| Features of real-time streaming are:dynamic data, size of data can not be predicted,real-time, high transmission delay and jitter requirements,data volume,requiring highe throughput. Multi-connection real-time streaming system is used for real-time audio and video calls, it’s buffing time is very short, the communication ends must be consistent and not like the traditional multi-connection applications streaming that requires media data as waiting until the transfer is complete and correct use. Multi-connection transmission can compensate for the short comings polylinker single transmission over a connection,and maximize the effective bandwidth of the plurality of polymeric networks, real-time dynamic adjustment of the transfer amount of each link, the maximum efficiency of transmission of streaming media files, thereby increasing the effective bandwidth utilization is connected provide better audio and video enjoyment and QoS.Multi-connection soft terminal includes three units:over all control module, multi-connection signal controling control unit and multi-connection transmission unit. Overall control module at the interface between the module and the presentation logic module, and bridge logic processing core of the system, multi-connection signal controling unit is responsible for negotiations, multi-connection transmission unit is responsible for completing transmission of the media stream.Multi-connection signal controling control unit is core of the paper, we use SIP and SDP to negotiate multi-connection sessions, SIP protocol is used to complete the call controlling functions such as call holding, call routing, call transfering, media conversion, which is completely in accordance with the RFC3261standard SIP signaling format, the SDP protocol will need to be expanded,by extending SDP protocol, the multi-connection address information, media types, codecs, multi-connection communication strategy could be transtered to the end, thus establishing multi-connection sessions. |
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