WO2007025445A1 - Methode de traitement de gestion de ressource et d'admission et entite fonctionnelle - Google Patents

Methode de traitement de gestion de ressource et d'admission et entite fonctionnelle Download PDF

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Publication number
WO2007025445A1
WO2007025445A1 PCT/CN2006/001844 CN2006001844W WO2007025445A1 WO 2007025445 A1 WO2007025445 A1 WO 2007025445A1 CN 2006001844 W CN2006001844 W CN 2006001844W WO 2007025445 A1 WO2007025445 A1 WO 2007025445A1
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WIPO (PCT)
Prior art keywords
media stream
address information
spdf
stream address
request message
Prior art date
Application number
PCT/CN2006/001844
Other languages
English (en)
French (fr)
Inventor
Yuepeng Chen
Lingyuan Fan
Fuqing Huang
Original Assignee
Huawei Technologies Co., Ltd.
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.)
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN200680012333XA priority Critical patent/CN101160810B/zh
Publication of WO2007025445A1 publication Critical patent/WO2007025445A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/15—Flow control; Congestion control in relation to multipoint traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/824—Applicable to portable or mobile terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS

Definitions

  • the present invention relates to a Next Generation Network (NGN) technology, and more particularly to a resource admission control processing method and a functional entity.
  • NTN Next Generation Network
  • This communication service model is a flow-based QoS guarantee mechanism that strictly controls network resources and provides strict QoS guarantee for the application layer, but there are scalability problems, because each router that the service flow passes must be maintained for it. Soft state, so the IntServ model cannot be used on a large scale.
  • the IETF proposed a differentiated service (DiffServ, Differentiated Services) model.
  • the DiffServ model is a class-based QoS guarantee mechanism that is successful in network deployment, but can only provide relative QoS guarantees, especially when bandwidth is insufficient.
  • the IETF proposed the DS-Aware MPLS TE model, which incorporates the advantages of the DiffServ model and the MPLS-Multi-Protocol Label Switching Traffic Engineering (TE) model to optimize transmission resources and further improve network performance. And efficiency, but there is an N-square problem, and there are difficulties in solving the problem of inter-domain interworking.
  • DQoS Dynamic Quality of Service
  • CAC Connection Admission Control
  • FIG. 1 is a schematic diagram of a basic network framework of an NGN network developed by TISPAN.
  • the NGN network framework is mainly divided into a service layer 110 and an IP (Internet Protocol)-based transport layer (Transport). Layer) 120.
  • IP Internet Protocol
  • Transport Transport
  • the business layer includes the following parts: Core IP Multimedia Subsystem 111, PSTN/ISDN Emulation Subsystem (PES, PSTN/ISDN Emulation Subsystem) 112, Other Multimedia Subsystems (such as Streaming Media Subsystem) , content broadcast subsystem, etc. 113 and application 114. It also includes common components such as billing, user data management, security management, routing databases, and more.
  • the transport layer 120 mainly provides IP interconnection for the User Equipment (UE), and introduces two control subsystems: a NASS (Network Attachment Subsystem) 121 and a Resource Admission Control Subsystem (RACS, Resource and Admission). Control Subsystem 122, these two subsystems are used to hide the transmission technology below the access network and the core network IP layer.
  • NASS Network Attachment Subsystem
  • RACS Resource Admission Control Subsystem
  • the Core IMS subsystem 113 of the service layer mainly includes a Call Session Control Function (CSCF), and the CSCF may further include a Proxy Call Session Control Function (P-CSCF) and a CSCF.
  • P-CSCF Proxy Call Session Control Function
  • S-CSCF Serving Call Session Control Function
  • I-CSCF Interrogating Call Session Control Function
  • the P-CSCF is the first point of contact of the user equipment 130 within the Core IMS subsystem
  • the S-CSCF is responsible for actually processing the network session state
  • the I-CSCF is all subscribers connected to the network operator or connected to the current A contact point within the carrier network of a roaming user located within the service area of the network operator.
  • FIG. 2 is a schematic diagram of the basic architecture of the RACS subsystem under the NGN R1 network architecture that TISPAN is developing, where the QoS and network address of the bearer network (end)
  • the NAT) conversion (NA(P)T, Network Address and Port Translator) accesses the RACS and is controlled by the RACS.
  • the resource admission control subsystem RACS mainly includes an application function entity (AF), a service-based policy decision function (SPDF), and a core network border gateway function entity (C-BGF, Core). Border Gateway Function 3, Access-Resource and Admission Control Function (A-RACF) 4 and Resource Control Enforcement Function (RCEF) 5, RACS and related functional entities
  • AF application function entity
  • SPDF service-based policy decision function
  • C-BGF core network border gateway function entity
  • Border Gateway Function 3 Access-Resource and Admission Control Function
  • A-RACF Access-Resource and Admission Control Function
  • RCEF Resource Control Enforcement Function
  • the relationship and interface can also refer to FIG. 2, wherein the NA(P)T control function is mainly implemented by a signaling interaction process between AP 1, SPDF 2 and C-BGF 3, and others such as A-RACF 4 and RCEF 5 It is mainly used to control access layer QoS resources.
  • the RACS subsystem provides admission control and gateway control functions (including NA(P)T control and DSCP marking).
  • the admission control function involves: checking the subscription data saved by the network attachment subsystem according to the specific policy rules and resources of the operator, and authorizing; checking the availability of the resource, and verifying whether the requested bandwidth is consistent with the predetermined bandwidth and the bandwidth used by the user.
  • a fixed origination process for establishing an IMS session is shown in FIG. 3.
  • the fixed initiation process of the IMS session is mainly applied to the user in the home network.
  • the user's UE is located in the home network, but accesses the IMS core network through the xDSL (Digital Subscriber Line) access mode.
  • the process is as follows:
  • the initiator UE sends a Session Initiation Protocol (SIP) with a Session Description Protocol (SDP) to the P-CSCF, where the Initiator UE sends the Invite request.
  • SIP Session Initiation Protocol
  • SDP Session Description Protocol
  • the SDP proposal carried in the SIP Invite request may be used to represent one or more media of a multimedia session; 302 ⁇ 306, SPDF performs reservation IMS connection processing on the C-BGF; optionally, the SPDF may also require C-BGF Perform NA (P) T binding processing;
  • the P-CSCF is in the next hop CSCF of the initiator UE recorded in the registration process, and forwards the SIP Invite request with the SDP proposal sent by the initiator UE to the corresponding S-CSCF; 06 001844 one 4 one
  • the S-CSCF After receiving the SIP Invite request with the SDP proposal, the S-CSCF performs the acknowledgement service profile processing, and the S-CSCF invokes any initiation service logic required by the initiator user, including the user multimedia service. Service Subscription to perform the requested SDP authorization;
  • the S-CSCF forwards the SIP Invite request with the SDP proposal to the terminating UE.
  • Offer Response The offer response returned by the terminating UE (Offer Response) will be returned to the S-CSCF along the original signaling path;
  • the S-CSCF forwards the received offer response to the P-CSCF.
  • P-CSCF triggers SPDF request A-RACF performs admission control processing based on the received proposal and the proposed response parameters;
  • the C-BGF is configured to perform IMS connection processing.
  • the SPDF may also require the C-BGF to perform NA(P)T binding processing;
  • the P-CSCF feeds back the received offer response Request Response message to the initiator UE.
  • the SPDF performs the IMS connection processing on the C-BGF and also requires the C-BGF to perform the NA (P) T binding process
  • the media stream address information after the NA (P) T binding process is for the A-
  • the RACF is effective; however, it is meaningless for the A-RACF to perform resource admission control processing in advance without obtaining valid media stream address information.
  • the fixed termination (FT, Fixed Termination) of the IMS session is shown in Figure 4.
  • the fixed termination process for establishing an IMS session is mainly applied to users in the home network.
  • the user's UE is located in the home network, but the xDSL is used to register with the IMS core network.
  • the main implementation process is as follows:
  • the SEP Invite request that is sent by the initiator UE and includes the SDP proposal is forwarded to the S-CSCF of the terminating UE. 402. After receiving the SEP Invite request carrying the SDP proposal, the S-CSCF performs the acknowledgement service briefing process, and the S-CSCF invokes any initiated service logic required by the terminating user, including the request based on the user multimedia service contract. SDP authorization;
  • the S-CSCF forwards the received SEP Invite request carrying the SDP proposal to the P-CSCF in the home network of the terminating user.
  • P-CSCF triggers SPDF request in the home network of the terminating user.
  • the A-RACF performs admission control processing based on the received proposal and the proposed response parameters.
  • the SPDF performs the IMS connection processing on the C-BGF.
  • the SPDF may also require the C-BGF to perform the NA (P)T binding process; 412, the S-CSCF is based on Forwarding the SIP Invite request carrying the SDP proposal to the terminating UE from the address information of the terminating UE recorded in the registration process;
  • the terminating UE responds to an initiator response message to the initiator UE according to the media stream subset supported by the SDP proposal sent by the initiator UE.
  • the SDP proposal may represent one or more media of the multimedia session; Will be sent to the P-CSCF;
  • P-CSCF trigger SPDF to configure C-BGF IMS connection processing, optionally, SPDF may also require C-BGF for NA (P) T binding processing;
  • the P-CSCF forwards the offer response message to the S-CSCF.
  • the S-CSCF forwards the offer response message to the initiator UE.
  • the SPDF has sent an admission request message to the A-RACF before the terminating UE has not received the SIP Invite request, thereby making the A- The RACF performs the resource admission control process correspondingly according to the proposal carried in the admission request message sent from the SPDF and its proposed response parameter.
  • the A-RACF in the terminating home network cannot obtain valid media stream address information, and the A-RACF does not obtain valid media stream address information in advance. There is no point in performing resource admission control processing.
  • the invention provides a resource admission control processing method and a functional entity, so that A-RACF The resource admission control process for the media stream becomes meaningful.
  • a resource admission control processing method includes the following steps:
  • the service-based policy determines that the functional entity SPDF, after the successful processing of the IP multimedia subsystem IMS connection of the core network border gateway function entity C-BGF in the originating home network, the admission control of the access network resources in the originating home network
  • the function entity A-RACF sends an admission request message carrying the current media stream address information
  • the A-RACF performs resource admission control processing on the corresponding media stream according to the received admission request message.
  • the method further includes the steps of:
  • the C-BGF needs to perform network address and/or port number conversion NA(P)T binding processing on the media stream.
  • the current media stream address information is:
  • the C-BGF feeds the media stream address information after the A(P)T binding process to the media stream fed back to the SPDF.
  • the method further includes: after the proxy call session control function entity P-CSCF in the originating home network receives the offer response message fed back by the terminating user, triggering the initiator
  • the SPDF in the home network performs a process of configuring an IMS connection to the C-BGF in the originating home network.
  • the current media stream address information is: media stream address information allocated by the terminating user for the media stream.
  • the proposal response message fed back by the terminal user received by the P-CSCF carries media stream address information allocated by the terminating user for the media stream;
  • the method further includes:
  • the P-CSCF sends the media stream address information in the authentication authorization request message to the SPDF;
  • the SPDF uses the media stream address information as a bearer to be carried in the admission request message. Pre-media stream address information.
  • a resource admission control processing method includes the following steps:
  • proxy call session control function entity P-CSCF in the terminating home network determines the current media stream address information, triggers the service-based policy decision function entity SPDF in the terminating home network to accept the access network resource in the terminating home network.
  • the control function entity A-RACF sends an admission request message carrying the current media stream address information;
  • the A-RACF performs resource admission control processing on the corresponding media stream according to the received admission request message.
  • the process of determining, by the P-CSCF, the current media stream address information includes: the terminating user feeds back to the P-CSCF in the terminating home network, and the media stream address information that is allocated by the terminating user to the media stream.
  • Response message the terminating user feeds back to the P-CSCF in the terminating home network, and the media stream address information that is allocated by the terminating user to the media stream.
  • the P-CSCF determines the media stream address information carried in the received response message as the current media stream address information.
  • the response message that the terminating user feeds back to the P-CSCF is: a proposal response Offer Response message; or
  • the method according to claim 8 wherein the triggering the SPDF to send the admission request message carrying the current media stream address information to the A-RACF comprises: determining, by the P-CSCF, the current The media stream address information is carried in the authentication authorization request message and sent to the SPDF in the terminating home network;
  • the SPDF carries the media stream address information carried in the received authentication authorization request message in the admission request message and sends the information to the A-RACF.
  • the method further includes the following steps:
  • the P-CSCF triggers the SPDF in the terminating home network to configure the core network edge gateway function in the terminating home network.
  • C-BGF configures the IP multimedia subsystem IMS connection processing.
  • the method further includes the following steps:
  • the P-CSCF in the terminating home network triggers the SPDF in the terminating home network to process the IMS connection to the C-BGF in the terminating home network.
  • the A-RACF when the A-RACF performs resource admission control processing on the media stream, the following processing is performed:
  • the P-CSCF in the terminating home network triggers the SPDF in the terminating home network to configure the IMS connection for the C-BGF in the terminating home network.
  • the present invention further provides a service-based policy decision function entity, including: a configuration connection message receiving unit, configured to receive and configure an IP multimedia subsystem IMS connection message from a core network border gateway function entity C-BGF;
  • the current media stream address information obtaining unit is configured to convert the current media stream address information after the NA(P)T binding processing from the network address and/or port number carried in the configured IMS connection message;
  • the admission request message construction unit is configured to carry the current media stream address information in the admission request message.
  • the present invention further provides a service-based policy decision function entity, including: an authentication authorization request message receiving unit, configured to receive an authentication authorization request message from the proxy call session control function entity P-CSCF;
  • the current media stream address information obtaining unit is configured to obtain, from the authentication authorization request message, media stream address information that is carried by the terminating user for the media stream;
  • the admission request message construction unit is configured to carry the current media stream address information in the admission request message.
  • the present invention also provides a proxy call session control function entity, including:
  • the current media stream address information determining unit is configured to determine, as the current media stream address information, the media stream address information allocated by the terminal user for the media stream carried in the response message fed back by the terminating user;
  • the resource admission control processing triggering unit is configured to: after the current media stream address information determining unit determines the current media stream address information, trigger the access network resource admission control function entity A-RACF to perform resources by using the service-based policy determining function entity SPDF Admission control processing.
  • the solution of the present invention proposes that in the FO processing flow, the process of A-RACF performing resource admission processing on the media stream occurs after the process of configuring the IMS connection process by the SPDF to the C-BGF, so that it can be realized when the C-BGF is in the SPDF.
  • the SPDF can timely feed the C-BGF back-processed NA(P)T-bound media stream.
  • the address information is sent to the A-RACF, so that the A-RACF can perform resource admission control processing on the corresponding media stream based on the admission request message carrying the accurate media stream address information, so that the resource admission control process performed by the A-RACF becomes truly significance.
  • the solution of the present invention proposes that, after determining the accurate media stream address information, the P-CSCF triggers the A-RACF to perform the corresponding media stream according to the admission request message carrying the determined media stream address information in the FT process.
  • the resource admission control process makes the resource admission control process performed by the A-RACF truly meaningful.
  • FIG. 1 is a schematic diagram of a basic network framework of an NGN network developed by TISPAN in the prior art; a schematic diagram of a basic architecture of a subsystem;
  • FIG. 3 is a schematic diagram of a process of establishing a fixed initiation process of an IMS session in the prior art
  • FIG. 4 is a schematic diagram of a process of establishing a fixed termination process of an IMS session in the prior art
  • FIG. 5 is a schematic diagram of a process applied in the FO process by the present invention. Flow chart of the main implementation principle of the resource admission control processing method
  • FIG. 6 is a schematic diagram of a processing procedure of a first embodiment after implementing a resource admission control processing method applied in a FO processing flow proposed by the present invention
  • FIG. 7 is a flow chart showing the main implementation principle of the resource admission control processing method applied in the FT processing flow according to the present invention.
  • Figure S is a schematic diagram of a processing procedure of a first embodiment after implementing a resource admission control processing method applied in the FT processing flow proposed by the present invention
  • FIG. 9 is a resource admission control station for implementing the application in the FT processing flow according to the present invention.
  • FIG. 10 is a schematic diagram of a processing procedure of a third embodiment after implementing the resource admission control processing method applied in the FT processing flow proposed by the present invention.
  • the main design idea of the solution of the present invention is: In view of the above problems in the prior art, it is proposed that the A-RACF is triggered according to the media stream that contains the current true meaning only after determining the currently valid media stream address information.
  • the media stream information including the address information performs resource admission control processing on the corresponding media stream, so that the resource admission control process performed by the A-RACF becomes truly meaningful.
  • FIG. 5 is a flowchart of the main implementation principle of the resource admission control processing method applied in the FO processing flow proposed by the present invention.
  • the main implementation process is as follows:
  • Step S10 The P-CSCF in the originating network of the initiator receives the prompt response of the terminating user feedback, the Offer Response message;
  • Step S20 The P-CSCF triggers the SPDF in the originating home network to process the IMS connection to the C-BGF in the originating home network;
  • Step S30 After configuring the IMS connection process, the SPDF sends an Admission-Request message carrying the current media stream address information to the A-RACF in the originating home network.
  • Step S40 The A-RACF performs resource admission control processing on the corresponding media stream according to the received Admission-Request message carrying the current media stream address information.
  • the SPDF may require the C-BGF to perform network address and/or port number conversion binding processing on the media stream during the process of configuring the IMS connection to the C-BGF, where:
  • the current media stream address information carried in the Request message is: After performing the NA(P)T binding process on the media stream, the C-BGF binds the processed media stream address information to the NA(P)T fed back to the SPDF.
  • the Offer Response message fed back to the P-CSCF by the terminating user carries the media stream address information allocated by the terminal user for the media stream;
  • the P-CSCF carries the media stream address information carried in the received Offei' Response message in an authentication authorization request (AAR-Request) message and sends it to the SPDF;
  • AAR-Request authentication authorization request
  • the SPDF will use the media stream address information carried in the received AAR-Request message as the current media stream address information to be carried in the Admission-Request message.
  • FIG. 6 is a schematic diagram of a processing procedure of a first embodiment after implementing a resource admission control processing method applied in a FO processing procedure according to the present invention.
  • the specific implementation process is as follows:
  • the initiator UE sends a SIP Invite request with an SDP Offer to the P-CSCF in the originating home network, where the SDP Offer carried in the SIP Invite request sent by the initiator UE can be used to indicate one of the multimedia sessions. Or multiple media;
  • the P-CSCF after receiving the SIP Invite request sent by the initiator UE, the P-CSCF triggers the SPDF in the originating home network to perform the process of reserving the IMS connection to the C-BGF; optionally, the SPDF may also require C. - BGF performs NA(P)T binding processing;
  • the P-CSCF forwards the SIP Invite request with the SDP Offer sent by the initiator UE to the corresponding S-CSCF according to the next hop CSCF of the initiator UE recorded in the registration process.
  • the S-CSCF After receiving the SIP Invite request carrying the SDP Offer, the S-CSCF performs the acknowledgement service process, and the S-CSCF invokes any initiation service logic required by the initiator user, including the user multimedia service contract. Requested SDP authorization;
  • the S-CSCF forwards the SIP Invite request carrying the SDP Offer to the terminating UE.
  • the proposal response returned by the terminating UE is along the original signaling path. Returning to the S-CSCF in the originating network of the initiator; the feedback of the Offer Response message carries the valid media stream address information allocated by the terminating UE for the media stream;
  • the S-CSCF forwards the received offer response to the P-CSCF, where the forwarded Offer Response message carries the valid media stream address information obtained by the S-CSCF.
  • the P-CSCF After receiving the offer response, the P-CSCF sends an authentication and authorization request message to the SPDF.
  • the sent AAR-Request message carries the valid media stream address information obtained by the P-CSCF.
  • the SPDF configures the C-BGF to configure the IMS connection; optionally, the SPDF may also require the C-BGF to perform NA(P)T binding processing;
  • the SPDF sends an admission request Admission-Request message to the A-RACF after the IMS connection processing is successfully processed, and the sent Admission-Request is sent.
  • the message carries the valid media stream address information obtained by the SPDF in the above step 12;
  • SPDF requires C-BGF to perform NA(P)T binding processing in the above process
  • C-BGF performs NA(P)T binding processing as required, and will bind NA(P)T after processing in step 15.
  • the media stream address information is fed back to the SPDF in the Configure IMS Connection message;
  • the SPDF is configured to successfully process the IMS connection, and after obtaining the valid media stream address after the NA(P)T binding process And sending an Admission-Request message to the A-RACF, where the sent Admission-Request message carries valid media stream address information obtained by the SPDF;
  • the A-RACF performs resource admission control on the corresponding media stream according to the media stream information that is included in the received Admission-Request message and includes the media stream address information.
  • the A-RACF feeds back the Admission-Response message to the SPDF.
  • the SPDF After receiving the Admission-Response message fed back by the A-RACF, the SPDF feeds back an authentication authorization response (AAR-Ask) message to the P-CSCF. 620. After receiving the AAR-Answer message fed back by the SPDF, the P-CSCF feeds back the offer response Receive Response message received in the above step " ⁇ 11" to the initiator UE.
  • AAR-Ask authentication authorization response
  • FIG. 7 is a flow chart of the main implementation principle of the resource admission control processing method applied in the FT processing flow proposed by the present invention.
  • the main implementation process is as follows:
  • Step S100 Determine, by the P-CSCF in the terminating home network, the current media stream address station - wherein the determining process of the current media stream address information by the P-CSCF in the terminating home network is as follows:
  • the terminating user feeds back to the P-CSCF in the terminating home network a message carrying the media stream address information allocated by the terminating user for the media stream; wherein the terminating user feeds back to the P-CSCF in the terminating home network
  • the response message may be, but is not limited to, responding to the Offer Response message, or confirming (200 OK) the message.
  • the P-CSCF confirms that the media stream address information carried in the received response message is the current media stream address information.
  • Step S200 The P-CSCF triggers the SPDF request.
  • the A-RACF performs resource admission control processing on the corresponding media stream according to the media stream information including the current media stream address information.
  • the P-CSCF carries the determined current media stream address information in the authentication authorization request AAR-Request message and sends it to the SPDF in the terminating home network.
  • the SPDF carries the media stream address information carried in the received AAR-Request message in the admission request Admission-Response message and sends it to the A-RACF in the terminating home network.
  • the A-RACF performs resource admission control processing on the corresponding media stream according to the received Admission-Response message carrying the current media stream address information determined above.
  • step S200 the A-RACF performs the following processing before performing resource admission control processing on the media stream:
  • the P-CSCF in the terminating home network triggers the SPDF in the terminating home network to configure the IMS connection for the C-BGF in the terminating party's home network.
  • Step S200 Setting the P-CSCF in the terminating home network triggers the SPDF to process the IMS connection to the C-BGF.
  • the P-CSCF in the terminating home network triggers the SPDF to configure the C-BGF.
  • the process of processing the IMS connection may also be performed simultaneously with the process of the resource admission control process performed by the A-RACF on the media stream in step S200.
  • FIG. 8 is a schematic diagram of a processing procedure of a first embodiment after the resource admission control processing method applied in the FT processing flow according to the present invention is implemented.
  • the specific implementation process is as follows:
  • the SIP Invite request sent by the initiator UE and including the SDP Offer is forwarded to the S-CSCF of the terminating UE.
  • the confirmation service briefing process is performed, and the S-CSCF calls any initiation service logic required by the terminating user, including based on the user multimedia service contract. Requested SDP authorization;
  • the S-CSCF forwards the received SIP Invite request carrying the SDP Offer to the P-CSCF in the home network of the terminating user.
  • the P-CSCF after receiving the SIP Invite request carrying the SDP Offer, the P-CSCF triggers the SPDF in the home network of the terminating party to perform the process of reserving the IMS connection to the C-BGF;
  • the P-CSCF forwards the SIP Invite request carrying the SDP Offer received in the foregoing step 3 to the terminating UE after the IMS connection is successfully processed in the foregoing process.
  • the terminating party UE feeds the Offer Response message to the P-CSCF, where the feedback
  • the Offer Response message carries valid media stream address information allocated by the terminating UE for the media stream;
  • the P-CSCF After receiving the Offer Response message, the P-CSCF sends an AAR-Request message to the SPDF.
  • the sent AAR-Request message carries the valid media stream address information obtained by the P-CSCF.
  • the SPDF configures the C-BGF to configure the IMS connection; optionally, the SPDF may also require the C-BGF to perform NA(P)T binding processing;
  • SPDF sends to A-RACF after configuring the IMS connection processing successfully.
  • An Admission-Request message where the sent Admission-Request message carries the valid media stream address information obtained by the SPDF in the foregoing step 811;
  • the A-RACF performs resource admission control on the corresponding media stream according to the media stream information that is included in the received Admission-Request message and includes the media stream address information.
  • the A-RACF feeds back an Admission-Response message to the SPDF.
  • the SPDF feeds back the AAR-Answer message to the P-CSCF.
  • the P-CSCF After receiving the AAR-Answer message fed back by the SPDF, the P-CSCF feeds back the Offer Response message fed back by the terminating UE received in the foregoing step 10 to the S-CSCF in the home network of the terminating party;
  • the S-CSCF in the terminating home network will receive the offer response.
  • the Response message is forwarded to the S-CSCF in the originating home network.
  • FIG. 9 is a schematic diagram of a processing procedure of a second embodiment after the resource admission control processing method applied in the FT processing flow according to the present invention is implemented.
  • the specific implementation process is as follows:
  • Steps 901 ⁇ 911 in Figure 9 are the same as steps 801 ⁇ 811 in Figure 8, and are not described here;
  • the SPDF sends an Admission-Request message to the A-RACF, where the sent
  • the Admission-Request message carries the valid media stream address information obtained by the SPDF in the above step 911;
  • the Admission-Request message performs resource admission control processing on the corresponding media stream
  • the A-RACF feeds back an Admission-Response message to the SPDF.
  • SPDF configures the IMS connection for the C-BGF after receiving the Admission-Response message fed back by the A-RACF; optionally, the SPDF may also require
  • C-BGF performs A(P)T binding treatment; 918.
  • the SPDF feeds back the AAR-Ask message to the P-CSCF.
  • the P-CSCF After receiving the AAR-Answei' message fed back by the SPDF, the P-CSCF feeds back the offer response Response message fed back by the terminating UE received in the foregoing step 10 to the S-CSCF in the home network of the terminating party;
  • the S-CSCF in the terminating home network forwards the received offer response Offer Response message to the S-CSCF in the originating home network.
  • FIG. 10 is a schematic diagram of a processing procedure of a third embodiment after implementing the resource admission control processing method applied in the FT processing flow
  • the specific implementation process is as follows:
  • Steps 1001 - 1009 in Figure 10 are the same as steps 801 ⁇ 809 in Figure 8, and are not described here;
  • the terminating UE feedback acknowledgment (200 OK) message is sent to the P-CSCF in the home network of the terminating end, where the feedback 200 OK message carries the valid media stream address information allocated by the terminating UE for the media stream (wherein the field)
  • the feedback 200 OK message carries the valid media stream address information allocated by the terminating UE for the media stream (wherein the field)
  • the P-CSCF After receiving the 200 O message, the P-CSCF sends an AAR-Request message to the SPDF.
  • the sent AAR-Request message carries the valid media stream address information obtained by the P-CSCF.
  • the SPDF sends an Admission-Request message to the A-RACF, and the sent
  • the Admission-Request message carries the valid media stream address information obtained by the SPDF in the above step 1011;
  • the A-RACF performs resource admission control on the corresponding media stream according to the media stream information that is included in the received Admission-Request message and includes the media stream address information.
  • the A-RACF feeds back an Admission-Response message to the SPDF.
  • the SPDF After receiving the Admission-Response message fed back by the A-RACF, the SPDF configures the C-BGF to configure the IMS connection and open the gate (Open Gates). Processing; optionally, the SPDF may also require the C-BGF to perform NA(P)T binding processing;
  • the SPDF feeds back the AAR-Answer message to the P-CSCF.
  • the P-CSCF After receiving the AAR-Answer message fed back by the SPDF, the P-CSCF feeds back the acknowledgment 200 OK message received by the terminating UE received in the foregoing step 10 to the S-CSCF in the home network of the terminating party;
  • the S-CSCF in the terminating home network forwards the received acknowledgment 200 OK message to the S-CSCF in the originating home network.
  • a configuration connection receiving unit configured to receive a configuration IMS connection message from the C-BGF, where the current media stream address information obtaining unit is configured to obtain the current NA(P)T binding processing carried in the configured IMS connection message Media stream address information;
  • the admission request message construction unit is configured to carry the current media stream address information in the admission request message.
  • another embodiment of the service-based policy-determining function entity of the present invention includes: an authentication authorization request message receiving unit, configured to receive an authentication authorization request message from the P-CSCF;
  • the current media stream address information obtaining unit is configured to obtain, from the authentication authorization request message, media stream address information that is carried by the terminating user for the media stream;
  • the admission request message construction unit is configured to carry the current media stream address information in the admission request message.
  • the proxy call session control function entity P-CSCF in the embodiment of the present invention includes: a current media stream address information determining unit, configured to allocate a media stream address allocated by the terminating user to the media stream carried in the response message fed back by the terminating user. The information is determined as the current media stream address information;
  • a resource admission control processing triggering unit configured to determine, at the current media stream address information After the unit determines the current media stream address information, the A-RACF is triggered by the SPDF to perform resource admission control processing.

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Description

资源接纳控制处理方法及功能实体
技术领域 本发明涉及下一代网络（ NGN, Next Generation Network )技术， 尤 其涉及一种资源接纳控制处理方法及功能实体。
背景技术 在 Internet (互联网）技术诞生以来， 网络通常采用尽力而为 "best effort" 的分发模式进行数据分发， 而不提供服务质量（QoS, Quality of Service )保证。
上世纪 90年代初， 受实时业务如语音 IP ( VoIP, Voice over IP ) 的 驱动, Internet工程任务组 ( IETF , Internet Engineering Task Force )提出 综合服务（IntServ, Integrated Services )模型。 此种通信服务模型是一 种基于流的 QoS保证机制， 对网络资源进行严格的控制， 为应用层提供 严格的 QoS保证， 但是存在扩展性问题， 因为业务流经过的每个路由器 必须为其维护软状态， 因此 IntServ模型无法被大规模使用。
1998年， IETF又提出区分服务 ( DiffServ, Differentiated Services ) 模型。 DiffServ模型是一种基于类的 QoS保证机制， 在网絡部署上比较 成功， 但是只能提供相对的 QoS保证， 特别是当带宽不够时仍然无法保 证 QoS。
2002年， IETF又提出 DS-Aware MPLS TE模型，该模型融入 DiffServ 模型和 MPLS― TE ( Multiprotocol Label Switching Traffic Engineering, 多 协议标签交换流量工程）模型的优点， 优化传输资源， 也进一步提高网 络的性能和效率， 但是存在 N平方问题， 在解决域间互通的问题上存在 困难。
基于当前的现有技术， 无论大带宽， 还是 DiffServ模型都无法真正 解决端到端的 QoS问题。近几年，动态服务质量（DQoS, Dynamic QoS ), 即基于会话的动态 QoS控制机制逐渐成为研究的主向，该机制在控制平 面实现基于每个会话的会话接纳控制 （CAC , Connection Admission Control ), 和资源预留、 以及动态的策略下发， 而在数据平面完成业务感 P T/CN2006/001844
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知和策略执行功能。 这种机制既能够提供严格的 QoS保证， 又具有良好 的可扩展性。 因此目前很多标准组织都在研究类似的机制， 而其中 TISPAN ( Telecommunications and Internet Converged Services and Protocols for Advanced Networking,电信和互联网融合业务及高级网络协 议）组织的研究得到了业界比较广泛的认可。
请参照图 1 ,该图是 TISPAN制定的 NGN网络的基本网络框架示意 图， 其中 NGN网络框架主要分为业务层（ Service Layer ) 110和基于 IP ( Internet Protocol, 网际 ¼、议） 的传输层 ( Transport Layer ) 120。
其中业务层包括以下部分： 核心 IP 多媒体子系统 （Core IP Multimedia Subsystem ) 111、 PSTN/ISDN仿真子系统（PES, PSTN/ISDN Emulation Subsystem ) 112、 其它多媒体子系统（ Other Subsystem, 如流 媒体子系统、 内容广播子系统等） 113 以及应用 （Application ) 114。 另 外还包括一些公共部件， 如计费功能、 用户数据管理、 安全管理、 路由 数据库等。
传输层 120主要为用户设备 ( UE, User Equipment ) 130提供 IP互 连， 引入两个控制子系统： 网络附着子系统（NASS， Network Attachment Subsystem ) 121和资源接纳控制子系统（RACS, Resource and Admission Control Subsystem ) 122,这两个子系统用于隐藏接入网和核心网 IP层以 下的传输技术。
其中，业务层的 Core IMS子系统 113中主要包括呼叫会话控制功能 实体（ CSCF, Call Session Control Function ), 而 CSCF又可以包括代理 CSCF( P-CSCF, Proxy Call Session Control Function )、月良务 CSCF( S-CSCF ― Serving Call Session Control Function ) 和查询 CSCF ( I-CSCF ― Interrogating Call Session Control Function )。其中 P- CSCF是用户设备 130 在 Core IMS子系统内的第一个接触点； S-CSCF负责实际处理网络会话 状态； I-CSCF是所有都连接到该网络运营商的签约用户或者连接到当前 位于该网络运营商的业务区域内的漫游用户的运营商网络内的接触点。
请一并参照图 2, 该图是 TISPAN正在制定的 NGN R1网络架构下 的 RACS子系统的基本架构示意图， 其中承载网的 QoS和网络地址（端 口）转换（NA(P)T, Network Address and Port Translator )都要访问 RACS， 并由 RACS进行控制。
资源接纳控制子系统 RACS主要包括应用功能实体（ AF, Application Function ) 1、基于业务的策略决定功能实体（ SPDF, Service-based Policy Decision Function ) 2、核心网络边界网关功能实体（ C-BGF , Core Border Gateway Function ) 3、 接入层资源接纳控制功能实体 （A-RACF , Access-Resource and Admission Control Function ) 4和资源控制实施功能 实体（RCEF, Resource Control Enforcement Function ) 5， RACS和相关 功能实体的关系和接口亦可参考图 2, 其中 NA(P)T控制功能主要是由 AP 1、SPDF 2和 C-BGF 3之间的信令交互过程来实现的，其它如 A-RACF 4和 RCEF 5主要用于对接入层 QoS资源进行控制。
RACS子系统提供接纳控制功能和关口控制功能（包含 NA(P)T控 制和 DSCP标记）。其中接纳控制功能涉及到：根据运营商的具体策略规 则和资源， 检查网络附着子系统保存的签约数据， 授权； 检查资源可用 性， 校对被请求的带宽是否与预定的带宽和用户使用的带宽一致。
目前， 在基于上述 TISPAN制定的 NGN网络架构中， 建立 IMS会 话的固定发起流程（FO, Fixed Origination )如图 3所示。 其中建立 IMS 会话的固定发起流程主要应用于处于归属网络的用户， 用户的 UE位于 归属网络中， 但是通过 xDSL ( Digital Subscriber Line, 数字用户线路） 接入方式接入到 IMS核心网络， 其主要实现过程如下：
301、 发起方 UE向 P-CSCF发送带有会话描述协议（SDP, Session Description Protocol )提议 ( Offer )的会话发起协议 ( SIP, Session Initial Protocol )邀倩 ( Invite )请求； 其中发起方 UE发送的 SIP Invite请求中 所携带的 SDP提议可以用于表示一个多媒体会话的一个或多个媒体； 302 ~ 306、 SPDF对 C-BGF进行预留 IMS连接处理； 可选的， SPDF 可能还要求 C-BGF进行 NA(P)T绑定处理；
307、 P-CSCF 居从注册流程中记录的该发起方 UE 的下一跳 CSCF, 将发起方 UE发来的带有 SDP提议的 SIP Invite请求转发给对应 的 S-CSCF; 06 001844 一 4一
308、 S-CSCF接收到带有 SDP提议的 SIP Invite请求后， 进行确认 业务筒报 ( Service Profile )处理， 同时 S-CSCF调用该发起方用户所需 的任何发起业务逻辑， 包括基于用户多媒体业务契约 （ Service Subscription )进行所请求的 SDP授权；
309、 S-CSCF转发带有 SDP提议的 SIP Invite请求到终结方 UE;
310、 终结方 UE返回的提议响应（ Offer Response )将沿着原信令路 径返回给 S-CSCF;
311、 S-CSCF转发接收到的提议响应 Offer Response消息给 P-CSCF;
312 ~ 315、 P-CSCF触发 SPDF请求 A-RACF基于接收的提议及提 议响应参数进行接纳控制处理；
316-319、 SPDF在资源接纳成功后， 再对 C-BGF进行配置 IMS连 接处理， 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定处理；
320、 P-CSCF将接收到的提议响应 Offer Response消息反馈给发起 方 UE。
由上述的固定发起流程可见，在发起方用户建立 IMS会话连接过程 中， A-RACF在根据 SPDF发来的接纳请求消息中承载的提议及其提议 响应参数，进行资源接纳控制处理的过程是在 SPDF对 C-BGF进行配置 IMS连接处理过程之前进行的， 这样的处理过程将存在如下问题：
如果 SPDF在对 C-BGF进行配置 IMS 连接处理时， 也同时要求 C-BGF进行 NA(P)T绑定处理， 则该次 NA(P)T绑定处理后的媒体流地 址信息对于 A-RACF而言才是有效的； 而 A- RACF在没有得到有效的媒 体流地址信息时 , 就提前进行资源接纳控制处理是没有意义的。
在基于上述 TISPAN制定的 NGN网络架构中， 建立 IMS会话的固 定终结流程 ( FT, Fixed Termination )如图 4所示。 其中建立 IMS会话 的固定终结流程主要应用于处于归属网络中的用户， 用户的 UE位于归 属网络中， 但是已经使用 xDSL向 IMS核心网络进行注册， 其主要实现 过程如下：
401、 发起方 UE发送的包含 SDP提议的 SEP Invite请求被转发到终 结方 UE的 S-CSCF上； 402、 S-CSCF接收到携带有 SDP提议的 SEP Invite请求后， 进行确 认业务简报处理， 同时 S-CSCF调用该终结方用户所需要的任何发起业 务逻辑， 包括基于用户多媒体业务契约进行所请求的 SDP授权；
403、 S-CSCF将接收到的携带有 SDP提议的 SEP Invite请求转发给 终结方用户归属网络中的 P-CSCF;
404 ~ 407、 P-CSCF 触发终结方用户归属网络中的 SPDF 请求 A-RACF基于接收的提议及提议响应参数进行接纳控制处理；
408 - 411 , SPDF在资源接纳成功后， 再对 C-BGF进行预留 IMS连 接处理， 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定处理； 412、 S-CSCF根据从注册流程中记录的终结方 UE的地址信息将携 带有 SDP提议的 SIP Invite请求转发给终结方 UE;
413、终结方 UE根据发起方 UE发来的 SDP提议所支持的媒体流子 集， 回应一个提议响应消息给发起方 UE; 其中 SDP提议可能表示多媒 体会话的一个或多个媒体； 这个提议响应消息将被发送到 P-CSCF;
414 ~ 418、 P-CSCF触发 SPDF对 C-BGF进行配置 IMS连接处理， 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定处理；
419、 P-CSCF向 S-CSCF转发提议响应消息；
420、 S-CSCF转发提议响应消息给发起方 UE。
由上述的固定终结流程可见，在终结方用户建立 IMS会话连接过程 中， 其中在终结方 UE还没有接收到 SIP Invite请求之前， SPDF就已经 向 A-RACF发送接纳请求消息了， 从而使得 A-RACF在根据 SPDF发来 的接纳请求消息中承载的提议及其提议响应参数， 相应进行了资源接纳 控制处理。 这样的处理过程将存在如下问题：
在终结方 UE还没有接收到 SIP Invite请求之前，终结方归属网络中 的 A-RACF是不能得到有效的媒体流地址信息的， 而 A-RACF在没有得 到有效的媒体流地址信息时， 就提前进行资源接纳控制处理是没有意义 的。
发明内容
本发明提出一种资源接纳控制处理方法及功能实体， 以使 A-RACF 对媒体流进行的资源接纳控制处理变得有意义。
本发明提出的技术方案如下：
一种资源接纳控制处理方法， 包括步骤：
基于业务的策略决定功能实体 SPDF在对发起方归属网络中的核心 网边界网关功能实体 C-BGF配置 IP多媒体子系统 IMS连接的处理成功 后， 向发起方归属网络中的接入网资源接纳控制功能实体 A-RACF发送 承载有当前媒体流地址信息的接纳请求消息；
所述 A-RACF根据接收的接纳请求消息， 对相应媒体流进行资源接 纳控制处理。
可选地， 所述方法还包括步骤：
所述 SPDF在对 C- BGF进行配置 IMS连接的处理时，需所述 C-BGF 对媒体流进行网络地址和 /或端口号转换 NA(P)T绑定处理。
所述承载有当前媒体流地址信息的接纳请求消息中， 该当前媒体流 地址信息为：
C-BGF向所述 SPDF反馈的对媒体流进行 A(P)T绑定处理后的媒 体流地址信息。
在所述 SPDF在对 C- BGF进行配置 IMS连接的处理之前， 还包括： 发起方归属网络中的代理呼叫会话控制功能实体 P-CSCF接收到终 结方用户反馈的提议响应消息后， 触发发起方归属网络中的 SPDF对发 起方归属网络中的 C-BGF进行配置 IMS连接的处理。
可选地， 所述承载有当前媒体流地址信息的接纳请求消息中， 该当 前媒体流地址信息为： 由终结方用户为媒体流分配的媒体流地址信息。
所述 P-CSCF接收到的终结方用户反馈的提议响应消息中承载有由 终结方用户为媒体流分配的媒体流地址信息；
在所述 SPDF向 A-RACF发送承载有当前媒体流地址信息的接纳请 求消息之前， 还包括：
所述 P-CSCF将媒体流地址信息承载在认证授权请求消息中发送给 所述 SPDF;
所述 SPDF将该媒体流地址信息作为要承载在接纳请求消息中的当 前媒体流地址信息。
一种资源接纳控制处理方法， 包括步骤：
终结方归属网络中的代理呼叫会话控制功能实体 P-CSCF确定当前 媒体流地址信息后， 触发终结方归属网络中的基于业务的策略决定功能 实体 SPDF 向终结方归属网络中的接入网资源接纳控制功能实体 A-RACF发送承载有当前媒体流地址信息的接纳请求消息；
所述 A-RACF根据接收的接纳请求消息， 对相应媒体流进行资源接 纳控制处理。
可选地， 所述 P-CSCF确定当前媒体流地址信息的过程包括： 终结方用户向终结方归属网络中的 P-CSCF反馈^ ^载有该终结方用 户为媒体流分配的媒体流地址信息的响应消息；
所述 P-CSCF将接收的响应消息中承载的媒体流地址信息确定为当 前媒体流地址信息。
可选地， 所述终结方用户向所述 P-CSCF反馈的响应消息为： 提议响应 Offer Response消息； 或
确认 200 OK消息。
可选地， 如权利要求 8所述的方法，其特征在于， 所述的触发 SPDF 向 A-RACF发送承载有当前媒体流地址信息的接纳请求消息， 包括： 所述 P-CSCF将确定的当前媒体流地址信息承载在认证授权请求消 息中发送给终结方归属网絡中的 SPDF;
所述 SPDF将接收的认证授权请求消息中承载的媒体流地址信息承 载在接纳请求消息中发送给所述 A-RACF。
可选地， 在所述 A-RACF对媒体流进行资源接纳控制处理之前还包 括步驟：
终结方归属网络中 P- CSCF触发终结方归属网络中的 SPDF对终结 方归属网络中的核心网边缘网关功能 C- BGF进行配置 IP多媒体子系统 IMS连接的处理。
可选地， 在所述 A-RACF对媒体流进行资源接纳控制处理之后还包 括步骤： 终结方归属网络中的 P-CSCF触发终结方归属网络中的 SPDF对终 结方归属网络中的 C-BGF进行配置 IMS连接的处理。
可选地， 在所述 A-RACF对媒体流进行资源接纳控制处理的同时还 进行如下处理过程：
终结方归属网络中的 P-CSCF触发终结方归属网络中的 SPDF对终 结方归属网络中的 C- BGF进行配置 IMS连接的处理。
本发明还提供一种基于业务的策略决定功能实体， 包括： 配置连接消息接收单元，用于从核心网边界网关功能实体 C-BGF接 收配置 IP多媒体子系统 IMS连接消息；
当前媒体流地址信息获取单元， 用于从获取所述配置 IMS连接消息 中承载的网络地址和 /或端口号转换 NA(P)T绑定处理后的当前媒体流地 址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
本发明还提供一种基于业务的策略决定功能实体， 包括： 认证授权请求消息接收单元， 用于从代理呼叫会话控制功能实体 P-CSCF接收认证授权请求消息；
当前媒体流地址信息获取单元， 用于从所述认证授权请求消息中获 取其承载的由终结方用户为媒体流分配的媒体流地址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
本发明还提供一种代理呼叫会话控制功能实体， 包括：
当前媒体流地址信息确定单元， 用于将终结方用户反馈的响应消息 中承载的由该终结方用户为媒体流分配的媒体流地址信息确定为当前媒 体流地址信息；
资源接纳控制处理触发单元， 用于在所述当前媒体流地址信息确定 单元确定当前媒体流地址信息后， 通过基于业务的策略决定功能实体 SPDF触发接入网资源接纳控制功能实体 A-RACF进行资源接纳控制处 理。 本发明能够达到的有益效果如下：
本发明方案提出在 FO处理流程中， A-RACF对媒体流进行资源接 纳处理的过程发生在 SPDF对 C- BGF进行配置 IMS连接处理的过程之 后进行， 从而可以实现当由于在 SPDF对 C-BGF进行配置 IMS连接处 理过程中， SPDF同时要求 C-BGF对媒体流进行 A(P)T绑定处理时， SPDF能够及时将 C-BGF反馈的经 NA(P)T绑定处理后的媒体流地址信 息发送给 A- RACF, 使得 A-RACF能够基于承载有准确的媒体流地址信 息的接纳请求消息对相应媒体流进行资源接纳控制处理， 使 A-RACF进 行的资源接纳控制处理变得真正有意义。
相应的， 本发明方案提出在 FT处理流程中， P-CSCF在确定到准确 的媒体流地址信息后， 才触发 A-RACF根据承载有确定的媒体流地址信 息的接纳请求消息对相应媒体流进行资源接纳控制处理， 从而使得 A-RACF进行的资源接纳控制处理变得真正有意义。
附图说明
图 1为现有技术中 TISPAN制定的 NGN网络的基本网络框架示意 图； 子系统的基本架构示意图；
图 3为现有技术建立 IMS会话的固定发起流程的处理过程示意图； 图 4为现有技术建立 IMS会话的固定终结流程的处理过程示意图； 图 5为本发明提出的应用在 FO处理流程中的资源接纳控制处理方 法的主要实现原理流程图；
图 6为实施本发明提出的应用在 FO处理流程中的资源接纳控制处 理方法后的第一实施例处理过程示意图；
图 7为本发明提出的应用在 FT处理流程中的资源接纳控制处理方 法的主要实现原理流程图；
图 S为实施本发明提出的应用在 FT处理流程中的资源接纳控制处 理方法后的第一实施例处理过程示意图；
图 9为实施本发明提出的应用在 FT处理流程中的资源接纳控制处 理方法后的第二实施例处理过程示意图；
图 10为实施本发明提出的应用在 FT处理流程中的资源接纳控制处 理方法后的第三实施例处理过程示意图。
具体实施方式 本发明方案的主要设计思想是： 针对上述现有技术存在的问题， 提 出只有在确定得到当前真正有效的媒体流地址信息后， 才触发 A-RACF 根据包含当前真正有意义的媒体流地址信息在内的媒体流信息对相应媒 体流进行资源接纳控制处理， 从而使得 A-RACF进行的资源接纳控制处 理变得真正有意义。
下面将结合各个附图， 对本发明的主要实现原理及其具体实施方式 进行详细的阐述。
请参照图 5，该图是本发明提出的应用在 FO处理流程中的资源接纳 控制处理方法的主要实现原理流程图； 其主要实现过程如下：
步骤 S10, 发起方归属网络中的 P-CSCF接收终结方用户反馈的提 议响应 Offer Response消息；
步骤 S20,该 P-CSCF触发发起方归属网络中的 SPDF对发起方归属 网络中的 C-BGF进行配置 IMS连接的处理；
步骤 S30， 该 SPDF在配置 IMS连接处理成功后， 向发起方归属网 络中的 A-RACF 发送承载有当前媒体流地址信息的接纳请求 ( Admission-Request ) 消息；
步驟 S40, 该 A-RACF 根据接收的承载当前媒体流地址信息的 Admission-Request消息， 对相应媒体流进行资源接纳控制处理。
其中在上述步骤 S20中， SPDF在对 C- BGF进行配置 IMS连接的处 理过程中， 可能还会要求 C- BGF对媒体流进行网络地址和 /或端口号转 换绑定处理， 其中：
1 )若 SPDF在对 C-BGF进行配置 IMS连接的处理时， 同时要求 C-BGF对媒体流进行 NA(P)T绑定处理， 则在上述步驟 S30中 SPDF向 A-RACF发送的 Admission-Request 消息中承载的当前媒体流地址信息 为： C-BGF 在对媒体流进行 NA(P)T 绑定处理后， 向 SPDF 反馈的 NA(P)T绑定处理后的媒体流地址信息。
2 )若 SPDF在对 C-BGF进行配置 IMS连接的处理时，未要求 C-BGF 对媒体流进行 NA(P)T绑定处理，则在上述步骤 S30中 SPDF向 A-RACF 发送的 Admission-Request 消息中承载的当前媒体流地址信息将由下述 过程确定：
a. 终结方用户向 P-CSCF反馈的 Offer Response消息中承载有由终 结方用户为媒体流分配的媒体流地址信息；
b. P-CSCF将接收的 Offei' Response消息中承载的媒体流地址信息承 载在认证授权请求（ AAR-Request ) 消息中发送给 SPDF;
c. SPDF将接收的 AAR- Request消息中承载的媒体流地址信息作为 要承载在 Admission-Request消息中的当前媒体流地址信息。
请参照图 6,该图是实施本发明提出的应用在 FO处理流程中的资源 接纳控制处理方法后的第一实施例处理过程示意图， 其具体的实施过程 如下：
601、发起方 UE向发起方归属网络中的 P-CSCF发送带有 SDP Offer 的 SIP Invite请求；其中发起方 UE发送的 SIP Invite请求中所携带的 SDP Offer可以用于表示一个多媒体会话中的一个或多个媒体；
602 ~ 606、 P-CSCF接收到发起方 UE发来的 SIP Invite请求后， 触 发发起方归属网络中的 SPDF对 C-BGF进行预留 IMS连接的处理； 可 选的， SPDF可能还会要求 C- BGF进行 NA(P)T绑定处理；
607、 P-CSCF 根据从注册流程中记录的该发起方 UE 的下一跳 CSCF,将发起方 UE发来的携带有 SDP Offer的 SIP Invite请求转发给对 应的 S-CSCF;
608、 S-CSCF接收到携带有 SDP Offer的 SIP Invite请求后， 进行确 认业务简 4艮处理， 同时 S- CSCF调用该发起方用户所需要的任何发起业 务逻辑， 包括基于用户多媒体业务契约进行所请求的 SDP授权；
609、 S-CSCF转发携带有 SDP Offer的 SIP Invite请求到终结方 UE;
610、 终结方 UE返回的提议响应 Offer Response将沿着原信令路径 返回给发起方归属网络中的 S-CSCF; 其中反馈的 Offer Response消息中 承载有终结方 UE为媒体流分配的有效媒体流地址信息；
611、 S-CSCF转发接收到的提议响应 Offer Response消息给 P-CSCF; 该转发的 Offer Response消息中承载有 S- CSCF获得的有效媒体流地址信 息；
612、 P-CSCF接收到提议响应 Offer Response消息后， 向 SPDF发 送认证授权请求消息； 该发送的 AAR-Request消息中承载有 P-CSCF获 得的有效的媒体流地址信息；
613 ~ 615、 SPDF接收到 AAR- Request消息后， 对 C-BGF进行配置 IMS连接的处理； 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定 处理；
616、 如果上述过程中 SPDF未要求 C-BGF进行 NA(P)T绑定处理， 则 SPDF 在配置 IMS 连接处理成功后， 向 A-RACF 发送接纳请求 Admission-Request 消息, 该发送的 Admission-Request 消息中承载有 SPDF在上述步驟 12中获得的有效的媒体流地址信息；
如果上述过程中 SPDF要求 C- BGF进行 NA(P)T绑定处理， C-BGF 按照要求进行了 NA(P)T绑定处理， 会在步骤 15中将 NA(P)T绑定处理 后的媒体流地址信息承载在配置 IMS连接（ Configure IMS Connection ) 消息中反馈给 SPDF; SPDF在配置 IMS 连接处理成功后， 并在获得 NA(P)T绑定处理后的有效媒体流地址的情况下， 再向 A-RACF发送接 纳请求 ( Admission-Request )消息， 该发送的 Admission-Request消息中 承载有 SPDF获得的有效的媒体流地址信息；
617、 A-RACF根据接收到的 Admission-Request消息中承载的包含 媒体流地址信息在内的媒体流信息对相应媒体流进行资源接纳控制处 理；
618、 A-RACF在对媒体流进行资源接纳控制处理成功后， 向 SPDF 反馈接纳响应 Admission-Response消息；
619、 SPDF接收到 A-RACF反馈的 Admission-Response消息后， 向 P-CSCF反馈认证授权响应 （ AAR- Answer ) 消息； 620、 P-CSCF接收到 SPDF反馈的 AAR-Answer消息后， 将在上述 步"^ 11中接丈到的提议响应 Offer Response消息反馈给发起方 UE。
请参照图 7，该图是本发明提出的应用在 FT处理流程中的资源接纳 控制处理方法的主要实现原理流程图； 其主要实现过程如下：
步骤 S100, 由终结方归属网络中的 P-CSCF确定当前媒体流地址信 台 - 其中终结方归属网络中的 P-CSCF确定当前媒体流地址信息的确定 过程具体如下：
A. 终结方用户向终结方归属网络中的 P- CSCF反馈承载有该终结方 用户为媒体流分配的媒体流地址信息的响应消息； 其中终结方用户向终 结方归属网络中的 P-CSCF反馈的响应消息可以但不限于为提议响应 Offer Response消息 , 或确认（ 200 OK ) 消息。
B. 该 P-CSCF确认接收的响应消息中承载的媒体流地址信息承载为 当前媒体流地址信息。
步骤 S200 , P-CSCF触发 SPDF请求 A-RACF根据包含当前媒体流 地址信息在内的媒体流信息， 对相应媒体流进行资源接纳控制处理。
P-CSCF 将确定的当前媒体流地址信息承载在认证授权请求 AAR-Request消息中发送给终结方归属网络中的 SPDF。
该 SPDF将接收的 AAR- Request消息中承载的媒体流地址信息承载 在接纳请求 Admission-Response 消息中发送给终结方归属网络中的 A-RACF。
A-RACF 根据接收到的承载上述确定的当前媒体流地址信息的 Admission-Response消息， 对相应媒体流进行资源接纳控制处理。
其中在上述步驟 S200中该 A-RACF对媒体流进行资源接纳控制处 理之前还要进行如下处理过程：
终结方归属网络中的 P- CSCF触发终结方归属网絡中的 SPDF对终 结方归属网络中的 C-BGF进行配置 IMS连接的处理。
或者在上述步骤 S200中该 A-RACF对媒体流进行资源接纳控制处 理的过程之后还要进行如下处理过程： 设置终结方归属网络中的 P-CSCF触发 SPDF对 C-BGF进行配置 IMS连接的处理。
当然， 终结方归属网络中的 P- CSCF触发 SPDF对 C-BGF进行配置 IMS连接的处理的过程也可以和上述步骤 S200中该 A-RACF对媒体流 进行资源接纳控制处理的过程同时进行。
请参照图 8,该图是实施本发明提出的应用在 FT处理流程中的资源 接纳控制处理方法后的第一实施例处理过程示意图， 其具体的实施过程 如下：
801、发起方 UE发送的包含 SDP Offer的 SIP Invite请求被转发到终 结方 UE的 S-CSCF上；
802、 8 8。？接收到携带有80? (^&1-的 81? 111¥^请求后， 进行确 认业务简报处理， 同时 S-CSCF调用该终结方用户所需要的任何发起业 务逻辑， 包括基于用户多媒体业务契约进行所请求的 SDP授权；
803、 S-CSCF将接收到的携带有 SDP Offer的 SIP Invite请求转发给 终结方用户归属网络中的 P-CSCF;
804 ~ 808、 P-CSCF接收到携带有 SDP Offer的 SIP Invite请求后， 触发终结方归属网絡中的 SPDF对 C- BGF进行预留 IMS连接的处理；
809、 P-CSCF在上述过程中的预留 IMS连接处理成功后， 将在上述 步骤 3中接收到的携带有 SDP Offer的 SIP Invite请求转发给终结方 UE;
810、 终结方 UE反馈 Offer Response消息给 P-CSCF, 其中反馈的
Offer Response消息中承载有终结方 UE为媒体流分配的有效媒体流地址 信息；
811、 P-CSCF 接收到 Offer Response 消息后， 向 SPDF 发送 AAR-Request消息； 该发送的 AAR-Request消息中承载有 P-CSCF获得 的有效的媒体流地址信息；
812 ~ 814、 SPDF接收到 AAR- Request消息后， 对 C-BGF进行配置 IMS连接的处理； 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定 处理；
815、 SPDF 在配置 IMS 连接处理成功后， 向 A-RACF 发送 Admission-Request 消息， 该发送的 Admission-Request 消息中承载有 SPDF在上述步骤 811中获得的有效的媒体流地址信息;
816、 A-RACF根据接收到的 Admission-Request消息中承载的包含 媒体流地址信息在内的媒体流信息对相应媒体流进行资源接纳控制处 理；
817、 A-RACF在对媒体流进行资源接纳控制处理成功后， 向 SPDF 反馈 Admission- Response消息；
818、 SPDF接收到 A-RACF反馈的 Admission-Response消息后， 向 P-CSCF反馈 AAR-Answer消息；
819、 P-CSCF接收到 SPDF反馈的 AAR-Answer消息后， 将在上述 步骤 10中接收到的由终结方 UE反馈的 Offer Response消息反馈给终结 方归属网络中的 S-CSCF;
820、 终结方归属网络中的 S-CSCF 将接收到的提议响应 Offer
Response消息转发给发起方归属网络中的 S- CSCF。
请参照图 9,该图是实施本发明提出的应用在 FT处理流程中的资源 接纳控制处理方法后的第二实施例处理过程示意图， 其具体的实施过程 如下：
该图 9中的步驟 901 ~ 911 同图 8中的步骤 801 ~ 811 , 这里不再赘 述；
912、 SPDF 向 A-RACF 发送 Admission-Request 消息， 该发送的
Admission-Request消息中承载有 SPDF在上述步骤 911中获得的有效的 媒体流地址信息；
913 、 A-RACF 根据接收到 的承载媒体流地址信息的
Admission-Request消息对相应媒体流进行资源接纳控制处理；
914、 A-RACF在对媒体流进行资源接纳控制处理成功后， 向 SPDF 反馈 Admission-Response消息；
915 ~ 917、 SPDF在接收到 A- RACF反馈的 Admission-Response消 息后， 对 C-BGF进行配置 IMS连接的处理； 可选地， SPDF可能还要求
C-BGF进行 A(P)T绑定处理； 918、 SPDF 在配置 IMS 连接处理成功后， 向 P-CSCF 反馈 AAR- Answer消息
919、 P-CSCF接收到 SPDF反馈的 AAR-Answei'消息后， 将在上述 步驟 10中接收到的由终结方 UE反馈的提议响应 Offer Response消息反 馈给终结方归属网络中的 S-CSCF;
920、 终结方归属网络中的 S-CSCF 将接收到的提议响应 Offer Response消息转发给发起方归属网络中的 S-CSCF。
请参照图 10， 该图是实施本发明提出的应用在 FT处理流程中的资 源接纳控制处理方法后的第三实施例处理过程示意图， 其具体的实施过 程如下：
图 10中的步骤 1001 - 1009同图 8中的步骤 801 ~ 809, 这里不再赘 述；
1010、 终结方 UE反馈确认（200 OK ) 消息给终结方归属网络中的 P-CSCF, 其中反馈的 200 OK消息中承载有终结方 UE为媒体流分配的 有效媒体流地址信息（其中，本领域的技术人员理解， 步骤 1009和 1010 之间还可以存在一些处理步骤， 此不资述）；
1011、 P-CSCF接收到 200 O 消息后 , 向 SPDF发送 AAR-Request 消息； 该发送的 AAR-Request消息中承载有 P-CSCF获得的有效的媒体 流地址信息；
1012、 SPDF向 A-RACF发送 Admission-Request消息， 该发送的
Admission-Request消息中承载有 SPDF在上述步骤 1011中获得的有效的 媒体流地址信息；
1013、 A-RACF根据接收到的 Admission-Request消息中承载的包含 媒体流地址信息在内的媒体流信息对相应媒体流进行资源接纳控制处 理；
1014、 A-RACF在对媒体流进行资源接纳控制处理成功后，向 SPDF 反馈 Admission-Response消息；
1015 ~ 1017、 SPDF在接收到 A- RACF反馈的 Admission-Response 消息后， 对 C-BGF进行配置 IMS连接的处理及打开门控（ Open Gates ) 处理； 可选地， SPDF可能还要求 C-BGF进行 NA(P)T绑定处理；
1018、 SPDF在配置 IMS连接处理和 Open Gates处理都成功后， 向 P-CSCF反馈 AAR-Answer消息；
1019、 P- CSCF接收到 SPDF反馈的 AAR-Answer消息后，将在上述 步骤 10中接收到的由终结方 UE反馈的确认 200 OK消息反馈给终结方 归属网络中的 S-CSCF;
1020、终结方归属网络中的 S- CSCF将接收到的确认 200 OK消息转 发给发起方归属网络中的 S- CSCF。
注： 其中上图 10中的 1015 ~ 1017步骤中的配置 IMS连接处理及打 开门控（Open Gates )处理也可以发生在步骤 1012之前， 也可以和步骤 1012 - 1014步骤中的处理过程同时进行， 这里不再详细赘述。
本发明的实施例的基于业务的策略决定功能实体包括：
配置连接消息接收单元， 用于从 C-BGF接收配置 IMS连接消息； 当前媒体流地址信息获取单元， 用于从获取所述配置 IMS连接消息 中承载的 NA(P)T绑定处理后的当前媒体流地址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
此外，本发明基于业务的策略决定功能实体的另一实施例中， 包括： 认证授权请求消息接收单元， 用于从 P-CSCF接收认证授权请求消 息；
当前媒体流地址信息获取单元， 用于从所述认证授权请求消息中获 取其承载的由终结方用户为媒体流分配的媒体流地址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
本发明实施例的代理呼叫会话控制功能实体 P-CSCF包括： 当前媒体流地址信息确定单元， 用于将终结方用户反馈的响应消息 中承载的由该终结方用户为媒体流分配的媒体流地址信息确定为当前媒 体流地址信息；
资源接纳控制处理触发单元， 用于在所述当前媒体流地址信息确定 单元确定当前媒体流地址信息后， 通过 SPDF触发 A-RACF进行资源接 纳控制处理。
需要说明的是， 上述各功能实体中的单元均是逻辑上的实体， 在具 体的物理实现上， 可以釆用多种不同的方式来进行组合和集成， 此不赘 述。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱 离本发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发 明权利要求及其等同技术的范围之内， 则本发明也意图包含这些改动和 变型在内。

Claims

权 利 要 求
1、 一种资源接纳控制处理方法， 其特征在于， 包括：
基于业务的策略决定功能实体 SPDF在对发起方归属网络中的核心 网边界网关功能实体 C-BGF配置 IP多媒体子系统 IMS连接的处理成功 后， 向发起方归属网络中的接入网资源接纳控制功能实体 A-RACF发送 承载有当前媒体流地址信息的接纳请求消息；
所述 A-RACF根据接收的接纳请求消息对相应媒体流进行资源接纳 控制处理。
2、 如权利要求 1所述的方法， 其特征在于， 还包括：
所述 SPDF在对 C- BGF进行配置 IMS连接的处理时，需所述 C-BGF 对媒体流进行网絡地址和 /或端口号转换 NA(P)T绑定处理。
3、 如权利要求 2所述的方法， 其特征在于， 所述承载有当前媒体流 地址信息的接纳请求消息中， 该当前媒体流地址信息为：
C-BGF向所述 SPDF反馈对媒体流进行 NA(P)T绑定处理后的媒体 流地址信息。
4、 如权利要求 1至 3任意一项所述的方法， 其特征在于， 在所述 SPDF在对 C- BGF进行配置 IMS连接的处理之前， 还包括：
发起方归属网络中的代理呼叫会话控制功能实体 P-CSCF接收到终 结方用户反馈的提议响应消息后， 触发发起方归属网络中的 SPDF对发 起方归属网络中的 C-BGF进行配置 IMS连接的处理。
5、 如权利要求 4所述的方法， 其特征在于， 所述承载有当前媒体流 地址信息的接纳请求消息中， 该当前媒体流地址信息为：
由终结方用户为媒体流分配的媒体流地址信息。
6、 如权利要求 5所述的方法， 其特征在于， 所述 P-CSCF接收到的 终结方用户反馈的提议响应消息中承载有所述由终结方用户为媒体流分 配的媒体流地址信息；
在所述 SPDF向 A- RACF发送承载有当前媒体流地址信息的接纳请 求消息之前， 还包括：
所述 P-CSCF将媒体流地址信息承载在认证授权请求消息中发送给 所述 SPDF;所述 SPDF将该媒体流地址信息作为要承载在接纳请求消息 中的当前媒体流地址信息。
7、 一种资源接纳控制处理方法， 其特征在于， 包括：
终结方归属网络中的代理呼叫会话控制功能实体 P-CSCF在确定当 前媒体流地址信息后， 触发终结方归属网络中的基于业务的策略决定功 能实体 SPDF 向终结方归属网络中的接入网资源接纳控制功能实体
A-RACF发送承载有当前媒体流地址信息的接纳请求消息；
所述 A-RACF根据接收的接纳请求消息， 对相应媒体流进行资源接 纳控制处理。
8、 如权利要求 7所述的方法， 其特征在于， 所述 P- CSCF确定当前 媒体流地址信息的过程包括：
终结方用户向终结方归属网络中的 P-CSCF反馈承载有该终结方用 户为媒体流分配的媒体流地址信息的响应消息；
所述 P-CSCF将接收的响应消息中承载的媒体流地址信息确定为当 前媒体流地址信息。
9、 如权利要求 8所述的方法， 其特征在于， 所述终结方用户向所述 P-CSCF反馈的响应消息为：
提议响应 Offer Response消息； 或
确认 200 OK消息。
10、 如权利要求 8所述的方法， 其特征在于， 所述的触发 SPDF向
A-RACF发送承载有当前媒体流地址信息的接纳请求消息， 包括： 所述 P-CSCF将确定的当前媒体流地址信息承载在认证授权请求消 息中发送给终结方归属网络中的 SPDF;
所述 SPDF将接收的认证授权请求消息中承载的媒体流地址信息承 载在接纳请求消息中发送给所述 A- RACF。
11、 如权利要求 7至 10任一项所述的方法， 其特征在于， 在所述 A-RACF对媒体流进行资源接纳控制处理之前、 之后或同时， 还包括： 终结方归属网络中 P-CSCF触发终结方归属网络中的 SPDF对终结 方归属网络中的核心网边界网关功能 C- BGF进行配置 IP多媒体子系统 IMS连接的处理。
12、 一种基于业务的策略决定功能实体， 其特征在于， 包括： 配置连接消息接收单元，用于从核心网边界网关功能实体 C-BGF接 收配置 IP多媒体子系统 IMS连接消息；
当前媒体流地址信息获取单元，用于从获取所述配置 IMS连接消息 中承载的网络地址和 /或端口号转换 NA(P)T绑定处理后的当前媒体流地 址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
13、 一种基于业务的策略决定功能实体， 其特征在于， 包括： 认证授权请求消息接收单元， 用于从代理呼叫会话控制功能实体 P-CSCF接收认证授权请求消息；
当前媒体流地址信息获取单元， 用于从所述认证授权请求消息中获 取其承载的由终结方用户为媒体流分配的媒体流地址信息；
接纳请求消息构造单元， 用于将所述当前媒体流地址信息承载在接 纳请求消息中。
14、 一种代理呼叫会话控制功能实体， 其特征在于， 包括： 当前媒体流地址信息确定单元， 用于将终结方用户反馈的响应消息 中承载的由该终结方用户为媒体流分配的媒体流地址信息确定为当前媒 体流地址信息；
资源接纳控制处理触发单元， 用于在所述当前媒体流地址信息确定 单元确定当前媒体流地址信息后， 通过基于业务的策略决定功能实体
SPDF触发接入网资源接纳控制功能实体 A-RACF进行资源接纳控制处 理。
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