WO2013104234A1 - 一种融合网络中策略控制方法及系统 - Google Patents

一种融合网络中策略控制方法及系统 Download PDF

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Publication number
WO2013104234A1
WO2013104234A1 PCT/CN2012/086759 CN2012086759W WO2013104234A1 WO 2013104234 A1 WO2013104234 A1 WO 2013104234A1 CN 2012086759 W CN2012086759 W CN 2012086759W WO 2013104234 A1 WO2013104234 A1 WO 2013104234A1
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WIPO (PCT)
Prior art keywords
pcrf
policy
session
wlan
access
Prior art date
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PCT/CN2012/086759
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English (en)
French (fr)
Inventor
芮通
周晓云
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US14/371,763 priority Critical patent/US9351325B2/en
Priority to EP12865087.6A priority patent/EP2790455A4/en
Publication of WO2013104234A1 publication Critical patent/WO2013104234A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • 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
    • H04M15/80—Rating or billing plans; Tariff determination aspects
    • H04M15/8038—Roaming or handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0894—Policy-based network configuration management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
    • H04M2215/20—Technology dependant metering
    • H04M2215/2033—WLAN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a policy control method and system in a converged network. Background technique
  • the 3rd Generation Partnership Project (3GPP) Evolved Packet System is an Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network).
  • E-UTRAN Mobility Management Entity
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • HSS Home Subscriber Server
  • AAA 3GPP Authentication, Authorization and Accounting
  • Policy and Charging Rules Function Policy and Charging Rules Function, Referred to as PCRF) entity and other supporting nodes.
  • PCRF Policy and Charging Rules Function
  • the MME is responsible for control planes such as mobility management, non-access stratum signaling processing, and user mobility management context management;
  • the S-GW is an access gateway device connected to the E-UTRAN, The E-UTRAN and the P-GW forward data and are responsible for buffering the paging waiting data.
  • the P-GW is the border gateway of the EPS and Packet Data Network (PDN) network, which is responsible for the PDN connection.
  • PDN Packet Data Network
  • PCRF policy and charging rule function entity, which receives the interface Rx and the carrier network protocol (Internet Protocol, referred to as For the IP) service network, the service information is obtained.
  • IP Internet Protocol
  • it is connected to the gateway device in the network through the Gx/Gxa/Gxc interface, and is responsible for initiating the establishment of the IP bearer and ensuring the quality of service (Quality of Service, referred to as QoS). ) and perform billing control.
  • QoS Quality of Service
  • EPS supports interworking with non-3GPP systems, where interworking with non-3GPP systems is through The S2a/b/c interface is implemented, and the P-GW serves as an anchor point between the 3GPP and the non-3GPP system.
  • non-3GPP systems are classified into trusted non-3GPP IP access and untrusted non-3GPP IP access.
  • Trusted non-3GPP IP access can be directly connected to the P-GW through the S2a interface; untrusted non-3GPP IP access requires an evolved packet data gateway (Evolved Packet Data Gateway, referred to as ePDG, due to untrusted access,
  • the ePDG is mainly responsible for security and is connected to the P-GW.
  • the interface between the ePDG and the P-GW is S2b.
  • the S2c provides user plane-related control between the user equipment (User Equipment, UE for short) and the P-GW.
  • Mobility support which supports Moblie IPv6 Support for Dual Stack Hosts and Routers (DSMIPv6).
  • PCEF Policy Function
  • PCRF Packet Control Function
  • S-GW Bearer Binding and Event Report Function
  • BBERF Bearer Binding and Event Report Function
  • S- The information is exchanged between the GW and the PCRF through the Gxc interface (see Figure 1).
  • BBERF Bearer Binding and Event Report Function
  • the BBERF is also resident in the trusted non-3GPP access gateway.
  • the trusted non-3GPP access gateway exchanges information with the PCRF through the Gxa interface (see Figure 1).
  • the S9 interface functions as an interface between the home PCRF and the visited PCRF, and provides an application function (Application Function, abbreviated as AF) for the UE, and sends the policy and charging control to the PCRF through the Rx interface.
  • Policy and Charging Control (referred to as PCC) policy business information.
  • PCC Policy and Charging Control
  • the corresponding PDN network can be found through the Access Point Name (APN).
  • a connection from a UE to a PDN network is usually referred to as an IP Connectivity Access Network (IP-Access) network.
  • IP-Access IP Connectivity Access Network
  • the BBERF and the PCEF respectively establish a Diameter session with the PCRF, and through these Diameter sessions, the policy charging information and the information for formulating the policy for controlling the IP-CAN session are transmitted.
  • the corresponding BBF (Broadband Forum, Broadband Forum) proposes the Broadband Policy Control Function (BPCF).
  • BPCF Broadband Policy Control Function
  • PEP Policy
  • Policy Policy
  • the policy enforcement point usually resides in a fixed network transport device, for example: BRAS (Broadband Remote Access Server (Broadband Access Server) / BNG (Broadband Network Gateway), implemented according to the corresponding policy formulated by BPCF; AAA stores user subscription information; AF (Application Function) provides policy for BPCF and provides corresponding Business information.
  • BRAS Broadband Remote Access Server
  • BNG Broadband Network Gateway
  • AAA stores user subscription information
  • AF Application Function
  • BPCF Application Function
  • the structure of BPCF is relatively rough, and relevant details are still being further developed.
  • the FMC (Fixed Mobile Convergence) scenario that operators are paying attention to is based on the research on 3GPP and BBF interconnection.
  • both mobile networks and fixed broadband networks such operators hope to provide users with unified policy control, allowing users to access different access methods (for example: mobile networks) 3GPP access, and for fixed networks can be accessed through WLAN access to obtain a consistent service experience.
  • PCRF the policy entity that provides control over the mobile network
  • BPCF the policy entity that provides policy control for the fixed broadband network
  • the PCRF The refinement, and the 3GPP Forum has plans to use the PCRF to implement the functions of the BPCF, so in the following, the subsequent converged policy control entities are named by the PCRF.
  • the user can choose to route the data back to the EPC network, or go directly through the local fixed network transmission device BRAS/BNG.
  • BRAS/BNG the local fixed network transmission device
  • the following three types can be subdivided: 1. Untrusted S2b access, as shown in FIG. 3, the UE accesses through a fixed network device.
  • the IP-Sec tunnel is transmitted between the UE and the ePDG (the ePDG acts as the security gateway), and then the ePDG is connected to the EPS core network.
  • the S2b interface between the ePDG and the P-GW can use the PMIP protocol (Proxy Mobile IP Proxy Mobile IP). Protocol) or GTP (GPRS Tunneling Protocol) protocol.
  • PMIP Proxy Mobile IP Proxy Mobile IP
  • GTP GPRS Tunneling Protocol
  • the untrusted S2c access mode uses a DSMIP tunnel between the UE and the P-GW. In the outer layer of the DSMIP tunnel, an IP-Sec tunnel is also encapsulated.
  • the trusted S2c access mode is still a DSMIP tunnel between the UE and the P-GW. However, because it is a trusted access relationship, there is no ePDG.
  • the technical problem to be solved by the present invention is to provide a policy control method and system in a converged network, which can distinguish between WLAN offload data in a roaming scenario and data routed back to the EPC network, and then issue policy control for the WLAN offload data.
  • the present invention provides a policy control method in a converged network.
  • a visited local policy and a charging rule function learns that a user equipment (UE) is connected through a wireless local area network (WLAN).
  • WLAN wireless local area network
  • H-PCRF home policy and charging rule function
  • a subsession (servlet) serving as the WLAN Offload service is created, and the WLAN Offload indication is carried.
  • the carrying the WLAN Offload indication includes:
  • the method further includes:
  • the H-PCRF learns the established policy and charging control (PCC) policy and/or quality of service (QoS) policy.
  • the V-PCRF learns that the UE accesses the mobile network through the WLAN access mode by: receiving the authentication authorization. a session establishment request sent by a billing (AAA) server;
  • AAA billing
  • IP-CAN IP connection access network
  • P-GW packet data network gateway
  • the trigger sent by the H-PCRF is sent to establish an S9 session establishment request.
  • the triggering condition of the H-PCRF being triggered includes: after receiving the service information of the application function (AF), A PCC needs to be developed for the data of the WLAN Offload connection.
  • AF application function
  • the H-PCRF sends the trigger to establish an S9 session establishment request, where the H-PCRF receives the IP-CAN session establishment request sent by the P-GW, and learns that the UE accesses through the WLAN access mode.
  • the trigger establishment S9 session establishment request is sent to the V-PCRF.
  • the present invention also provides a policy control system in a converged network, including a policy and charging rule function (PCRF), where the PCRF includes a user equipment (UE) access sensing module and a subsession establishing module, where:
  • PCRF policy and charging rule function
  • the UE access sensing module is configured to notify the sub-session establishing module after the UE accesses the mobile network by using a wireless local area network (WLAN) access mode;
  • WLAN wireless local area network
  • the sub-session establishing module is configured to create a sub-session of the WLAN Offload service when the S9 session is established, and carry the WLAN Offload indication.
  • the PCRF further includes a policy formulation delivery module
  • the policy setting and sending module is configured to issue a policy and a charging control (PCC) policy and/or a quality of service (QoS) policy to the sub-session for the WLAN Offload service.
  • PCC charging control
  • QoS quality of service
  • Carrying the WLAN Offload indication including:
  • the UE access sensing module is configured to learn that the UE accesses the mobile network by using a WLAN access mode by:
  • the trigger sent by the H-PCRF is sent to establish an S9 session establishment request.
  • the invention can distinguish between the WLAN offload data in the roaming scenario and the data that is routed back to the EPC network, and then issue policy control for the WLAN offload data.
  • FIG. 1 is a schematic diagram of a system architecture of an EPS according to the related art
  • FIG. 2 is a schematic diagram of a BBF BPCF architecture according to the related art
  • FIG. 3 is a schematic diagram of a UE accessing an EPS core network through an untrusted S2b;
  • FIG. 4 is a schematic diagram of a UE accessing an EPS core network through an untrusted S2c;
  • FIG. 5 is a schematic diagram of a UE accessing an EPS core network through a trusted S2c;
  • Figure 6a shows the roaming scenario of S2b access in the Home Routed scenario
  • Figure 6b shows the roaming scenario of untrusted S2c access in the Home Routed scenario.
  • Figure 6c shows the roaming scenario of trusted S2c access in the Home Routed scenario.
  • Figure 7a shows the roaming scenario of S2b access in the Local Breakout scenario
  • Figure 7b shows the roaming scenario of untrusted S2c access in the Local Breakout scenario
  • Figure 7c shows the roaming scenario of trusted S2c access in the Local Breakout scenario
  • FIG. 8 is a flowchart of S2b access in a Local Breakout scenario in a fixed network sensing situation according to an embodiment of the present invention
  • FIG. 9 is a flowchart of an S2b and an untrusted S2c access in a Home Routed scenario in a case where the fixed network is not perceived according to an embodiment of the present invention
  • FIG. 10 is a flowchart of a trusted S2c access in a Home Routed scenario in a case where the fixed network is not perceived according to an embodiment of the present invention.
  • the present embodiment provides a method for controlling a policy in a converged network, and specifically adopts the following solution:
  • the V-PCRF learns that the UE accesses the mobile network through the WLAN
  • the WLAN is established as a WLAN.
  • the subsession of the Offload service and carries the WLAN Offload indication.
  • the H-PCRF sends the formulated PCC policy to the V-PCRF through the established subsession for the WLAN Offload service.
  • the V-PCRF may carry the WLAN Offload indication in an explicit or implicit manner to indicate that the subsession is for the WLAN Offload:
  • Implicit mode By carrying the WLAN Offload identifier, or the specific subsession ID assigned; Implicit mode: The sub-session does not contain APN information; H-PCRF determines that the sub-session is WLAN by determining that there is no APN information in the sub-session. Offload service.
  • the V-PCRF can learn that the UE accesses the mobile network through the WLAN mode by:
  • a gateway control session establishment request from the ePDG a Gxd session request of the BRAS/BNG; an IP-CAN session request of the P-GW; a trigger for the H-PCRF transmission to establish an S9 session establishment request, and the like.
  • the established PCC policy is sent to the V-PCRF, and the conditions for triggering the PCC rule are sent. If the service information of the AF is received, the PCC of the WLAN Offload connection needs to be established. It is also possible that the contract change trigger conditions include: Receive AF business information, and so on.
  • the S9 interface between the visited V-PCRF and the home H-PCRF is UE-level, that is, all IP-CAN sessions of the UE are placed in one S9 session, due to different The IP-CAN sessions belong to different PDN connections (for example: by different APNs), so the V-PCRF establishes a subsession for the IP-CAN session corresponding to different PDN connections, and will have different subsession IDs.
  • the J3 ⁇ 4 is used to achieve the purpose of distinguishing different PDN connections of different subsession session services.
  • the command layer parameters in the message are delivered (the subsession is not established for the UE-level QoS policy).
  • the H-PCRF delivers PCC policies (including QoS policies and charging policies) for different IP-CAN sessions through subsessions.
  • the WLAN Offload connection does not carry the PDN connection information (there is no APN). Therefore, the WLAN Offload data needs to be distinguished in this scenario, and policy control is issued for the data.
  • the UE accesses the EPS core network through the WLAN wireless mode.
  • the fixed network perceives the UE access.
  • the AAA Proxy is visited.
  • a session can be established to the V-PCRF (optional) to inform the user of the access.
  • the BRAS/BNG of the visited place establishes a session with the V-PCRF, and the request policy (the V-PCRF can also be established to the BRAS/BNG after being triggered by the AAA message). Session, and send a static configuration policy).
  • the V-PCRF establishes an S9 session to the H-PCRF.
  • the V-PCRF needs to establish a subsession for the WLAN Offload.
  • An explicit method the message carries an identifier to inform the H-PCRF that the subsession is for the WLAN Offload, or does not carry the identifier, and is received by the H-PCRF according to the information in the message (for example: no APN information)
  • the subsession is served by the WLAN Offload, and the H-PCRF subsequently transmits the charging and QoS policy information through the subsession session.
  • Step 1 The UE accesses the mobile core network through the wireless WLAN mode to complete the authentication and obtain the address.
  • Step 2 The visited AAA Proxy can establish a session (optional) to the V-PCRF to notify the user of the access.
  • Step 3 The BRAS/BNG of the visited place establishes a session with the V-PCRF to request a policy.
  • the V-PCRF may also establish a session to the BRAS/BNG after receiving the trigger of the AAA proxy message in step 2, and issue a policy.
  • Step 4 The V-PCRF sends an S9 session establishment request to the H-PCRF, and establishes a subsession for the WLAN Offload connection.
  • the V-PCRF may identify the subsession as a WLAN Offload service in an explicit manner, for example, by carrying an identifier, or by assigning a special subsession ID, or by implicitly, according to the information in the message by the H-PCRF ( For example: access type, does not contain APN information) to judge.
  • Step 5 The H-PCRF returns an S9 session establishment response to the V-PCRF.
  • Step 6 The UE initiates IKEv2 authentication, and the authentication passes the ePDG. After the authentication succeeds, the UE obtains the IP address allocated by the mobile network.
  • Step 10 if the PMIP protocol is used between the ePDG and the P-GW, perform the following step 7; if the GTP protocol is used between the ePDG and the P-GW, go to Step 10.
  • Step 7 If the PMIP protocol is used between the ePDG and the P-GW, the ePDG initiates the Gateway.
  • the Control Session establishes a message, triggering the V-PCRF to initiate an S9 session modification request.
  • Step 8 The V-PCRF initiates an S9 session modification request to the H-PCRF. Because the ePDG message carries the APN information when the S2b is accessed, the V-PCRF allocates a subsession ID for the connection, and establishes a subsession.
  • Step 9 The V-PCRF returns an S9 session modification response message to the ePDG.
  • Step 10 If the PMIP protocol is used between the ePDG and the P-GW, the ePDG initiates a Proxy Binding Update message to the P-GW; if the GTP protocol is used between the ePDG and the P-GW, the ePDG The P-GW initiates a create session request message.
  • Step 11 The P-GW initiates an IP-CAN session establishment request.
  • Step 12 If it is a PMIP scenario, since the previous V-PCRF has established a subsession for the APN, it is not necessary to create a new subsession to the H-PCRF; if it is a GTP scenario, the V-PCRF needs to create a new subsession for the APN to the H-PCRF. . Step 13. The V-PCRF returns a response to the P-GW.
  • Step 14 When the H-PCRF is triggered, for example: receiving service information from the AF, it is necessary to formulate a PCC (including: QoS policy and charging policy) for the data of the WLAN Offload connection.
  • a PCC including: QoS policy and charging policy
  • Step 15 The H-PCRF sends the established PCC policy to the V-PCRF through the previously established subsession for the WLAN Offload service.
  • Step 16 After receiving the message, the V-PCRF sends the PCC policy in the subsession to the BRAS/BNG.
  • the UE accesses the EPS core network through the WLAN wireless mode, and the HomeRouted roaming scenario, at which time the P-GW is at the home location.
  • the fixed network does not perceive the access of the UE.
  • the UE accesses the untrusted S2b or the untrusted S2c.
  • the UE needs to initiate authentication to the mobile network.
  • the authentication passes the ePDG. After the AAA of the mobile network passes the authentication of the UE, the authentication succeeds. .
  • the ePDG initiates a Gxb* session to the V-PCRF, and the V-PCRF is triggered to establish an S9 session with the H-PCRF; if the GTP protocol is used between the ePDG and the P-GW, The ePDG sends a create session request to the P-GW, which triggers the V-PCRF to establish an S9 session to the H-PCRF. At this time, even if the WLAN Offload data connection does not have APN information, the V-PCRF needs to establish a subsession for the WLAN Offload.
  • the message carries an identifier to inform the H-PCRF that the subsession is for the WLAN Offload service, or does not carry the identifier, and is received by the H-PCRF according to the information in the message (for example: no APN information)
  • the subsession is served by the WLAN Offload, and the H-PCRF subsequently transmits the charging and QoS policy information through the subsession session.
  • Step 1 The UE accesses the mobile core network through the wireless WLAN to complete the authentication and obtain the address.
  • the authentication is tunnel authentication, that is, the authentication when the tunnel is established to the mobile network, and the authentication passes through the ePDG.
  • the UE If the AAA passes the UE authentication, the UE will return a response to the UE; the UE initiates IKEv2 authentication, and the authentication passes the ePDG. After the authentication succeeds, the UE obtains the IP address allocated by the mobile network.
  • step 2 If the PMIP protocol is used between the ePDG and the P-GW, perform the following step 2; if ePDG Use the GTP protocol with the P-GW and go directly to step 5.
  • Step 2 If the PMIP protocol is used between the ePDG and the P-GW, the ePDG initiates a Gateway Control Session setup message.
  • Step 3 The V-PCRF initiates an S9 session establishment to the H-PCRF.
  • the V-PCRF may identify the subsession as a WLAN Offload service in an explicit manner, for example, by carrying an identifier, or by assigning a special subsession ID, or by implicitly, according to the information in the message by the H-PCRF ( For example: access type, no APN information) to judge.
  • the information in the message by the H-PCRF For example: access type, no APN information
  • Step 4 The V-PCRF returns an S9 session setup response message to the ePDG.
  • Step 5 If the PMIP protocol is used between the ePDG and the P-GW, the ePDG initiates to the P-GW.
  • Proxy Binding Update message If the GTP protocol is used between the ePDG and the P-GW, the ePDG initiates a session creation request message to the P-GW.
  • Step 6 The P-GW initiates an IP-CAN session establishment request.
  • Step 7 If it is a PMIP scenario, the V-PCRF sends an S9 session modification request. Since the V-PCRF has already established a subsession for the APN, there is no need to create a new subsession to the H-PCRF; if it is a GTP scenario, then V The PCRF sends an S9 session establishment request, and a new subsession needs to be created for the APN to the H-PCRF. The establishment process is the same as that of step 3.
  • Step 8 The V-PCRF returns an S9 session establishment/modification response to the P-GW.
  • Step 9 When the H-PCRF is triggered, for example: Receiving service information from the AF, it is necessary to formulate a PCC (including: QoS policy and charging policy) for the data of the WLAN Offload connection.
  • a PCC including: QoS policy and charging policy
  • Step 10 The H-PCRF sends the established PCC policy to the V-PCRF through the previously established subsession for the WLAN Offload service.
  • Step 11 After receiving the message, the V-PCRF sends the PCC policy in the subsession to the BRAS/BNG.
  • the above process is also applicable to the Local Break out roaming scenario, at which point the P-GW is visiting the place.
  • Embodiment 3 The UE accesses the EPS core network through the WLAN wireless mode.
  • the fixed network does not perceive the UE access. Therefore, when the UE accesses through the trusted S2c, the UE needs to initiate authentication to the mobile network, and the authentication does not pass through the ePDG.
  • the P-GW authenticates to the AAA of the mobile network. After the AAA authentication succeeds, the authentication is successful.
  • the H-PCRF triggers the establishment of the S9 session to the V-PCRF, and the V-PCRF is triggered to establish an S9 session to the H-PCRF.
  • the V-PCRF Even if the WLAN Offload data connection does not have the APN information, the V-PCRF also A subsession needs to be established for the WLAN Offload.
  • the message carries an identifier to inform the H-PCRF that the subsession is for the WLAN Offload, or does not carry the identifier, and is received by the H-PCRF according to the information in the message (for example, no APN information).
  • the subsession is served by the WLAN Offload, and the H-PCRF subsequently transmits the charging and QoS policy information through the subsession session.
  • Step 1 The UE accesses the mobile core network through the wireless WLAN to complete the authentication and obtain the address.
  • the authentication is tunnel authentication, that is, the authentication when the tunnel is established to the mobile network, and the authentication passes the P-GW. If the AAA passes the UE authentication, Return a response to the UE.
  • the UE obtains the IP address assigned by the mobile network.
  • Step 2 The UE initiates a binding update to the P-GW.
  • Step 3 The P-GW initiates an IP-CAN session establishment to the H-PCRF.
  • Step 4 The H-PCRF returns an IP-CAN session establishment response to the P-GW.
  • Step 5 The H-PCRF triggers the V-PCRF to establish an S9 session.
  • Step 6 The V-PCRF initiates an S9 session establishment to the H-PCRF.
  • the V-PCRF may identify the subsession as a WLAN Offload service in an explicit manner, for example, by carrying an identifier, or by assigning a special subsession ID, or by implicitly, according to the information in the message by the H-PCRF ( For example: access type, no APN information) to judge.
  • the information in the message by the H-PCRF For example: access type, no APN information
  • Step 7 When the H-PCRF is triggered, for example: Receive service information from the AF, you need to
  • the data of the WLAN Offload connection is formulated into PCC (including: QoS policy and charging policy).
  • Step 8 The H-PCRF sends the established PCC policy to the V-PCRF through the previously established subsession for the WLAN Offload service.
  • Step 9 After receiving the message, the V-PCRF sends the PCC policy in the subsession to the BRAS/BNG for execution.
  • the P-GW is in the visited area, and the P-GW triggers the V-PCRF to establish an S9 session.
  • the embodiment of the present invention further provides a policy control system in a converged network, where the system includes a PCRF, where the PCRF includes a UE access sensing module and a sub-session establishing module, where: the UE access sensing module is configured to After the UE accesses the mobile network by using the WLAN access mode, the sub-session establishing module is notified;
  • the sub-session establishing module is configured to create a sub-session of the WLAN Offload service when the S9 session is established, and carry the WLAN Offload indication.
  • the PCRF further includes a policy formulation delivery module
  • the policy formulation delivery module is configured to formulate a PCC policy and/or when triggered
  • Carrying the WLAN Offload indication including:
  • the UE access sensing module is configured to learn that the UE accesses the mobile network by using a WLAN access mode by:
  • AAA authentication and authorization accounting
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any particular combination of hardware and software.
  • the present invention can distinguish between WLAN offload data in a roaming scenario and data routed back to the EPC network, and then issue policy control for the WLAN offload data.

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Abstract

一种融合网络中策略控制方法，包括，漫游场景下，拜访地策略和计费规则功能（V-PCRF）获知用户设备（UE）通过无线局域网络（WLAN）接入方式接入移动网络后，在向归属地策略和计费规则功能（H-PCRF）建立 S9会话时，创建为 WLAN Offload服务的子会话（subsession），并携带 WLAN Offload指示。采用本发明，能够区分漫游场景下的WLAN offload数据与路由回到 EPC网络的数据，进而为 WLAN offload数据下发策略控制。

Description

一种融合网络中策略控制方法及系统
技术领域
本发明涉及移动通信领域， 尤其涉及一种融合网络中策略控制方法及系 统。 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 ) 由演进的通用移动通 信系统陆地无线接入网 （ 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 ) 、 3GPP 的认证授权计费 ( Authentication、 Authorization and Accounting , 简称为 AAA )月良务器， 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。
图 1是根据相关技术的 EPS的系统架构示意图。 如图 1所示， MME负 责移动性管理、 非接入层信令的处理和用户移动管理上下文的管理等控制面 的相关工作； S-GW是与 E-UTRAN相连的接入网关设备， 在 E-UTRAN和 P-GW之间转发数据， 并且负责对寻呼等待数据进行緩存； P-GW则是 EPS 与分组数据网络（ Packet Data Network, 简称为 PDN ) 网络的边界网关， 负 责 PDN的接入及在 EPS与 PDN间转发数据等功能； S-GW和 P-GW都属于 核心网网关； PCRF是策略和计费规则功能实体， 其通过接收接口 Rx和运营 商网络协议（Internet Protocol, 简称为 IP )业务网络相连， 获取业务信息， 此外， 其通过 Gx/Gxa/Gxc接口与网络中的网关设备相连， 负责发起 IP承载 的建立， 保证业务数据的服务质量（Quality of Service, 简称为 QoS ) , 并进 行计费控制。
EPS支持与非 3GPP系统的互通， 其中， 与非 3GPP系统的互通是通过 S2a/b/c接口实现， P-GW作为 3GPP与非 3GPP系统间的锚点。 在 EPS的系 统架构图中， 非 3GPP系统被分为可信任非 3GPP IP接入和不可信任非 3GPP IP接入。 可信任非 3GPP IP接入可直接通过 S2a接口与 P-GW连接； 不可信 任非 3GPP IP接入需经过演进的分组数据网关（ Evolved Packet Data Gateway, 简称为 ePDG, 由于是不可信的接入， ePDG此时主要负责安全）与 P-GW相 连， ePDG与 P-GW间的接口为 S2b; S2c提供了用户设备 ( User Equipment, 简称为 UE )与 P-GW之间的用户面相关的控制和移动性支持，其支持的移动 性管理协议为支持双栈的移动 IPv6 ( Moblie IPv6 Support for Dual Stack Hosts and Routers , 简称为 DSMIPv6 ) 。
在 EPS系统之中，策略和计费执行功能（ Policy and Charging Enforcement
Function, 简称为 PCEF )实体存在于 P-GW中， PCRF与 P-GW之间 Gx接口 (见图 1 )交换信息。 当 P-GW与 S-GW间的接口基于 PMIPv6时， S-GW也 具有承载绑定和事件报告功能 ( Bearer Binding and Event Report Function, 简 称为 BBERF ) 实体对业务数据流进行 QoS控制， S-GW与 PCRF之间通过 Gxc接口 （见图 1 )交换信息。 当通过可信任非 3GPP接入系统接入时， 可信 任非 3GPP接入网关中也驻留 BBERF。 可信任非 3GPP接入网关与 PCRF之 间通过 Gxa接口（见图 1 )交换信息。当 UE漫游时， S9接口作为归属地 PCRF 和拜访地 PCRF的接口，同时为 UE提供业务的应用功能（ Application Function, 简称为 AF ) ,通过 Rx接口向 PCRF发送用于制定策略和计费控制（ Policy and Charging Control, 简称为 PCC )策略的业务信息。 在 3GPP中， 通过接入点 名称（ Access Point Name , 简称为 APN )可以找到对应的 PDN网络。 通常将 UE到 PDN网络的一个连接称为一个 IP连接接入网 （ IP Connectivity Access Network, 简称为 IP-CAN )会话。 在建立 IP-CAN会话的过程中， BBERF和 PCEF分别与 PCRF之间建立 Diameter会话， 通过这些 Diameter会话来传送 对这个 IP-CAN会话进行控制的策略计费信息和用于制定策略的信息等。
与之对应的 BBF ( Broadband Forum, 宽带论坛 )提出了宽带策略控制架 构 BPCF ( Broadband Policy Control Function, 宽带策略控制功能） ， 具体如 图 2所示， BPCF主要功能是制定相应的策略； PEP ( Policy Enforcement Point, 策略执行点）通常驻留在固网传输设备中， 例如： BRAS ( Broadband Remote Access Server, 宽带接入服务器） /BNG ( Broadband Network Gateway, 宽带 网关）， 根据 BPCF制定的相应策略进行执行； AAA储存用户签约信息； AF ( Application Function, 业务应用功能）为 BPCF制定策略， 提供相应的业务 信息。 目前 BPCF的架构还比较粗略， 相关细节还在进一步的制定中。
现在运营商很关注的 FMC ( Fixed Mobile Convergence, 固网移动融合 ) 场景， 就是基于对 3GPP和 BBF互联互通进行研究。 尤其对于一些规模较大 的运营商， 同时拥有移动网络和固定宽带网络， 这类运营商希望能够为用户 提供统一的策略控制， 让用户能够在通过不同的接入方式（例如： 移动网络 时是 3GPP接入， 而对于固定网络可以是通过 WLAN接入）接入后获得一致 的业务体验。 为了能够提供统一的策略控制， 对 PCRF (移动网络提供控制的 策略实体）和 BPCF (固定宽带网络提供策略控制的策略实体）的融合也提出 了需求， 由于目前的 BBF论坛没有对 BPCF如何实现进行细化， 而 3GPP论 坛有计划使用 PCRF实现 BPCF的功能， 因而在下文中， 将后续融合的策略 控制实体用 PCRF命名。 当用户开展业务时， 用户可以选择将数据路由回到 EPC网络， 或是通过 本地固网传输设备 BRAS/BNG直接出去。 对于用户通过 BBF固网接入移动 核心网的场景 （例如： WLAN方式接入）可以细分以下三类： 1、 不可信任 S2b接入， 如图 3所示， UE通过固网设备接入， UE和 ePDG ( ePDG充当安 全网关）之间建立 IP-Sec隧道传输数据， 再通过 ePDG接入到 EPS核心网， ePDG和 P-GW之间的 S2b接口可以使用 PMIP协议（ Proxy Mobile IP代理移 动 IP协议）或是 GTP ( GPRS Tunneling Protocol )协议， ePDG和 PCRF之间 可能会存在 Gxb*接口 （该接口用户传递用户接入的隧道信息） 。 2、 不可信 任的 S2c接入方式， 如图 4所示 , 此时 UE和 P-GW之间釆用 DSMIP隧道， 在 DSMIP隧道的外层， 还会封装一层 IP-Sec隧道， 该隧道是在 UE和 ePDG 之间， 此时 ePDG和 P-GW之间没有隧道。 3、 可信任的 S2c接入方式， 如图 5所示 , 此时 UE和 P-GW之间仍然是 DSMIP隧道， 但由于是可信任的接入 关系， 此时不存在 ePDG。
当 UE漫游到拜访地，对于路由到 EPC核心网的业务会有两种方式： Home Routed (如图 6a,6b,6c )和 Local Breakout (如图 7a,7b,7c ) , 区别在于 P-GW 的位置处于归属地还是拜访地。 但进行 WLAN Offload连接时， 这部分数据 总是通过拜访地的 BRAS/BNG路由出去的。
对于这种漫游场景下既有 WLAN Offload数据， 又有路由回到 EPC网络 的数据同时存在的情况下， 现有技术中无法区分这两部分数据， 从而无法对 这两种数据做计费和策略控制。
发明内容
本发明解决的技术问题是提供一种融合网络中策略控制方法及系统， 能 够区分漫游场景下的 WLAN offload数据与路由回到 EPC网络的数据， 进而 为 WLAN offload数据下发策略控制。
为解决上述技术问题， 本发明提供了一种融合网络中策略控制方法， 漫游场景下， 拜访地策略和计费规则功能 (V-PCRF)获知用户设备 (UE)通 过无线局域网络 (WLAN)接入方式接入移动网络后，在向归属地策略和计费规 则功能 (H-PCRF)建立 S9 会话时， 创建为 WLAN Offload服务的子会话 (subsession), 并携带 WLAN Offload指示。
所述携带 WLAN Offload指示， 包括：
携带 WLAN Offload标识；
携带特定的 subsession ID; 或者，
不携带接入点名称 (APN)信息。
所述方法还包括：
所述 H-PCRF将制定的策略和计费控制 (PCC)策略和 /或服务质量 (QoS)策 所述 V-PCRF通过以下方式获知 UE通过 WLAN接入方式接入移动网络： 收到认证授权计费 （AAA )服务器发送的建立会话请求；
收到宽带接入服务器或宽带网关发送的建立会话请求；
收到演进的分组数据网关 (ePDG)发送的网关控制会话建立请求； 收到分组数据网络网关 (P-GW)的 IP连接接入网 (IP-CAN)会话请求； 或 者，
收到所述 H-PCRF发送的触发建立 S9会话建立请求。
所述 H-PCRF在受到触发后， 将制定的 PCC策略下发给所述 V-PCRF; 其中， 所述 H-PCRF受到触发的触发条件包括： 收到应用功能（AF ) 的 业务信息后， 需要对 WLAN Offload连接的数据制定 PCC。
所述 H-PCRF通过如下方式发送所述触发建立 S9会话建立请求， 包括： 所述 H-PCRF收到 P-GW发送的 IP-CAN会话建立请求，获知所述 UE通 过 WLAN接入方式接入移动网络时， 则向所述 V-PCRF发送所述触发建立 S9会话建立请求。
本发明还提供了一种融合网络中策略控制系统， 包括策略和计费规则功 能 ( PCRF ) , 所述 PCRF包括用户设备 ( UE )接入感知模块和子会话建立模 块， 其中：
所述 UE接入感知模块设置成获知 UE通过无线局域网络（ WLAN )接入 方式接入移动网络后， 通知所述子会话建立模块；
所述子会话建立模块设置成在建立 S9会话时， 创建为 WLAN Offload服 务的子会话， 并携带 WLAN Offload指示。
所述 PCRF还包括策略制定下发模块，
所述策略制定下发模块设置成在受到触发时， 将制定的策略和计费控制 ( PCC )策略和 /或服务质量（QoS )策略通过所述为 WLAN Offload服务的 子会话进行策略下发。
携带所述 WLAN Offload指示， 包括：
携带 WLAN Offload标识；
携带特定的 subsession ID; 或者，
不携带接入点名称（APN )信息。
所述 UE接入感知模块是设置成， 通过以下方式获知 UE通过 WLAN接 入方式接入移动网络：
收到认证授权计费 （AAA )服务器发送的建立会话请求； 收到宽带接入服务器或宽带网关发送的建立会话请求；
收到演进的 ePDG发送的网关控制会话建立请求；
收到 P-GW的 IP-CAN会话请求； 或者，
收到所述 H-PCRF发送的触发建立 S9会话建立请求。
釆用本发明，能够区分漫游场景下的 WLAN offload数据与路由回到 EPC 网络的数据， 进而为 WLAN offload数据下发策略控制。 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为根据相关技术的 EPS的系统架构示意图；
图 2为根据相关技术的 BBF BPCF架构示意图；
图 3为 UE通过不可信任 S2b接入 EPS核心网示意图；
图 4为 UE通过不可信任 S2c接入 EPS核心网示意图；
图 5为 UE通过可信任 S2c接入 EPS核心网示意图；
图 6a为 Home Routed场景下 S2b接入的漫游场景；
图 6b为 Home Routed场景下不可信任 S2c接入的漫游场景；
图 6c为 Home Routed场景下可信任 S2c接入的漫游场景；
图 7a为 Local Breakout场景下 S2b接入的漫游场景；
图 7b为 Local Breakout场景下不可信任 S2c接入的漫游场景；
图 7c为 Local Breakout场景下可信任 S2c接入的漫游场景；
图 8为本发明实施例的固网感知情况下 Local Breakout场景下 S2b接入时 流程图；
图 9为本发明实施例的固网不感知情况下 Home Routed场景下 S2b和不 可信任 S2c接入时流程图； 图 10为本发明实施例的固网不感知情况下 Home Routed场景下可信任 S2c接入时流程图。
本发明的较佳实施方式
本实施方式提供一种融合网络中策略控制方法， 具体釆用如下方案： 漫游场景下， V-PCRF获知 UE通过 WLAN方式接入移动网络后， 在向 H-PCRF建立 S9会话时， 建立为 WLAN Offload服务的子会话 (subsession), 并携带 WLAN Offload指示。
此后， H-PCRF将制定的 PCC策略通过建立的为 WLAN Offload服务的 subsession发送给所述 V-PCRF。
其中， V-PCRF可以通过显式方式或隐式方式携带 WLAN Offload指示， 以指示该 subsession是为 WLAN Offload服务的：
显式方式：通过携带 WLAN Offload标识、或分配的特定的 subsession ID; 隐式方式： 该子会话中不包含 APN信息； H-PCRF通过判断子会话中没 有 APN信息， 得知该子会话为 WLAN Offload服务。
进一步地， V-PCRF可通过以下方式获知 UE通过 WLAN方式接入移动 网络：
收到来自 ePDG的网关控制会话建立请求； BRAS/BNG的 Gxd会话请求； P-GW的 IP-CAN会话请求； H-PCRF发送的触发建立 S9会话建立请求， 等。
进一步地， H-PCRF受到触发后， 将制定的 PCC策略下发给 V-PCRF, 触发 PCC规则下发的条件比较多， 如收到 AF的业务信息后， 需要对 WLAN Offload连接的数据制定 PCC; 也有可能签约变化触发条件包括： 收到 AF的 业务信息， 等。
为使本发明的目的、 技术方案和优点更加清楚明白， 下文中将结合附图 对本发明的实施例进行详细说明。 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。 在漫游场景下，拜访地的 V-PCRF和归属地的 H-PCRF之间的 S9接口是 UE级别的， 也就是说该 UE的所有的 IP-CAN会话都放在一个 S9会话中， 由于不同的 IP-CAN会话属于不同的 PDN连接 (例如： 通过不同的 APN来 区分） ， 因此 V-PCRF 为不同的 PDN 连接所对应的 IP-CAN会话建立 subsession, 并会分西己不同的 subsession ID, 以 J¾来达到区分不同的 subsession 会话服务不同的 PDN连接的目的； 而对于 UE级别的 QoS策略， 通过消息中 的命令层参数下发（不会为 UE级别的 QoS策略传递建立 subsession )。 H-PCRF 针对不同的 IP-CAN会话下发 PCC策略（包括 QoS策略和计费策略）也是通 过 subsession。 由于 FMC场景下， WLAN Offload连接没有携带 PDN连接信 息 （没有 APN ) , 因此， 需要在这种场景下区分 WLAN Offload数据， 并为 该数据下发策略控制。
实施例一
UE通过 WLAN无线方式接入 EPS核心网 , 此时固网感知到 UE接入， 当 UE通过固网设备完成接入认证 (认证过程经过漫游地 AAA proxy到本地 AAA Server )后 , 拜访地 AAA Proxy可以向 V-PCRF建立会话 (可选 ) , 通 知用户接入，拜访地的 BRAS/BNG向 V-PCRF建立会话，请求策略（ V-PCRF 也可以在受到 AAA消息的触发后向 BRAS /BNG建立会话， 并下发静态配置 策略） 。 V-PCRF向 H-PCRF建立 S9会话， 即使此时 WLAN Offload数据连 接没有 APN信息， V-PCRF也需要为该 WLAN Offload建立 subsession。 一种 显式方式，消息中携带标识告知 H-PCRF该 subsession是为 WLAN Offload服 务的， 或是不携带标识， 由 H-PCRF收到消息后根据消息中的信息 （例如： 没有 APN信息）判断出该 subsession是服务于 WLAN Offload, H-PCRF后续 通过该 subsession会话传递计费和 QoS策略信息。
如图 8所示， 本实施例流程具体描述如下：
步骤 1、 UE通过无线 WLAN方式接入移动核心网， 完成认证和获得地 址。
步骤 2、 拜访地 AAA Proxy可以向 V-PCRF建立会话（可选） ， 通知用 户接入。 步骤 3、 拜访地的 BRAS/BNG向 V-PCRF建立会话， 请求策略。
可选地， V-PCRF也可以在收到步骤 2 的 AAA proxy消息的触发后向 BRAS /BNG建立会话， 并下发策略。
步骤 4、 V-PCRF向 H-PCRF发送 S9会话建立请求， 并为 WLAN Offload 连接 J建 subsession。
此步骤中， V-PCRF 可以通过显式方式， 例如携带标识， 或通过分配特 殊的 subsession ID来标识该 subsession为 WLAN Offload服务；或是通过隐式 方式， 由 H-PCRF根据消息中的信息 （例如： 接入类型， 不包含 APN信息） 来判断。
步骤 5、 H-PCRF向 V-PCRF返回 S9会话建立响应。
步骤 6、 UE发起 IKEv2认证， 认证经过 ePDG, 认证成功后， UE获得移 动网络分配的 IP地址。
该步骤后，如果 ePDG和 P-GW之间釆用 PMIP协议，则执行以下步骤 7； 如果 ePDG和 P-GW之间釆用 GTP协议， 则直接执行步骤 10。
步骤 7、 如果 ePDG和 P-GW之间釆用 PMIP协议， ePDG发起 Gateway
Control Session (网关控制会话 )建立消息， 触发 V-PCRF发起 S9会话修改 请求。
步骤 8、 V-PCRF向 H-PCRF发起 S9会话修改请求， 由于 S2b接入时， ePDG的消息中携带 APN信息， 因此 V-PCRF为这个连接分配 subsession ID , 并 J建 subsession。
步骤 9、 V-PCRF向 ePDG返回 S9会话修改响应消息。
步骤 10、 如果 ePDG和 P-GW之间釆用 PMIP协议， 则 ePDG向 P-GW 发起 Proxy Binding Update (代理绑定更新） 消息； 如果 ePDG和 P-GW之间 釆用 GTP协议， 则 ePDG向 P-GW发起创建会话请求消息。
步骤 11、 P-GW发起 IP-CAN会话建立请求。
步骤 12、 如果是 PMIP场景， 由于之前 V-PCRF已经为给 APN建立了 subsession,此时不需要向 H-PCRF新建 subsession;如果是 GTP场景， V-PCRF 需要为该 APN向 H-PCRF新建 subsession。 步骤 13、 V-PCRF向 P-GW返回响应。
步骤 14、 当 H-PCRF受到触发， 例如： 收到来自 AF的业务信息， 需要 对 WLAN Offload连接的数据制定 PCC (包括： QoS策略和计费策略 ) 。
步骤 15、 H-PCRF将制定的 PCC策略通过之前建立的为 WLAN Offload 服务的 subsession发送给 V-PCRF。
步骤 16、 V-PCRF 收到消息后， 将 subsession 中的 PCC 策略下发给 BRAS/BNG执行。
需要说明的是， 上述流程对于 HomeRouted场景下也同样适用。
实施例二
UE通过 WLAN无线方式接入 EPS核心网， HomeRouted漫游场景， 此 时 P-GW在归属地。 固网不感知到 UE接入， UE通过不可信 S2b接入或是不 可信 S2c接入， UE需要向移动网络发起认证， 认证经过 ePDG, 当移动网络 的 AAA通过 UE的认证后，返回认证成功。如果 ePDG和 P-GW之间釆用 PMIP 协议， ePDG向 V-PCRF发起 Gxb*会话， V-PCRF受到触发向 H-PCRF建立 S9会话； 如果 ePDG和 P-GW之间釆用 GTP协议， 则 ePDG向 P-GW发送创 建会话请求，触发 V-PCRF向 H-PCRF建立 S9会话。此时，即使 WLAN Offload 数据连接没有 APN信息， V-PCRF也需要为该 WLAN Offload建立 subsession。 一种显式方式，消息中携带标识告知 H-PCRF该 subsession是为 WLAN Offload 服务的， 或是不携带标识， 由 H-PCRF收到消息后根据消息中的信息 (例如： 没有 APN信息）判断出该 subsession是服务于 WLAN Offload, H-PCRF后续 通过该 subsession会话传递计费和 QoS策略信息。
如图 9所示， 本实施例流程具体描述如下：
步骤 1、 UE通过无线 WLAN方式接入移动核心网， 完成认证和获得地 址，该认证是隧道认证，即在向移动网络建立隧道时的认证，认证经过 ePDG。
其中， 如果 AAA通过 UE认证， 则会向 UE返回响应； UE发起 IKEv2 认证， 认证经过 ePDG, 认证成功后， UE获得移动网络分配的 IP地址。
如果 ePDG和 P-GW之间釆用 PMIP协议，则执行以下步骤 2;如果 ePDG 和 P-GW之间釆用 GTP协议， 直接转到步骤 5。
步骤 2、如果 ePDG和 P-GW之间釆用 PMIP协议，则 ePDG发起 Gateway Control Session (网关控制会话）建立消息。
步骤 3、 V-PCRF向 H-PCRF发起 S9会话建立。
此步骤中， V-PCRF 可以通过显式方式， 例如携带标识， 或通过分配特 殊的 subsession ID来标识该 subsession为 WLAN Offload服务；或是通过隐式 方式， 由 H-PCRF根据消息中的信息（例如： 接入类型， 没有 APN信息）来 判断。
步骤 4、 V-PCRF向 ePDG返回 S9会话建立响应消息。
步骤 5、 如果 ePDG和 P-GW之间釆用 PMIP协议 , ePDG向 P-GW发起
Proxy Binding Update (代理绑定更新） 消息； 如果 ePDG和 P-GW之间釆用 GTP协议， ePDG向 P-GW发起创建会话请求消息。
步骤 6、 P-GW发起 IP-CAN会话建立请求。
步骤 7、 如果是 PMIP场景， 则 V-PCRF发送 S9会话修改请求， 由于之 前 V-PCRF 已经为给 APN建立了 subsession, 此时不需要向 H-PCRF新建 subsession, ； 如果是 GTP场景， 则 V-PCRF发送 S9会话建立请求， 且需要 为该 APN向 H-PCRF新建 subsession, 其建立过程与步骤 3相同。
步骤 8、 V-PCRF向 P-GW返回 S9会话建立 /修改响应。
步骤 9、 当 H-PCRF受到触发， 例如： 收到来自 AF的业务信息， 需要对 WLAN Offload连接的数据制定 PCC (包括： QoS策略和计费策略 ) 。
步骤 10、 H-PCRF将制定的 PCC策略通过之前建立的为 WLAN Offload 服务的 subsession发送给 V-PCRF。
步骤 11、 V-PCRF 收到消息后， 将 subsession 中的 PCC 策略下发给 BRAS/BNG执行。
上述流程对于 Local Break out 漫游场景也适用， 此时 P-GW在拜访地。
实施例三 UE通过 WLAN无线方式接入 EPS核心网 , HomeRouted场景下， 此时 固网不感知到 UE接入， 由于当 UE通过可信 S2c接入， UE需要向移动网络 发起认证， 认证不经过 ePDG, 经过 P-GW向移动网络的 AAA认证， AAA 认证成功后， 返回认证成功。 H-PCRF收到来自 P-GW的消息后， 向 V-PCRF 触发建立 S9会话， V-PCRF受到触发向 H-PCRF建立 S9会话，即使此时 WLAN Offload数据连接没有 APN信息， V-PCRF也需要为该 WLAN Offload建立 subsession。 一种显式方式， 消息中携带标识告知 H-PCRF该 subsession是为 WLAN Offload服务的， 或是不携带标识， 由 H-PCRF收到消息后根据消息中 的信息（例如：没有 APN信息）判断出该 subsession是服务于 WLAN Offload, H-PCRF后续通过该 subsession会话传递计费和 QoS策略信息。
如图 10所示， 本实施例流程具体描述如下：
步骤 1、 UE通过无线 WLAN方式接入移动核心网， 完成认证和获得地 址，该认证是隧道认证，即在向移动网络建立隧道时的认证，认证经过 P-GW, 如果 AAA通过 UE认证， 会向 UE返回响应。 UE获得移动网络分配的 IP地 址。
步骤 2、 UE向 P-GW发起绑定更新。
步骤 3、 P-GW向 H-PCRF发起 IP-CAN会话建立。
步骤 4、 H-PCRF向 P-GW返回 IP-CAN会话建立响应。
步骤 5、 H-PCRF触发 V-PCRF建立 S9会话。
步骤 6、 V-PCRF向 H-PCRF发起 S9会话建立。
此步骤中， V-PCRF 可以通过显式方式， 例如携带标识， 或通过分配特 殊的 subsession ID来标识该 subsession为 WLAN Offload服务；或是通过隐式 方式， 由 H-PCRF根据消息中的信息（例如： 接入类型， 没有 APN信息）来 判断。
步骤 7、 当 H-PCRF受到触发， 例如： 收到来自 AF的业务信息， 需要对
WLAN Offload连接的数据制定 PCC (包括： QoS策略和计费策略） 。
步骤 8、 H-PCRF将制定的 PCC策略通过之前建立的为 WLAN Offload 服务的 subsession发送给 V-PCRF。 步骤 9、 V-PCRF 收到消息后， 将 subsession 中的 PCC 策略下发给 BRAS/BNG执行。
对于 Local Breakout场景下， P-GW在拜访地， 此时 P-GW触发 V-PCRF 建立 S9会话。
此外， 本发明实施例中还提供了一种融合网络中策略控制系统， 该系统 包括 PCRF, 所述 PCRF中包括 UE接入感知模块和子会话建立模块， 其中： 所述 UE接入感知模块设置成获知 UE通过 WLAN接入方式接入移动网 络后， 通知所述子会话建立模块；
所述子会话建立模块设置成在建立 S9会话时， 创建为 WLAN Offload服 务的子会话， 并携带 WLAN Offload指示。
所述 PCRF还包括策略制定下发模块，
所述策略制定下发模块设置成在受到触发时， 将制定的 PCC 策略和 /或
携带所述 WLAN Offload指示， 包括：
携带 WLAN Offload标识； 携带特定的 subsession ID; 或者， 不携带 APN 信息。
所述 UE接入感知模块是设置成通过以下方式获知 UE通过 WLAN接入 方式接入移动网络：
收到认证授权计费 （ AAA )服务器发送的建立会话请求； 收到宽带接入 服务器或宽带网关发送的建立会话请求； 收到演进的 ePDG发送的网关控制 会话建立请求； 收到 P-GW的 IP-CAN会话请求； 或者， 收到所述 H-PCRF 发送的触发建立 S9会话建立请求。
以上仅为本发明的优选实施案例而已， 并不用于限制本发明， 本发明还 可有其他多种实施例， 在不背离本发明精神及其实质的情况下， 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形， 但这些相应的改变和 变形都应属于本发明所附的权利要求的保护范围。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。
工业实用性 釆用本发明，能够区分漫游场景下的 WLAN offload数据与路由回到 EPC 网络的数据， 进而为 WLAN offload数据下发策略控制。

Claims

权 利 要 求 书
1、 一种融合网络中策略控制方法， 包括，
漫游场景下， 拜访地策略和计费规则功能 (V-PCRF)获知用户设备 (UE)通 过无线局域网络 (WLAN)接入方式接入移动网络后，在向归属地策略和计费规 则功能 (H-PCRF)建立 S9 会话时， 创建为 WLAN Offload服务的子会话 (subsession) , 并携带 WLAN Offload指示。
2、 如权利要求 1所述的方法， 其中，
所述携带 WLAN Offload指示， 包括：
携带 WLAN Offload标识；
携带特定的 subsession ID; 或者，
不携带接入点名称 (APN)信息。
3、 如权利要求 1所述的方法， 还包括：
所述 H-PCRF将制定的策略和计费控制 (PCC)策略和 /或服务质量 (QoS)策 4、 如权利要求 1 所述的方法， 其中， 所述 V-PCRF通过以下方式获知
UE通过 WLAN接入方式接入移动网络：
收到认证授权计费 （AAA )服务器发送的建立会话请求；
收到宽带接入服务器或宽带网关发送的建立会话请求；
收到演进的分组数据网关 (ePDG)发送的网关控制会话建立请求； 收到分组数据网络网关 (P-GW)的 IP连接接入网 (IP-CAN)会话请求； 或 者，
收到所述 H-PCRF发送的触发建立 S9会话建立请求。
5、 如权利要求 2所述的方法， 还包括：
所述 H-PCRF在受到触发后， 将制定的 PCC策略下发给所述 V-PCRF; 其中， 所述 H-PCRF受到触发的触发条件包括： 收到应用功能（AF ) 的 业务信息后， 需要对 WLAN Offload连接的数据制定 PCC。
6、 如权利要求 4所述的方法， 其中， 所述 H-PCRF通过如下方式发送所 述触发建立 S9会话建立请求：
所述 H-PCRF收到 P-GW发送的 IP-CAN会话建立请求，获知所述 UE通 过 WLAN接入方式接入移动网络时， 则向所述 V-PCRF发送所述触发建立 S9会话建立请求。
7、 一种融合网络中策略控制系统， 包括策略和计费规则功能（PCRF ) , 所述 PCRF包括用户设备 ( UE )接入感知模块和子会话建立模块， 其中： 所述 UE接入感知模块设置成获知 UE通过无线局域网络（ WLAN )接入 方式接入移动网络后， 通知所述子会话建立模块；
所述子会话建立模块设置成在建立 S9会话时， 创建为 WLAN Offload服 务的子会话， 并携带 WLAN Offload指示。
8、如权利要求 7所述的系统，其中所述 PCRF还包括策略制定下发模块， 所述策略制定下发模块设置成在受到触发时， 将制定的策略和计费控制 ( PCC )策略和 /或服务质量（QoS )策略通过所述为 WLAN Offload服务的 子会话进行策略下发。
9、 如权利要求 7所述的系统， 其中，
携带所述 WLAN Offload指示， 包括：
携带 WLAN Offload标识；
携带特定的 subsession ID; 或者，
不携带接入点名称（APN )信息。
10、 如权利要求 7所述的系统， 其中，
所述 UE接入感知模块是设置成通过以下方式获知 UE通过 WLAN接入 方式接入移动网络：
收到认证授权计费 （AAA )服务器发送的建立会话请求；
收到宽带接入服务器或宽带网关发送的建立会话请求；
收到演进的 ePDG发送的网关控制会话建立请求；
收到 P-GW的 IP-CAN会话请求； 或者，
收到所述 H-PCRF发送的触发建立 S9会话建立请求。
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EP2790455A1 (en) 2014-10-15
US20140378131A1 (en) 2014-12-25
CN103209401A (zh) 2013-07-17
CN103209401B (zh) 2018-07-24
US9351325B2 (en) 2016-05-24

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