WO2015192568A1 - 多会话绑定方法、装置及系统 - Google Patents

多会话绑定方法、装置及系统 Download PDF

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Publication number
WO2015192568A1
WO2015192568A1 PCT/CN2014/089233 CN2014089233W WO2015192568A1 WO 2015192568 A1 WO2015192568 A1 WO 2015192568A1 CN 2014089233 W CN2014089233 W CN 2014089233W WO 2015192568 A1 WO2015192568 A1 WO 2015192568A1
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WIPO (PCT)
Prior art keywords
pcrf
session
user terminal
pgw
message
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PCT/CN2014/089233
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English (en)
French (fr)
Inventor
张学军
王慧
黄鹂
韩利辉
石英伟
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中兴通讯股份有限公司
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Publication of WO2015192568A1 publication Critical patent/WO2015192568A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/088—Load balancing or load distribution among core entities

Definitions

  • the present invention relates to the field of communications, and in particular, to a multi-session binding method, apparatus, and system.
  • LTE Long Term Evolution
  • 4G mobile communication technology
  • 20M bandwidth for a single mobile subscriber, enabling wireless broadband.
  • the fixed rate of traffic such as 70M/10 currency unit
  • services that consume a lot of bandwidth such as high-definition video on demand, etc.
  • the probability is small.
  • the high bandwidth advantage of 4G networks cannot be exploited, which wastes network resources and weakens the competitiveness of 4G networks.
  • service providers because the user's usage rate is not high enough to obtain sufficient revenue and re-investment, which affects the continuous provision of services, it is difficult for users to enjoy colorful high-bandwidth services.
  • PCC Policy Control and Charging
  • online charging and flow-based charging enable operators to use different rates for different services to encourage users to use high-bandwidth services. Enhancing the user experience is conducive to attracting potential users and competing for other network users, thereby achieving a win-win situation for mobile users/operators/service providers, and jointly expanding and strengthening the 4G market.
  • the application is the network element at the service level.
  • the interface between the Policy and Charging Rules Function (PCRF) is Rx.
  • PCEF Policy and Charging Enforcement Function
  • the policy and charging enhanced function entity is a logical network element at the session level, and the interface with the PCRF is Gx.
  • the business level and the conversation level are two separate levels. When there is only one PCRF network element in the network, the PCRF network element associates the Gx/Rx interface. For the same service of the mobile user, as shown in FIG.
  • the PCRF performs QoS policy control and cost quota control on the PCEF according to the real-time media stream change of the AF service, and the PCEF sends a real-time charging message to the OCS (Online Charging System). Fee system), online charging.
  • OCS Online Charging System
  • Fee system Fee system
  • the OCS periodically feeds back the current total remaining amount of the user to the PCRF through the Sy interface, and the PCRF performs a new quota allocation on the PCEF accordingly, and thus cycles.
  • This control model requires the same PCRF host for the same user Gx/Rx interface, which is the basic requirement of the business layer for the PCC system.
  • the PCRF controls the PCEF's fee quota and QoS (Quality of Service) allocation in real time according to the change of the VoIP (Voice over Internet Protocol) media stream.
  • each PCRF serves a different number segment.
  • IMSI International Mobile Subscriber Identity
  • MSISDN Mobile Station International ISDN Number
  • IPv4/IPv6 number segment is planned as such, it is equivalent to a single PCRF networking.
  • the service node sends a Diameter message, it sets the PCRF host name according to the number segment plan.
  • This method mainly has the following drawbacks: due to the roaming characteristics of mobile users, all networks supporting roaming need to maintain IMSI/MSISDN/IPv4/IPv6 segment data, and the data maintenance workload of multiple roaming networks is higher than that of the network.
  • IMSI/MSISDN/IPv4/IPv6 segment planning will result in waste of resources and shortage. Therefore, when the IMSI/MSISDN/IPv4/IPv6 segment needs to be extended or changed, many network elements of all other roaming networks are involved; when the PCRF node is extended or changed, many network elements of all roaming networks are affected; IMSI/MSISDN/IPv4 The static planning of the /IPv6 segment causes waste and shortage of these resources; it is difficult to support dynamic load sharing between PCRF nodes, which is not conducive to improving the service availability of the entire PCRF domain.
  • the 3GPP 29.213 protocol specifically introduces the DRA proxy network element, and provides two technologies to solve this problem, namely, proxy DRA (Proxy DRA) mode and redirected DRA (Redirect DRA) mode, and its implementation principle See Figure 2 and Figure 3.
  • proxy DRA Proxy DRA
  • Redirect DRA redirected DRA
  • Figure 2 and Figure 3 the DRA binds and forwards signaling to Diameter sessions of different interfaces of the same user. When configured in pairs, the DRA needs to synchronize the binding information to the partner DRA in real time.
  • the DRA binds the Diameter session of the different interfaces of the same user and returns the bound PCRF host name to the calling node through the 'Redirect-Host' AVP.
  • the DRA proxy network element needs to be specifically added, which makes the PCC architecture more complicated; the DRA needs to maintain user-based binding data, or based on APN (Access Point Name). Binding data.
  • DRAs are configured in pairs, dynamic binding data synchronization needs to be performed between the DRAs, or data sharing is implemented by other technologies.
  • a dedicated DRA proxy network element needs to be configured; when the DRA network elements are deployed in pairs, the DRA needs to dynamically synchronize data synchronization, or implement data sharing through other technologies.
  • the implementation is very complicated; when the DRA network elements are deployed in pairs, the compatibility between the DRA devices of the heterogeneous vendors is problematic; the DRA network elements become an added negative factor affecting the services, thereby reducing the reliability of the entire system service.
  • the present invention provides a multi-session binding method, apparatus, and system to solve at least the above problems in the related art in which a plurality of PCRFs are shared.
  • a multi-session binding method comprising: receiving, by a user terminal, a packet data network gateway PGW when assigning a first IP connection access network IP-CAN session for establishing a Gx interface for the user terminal
  • the information about the policy and the charging rule function entity PCRF the user terminal sends an invitation message to the application server AF, where the invitation message carries related information of the PCRF, indicating that the AF is in the user
  • the PCRF is set as the destination host of the authentication application message.
  • the method further includes: the user terminal determines that a second IP-CAN session needs to be established; and the user terminal passes the information about the PCRF.
  • the PGW sent by the network instructs the PGW to set the PCRF as a destination host for creating a control request CCR message when establishing the second IP-CAN session.
  • the method further includes: determining, by the user terminal, the second IP-CAN session and the first IP - The access point APN used by the CAN session is the same.
  • the PGW that the user terminal sends the related information of the PCRF to the network includes: the user terminal sends a packet data network PDN connection request message, where the PDN connection request message carries the Information about the PCRF; the mobility management entity receives the PDN connection request message, and sends a create session request message, where the create session request message carries related information of the PCRF; the service gateway SGW sends the create session request message Forwarded to the PGW.
  • the user terminal receives information about the PCRF allocated by the packet data network gateway PGW when establishing the IP connection access network IP-CAN session of the Gx interface for the user terminal, including: the packet data network gateway PGW receives the creation session. a request message, when establishing the first IP-CAN session of the Gx interface, according to an operator policy, Acquiring the PCRF bound to the first IP-CAN session; the PGW carries the information about the PCRF in a create session response message, and sends the information to the serving gateway, where the service gateway forwards the message to the User terminal.
  • the related information of the PCRF includes: a host name of the PCRF.
  • the related information of the PCRF further includes: a method for binding a session to a PCRF, where the method of binding the session to the PCRF includes: based on APN binding or based on user binding.
  • a multi-session binding apparatus comprising: a receiving module configured to receive a first IP connection access network IP-CAN session of a packet data network gateway PGW for establishing a Gx interface for a user terminal
  • the information about the time-shared policy and the charging rule function entity PCRF is configured to send an invitation message to the application server AF, where the invitation message carries related information of the PCRF, indicating the AF
  • the PCRF is set as the destination host of the authentication application message.
  • the device further includes: a first determining module, configured to determine that a second IP-CAN session needs to be established; and a second sending module, configured to send related information of the PCRF to the PGW through a network, indicating When the PGW establishes the second IP-CAN session, the PCRF is set to create a destination host that controls the request CCR message.
  • a first determining module configured to determine that a second IP-CAN session needs to be established
  • a second sending module configured to send related information of the PCRF to the PGW through a network, indicating When the PGW establishes the second IP-CAN session, the PCRF is set to create a destination host that controls the request CCR message.
  • the apparatus further includes: a second determining module, configured to determine that the second IP-CAN session is the same as an access point APN used by the first IP-CAN session, triggering the second sending module .
  • a second determining module configured to determine that the second IP-CAN session is the same as an access point APN used by the first IP-CAN session, triggering the second sending module .
  • a method for transmitting a policy and charging rule function entity PCRF information including: a first data connection access network IP-CAN in which a packet data network gateway PGW establishes a Gx interface for a user terminal. During the session, the PCRF is allocated for the first IP-CAN session; the PGW sends the related information of the PCRF to the user terminal through the network.
  • the method further includes: the PGW receiving a request for creating a second IP-CAN session for the user terminal, where the request carries related information of the PCRF; the PGW will allocate The PCRF of the first IP-CAN session is assigned to the second IP-CAN session.
  • the related information of the PCRF includes: a host name of the PCRF.
  • the related information of the PCRF further includes: a method for binding a session to a PCRF, where the method of binding the session to the PCRF includes: based on APN binding or based on user binding.
  • a device for transmitting PCRF information of a policy and charging rule function entity comprising: an allocating module, configured to establish a first IP connection access network IP-CAN session for a Gx interface of a user terminal. And transmitting, by the first IP-CAN session, a PCRF; the sending module is configured to send, by using a network, related information of the PCRF to the user terminal.
  • the method further includes: a receiving module, configured to receive a request for creating a second IP-CAN session for the user terminal, where the request carries related information of the PCRF; the allocation module is further configured to The PCRF assigned to the first IP-CAN session is assigned to the second IP-CAN session.
  • a session establishment method including: an application server AF receiving an invitation message sent by a user terminal, where the invitation message carries related information of the PCRF;
  • the PCRF is set as the destination host of the authentication application message.
  • a session establishing apparatus including: a receiving module, configured to receive an invitation message sent by a user terminal, where the invitation message carries related information of the PCRF; and a setting module, When the Rx interface session is established for the user terminal, the PCRF is set as the destination host of the authentication application message.
  • a multi-session binding system including: a user terminal, a packet data network gateway PGW, and an application server AF, wherein the PGW includes the PCRF information transmitting apparatus described above; The multi-session binding device described above is included; the AF includes the session establishment device described above.
  • the PCRF host information allocated by the Gx session is transmitted to the mobile terminal, and then forwarded by the mobile terminal. After the AF is received, it is set as the destination host name of the Diameter message in the Rx session, thereby implementing concurrently the same user.
  • Multiple Gx/Rx sessions are routed to the same PCRF host, which overcomes the above shortcomings of "data planning mode” and "DRA proxy mode".
  • the implementation is simple and efficient, greatly simplifying maintenance and improving system reliability. .
  • FIG. 1 is a schematic diagram of a real-time charging closed-loop control model of a PCC architecture according to the related art
  • FIG. 2 is a schematic diagram of a DRA networking model of a Proxy proxy mode of 3GPP according to the related art
  • FIG. 3 is a schematic diagram of a DRA networking model of a 3GPP Redirect proxy mode according to the related art
  • FIG. 4 is a schematic structural diagram of a multi-session binding system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a multi-session binding apparatus according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a device for transmitting PCRF information according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a session establishing apparatus according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a multi-session binding method according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a method for transmitting PCRF information according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of a session establishment method according to an embodiment of the present invention.
  • FIG. 11 is a signaling flowchart of multi-session binding according to Embodiment 1 of the present invention.
  • FIG. 12 is a signaling flowchart of multi-session binding according to Embodiment 2 of the present invention.
  • a multi-session binding system is provided.
  • the system mainly includes: a user terminal 40, a Packet Data Network Gateway (PGW) 42 and an application server (AF) 44.
  • PGW 42 is configured as a Policy and Charging Rules Function (PCRF) for the first IP connection access network (IP-CAN) session allocated by the user terminal 40 to establish a Gx interface.
  • PCRF Policy and Charging Rules Function
  • the user terminal 40 is configured to receive information about the PCRF sent by the PGW 42 and send the information to the AF 42 An invitation message for the information related to the PCRF; the AF 42 is configured to set the PCRF as the destination host of the authentication application message when establishing the Rx interface session for the user terminal 40.
  • the user terminal 40 may send a PDN connection request message to the mobility management entity (for example, the MME).
  • the MME sends a Create Session Request message to the SGW, and the SGW receives the message.
  • the PGW 42 allocates and binds a policy according to the IMSI/APN of the user and the PCRF of the operator.
  • the PGW 42 randomly selects a PCRF according to the load sharing policy, and then sends a CCR_I (CCR Initial, The CCR initial message) message establishes a Gx session, and the Dest-Realm of the message can be the domain name of the PCRF. Then, the PGW 42 sends a Create Session Response message to the SGW, and sets and carries the related information of the PCRF. After receiving the message, the SGW sends a Create Session Response message to the MME to carry the PCRF.
  • CCR_I CCR Initial, The CCR initial message
  • the MME After receiving the message, the MME sends a PDN CONNECTIVITY ACCEPT message, which is actually an activation bearer request message, carries the information about the PCRF, and the user terminal 40 assembles the SIP signaling according to the received PCRF information. INVITE message. Then, the user terminal 40 sends an INVITE message to the AF 44, and the PCRF host name can be carried by adding a private header field P-PCRF-Host-Name. The AF 44 receives the INVITE message, establishes an Rx interface session, and sends an AAR message. The Dest-Host of the message is set to the PCRF host name carried by the INVITE, and is routed according to the destination host, and the message is sent to the same PCRF, thereby implementing Gx. PCRF binding of the /Rx session.
  • the user terminal 40 is further configured to send related information of the PRCF to the PGW 42 over the network when it is determined that the second IP-CAN session needs to be established.
  • the PGW 42 is further configured to set the PCRF to a destination host that creates a control request CCR message when establishing the second IP-CAN session.
  • the same user's Gx interface session is bound to the same PCRF.
  • the user terminal 40 is further configured to determine that the second IP-CAN session is the same as the first IP-CAN session before the related information of the PRCF is sent to the PGW 42 through the network.
  • Access Point APN
  • the Gx interface session that the user accesses using the same access point can be bound to the same PCRF.
  • the PGW transmits the PCRF host information allocated by the Gx session to the mobile terminal, and then forwards it through the mobile terminal, and the AF or PGW (PDN-Gateway, PDN gateway) After receiving, it is set to the destination host name of the Diameter message in the Rx/Gx session, so that multiple Gx/Rx sessions concurrently with the same user are routed to the same PCRF host.
  • the AF or PGW PDN-Gateway, PDN gateway
  • the information can be transparently transmitted through the PCO (Protocol Configuration Options) parameter.
  • the PCRF information to be bound is transparently transmitted from the PGW to the mobile terminal by using the extended PCO, so as to implement binding of the Gx/Rx session or binding of the Gx/Gx session.
  • the related information of the PCRF may be transmitted by expanding the message of the existing signaling.
  • the PDN CONNECTIVITY REQUEST message may be extended according to Table 1, and the "PCRF-Info" information is added to the existing PCO information element.
  • the Activate dedicated EPS bearer context request/PDN connection accept message may be extended according to Table 2, as shown in Table 2, adding "PCRF-Info" information to the already existing PCO information element.
  • the Create Session Request message can be extended according to Table 3. As shown in Table 3, the "PCRF-Info" parameter is added to the existing PCO information element.
  • the Create Session Response message can be extended according to Table 4. As shown in Table 4, the "PCRF-Info" parameter is added to the existing PCO information element.
  • the PCO information element can be extended according to Table 5. As shown in Table 5, 0012H (ie, information about the PCRF) is extended in the additional parameter list (octets w+1to z).
  • the mobile terminal is in the network direction (MS to network direction):
  • Table 6 shows the definition of the RCRF-Info information element in an alternative embodiment of the invention.
  • the PCRF-Info information mainly includes: a PCRF host name and a PCRF binding method, where N is a maximum of 128.
  • the INVITE message of the SIP signaling may be extended, and the private header field P-PCRF-Host-Name is added, and the definition is as follows:
  • Hostname can be found in RFC 3261.
  • the PCEF (actually a PGW network element) receives a Create Session Request message of the SGW (Serving Gateway), and establishes an IP-CAN (IP-Connectivity) of the Gx interface.
  • IP IP-Connectivity
  • the PCRF host name is obtained according to the carrier policy.
  • the binding method can be based on the APN or based on the user.
  • the PCEF sends a Create Session Response message to the SGW.
  • the SGW forwards the Create Session Response message to the MME (Mobility Management Entity); the MME sends the PDN CONNECTIVITY ACCEPT In fact, the activation bearer request message is forwarded to the user terminal, carrying the PCRF information.
  • MME Mobility Management Entity
  • the PCRF host name assigned by the Gx interface is sent to the AF.
  • the AF receives the INVITE message, the Rx session is established, and the carried PCRF host name is set to AAR. (Authenticate application request)
  • the destination host name (Dest-Host) of the message is set to implement Gx/Rx multi-session binding.
  • the PDN CONNECTIVITY REQUEST message carries the PCRF information and is forwarded to the PGW by creating a Session Request message (Create Session Request).
  • the PCRF host name is set to the destination host name (Dest-Host) of the CCR (Credit Control Request) message, and the PGW is routed to the PCRF according to the destination host name to implement Gx/Gx multi-session. Bind.
  • Gx/Rx multi-session binding is realized, which overcomes many shortcomings of "data planning mode” and “DRA proxy mode", and the implementation manner is simple and efficient, which greatly simplifies maintenance work and improves The reliability of the system.
  • a multi-session binding device is further provided, and the device may be disposed in the user terminal 40.
  • FIG. 5 is a schematic structural diagram of a multi-session binding apparatus according to an embodiment of the present invention.
  • the apparatus mainly includes: a receiving module 410 configured to receive a packet data network gateway (PGW) to establish a Gx interface for a user terminal.
  • PGW packet data network gateway
  • IP-CAN IP connection access network
  • PCRF policy and charging rule function entity
  • the first sending module 420 is configured to send an invitation message to the application server (AF), wherein
  • the invitation message carries related information of the PCRF, and indicates that the AF is set as the destination host of the authentication application message when establishing an Rx interface session for the user terminal.
  • the device may further include: a first determining module, configured to determine that a second IP-CAN session needs to be established; and a second sending module, configured to send related information of the PCRF to the PGW through a network, Instructing the PGW to set the PCRF as a destination host for creating a Control Request (CCR) message when establishing the second IP-CAN session.
  • a first determining module configured to determine that a second IP-CAN session needs to be established
  • a second sending module configured to send related information of the PCRF to the PGW through a network, Instructing the PGW to set the PCRF as a destination host for creating a Control Request (CCR) message when establishing the second IP-CAN session.
  • CCR Control Request
  • the second sending module may send the related information of the PCRF to the MME in the PDN connection request message, and after receiving the message, the MME sends a session creation request message to the SGW, where the message carries the PCRF.
  • the SGW forwards the create request message to the PGW.
  • the apparatus may further include: a second determining module, configured to determine that the second IP-CAN session is the same as the access point APN used by the first IP-CAN session, triggering the second sending Module.
  • a second determining module configured to determine that the second IP-CAN session is the same as the access point APN used by the first IP-CAN session, triggering the second sending Module.
  • a device for transmitting PCRF information is further provided, and the device may be disposed in the PGW.
  • FIG. 6 is a schematic structural diagram of a device for transmitting PCRF information according to an embodiment of the present invention.
  • the device mainly includes: an allocating module 62, configured to establish a first IP connection access network for a Gx interface for a user terminal.
  • the PCRF is allocated for the first IP-CAN session;
  • the sending module 64 is configured to send the related information of the PCRF to the user terminal through the network.
  • the apparatus may further include: a receiving module 66, configured to receive a request for creating a second IP-CAN session for the user terminal, where the request carries the PCRF Related Information;
  • the allocation module is further configured to assign the PCRF assigned to the first IP-CAN session to the second IP-CAN session.
  • a session establishing apparatus which may be disposed in the AF described above.
  • FIG. 7 is a schematic structural diagram of a session establishing apparatus according to an embodiment of the present invention.
  • the apparatus mainly includes: a receiving module 72, configured to receive an invitation message sent by a user terminal, where the invitation message carries The information about the PCRF; the setting module 74 is configured to set the PCRF as a destination host of the authentication application message when establishing an Rx interface session for the user terminal.
  • a multi-session binding method is also provided, which can be completed by the above device or system.
  • FIG. 8 is a flowchart of a multi-session binding method according to an embodiment of the present invention. As shown in FIG. 8, the method mainly includes the following steps:
  • Step S802 the user terminal receives information about a PCRF allocated by a packet data network gateway (PGW) when establishing a first IP connection access network (IP-CAN) session of the Gx interface for the user terminal;
  • PGW packet data network gateway
  • IP-CAN IP connection access network
  • Step S804 the user terminal sends an invitation message to the application server AF, where the invitation message carries related information of the PCRF, and indicates that the AF is to establish an Rx interface session for the user terminal,
  • the PCRF is set to the destination host that authenticates the application message.
  • the method further includes: the user terminal determines that a second IP-CAN session needs to be established; and the user terminal passes the information about the PCRF.
  • the PGW sent by the network instructs the PGW to set the PCRF as a destination host for creating a control request CCR message when establishing the second IP-CAN session.
  • a Gx session of the same user can be bound to the same PCRF.
  • the method may further include: determining, by the user terminal, the second IP-CAN session and the first The access point (APN) used by the IP-CAN session is the same.
  • the Gx session accessed by the user through the same access point is bound to the same PCRF.
  • the PGW that the user terminal sends the related information of the PCRF to the network may include: the user terminal sends a packet data network PDN connection request message, where the PDN connection request message carries Information about the PCRF; the mobility management entity receives the PDN connection request message, Sending a create session request message, where the create session request message carries related information of the PCRF; the serving gateway SGW forwards the create session request message to the PGW.
  • the user terminal receives information about the PCRF allocated by the packet data network gateway PGW when establishing the IP connection access network IP-CAN session of the Gx interface for the user terminal, including: the packet data network gateway PGW receives the creation session. a request message, when the first IP-CAN session of the Gx interface is established, acquiring the PCRF bound to the first IP-CAN session according to an operator policy; the PGW carrying the information related to the PCRF And sent to the serving gateway in the create session response message, and the service gateway forwards to the user terminal by using the mobility management entity.
  • the related information of the PCRF may include: a host name of the PCRF.
  • the related information of the PCRF may further include: a method for binding a session to a PCRF, where the method of binding the session to the PCRF includes: based on APN binding or based on user binding.
  • a method for transmitting Policy and Charging Rules Function Entity (PCRF) information is also provided, and the method may be implemented by the foregoing apparatus or system.
  • PCRF Policy and Charging Rules Function Entity
  • FIG. 9 is a flowchart of a method for transmitting PCRF information according to an embodiment of the present invention. As shown in FIG. 9, the method mainly includes the following steps:
  • Step S902 the PGW allocates a PCRF to the first IP-CAN session when establishing a first IP connection access network (IP-CAN) session of the Gx interface for the user terminal;
  • IP-CAN IP connection access network
  • Step S904 the PGW sends related information of the PCRF to the user terminal through a network.
  • the method may further include: the PGW receiving a request for creating a second IP-CAN session for the user terminal, where the request carries related information of the PCRF; the PGW will The PCRF assigned to the first IP-CAN session is assigned to the second IP-CAN session. Thereby multiple Gx interface sessions can be bound to the same PCRF.
  • the related information of the PCRF includes: a host name of the PCRF.
  • the related information of the PCRF further includes: a method for binding a session to a PCRF, where the method of binding the session to the PCRF includes: based on APN binding or based on user binding.
  • a session establishment method is further provided, which may be implemented by the foregoing apparatus or system.
  • FIG. 10 is a flowchart of a session establishment method according to an embodiment of the present invention. As shown in FIG. 10, the method mainly includes the following steps:
  • Step S1002 The AF receives an invitation message sent by the user terminal, where the invitation message carries related information of the PCRF.
  • Step S1004 When establishing an Rx interface session for the user terminal, the AF sets the PCRF as a destination host of an authentication application message.
  • the session binding of the Gx/Rx interface is taken as an example for description.
  • FIG. 11 is a signaling flowchart of a session binding of a Gx/Rx interface in the embodiment. As shown in FIG. 11, the method mainly includes the following steps:
  • Step S1101 The user initiates a VoIP service, and the terminal sends a PDN CONNECTIVITY request message to the MME, and carries the IMSI number and the APN information.
  • Step S1102 After receiving the message, the MME sends a Create Session Request message to the SGW.
  • Step S1103 After receiving the message, the SGW sends a Create Session Request message to the PGW.
  • Step S1104 After receiving the message, the PGW, according to the IMSI/APN of the user and the PCRF allocation and binding policy of the operator, assumes that the CCR_I (CCR Initial) message is used to establish a Gx session by using a load sharing policy.
  • CCR_I CCR Initial
  • the Dest-Realm of the message is the domain name of the PCRF and does not carry the destination host name.
  • the PGW randomly selects a PCRF according to the load sharing strategy.
  • Step S1105 After receiving the CCR (Initial) request message, the PCRF returns a CCA (Credit Control Answer) response message, and the source host name is the host name of the PCRF.
  • the PGW extracts and records the PCRF host name of this session.
  • Step S1106 The PGW sends a Create Session Response message to the SGW, and sets and carries the PCRF information (PCRF host name, binding method [is based on APN-based binding or user-based binding]);
  • Step S1107 After receiving the message, the SGW sends a Create Session Response message to the MME, and carries the PCRF information (PCRF host name, binding method);
  • Step S1108 After receiving the message, the MME sends a PDN CONNECTIVITY ACCEPT message, which is actually an activation bearer request message, and carries PCRF information (PCRF host name, binding method);
  • Step S1109 The terminal assembles an INVITE message of SIP signaling according to the received PCRF information.
  • Step S1110 The terminal sends an INVITE message to the AF, and carries the PCRF host name by adding a private header field P-PCRF-Host-Name.
  • Step S1111 The AF receives the INVITE message, establishes an Rx interface session, and sends an AAR message.
  • the Dest-Host of the message is set to the PCRF host name carried by the INVITE, and the route is sent according to the destination host, and the message is sent to the same PCRF. PCRF binding for Gx/Rx sessions.
  • Step S1112 The AF receives the AAA (Auth Application Answer) message, and the service process continues.
  • AAA Auth Application Answer
  • a new PDN connection is established by the same APN, and a session of multiple Gx interfaces is bound to the same PCRF as an example for description.
  • FIG. 12 is a signaling flowchart of multi-session binding in the embodiment. As shown in FIG. 12, the method mainly includes the following steps:
  • Step S1201 - S1208 Step S1101 - Step S1108 of the first embodiment
  • Step S809 The user establishes a new PDN connection, and the terminal determines that the PDN connection has been established, and the APN is the same, and the PDN connection request message is set by using the recorded PCRF information.
  • Step S1210 The terminal sends a PDN CONNECTIVITY request message to the MME, and carries the IMSI number, the APN information, and the PCRF information.
  • Step S1211 After receiving the message, the MME sends a Create Session Request message to the SGW.
  • Step S1212 After receiving the message, the SGW sends a Create Session Request message to the PGW.
  • Step S1213 After receiving the message, the PGW sends a CCR_I message, sets the PCRF host name carried in the creation session request message to the destination host name of the CCR_I, and performs routing according to the destination host, and sends the message to the same PCRF to implement Gx. PCRF binding of the /Gx interface.
  • the present invention achieves the following technical effects: the PCRF host information allocated by the Gx session is transmitted to the mobile terminal, and then forwarded by the mobile terminal, and after the AF is received, it is set as the Rx session.
  • the destination host name of the Diameter message so that multiple Gx/Rx sessions concurrently with the same user are routed to the same PCRF host, which overcomes the above shortcomings of "data planning mode” and "DRA proxy mode", and the implementation is simple. Efficient, greatly simplifies maintenance and improves system reliability.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network 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 thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the multi-session binding method, apparatus, and system provided by the embodiments of the present invention have the following beneficial effects: the PCRF host information allocated by the Gx session is transmitted to the mobile terminal, and then forwarded through the mobile terminal, after the AF is received. It is set to the destination host name of the Diameter message in the Rx session, so that multiple Gx/Rx sessions concurrently with the same user are routed to the same PCRF host.
  • the implementation is simple and efficient, which greatly simplifies the maintenance work. Improve the reliability of the system.

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Abstract

本发明公开了一种多会话绑定方法、装置及系统。其中，该方法包括：用户终端接收PGW在为该用户终端建立Gx接口的第一IP-CAN会话时分配的PCRF的相关信息；该用户终端向AF发送邀请消息，其中，该邀请消息中携带有该PCRF的相关信息，指示该AF在为该用户终端建立Rx接口会话时，将该PCRF设置为鉴权应用消息的目的主机。

Description

多会话绑定方法、装置及系统 技术领域
本发明涉及通信领域，具体而言，涉及一种多会话绑定方法、装置及系统。
背景技术
长期演进(LTE)(即第四代移动通信技术(4G))可为单个移动用户提供20M的带宽，实现了无线宽带化。在LTE中，如果继续沿用流量的固定费率(比如说70M/10货币单元)，由于需要耗费大量的带宽，因此，需要消耗很大带宽的业务(比如说高清视频点播等等)被用户使用的概率较小。对运营商来说，则无法发挥4G网络的高带宽优势，从而浪费了网络资源，削弱了4G网络的竞争力。对业务提供商来说，由于用户的使用率不高，无法获得足够的收入和再投入，进而影响了业务的持续提供，用户也难以畅享多姿多彩的高带宽业务。
在PCC(Policy Control and Charging，策略控制和计费)架构中，通过在线计费和基于流的计费，使得运营商可以针对不同的业务使用不同的费率，以鼓励用户使用高带宽业务，提升用户体验，有利于吸引潜在用户、争夺他网用户，从而实现移动用户/运营商/业务提供商的三赢局面，共同做大做强4G市场。
对于典型的VoIP业务，AF(Application Function，应用服务器)是业务层面的网元，与PCRF(Policy and Charging Rules Function，策略与计费规则功能实体)的接口是Rx；PCEF(Policy and Charging Enforcement Function，策略与计费增强功能实体)是会话层面的逻辑网元，与PCRF的接口是Gx。业务层面和会话层面是二个独立的层面。当网络中只有一个PCRF网元时，PCRF网元将Gx/Rx接口关联起来。对于移动用户的同一个业务，如图1所示，PCRF根据AF业务的实时媒体流变化，对PCEF进行QoS策略控制和费用额度控制，PCEF发送实时计费消息倒OCS(Online Charging System，在线计费系统)，进行在线计费。OCS通过Sy接口向PCRF定时反馈用户当前总的剩余额度，PCRF依此对PCEF进行新的额度分配，如此循环。这个控制模型要求同一用户Gx/Rx接口的PCRF主机相同，这是业务层面对PCC系统的基本要求。PCRF根据VoIP(Voice over Internet Protocol，网络电话)媒体流的变化实时控制PCEF的费用额度和QoS(Quality of Service，服务质量)分配。
当4G用户量增长时，单个PCRF的处理容量不足以承担整个网络的业务需求，运营商势必配置多个PCRF进行负荷分担，对于同一个用户业务的Rx/Gx接口会话依旧要求通过同一个PCRF进行控制，称之为多会话绑定。
为了在多PCRF组网时支持多会话绑定，相关技术中主要有两类方法，即运营商的“数据规划方法”和3GPP的“DRA(Diameter Routing Agent，直径路由代理)代理方法”。
运营商的“数据规划方法”中，对于多个PCRF，每个PCRF服务不同的号段。当IMSI(International Mobile Subscriber Identity，国际移动用户识别)/MSISDN(Mobile Station international ISDN number，移动台国际ISDN号码)/IPv4/IPv6的号段都如此规划后，相当于单PCRF组网。业务节点在发送Diameter消息时，按照号段规划设置PCRF主机名。这种方法主要存在如下缺陷：由于移动用户的漫游特性，所有支持漫游的网络都需要维护IMSI/MSISDN/IPv4/IPv6的号段数据，多个漫游网络加起来的数据维护工作量比本网络的还要大；另外，IMSI/MSISDN/IPv4/IPv6的号段规划将造成资源的浪费和紧缺。从而导致需要扩展或者变更IMSI/MSISDN/IPv4/IPv6号段时，会涉及其他所有漫游网络的诸多网元；扩展或者变更PCRF节点时，波及其他所有漫游网络的诸多网元；IMSI/MSISDN/IPv4/IPv6号段的静态规划造成这些资源的浪费和紧缺；PCRF节点之间难以支持动态负荷分担，不利于提高整个PCRF域的业务可用性。
3GPP的“DRA代理方法”：3GPP29.213协议专门引入DRA代理网元，提供了两种技术解决了此问题，即代理DRA(Proxy DRA)方式和重定向DRA(Redirect DRA)方式，其实现原理参见图2和图3。在图2所示的组网模型中，DRA将同一个用户的不同接口的Diameter会话进行绑定并转发信令。成对配置时，DRA需要将绑定信息实时同步到伙伴DRA。在图3所示的组网模型中，DRA将同一个用户的不同接口的Diameter会话进行绑定并通过‘Redirect-Host’AVP将绑定的PCRF主机名返回给调用的节点，调用节点依此将消息路由到该PCRF主机。成对配置时，DRA需要将绑定信息实时同步到伙伴DRA。由此可见，采用这种方式，商用的DRA节点通常需要成对配置，通过负荷分担或者主备方式提高可靠性。但3GPP的“DRA代理方法”具有如下缺陷：需要专门增加DRA代理网元，使得PCC架构更加复杂化；DRA需要维护基于用户的绑定数据，或者基于APN(Access Point Name，接入点名称)的绑定数据。当DRA成对配置时，DRA之间需要进行动态绑定数据同步，或者通过其他技术实现数据共享。从而导致：在多PCRF组网时，须配置专门的DRA代理网元；DRA网元成对部署时，DRA之间需要进行动态绑定数据同步，或者通过其他技术实现数据共享， 实现都很复杂；DRA网元成对部署时，异种厂家DRA设备之间的兼容性存在问题；DRA网元成为影响业务的一个新增负面因素，从而降低了整个系统业务的可靠性。
针对相关技术中配置多个PCRF分担负荷而导致上面的问题，目前尚未提出有效的解决方案。
发明内容
相关技术中配置多个PCRF分担负荷而出现的上述的问题，本发明提供了一种多会话绑定方法、装置及系统，以至少解决相关技术中配置多个PCRF分担负荷而出现的上述问题。
根据本发明的一个方面，提供了一种多会话绑定方法，包括：用户终端接收分组数据网网关PGW在为所述用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时分配的策略与计费规则功能实体PCRF的相关信息；所述用户终端向应用服务器AF发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
可选地，在所述用户终端接收所述PCRF的相关信息之后，所述方法还包括：所述用户终端确定需要建立第二IP-CAN会话；所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。
可选地，在所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW之前，所述方法还包括：所述用户终端确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点APN相同。
可选地，所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW包括：所述用户终端发送分组数据网PDN连接请求消息，其中，所述PDN连接请求消息中携带有所述PCRF的相关信息；移动管理实体接收到所述PDN连接请求消息，发送创建会话请求消息，其中，所述创建会话请求消息中携带所述PCRF的相关信息；服务网关SGW将所述创建会话请求消息转发给所述PGW。
可选地，用户终端接收分组数据网网关PGW在为所述用户终端建立Gx接口的IP连接接入网IP-CAN会话时分配的PCRF的相关信息，包括：分组数据网网关PGW接收到创建会话请求消息，在建立Gx接口的所述第一IP-CAN会话时，根据运营商策略， 获取所述第一IP-CAN会话绑定的所述PCRF；所述PGW将所述PCRF的相关信息携带在创建会话响应消息中发送给服务网关，由所述服务网关通过移动管理实体转发给所述用户终端。
可选地，所述PCRF的相关信息包括：所述PCRF的主机名。
可选地，所述PCRF的相关信息还包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
根据本发明的另一个方面，提供了一种多会话绑定装置，包括：接收模块，设置为接收分组数据网网关PGW在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时分配的策略与计费规则功能实体PCRF的相关信息；第一发送模块，设置为向应用服务器AF发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
可选地，所述装置还包括：第一确定模块，设置为确定需要建立第二IP-CAN会话；第二发送模块，设置为将所述PCRF的相关信息通过网络发送给所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。
可选地，所述装置还包括：第二确定模块，设置为确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点APN相同，触发所述第二发送模块。
根据本发明的又一个方面，提供了一种策略与计费规则功能实体PCRF信息的发送方法，包括：分组数据网网关PGW在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时，为所述第一IP-CAN会话分配PCRF；所述PGW通过网络，将所述PCRF的相关信息发送给所述用户终端。
可选地，所述方法还包括：所述PGW接收到为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息；所述PGW将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。
可选地，所述PCRF的相关信息包括：所述PCRF的主机名。
可选地，所述PCRF的相关信息还包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
根据本发明的又一个方面，提供一种策略与计费规则功能实体PCRF信息的发送装置，包括：分配模块，设置为在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时，为所述第一IP-CAN会话分配PCRF；发送模块，设置为通过网络，将所述PCRF的相关信息发送给所述用户终端。
可选地，还包括：接收模块，设置为接收为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息；所述分配模块还设置为将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。
根据本发明的又一个方面，提供了一种会话建立方法，包括：应用服务器AF接收用户终端发送的邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息；所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
根据本发明的又一个方面，提供了一种会话建立装置，包括：接收模块，设置为接收用户终端发送的邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息；设置模块，设置为在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
根据本发明的又一个方面，提供了一种多会话绑定系统，包括：用户终端、分组数据网网关PGW和应用服务器AF，其中，所述PGW包括上述的PCRF信息发送装置；所述用户终端包括上述的多会话绑定装置；所述AF包括上述的会话建立装置。
通过本发明，将Gx会话分配的PCRF主机信息传递到移动终端，再通过移动终端转发出去，AF接收到后，将其设置为Rx会话中Diameter消息的目的主机名，从而实现将同一个用户并发的多个Gx/Rx会话路由到相同的PCRF主机上，克服了“数据规划方式”和“DRA代理方式”的上述缺点，实现方式简洁、高效，大大简化了维护工作，提高了系统的可靠性。
附图说明
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是根据相关技术的PCC架构的实时计费闭环控制模型示意图；
图2是根据相关技术的3GPP的Proxy代理方式的DRA组网模型示意图；
图3是根据相关技术的3GPP的Redirect代理方式的DRA组网模型示意图；
图4是根据本发明实施例的多会话绑定系统的结构示意图；
图5是根据本发明实施例的多会话绑定装置的结构示意图；
图6是根据本发明实施例的PCRF信息的发送装置的结构示意图；
图7是根据本发明实施例的会话建立装置的结构示意图；
图8是根据本发明实施例的多会话绑定方法的流程图；
图9是根据本发明实施例的PCRF信息的发送方法的流程图；
图10是根据本发明实施例的会话建立方法的流程图；
图11是根据本发明实施例一的多会话绑定的信令流程图；
图12是根据本发明实施例二的多会话绑定的信令流程图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。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组合。
根据本发明实施例，提供了一种多会话绑定系统。
图4为根据本发明实施例的多会话绑定系统的结构示意图，如图4所示，该系统主要包括：用户终端40、分组数据网网关(Packet Data Network Gateway，PGW)42和应用服务器(AF)44。其中，所述PGW 42设置为为所述用户终端40建立Gx接口的第一IP连接接入网(IP-CAN)会话分配的策略与计费规则功能实体(Policy and Charging Rules Function，PCRF)，并将所述PCRF的相关信息通过网络发送给所述用户终端40；所述用户终端40，设置为接收所述PGW 42发送的所述PCRF的相关信息，并向所述AF 42发送携带所述PCRF的相关信息的邀请消息；所述AF 42，设置为在为所述用户终端40建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
例如，用户终端40可以在发起VoIP业务时，发送PDN连接请求消息到移动管理实体(例如，MME)，MME接收到该消息后，发送创建会话请求消息(Create Session Request)到SGW，SGW接收到该消息后，发送创建会话请求消息(Create Session  Request)到PGW 42。PGW 42接收到该消息后，根据用户的IMSI/APN和运营商的PCRF分配和绑定策略，例如，采用负荷分担策略，PGW 42按照负荷分担策略随机选择一个PCRF，然后发送CCR_I(CCR Initial，CCR初始消息)消息建立Gx会话，消息的Dest-Realm可以为PCRF的域名。然后，PGW 42发送创建会话响应消息(Create Session Response)信息到SGW，设置并携带上述PCRF的相关信息，SGW接收到该消息后，发送创建会话响应消息(Create Session Response)信息到MME，携带PCRF的相关信息，MME接收到该消息后，发送PDN连接接受消息(PDN CONNECTIVITY ACCEPT，实际上是激活承载请求消息)消息，携带PCRF的相关信息，用户终端40根据接收到PCRF信息，组装SIP信令的INVITE消息。然后，用户终端40发送INVITE消息到AF 44，可以通过新增私有头域P-PCRF-Host-Name携带PCRF主机名。AF 44接收到INVITE消息，进行Rx接口会话建立，发送AAR消息，消息的Dest-Host设置为INVITE携带的PCRF主机名，并根据目的主机进行路由，将消息发送到相同的PCRF，从而实现了Gx/Rx会话的PCRF绑定。
可选地，所述用户终端40还设置为在确定需要建立第二IP-CAN会话时，将所述PRCF的相关信息通过网络发送给所述PGW 42。所述PGW 42还设置为在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。通过该可选实施方式将同一个用户的Gx接口会话绑定到同一个PCRF上。
可选地，所述用户终端40还设置为在所述PRCF的相关信息通过网络发送给所述PGW 42之前，确定所述第二IP-CAN会话与所述第一IP-CAN会话使用相同的接入点(APN)。通过该可选实施方式，可以将用户使用同一接入点的接入的Gx接口会话绑定到同一个PCRF上。
通过本发明实施例提供的上述系统，在多PCRF组网时，PGW通过将Gx会话分配的PCRF主机信息传递到移动终端，再通过移动终端转发出去，AF或者PGW(PDN-Gateway，PDN网关)接收到后，将其设置为Rx/Gx会话中Diameter消息的目的主机名，从而实现将同一个用户并发的多个Gx/Rx会话路由到相同的PCRF主机上。
根据当前协议，移动终端(UE)与PGW(PCEF的功能实际上是PGW网元实现的)之间，可通过PCO(Protocol Configuration Options，协议配置选项)参数双向透传信息。本发明可选实施例中借用此机制，通过扩展PCO，将需要绑定的PCRF信息从PGW透传到移动终端，以实现Gx/Rx会话的绑定，或者Gx/Gx会话的绑定。
在本发明实施例中，可以通过对现有信令的消息进行扩展，以传输所述PCRF的相关信息。其中，PDN连接请求(PDN CONNECTIVITY REQUEST)消息可以按照表1所示进行扩展，在已经存在的PCO信息单元中增加“PCRF-Info”信息。
表1.
Figure PCTCN2014089233-appb-000001
激活承载请求(Activate dedicated EPS bearer context request)/PDN连接接受消息可以按照表2进行扩展，如表2所示，在已经存在的PCO信息单元中增加“PCRF-Info”信息。
表2.
Figure PCTCN2014089233-appb-000002
创建会话请求(Create Session Request)消息，可以按照表3进行扩展，如表3所示，在已经存在的PCO信息单元中增加“PCRF-Info”参数。
表3.
Figure PCTCN2014089233-appb-000003
创建会话响应(Create Session Response)消息可以按照表4进行扩展，如表4所示，在已经存在的PCO信息单元中增加“PCRF-Info”参数。
表4.
Figure PCTCN2014089233-appb-000004
而PCO信息单元可以按照表5进行扩展，如表5所示，在附加参数列表(octets w+1to z)扩展了0012H(即PCRF的相关信息)。
表5.
Figure PCTCN2014089233-appb-000005
Figure PCTCN2014089233-appb-000006
在本发明实施例中，移动终端到网络方向(MS to network direction):
-0001H(P-CSCF IPv6 Address Request)；
-0002H(IM CN Subsystem Signaling Flag)；
-0003H(DNS Server IPv6 Address Request)；
-0004H(Not Supported)；
-0005H(MS Support of Network Requested Bearer Control indicator)；
-0006H(Reserved)；
-0007H(DSMIPv6 Home Agent Address Request；
-0008H(DSMIPv6 Home Network Prefix Request)；
-0009H(DSMIPv6 IPv4 Home Agent Address Request)；
-000AH(IP address allocation via NAS signalling)；
-000BH(IPv4 address allocation via DHCPv4)；
-000CH(P-CSCF IPv4 Address Request)；
-000DH(DNS Server IPv4 Address Request)；
-000EH(MSISDN Request)；
-000FH(IFOM-Support-Request)；
-0010H(IPv4 Link MTU Request)；
-0011H(MS support of Local address in TFT indicator)；
-0012H(PCRF-Info)；and
-FF00H to FFFFH reserved for operator specific use.
网络到移动终端方向(Network to MS direction):
-0001H(P-CSCF IPv6 Address)；
-0002H(IM CN Subsystem Signaling Flag)；
-0003H(DNS Server IPv6 Address)；
-0004H(Policy Control rejection code)；
-0005H(Selected Bearer Control Mode；
-0006H(Reserved)；
-0007H(DSMIPv6 Home Agent Address)；
-0008H(DSMIPv6 Home Network Prefix)；
-0009H(DSMIPv6 IPv4 Home Agent Address)；
-000AH(Reserved)；
-000BH(Reserved)；
-000CH(P-CSCF IPv4 Address)；
-000DH(DNS Server IPv4 Address)；
-000EH(MSISDN)；
-000FH(IFOM-Support)；
-0010H(IPv4 Link MTU)；
-0011H(Network support of Local address in TFT indicator)；
-0012H(PCRF-Info)；and
-FF00H to FFFFH reserved for operator specific use.
表6示出了本发明可选实施例中RCRF-Info信息单元的定义。如表6所示，PCRF-Info信息主要包括：PCRF主机名和PCRF绑定方法，其中，N最大为128。
表6.
Figure PCTCN2014089233-appb-000007
在本发明实施例中，还可以对SIP信令的INVITE消息进行扩展，增加私有头域P-PCRF-Host-Name，定义如下：
P-PCRF-Host-Name＝"P-PCRF-Host-Name"HCOLON hostname
其中，Hostname的定义可以参见RFC 3261。
在本发明可选实施例中，PCEF(实际上是PGW网元)接收到SGW(Serving Gateway，服务网关)的创建会话请求消息(Create Session Request)，建立Gx接口的IP-CAN(IP-Connectivity Access Network，IP连接接入网)会话时，根据运营商策略获取PCRF主机名，绑定方法可以基于APN，或者基于用户；创建会话后，PCEF发送创建会话响应消息(Create Session Response)到SGW，携带PCRF绑定信息(绑定的PCRF主机名和绑定方法)；SGW转发创建会话响应消息(Create Session Response)到MME(Mobility Management Entity，移动管理实体)；MME发送PDN连接接受消息(PDN CONNECTIVITY ACCEPT，实际上是激活承载请求消息)转发到用户终端，携带PCRF信息。
用户终端发送SIP(Session Initial Protocol，会话初始协议)信令的INVITE消息时，携带Gx接口分配的PCRF主机名到AF；AF接收到INVITE消息时建立Rx会话，将携带的PCRF主机名设置为AAR(Auth Application Request，鉴权应用请求)消息的目的主机名(Dest-Host)，AF按照目的主机名路由到该PCRF，实现Gx/Rx多会话绑定。
如果用户已经建立Gx会话，同时再用同一个APN建立新的IP-CAN会话时，在PDN连接请求(PDN CONNECTIVITY REQUEST)消息携带PCRF信息，再通过创建会话请求消息(Create Session Request)转发到PGW。PGW建立新的Gx会话时，将携带的PCRF主机名设置为CCR(Credit Control Request)消息的目的主机名(Dest-Host)，PGW按照目的主机名路由到该PCRF，实现Gx/Gx的多会话绑定。
通过本发明实施例提供的上述系统，实现了Gx/Rx多会话绑定，克服了“数据规划方式”和“DRA代理方式”的诸多缺点，实现方式简洁、高效，大大简化了维护工作，提高了系统的可靠性。
根据本发明实施例，还提供了一种多会话绑定装置，该装置可以设置于用户终端40中。
图5为根据本发明实施例的多会话绑定装置的结构示意图，如图5所示，该装置主要包括：接收模块410，设置为接收分组数据网网关(PGW)在为用户终端建立Gx接口的第一IP连接接入网(IP-CAN)会话时分配的策略与计费规则功能实体(PCRF)的相关信息；第一发送模块420，设置为向应用服务器(AF)发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
可选地，所述装置还可以包括：第一确定模块，设置为确定需要建立第二IP-CAN会话；第二发送模块，设置为将所述PCRF的相关信息通过网络发送给所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求(CCR)消息的目的主机。
例如，第二发送模块可以将所述PCRF的相关信息携带在PDN连接请求消息中发送给MME，MME在接收到该消息后，向SGW发送会话创建请求消息，该消息中携带有所述PCRF的相关信息，SGW将该创建请求消息转发给PGW。
可选地，所述装置还可以包括：第二确定模块，设置为确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点APN相同，触发所述第二发送模块。
根据本发明实施例，还提供了一种PCRF信息的发送装置，该装置可以设置在上述PGW中。
图6为根据本发明实施例的PCRF信息的发送装置的结构示意图，如图6所示，该装置主要包括：分配模块62，设置为在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时，为所述第一IP-CAN会话分配PCRF；发送模块64，设置为通过网络，将所述PCRF的相关信息发送给所述用户终端。
可选地，如图6所示，该装置还可以包括：接收模块66，设置为接收为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息； 所述分配模块还设置为将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。
根据本发明实施例，还提供了一种会话建立装置，该装置可以设置在上述AF中。
图7为根据本发明实施例的会话建立装置的结构示意图，如图7所示，该装置主要包括：接收模块72，设置为接收用户终端发送的邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息；设置模块74，设置为在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
根据本发明实施例，还提供了一种多会话绑定方法，该方法可以通过上述的装置或系统完成。
图8为根据本发明实施例的多会话绑定方法的流程图，如图8所示，该方法主要包括以下步骤：
步骤S802，用户终端接收分组数据网网关(PGW)在为所述用户终端建立Gx接口的第一IP连接接入网(IP-CAN)会话时分配的PCRF的相关信息；
步骤S804，所述用户终端向应用服务器AF发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
可选地，在所述用户终端接收所述PCRF的相关信息之后，所述方法还包括：所述用户终端确定需要建立第二IP-CAN会话；所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。通过该可选实施方式，可以将同一用户的Gx会话绑定到同一PCRF。
可选地，在所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW之前，所述方法还可以包括：所述用户终端确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点(APN)相同。即将用户通过同一接入点接入的Gx会话绑定到同一PCRF。
可选地，所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW可以包括：所述用户终端发送分组数据网PDN连接请求消息，其中，所述PDN连接请求消息中携带有所述PCRF的相关信息；移动管理实体接收到所述PDN连接请求消息， 发送创建会话请求消息，其中，所述创建会话请求消息中携带所述PCRF的相关信息；服务网关SGW将所述创建会话请求消息转发给所述PGW。
可选地，用户终端接收分组数据网网关PGW在为所述用户终端建立Gx接口的IP连接接入网IP-CAN会话时分配的PCRF的相关信息，包括：分组数据网网关PGW接收到创建会话请求消息，在建立Gx接口的所述第一IP-CAN会话时，根据运营商策略，获取所述第一IP-CAN会话绑定的所述PCRF；所述PGW将所述PCRF的相关信息携带在创建会话响应消息中发送给服务网关，由所述服务网关通过移动管理实体转发给所述用户终端。
可选地，所述PCRF的相关信息可以包括：所述PCRF的主机名。
可选地，所述PCRF的相关信息还可以包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
根据本发明实施例，还提供了一种策略与计费规则功能实体(PCRF)信息的发送方法，该方法可以通过上述的装置或系统实现。
图9为根据本发明实施例的PCRF信息的发送方法的流程图，如图9所示，该方法主要包括以下步骤：
步骤S902，PGW在为用户终端建立Gx接口的第一IP连接接入网(IP-CAN)会话时，为所述第一IP-CAN会话分配PCRF；
步骤S904，所述PGW通过网络，将所述PCRF的相关信息发送给所述用户终端。
可选地，所述方法还可以包括：所述PGW接收到为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息；所述PGW将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。从而可以将多个Gx接口会话绑定到同一个PCRF。
可选地，所述PCRF的相关信息包括：所述PCRF的主机名。
可选地，所述PCRF的相关信息还包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
根据本发明实施例，还提供了一种会话建立方法，该方法可以通过上述的装置或系统实现。
图10为根据本发明实施例的会话建立方法的流程图，如图10所示，主要包括以下步骤：
步骤S1002，AF接收用户终端发送的邀请消息，其中，所述邀请消息中携带有PCRF的相关信息；
步骤S1004，所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
下面通过具体实施例对本发明实施例提供的技术方案进行说明。
实施例一
本实施例中，以用户终端发起VoIP业务时，Gx/Rx接口的会话绑定为例进行说明。
图11为本实施例中Gx/Rx接口的会话绑定的信令流程图，如图11所示，主要包括以下步骤：
步骤S1101：用户发起VoIP业务，终端发送PDN连接请求消息(PDN CONNECTIVITY request)消息到MME，携带IMSI号码，APN信息；
步骤S1102：MME接收到该消息后，发送创建会话请求消息(Create Session Request)到SGW。
步骤S1103：SGW接收到该消息后，发送创建会话请求消息(Create Session Request)到PGW。
步骤S1104：PGW接收到该消息后，根据用户的IMSI/APN和运营商的PCRF分配和绑定策略，本例假定采用负荷分担策略，发送CCR_I(CCR Initial，CCR初始消息)消息建立Gx会话，消息的Dest-Realm为PCRF的域名，不携带目的主机名。PGW按照负荷分担策略随机选择一个PCRF。
步骤S1105：PCRF接收到CCR(Initial)请求消息后，返回CCA(Credit Control Answer，信用控制响应)响应消息，其源主机名为PCRF的主机名。PGW提取出来，记录为本次会话的PCRF主机名。
步骤S1106：PGW发送创建会话响应消息(Create Session Response)信息到SGW，设置并携带PCRF信息(PCRF主机名，绑定方法[是基于APN的绑定还是基于用户的绑定])；
步骤S1107：SGW接收到该消息后，发送创建会话响应消息(Create Session Response)信息到MME，携带PCRF信息(PCRF主机名，绑定方法)；
步骤S1108：MME接收到该消息后，发送PDN连接接受消息(PDN CONNECTIVITY ACCEPT，实际上是激活承载请求消息)消息，携带PCRF信息(PCRF主机名，绑定方法)；
步骤S1109：终端根据接收到PCRF信息，组装SIP信令的INVITE消息。
步骤S1110：终端发送INVITE消息到AF，通过新增私有头域P-PCRF-Host-Name携带PCRF主机名。
步骤S1111：AF接收到INVITE消息，进行Rx接口会话建立，发送AAR消息，消息的Dest-Host设置为INVITE携带的PCRF主机名，并根据目的主机进行路由，将消息发送到相同的PCRF，实现了Gx/Rx会话的PCRF绑定。
步骤S1112：AF接收到AAA(Auth Application Answer，鉴权应用应答)消息，业务流程继续。
实施例二
本实施例以用户终端发起数据业务时，同一个APN建立新的PDN连接，将多个Gx接口的会话绑定到同一PCRF为例进行说明。
图12为本实施例中多会话绑定的信令流程图，如图12所示，主要包括以下步骤：
步骤S1201—S1208：同实施例一的步骤S1101-步骤S1108；
步骤S809：用户建立新的PDN连接，终端进行判断，已经建立了PDN连接，且APN相同，使用记录的PCRF信息设置PDN连接请求消息；
步骤S1210：终端发送PDN连接请求消息(PDN CONNECTIVITY request)消息到MME，携带IMSI号码，APN信息、PCRF信息；
步骤S1211：MME接收到该消息后，发送创建会话请求消息(Create Session Request)到SGW。
步骤S1212：SGW接收到该消息后，发送创建会话请求消息(Create Session Request)到PGW。
步骤S1213：PGW接收到该消息后，发送CCR_I消息，将创建会话请求消息携带的PCRF主机名设置为CCR_I的目的主机名，并根据目的主机进行路由，将消息发送到同一个PCRF，实现了Gx/Gx接口的PCRF绑定。
从以上的描述中，可以看出，本发明实现了如下技术效果：将Gx会话分配的PCRF主机信息传递到移动终端，再通过移动终端转发出去，AF接收到后，将其设置为Rx会话中Diameter消息的目的主机名，从而实现将同一个用户并发的多个Gx/Rx会话路由到相同的PCRF主机上，克服了“数据规划方式”和“DRA代理方式”的上述缺点，实现方式简洁、高效，大大简化了维护工作，提高了系统的可靠性。
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。
以上所述仅为本发明的优选实施例而已，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保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种多会话绑定方法、装置及系统具有以下有益效果：将Gx会话分配的PCRF主机信息传递到移动终端，再通过移动终端转发出去，AF接收到后，将其设置为Rx会话中Diameter消息的目的主机名，从而实现将同一个用户并发的多个Gx/Rx会话路由到相同的PCRF主机上，其实现方式简洁、高效，大大简化了维护工作，提高了系统的可靠性。

Claims (19)

  1. 一种多会话绑定方法，包括：
    用户终端接收分组数据网网关PGW在为所述用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时分配的策略与计费规则功能实体PCRF的相关信息；
    所述用户终端向应用服务器AF发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
  2. 根据权利要求1所述的方法，其中，在所述用户终端接收所述PCRF的相关信息之后，所述方法还包括：
    所述用户终端确定需要建立第二IP-CAN会话；
    所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。
  3. 根据权利要求2所述的方法，其中，在所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW之前，所述方法还包括：
    所述用户终端确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点APN相同。
  4. 根据权利要求2所述的方法，其中，所述用户终端将所述PCRF的相关信息通过网络发送的所述PGW包括：
    所述用户终端发送分组数据网PDN连接请求消息，其中，所述PDN连接请求消息中携带有所述PCRF的相关信息；
    移动管理实体接收到所述PDN连接请求消息，发送创建会话请求消息，其中，所述创建会话请求消息中携带所述PCRF的相关信息；
    服务网关SGW将所述创建会话请求消息转发给所述PGW。
  5. 根据权利要求1至4中任一项所述的方法，其中，用户终端接收分组数据网网关PGW在为所述用户终端建立Gx接口的IP连接接入网IP-CAN会话时分配的PCRF的相关信息，包括：
    分组数据网网关PGW接收到创建会话请求消息，在建立Gx接口的所述第一IP-CAN会话时，根据运营商策略，获取所述第一IP-CAN会话绑定的所述PCRF；
    所述PGW将所述PCRF的相关信息携带在创建会话响应消息中发送给服务网关，由所述服务网关通过移动管理实体转发给所述用户终端。
  6. 根据权利要求1至4中任一项所述的方法，其中，所述PCRF的相关信息包括：所述PCRF的主机名。
  7. 根据权利要求6所述的方法，其中，所述PCRF的相关信息还包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
  8. 一种多会话绑定装置，包括：
    接收模块，设置为接收分组数据网网关PGW在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时分配的策略与计费规则功能实体PCRF的相关信息；
    第一发送模块，设置为向应用服务器AF发送邀请消息，其中，所述邀请消息中携带有所述PCRF的相关信息，指示所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
  9. 根据权利要求8所述的装置，其中，所述装置还包括：
    第一确定模块，设置为确定需要建立第二IP-CAN会话；
    第二发送模块，设置为将所述PCRF的相关信息通过网络发送给所述PGW，指示所述PGW在建立所述第二IP-CAN会话时，将所述PCRF设置为创建控制请求CCR消息的目的主机。
  10. 根据权利要求9所述的装置，其中，所述装置还包括：
    第二确定模块，设置为确定所述第二IP-CAN会话与所述第一IP-CAN会话使用的接入点APN相同，触发所述第二发送模块。
  11. 一种策略与计费规则功能实体PCRF信息的发送方法，包括：
    分组数据网网关PGW在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时，为所述第一IP-CAN会话分配策略与计费规则功能实体PCRF；
    所述PGW通过网络，将所述PCRF的相关信息发送给所述用户终端。
  12. 根据权利要求11所述的方法，其中，所述方法还包括：
    所述PGW接收到为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息；
    所述PGW将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。
  13. 根据权利要求11或12所述的方法，其中，所述PCRF的相关信息包括：所述PCRF的主机名。
  14. 根据权利要求13所述的方法，其中，所述PCRF的相关信息还包括：会话绑定到PCRF的方法，其中，所述会话绑定到PCRF的方法包括：基于APN绑定或基于用户绑定。
  15. 一种策略与计费规则功能实体PCRF信息的发送装置，包括：
    分配模块，设置为在为用户终端建立Gx接口的第一IP连接接入网IP-CAN会话时，为所述第一IP-CAN会话分配策略与计费规则功能实体PCRF；
    发送模块，设置为通过网络，将所述PCRF的相关信息发送给所述用户终端。
  16. 根据权利要求15所述的装置，其中，
    还包括：接收模块，设置为接收为所述用户终端创建第二IP-CAN会话的请求，其中，所述请求中携带有所述PCRF的相关信息；
    所述分配模块还设置为将分配给所述第一IP-CAN会话的所述PCRF分配给所述第二IP-CAN会话。
  17. 一种会话建立方法，包括：
    应用服务器AF接收用户终端发送的邀请消息，其中，所述邀请消息中携带有策略与计费规则功能实体PCRF的相关信息；
    所述AF在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
  18. 一种会话建立装置，包括：
    接收模块，设置为接收用户终端发送的邀请消息，其中，所述邀请消息中携带有策略与计费规则功能实体PCRF的相关信息；
    设置模块，设置为在为所述用户终端建立Rx接口会话时，将所述PCRF设置为鉴权应用消息的目的主机。
  19. 一种多会话绑定系统，包括：用户终端、分组数据网网关PGW和应用服务器AF，其中，
    所述PGW包括权利要求15或16所述的装置；
    所述用户终端包括权利要求8至10中任一项所述的装置；
    所述AF包括权利要求18所述的装置。
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