Media gateway, media gateway controller, multimedia telephone intercommunication method and system
A multimedia phone and media gateway technology, which is applied in the field of communication, can solve problems such as inability to adjust and adapt quality problems, quality information feedback of multimedia phone terminals, and not conducive to improving the quality of multimedia phone intercommunication communication, etc., to achieve the effect of improving communication quality
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Embodiment 1
[0050] For the established multimedia telephone intercommunication, when an MTSI (IMS multimedia telephone) terminal moves to a place where wireless users are densely populated, the bandwidth allocated to a single user will decrease due to relatively tight wireless resources. At this time, the IMS-side multimedia phone terminal detects that the network bandwidth drops, and the IMS-side multimedia phone terminal will feed back a maximum bandwidth request TMMBR request message to the MGW through RTCP, requesting the MGW to reduce the bandwidth. After receiving the maximum bandwidth request, the MGW first judges whether a video transcoder has been inserted into the session, and whether the video can be adjusted to the bandwidth requirement.
[0051] Case 1: If the session already includes a video transcoder and can adjust the video to the bandwidth requirement, then the MGW can process the video and adjust the video sending rate. Such as figure 2 As shown, the specific steps ar...
Embodiment 2
[0066] Usually, in the case of a certain bandwidth, it is necessary to select a high frame rate and low picture quality to ensure the quality of multimedia intercommunication for images with intense video content movement; High picture quality to ensure the quality of multimedia intercommunication. When it is detected that the video quality is not good, the main reason is that the frame rate and picture quality are not coordinated. At this point, the MGW first judges whether a video transcoder has been included or inserted in the session with the multimedia phone terminal on the IMS side, and judges whether the video coding can be adjusted to the requested frame rate and resolution.
[0067] If a video transcoder has been inserted into the session, and the video encoding can be adjusted to the requested frame rate and resolution, then the MGW itself will handle the process to coordinate and balance the frame rate and image resolution. The specific steps are: first, the IMS si...
Embodiment 3
[0075] When the multimedia phone terminal on the IMS side detects that the packet loss rate exceeds the upper threshold, it will feed back the detected quality information to the MGW. Adjustment.
[0076] If the communication quality can be adjusted according to the packet loss rate, the MGW itself can process the video, convert the packet loss rate into bandwidth information, and modify the encoding and frame rate according to the bandwidth information.
[0077] If the communication quality cannot be adjusted according to the packet loss rate, the MGW will convert the packet loss rate into bandwidth information and report it to the MGCF through an H.248 message, and the MGCF will feed back the maximum bandwidth information through H.245 For the H.324 multimedia telephone terminal on the CS side, the H.324 multimedia telephone terminal on the CS side modifies the encoding and frame rate according to the bandwidth information. Such as Figure 5 As shown, the specific steps ar...
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