WO2007003136A1 - Procede d'allocation de l'adresse de traduction de passerelle multimedia et procede de transfert de la passerelle - Google Patents

Procede d'allocation de l'adresse de traduction de passerelle multimedia et procede de transfert de la passerelle Download PDF

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Publication number
WO2007003136A1
WO2007003136A1 PCT/CN2006/001554 CN2006001554W WO2007003136A1 WO 2007003136 A1 WO2007003136 A1 WO 2007003136A1 CN 2006001554 W CN2006001554 W CN 2006001554W WO 2007003136 A1 WO2007003136 A1 WO 2007003136A1
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WIPO (PCT)
Prior art keywords
media stream
bgf
session
address
spdf
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PCT/CN2006/001554
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English (en)
Chinese (zh)
Inventor
Jun Yan
Ying Wang
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007003136A1 publication Critical patent/WO2007003136A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • 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]

Definitions

  • the present invention relates to the field of media stream interaction technologies, and in particular, to a media stream conversion address allocation method and a media stream forwarding method thereof.
  • Background technique
  • NA(P)T Network Address (Port) Translation
  • the network domain (such as China Mobile Network and China Telecom Network belong to two different network domains) may occupy different address domains, so the media stream communication between two different network domains also needs NA ( P)T conversion, these NA(P)T devices capable of supporting the NA(P)T conversion function save a large amount of IP address resources for the existing communication system, so that various data services can be normally carried out.
  • the prior art proposes a technical solution to solve the above problem, so that the media stream exchanged between the calling party and the called party can interact through different address domains, and this solution is currently called NA(P)T traversing technology.
  • the mainstream NA(P)T traversal technology is implemented by using an application layer gateway (ALG), such as ALG processing of media stream packets by an application function (AF, Application Function) of the signaling plane. And control the device with the NA(P)T function on the bearer plane (such as the border gateway function BGF, Border Gateway Function) to complete the media stream forwarding, thereby implementing NA(P)T traversal.
  • ALG application layer gateway
  • the packet grid architecture in the Institute's Telecommunications and Internet Converged Services and Protocols for Advanced Networking introduces a resource admission control subsystem (RACS, Resource Admission Control) between the application layer and the transport layer.
  • RACS Resource Admission Control
  • Sub-system for uniformly managing resources of the bearer network, and providing control based on policies (including bandwidth allocation policies, priority policies, sufficient bandwidth policies, and whether to allow call policies, etc.), wherein the quality of service of the bearer network ( QoS, Quantity of Service and NA(P)T are both accessed by RACS and controlled by RACS.
  • the RACS architecture defined by TISPAN is shown in Figure 1, where:
  • the resource admission control subsystem RACS mainly includes a service-based policy decision function (SPDF), and a core network border gateway function (C-BGF, Core Border Gateway Function). 3.
  • SPDF service-based policy decision function
  • C-BGF Core Border Gateway Function
  • A-RACF Access-Resource and Admission Control Function
  • RCEF Resource Control Enforcement Function
  • the other parts of the figure describe the relationship and interface between the relevant functional entities and the RACS architecture, where NA (P)T control function is mainly implemented by the signaling interaction process between AF 1, SPDF 2 and C-BGF 3 entities.
  • Others such as A-RACF 4 entity and RCEF 5 entity are mainly used for access layer QoS.
  • the control of resources has little to do with the implementation of NA(P)T.
  • Generating a media stream forwarding entry between the calling party and the called party based on signaling interaction between the AF 1, SPDF 2, and C-BGF 3 entities in the resource admission control subsystem RACS, and based on the generated media stream forwarding table
  • the item forwards the session media stream that interacts between the calling party and the called party.
  • the AF receives a session establishment message, where the caller media message information is included;
  • the AF sends a ⁇ ( ⁇ ) ⁇ conversion request message to the SPDF;
  • the SPDF responds to the received NA(P)T conversion request, and allocates bearer network address resource information (such as IP address and/or port number) to the calling media stream, and allocates the calling session media stream.
  • bearer network address resource information such as IP address and/or port number
  • the IP address and/or port number is fed back to the AF; 4.
  • the AF modifies the media address of the calling session media stream to an IP address and/or port number assigned by the SPDF to the session media stream.
  • the AF receives a session establishment message, where the called user includes the tongue media stream information.
  • the AF sends a NA (P) T conversion request message to the SPDF;
  • the SPDF responds to the received NA(P)T conversion request, allocates bearer network address resource information (such as IP address and/or port number, etc.) for the called session media stream, and assigns an IP to the called session media stream.
  • bearer network address resource information such as IP address and/or port number, etc.
  • the AF modifies the media address of the called session media stream to SPDF as the IP address and/or port number assigned to the called session media stream;
  • SPDF establishes a mapping relationship between the IP address and/or port number assigned to the calling session media stream and the IP address and/or port number assigned to the called session media stream, thereby generating a response process corresponding to the calling party and the called party.
  • Media stream forwarding entry
  • FIG. 3 is a schematic diagram of a process for forwarding a media stream of a called party session based on a generated media stream forwarding entry.
  • the process of forwarding the media stream is as follows:
  • the AF After the AF establishes a session connection between the calling party and the called party, the AF sends a session establishment success indication command to the SPDF.
  • the generated media stream forwarding entry is sent to the C-BGF;
  • the C-BGF stores the media stream forwarding entry sent by the SPDF. According to the media stream forwarding entry, the IP address or port number of the media stream sent during the interaction between the calling and the called session is converted, and the conversion process is performed. After the media stream forwarding;
  • the AF After the end of the session interaction process between the calling and the called party, the AF sends a session end indication command to the SPDF.
  • the SPDF After receiving the session end indication command sent by the AF, the SPDF releases the bearer network IP address or port number allocated for the main called media stream;
  • the SPDF sends a command to delete the media stream forwarding entry to the C-BGF.
  • the C-BGF After receiving the command to delete the media stream forwarding entry sent by the SPDF, the C-BGF stores the command. The media stream forwarding entry corresponding to the primary and called session interactions is deleted.
  • the T-transform request respectively, assigns an IP address or a port number to the primary called session media stream, and establishes a mapping relationship between the IP address or the port number assigned to the primary called session media stream, and generates a media stream forwarding entry corresponding to the calling and called session. Then, according to the generated media stream forwarding entry, the media stream in the process of the interaction between the calling and the called session is forwarded.
  • the method for implementing the NA(P)T conversion processing of the media stream has the following defects: 1.
  • SPDF is used to complete the
  • the policy decision function of the service is to shield the bearer network from the service layer, and determine the resource application and processing policy for the bearer network according to the request of the service layer and the resource condition of the bearer network, that is, the function of the processing policy is essentially provided, and The specific bearer network resources are managed and controlled. Based on this, the control and management functions of the primary and called session media stream NA(P)T are implemented on the SPDF. It is not appropriate.
  • each C-BGF also reports some specific address information to SPDF (or configured on SPDF) to prevent SPDF from assigning these specific address information to the media stream in a session, resulting in an address.
  • SPDF or configured on SPDF
  • the calling media stream or the called media stream may carry multiple types of media streams at the same time, such as including audio streams, video streams, and the like, so that AF needs to be separately different.
  • Type media streams apply for media address information (such as IP address or port number, etc.), and the number of media stream types is before the calling and receiving parties notify each other of the type of media stream they contain. Undetermined, therefore AF needs to maintain the information of the calling media stream and the called media stream to correctly match multiple media streams between the calling and the called, and the information can be naturally exported to the media stream forwarding table.
  • the technical problem to be solved by the present invention is to provide a media stream conversion address allocation method and a media stream forwarding method thereof, so as to make the function sharing between AF, SPDF and BGF more reasonable, reduce the workload of SPDF, and improve media stream address translation. Process stability.
  • a media stream conversion address allocation method includes the following steps:
  • the application function AF After receiving the session establishment message, the application function AF carries the session media stream attribute information contained in the session establishment message in the conversion address request message and sends the message to the service-based policy decision function SPDF.
  • the SPDF is configured to receive the conversion address request message.
  • the session media stream attribute information of the bearer is located, and the corresponding border gateway function BGF is located;
  • the BGF responds to the received translation address request message by assigning a translation address to the session media stream.
  • the session media stream attribute information is media stream address information included in the session establishment message.
  • the session media stream attribute information is the media stream address information included in the session establishment message and the network operator identifier where the sender of the session media stream is located.
  • the process of locating the corresponding BGF specifically includes the following steps:
  • the SPDF presets a positioning strategy
  • the SPDF obtains the corresponding network operator identifier according to the correspondence table of the media stream address information index received in the conversion address request message, and obtains the corresponding network operator identifier;
  • the SPDF locates the corresponding BGF in the determined BGF group according to the media stream address information and the positioning policy carried in the converted address request message.
  • the process of locating the corresponding BGF specifically includes the following steps:
  • the SPDF presets a positioning strategy
  • the SPDF obtains a corresponding BGF group according to the correspondence table of the media stream address information index received in the conversion address request message, and obtains a corresponding BGF group;
  • the process of locating the corresponding BGF specifically includes the following steps:
  • the SPDF presets a positioning strategy
  • the SPDF locates the corresponding BGF in the determined BGF group according to the media stream address information and the positioning policy carried in the converted address request message.
  • the method further includes the steps of:
  • the BGF is configured to receive the pre-requested address domain information carried in the conversion address request message,
  • the session 4 is allocated a corresponding address in the address field.
  • the session media stream attribute information further includes a transmission direction identifier ⁇ 3 ⁇ 4 for identifying a direction of the session media stream.
  • the method also includes the steps of:
  • the BGF allocates a translation address in the corresponding address domain to the session media stream according to the pre-requested address domain information carried in the received conversion address request message.
  • the session media stream attribute information further includes a session identifier for identifying the session.
  • the method also includes the steps of:
  • the SPDF establishes a correspondence table between the storage session identifier and the location BGF; and when the SPDF receives the translation address request message for the same session, the SPDF is configured according to the session media stream attribute information carried in the message according to the conversion address request message.
  • the included session identifier is indexed to the corresponding relationship table, and the corresponding positioning BGF is obtained.
  • the method also includes the steps of:
  • the located BGF establishes a correspondence table between the storage session identifier and the translation address; when the subsequently located BGF receives the translation address request message for the same session, the session media stream carried in the message according to the translation address request message
  • the session identifier included in the attribute information is indexed to the corresponding relationship table, and the corresponding translation address is obtained.
  • the media stream address information is an IP address; or an IP address and a port number.
  • the positioning strategy is to randomly select a BGF as a strategy for locating BGF in a BGF group consisting of multiple BGFs;
  • the remaining address resource is greater than the predetermined threshold.
  • BGF as a strategy for locating BGF
  • a BGF with a CPU idle resource greater than a predetermined threshold is selected as a strategy for locating the BGF in a BGF group consisting of multiple BGFs.
  • the network operator identifier is an access network operator identifier or a trademark identifier for a backbone network.
  • the translation address is a conversion IP address and/or a conversion port number.
  • the present invention also provides a media stream forwarding method, including the steps:
  • the AF establishes a correspondence between the primary and the called session media stream conversion addresses according to the converted address information allocated by the BGF to the called session media stream, and generates a media stream forwarding entry corresponding to the calling and called session process;
  • the session establishment success indication command and the media stream forwarding entry are sent to the BGF;
  • the BGF forwards the media stream in the process of the interaction between the primary and the called session according to the received media stream forwarding entry.
  • the method further includes the step of the BGF feeding back the translated address information respectively assigned to the called called session media stream to the AF through the SPDF.
  • the AF sends the session establishment success indication command and the media stream forwarding entry to the BGF through the SPDF.
  • the method further includes the step of the BGF storing the received media stream forwarding entry.
  • the method also includes the steps of:
  • the AF sends a session end indication command to the BGF after the end of the calling and called session interaction process
  • the BGF After receiving the session end indication command, the BGF deletes the stored media stream forwarding entry, and releases the translation address information occupied by the media stream forwarding entry.
  • the AF sends a session end indication command to the BGF through the SPDF.
  • the converted address information is a converted IP address or a converted port number.
  • the present invention also provides a media stream forwarding method, including the steps:
  • the BGF establishes a main quilt according to the converted address information allocated to the main called session media stream. Calling the correspondence between the session media stream conversion addresses, and generating a media stream forwarding entry corresponding to the calling and called session process;
  • the media stream in the process of the interaction between the main and the called session is forwarded according to the established media stream forwarding entry.
  • the AF forwards the session establishment success indication command to the BGF through the SPDF.
  • the method further includes the step of the BGF storing the established media stream forwarding entry.
  • the method also includes the steps of:
  • the AF sends a session end indication command to the BGF after the end of the calling and called session interaction process
  • the BGF After receiving the session end indication command, the BGF deletes the stored media stream forwarding entry, and releases the translation address information occupied by the media stream forwarding entry.
  • the AF forwards a session end indication command to the BGF through the SPDF.
  • the beneficial effects that the present invention can achieve are as follows:
  • the media stream conversion address allocation method of the present invention is sent to the SPDF by encapsulating the attribute information of the session media stream in the conversion address request message by the A, so that the SPDF can locate the corresponding BGF according to the session media stream attribute information encapsulated by the receiving conversion address request message. And forwarding the conversion address request information to the located BGF, and the BGF allocates the translation address information to the session media stream, thereby implementing the policy control of the SPDF only by converting the address resource (such as the IP address and/or the port number).
  • the address resource such as the IP address and/or the port number
  • the corresponding BGF actually performs the translation address resource control and allocation processing on the session media stream, thereby alleviating the work load of SPDF to realize the control and management of the session media stream conversion address resource, and the BGF itself allocates and manages its own work. Resources, simple management, even if a BGF resource pool is wrong, it will not affect the entire network.
  • the media stream forwarding method of the present invention allocates a translation address resource to the corresponding called session media stream by the corresponding BGF, respectively, and the AF or BGF itself generates a corresponding media stream forwarding entry according to the converted content information of the primary and the called media stream.
  • the SPDF is only responsible for determining the NA(P)T related policy according to the request information of the service layer AF and the configuration information of the bearer network BGF, and subsequent in the session interaction process, The AF sends the generated forwarding entry to the BGF. If the forwarding entry is generated by the BGF, the AF sends the media stream forwarding entry to the BGF.
  • the BGF forwards the media in the process of the interaction between the calling and the called according to the media forwarding entry. The flow is forwarded; thus, the workload of generating the forwarding entry by the SPDF is avoided, and the workload of the SPDF for controlling and managing the address resource of the session media stream is reduced, and the stability of the entire system is improved.
  • Figure 1 is a schematic diagram showing the structure of a RACS architecture defined by TISPAN;
  • FIG. 2 is a schematic diagram of a process of generating a media stream forwarding entry between an existing primary and a called party;
  • FIG. 3 is a schematic diagram of a process for forwarding a media stream of a called party and a session according to a generated media stream forwarding entry;
  • FIG. 4 is a schematic diagram of a main implementation principle of a media stream conversion address allocation method according to the present invention
  • FIG. 5 is a schematic diagram of a specific implementation principle of a media stream forwarding method according to the present invention. Address, schematic diagram of the specific implementation process of forwarding the primary and secondary called interactive media streams. detailed description
  • the design idea of the media stream conversion address allocation method of the present invention is to control the allocation strategy of the media stream conversion address by the SPDF in the RACS architecture, and the SPDF selects the corresponding BGF to allocate the translation address information to the media stream according to the policy control result, so as to alleviate SPDF allocates the work load of the conversion address to the media stream;
  • the design idea of the media stream forwarding method of the present invention is that the AF in the RACS architecture allocates the translated address information allocated to the main called session media stream according to the BGF, and establishes the corresponding calling and called session interaction.
  • the media stream forwarding entry of the process, or the BGF itself, according to the translated address information respectively allocated to the main called session media stream, to establish a media stream forwarding entry corresponding to the interaction process of the primary and the called session, so as to alleviate the work of the SPDF to establish the media stream forwarding entry. Burden; thus making the function allocation of AF/SPDF/BGF in the RACS architecture more reasonable.
  • FIG. 4 is a schematic diagram of the main implementation principle of the media stream conversion address allocation method of the present invention.
  • the specific implementation principle is as follows:
  • Step S1 the application function AF receives a session establishment message including media stream description information (media flow information that can be called party, or media stream information of the called party);
  • media stream description information media flow information that can be called party, or media stream information of the called party
  • Step S2 The AF sends a conversion address request message carrying the received session media stream attribute information to the service-based policy determining function SPDF;
  • the media stream attribute information carried in the translation address request message sent by the AF to the SPDF may include the media stream address information of the user (including the IP address information of the media stream, or the media) in the media stream description information carried in the session message.
  • the user can be in the access network, and the network operator identifier here is the access network operator identifier.
  • the sender user who sends the message to establish the message can also be in the backbone network, and the network operator identifier here is Named for the backbone network operator.
  • Step S3 the SPDF locates the corresponding border gateway function BGF according to the session media stream attribute information carried in the conversion address request message sent by the AF;
  • the session media stream attribute information carried in the conversion address request message sent by the AF is the media stream address information of the user in the media stream description information carried in the session message (that is, the IP address information of the media stream; or a certain body stream)
  • the SPDF presets a correspondence table between the media stream address segment (ie, the media stream IP address segment) and the network operator identifier;
  • the SPDF according to the media stream address information (ie, media stream IP address information; or media stream IP address and port number information, etc.) carried in the conversion address request message sent by the AF, is preset in the media stream. Corresponding relationship table between the address segment and the network operator, thereby obtaining the corresponding network operator identifier; 4) The SPDF determines the BGF group in the network where the sender of the session media stream is located according to the network operator identifier obtained above. (Because multiple BGFs are simultaneously set in the same access network or in the same backbone network, the BGF group is formed.
  • the media stream address information ie, media stream IP address information; or media stream IP address and port number information, etc.
  • the SPDF obtains the identifier of the network operator where the sender of the session media stream is sent, the SPDF obtains the access network or the backbone network where the sender of the session media stream is located according to the obtained network operator identifier, thereby being able to determine a BGF group consisting of multiple BGFs included in the corresponding access network or corresponding to the backbone network;);
  • the SPDF further requests the media stream address information (ie, the media stream IP address information; or the media stream IP address and port number information, etc.) carried in the message according to the conversion address request sent by the AF, and the preset in the above 1)
  • the positioning strategy locates a corresponding BGF in the BGF group determined in the above 4).
  • the SPDF presets a correspondence table between the media stream address segment (ie, the media stream IP address segment) and the BGF group;
  • the SPDF according to the media stream address information (ie, media stream IP address information; or media stream IP address and port number information, etc.) carried in the conversion address request message sent by A, is preset in the media stream. a correspondence table between the address segment and the BGF group, thereby obtaining a corresponding BGF group;
  • the SPDF is further preset according to the media stream address information (ie, a certain stream IP address information; or the media stream IP address and port number information, etc.) carried in the conversion address request message sent by the AF and the above 11)
  • the positioning strategy locates a corresponding BGF in the BGF group determined in the above 13).
  • the session media stream attribute information carried in the translation address request message sent by the AF is the media stream address information of the user in the media stream description information carried in the session message (that is, the media stream IP address information; or the media stream IP address) And the port number information, etc.) and the identity of the network operator where the sender of the stream is located, the specific process of the BGF corresponding to the SPDF location can be as follows:
  • SPDF is based on the sender of the session media stream carried in the translation address request message sent by the AF The network operator identifier that is located to determine the BGF group in the network where the sender of the session media stream is located;
  • the SPDF locates a corresponding BGF in the BGF group determined in the above 22) according to the media stream address information carried in the conversion address request message sent by the AF and the positioning strategy preset in the above 11).
  • the BGF positioning strategy mentioned in the above 1), 11) or 21) can be, but is not limited to, one of the following BGF positioning strategies:
  • the BGF localization strategy is to randomly select a BGF from a BGF group consisting of multiple BGFs as a strategy for localizing BGF;
  • a BGF with a remaining address resource greater than a predetermined out-of-order value as a strategy for locating the BGF in a BGF group consisting of multiple BGFs, such as selecting a BGF with a remaining address resource greater than 50% and having the most remaining address resources in the BGF group.
  • a BGF with a CPU idle resource greater than a predetermined threshold as a strategy for locating the BGF in a BGF group consisting of multiple BGFs, for example, selecting a BGF with a CPU idle resource greater than 60% and the CPU being the most idle in the BGF group is used as the positioning BGF.
  • Step S4 the SPDF forwards the converted address request message sent by the AF to the BGF obtained in the above step S3;
  • Step S5 the BGF obtained by the positioning responds to the received translation address request message, and allocates translation address information (that is, address information used for forwarding the session media stream, including converting the IP address and/or the conversion port number, etc.) for the session media stream.
  • translation address information that is, address information used for forwarding the session media stream, including converting the IP address and/or the conversion port number, etc.
  • the SPDF may further determine the pre-application in the located BGF according to the media stream address information (ie, media stream IP address information; or media stream IP address and port number information, etc.) carried in the translation address request message sent by the AF.
  • the address domain resource ie, the IP address resource domain and/or the port resource domain pre-applied in the BGF determined above; in addition, the direction of the session media stream may be added in the translation address request message sent by the AF.
  • the transmission direction identification parameter such as using the UP parameter, indicates that the "media stream is sent from the user to the network, and the DOWN parameter indicates that the media stream is
  • the SPDF further sends the pre-applied address domain resource in the located BGF according to the media stream address information and the transmission direction identification parameter (UP/DOWN) carried in the translated address request message sent by the AF. That is, the IP address resource domain and/or the port resource domain pre-applied in the BGF determined above;
  • the SPDF then sends the pre-applied address domain information determined in the AF to the translated BGF sent by the AF.
  • the located BGF then allocates the translated address in the corresponding address field to the session media stream according to the pre-applied address domain information carried in the received translation address request message (that is, the BGF obtained by the positioning according to the SPDF)
  • the pre-applied address domain information carried in the message is used to select an IP address and/or port in the corresponding IP address domain and/or corresponding port domain as the translation address to be allocated to the session media stream;
  • the session media stream attribute information may further include a session identifier for identifying the session.
  • the SPDF may establish a correspondence table between the identifier of the session media stream and the location BGF.
  • the established correspondence may be indexed according to the session identifier included in the media stream attribute information carried in the conversion address request message. Table, the corresponding positioning BGF is obtained, thereby increasing the rate of locating BGF.
  • a mapping correspondence table between the translation address allocated for the session media stream and the session identifier of the session may be established;
  • the BGF can find the corresponding translation address according to the session identifier included in the session media stream attribute information carried in the conversion address request message, and the corresponding relationship table established by the index. , thereby increasing the allocation rate of the session media stream conversion address.
  • FIG. 5 is a schematic diagram of a specific implementation principle of the media stream forwarding method of the present invention.
  • the specific implementation principles are as follows:
  • Step S11 according to the media stream conversion address allocation method proposed by the present invention, the BGF respectively allocates corresponding translation address information to the called session media stream (which may be a conversion IP address or a rotation). Change the port number, etc.), and the BGF feeds back the converted address information respectively assigned to the called session media stream to the SPDF;
  • the called session media stream which may be a conversion IP address or a rotation. Change the port number, etc.
  • Step S12 the SPDF feeds back the converted address information that is respectively allocated by the BGF to the called session media stream, and then feeds back to the AF;
  • Step S13 The AF modifies the media address of the main called session media stream according to the converted address information allocated by the AF to the called session media stream respectively.
  • Step S14 At the same time, the AF establishes a correspondence relationship between the converted media addresses of the primary and the called session media streams according to the converted address information allocated by the received BGF to the called media stream, respectively, and generates a media corresponding to the process of the calling party and the called party. Flow forwarding entry.
  • Step S15 subsequently, after the primary and the called session is successfully established, the AF sends a session establishment success indication command to the SPDF, and sends the media stream forwarding entry established in the foregoing step S14 to the SPDF;
  • Step S16 the SPDF successfully establishes the received session. Instructing the command and the media stream forwarding entry to be forwarded to the BGF;
  • Step S17 The BGF stores the received media stream forwarding entry, and forwards the media stream in the process of the primary and the called party according to the received media stream forwarding entry.
  • Step S18 subsequent, the AF sends a session end indication command to the SPDF again after the end of the calling and called session interaction process;
  • Step S19 the SPDF forwards the received session end indication command to the BGF
  • Step S20 After receiving the session end indication command, the BGF deletes the media stream forwarding entry that is stored in the media stream forwarding entry, and releases the converted address resource occupied by the media stream forwarding entry. Establishing a correspondence between the calling and called session media stream conversion addresses, and generating a media stream forwarding entry corresponding to the calling and called session processes;
  • the AF sends a session establishment success indication command to the located BGF through the SPDF, and the located BGF receives the session establishment success indication command sent by the AF according to the established media flow. Publish items to the media stream during the interaction between the calling and called sessions Perform forwarding processing.
  • the BGF may further store the media stream forwarding entry established by the session and the called session, so that the AF sends a session end indication command to the located BGF through the SPDF, and the BGF receives the message. After the session end indication command, the converted address resource for the stored media is used to the resource pool.
  • FIG. 6 the figure is a conversion address configured for the session media stream of the called party.
  • a schematic diagram of a specific implementation process for forwarding the primary and secondary called interactive media streams, and the specific implementation process is as follows:
  • Step S100 The AF receives a session establishment message of the calling party.
  • Step S101 The AF triggers a conversion address request.
  • Step S102 The AF sends the media stream attribute information included in the session establishment message sent by the calling party to the SPDF in the converted address request message, where the AF sends the calling party session media stream carried in the conversion address request message sent by the AF to the SPDF.
  • the attribute information includes media stream address information (for the media stream IP address; or the media stream IP address or port number, etc.) and the network operator identifier of the calling party user (optional);
  • Step S103 The SPDF locates a corresponding BGF according to the media stream address information and the network operator identifier carried in the received conversion address request message, and determines the address domain resource information pre-applied in the located BGF; wherein the SPDF is based on The process of locating the specific BGF by the media stream address information and the network operator identifier carried in the received translation address request message, and determining the corresponding pre-application address domain resource in the located BGF has been elaborated in the above process, and is no longer here. Too many details.
  • step S104 the SPDF forwards the address translation request message sent by the AF to the located BGF, where the forwarded address request message carries the address domain resource information pre-applied in the BGF, step S105, and the located BGF is based on the BGF. Hosted in the translation address request message sent by SPDF The pre-applied address domain resource information, in the corresponding address domain resource, allocates a translation address information (conversion IP address and/or conversion port number, etc.) for the calling party session media stream;
  • Step S106 the located BGF feeds back an address request response message to the SPDF, and the converted address request response message carries the converted address information (converted IP address and/or conversion) allocated by the BGF to the calling party session media stream. Port number, etc.);
  • Step S107 the SPDF feeds back the converted address request response message of the converted address information that is received by the BGF to the calling party session media stream, and then feeds back to the AF;
  • Step S108 the AF receives the session establishment message of the called party (wherein the AF receives the session establishment message of the calling party and receives the session establishment message of the called party, and there is no order, which is only for convenience of description), and subsequently repeats step S101 to Step S107, in order to implement BGF to allocate translation address information for the called party session media stream, and pass the converted address information assigned to the called party
  • Step S109 The AF respectively converts and converts the translated address information between the calling and the called party according to the converted BGF as the converted address information of the called session media stream, and generates a media stream forwarding entry corresponding to the calling and called session interaction process.
  • Step S110 subsequent, the session interaction between the calling party and the called party is successfully established
  • Step S11 The AF triggers a session establishment success request
  • Step S112 A sends a session establishment success indication command to the SPDF, which is used to indicate that the session establishment is successful to the SPDF, wherein the session establishment success command message sent to the SPDF carries the media flow corresponding to the AF-generated session and the called party session interaction process.
  • Step S113 the SPDF forwards the received session establishment success indication command message carrying the media stream forwarding entry to the corresponding BGF;
  • Step S114 The BGF sends the media stream forwarding entry carried in the received session establishment success indication command message to the forwarding table, and performs the media stream in the process of the interaction between the primary and the called session according to the translated address information in the media stream forwarding entry.
  • Step S115 subsequent, the session interaction process between the calling party and the called party ends;
  • Step S116 the AF triggers the session end indication request
  • Step S117 the AF sends a session end indication command to the SPDF for instructing the SPDF to end, and instructing the SPDF to delete related information associated with the main called session interaction process;
  • Step S118 after receiving the session end indication command, the SPDF deletes the related information (such as locating the relevant policy information of the corresponding BGF) established by the self-called called session interaction process, and the SPDF forwards the session sent by the AF. Ending the indication command to instruct the corresponding BGF to delete related information associated with the interaction process of the calling and called sessions;
  • the related information such as locating the relevant policy information of the corresponding BGF
  • Step S120 After receiving the session end indication command, the BGF deletes the media stream forwarding entry corresponding to the interaction between the primary and the called session in the forwarding table, so as to release the translated address resource (IP address resource or port) occupied by the media stream forwarding entry. Resources, etc.) to the address pool where it is located.
  • IP address resource or port IP address resource or port
  • Step S121 the BGF feeds back a session end request response message to the SPDF;
  • the SPDF further feeds back the received session end request response message to the AF.
  • the RACS model of the TISPAN applied to the media stream conversion address allocation method and the media stream forwarding method of the present invention may be a model for accessing the network, that is, the AF/SPDF/BGF is located in the access network and the core network.
  • it can also be a model for NA(P)T transformation between backbone networks, that is, AF/SPDF/BGF is located at the boundary of different core networks; thus, in the corresponding access network model, AF is sent to SPDF in the above process.
  • the optional network operator identifier is the access network operator identifier (such as XXX@access network identifier, etc.).
  • the optional network operator identifier sent by the AF to the SPDF in the above process is the backbone.
  • Network operator identification (XXX@ dry network identification, etc.);
  • the principle of the present invention is to match and bind the media stream conversion address information of the interaction between the calling and the called party to generate a media stream forwarding entry corresponding to the interaction between the calling party and the called party, and send the generated media stream forwarding entry to the SPDF. And transmitted by the SPDF to the BGF; the BGF can also directly match and bind the media stream translation address information of the interaction between the main and the called session to generate a media stream forwarding entry corresponding to the interaction between the main and the called session.
  • the principle of the solution of the present invention can be used for transforming between different IPv4 address domains, and can also be used for transforming between different address formats such as IPv4 and IPv6.
  • the AF/SPDF/BGF in the principle of the present invention may be in the actual interaction process of the calling and called parties.
  • the conversion address allocation process of the called party session media stream is performed, and then the conversion address allocation process of the calling party session media stream is performed, and it is also possible to perform only the conversion address allocation process for one of the calling party and the called party;
  • the processing of the translation address assigned to the session media stream is updated, partially deleted, and the like, and the processing ideas and principles thereof are the same as or similar to the above description.
  • the principles of the inventive scheme can be used in the TISPAN network architecture defined by ETSI, and can also be used in the 3GPP network framework or other similar network framework models defined by ITU-T.
  • the media stream conversion address allocation method and the media stream forwarding method of the present invention provide a processing scheme, which makes the functional division between functional entities such as AF, SPDF, and BGF more reasonable; and the functional division is more reasonably embodied in the BGF. It only needs to manage its own address resources, and assigns translation address information to the corresponding session media stream according to the management situation.
  • SPDF is only responsible for the allocation policy of the address resource, that is, the corresponding BGF is selected for the session media stream according to the session media stream attribute.
  • the selected BGF allocates the translation address information for the session media stream, thereby alleviating the workload of the SPDF to allocate the translation address for the session media stream, thereby avoiding the possibility that the SPDF work task is too heavy and causing the entire session media stream.
  • the forwarding process failed;
  • the functional division is more reasonable. It is also reflected in the AF address to match and bind the converted address resource information of the calling and called session media streams to establish a media stream forwarding entry corresponding to the process of the primary and called session interaction; or directly matched by BGF and Binding the address resource information of the calling and called session media streams to establish a media stream forwarding entry corresponding to the interaction process of the calling and called sessions; thereby avoiding the redundancy function set on the SPDF and reducing the protocol transmission complexity of the SPDF .

Abstract

Ce procédé d'allocation de l'adresse de traduction de passerelle multimédia comprend les étapes suivantes: la fonction application (AF) reçoit le message établissant la session, avant de placer l'information sur l'attribut de la passerelle multimédia de session comprise dans le message de demande d'adresse de traduction à transmettre vers la fonction de décision de la politique utilisant les services SPDF; la SPDF localise la fonction passerelle de bordure (BGF) correspondante selon l'information d'attribut comprise dans le message de demande et transmet ce dernier à la BGF localisée; la BGF alloue l'adresse de traduction à la passerelle multimédia pour session répondant au message de demande d'adresse de traduction reçu. Ainsi, la prise en charge de la fonction entre AF, SPDF et BGF est plus raisonnable, la charge de travail de SPDF est réduite et la stabilité de la traduction d'adresse de passerelle multimédia est augmentée.
PCT/CN2006/001554 2005-07-05 2006-07-04 Procede d'allocation de l'adresse de traduction de passerelle multimedia et procede de transfert de la passerelle WO2007003136A1 (fr)

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CNB200510081579XA CN100450083C (zh) 2005-07-05 2005-07-05 媒体流转换地址分配方法及其媒体流转发方法

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CN101159671B (zh) * 2007-10-29 2010-06-16 中兴通讯股份有限公司 流量审计方法

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