WO2011097926A1 - 媒体路径优化过程中sdp请求的处理方法及装置 - Google Patents

媒体路径优化过程中sdp请求的处理方法及装置 Download PDF

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Publication number
WO2011097926A1
WO2011097926A1 PCT/CN2010/080225 CN2010080225W WO2011097926A1 WO 2011097926 A1 WO2011097926 A1 WO 2011097926A1 CN 2010080225 W CN2010080225 W CN 2010080225W WO 2011097926 A1 WO2011097926 A1 WO 2011097926A1
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Prior art keywords
information
sdp request
alg
sdp
media
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PCT/CN2010/080225
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English (en)
French (fr)
Inventor
谢振华
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10845596.5A priority Critical patent/EP2536091A4/en
Priority to US13/259,738 priority patent/US9032082B2/en
Publication of WO2011097926A1 publication Critical patent/WO2011097926A1/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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • 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
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2546—Arrangements for avoiding unnecessary translation
    • 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
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/103—Media gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for processing an SDP request in a media path optimization process. Background technique
  • FIG. 1A is a schematic diagram of an IMS media path optimization in the related art, describing an IMS calling terminal
  • the media path established by the existing call process is: UE1, Transmit Gateway (TrGW), TrGW2, TrGW3, TrGW4, UE2, and the media path after the UE is: UE1 TrGWl, TrGW4, UE2, the optimized media path is shorter than the unoptimized media path, and two TrGWs are missing, so the optimized media path saves resources and improves efficiency.
  • the Signaling Gateway Application Layer Gateway (ALG) 1 controls TrGWl, ALG2 controls TrGW2, ALG3 controls TrGW3, and ALG4 controls TrGW4.
  • Figure IB is a flowchart of the IMS media path optimization in the related art.
  • Step 101 UE1 sends a Session Description Protocol (SDP) request to UE2 to negotiate media.
  • the resource information for example, by sending a SIP call signaling, that is, an INVITE request, the message body requested by the Session Initiation Protocol (SIP) carries the SDP request, and the content of the SDP request is the media of the UE1.
  • SIP Session Initiation Protocol
  • Step 102 103 The SDP request arrives at the signaling gateway ALG1, and the signaling gateway ALG1 selects TrGW1 as the media gateway, and the ALG1 first determines whether there is a directly connectable node in the node information recorded in the SDP request, and in this example, Controlling the media gateway to use the media resources in the SDP request The information is allocated for connecting the backward media resource, and the ALG1 replaces the media resource information in the SDP request with the media resource information of the TrGW1 for connecting the backward, and then adds the node information controlled by the ALG1 to the SDP request and forwards the SDP request.
  • the node information includes the forward-accessible domain information of the TrGW1, including the connection information of the corresponding media in the SDP (ie, the media connection information of the UE1), the domain name information, and the like, and the SDP request can be forwarded by, for example, carrying in the SIP signaling; ⁇ 105.
  • the SDP request arrives at the signaling gateway ALG2, and the ALG2 selects TrGW2 as the media gateway.
  • the ALG2 first determines whether there is a directly connectable node in the node information recorded in the SDP request.
  • the media gateway controls the media gateway to use the SDP request.
  • the ALG2 replaces the media resource information in the SDP request with the media resource information of the TrGW2 for connecting the backward, and then adds the node information controlled by the ALG2 to the SDP request.
  • the node information includes the forward accessible domain information of the TrGW2, including the connection information of the corresponding media in the SDP. (I.e., after TrGWl connection information to the media), the domain name information.
  • the SDP request can be forwarded by, for example, carrying in the SIP signaling; in steps 106-107, the SDP request arrives at the signaling gateway ALG3, and the ALG3 selects TrGW3 as the media gateway, and the ALG3 first determines whether there is a direct connection in the node information recorded in the SDP request.
  • the node which is not in this example, controls the media gateway to use the media resource information in the SDP request, and allocates the media resource for connecting the backward.
  • the ALG3 uses the media resource information of the TrGW3 for connecting the backward to replace the SDP request.
  • the media resource information is then forwarded to the SDP request by the ALG3 controlled node information, and the node information includes the forward accessible domain information of the TrGW3, including the connection information of the corresponding media in the SDP (ie, the backward media connection information of the TrGW2). ), domain name information, etc.
  • the SDP request can be forwarded by, for example, carrying in SIP signaling; Steps 108-109, SDP request arrives at the signaling gateway ALG4, ALG4 selects TrGW4 as the media gateway, and ALG4 first determines the node information recorded in the SDP request. Is there a directly connectable node?
  • the forward direction of TrGW4 can be directly connected to the backward direction of TrGW 1 (the backward connection information and domain of TrGW 1)
  • the information is provided by ALG2.
  • the ALG4 judges that there is a directly connectable node according to the domain name;), and then controls the media gateway to use the media resource information provided by the found node information in the SDP request, that is, the backward media connection information of the TrGW1.
  • TrGW4 is allocated for connecting the backward media resource, and the ALG4 replaces the media resource information in the SDP request with the media resource information of the TrGW4 for connecting the backward, and then deletes the node information after the node that the ALG4 finds, and then forwards the SDP.
  • the request is forwarded, for example, by forwarding the SIP signaling to carry the SDP request.
  • Step 110 The SDP request arrives at the UE2, and the UE2 uses the media resource information in the SDP request, and sends an SDP response, and carries the media resource information of the UE2, for example, through SIP signaling. "200 OK" In response, the message body of the SIP response carries the SDP response, and the SDP response arrives at ALG4.
  • ALG4 determines whether the response carries the node information related to the response.
  • ALG4 finds Optimizing the path, and then carrying the node information in the SDP response, including the media connection address information of the TrGW4 for connecting the forward connection and the sequence number of the directly connectable node (in this example, the sequence number is 2, that is, the second node - the TrGWl can be straight
  • the first node in this example is UE1.
  • the ALG4 uses the media resource information of the TrGW4 to connect the forward media resource information instead of the media resource information in the SDP response, and then forwards the SDP response, and the SDP response arrives at the ALG3; Step 112, ALG3 It is judged whether the response carries the node information related to the self.
  • this step is irrelevant (determined according to the sequence number), but since the SDP response carries the node information, the TrGW3 can be bypassed, and then the TrGW3 resource is released and the SDP is forwarded.
  • the SDP response arrives at ALG2; Step 113, ALG2 determines whether the response carries information about the node associated with it, in this example, the step is related ( Broken, the sequence number 2 indicates the node information added by ALG2), and then ALG2 replaces the connection information of the corresponding media in the SDP response with the connection information in the node information (ie, the forward media connection information of TrGW4), and deletes the SDP response. After the node information is forwarded, the SDP response is forwarded.
  • Step 114 ALG1 determines whether the response carries the relevant information. Node information, in this example, there is no node information in this step, so the TrGW1 is used to connect the forward media resource information instead of the media resource information in the SDP response, and then the SDP response is forwarded, and the SDP response arrives at ALG3; The media path is established, and the media paths are UE1, TrGW1, TrGW4, and UE2.
  • the ALG receiving the SDP request cannot determine whether the path that the SDP request has experienced includes the algorithm that does not support the optimization algorithm.
  • ALG and all ALGs are regarded as ALGs that support optimization algorithms, so that when there is no support optimization algorithm in the path, it may get the wrong optimized media path, and even lead to subsequent communication failure.
  • the ALG3 is unenhanced in the above process (that is, the optimization algorithm is not supported), it does not modify the node information in the SDP request when directly receiving the SDP request, and directly forwards it.
  • the ALG4 is in accordance with the SDP request.
  • the node information can find the directly connected node TrGW1 and use the media connection information of TrGW1, so finally the above optimized media path can be established, but in step 112, ALG3 will establish the media connection of TrGW3 with TrGW4 and TrGW2 in the normal steps, without Release TrGW3 resources, resulting in The last optimized media path error was established. Moreover, if ALG3 also provides a new codec, and the encoder is finally selected for use by UE2, it will cause TrGW1 and TrGW4 to communicate with different codecs, respectively, which may cause subsequent communication failure.
  • 1C is a schematic flowchart of error in the IMS media path optimization in the related art. Corresponding to the flowchart of FIG.
  • the ALG1 supports the encoders a and b, the ALG3 adds the codec c, and the UE2 selects the codec c.
  • ALG4 also chooses to use codec c.
  • ALG3 sees that only the codecs a and b are supported in the forward direction, so the selection will perform format conversion between codecs c and a, and notify the forward to use codec a, Finally ALG1 will choose to use codec a.
  • the UE1 transmits the media to the TrGW1 controlled by the ALG1 using the codec a, the TrGW1 forwards the media to the TrGW4, the TrGW4 forwards the media to the UE2, and the UE2 selects to receive the media using the codec c, and the result cannot be decoded; otherwise, the UE2 uses the codec c.
  • the medium is transmitted to the ALG4 controlled TrGW4, the TrGW4 forwards the medium to the TrGW1, and the TrGW1 forwards the medium to the UE1, and the UE1 selects to use the codec a to receive the medium, so that the decoding cannot be performed, resulting in communication failure.
  • a primary object of the present invention is to provide a method and apparatus for processing an SDP request in a media path optimization process to at least solve the above problems.
  • a method for processing an SDP request in a media path optimization process including: ALG receiving an SDP request; and determining, by the ALG, media connection information used by the SDP request and last information in the node information in the SDP request The media connection information in the access domain information is different; the ALG adds its forward accessible domain information and subsequent accessible domain information to the end of the node information in the SDP request, and then sends an SDP request.
  • an ALG is provided, comprising: receiving means for receiving
  • a determining device configured to determine whether the media connection information used by the SDP request is different from the media connection information of the last accessible domain information recorded in the node information in the SDP request; and adding means for determining at the determining device If the result is YES, the forward accessible domain information of the ALG and the backward accessible domain information of the ALG are sequentially added to the tail of the node information in the SDP request, and the judgment result of the device is negative. Next, the ALG's backward accessible domain letter The information is added to the tail of the node information in the SDP request; and the transmitting device is configured to send the SDP request processed by the adding device.
  • the ALG receiving the SDP request determines the media connection information used by the SDP request and the SDP request. Whether the media connection information in the last accessible domain information in the node information is the same, whether it is that there is an ALG that does not support the optimization algorithm, and corresponding processing according to the judgment result, solving the problem in the prior art and ensuring optimization
  • the media path is correct, ensuring normal communication and is easy to implement.
  • FIG. 1A is a schematic diagram of IMS media path optimization in the related art
  • FIG. 1B is a flowchart of IMS media path optimization in the related art
  • FIG. 1C is a schematic diagram of IMS media path optimization error in the related art
  • FIG. 2B is a schematic structural diagram of an ALG according to a preferred embodiment of the present invention
  • FIG. 3 is a flowchart of a method for processing media path optimization according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a second manner in which an ALG processes an SDP request according to an embodiment of the present invention
  • FIG. 5 is a flowchart of an IMS media path optimization according to an embodiment of the present invention
  • FIG. 7 is a flowchart of Embodiment 1 of the present invention
  • FIG. 8 is a flowchart of Embodiment 2 of the present invention.
  • the ALG mainly includes: a receiving device 10, an adding device 20, and a transmitting device 30.
  • the receiving device 10 is configured to receive an SDP request
  • the determining device 40 is configured to determine whether the media connection information used by the SDP request and the media connection information of the last accessible domain information recorded in the node information in the SDP request are
  • the adding device 20 is configured to sequentially add the forward accessible domain information of the ALG and the backward accessible domain information of the ALG to the node information in the SDP request if the determination result of the determining device 40 is YES.
  • the transmitting device 30 is configured to transmit the processed by the adding device 20.
  • the ALG provided by the embodiment of the present invention may add both forward accessible domain information and backward accessible domain information in the SDP request, so that the subsequent signaling gateway can determine whether there is an ALG that does not support the optimization algorithm.
  • the media connection information used by the SDP request is different from the media connection information of the last accessible domain recorded in the node information, two processing schemes may be used in the embodiment of the present invention, and one is to delete the recorded information in the node information.
  • the ALG may further include: a deleting device 50, configured to: before the determining result of the determining device 40 is YES, before the adding device 20 adds the node information to the node information in the SDP request, Delete all accessible domain information of the node information record in the SDP request.
  • the adding means 20 is further configured to include the codec information in the SDP request in the forward accessible domain information added to the node information.
  • FIG. 3 is a flowchart of a method for processing media path optimization according to an embodiment of the present invention, as shown in FIG.
  • the method mainly includes the following steps (step S302 - step S306): Step S302: The ALG receives the SDP request; Step S304: The ALG determines the media connection information used by the SDP request and the last accessible domain information in the SDP request The media connection information is different; step S306: the ALG adds its node information to the tail of the node information in the SDP request, and then sends the SDP request, where the node information of the ALG includes: ALG's forward accessibility Domain information and ALG's backward accessible domain information.
  • the ALG when sending an SDP request, the ALG adds its forward accessible domain information to the SDP request, and also adds its backward accessible domain information, so that the subsequent signaling gateway can Determine if there is an ALG that does not support the optimization algorithm.
  • the ALG before forwarding the SDP request, the ALG will determine whether the path that the SDP request passes includes an ALG that does not support the optimization algorithm according to the node information recorded in the SDP request, and perform corresponding according to the judgment result.
  • the SDP request processing mode is provided in the embodiment of the present invention. The two methods are described below.
  • FIG. 4 is a flowchart of the method. As shown in FIG.
  • Step S401 the ALG determines the node in the SDP request. Whether the accessible domain information is recorded in the information, if yes, step S402 is performed, otherwise, step S406 is performed; in the embodiment of the present invention, if the accessible domain information is not recorded in the node information in the SDP request, the SDP is determined.
  • the media connection information requested to be used is different from the media connection information in the last accessible domain information in the node information in the SDP request.
  • Step S402 the ALG determines whether the media connection information used by the SDP request is different from the media connection information of the last accessible domain information recorded in the node information in the SDP request, and if yes, executing step S403; otherwise, performing steps S404; Because the ALG that does not support the optimization algorithm can only forward the SDP request when receiving the SDP request, The node information in the SDP request cannot be modified, and therefore, when it is determined that the media connection information used by the SDP request is different from the media connection information of the last accessible domain information recorded in the node information in the SDP request, the SDP request can be determined.
  • the path that is experienced contains an ALG that does not support the optimization algorithm.
  • Step S403 the ALG deletes all accessible domain information recorded in the node information in the SDP request.
  • Step S404 the ALG determines whether the accessible domain corresponding to the accessible domain information of the node information record exists with the forward accessible domain of the ALG or the latter. The accessible domain directly connected to the accessible domain, if yes, step S405 is performed, otherwise, step S406 is performed; in the specific implementation process, the forward accessible domain information of the ALG and the backward accessible domain information of the ALG may be Including: connection information and domain name information, the ALG can determine whether there is a direct connection according to the domain name information in the accessible domain information recorded in the node information.
  • the forward-accessible domain information of the ALG may include codec information in the SDP request, or may not include codec information in the SDP request.
  • Step S405 the ALG deletes the accessible domain information recorded in the node information after the accessible domain information corresponding to the accessible domain;
  • Step S406 the ALG adds its node information to the tail of the node information in the SDP request in an orderly manner; In this step, if the forward accessible domain information of the ALG is the same as the last accessible domain information of the node information record in the SDP request, the node information added by the ALG to the tail includes only the backward accessible domain information of the ALG.
  • the node information added by the ALG to the end of the team includes: ALG's forward accessible domain information and ALG's backward accessible domain information.
  • Step S407 the ALG forwards the foregoing SDP request. In this way, after determining that there is an ALG that does not support optimization, the ALG deletes the node information before the ALG, thereby avoiding the problem of bypassing the ALG that does not support optimization in the media optimization process, resulting in an optimized media path error.
  • Step S501 The ALG determines whether the accessible domain information is recorded in the node information in the SDP request, and if yes, step S502 is performed, otherwise, step S503 is performed; Step S502, ALG Determining whether the media connection information used by the SDP request is different from the media connection information of the last accessible domain information recorded in the node information in the SDP request, if yes, executing step S503; otherwise, performing step S504; step S503
  • the ALG adds its forward accessible domain information and subsequent accessible domain information to the tail of the node information in the SDP request; in step S504, the ALG adds the backward accessible domain information to the node information in the SDP request.
  • Step S505 the ALG forwards the SDP request.
  • the subsequent ALG can learn the codec information used by the ALG, thereby avoiding the use of the inconsistent codec.
  • the resulting communication failure problem the process of media path optimization is performed when the SDP response is received. Specifically, when the ALG receives the SDP response of the SDP request returned by the destination user equipment, the ALG determines the accessible domain of the node information record requested by the SDP.
  • the ALG sends the media connection information carrying the accessible domain to the destination user equipment.
  • Update message, update the media connection information, and after receiving the consent update message returned by the destination user equipment, carry the direct connection information in the SDP response, where the direct connection information includes: media resource information and provision in the SDP response.
  • the direct connection information includes: media resource information and provision in the SDP response.
  • TrGW1 and TrGW4 can be directly connected, ALG2 does not support the optimization algorithm.
  • the optimized path obtained according to the technical solution provided by the embodiment of the present invention does not select UE1, TrGW1, TrGW4, UE2, and the final obtained media path is: UE1, TrGW1, TrGW2, UE2.
  • the technical solutions provided by the embodiments of the present invention are described in detail by using specific embodiments in FIG. Detailed description.
  • the ALG1 controlled TrGW1 may be directly connected to the ALG4 controlled TrGW4, and the ALG2 controlled TrGW2 may also be directly connected to the UE2, and the ALG2 does not support the optimization algorithm.
  • Step 701 UE1 sends an SDP request to UE2 to negotiate media resource information, for example, by sending SIP call signaling. That is, the INVITE request invites the SDP request with the message body of the SIP request, and the content of the SDP request is the media resource information of the UE 1; Steps 702 to 703, the SDP request arrives at the signaling gateway ALG1, and the signaling gateway ALG1 selects TrGW1. As the media gateway, the ALG1 first determines whether the connection information in the last accessible domain in the node information recorded in the SDP request is the same as in the SDP request.
  • no node information there is no node information, and it is determined whether the node information recorded in the SDP request is There is a directly connectable node. In this example, there is no node information, and it is determined whether the last node information is forward accessible domain information. In this example, there is no node information, and then the media gateway is controlled to use the media resource information in the SDP request. And allocate the media resources for connecting backwards, and ALG1 replaces the media resources in the SDP request with the media resource information of TrGW1 for connecting the backwards.
  • the source information, and then the ALG1 controlled node information is added to the SDP request to forward the SDP request, the node information includes the forward accessible domain information and the backward accessible domain information of the TrGW1, and the forward accessible domain information includes the corresponding media in the SDP.
  • the connection information ie, the media connection information of the UE1, the domain name information, and the like, the backward accessible domain information includes the media connection information of the TrGW1, the domain name, and the like, and the SDP request may be forwarded by, for example, forwarding the SIP signaling to carry the SDP request;
  • the SDP request arrives at the signaling gateway ALG2.
  • the ALG2 does not support the optimization algorithm, and forwards the SDP request according to the standard procedure.
  • the ALG3 first determines the record in the SDP request. Whether the connection information in the last accessible domain of the node information is the same as that in the SDP request. In this example, the connection information is TrGW1 in the node information, and the connection information of TrGW2 in the SDP request.
  • control TrGW3 to use the media resource information in the SDP request, and allocate TrGW3 for connecting the backward media resource
  • the ALG3 replaces the media resource information in the SDP request with the media resource information of the TrGW3 for connecting the backward, and then adds the node information controlled by the ALG3 to the SDP request to forward the SDP request, where the node information includes the forward accessible domain information of the TrGW3.
  • the forward accessible domain information includes connection information of the corresponding media in the SDP (ie, backward media connection information of TrGW2), domain name information, etc., the backward accessible domain information includes connection information of TrGW3, domain name, etc., and then forwards The SDP request, for example, by forwarding the SIP signaling to carry the SDP request for forwarding; Steps 707 to 708, the SDP request arrives at the signaling gateway ALG4, and the ALG4 selects TrGW4 as the media gateway, and the ALG4 first determines according to the steps in step 705, in this example, The result is the same, and then it is judged whether there is a directly connectable node in the node information recorded in the SDP request.
  • connection information of the corresponding media in the SDP ie, backward media connection information of TrGW2
  • the backward accessible domain information includes connection information of TrGW3, domain name, etc.
  • the backward direction of TrGW4 can be directly connected with TrGW2 (the backward connection information and domain name information of TrGW2 are provided by ALG3)
  • ALG4 judges that there is a directly connectable node according to the domain name;), and then bypasses the media gateway, and the ALG4 replaces the SDP request with the connection information in the found node information (that is, the media resource information used by TrGW2 for connecting backward).
  • Media resource information then delete the node information after the node that ALG4 will find, and then forward the SDP request, for example by forwarding the SIP message.
  • Step 709 The SDP request arrives at the UE2, and the UE2 uses the media resource information in the SDP request, and sends an SDP response, and carries the media resource information of the UE2, for example, a "200 OK" response by using SIP signaling.
  • the message body of the SIP response carries the SDP response, and the SDP response arrives at the ALG4.
  • Step 710 The ALG4 determines whether the response carries the node information associated with the node. In this example, there is no node information in this step, and the optimized path is found by ALG4.
  • Step 711 ALG3 determines Whether the response carries the node information related to it, in this example, the step is related (the number is judged, the sequence number is 1 indicates the node information added by ALG3), and then the ALG3 uses the connection information in the node information (ie, UE2 Media connection information) Instead of the connection information of the corresponding media in the SDP response, and deleting the node information in the SDP response, the SDP response is forwarded due to the received SDP response.
  • the step 711 the step is related (the number is judged, the sequence number is 1 indicates the node information added by ALG3), and then the ALG3 uses the connection information in the node information (ie, UE2 Media connection information) Instead of the connection information of the corresponding media in the SDP response, and deleting the node information in the SDP response, the SDP response is forwarded due to the received SDP response.
  • the node information is carried, so TrGW3 can be bypassed, so ALG3 releases the resources of TrGW3, and the SDP response arrives at ALG2;
  • Step 712 ALG2 establishes a media connection using TrGW2 according to the standard procedure and forwards the SDP response, and the SDP response arrives at ALG1;
  • Step 713 ALG1 determines whether the response carries the node information related to it.
  • the TrGW1 is used to connect the forward media resource information instead of SDP.
  • the media resource information in response, and then forward the SDP response, the SDP response arrives at UE1; thus, the optimized media path is established, and the media path is UE1, TrGW TrGW2, UE2.
  • FIG. 8 is a flowchart corresponding to the embodiment of the present invention, which mainly includes the following steps: Step 801: UE1 sends an SDP request to UE2 to negotiate media resource information, for example, by sending SIP call signaling. That is, the INVITE request invites the SDP request with the message body of the SIP request, and the content of the SDP request is the media resource information of the UE 1; Steps 802 to 803, the SDP request arrives at the signaling gateway ALG1, and the signaling gateway ALG1 selects TrGW1 As a media gateway, the ALG1 controls the media gateway to use the media resource information in the SDP request, and allocates the media resource for connecting the backward.
  • Step 801 UE1 sends an SDP request to UE2 to negotiate media resource information, for example, by sending SIP call signaling. That is, the INVITE request invites the SDP request with the message body of the SIP request, and the content of the SDP request is the media resource information of the UE 1; Step
  • the ALG1 uses the media resource information of the TrGW1 for connecting the backward media resource information in the SDP request.
  • the ALG1 determines whether the connection information in the last accessible domain of the node information recorded in the SDP request is the same as that in the SDP request. In this example, if there is no node information, the node information controlled by the ALG1 is added to the SDP request to forward the SDP request.
  • the node information includes forward accessible domain information and backward accessible domain information of TrGW 1, and forward accessible domain information includes phase in SDP
  • the connection information of the media ie, the media connection information of UE1
  • the backward accessible domain information includes the media connection information and the domain name of the TrGW1
  • the SDP request can be forwarded by, for example, forwarding SIP signaling carries the SDP request for forwarding
  • Steps 804-805 SDP request arrives at the signaling gateway ALG2, ALG2 does not support the optimization algorithm, forwards the SDP request according to the standard procedure, ALG2 also supports the codec c, and therefore the forwarded SDP request Codec c is included
  • Steps 806-807 SDP request arrives at signaling gateway ALG3, ALG3 selects TrGW3 as media gateway, ALG3 controls TrGW3 to use media resource information in SDP request, and allocates TrGW3 for connecting backward media The resource, the ALG3 uses the
  • the last node information includes the backward connection information of TrGW1, and the SDP request includes the backward connection information of TrGW2, Adding the node information controlled by the ALG3 to the SDP request, and forwarding the SDP request, the node information includes the forward accessible domain information and the backward accessible domain of the TrGW3.
  • the forward accessible domain information includes connection information of corresponding media in the SDP (ie, backward media connection information of TrGW2), domain name information, codec information (a, b, c), etc.
  • the backward accessible domain information includes The connection information of the TrGW3, the domain name, etc., and then forward the SDP request, for example, by forwarding the SIP signaling to carry the SDP request for forwarding; Step 4: 808 to 809, SDP request to the signaling gateway ALG4, ALG4 selects TrGW4 as the media gateway, ALG4 controls TrGW4 uses the media resource information in the SDP request, and allocates TrGW4 for connecting the backward media resource, and the ALG4 replaces the media resource information in the SDP request with the media resource information of the TrGW4 for connecting the backward, and the ALG4 determines the record in the SDP request.
  • connection information in the last accessible domain of the node information is the same as in the SDP request.
  • the node information controlled by ALG4 is added to the SDP request to forward the SDP request, and the node information includes the backward direction of TrGW4. Accessible domain information, backward accessible domain information including TrGW4 connection information and domain name, etc., and then forward SDP requests, such as by forwarding
  • the SIP signaling carries the SDP request for forwarding.
  • Step 810 The SDP request arrives at the UE2.
  • the UE2 uses the media resource information in the SDP request and selects to use the codec c, and sends an SDP response, and carries the media resource information of the UE2, for example, through the SIP.
  • the "200 OK" response of the signaling the message body of the SIP response carries the SDP response, and the SDP response arrives at ALG4;
  • Step 811 ALG4 determines whether there is a directly connectable node in the node information recorded in the SDP request, this example
  • the backward direction of the TrGW4 may be directly connected to the TrGW2;
  • Steps 812-813, ALG4 send an update message to the UE2, and update the media connection information, where the SDP request is carried, where the media connection information is the media connection information in the found node, that is, the TrGW2
  • the backward media connection information the UE2 sends a consent update message, and carries the SDP response.
  • Step 814 the ALG4 receives the consent update message, because the ALG4 finds the optimized path, and then carries the node information in the SDP response, including the media resource information in the SDP response. And the sequence number of the directly connectable node (in this example, the sequence number is 3), ALG4 forwards the SDP response, and the SDP response arrives at ALG3;
  • Step 815 ALG3 Whether the disconnected response carries the node information related to it, in this example, the step is related (determined according to the sequence number, the sequence number 3 indicates the node information added by ALG3), and then the connection information in the node information of ALG3 (ie, UE2) The media connection information) replaces the connection information of the corresponding media in the SDP response, and deletes the node information in the SDP response, and then forwards the SDP response, because the received SDP response carries the node information, so TrGW3 can be bypassed, so ALG3 The TrGW3 resource is released, and the SDP response arrives at the A
  • Step 816 The ALG2 establishes a media connection and forwards the SDP response by using the TrGW2 according to a standard procedure, and the SDP response arrives at the ALG1.
  • Step 817 The ALG1 determines whether the response carries the node information associated with the node. In this example, there is no node information in this step, so the media resource information in the SDP response is replaced by the TrGW1 for connecting the forward media resource information, and then the SDP response is forwarded, and the SDP response arrives at the UE1; thus, the optimized media path is established.
  • the media paths are UE1, TrGW1, TrGW2, and UE2.
  • the ALG receiving the SDP request determines the SDP. Whether the media connection information requested to be used is the same as the media connection information in the last accessible domain information in the node information in the SDP request, and whether there is an ALG that does not support the optimization algorithm.
  • the SDP request may be correspondingly processed according to the determination result, so as to avoid bypassing the ALG that does not support the optimization algorithm in the process of optimizing the path of the media, and solving the problems in the prior art, and ensuring Optimize the correct media path, ensure normal communication, and be easy to implement.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any particular combination of hardware and software.
  • the above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

本发明公开了一种媒体路径优化过程中SDP请求的处理方法及装置。其中，该方法包括：ALG接收SDP请求；ALG确定SDP请求使用的媒体连接信息与SDP请求中的节点信息中的最后一个可访问域信息中的媒体连接信息不同；ALG将其前向可访问域信息和其后向可访问域信息有序地添加到SDP请求中的节点信息的队尾，然后发送SDP请求。通过本发明，可以保证优化媒体路径的正确，确保正常的通信。

Description

媒体 i¾j 优化过程中 SDP请求的处理方法及装置 技术领域 本发明涉及通信领域， 具体而言， 涉及一种媒体路径优化过程中 SDP请 求的处理方法及装置。 背景技术
IP多媒体子系统 （ IP Multimedia Core Network Subsystem, 简称为 IMS ) 是由第三代合作伙伴计划 （ 3rd Generation Partnership Project, 简称 3GPP ) 提出的一种基于 IP的网络架构， 该系统构建了一种开放而灵活的业务环境， 支持多媒体应用， 能够为用户提供丰富的多媒体业务。 图 1A为相关技术中 IMS媒体路径优化示意图， 描述了 IMS主叫终端
UE1与 IMS被叫终端 UE2之间的不同媒体路径以及相应的信令路径。 如图 1A 所示， 现有的呼叫过程建立的媒体路径为： UE1、 传输网关 （Transmit Gateway, 简称为 TrGW ) 1、 TrGW2、 TrGW3、 TrGW4、 UE2, 而优 4匕后的 媒体路径为： UE1、 TrGWl、 TrGW4、 UE2, 优化后的媒体路径比未优化的 媒体路径短了， 少了两个 TrGW , 因而优化的媒体路径节省了资源， 也提高 了效率。其中信令网关应用层网关（Application Layer Gateway, 简称为 ALG ) 1控制着 TrGWl , ALG2控制着 TrGW2, ALG3控制着 TrGW3 , ALG4控制 着 TrGW4。 图 IB为相关技术中 IMS媒体路径优化的流程图， 与图 1A的示意图相 对应， 主要包括以下步骤： 步骤 101、 UE1向 UE2发送会话描述协议 ( Session Description Protocol, 简称为 SDP )请求以协商媒体资源信息， 比如通过发送 SIP的呼叫信令， 即 INVITE (邀请）请求， 以该会话初始化协议 ( Session Initiation Protocol, 简 称为 SIP )请求的消息体携带该 SDP请求， SDP请求的内容为 UE1的媒体资 源信息； 步骤 102 103、 SDP 请求到达信令网关 ALG1 , 信令网关 ALG1 选择 TrGWl作为媒体网关， ALG1先判断 SDP请求中记录的节点信息中是否有 可直连的节点， 本例中没有， 则控制该媒体网关使用 SDP请求中的媒体资源 信息， 并分配用于连接后向的媒体资源， ALG1用 TrGWl的用于连接后向的 媒体资源信息代替 SDP请求中的媒体资源信息，然后将 ALG1控制的节点信 息加入该 SDP请求后转发 SDP请求，该节点信息包含 TrGWl的前向可访问 域信息， 包括 SDP中相应媒体的连接信息 （即 UE1的媒体连接信息）、 域名 信息等， SDP请求可通过比如携带在 SIP信令中转发； 步骤 104〜105、 SDP请求到达信令网关 ALG2, ALG2选择 TrGW2作为 媒体网关， ALG2先判断 SDP请求中记录的节点信息中是否有可直连的节点， 本例中没有， 则控制该媒体网关使用 SDP请求中的媒体资源信息， 并分配用 于连接后向的媒体资源， ALG2用 TrGW2的用于连接后向的媒体资源信息代 替 SDP请求中的媒体资源信息， 然后将 ALG2控制的节点信息加入该 SDP 请求后转发 SDP请求， 该节点信息包含 TrGW2的前向可访问域信息， 包括 SDP中相应媒体的连接信息（即 TrGWl的后向媒体连接信息）、域名信息等。 SDP请求可通过比如携带在 SIP信令中转发； 步骤 106-107, SDP请求到达信令网关 ALG3 , ALG3选择 TrGW3作为 媒体网关， ALG3先判断 SDP请求中记录的节点信息中是否有可直连的节点， 本例中没有， 则控制该媒体网关使用 SDP请求中的媒体资源信息， 并分配用 于连接后向的媒体资源， ALG3用 TrGW3的用于连接后向的媒体资源信息代 替 SDP请求中的媒体资源信息， 然后将 ALG3控制的节点信息加入该 SDP 请求后转发 SDP请求， 该节点信息包含 TrGW3的前向可访问域信息， 包括 SDP中相应媒体的连接信息（即 TrGW2的后向媒体连接信息）、域名信息等， SDP请求可通过比如携带在 SIP信令中转发； 步骤 108〜109、 SDP请求到达信令网关 ALG4, ALG4选择 TrGW4作为 媒体网关， ALG4先判断 SDP请求中记录的节点信息中是否有可直连的节点， 本例中 TrGW4的前向可以和 TrGW 1 的后向直连 ( TrGW 1 的后向连接信息 和域名信息是由 ALG2提供的， ALG4根据域名判断前面有可直连的节点；)， 于是控制该媒体网关使用 SDP 请求中的找到的节点信息提供的媒体资源信 息， 即 TrGWl的后向媒体连接信息， 并分配 TrGW4用于连接后向的媒体资 源， ALG4用 TrGW4的用于连接后向的媒体资源信息代替 SDP请求中的媒 体资源信息，然后将 ALG4将找到的节点之后的节点信息删除，然后转发 SDP 请求， 比如通过转发 SIP信令携带该 SDP请求来转发； 步骤 110、 SDP请求到达 UE2 , UE2使用 SDP请求中的媒体资源信息， 并发送 SDP响应，携带 UE2的媒体资源信息，比如通过 SIP信令的 "200 OK" 回应， 以该 SIP回应的消息体携带该 SDP响应， 该 SDP响应到达 ALG4; 步骤 111、 ALG4 判断响应中是否携带有与己相关的节点信息， 本例中 此步没有节点信息， 因 ALG4找到了优化路径， 于是在 SDP响应中携带节点 信息， 包括 TrGW4 的用于连接前向的媒体连接地址信息和可直连节点的序 号 （本例中序号为 2, 即第二个节点—— TrGWl可直连， 本例中第一个节点 为 UE1 ), ALG4用 TrGW4的用于连接前向的媒体资源信息代替 SDP响应中 的媒体资源信息， 然后转发 SDP响应， 该 SDP响应到达 ALG3; 步骤 112、 ALG3 判断响应中是否携带有与己相关的节点信息， 本例中 此步不相关 （根据序号判断）， 但因 SDP响应中携带节点信息， 因此 TrGW3 可以被旁路， 于是释放 TrGW3 的资源并转发 SDP响应， 该 SDP响应到达 ALG2; 步骤 113、 ALG2 判断响应中是否携带有与己相关的节点信息， 本例中 此步为相关 （ 居序号判断， 序号为 2表示是由 ALG2添加的节点信息）， 于是 ALG2用节点信息中的连接信息 （即 TrGW4的前向媒体连接信息） 代 替 SDP响应中相应媒体的连接信息， 并删除 SDP响应中的节点信息后转发 SDP响应， 因收到的 SDP响应中携带节点信息， 因此 TrGW2可以被旁路， 于是 ALG2释放 TrGW2的资源， SDP响应到达 ALG1； 步骤 114、 ALG1 判断响应中是否携带有与己相关的节点信息， 本例中 此步没有节点信息，于是用 TrGWl的用于连接前向的媒体资源信息代替 SDP 响应中的媒体资源信息， 然后转发 SDP响应， 该 SDP响应到达 ALG3; 至 此， 优化的媒体路径便建立起来， 媒体路径为 UE1、 TrGWl、 TrGW4、 UE2。 在上述媒体优化流程中，由于 SDP请求的节点信息中只记录了每个 ALG 的前向媒体连接信息，接收 SDP请求的 ALG无法判断该 SDP请求已经历的 路径中是否包含有不支持优化算法的 ALG, 而将所有 ALG都当作是支持优 化算法的 ALG, 从而使得在路径中存在不支持优化算法时， 可能得到错误的 优化媒体路径， 甚至将导致后续通信失败。 例如， 在上述流程如果 ALG3为 未增强的 （即不支持优化算法）， 则其在接收到 SDP请求时不会修改 SDP请 求中的节点信息， 直接转发， 在步骤 108中， ALG4根据 SDP请求中节点信 息可以找到直连节点 TrGWl , 并使用 TrGWl的媒体连接信息， 因此最后可 以建立上述的优化媒体路径， 但步骤 112 中 ALG3 会按正常的步骤建立 TrGW3与 TrGW4及 TrGW2的媒体连接， 而不会释放 TrGW3的资源， 导致 最后建立的优化媒体路径错误。 并且， 如果 ALG3还提供了新的编解码器， 而此编码器最终被 UE2选择 使用， 则会导致 TrGWl与 TrGW4分别使用不同的编解码器通讯， 进而导致 后续的通信失败。 图 1C为相关技术中 IMS媒体路径优化的流程图出错示意 图， 与图 1B的流程图相对应， 支设 ALG1支持编码器 a和 b, ALG3添加了 编解码器 c, UE2选择了编解码器 c, ALG4也选择使用编解码器 c, ALG3 看到前向只支持编解码器 a和 b, 于是选择将进行编解码器 c和 a之间的格 式转换， 并通知前向使用编解码器 a, 最终 ALG1会选择使用编解码器 a。 因 而 UE1使用编解码器 a向 ALG1控制的 TrGWl发送媒体， TrGWl向 TrGW4 转发媒体， TrGW4转发媒体给 UE2, 而 UE2选择使用编解码器 c接收媒体， 结果无法解码； 反之， UE2使用编解码器 c向 ALG4控制的 TrGW4发送媒 体， TrGW4转发媒体给 TrGWl , TrGWl转发媒体给 UE1 , 而 UE1选择使用 编解码器 a接收媒体， 因此无法解码， 导致通信失败。 由此可见， 在相关技术中， 在媒体路径优化的处理过程中， 由于无法判 断 SDP请求的路径中是否包含有不支持优化算法的 ALG, 从而导致最终得 到的优化媒体路径错误， 且该错误的优化媒体路径还会导致通信失败。 发明内容 本发明的主要目的在于提供一种媒体路径优化过程中 SDP 请求的处理 方法及装置， 以至少解决上述问题。 根据本发明的一个方面，提供了一种媒体路径优化过程中 SDP请求的处 理方法， 包括： ALG接收 SDP请求； ALG确定 SDP请求使用的媒体连接信 息与 SDP 请求中的节点信息中的最后一个可访问域信息中的媒体连接信息 不同； ALG将其前向可访问域信息和其后向可访问域信息有序地添加到 SDP 请求中的节点信息的队尾， 然后发送 SDP请求。 根据本发明的另一方面， 提供了一种 ALG, 包括： 接收装置， 用于接收
SDP请求； 判断装置， 用于判断 SDP请求所使用的媒体连接信息与 SDP请 求中的节点信息中记录的最后一个可访问域信息的媒体连接信息是否不同； 添加装置， 用于在判断装置的判断结果为是的情况下， 将 ALG 的前向可访 问域信息和 ALG的后向可访问域信息有序地添加到 SDP请求中的节点信息 的队尾， 在判断装置的判断结果为否的情况下， 将 ALG 的后向可访问域信 息添加到 SDP请求中的节点信息的队尾； 以及发送装置， 用于发送经添加装 置处理后的 SDP请求。 通过本发明， 通过在 SDP请求中即添加前向可访问 i或信息， 又添力口后向 可访问域信息，接收到 SDP请求的 ALG通过判断该 SDP请求使用的媒体连 接信息与该 SDP 请求中的节点信息中的最后一个可访问域信息中媒体连接 信息是否相同， 可以判断是否存在不支持优化算法的 ALG, 并根据判断结果 进行相应处理， 解决了现有技术中的问题， 保证了优化媒体路径的正确， 确 保正常的通信， 且易于实现。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1A为相关技术中 IMS媒体路径优化的示意图； 图 1B为相关技术中 IMS媒体路径优化的流程图； 图 1C为相关技术中 IMS媒体路径优化出错示意图； 图 2A为才艮据本发明实施例的 ALG的结构示意图； 图 2B为才艮据本发明优选实施例的 ALG的结构示意图； 图 3为根据本发明实施例的媒体路径优化的处理方法的流程图； 图 4为本发明实施例中 ALG处理 SDP请求的第一种方式的流程图； 图 5为本发明实施例中 ALG处理 SDP请求的第二种方式的流程图； 图 6为本实施例中 IMS媒体路径优化示意图； 图 7为本发明实施例一的流程图； 图 8为本发明实施例二的流程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 下面对根据本发明实施例的 ALG进行描述。 图 2A为才艮据本发明实施例的 ALG的结构示意图，如图 2所示，该 ALG 主要包括： 接收装置 10、 添加装置 20和发送装置 30。 其中， 接收装置 10 , 用于接收 SDP请求； 判断装置 40 , 用于判断上述 SDP请求所使用的媒体连 接信息与该 SDP 请求中的节点信息中记录的最后一个可访问域信息的媒体 连接信息是否不同； 添加装置 20, 用于在判断装置 40的判断结果为是的情 况下， 将 ALG的前向可访问域信息和 ALG的后向可访问域信息有序地添加 到 SDP请求中的节点信息的队尾，在判断装置 40的判断结果为否的情况下， 将 ALG的后向可访问域信息添加到 SDP请求中的节点信息的队尾； 发送装 置 30 , 用于发送经添加装置 20处理后的 SDP请求。 通过本发明实施例提供的上述 ALG, 可以在 SDP请求中既添加前向可 访问域信息， 又添加后向可访问域信息， 使后续的信令网关可以判断是否存 在不支持优化算法的 ALG。 当 SDP 请求所使用的媒体连接信息与节点信息中记录的最后一个可访 问域的媒体连接信息不同时， 在本发明实施例中可以釆用两种处理方案， 一 种是删除节点信息中记录的可访问域信息， 另一种是在节点信息中记录编解 码器信息。 因此， 如图 2B所示， 该 ALG还可以包括： 删除装置 50, 用于在 判断装置 40的判断结果为是的情况下，在添加装置 20在 SDP请求中的节点 信息中添加节点信息之前，删除该 SDP请求中的节点信息记录的所有可访问 域信息。 或者， 在判断装置 40的判断结果为是的情况下， 添加装置 20还用于将 该 SDP 请求中的编解码器信息包含在添加到节点信息中的前向可访问域信 息中。 下面对根据本发明实施例的媒体路径优化的处理方法进行描述， 该方法 可以通过上述图 2A或 2B所示的 ALG实现。 图 3为根据本发明实施例的媒体路径优化的处理方法的流程图， 如图 3 所示， 该方法主要包括以下步骤 (步骤 S302 -步骤 S306 ): 步骤 S302: ALG接收 SDP请求; 步骤 S304: ALG确定该 SDP请求使用的媒体连接信息与 SDP请求中最 后一个可访问域信息中的媒体连接信息不同； 步骤 S306: ALG将其节点信息有序地添加到该 SDP请求中的节点信息 的队尾， 然后发送该 SDP请求， 其中， 该 ALG的节点信息包括： ALG的前 向可访问域信息和 ALG的后向可访问域信息。 通过本发明实施例提供的上述方法， ALG在发送 SDP请求时，在该 SDP 请求中即添加其前向可访问域信息， 也添加其后向可访问域信息， 从而使得 后续的信令网关可以判断是否存在不支持优化算法的 ALG。 在具体实施过程中， ALG在转发 SDP请求前， 将才艮据 SDP请求中记录 的节点信息， 判断该 SDP 请求所经过的路径中是否包含不支持优化算法的 ALG, 并根据判断结果执行相应的优化处理过程， 然后再转发 SDP请求， 具 体地， 在本发明实施例中提供了两种 SDP请求处理方式， 下面分别对这两种 方式进行描述。 方式一 图 4为釆用该方式的流程图， 如图 4所示， 在该方式中， ALG在接收到 SDP请求后， 通过执行以下步骤转发 SDP请求： 步骤 S401 , ALG判断 SDP请求中的节点信息中是否记录有可访问域信 息， 如果是， 则执行步骤 S402, 否则， 执行步骤 S406; 在本发明实施例中，如果 SDP请求中的节点信息中没有记录有可访问域 信息， 则判定 SDP请求使用的媒体连接信息与该 SDP请求中的节点信息中 的最后一个可访问域信息中的媒体连接信息不同。 步骤 S402, ALG判断该 SDP请求所使用的媒体连接信息与该 SDP请求 中的节点信息中记录的最后一个可访问域信息的媒体连接信息是否不同， 如 果是， 则执行步骤 S403 , 否则， 执行步骤 S404; 由于不支持优化算法的 ALG在接收到 SDP请求时，只能转发 SDP请求， 不能修改 SDP请求中的节点信息， 因此， 当判断 SDP请求所使用的媒体连 接信息与该 SDP 请求中的节点信息中记录的最后一个可访问域信息的媒体 连接信息不同时，可以确定该 SDP请求所经历的路径中包含不支持优化算法 的 ALG。 步骤 S403 , ALG删除 SDP请求中节点信息中记录的所有可访问域信息； 步骤 S404, ALG判断节点信息记录的可访问域信息对应的可访问域中 是否存在与 ALG的前向可访问域或后向可访问域直连的可访问域， 如果是， 则执行步骤 S405 , 否则， 执行步骤 S406; 在具体实施过程中， ALG的前向可访问域信息和 ALG的后向可访问域 信息均可以包括： 连接信息和域名信息， 则 ALG可以才艮据节点信息中记录 的可访问域信息中的域名信息判断是否存在直连。 并且， ALG的前向可访问域信息中可以包括 SDP请求中的编解码器信 息， 也可以不包括 SDP请求中的编解码器信息。 步骤 S405 , ALG删除节点信息中记录在该可访问域对应的可访问域信 息之后的可访问域信息； 步骤 S406, ALG将其节点信息有序地添加到 SDP请求中的节点信息的 队尾； 在该步骤中， 如果 ALG的前向可访问域信息与 SDP请求中的节点信息 记录的最后一个可访问域信息相同， 则 ALG 添加到队尾的节点信息只包括 ALG的后向可访问域信息， 否则， ALG添加到队尾的节点信息包括： ALG 的前向可访问域信息和 ALG的后向可访问域信息。 步骤 S407, ALG转发上述 SDP请求。 通过该方式， ALG在判断存在不支持优化的 ALG后， 将该 ALG之前的 节点信息删除， 从而避免了媒体优化过程中旁路该不支持优化的 ALG, 而导 致优化的媒体路径错误的问题。 方式二 图 5为釆用该方式的流程图， 如图 5所示， 在该方式中， ALG在接收到 SDP请求后， 按照执行以下步骤转发 SDP请求： 步骤 S501 , ALG判断 SDP请求中的节点信息中是否记录有可访问域信 息， 如果是， 则执行步骤 S502, 否则， 执行步骤 S503; 步骤 S502, ALG判断该 SDP请求所使用的媒体连接信息与该 SDP请求 中的节点信息中记录的最后一个可访问域信息的媒体连接信息是否不同， 如 果是， 则执行步骤 S503 , 否则， 执行步骤 S504; 步骤 S503 , ALG将其前向可访问域信息和其后向可访问域信息添加到 SDP请求中的节点信息的队尾； 步骤 S504, ALG将其后向可访问域信息添加到 SDP请求中的节点信息 的队尾； 步骤 S505 , ALG转发 SDP请求。 通过该方式， 在判断出存在不支持优化算法的 ALG 时， 通过在节点信 息中记录编解码器信息， 使得后续的 ALG可以获知该 ALG使用的编解码信 息， 从而可以避免使用不一致的编解码器所导致的通信失败的问题。 在上述第二方式中， 在接收到 SDP响应时执行媒体路径优化的过程， 具 体地， ALG接收到目的用户设备返回的 SDP请求的 SDP响应时， ALG判断 SDP 请求的节点信息记录的可访问域信息对应的可访问域中是否存在与该 ALG的前向可访问域或后向可访问域直连的可访问域， 如果是， 则 ALG向 目的用户设备发送携带该可访问域的媒体连接信息的更新消息， 更新该媒体 连接信息， 并在接收到目的用户设备返回的同意更新消息后， 在 SDP响应中 携带直连信息， 其中， 该直连信息包括： SDP响应中的媒体资源信息和提供 能直连的所述可访问域对应的可访问域信息的 ALG的序号， 然后 ALG转发 SDP响应。 从而实现媒体路径的优化。 以图 6为例， 在图 6 中 ALG2不支持优化算法， 并且， TrGW2可以与 ALG4的后向直接， 则如图 6所示， 虽然 TrGWl与 TrGW4可以直连， 但是 ALG2 不支持优化算法， 因此， 根据本发明实施例提供的技术方案得到的优 化路径没有选择 UE1、 TrGWl、 TrGW4、 UE2, 其最终得到的媒体路径为： UE1、 TrGWl、 TrGW2、 UE2。 下面以图 6为例通过具体实施例对本发明实施例提供的技术方案进行详 细说明。下面的实施例中， ALG1控制的 TrGWl可以与 ALG4控制的 TrGW4 直连， 同时， ALG2控制的 TrGW2也可以与 UE2直连， 且 ALG2不支持优 化算法。 实施例一 图 7为相应于图 6的本发明实施例的流程图， 主要包括以下步 4聚： 步骤 701、 UE1 向 UE2发送 SDP请求以协商媒体资源信息， 比如通过 发送 SIP的呼叫信令， 即 INVITE (邀请）请求， 以该 SIP请求的消息体携 带该 SDP请求， SDP请求的内容为 UE 1的媒体资源信息； 步骤 702〜703、 SDP 请求到达信令网关 ALG1 , 信令网关 ALG1 选择 TrGWl作为媒体网关， ALG1先判断 SDP请求中记录的节点信息中最后一 个可访问域中的连接信息是否与 SDP请求中的相同， 本例中没有节点信息， 再判断 SDP请求中记录的节点信息中是否有可直连的节点，本例中没有节点 信息， 再判断最后的节点信息是否是前向可访问域信息， 本例中没有节点信 息， 则控制该媒体网关使用 SDP请求中的媒体资源信息， 并分配用于连接后 向的媒体资源， ALG1 用 TrGWl 的用于连接后向的媒体资源信息代替 SDP 请求中的媒体资源信息，然后将 ALG1控制的节点信息加入该 SDP请求后转 发 SDP请求， 该节点信息包含 TrGWl的前向可访问域信息和后向可访问域 信息， 前向可访问域信息包括 SDP中相应媒体的连接信息 （即 UE1的媒体 连接信息）， 域名信息等， 后向可访问域信息包括 TrGWl的媒体连接信息， 域名等， SDP请求可通过比如转发 SIP信令携带该 SDP请求来转发； 步骤 704、 SDP请求到达信令网关 ALG2, ALG2不支持优化算法， 按标 准过程转发 SDP请求； 步骤 705〜706、 SDP请求到达信令网关 ALG3 , ALG3选择 TrGW3作为 媒体网关， ALG3先判断 SDP请求中记录的节点信息中最后一个可访问域中 的连接信息是否与 SDP 请求中的相同， 本例中不相同 （节点信息中的为 TrGWl 的连接信息， SDP请求中为 TrGW2的连接信息）， 则删除所有节点 信息， 控制 TrGW3使用 SDP请求中的媒体资源信息， 并分配 TrGW3用于 连接后向的媒体资源， ALG3用 TrGW3的用于连接后向的媒体资源信息代替 SDP请求中的媒体资源信息， 然后将 ALG3控制的节点信息加入该 SDP请 求后转发 SDP请求， 该节点信息包含 TrGW3的前向可访问域信息和后向可 访问域信息，前向可访问域信息包括 SDP中相应媒体的连接信息（即 TrGW2 的后向媒体连接信息）， 域名信息等， 后向可访问域信息包括 TrGW3的连接 信息， 域名等， 然后转发 SDP请求， 比如通过转发 SIP信令携带该 SDP请 求来转发； 步骤 707〜708、 SDP请求到达信令网关 ALG4, ALG4选择 TrGW4作为 媒体网关， ALG4先按步骤 705 中的步骤判断， 本例中判断结果为相同， 然 后再判断 SDP请求中记录的节点信息中是否有可直连的节点，本例中 TrGW4 的后向可以和 TrGW2直连 （ TrGW2的后向连接信息和域名信息是由 ALG3 提供的， ALG4根据域名判断前面有可直连的节点；)， 于是旁路该媒体网关， ALG4用找到的节点信息中的连接信息（即 TrGW2的用于连接后向的媒体资 源信息）代替 SDP请求中的媒体资源信息， 然后将 ALG4将找到的节点之后 的节点信息删除， 然后转发 SDP请求， 比如通过转发 SIP信令携带该 SDP 请求来转发； 步骤 709、 SDP请求到达 UE2 , UE2使用 SDP请求中的媒体资源信息， 并发送 SDP响应，携带 UE2的媒体资源信息，比如通过 SIP信令的 "200 OK" 回应， 以该 SIP回应的消息体携带该 SDP响应， 该 SDP响应到达 ALG4; 步骤 710、 ALG4 判断响应中是否携带有与己相关的节点信息， 本例中 此步没有节点信息， 因 ALG4找到了优化路径， 于是在 SDP响应中携带节点 信息， 包括 SDP响应中的媒体资源信息和可直连节点的序号（本例中序号为 1 ), ALG4转发 SDP响应， 该 SDP响应到达 ALG3; 步骤 711、 ALG3 判断响应中是否携带有与己相关的节点信息， 本例中 此步为相关 （ 居序号判断， 序号为 1表示是由 ALG3添加的节点信息）， 于是 ALG3用节点信息中的连接信息 （即 UE2的媒体连接信息） 代替 SDP 响应中相应媒体的连接信息， 并删除 SDP响应中的节点信息后转发 SDP响 应，因收到的 SDP响应中携带节点信息，因此 TrGW3可以被旁路，于是 ALG3 释放 TrGW3的资源， SDP响应到达 ALG2； 步骤 712、 ALG2按标准过程使用 TrGW2建立媒体连接并转发 SDP响 应， 该 SDP响应到达 ALG1； 步骤 713、 ALG1 判断响应中是否携带有与己相关的节点信息， 本例中 此步没有节点信息，于是用 TrGWl的用于连接前向的媒体资源信息代替 SDP 响应中的媒体资源信息， 然后转发 SDP响应， 该 SDP响应到达 UE1; 至此， 优化的媒体路径便建立起来，媒体路径为 UE1、 TrGW TrGW2、 UE2。 实施例二 图 8为相应于图 6的本发明实施例的流程图， 主要包括以下步 4聚： 步骤 801、 UE1 向 UE2发送 SDP请求以协商媒体资源信息， 比如通过 发送 SIP的呼叫信令， 即 INVITE (邀请）请求， 以该 SIP请求的消息体携 带该 SDP请求， SDP请求的内容为 UE 1的媒体资源信息； 步骤 802〜803、 SDP 请求到达信令网关 ALG1 , 信令网关 ALG1 选择 TrGWl作为媒体网关， ALG1控制该媒体网关使用 SDP请求中的媒体资源 信息， 并分配用于连接后向的媒体资源， ALG1用 TrGWl的用于连接后向的 媒体资源信息代替 SDP请求中的媒体资源信息， ALG1判断 SDP请求中记 录的节点信息中最后一个可访问域中的连接信息是否与 SDP请求中的相同， 本例中没有节点信息， 则将 ALG1控制的节点信息加入该 SDP请求后转发 SDP请求， 该节点信息包含 TrGW 1 的前向可访问域信息和后向可访问域信 息， 前向可访问域信息包括 SDP中相应媒体的连接信息 （即 UE1 的媒体连 接信息），域名信息和编解码器信息（ a, b )等，后向可访问域信息包括 TrGWl 的媒体连接信息及域名等， SDP请求可通过比如转发 SIP信令携带该 SDP请 求来转发； 步骤 804〜805、 SDP请求到达信令网关 ALG2, ALG2不支持优化算法， 按标准过程转发 SDP请求， ALG2还支持编解码器 c, 因此在转发的 SDP请 求中包含了编解码器 c; 步骤 806〜807、 SDP请求到达信令网关 ALG3 , ALG3选择 TrGW3作为 媒体网关， ALG3 控制 TrGW3 使用 SDP 请求中的媒体资源信息， 并分配 TrGW3用于连接后向的媒体资源， ALG3用 TrGW3的用于连接后向的媒体 资源信息代替 SDP请求中的媒体资源信息， ALG3判断 SDP请求中记录的 节点信息中最后一个可访问域中的连接信息是否与 SDP请求中的相同，本例 中不相同 （最后节点信息中包含 TrGWl 的后向连接信息， SDP请求中包含 TrGW2的后向连接信息）， 则将 ALG3控制的节点信息加入该 SDP请求后转 发 SDP请求， 该节点信息包含 TrGW3的前向可访问域信息和后向可访问域 信息， 前向可访问域信息包括 SDP中相应媒体的连接信息 （即 TrGW2的后 向媒体连接信息）， 域名信息， 编解码器信息 （a, b, c ) 等， 后向可访问域 信息包括 TrGW3的连接信息， 域名等， 然后转发 SDP请求， 比如通过转发 SIP信令携带该 SDP请求来转发； 步 4聚 808〜809、 SDP请求到达信令网关 ALG4, ALG4选择 TrGW4作为 媒体网关， ALG4 控制 TrGW4 使用 SDP 请求中的媒体资源信息， 并分配 TrGW4用于连接后向的媒体资源， ALG4用 TrGW4的用于连接后向的媒体 资源信息代替 SDP请求中的媒体资源信息， ALG4判断 SDP请求中记录的 节点信息中最后一个可访问域中的连接信息是否与 SDP请求中的相同，本例 中相同， 则将 ALG4控制的节点信息加入该 SDP请求后转发 SDP请求， 该 节点信息包含 TrGW4的后向可访问域信息， 后向可访问域信息包括 TrGW4 的连接信息及域名等， 然后转发 SDP请求， 比如通过转发 SIP信令携带该 SDP请求来转发； 步骤 810、 SDP请求到达 UE2, UE2使用 SDP请求中的媒体资源信息并 选择使用编解码器 c , 并发送 SDP响应， 携带 UE2的媒体资源信息， 比如通 过 SIP信令的 "200 OK" 回应， 以该 SIP回应的消息体携带该 SDP响应， 该 SDP响应到达 ALG4; 步骤 811、 ALG4判断 SDP请求中记录的节点信息中是否有可直连的节 点， 本例中 TrGW4的后向可以和 TrGW2直连； 步骤 812〜813、 ALG4向 UE2发送更新消息， 更新媒体连接信息， 其中 携带 SDP 请求， 其中媒体连接信息为找到的节点中的媒体连接信息， 即 TrGW2的后向媒体连接信息， UE2发送同意更新消息， 携带 SDP响应； 步骤 814、 ALG4收到同意更新消息， 因 ALG4找到了优化路径， 于是 在 SDP响应中携带节点信息， 包括 SDP响应中的媒体资源信息和可直连节 点的序号（本例中序号为 3 ) , ALG4转发 SDP响应，该 SDP响应到达 ALG3； 步骤 815、 ALG3 判断响应中是否携带有与己相关的节点信息， 本例中 此步为相关 （根据序号判断， 序号为 3表示是由 ALG3添加的节点信息）， 于是 ALG3用节点信息中的连接信息 （即 UE2的媒体连接信息） 代替 SDP 响应中相应媒体的连接信息， 并删除 SDP响应中的节点信息后转发 SDP响 应，因收到的 SDP响应中携带节点信息，因此 TrGW3可以被旁路，于是 ALG3 释放 TrGW3的资源， SDP响应到达 ALG2； 步骤 816、 ALG2按标准过程使用 TrGW2建立媒体连接并转发 SDP响 应， 该 SDP响应到达 ALG1； 步骤 817、 ALG1 判断响应中是否携带有与己相关的节点信息， 本例中 此步没有节点信息，于是用 TrGWl的用于连接前向的媒体资源信息代替 SDP 响应中的媒体资源信息， 然后转发 SDP响应， 该 SDP响应到达 UE1; 至此， 优化的媒体路径便建立起来，媒体路径为 UE1、 TrGWl、 TrGW2、 UE2。
从以上的描述中， 可以看出， 在本发明实施例中， 通过在 SDP请求中即 添加前向可访问域信息，又添加后向可访问域信息，接收到 SDP请求的 ALG 通过判断该 SDP请求使用的媒体连接信息与该 SDP请求中的节点信息中的 最后一个可访问域信息中媒体连接信息是否相同， 可以判断是否存在不支持 优化算法的 ALG。 并且， 在本发明实施例中还可以根据判断结果对 SDP请 求进行相应处理， 以使得在媒体优化路径的过程中避免旁路不支持优化算法 的 ALG, 解决了现有技术中的问题， 保证了优化媒体路径的正确， 确保正常 的通信， 且易于实现。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种媒体路径优化过程中 SDP请求的处理方法， 其特征在于， 包括： 应用层网关 ALG接收会话描述协议 SDP请求；
所述 ALG确定所述 SDP请求使用的媒体连接信息与所述 SDP请求 中的节点信息中的最后一个可访问域信息中的媒体连接信息不同；
所述 ALG将其前向可访问域信息和其后向可访问域信息有序地添 加到所述 SDP请求中的节点信息的队尾， 然后发送所述 SDP请求。
2. 居权利要求 1所述的方法， 其特征在于， 在所述 ALG确定所述 SDP 请求使用的媒体连接信息与所述 SDP请求中最后一个可访问域信息中的 媒体连接信息不同之后、所述 ALG有序地将其前向可访问域信息和其后 向可访问域信息到所述 SDP请求中的节点信息的队尾之前， 所述方法还 包括： 所述 ALG删除所述 SDP请求中的节点信息中记录的所有可访问 域信息。
3. 根据权利要求 1所述的方法，其特征在于，所述 ALG将添加到所述 SDP 请求中的所述前向可访问域信息包括：所述 SDP请求中的编解码器信息。
4. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述方法还包 括：
所述 ALG在确定所述 SDP请求使用的媒体连接信息与所述 SDP请 求中最后一个可访问域信息中的媒体连接信息相同的情况下或所述 ALG在接收到所述 SDP请求的 SDP回应的情况下，所述 ALG通过判断 所述节点信息记录的可访问域信息对应的可访问域中是否存在与所述 ALG的前向可访问域或后向可访问域直连的可访问域， 判断是否存在优 化媒体路径。
5. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述方法还包 括：
所述 ALG确定所述 SDP请求使用的媒体连接信息与所述 SDP请求 中的节点信息记录的最后一个可访问域信息中的媒体连接信息相同； 以 及 所述 ALG将其后向可访问域信息添加到所述 SDP请求中的节点信 息的队尾。
6. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述 ALG确定 所述 SDP请求使用的媒体连接信息与所述 SDP请求中的节点信息记录 的最后一个可访问域信息中的媒体连接信息不同包括：
所述 ALG判断所述 SDP请求中是否有节点信息， 如果没有， 则确 定所述 SDP请求使用的媒体连接信息与所述 SDP请求中的节点信息记 录的最后一个可访问域信息中的媒体连接信息不同； 否则，
所述 ALG判断所述 SDP请求使用的媒体连接信息与所述 SDP请求 中的节点信息记录的最后一个可访问域信息中的媒体连接信息是否相 同。
7. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述前向可访 问域信息和所述后向可访问域信息均包括： 连接信息和域名信息。
8. —种 ALG, 其特征在于， 包括：
接收装置， 用于接收 SDP请求；
判断装置， 用于判断所述 SDP 请求所使用的媒体连接信息与所述 SDP请求中的节点信息中记录的最后一个可访问域信息的媒体连接信息 是否不同；
添加装置， 用于在所述判断装置的判断结果为是的情况下， 将所述 ALG的前向可访问域信息和所述 ALG的后向可访问域信息有序地添加 到所述 SDP请求中的节点信息的队尾， 在所述判断装置的判断结果为否 的情况下， 将所述 ALG的后向可访问域信息添加到所述 SDP请求中的 节点信息的队尾； 以及
发送装置， 用于发送经所述添加装置处理后的所述 SDP请求。
9. 根据权利要求 8所述的 ALG, 其特征在于， 所述 ALG还包括：
删除装置， 用于在所述判断装置的判断结果为是的情况下， 在所述 添加装置在所述 SDP请求中的节点信息中添加节点信息之前，删除所述 SDP请求中的节点信息记录的所有可访问域信息。 1/097926 根据权利要求 8所述的 ALG, 其特征在于， 在所述判断装置的判断结果 为是的情况下， 所述添加装置还用于将所述 SDP请求中的编解码器信息 包含在所述前向可访问： 信息中。
PCT/CN2010/080225 2010-02-12 2010-12-24 媒体路径优化过程中sdp请求的处理方法及装置 WO2011097926A1 (zh)

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