WO2009056010A1 - Procédé d'obtention d'une adresse de fonction de commande de session d'appel mandataire en itinérance - Google Patents

Procédé d'obtention d'une adresse de fonction de commande de session d'appel mandataire en itinérance Download PDF

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Publication number
WO2009056010A1
WO2009056010A1 PCT/CN2008/071326 CN2008071326W WO2009056010A1 WO 2009056010 A1 WO2009056010 A1 WO 2009056010A1 CN 2008071326 W CN2008071326 W CN 2008071326W WO 2009056010 A1 WO2009056010 A1 WO 2009056010A1
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WO
WIPO (PCT)
Prior art keywords
aaa
cscf
dhcp
terminal
address information
Prior art date
Application number
PCT/CN2008/071326
Other languages
English (en)
French (fr)
Inventor
Yuzhen Huo
Yangwei Tu
Original Assignee
Zte Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to US12/740,045 priority Critical patent/US8453211B2/en
Publication of WO2009056010A1 publication Critical patent/WO2009056010A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server
    • H04W8/065Registration at serving network Location Register, VLR or user mobility server involving selection of the user mobility server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/50Address allocation
    • H04L61/5007Internet protocol [IP] addresses
    • H04L61/5014Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/08Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0892Network architectures or network communication protocols for network security for authentication of entities by using authentication-authorization-accounting [AAA] servers or protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H04W80/045Network layer protocols, e.g. mobile IP [Internet Protocol] involving different protocol versions, e.g. MIPv4 and MIPv6
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08Upper layer protocols
    • H04W80/10Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/12WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to an access point agent for obtaining an IMS when a user roams through a Global Interoperability for Microwave Access (WiMAX) network access Internet Protocol (IP) Multimedia Subsystem (IMS) network.
  • WiMAX Global Interoperability for Microwave Access
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • P-CSCF session control function
  • WiMAX ⁇ -f IEEE (Institute of Electrical and Electronics Engineers, IEEE 802.16 standard broadband wireless access technology, which can effectively utilize limited wireless spectrum resources to provide large air interface bandwidth (up to 70Mbps) Data transmission capability)
  • the network reference model is shown in Figure 1. It consists of three logical entities: mobile/fixed station (MS/SS), access service network (ASN) and connected service network (CSN).
  • An entity represents a set of functional entities, each functional entity can be implemented in a single physical device or distributed among multiple physical devices.
  • ASN mainly provides WiMAX users with corresponding wireless access and control.
  • CSN provides IP connection services for MS. When a user roams, the CSN is divided into a visited CSN (V-CSN) and a home CSN (H-CSN).
  • R1 is the reference point of the MS and the ASN
  • R2 is the logical reference point
  • R3 is between the ASN and the CSN. Reference point.
  • the dotted line is control signaling.
  • Home Network Service Provider (Home NSP, H-NSP for short) is a local network service provider.
  • H-NSP is an operator or business group that has service level agreements related to WiMAX users, authenticates and authorizes users' sessions (intranet and roaming scenarios), and billing (tickets and billing) for user services.
  • an H-NSP can have roaming relationships with other NSPs.
  • the H-NSP network is composed of an H-CSN (Home Connection Service Network), and mainly includes a Home Authentication, Authorization and Accounting Server (H-AAA) and a Home Agent (HA) network element for storing user subscription services.
  • H-CSN Home Connection Service Network
  • H-AAA Home Authentication, Authorization and Accounting Server
  • HA Home Agent
  • V-NSP Visit NSP, V-NSP for short
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP Visit NSP
  • V-NSP for short
  • WiMAX service The V-NSP can have a roaming agreement with the user's H-NSP, and the V-NSP provides H-AAA service routing to the H-NSP.
  • the V-NSP may provide some or all of the WiMAX service to the roaming user or provide data/control service routing to the H-NSP.
  • the V-NSP network mainly includes a visit authentication, authorization and accounting server (V-AAA) and a home agent (HA) network element that provide proxy forwarding functions.
  • a Network Access Provider is a business unit that provides a WiMAX wireless access infrastructure for one or more WiMAX Network Service Providers (NSPs).
  • the NAP includes one or more access service networks (ASNs), which are mainly composed of a base station (BS) and an access gateway (ASN-GW).
  • ASNs access service networks
  • BS base station
  • ASN-GW access gateway
  • the Foreign Agent is a functional entity in the ASN-GW that provides foreign agent functions for mobile IP terminals.
  • the Home Agent is an entity of the CSN that provides the home agent function for the mobile IP terminal.
  • the HA can be located at the H-CSN or at the V-CSN.
  • WiMAX networks require mobile IP as a mobility management protocol.
  • the mobile IP client maintains a fixed home network IP address between different FAs.
  • Mobile IP Protocol Provides IP routing services for mobile users to public IP networks.
  • the mobility management of WiMAX networks supports two different MIP (Mobile IP) protocols: Client Mobile IP (CMIP) and Proxy Mobile IP (PMIP).
  • CMIP Client Mobile IP
  • PMIP Proxy Mobile IP
  • the terminal and the network in the CMIP application can negotiate to broadcast the broadcast/multicast message and use the reverse tunnel to send such messages to the HA through the tunnel.
  • DHCP Proxy also known as DHCP Proxy
  • DHCP Proxy can act as a functional entity of the ASN-GW to provide DHCP proxy functionality for mobile IP endpoints.
  • DHCP Relay also known as DHCP Relay
  • DHCP Relay can be used as a functional entity of the ASN-GW to provide DHCP relay functions for mobile IP terminals.
  • the DNS server (also known as DNS Server) is deployed by the carrier to maintain the binding between the domain name and the IP address.
  • IMS is the preferred network architecture for next-generation IP services. It is the overall architecture of the future development network. Its architecture enhances the controllability and manageability of IP-based flows, and represents the future development trend of the network. therefore WiMAX access will constitute an important IP access network for the IMS network, which can effectively complement the shortcomings of other wireless access technologies with limited bandwidth.
  • the Call Session Control Function is the core network element of the IMS and can be divided into a Proxy Call Session Control Function (P-CSCF), a Call Session Control Function (I-CSCF), and a Serving Call Session Control Function (S-CSCF).
  • the Home Subscriber Server centrally manages and processes user subscription data in the IMS system.
  • the P-CSCF is the initial entry point for users to access the IMS network and can select the user's home network. WiMAX users need to access the P-CSCF through the WiMAX network and access the IMS network to enjoy the IMS service.
  • the P-CSCF needs to obtain the address of the P-CSCF first when the user needs to access the IMS through the WiMAX system.
  • the P-CSCF can be located in the home network or on the visited network.
  • the P-CSCF can be located in the home network or on the visited network.
  • the technical problem to be solved by the present invention is to provide a method for obtaining a proxy call session control function address during roaming, which solves the problem of determining the location of the P-CSCF in the roaming scenario, and the P-CSCF address information between the home network and the visited network. Interaction problem.
  • the present invention provides a method for obtaining a proxy call session control function address during roaming.
  • a terminal accesses an IP multimedia subsystem IMS through a global microwave access interoperating WiMAX network in a roaming scenario
  • the terminal After receiving the access request message sent by the access service network ASN or the dynamic host configuration protocol DHCP server or the home agent HA of the terminal, the access authentication, authorization, and accounting server V-AAA forwards the access request message to the terminal.
  • the H-AAA determines whether the proxy call session control function P-CSCF is located in the visited network or the home network according to the roaming protocol and the visited network capability, and determines the address information of the determined P-CSCF by H-AAA includes an access accept message corresponding to the access request message The sender of the access request message is returned by V-AAA.
  • the foregoing method may further have the following feature: the V-AAA carries the visited network capability information in the access request message forwarded to the H-AAA, where the visited network of the terminal has the P-CSCF address assigned The V-AAA carries the P-CSCF address information of the visited network in the access request message forwarded to the H-AAA; if the visited network of the terminal has the DHCP server capability, the V-AAA is The access request message forwarded to the H-AAA carries the DHCP server address information of the visited network.
  • the foregoing method may further have the following feature: in an initial access authentication process of the terminal, the ASN sends an access request message to the H-AAA, where the H-AAA determines the ASN based on a roaming protocol. DHCP proxy or DHCP relay.
  • the foregoing method may further have the following feature: in a mobile IP registration process or a dynamic host configuration protocol process of the terminal, the HA sends an access request message to the H-AAA, where the H-AAA is determined based on a roaming protocol.
  • the HA is a DHCP proxy or a DHCP relay.
  • the foregoing method may further have the following feature: if the H-AAA determines that the ASN or the HA is a DHCP proxy, the H-AAA includes the determined address information of the P-CSCF in the access accept message through the V - AAA returns the DCHP proxy, the DCHP proxy saves the address information of the P-CSCF; in the dynamic host configuration protocol process, the DHCP proxy sends the address information of the P-CSCF to the DHCP confirmation message to terminal.
  • the foregoing method may further have the following feature: if the H-AAA determines that the ASN or the HA is a DHCP relay, the access accept message returned by the H-AAA to the V-AAA includes a DHCP server address.
  • the DHCP relay obtains the DHCP server address information.
  • the DHCP relay forwards the DHCP notification message to the DHCP server, and the DHCP server will P The -CSCF address information is sent to the terminal through the DHCP relay.
  • the above method may also have the following features, and the H-AAA will include a visited network.
  • the message of the DHCP server address information is returned to the V-AAA; or the H-AAA returns a message containing the DHCP server address information of the home network to the V-AAA.
  • the AAA protocol of the rights, authorization, and accounting interacts with the V-AAA, or interacts with the network management system by using the network management protocol, or obtains the address information of the P-CSCF through static configuration.
  • the foregoing method may further have the following feature: after receiving the DCHP notification message, the DHCP server sends an access request message to the V-AAA.
  • the foregoing method may further have the following feature: when the HA is a DHCP relay, the HA interacts with the V-AAA by using an AAA protocol, or interacts with the network management system by using a network management protocol, or is configured by static configuration. Obtain the DHCP server address information.
  • the foregoing method may further have the following features: after determining whether the P-CSCF is located in the visited network or the home network according to the roaming protocol and the visited network capability, the H-AAA further includes the following steps:
  • the H-AAA does not return any P-CSCF address information to the V-AAA in the access accept message, and the P-CSCF address information is specified by the V-AAA and included in the access accept message; or
  • the H-AAA includes the P-CSCF address information of the visited network in the access accept message and returns it to the V-AAA; or
  • the H-AAA returns the P-CSCF address information of the home network to the V-AAA.
  • the foregoing method may further have the following feature: if the terminal is a CMIP terminal, and the reverse tunnel is not used, the ASN is used as a DHCP proxy; if the terminal is a CMIP terminal, and the reverse tunnel is used , then HA acts as a DHCP proxy.
  • the foregoing method may further have the following feature: if the terminal is a CMIP terminal, and the reverse tunnel is not used, the ASN is used as a DHCP relay; if the terminal is a CMIP terminal, and the reverse is used In the tunnel, the HA acts as a DHCP relay.
  • the foregoing method may further have the following feature: the address information of the P-CSCF includes: an IP address of the P-CSCF, or a P-CSCF domain name and an address of the DNS server; and the address information of the P-CSCF is P- When the CSCF domain name and the DNS server address are used, the terminal uses the P-CSCF domain name to query the DNS server for the IP address of the P-CSCF.
  • the invention solves the problem of how to determine whether the P-CSCF is located in the visited network or the home network according to the related information in the roaming scenario, and the intersection of the P-CSCF address information between the home network and the visited network.
  • Mutual problem which enables the user terminal to obtain P-CSCF address information when roaming.
  • FIG. 1 is a schematic diagram of a reference model of a WiMAX network and an IMS network interworking network architecture
  • FIG. 2 is a flowchart of a P-CSCF found in a DHCP proxy application of the ASN-GW of the present invention
  • FIG. 3 is a P-CS proxy of the present invention as a DHCP proxy application.
  • -CSCF flow chart H-AAA returns P-CSCF domain name and DNS server address
  • FIG. 4 is a flowchart of the P-CSCF found in the ASN-GW of the present invention as a DHCP relay application
  • FIG. 5 is a flowchart of the P-CSCF found in the ASN-GW of the present invention as a DHCP relay application (H-AAA returns the P-CSCF domain name And DNS server address);
  • FIG. 6 is a flowchart of discovering a P-CSCF by using a reverse tunnel HA as a DHCP proxy in the CMIP application of the present invention
  • H-AAA returns a P-CSCF domain name and a DNS server address
  • Figure 8 is a reverse tunnel HA used as a DHCP relay discovery in the CMIP application of the present invention.
  • H-AAA returns the P-CSCF domain name and the DNS server address).
  • the present invention provides a method for a roaming user to obtain a P-CSCF address, which solves the problem of determining the location of the P-CSCF in the roaming scenario and the interaction of the P-CSCF address information between the home network and the visited network.
  • V-AAA and H-AAA negotiate whether the home network or the visited network provides the terminal with the address information of the required service network, and the address information is a DHCP server address or address information of the P-CSCF.
  • the V-AAA receives the access request message of the ASN-GW/HA, Sending an access request message to the H-AAA, the message carries the visited network capability information, and the H-AAA returns the address information of the P-CSCF to the ASN-GW or the HA as the DHCP proxy according to the roaming protocol and the visited network capability information.
  • H-AAA decides to return the DHCP server address to the ASN-GW or HA when the ANS-GW or HA is used as the DHCP relay; the DHCP server further obtains the P-CSCF address information; the terminal initiates the DHCP process from the ASN - The GW or the HA obtains the P-CSCF address information, or obtains the P-CSCF address information from the DHCP server through the ASN-GW or the HA.
  • FIG. 2 is a flow chart of the P-CSCF found in the ASN-GW as a DHCP proxy (DHCP Proxy) application.
  • Steps 201-207 are the access authentication procedure of the terminal MS in the roaming state.
  • V-AAA and H-AAA interaction P-CSCF address information and the DHCP server (DHCP server) address are simply drawn.
  • the incoming request and the access acknowledgement message, other messages not embodied in the figure are the same as the messages in the prior art.
  • Step 201 The terminal initiates an access request message by using a function entity authenticator (Authenticator) of the ASN-GW.
  • Step 202 The Authenticator sends an access request message to the V-AAA.
  • Authenticator function entity authenticator
  • Step 203 The V-AAA sends an access request message to the H-AAA.
  • the V-AAA brings the visited network information to the H-AAA in the access request message for reference by the H-AAA.
  • the visited network information includes the P-CSCF address information of the visited network; when the visited network has the DHCP server capability, the visited network information includes the DHCP server address information of the visited network. In this embodiment, the visited network does not have the DHCP server capability.
  • Step 204 The H-AAA is determined according to information such as a V-NSP and an H-NSP roaming protocol.
  • the ASN-GW acts as a DHCP Proxy (DHCP proxy) and determines whether the P-CSCF is located in the visited network or the home network. After the H-AAA determines, the corresponding P-CSCF address information (in this embodiment, the IP of the P-CSCF) Address) Notifies V-AAA in the access accept message.
  • the H-AAA determines whether the P-CSCF is located in the visited network or the home network according to the content signed in the roaming agreement, whether the P-CSCF is located in the visited network or the home network, and whether the P-CSCF can be located in the roaming agreement. Visit the network. Furthermore, if the roaming network supports it, the local policy of H-AAA can determine whether the P-CSCF is visiting the network. In addition, if it is an emergency service, the P-CSCF must be visiting the network.
  • H-AAA does not return any P-CSCF information to V-AAA, and V-AAA directly specifies P-CSCF address information, or;
  • H-AAA returns the P-CSCF address information that V-AAA brings to H-AAA to V-AAA, or;
  • H-AAA returns the P-CSCF address information of the home network to V-AAA.
  • the first two cases determine the processing mode when the P-CSCF is located in the visited network, and the third case determines the processing mode when the P-CSCF is located in the home network.
  • the visited network does not have the DHCP server capability. Therefore, the H-AAA decides to use the ASN-GW as a DHCP proxy. If the visited network has the DHCP server capability, then step 205, the V-AAA returns the H-AAA. Or the IP address of the P-CSCF specified by the V-AAA is returned to the functional entity Authenticator of the ASN-GW in the access accept message.
  • Step 206 The functional entity Authenticator of the ASN-GW notifies the DHCP proxy of the P-CSCF address information, and the DHCP proxy stores the address information (such as the IP address) of the P-CSCF.
  • Step 207 The Authenticator sends an access accept message to the terminal. Access authentication is completed. After the access authentication is completed, the terminal may not initiate step 208 immediately, but initiates when the terminal needs to trigger the IMS service.
  • Step 208 The terminal sends a DHCP notification message to the DHCP proxy to obtain the address information of the P-CSCF.
  • Step 209 The DHCP proxy returns the P-CSCF address information to the terminal in a DHCP confirmation message.
  • FIG. 3 Another embodiment of the present invention is illustrated in Figure 3, and steps 301-309 are identical to steps 201-209. Only in this embodiment, the P-CSCF address information returned by H-AAA is the P-CSCF domain name and the DNS server address.
  • Step 310 The terminal obtains the P-CSCF domain name and the DNS server address, and the terminal needs to obtain the address of the P-CSCF through a DNS query.
  • Steps 401-407 are access authentication procedures.
  • FIG. 4 only the V-AAA and H-AAA interaction P-CSCF address information and the DHCP server address access request and the access acknowledgement message are simply drawn.
  • the message embodied in the figure is the same as the message in the prior art.
  • Steps 401 - 402 the terminal sends an access request message to the V-AAA through the Authenticator.
  • Step 403 The V-AAA sends an access request message to the H-AAA.
  • V-AAA brings the visited network information to the H-AAA in the access request message; when the visited network has the ability to allocate the P-CSCF address, the visited network information includes the P-CSCF address information of the visited network; when the visited network has a DHCP server When the capability is met, the visited network information contains the DHCP server address information of the visited network.
  • the visited network has the capability of a DHCP server, that is, the V-CSN includes a DHCP server.
  • Step 404 The H-AAA determines whether the ASN-GW is a DHCP Proxy or a DHCP Relay according to information such as a V-NSP and an H-NSP roaming protocol. In this embodiment, the H-AAA determines the ASN-GW as a DHCP relay according to information such as the V-NSP and the H-NSP roaming protocol. After the H-AAA determines, the address of the corresponding DHCP server is notified to the V-AAA in the access accept message. The following may exist:
  • H-AAA does not return any DHCP server information to V-AAA, and the ASN-GW acts as a DHCP proxy, or; 2) H-AAA returns the DHCP server address information of the V-AAA to the H-AAA to the V-AAA. At this time, the ASN-GW acts as a DHCP relay, or;
  • H-AAA returns the DHCP server address information of the home network to V-AAA.
  • the ASN-GW acts as a DHCP relay.
  • the DHCP server and P-CSCF returned above are on the same network.
  • the P-CSCF is located in the visited network; when the DHCP server of the home network is connected to the P-CSCF, the P-CSCF is located in the home network.
  • Step 405 the V-AAA then returns the DHCP server address to the function entity Authenticator of the ASN-GW in the access accept message.
  • Step 406 The functional entity Authenticator of the ASN-GW notifies the address of the DHCP relay DHCP server, and the DHCP relay saves the related information.
  • Step 407 The Authenticator sends an access accept message to the terminal. Access authentication is completed. After the access authentication is completed, the terminal may not initiate step 408 immediately, but initiates when the terminal needs to trigger the IMS service.
  • Step 408 The terminal sends a DHCP notification message to the DHCP relay to obtain the address information of the P-CSCF.
  • Step 409 The DHCP relay sends the DHCP notification message to the DHCP server.
  • Step 411 When the visited network has the capability to allocate the P-CSCF address, the V-AAA may notify the H-AAA of the P-CSCF address information of the visited network in the access request message.
  • the H-AAA determines whether the P-CSCF is located in the visited network or the home network according to information such as the roaming protocol of the V-NSP and the H-NSP, and after the H-AAA determines, the corresponding P-CSCF address information (here)
  • the address information of the P-CSCF is the IP address of the P-CSCF
  • the V-AAA is notified in the access accept message.
  • the P-CSCF address information that H-AAA may return is as described in steps 204-205.
  • the V-AAA then returns the P-CSCF address information to the DHCP server in the access accept message.
  • Steps 414-415 the DHCP server returns the P-CSCF address information in the DHCP confirmation message.
  • the DHCP relay is sent back to the terminal by the DHCP relay.
  • the DHCP server can interact with the V-AAA using the AAA protocol, or interact with the network management system by using the network management protocol, or obtain the address information of the P-CSCF through static configuration.
  • the network management protocol interaction is the same as the method flow described in detail in this article, except that the protocol is used differently.
  • the address information of the P-CSCF is obtained in the latter two ways, the access accept message returned by the V-AAA to the DHCP server may not carry the P-CSCF address information.
  • the DHCP server statically configures the address information of the P-CSCF locally, the configured data is determined by the operator.
  • the terminal queries the DHCP server through the DHCP relay to obtain the address information of the P-CSCF.
  • the present invention focuses on the flow chart using the AAA protocol and the V-AAA interaction mode, and the other modes are not depicted.
  • FIG. 5 Another embodiment of the present invention is shown in Fig. 5, and the flow of steps 501-515 is the same as steps 401-415. Only in this embodiment, the P-CSCF address information returned by the H-AAA is the P-CSCF domain name and the DNS server address.
  • Step 516 The terminal obtains the P-CSCF domain name and the DNS server address, and the terminal needs to obtain the address of the P-CSCF through a DNS query.
  • Figure 6 is a flow chart showing the use of a reverse tunnel in the CMIP application of the present invention and the discovery of a P-CSCF when the HA acts as a DHCP proxy.
  • the ASN-GW is used as a DHCP proxy or a DHCP relay.
  • the network element acting as a DHCP proxy or a DHCP relay can also select the HA. If the reverse tunnel is not used, the ASN-GW is used. If you use a reverse tunnel, you can use HA.
  • Step 601 Initially access the authentication process.
  • Steps 602-604 after the access authentication succeeds, the FA sends a mobile IP broadcast message to the terminal, and the CMIP terminal sends a mobile IP registration request message to the FA, and the FA forwards the message to the HA.
  • the terminal and the FA and HA negotiate to decide to use the reverse tunnel to process the DHCP notification. Message.
  • Step 605 The HA acquires P-CSCF address information from the V-AAA by using an access request message.
  • the H-AAA determines the HA as a DHCP proxy according to the information such as the roaming protocol of the V-NSP and the H-NSP, and determines whether the P-CSCF is located in the visited network or the home network. After the H-AAA determines, the corresponding P is determined.
  • the -CSCF address information (in this embodiment, the address information of the P-CSCF is the IP address of the P-CSCF) is notified to the V-AAA in the access accept message.
  • the P-CSCF address information that H-AAA may return is as described in steps 204-205.
  • the V-AAA then returns the P-CSCF address information to the HA in the access accept message.
  • the HA, DHCP server, and P-CSCF are on the same network.
  • the P-CSCF is located in the visited network; when the HA of the home network is connected with the P-CSCF, the P-CSCF is located in the home network.
  • the HA can interact with the V-AAA using the AAA protocol, or interact with the network management system by using the network management protocol, or obtain the P-CSCF address information through static configuration.
  • the present invention focuses on the use of a flow chart through the AAA protocol and the V-AAA interaction mode, and the other methods are not depicted in the drawings.
  • the P-CSCF address information may not be carried in the access accept message returned by the V-AAA to the HA.
  • the above steps 605-608 may be performed at this time, or may be performed when the terminal initiates a DHCP notification message to obtain P-CSCF address information.
  • Step 609-610 the HA sends a mobile IP registration response to the terminal through the FA, and the mobile IP registration is completed.
  • the terminal may not initiate step 611 immediately, but initiates when the terminal needs to trigger the IMS service.
  • Steps 611-612 The terminal sends a DHCP notification message, and the FA sends the message to the HA. Steps 613-616 are the same as steps 605-608. When the HA does not obtain the P-CSCF address information in the mobile IP registration process, the steps 613-616 are performed to obtain the P-CSCF address information.
  • Step 617-618 the HA acts as a DHCP proxy to return the P-CSCF address information to the terminal through the FA in the DHCP confirmation message.
  • Steps 701-718 are the same as steps 601-618. Only in this embodiment, the P-CSCF address information returned by H-AAA is the P-CSCF domain name and the DNS server address.
  • Step 719 The terminal obtains the P-CSCF domain name and the DNS server address, and the terminal needs to obtain the address of the P-CSCF through a DNS query.
  • Figure 8 is a reverse tunnel used in the CMIP application of the present invention, and HA is found as a DHCP relay.
  • Steps 801-804 are the same as steps 601-604.
  • Steps 805-806 are the same as steps 605-606.
  • H-AAA determines the HA as a DHCP relay according to information such as the roaming protocol of the V-NSP and the H-NSP, and after the H-AAA determines, the address of the corresponding DHCP server is notified in the access accept message. -AAA.
  • the address of the DHCP server that H-AAA may return is as described in steps 404-405.
  • V-AAA then returns the DHCP server address to the HA in the access accept message.
  • the HA, DHCP server, and P-CSCF are on the same network.
  • the HA can interact with the V-AAA using the AAA protocol, or interact with the network management system by using the network management protocol, or obtain the DHCP server address through the static configuration of the HA itself.
  • the present invention focuses on the use of a flow chart through the AAA protocol and the V-AAA interaction mode, and other methods are not depicted.
  • the V-AAA returns an access accept message to the HA.
  • the DHCP server address may not be carried.
  • steps 805-808 may be performed at this time, or may be performed when the terminal initiates a DHCP notification message to obtain P-CSCF address information.
  • Steps 809-810 Mobile IP registration is completed.
  • the terminal may not initiate step 811 immediately, but initiates when the terminal needs to trigger the IMS service.
  • Steps 811-812 the terminal sends a DHCP notification message, and the FA sends the message to the HA.
  • Steps 813-816 are the same as steps 805-808.
  • the HA does not perform the DHCP server registration procedure in steps 805-808 to obtain the DHCP server address, perform steps 613-616 to obtain the DHCP server address.
  • Step 817 as a DHCP relay, the HA relays the DHCP notification message to the DHCP service.
  • Steps 818-821 are the same as steps 410-413.
  • Step 822 The DHCP server returns the P-CSCF address information to the DHCP confirmation message.
  • Steps 823-824 as a DHCP relay, the HA returns the P-CSCF address information to the terminal through the FA in the DHCP confirmation message.
  • Steps 901-924 are the same as steps 801-824. Only in this embodiment, the P-CSCF address information returned by H-AAA is the P-CSCF domain name and the DNS server address.
  • Step 925 The terminal obtains the P-CSCF domain name and the DNS server address, and the terminal needs to obtain the address of the P-CSCF through a DNS query.
  • the invention solves the problem of how to determine whether the P-CSCF is located in the visited network or the home network according to the related information, and the interaction problem of the P-CSCF address information between the home network and the visited network, so that the user terminal can acquire the P- when roaming.
  • CSCF address information

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Description

一种漫游时获取代理呼叫会话控制功能地址的方法
技术领域
本发明涉及通过全球微波接入互操作 ( World Interoperability for Microwave Access, 简称 WiMAX )网络接入网际协议( IP )多媒体子系统( IP Multimedia Subsystem, IMS ) 网络的用户漫游时获取 IMS的接入点代理呼叫 会话控制功能(P-CSCF )地址的方法。
背景技术
WiMAX ^^-f" IEEE ( Institute of Electrical and Electronics Engineers , 电 气和电子工程师协会) 802.16标准的宽带无线接入技术, 能够有效地利用有 限的无线频谱资源而提供较大的空口带宽(最高 70Mbps的数据传输能力) 。 其网络参考模型如图 1所示,由移动台 /固定台(MS/SS )、接入业务网络(ASN ) 和连接业务网络(CSN )三个逻辑实体组成, 每个逻辑实体代表了一组功能 实体, 每个功能实体可以在单个物理设备或者分布在多个物理设备中实现。 ASN主要为 WiMAX用户提供相应的无线接入和控制。 CSN为 MS提供 IP 连接服务。当用户漫游时, CSN分为拜访 CSN( V-CSN )和归属 CSN( H-CSN )。 图 1中, R1是 MS和 ASN的参考点, R2是逻辑参考点, R3是 ASN和 CSN 之间的参考点。 虚线是控制信令。
归属网络服务提供商 (Home NSP, 简称 H-NSP )为本地网络业务提供 商。 H-NSP是一个运营商或者商业团体, 它有与 WiMAX用户相关的业务等 级协议, 认证和授权用户的会话(网内和漫游场景) , 用户业务的计费 (计 费和帐单) 。 为了支持漫游业务, 一个 H-NSP可以与其它 NSP有漫游关系。 H-NSP网络是由 H-CSN (归属连接业务网络)组成, 主要包含存储用户签约 业务的归属鉴权、 授权及计费服务器(H-AAA )和家乡代理(HA ) 网元。
拜访网络服务提供商( Visit NSP,简称 V-NSP )为拜访网络业务提供商。 V-NSP从漫游用户的角度来定义, 漫游用户使用 V-NSP 的无线覆盖访问 WiMAX服务。 V-NSP可与用户的 H-NSP有漫游协议, V-NSP提供到 H-NSP 的 H-AAA业务路由。基于用户 WiMAX业务请求和 H-NSP与 V-NSP之间的 漫游协议, V-NSP可提供部分或者全部 WiMAX业务给漫游用户, 或者提供 数据 /控制业务路由给 H-NSP。 V-NSP网络中主要包含提供代理转发功能的拜 访鉴权、 授权及计费服务器(V-AAA )和家乡代理(HA ) 网元。
网络接入提供商( NAP )是为一个或多个 WiMAX网络服务提供商( NSP ) 提供 WiMAX无线接入架构的商务单元。 NAP中包含一个或者多个接入业务 网络(ASN ) , 主要由基站(BS )和接入网关 (ASN-GW )组成。
外地代理(FA )是 ASN-GW中的一个功能实体, 为移动 IP终端提供外 地代理功能。
家乡代理( HA )是 CSN的一个实体, 为移动 IP终端提供归属代理功能, HA可以位于 H-CSN, 也可以位于 V-CSN。
WiMAX网络要求釆用移动 IP作为移动性管理协议。 在移动 IP框架内, 移动 IP客户端在不同的 FA之间保持固定的归属网络 IP地址。 移动 IP协议 为移动用户提供 IP路由业务到公共 IP网络。 WiMAX网络的移动性管理支持 两种不同的 MIP(移动 IP )协议:客户端移动 IP( CMIP )和代理移动 IP( PMIP )。 根据移动 IP协议, CMIP应用中终端和网络可以协商对广播 /多播消息进行封 装并使用反向隧道, 将此类消息通过隧道发给 HA处理。
动态主机配置协议代理(DHCP Proxy, 也称作 DHCP代理)可以作为 ASN-GW的一个功能实体, 为移动 IP终端提供 DHCP代理功能。
动态主机配置协议中继 (DHCP Relay, 也称作 DHCP 中继)可以作为 ASN-GW的一个功能实体, 为移动 IP终端提供 DHCP中继功能。
域名服务器(DNS Server, 也称作 DNS Server ) 由运营商部署, 负责维 护域名与 IP地址的绑定关系。
由于 WiMAX的连接业务网络只提供了 IP层的连接, 没有定义业务控制 功能,无法提供可控的电信业务, 因此需要与其他成熟的网络融合实现。 IMS 是下一代 IP业务的首选网络架构, 是未来发展网络的整体架构, 其体系架构 增强了对基于 IP流的可控性和可管理性, 代表了未来网络的发展趋势。 因此 WiMAX接入将构成 IMS网络的一种重要的 IP接入网络, 能够有效地补充其 他无线接入技术带宽有限的缺陷。
WiMAX网络与 IMS网络互通的网络架构如图 1所示。 呼叫会话控制功 能(CSCF )是 IMS的核心网元,可以分为代理呼叫会话控制功能(P-CSCF ) , 查询呼叫会话控制功能(I-CSCF ) , 服务呼叫会话控制功能(S-CSCF ) 。 归 属用户服务器(HSS )在 IMS系统中集中管理、 处理用户签约数据。 P-CSCF 是用户接入 IMS网络的初始入口点, 能够选择用户归属网络。 WiMAX用户 需要通过 WiMAX网络接入 P-CSCF后, 接入 IMS网络, 享受 IMS业务。
P-CSCF作为用户接入 IMS网络的初始入口点,当用户需要通过 WiMAX 系统接入 IMS时, 需要首先获得 P-CSCF的地址。
P-CSCF可以位于归属网络,也可以位于拜访网络。 当用户漫游时如何获 取 IMS网络的接入点 P-CSCF的地址信息, 以及如何根据相关信息确定接入 点的 P-CSCF位于拜访网络还是归属网络, 现有技术中还没有相应的解决方 案。
发明内容
本发明要解决的技术问题是提供一种漫游时获取代理呼叫会话控制功能 地址的方法, 解决了漫游场景下 P-CSCF位置的确定问题, 以及归属网络、 拜访网络之间 P-CSCF地址信息的交互问题。
为了解决上述技术问题, 本发明提供了一种漫游时获取代理呼叫会话控 制功能地址的方法, 终端在漫游场景下通过全球微波接入互操作 WiMAX网 络接入 IP 多媒体子系统 IMS 时, 该终端的访问鉴权、 授权及计费服务器 V-AAA在接收到该终端的接入业务网络 ASN或动态主机配置协议 DHCP服 务器或家乡代理 HA发送的接入请求消息后,将其转发给该终端的归属鉴权、 授权及计费服务器 H-AAA, 该 H-AAA根据漫游协议和拜访网络能力确定代 理呼叫会话控制功能 P-CSCF 位于拜访网络还是归属网络, 并将确定的 P-CSCF的地址信息由 H-AAA包含在所述接入请求消息对应的接入接受消息 中通过 V-AAA返回给该接入请求消息的发送者。
进一步的, 上述方法还可具有以下特点, 所述 V-AAA在转发给所述 H-AAA的接入请求消息中携带拜访网络能力信息, 其中, 若该终端的拜访网 络具有分配 P-CSCF地址的能力, 所述 V-AAA在转发给所述 H-AAA的接入 请求消息中携带拜访网络的 P-CSCF 地址信息; 若该终端的拜访网络具有 DHCP服务器能力时, 所述 V-AAA在转发给所述 H-AAA的接入请求消息中 携带拜访网络的 DHCP服务器地址信息。
进一步的, 上述方法还可具有以下特点, 在终端的初始接入鉴权过程中, 所述 ASN向所述 H-AAA发送接入请求消息, 所述 H-AAA基于漫游协议确 定所述 ASN为 DHCP代理或 DHCP中继。
进一步的, 上述方法还可具有以下特点, 在终端的移动 IP注册过程或动 态主机配置协议过程中, 所述 HA向所述 H-AAA发送接入请求消息, 所述 H-AAA基于漫游协议确定所述 HA为 DHCP代理或 DHCP中继。
进一步的,上述方法还可具有以下特点,如果所述 H-AAA确定所述 ASN 或 HA为 DHCP代理,所述 H-AAA将确定的 P-CSCF的地址信息包含在接入 接受消息中通过 V-AAA返回所述 DCHP代理, 所述 DCHP代理保存所述 P-CSCF的地址信息; 在动态主机配置协议过程中, 所述 DHCP代理将所述 P-CSCF的地址信息在 DHCP证实消息中发送给终端。
进一步的,上述方法还可具有以下特点,如果所述 H-AAA确定所述 ASN 或 HA为 DHCP中继, 所述 H-AAA返回给所述 V-AAA的接入接受消息中包 含 DHCP服务器地址信息,所述 DHCP中继获取所述 DHCP服务器地址信息; 在动态主机配置协议过程中,所述 DHCP中继收到终端的 DHCP通知消息后, 转发给所述 DHCP服务器, 所述 DHCP服务器将 P-CSCF地址信息通过所述 DHCP中继发送给终端。
进一步的,上述方法还可具有以下特点,所述 H-AAA将包含拜访网络的
DHCP服务器地址信息的消息返回给 V-AAA; 或者所述 H-AAA将包含归属 网络的 DHCP服务器地址信息的消息返回给 V-AAA。
进一步的, 上述方法还可具有以下特点, 所述 DHCP服务器通过使用鉴 权、 授权及计费 AAA协议与 V-AAA交互, 或者通过使用网络管理协议与网 络管理系统交互, 或者通过静态配置来获取 P-CSCF的地址信息。
进一步的, 上述方法还可具有以下特点, 所述 DHCP服务器收到所述 DCHP通知消息后, 发送接入请求消息至所述 V-AAA。
进一步的, 上述方法还可具有以下特点, 所述 HA为 DHCP中继时, 所 述 HA通过使用 AAA协议与 V-AAA交互, 或者通过使用网络管理协议与网 络管理系统交互, 或者通过静态配置来获取 DHCP服务器地址信息。
进一步的, 上述方法还可具有以下特点, H-AAA根据漫游协议和拜访网 络能力确定 P-CSCF位于拜访网络还是归属网络后, 还包含如下步骤:
所述 H-AAA在所述接入接受消息中不返回给 V-AAA任何 P-CSCF地址 信息, 由 V-AAA指定 P-CSCF地址信息并将其包含在所述接入接受消息中; 或者
H-AAA将所述拜访网络的 P-CSCF地址信息包含在所述接入接受消息中 返回给 V-AAA; 或者
H-AAA将归属网络的 P-CSCF地址信息返回给 V-AAA。
进一步的, 上述方法还可具有以下特点, 若所述终端为 CMIP终端, 且 没有釆用反向隧道, 则由所述 ASN作为 DHCP代理; 若所述终端为 CMIP终 端, 且釆用反向隧道, 则由 HA作为 DHCP代理。
进一步的, 上述方法还可具有以下特点, 若所述终端为 CMIP终端, 且 没有釆用反向隧道, 则由所述 ASN作为 DHCP中继; 若所述终端为 CMIP终 端, 且釆用反向隧道, 则由 HA作为 DHCP中继。
进一步的, 上述方法还可具有以下特点, 所述 P-CSCF的地址信息包括: P-CSCF的 IP地址, 或 P-CSCF域名及 DNS服务器的地址; 所述 P-CSCF的 地址信息为 P-CSCF域名及 DNS服务器地址时, 终端使用该 P-CSCF域名向 该 DNS服务器查询 P-CSCF的 IP地址。
本发明解决了漫游场景下如何根据相关信息确定 P-CSCF位于拜访网络 还是归属网络的问题, 以及归属网络、 拜访网络之间 P-CSCF地址信息的交 互问题, 使用户终端漫游时能够获取 P-CSCF地址信息。 附图概述
图 1是 WiMAX网络与 IMS网络互通网络架构参考模型示意图; 图 2是本发明 ASN-GW作为 DHCP代理应用中发现 P-CSCF流程图; 图 3 是本发明 ASN-GW作为 DHCP代理应用中发现 P-CSCF 流程图 ( H-AAA返回 P-CSCF域名和 DNS服务器地址 ) ;
图 4是本发明 ASN-GW作为 DHCP中继应用中发现 P-CSCF流程图; 图 5是本发明 ASN-GW作为 DHCP 中继应用中发现 P-CSCF 流程图 ( H-AAA返回 P-CSCF域名和 DNS服务器地址) ;
图 6 是本发明 CMIP应用中使用反向隧道 HA作为 DHCP代理发现 P-CSCF流程图;
图 7 是本发明 CMIP应用中使用反向隧道 HA作为 DHCP代理发现 P-CSCF流程图 ( H-AAA返回 P-CSCF域名和 DNS服务器地址 ) ;
图 8 是本发明 CMIP应用中使用反向隧道 HA作为 DHCP 中继发现
P-CSCF流程图;
图 9 是本发明 CMIP应用中使用反向隧道 HA作为 DHCP 中继发现 P-CSCF流程图 ( H-AAA返回 P-CSCF域名和 DNS服务器地址 ) 。
本发明的较佳实施方式
本发明提供了一种漫游用户获取 P-CSCF地址的方法, 解决了漫游场景 下 P-CSCF位置的确定问题, 以及归属网络、拜访网络之间 P-CSCF地址信息 的交互问题。
本发明的主要思想是, V-AAA和 H-AAA协商由归属网络还是拜访网络 为终端提供所需要的服务网络的地址信息,该地址信息是 DHCP服务器地址, 或者是 P-CSCF的地址信息。 V-AAA收到 ASN-GW/HA的接入请求消息时, 发送接入请求消息至 H-AAA, 消息中携带拜访网络能力信息, H-AAA根据 漫游协议和拜访网络能力信息决定由 ASN-GW或 HA作为 DHCP代理时,将 P-CSCF的地址信息返回给 ASN-GW或 HA; H-AAA决定由 ANS-GW或 HA 作为 DHCP中继时, 将 DHCP服务器地址返回给 ASN-GW或 HA; DHCP服 务器进一步获取 P-CSCF地址信息; 终端发起 DHCP过程从 ASN-GW或者 HA获得 P-CSCF地址信息, 或者通过 ASN-GW或 HA从 DHCP服务器获取 P-CSCF地址信息。
下面结合附图对技术方案的实施作进一步的详细描述。
实施例一
图 2是 ASN-GW作为 DHCP代理( DHCP Proxy )应用中发现 P-CSCF 流程图。
步骤 201-207是终端 MS在漫游状态下的接入鉴权流程, 在图 2中只简 单画出了 V-AAA与 H-AAA交互 P-CSCF地址信息和 DHCP server( DHCP服 务器)地址的接入请求和接入认可消息, 其它没有在图中体现的消息与现有 技术中的消息相同。
步骤 201 , 终端通过 ASN-GW的功能实体鉴权器( Authenticator )发起接 入请求消息。 步骤 202 , Authenticator向 V-AAA发送接入请求消息。
步骤 203 , V-AAA向 H-AAA发送接入请求消息。
V-AAA将拜访网络信息在接入请求消息中带给 H-AAA,以供 H-AAA作 为参考。 当拜访网络有能力分配 P-CSCF地址时, 拜访网络信息包含拜访网 络的 P-CSCF地址信息; 当拜访网络具有 DHCP服务器能力时, 拜访网络信 息包含拜访网络的 DHCP服务器地址信息。本实施例中拜访网络不具备 DHCP 服务器能力。
步骤 204 , H-AAA根据 V-NSP 和 H-NSP 的漫游协议等信息决定
ASN-GW作为 DHCP Proxy ( DHCP代理), 并决定 P-CSCF是位于拜访网络 还是归属网络, H-AAA决定后,会将相应的 P-CSCF地址信息(本实施例中 是 P-CSCF的 IP地址)在接入接受消息中通知 V-AAA。 H-AAA根据漫游协议中签署的内容决定由归属网络还是拜访网络为终 端提供接入 IMS网络服务, 即决定 P-CSCF是位于拜访网络还是归属网络, 漫游协议中签署了 P-CSCF是否可以位于拜访网络, 再者, 如果漫游网络支 持, H-AAA的本地策略就可以确定 P-CSCF是否在拜访网络。 另外, 如果是 紧急业务, P-CSCF必须要在拜访网络。
该步骤中, 可能存在下述情况:
1 ) H-AAA不返回给 V-AAA任何 P-CSCF信息, 由 V-AAA直接指定 P-CSCF地址信息, 或者;
2 ) H-AAA将 V-AAA带给 H-AAA的 P-CSCF地址信息返回给 V-AAA, 或者;
3 ) H-AAA将归属网络的 P-CSCF地址信息返回给 V-AAA。
前两种情况是决定 P-CSCF是位于拜访网络时的处理方式, 第三种情况 则决定 P-CSCF是位于归属网络时的处理方式。
由于本实施例中, 拜访网络不具备 DHCP服务器能力, 因此, H-AAA决 定将 ASN-GW作为 DHCP代理, 如果拜访网络具备 DHCP服务器能力, 则 步骤 205 , V-AAA随后将 H-AAA返回的或 V-AAA指定的 P-CSCF的 IP 地址在接入接受消息中返回给 ASN-GW的功能实体 Authenticator。
步骤 206, ASN-GW的功能实体 Authenticator通知 DHCP代理 P-CSCF 地址信息, DHCP代理保存 P-CSCF的地址信息 (如 IP地址 ) 。
步骤 207 , Authenticator将接入接受消息发送给终端。 接入鉴权完成。 接入鉴权完成后, 终端可能不会立刻发起步骤 208, 而是待终端需要触 发 IMS业务时再发起。
步骤 208 , 终端发送 DHCP通知消息给 DHCP代理, 以获取 P-CSCF的 地址信息。
步骤 209, DHCP代理将 P-CSCF地址信息在 DHCP证实消息中返回给终 端。 实施例二
本发明的另一个实施例如图 3所示, 步骤 301-309与步骤 201-209相同。 只是在此实施例中 H-AAA返回的 P-CSCF地址信息是 P-CSCF域名和 DNS 服务器地址。
步骤 310, 终端获得的是 P-CSCF域名和 DNS服务器地址, 则终端需要 通过 DNS查询来获取 P-CSCF的地址。
实施例三
图 4是本发明 ASN-GW作为 DHCP中继应用中发现 P-CSCF流程图。 步骤 401-407是接入鉴权流程,在图 4中只简单画出了 V-AAA与 H-AAA 交互 P-CSCF地址信息和 DHCP服务器地址的接入请求和接入认可消息, 其 它没有在图中体现的消息与现有技术中的消息相同。
步骤 401 -402 , 终端通过 Authenticator向 V-AAA发送接入请求消息。 步骤 403 , V-AAA向 H-AAA发送接入请求消息。
V-AAA将拜访网络信息在接入请求消息中带给 H-AAA; 当拜访网络有 能力分配 P-CSCF地址时, 拜访网络信息包含拜访网络的 P-CSCF地址信息; 当拜访网络具有 DHCP服务器能力时, 拜访网络信息包含拜访网络的 DHCP 服务器地址信息。本实施例中拜访网络具备 DHCP服务器能力, 即 V-CSN中 包含 DHCP服务器。
步骤 404 , H-AAA根据 V-NSP和 H-NSP的漫游协议等信息决定 ASN-GW 作为 DHCP Proxy ( DHCP代理)还是 DHCP Relay ( DHCP中继) 。 本实施 例中, H-AAA根据 V-NSP和 H-NSP的漫游协议等信息决定 ASN-GW作为 DHCP中继。 H-AAA决定后, 将相应的 DHCP服务器的地址在接入接受消息 中通知 V-AAA。 可能存在下述情况:
1 ) H-AAA不返回给 V-AAA任何 DHCP服务器信息, 由 ASN-GW作为 DHCP代理, 或者; 2 ) H-AAA将 V-AAA带给 H-AAA 的 DHCP服务器地址信息返回给 V-AAA, 此时, 由 ASN-GW作为 DHCP中继, 或者;
3 ) H-AAA将归属网络的 DHCP服务器地址信息返回给 V-AAA, 此时, 由 ASN-GW作为 DHCP中继。
通常, 上面返回的 DHCP服务器和 P-CSCF位于同一个网络。 拜访网络 的 DHCP服务器和 P-CSCF连接时, P-CSCF位于拜访网络;归属网络的 DHCP 服务器和 P-CSCF连接时, P-CSCF位于归属网络。
步骤 405, V-AAA随后将 DHCP服务器地址在接入接受消息中返回给 ASN-GW的功能实体 Authenticator。
步骤 406 , ASN-GW的功能实体 Authenticator通知 DHCP中继 DHCP服 务器的地址, DHCP中继保存相关信息。
步骤 407, Authenticator将接入接受消息发送给终端。 接入鉴权完成。 接入鉴权完成后, 终端可能不会立刻发起步骤 408, 而是待终端需要触 发 IMS业务时再发起。
步骤 408 , 终端发送 DHCP通知消息给 DHCP中继, 以获取 P-CSCF的 地址信息。
步骤 409, DHCP中继将上述 DHCP通知消息发送给 DHCP服务器。 步骤 410, DHCP服务器通过接入请求消息向 V-AAA获取 P-CSCF地址 信息。
步骤 411 , 当拜访网络有能力分配 P-CSCF地址时, V-AAA可以将拜访 网络的 P-CSCF地址信息在接入请求消息中通知 H-AAA。
步骤 412-413 , H-AAA根据 V-NSP和 H-NSP 的漫游协议等信息决定 P-CSCF是位于拜访网络还是归属网络, H-AAA决定后, 将相应的 P-CSCF 地址信息 (在此实施例中 P-CSCF的地址信息是 P-CSCF的 IP地址 )在接入 接受消息中通知 V-AAA。 H-AAA可能返回的 P-CSCF地址信息如步骤 204-205 中所描述。 V-AAA随后将 P-CSCF地址信息在接入接受消息中返回给 DHCP 服务器。
步骤 414-415, DHCP服务器将 P-CSCF地址信息在 DHCP证实消息中返 回给 DHCP中继, 由 DHCP中继再发给终端。
在上述步骤 412-413中, DHCP服务器可以使用 AAA协议与 V-AAA交 互, 或者通过使用网络管理协议与网络管理系统交互, 或者通过静态配置来 获取 P-CSCF 的地址信息。 网络管理协议交互和本文中详细描述的方法流程 相同, 只是协议用的不同。 在使用后两种方式获取 P-CSCF 的地址信息时, V-AAA返回给 DHCP服务器的接入接受消息中可以不携带 P-CSCF地址信 息。 DHCP服务器在本地静态配置 P-CSCF的地址信息时,配置的数据由运营 商决定, 终端通过 DHCP中继查询 DHCP服务器获取 P-CSCF的地址信息。 本发明着重对通过 AAA协议与 V-AAA交互方式利用流程图进行了说明, 其 他方式没有再画图描述。
实施例四
本发明的另一个实施例如图 5 所示, 其步骤 501-515 的流程与步骤 401-415相同。只是在此实施例中 H-AAA返回的 P-CSCF地址信息是 P-CSCF 域名和 DNS服务器地址。
步骤 516, 终端获得的是 P-CSCF域名和 DNS服务器地址, 则终端需要 通过 DNS查询来获取 P-CSCF的地址。
实施例五
图 6是本发明 CMIP应用中使用反向隧道, 且 HA作为 DHCP代理时发 现 P-CSCF流程图。
现有技术中是使用 ASN-GW作为 DHCP代理或 DHCP 中继,本发明中, 作为 DHCP代理或者 DHCP中继的网元还可以选择 HA, 如果没有使用反向 隧道, 就釆用 ASN-GW, 如果用反向隧道, 就釆用 HA。
步骤 601 , 初始接入鉴权过程。
步骤 602-604,接入鉴权成功后, FA向终端发送移动 IP广播消息, CMIP 终端发送移动 IP注册请求消息给 FA, FA将该消息转发给 HA。 根据现有移 动 IP协议及草案,终端和 FA、 HA协商决定使用反向隧道来处理 DHCP通知 消息。
步骤 605 , HA通过接入请求消息向 V-AAA获取 P-CSCF地址信息。 步骤 606 , 当拜访网络有能力分配 P-CSCF地址时, V-AAA可以将拜访 网络的 P-CSCF地址信息在接入请求消息中通知 H-AAA。 当拜访网络具有 DHCP服务器能力时, V-AAA可以将拜访网络的 DHCP服务器地址信息在接 入请求消息中通知 H-AAA。
步骤 607-608, H-AAA根据 V-NSP和 H-NSP的漫游协议等信息决定 HA 作为 DHCP代理, 并决定 P-CSCF是位于拜访网络还是归属网络, H-AAA决 定后, 将相应的 P-CSCF 地址信息 (在此实施例中 P-CSCF 的地址信息是 P-CSCF 的 IP地址)在接入接受消息中通知 V-AAA。 H-AAA可能返回的 P-CSCF地址信息如步骤 204-205中所描述。 V-AAA随后将 P-CSCF地址信息 在接入接受消息中返回给 HA。
通常 HA、 DHCP服务器、 P-CSCF位于同一个网络。 拜访网络的 HA和 P-CSCF连接时, P-CSCF位于拜访网络; 归属网络的 HA和 P-CSCF连接时, P-CSCF位于归属网络。
在上述步骤 607-608中 HA可以使用 AAA协议与 V-AAA交互, 或者通 过使用网络管理协议与网络管理系统交互, 或者通过静态配置, 来获取 P-CSCF地址信息。 本发明着重对通过 AAA协议与 V-AAA交互方式利用流 程图进行了说明, 其他方式没有再画图描述。 当使用后两种方式获取 P-CSCF 地址信息时, 步骤 607 - 608中, V-AAA返回给 HA的接入接受消息中可以 不携带 P-CSCF地址信息。
上述步骤 605-608可以在此时执行, 也可以待终端发起 DHCP通知消息 获取 P-CSCF地址信息时执行。
步骤 609-610, HA通过 FA发送移动 IP注册响应给终端,移动 IP注册完 成。
移动 IP注册完成后, 终端可能不会立刻发起步骤 611 , 而是待终端需要 触发 IMS业务时再发起。
步骤 611-612, 终端发送 DHCP通知消息, FA将该消息发送给 HA。 步骤 613-616,与步骤 605-608相同。 当 HA没有在移动 IP注册过程执行 步骤 605-608获取 P-CSCF地址信息时, 此时执行步骤 613-616获取 P-CSCF 地址信息。
步骤 617-618, HA作为 DHCP代理将 P-CSCF地址信息在 DHCP证实消 息中通过 FA返回给终端。
实施例六
本发明的另一个实施例如图 7所示。 步骤 701-718与步骤 601-618相同。 只是在此实施例中 H-AAA返回的 P-CSCF地址信息是 P-CSCF域名和 DNS 服务器地址。
步骤 719, 终端获得的是 P-CSCF域名和 DNS服务器地址, 则终端需要 通过 DNS查询来获取 P-CSCF的地址。
实施例七
图 8是本发明 CMIP应用中使用反向隧道, 且 HA作为 DHCP中继发现
P-CSCF流程图。
步骤 801-804与步骤 601-604相同。
步骤 805-806与步骤 605-606相同。
步骤 807-808, H-AAA根据 V-NSP和 H-NSP的漫游协议等信息决定 HA 作为 DHCP中继, H-AAA决定后,会将相应的 DHCP服务器的地址在接入接 受消息中通知 V-AAA。 H-AAA可能返回的 DHCP服务器的地址如步骤 404-405中所描述。 V-AAA随后将 DHCP服务器地址在接入接受消息中返回 给 HA。 通常 HA、 DHCP服务器、 P-CSCF位于同一个网络。
在上述步骤 807-808中 HA可以使用 AAA协议与 V-AAA交互, 或者通 过使用网络管理协议与网络管理系统交互, 或者通过 HA 自己静态配置, 来 获取 DHCP服务器地址。本发明着重对通过 AAA协议与 V-AAA交互方式利 用流程图进行了说明, 其他方式没有再画图描述。 在使用后两种方式获取 DHCP服务器地址时,步骤 807 - 808中, V-AAA返回给 HA的接入接受消息 中可以不携带 DHCP服务器地址。
上述步骤 805-808可以在此时执行, 也可以待终端发起 DHCP通知消息 获取 P-CSCF地址信息时执行。
步骤 809-810, 移动 IP注册完成。
移动 IP注册完成后, 终端可能不会立刻发起步骤 811 , 而是待终端需要 触发 IMS业务时再发起。
步骤 811-812, 终端发送 DHCP通知消息, FA将该消息发送给 HA。 步骤 813-816,与步骤 805-808相同。 当 HA没有在移动 IP注册过程执行 步骤 805-808获取 DHCP服务器地址时, 此时执行步骤 613-616获取 DHCP 服务器地址。
步骤 817 , 作为 DHCP中继, HA将 DHCP通知消息中继给 DHCP服务 哭口
步骤 818-821同步骤 410-413。
步骤 822 , DHCP服务器将 P-CSCF地址信息在 DHCP证实消息中返回给
HA。
步骤 823-824 , 作为 DHCP中继, HA将 P-CSCF地址信息在 DHCP证实 消息中通过 FA返回给终端。
实施例八
本发明的另一个实施例如图 9所示。 步骤 901-924与步骤 801-824相同。 只是在此实施例中 H-AAA返回的 P-CSCF地址信息是 P-CSCF域名和 DNS 服务器地址。
步骤 925, 终端获得的是 P-CSCF域名和 DNS服务器地址, 则终端需要 通过 DNS查询来获取 P-CSCF的地址。
上述只是本发明实施例。 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当可根据本发明作出各种 相应的改变和变形, 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。
工业实用性
本发明解决了漫游场景下如何根据相关信息确定 P-CSCF位于拜访网络 还是归属网络的问题, 以及归属网络、 拜访网络之间 P-CSCF地址信息的交 互问题, 使用户终端漫游时能够获取 P-CSCF地址信息。

Claims

权 利 要 求 书
1、 一种漫游时获取代理呼叫会话控制功能地址的方法,终端在漫游场景 下通过全球微波接入互操作 WiMAX网络接入 IP多媒体子系统 IMS时,该终 端的访问鉴权、 授权及计费服务器 V-AAA在接收到该终端的接入业务网络 ASN或动态主机配置协议 DHCP服务器或家乡代理 HA发送的接入请求消息 后, 将其转发给该终端的归属鉴权、 授权及计费服务器 H-AAA, 该 H-AAA 根据漫游协议和拜访网络能力确定代理呼叫会话控制功能 P-CSCF位于拜访 网络还是归属网络,并将确定的 P-CSCF的地址信息由 H-AAA包含在所述接 入请求消息对应的接入接受消息中通过 V-AAA返回给该接入请求消息的发 送者。
2、 如权利要求 1所述的方法, 其特征在于, 所述 V-AAA在转发给所述 H-AAA的接入请求消息中携带拜访网络能力信息, 其中, 若该终端的拜访网 络具有分配 P-CSCF地址的能力, 所述 V-AAA在转发给所述 H-AAA的接入 请求消息中携带拜访网络的 P-CSCF 地址信息; 若该终端的拜访网络具有 DHCP服务器能力时, 所述 V-AAA在转发给所述 H-AAA的接入请求消息中 携带拜访网络的 DHCP服务器地址信息。
3、 如权利要求 2所述的方法,其特征在于,在终端的初始接入鉴权过程 中, 所述 ASN向所述 H-AAA发送接入请求消息, 所述 H-AAA基于漫游协 议确定所述 ASN为 DHCP代理或 DHCP中继。
4、 如权利要求 2所述的方法, 其特征在于, 在终端的移动 IP注册过程 或动态主机配置协议过程中, 所述 HA向所述 H-AAA发送接入请求消息, 所 述 H-AAA基于漫游协议确定所述 HA为 DHCP代理或 DHCP中继。
5、 如权利要求 3或 4所述的方法, 其特征在于, 如果所述 H-AAA确定 所述 ASN或 HA为 DHCP代理, 所述 H-AAA将确定的 P-CSCF的地址信息 包含在接入接受消息中通过 V-AAA返回所述 DCHP代理, 所述 DCHP代理 保存所述 P-CSCF的地址信息; 在动态主机配置协议过程中, 所述 DHCP代 理将所述 P-CSCF的地址信息在 DHCP证实消息中发送给终端。
6、 如权利要求 3或 4所述的方法, 其特征在于, 如果所述 H-AAA确定 所述 ASN或 HA为 DHCP中继, 所述 H-AAA返回给所述 V-AAA的接入接 受消息中包含 DHCP服务器地址信息,所述 DHCP中继获取所述 DHCP服务 器地址信息;在动态主机配置协议过程中,所述 DHCP中继收到终端的 DHCP 通知消息后, 转发给所述 DHCP服务器, 所述 DHCP服务器将 P-CSCF地址 信息通过所述 DHCP中继发送给终端。
7、 如权利要求 6所述的方法, 其特征在于, 所述 H-AAA将包含拜访网 络的 DHCP服务器地址信息的消息返回给 V-AAA; 或者所述 H-AAA将包含 归属网络的 DHCP服务器地址信息的消息返回给 V-AAA。
8、 如权利要求 6所述的方法, 其特征在于, 所述 DHCP服务器通过使 用鉴权、 授权及计费 AAA协议与 V-AAA交互, 或者通过使用网络管理协议 与网络管理系统交互, 或者通过静态配置来获取 P-CSCF的地址信息。
9、 如权利要求 6所述的方法, 其特征在于, 所述 DHCP服务器收到所 述 DCHP通知消息后, 发送接入请求消息至所述 V-AAA。
10、 如权利要求 6所述的方法,其特征在于,所述 HA为 DHCP中继时, 所述 HA通过使用 AAA协议与 V-AAA交互, 或者通过使用网络管理协议与 网络管理系统交互, 或者通过静态配置来获取 DHCP服务器地址信息。
11、 如权利要求 1所述的方法, 其特征在于, H-AAA根据漫游协议和拜 访网络能力确定 P-CSCF位于拜访网络还是归属网络后, 还包含如下步骤: 所述 H-AAA在所述接入接受消息中不返回给 V-AAA任何 P-CSCF地址 信息, 由 V-AAA指定 P-CSCF地址信息并将其包含在所述接入接受消息中; 或者
H-AAA将所述拜访网络的 P-CSCF地址信息包含在所述接入接受消息中 返回给 V-AAA; 或者
H-AAA将归属网络的 P-CSCF地址信息返回给 V-AAA。
12、 如权利要求 5所述的方法, 其特征在于, 若所述终端为 CMIP终端, 且没有釆用反向隧道, 则由所述 ASN作为 DHCP代理; 若所述终端为 CMIP 终端, 且釆用反向隧道, 则由 HA作为 DHCP代理。
13、 如权利要求 6所述的方法, 其特征在于, 若所述终端为 CMIP终端, 且没有釆用反向隧道, 则由所述 ASN作为 DHCP中继; 若所述终端为 CMIP 终端, 且釆用反向隧道, 则由 HA作为 DHCP中继。
14、 如权利要求 1所述的方法, 其特征在于, 所述 P-CSCF的地址信息 包括: P-CSCF的 IP地址,或 P-CSCF域名及 DNS服务器的地址;所述 P-CSCF 的地址信息为 P-CSCF域名及 DNS服务器地址时, 终端使用该 P-CSCF域名 向该 DNS服务器查询 P-CSCF的 IP地址。
PCT/CN2008/071326 2007-11-01 2008-06-16 Procédé d'obtention d'une adresse de fonction de commande de session d'appel mandataire en itinérance WO2009056010A1 (fr)

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