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Method and device for processing SDP (Session Description Protocol) request in media path optimizing process

A media path and optimization process technology, applied in the field of communication, can solve problems such as inability to judge, communication failure, and optimization of media path errors, and achieve the effect of ensuring normal communication and easy implementation.

Active Publication Date: 2011-08-17
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, UE1 uses codec a to send media to TrGW1 controlled by ALG1, TrGW1 forwards the media to TrGW4, TrGW4 forwards the media to UE2, and UE2 chooses to use codec c to receive the media, and the result cannot be decoded; otherwise, UE2 uses codec c Send media to TrGW4 controlled by ALG4, TrGW4 forwards the media to TrGW1, TrGW1 forwards the media to UE1, and UE1 chooses to use codec a to receive the media, so it cannot be decoded, resulting in communication failure
[0017] It can be seen that, in the related art, in the process of media path optimization, it is impossible to determine whether the path of the SDP request includes an ALG that does not support the optimization algorithm, resulting in an error in the final optimized media path, and the error Optimizing the media path can also cause communication failures

Method used

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  • Method and device for processing SDP (Session Description Protocol) request in media path optimizing process
  • Method and device for processing SDP (Session Description Protocol) request in media path optimizing process
  • Method and device for processing SDP (Session Description Protocol) request in media path optimizing process

Examples

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Embodiment 1

[0074] Figure 7 shown as corresponding to Figure 6 The flowchart of the embodiment of the present invention mainly comprises the following steps:

[0075] Step 701, UE1 sends an SDP request to UE2 to negotiate media resource information, such as by sending SIP call signaling, that is, an INVITE (invitation) request, and carries the SDP request in the message body of the SIP request, and the content of the SDP request is UE1's media resource information;

[0076] Steps 702-703, the SDP request arrives at the signaling gateway ALG1, and the signaling gateway ALG 1 selects TrGW1 as the media gateway, and ALG1 first judges whether the connection information in the last accessible domain in the node information recorded in the SDP request is consistent with that in the SDP request. Similarly, there is no node information in this example, and then judge whether there are directly connected nodes in the node information recorded in the SDP request. In this example, there is no no...

Embodiment 2

[0087] Figure 8 shown as corresponding to Figure 6 The flowchart of the embodiment of the present invention mainly comprises the following steps:

[0088] Step 801, UE1 sends an SDP request to UE2 to negotiate media resource information, such as by sending SIP call signaling, that is, an INVITE (invite) request, and carries the SDP request in the message body of the SIP request, and the content of the SDP request is UE1's media resource information;

[0089] Steps 802-803, the SDP request arrives at the signaling gateway ALG1, and the signaling gateway ALG1 selects TrGW1 as the media gateway, and ALG1 controls the media gateway to use the media resource information in the SDP request, and allocates media resources for the connection backward, and ALG1 uses TrGW1's media resource information used to connect backward replaces the media resource information in the SDP request. ALG1 judges whether the connection information in the last accessible domain in the node information...

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Abstract

The invention discloses a method and device for processing an SDP (Session Description Protocol) request in a media path optimizing process, wherein the method comprises the steps: an ALG (Application Layer Gateway) receives an SDP request; the ALG determines that media connection information used by the SDP request is different from media connection information in the last addressable domain information in node information in the SDP request; and the ALG orderly adds the forward addressable domain information and the backward addressable domain information to a queue tail of the node information in the SDP request, and then sends the SDP request. According to the invention, a media path can be correctly optimized and normal communication is ensured.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for processing SDP requests during media path optimization. Background technique [0002] IP Multimedia Core Network Subsystem (IMS for short) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP for short). business environment, supports multimedia applications, and can provide users with rich multimedia services. [0003] Figure 1A It is a schematic diagram of IMS media path optimization in the related art, describing different media paths and corresponding signaling paths between the IMS calling terminal UE1 and the IMS called terminal UE2. Such as Figure 1A As shown, the media path established in the existing call process is: UE1, transmission gateway (Transmit Gateway, referred to as TrGW) 1, TrGW2, TrGW3, TrGW4, UE2, and the optimized media path is: UE1, TrGW1, TrGW4, In UE2, the optimized media path is sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/02H04W80/10H04L29/06
CPCH04L29/06326H04L65/103H04L29/12009H04L65/1016H04L65/1006H04L63/02H04L61/2546H04L61/00H04L65/1069
Inventor 谢振华
Owner ZTE CORP
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