DS-LITE , 简称为
GI-DS-LITE )是对 DS-LITE方案的一种改进, 图 5为 GI-DS-LITE方案的技 术示意图。 UE通过 S-GW和 P-GW之间建立移动隧道, P-GW和 CGN之间 建立 DS-LITE 隧道, 不同移动终端可以分配系统相同的 IPv4 地址, 通过 DS-LITE隧道标识不同的 UE。 CGN上根据终端的 IPv4地址和端口号来进行 NAT翻译 , 同时在 NAT表中记录下该 NAT翻译对应的 DS-LITE隧道标识; 对于下行数据包, CGN在 NAT翻译中将公网地址对应到移动终端的私网地 址 , 同时根据 NAT表中记录的 DS-LITE隧道标识匹配到对应的 DS-LITE隧 道, 把下行数据封装在 DS-LITE 隧道中发送给 P-GW, P-GW根据建立的 DS-LITE隧道和移动隧道之间的对应关系将数据包从 DS-LITE隧道中取出封 装在移动隧道中发送给 UE。 在 IPv6迁移的诸多方案中, IPv4和 IPv6之间的网络地址翻译是很多方 案的实施关键。 如图 6所示, 显示了引入网络地址翻译 NAT之后的 PCC架 构示意图, 在这种部署条件下, 由于 NAT处理前后的会话信息的变更会引 起 PCRF在进行 PCC策略时无法正确关联。如下表 1所示, 显示了一种经过 NAT64翻译前后的会话信息。 表 1 : 翻译前后的业务流会话信息
Figure imgf000006_0001
具体来讲,表 1中给出了 NAT将 IPv6会话信息翻译为 IPv4会话信息前 后的业务会话信息内容。 此时 PCRF获得的业务流信息是经过网络地址翻译 NAT处理的, PCRF无法将此业务流信息和网络地址翻译前的信息关联。 因 而, 如何在网络地址翻译场景下关联业务策略信息, 成为需要解决的技术问 题。
发明内容 本发明所要解决的技术问题在于, 提供一种通信系统、 关联业务策略信 息的方法以及一种网络地址翻译适配装置, 解决网络地址翻译场景下业务策 略信息无法关联, 尤其策略和计费规则功能(PCRF )实体无法将业务流信息 和网络地址翻译前的信息关联的问题。 为了解决上述问题, 本发明提出了一种通信系统中关联业务策略信息的 方法, 该方法包括: 网络地址翻译适配装置从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 网络地址翻译适配装置根据所述网络地址翻译信息对业务流信息进行反 向翻译, 并将反向翻译后的业务流信息发送给策略和计费规则功能实体。 其中, 网络地址翻译适配装置根据业务流信息向网络地址翻译器获取业 务流的网络地址翻译信息的步骤包括: 网络地址翻译适配装置通过业务流会话信息中的终端源地址找到产生此 源地址资源池的网络地址翻译器, 以及网络地址翻译适配装置向所述网络地 址翻译器获取网络地址翻译信息。 其中, 所述网络地址翻译适配装置所进行的反向翻译, 包括对业务流的 会话五元组: 源 IP地址, 目的 IP地址, 源端口号, 目的端口号, 以及协议 号进行反向翻译。 其中, 网络地址翻译适配装置所进行的反向翻译的步骤包括: 所述网络地址翻译适配装置将应用服务器的业务流信息进行匹配, 将匹 配后的信息反向翻译为网络地址翻译处理前的业务流信息。 其中, 所述网络地址翻译适配装置是独立部署, 或与应用服务器合设的 网络设备。 为了解决上述问题, 本发明还提出了一种通信系统, 该通信系统包括: 策略和计费规则功能 (PCRF ) 实体, 应用服务器 (AF ) , 网络地址翻译器 ( NAT ) , 以及网络地址翻译适配装置, 其中: 网络地址翻译适配装置设置为: 从应用服务器获取业务流信息, 根据业 务流信息向网络地址翻译器获取业务流的网络地址翻译信息, 根据所述网络 地址翻译信息对业务流信息进行反向翻译, 并将反向翻译后的业务流信息发 送给策略和计费规则功能实体。 其中, 所述网络地址翻译适配装置是设置为按如下方式根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息: 通过业务流会话信息中 的终端源地址找到产生此源地址资源池的网络地址翻译器, 以及向所述网络 地址翻译器获取网络地址翻译信息。 其中, 所述网络地址翻译适配装置所进行的反向翻译包括对业务流的会 话五元组: 源 IP地址, 目的 IP地址, 源端口号, 目的端口号, 以及协议号 进行反向翻译。 其中, 所述网络地址翻译适配装置是设置为按如下方式进行反向翻译: 将应用服务器的业务流信息进行匹配, 将匹配后的信息反向翻译为网络地址 翻译处理前的业务流信息。 其中, 所述网络地址翻译适配装置是独立部署, 或与应用服务器合设的 网络设备。 为了解决上述问题, 本发明还提出了一种网络地址翻译适配装置, 其包 括: 获取模块, 其设置为: 从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 反向翻译模块, 其设置为: 根据所述网络地址翻译信息对业务流信息进 行反向翻译,并将反向翻译后的业务流信息发送给策略和计费规则功能实体。 其中,所述反向翻译模块是设置为通过 3GPP的标准 Rx接口将反向翻译 后的业务流信息发送给策略和计费规则功能实体。 其中, 所述获取模块是设置为按如下方式根据业务流信息向网络地址翻 译器获取业务流的网络地址翻译信息: 通过业务流会话信息中的终端源地址 找到产生此源地址资源池的网络地址翻译器, 以及向所述网络地址翻译器获 取网络地址翻译信息。 其中, 所述反向翻译模块是设置为按如下方式进行反向翻译: 将应用服 务器的业务流信息进行匹配, 将匹配后的信息反向翻译为网络地址翻译处理 前的业务流信息。 其中, 所述网络地址翻译适配装置是独立部署, 或与应用服务器合设的 网络设备。
本发明的通信系统、 网络地址翻译适配装置以及关联业务策略信息的方 法, 可以为策略和计费规则功能 PCRF提供匹配的业务信息, 其中, 网络地 址翻译适配装置根据网络地址翻译器上的翻译信息对应用服务器 AF上的已 经过网络地址翻译的业务数据进行反向翻译, 该反向翻译之后的业务流数据 信息通过标准 Rx接口传送给策略和计费规则功能 PCRF,即实现了业务策略 关联。 实现了在网络地址翻译场景下关联业务策略信息, PCRF 可将业务流 信息和网络地址翻译前的信息关联。
附图概述 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是非漫游状态的 3GPP网络的 EPS的架构图; 图 2是部署网络地址翻译设备的 3GPP网络的 EPS的架构图; 图 3是策略计费控制 PCC架构图; 图 4 ^^于主机翻译的 PNAT系统方案结构图; 图 5是 GI-DS-LITE方案结构图; 图 6是当前技术部署 NAT后的 PCC架构示意图; 图 7是本发明网络地址翻译适配装置单独部署到 PCC架构中的示意图; 图 8是本发明的网络地址翻译适配装置在单独部署情形下的 IP-CAN会 话修改流程图, 虚线框包含的为本发明实施后在现有流程中改进的部分; 图 9是本发明的网络地址翻译适配装置和应用服务器 AF合设在 PCC架 构中的示意图; 图 10 是本发明的网络地址翻译适配装置和 AF合设情形下 IP-CAN 会 话修改流程图。
本发明的较佳实施方式 为使本发明的目的、 技术方案和优点更加清楚, 以下结合附图对本发明 作进一步地详细说明。 需要说明的是, 在不冲突的情况下, 本申请中的实施 例及实施例中的特征可以相互任意组合。 本发明针对相关技术在部署网络地址翻译器的情况下, 由于网络地址翻 译前后的会话信息的变化, 导致策略和计费规则功能无法正确对业务进行策 略关联的问题, 提供一种解决方案, 包括一种通信系统, 一种通信系统中关 联业务策略信息的方法。 如图 7所示, 显示了本发明的一种通信系统, 该系统包括: 策略和计费 规则功能 (PCRF ) 实体, 应用服务器 ( AF ) , 网络地址翻译器 (NAT ) , 网络地址翻译适配装置, 以及分组数据网络网关 (P-GW ) , 其中: 网络地址翻译适配装置设置为: 从应用服务器获取业务流信息, 根据业 务流信息向网络地址翻译器获取业务流的网络地址翻译信息, 根据所述网络 地址翻译信息对业务流信息进行反向翻译, 并将反向翻译后的业务流信息发 送给策略和计费规则功能实体。 这样该通信系统中就可以实现策略和计费规 则功能对业务进行正确的策略关联。 本发明的关联业务策略信息的方法包括: 网络地址翻译适配装置从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 根据所述网络地址翻译信息对业务流信息进行反向翻译, 并将反向翻译 后的业务流信息发送给策略和计费规则功能实体。 其中, 所述网络地址翻译适配装置可以通过业务流会话信息中的终端源 地址找到产生此源地址资源池的网络地址翻译器(NAT ) , 从而可以向其获 取网络地址翻译信息。 其中, 所述网络地址翻译适配装置所进行的反向翻译处理, 包括但不限 于对业务流的会话五元组(源 IP地址, 目的 IP地址, 源端口号, 目的端口 号, 以及协议号)进行反向翻译。 以表 1为例, 所述网络地址翻译适配装置从 NAT信息中可提取表 1所 示的信息, 将应用服务器(AF )发来的业务流信息进行匹配, 反向翻译后为 NAT处理前的业务流信息。具体的,将该业务流信息从 IPv4会话转换为 IPv6 会话信息。
所述网络地址翻译适配装置可以独立部署, 也可以和相关网元合设, 例 如可以和应用服务器 AF合设, 本发明不做限制。 本发明提供的通信系统以及关联业务策略信息的方法, 可以为策略和计 费规则功能(PCRF )实体提供匹配的业务信息, 本发明通过网络地址翻译适 配装置, 根据网络地址翻译器上的翻译信息对应用服务器(AF )上的已经过 网络地址翻译的业务数据进行反向翻译, 该反向翻译之后的业务流数据信息 通过标准 Rx接口传送给策略和计费规则功能(PCRF ) 实体, 即实现了业务 策略关联。
实施例一 图 8是网络地址翻译适配装置单独部署到带有 NAT机制的 PCC架构中 时的 IP-CAN会话修改流程图。 UE进行网络业务应用交互, AF提供业务信 息, PCRF 将业务信息中包含的各 IP数据流与其关联的承载层计费标识和 QoS信息进行正确关联的流程图, 包括如下的步骤 801至步骤 815: 步骤 801 : 用户进行业务访问, 与 AF进行应用层交互。 在此过程中网 络地址翻译器生成相关业务对应的会话 NAT信息。 步骤 802: AF向网络地址翻译适配装置发送业务流信息。 步骤 803: 网络地址翻译适配装置收到业务流信息后进行解析, 判断该 业务流信息是否需要反向翻译。 这里判断是否需要反向翻译的依据可以根据网络配置, 例如根据 AF推 送业务流信息的目的 PCRF配置属性,如果该 PCRF是部署在 NAT转换的网 络中, 则需要对业务流进行反向翻译。 本发明在实现上不做限制。 步骤 804: 网络地址翻译适配装置向 NAT设备获取业务流的 NAT信息。 网络地址翻译适配装置可以通过业务流会话信息中的 UE源地址找到产生此 源地址资源池的 NAT设备。 也可以通过其他方法找到对应的 NAT设备, 这 里不做限制。 步骤 805: 网络地址翻译适配装置根据获取的业务流 NAT信息对业务流 信息进行反向翻译处理。 这里的反向翻译处理包括但不限于对于业务流的会话五元组(源 IP地 址, 目的 IP地址, 源端口号, 目的端口号, 以及协议号)进行反向翻译。 以 表 1为例, 网络地址翻译适配装置从 NAT信息中可提取表 1所示的信息, 将 AF发来的业务流信息进行匹配,反向翻译后为 NAT处理前的业务流信息。 具体的, 将该业务流信息从 IPv4会话转换为 IPv6会话信息。 步骤 806: 网络地址翻译适配装置将处理后的业务流信息发送给 PCRF。 步骤 807: PCRF保存业务信息并向 AF发送确认消息。 步骤 808: PCRF根据用户的签约信息, 网络策略以及业务信息进行策略 决策, 制定 PCC规则和 QoS规则。 步骤 809: PCRF与 BBERF进行交互 ,将 QoS规则下发给 BBERF。 BBERF 进行安装 步骤 810: PCRF向 PCEF发送策略计费规则提供消息。 步骤 811 : PCEF进行策略安装。 步骤 812: PCEF和 OCS之间进行信用信息交互。 步骤 813: PCEF向 BBERF发送 IP-CAN会话修改请求。 步骤 814: BBERF向 PCEF发送 IP-CAN会话修改响应。 步骤 815: PCEF向 PCRF发送 PCC信息提供确认消息。 步骤 816: PCRF通知 AF相关的承载事件(例如传输资源的建立 /释放 / 丟失) 。 步骤 817: AF向 PCRF确认 816步骤的通知。
实施例二 本实施例描述了网络地址翻译适配装置和 AF合设时的情景。 图 9描述的网络地址翻译适配装置和 AF合设在 PCC架构中的示意图, 其中, 所述网络地址翻译适配装置与应用服务器 AF合为一体设置。 该网络 地址翻译适配装置还可与所述 NAT翻译器合为一体设置, 在此不再赘述。 图 10 是本发明描述的网络地址翻译适配装置和 AF合设情形下 IP-CAN 会话修改流程图。 具体包括如下流程: 步骤 1001: 用户进行业务访问, 与 AF进行应用层交互。 在此过程中网 络地址翻译器生成相关业务对应的会话 NAT信息。 步骤 1002: AF中的网络地址翻译适配装置获取相关业务的 NAT信息。 步骤 1003: AF中的网络地址翻译适配装置根据获取的 NAT信息将 AF 上的业务会话进行反向翻译处理。 步骤 1004: AF将处理后的业务数据信息发送给 PCRF。 步骤 1005: PCRF保存业务信息并向 AF发送确认消息。 步骤 1006: PCRF根据用户的签约信息, 网络策略以及业务信息进行策 略决策, 制定 PCC规则和 QoS规则。 步骤 1007: PCRF与 BBERF进行交互, 将 QoS规则下发给 BBERF。 BBERF进行安装。 步骤 1008: PCRF向 PCEF发送策略计费规则提供消息。 步骤 1009: PCEF进行策略安装。 步骤 1010: PCEF和 OCS之间进行信用信息交互。 步骤 1011 : PCEF向 BBERF发送 IP-CAN会话修改请求。 步骤 1012: BBERF向 PCEF发送 IP-CAN会话修改响应。 步骤 1013: PCEF向 PCRF发送 PCC信息提供确认消息。 步骤 1014: PCRF通知 AF相关的承载事件(例如传输资源的建立 /释放 / 丟失) 。 步骤 1015: AF向 PCRF确认 1014步骤的通知。
此外, 本实施例还提供了一种网络地址翻译适配装置, 其包括: 获取模块, 其设置为: 从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 反向翻译模块, 其设置为: 根据所述网络地址翻译信息对业务流信息进 行反向翻译,并将反向翻译后的业务流信息发送给策略和计费规则功能实体。 其中, 所述反向翻译模块是设置为通过 3GPP的标准 Rx接口将反向翻译后的业 务流信息发送给策略和计费规则功能实体。 其中, 所述获取模块是设置为按如下方式根据业务流信息向网络地址翻译器获 取业务流的网络地址翻译信息: 通过业务流会话信息中的终端源地址找到产 生此源地址资源池的网络地址翻译器, 以及向所述网络地址翻译器获取网络 地址翻译信息。 其中, 所述反向翻译模块是设置为按如下方式进行反向翻译: 将应用服 务器的业务流信息进行匹配, 将匹配后的信息反向翻译为网络地址翻译处理 前的业务流信息。 其中, 所述网络地址翻译适配装置是独立部署, 或与应用服务器合设的 网络设备。
以上所述仅为本发明的实施例而已, 并不用于限制本发明, 对于本领域 的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的权利要求 范围之内。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
本发明可以为 PCRF提供匹配的业务信息, 其中, 网络地址翻译适配装 置根据网络地址翻译器上的翻译信息对 AF上的已经过网络地址翻译的业务 数据进行反向翻译, 该反向翻译之后的业务流数据信息通过标准 Rx接口传 送给 PCRF, 即实现了业务策略关联。 而且, 本发明实现了在网络地址翻译 场景下关联业务策略信息, PCRF 可将业务流信息和网络地址翻译前的信息 关联。

Claims

权 利 要 求 书
1、 一种通信系统中关联业务策略信息的方法, 该方法包括: 网络地址翻译适配装置从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 网络地址翻译适配装置根据所述网络地址翻译信息对业务流信息进行反 向翻译, 并将反向翻译后的业务流信息发送给策略和计费规则功能实体。
2、如权利要求 1所述的方法, 其中, 网络地址翻译适配装置根据业务流 信息向网络地址翻译器获取业务流的网络地址翻译信息的步骤包括: 网络地址翻译适配装置通过业务流会话信息中的终端源地址找到产生此 源地址资源池的网络地址翻译器, 以及网络地址翻译适配装置向所述网络地 址翻译器获取网络地址翻译信息。
3、如权利要求 1所述的方法, 其中, 所述网络地址翻译适配装置所进行 的反向翻译, 包括对业务流的会话五元组: 源 IP地址, 目的 IP地址, 源端 口号, 目的端口号, 以及协议号进行反向翻译。
4、如权利要求 1所述的方法, 其中, 网络地址翻译适配装置所进行的反 向翻译的步骤包括: 所述网络地址翻译适配装置将应用服务器的业务流信息进行匹配, 将匹 配后的信息反向翻译为网络地址翻译处理前的业务流信息。
5、如权利要求 1所述的方法, 其中, 所述网络地址翻译适配装置是独立 部署, 或与应用服务器合设的网络设备。
6、 一种通信系统, 该通信系统包括: 策略和计费规则功能(PCRF ) 实 体, 应用服务器(AF ) , 网络地址翻译器(NAT ) , 以及网络地址翻译适配 装置, 其中: 网络地址翻译适配装置设置为: 从应用服务器获取业务流信息, 根据业 务流信息向网络地址翻译器获取业务流的网络地址翻译信息, 根据所述网络 地址翻译信息对业务流信息进行反向翻译, 并将反向翻译后的业务流信息发 送给策略和计费规则功能实体。
7、 如权利要求 6所述的通信系统, 其中, 所述网络地址翻译适配装置是设置为按如下方式根据业务流信息向网络 地址翻译器获取业务流的网络地址翻译信息: 通过业务流会话信息中的终端 源地址找到产生此源地址资源池的网络地址翻译器, 以及向所述网络地址翻 译器获取网络地址翻译信息。
8、如权利要求 6所述的通信系统, 其中, 所述网络地址翻译适配装置所 进行的反向翻译包括对业务流的会话五元组: 源 IP地址, 目的 IP地址, 源 端口号, 目的端口号, 以及协议号进行反向翻译。
9、如权利要求 6所述的通信系统, 其中, 所述网络地址翻译适配装置是 设置为按如下方式进行反向翻译: 将应用服务器的业务流信息进行匹配, 将 匹配后的信息反向翻译为网络地址翻译处理前的业务流信息。
10、 如权利要求 6所述的通信系统, 其中, 所述网络地址翻译适配装置 是独立部署, 或与应用服务器合设的网络设备。
11、 一种网络地址翻译适配装置, 其包括: 获取模块, 其设置为: 从应用服务器获取业务流信息, 根据业务流信息 向网络地址翻译器获取业务流的网络地址翻译信息; 以及 反向翻译模块, 其设置为: 根据所述网络地址翻译信息对业务流信息进 行反向翻译,并将反向翻译后的业务流信息发送给策略和计费规则功能实体。
12、 如权利要求 11所述的装置, 其中, 所述反向翻译模块是设置为通过 3GPP的标准 Rx接口将反向翻译后的业 务流信息发送给策略和计费规则功能实体。
13、 如权利要求 11所述的装置, 其中, 所述获取模块是设置为按如下方式根据业务流信息向网络地址翻译器获 取业务流的网络地址翻译信息: 通过业务流会话信息中的终端源地址找到产 生此源地址资源池的网络地址翻译器, 以及向所述网络地址翻译器获取网络 地址翻译信息。
14、如权利要求 11所述的装置, 其中, 所述反向翻译模块是设置为按如 下方式进行反向翻译: 将应用服务器的业务流信息进行匹配, 将匹配后的信 息反向翻译为网络地址翻译处理前的业务流信息。
15、如权利要求 11所述的装置, 其中, 所述网络地址翻译适配装置是独 立部署, 或与应用服务器合设的网络设备。
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