| Streaming media is product with the wide band communications network and the multimedia technologies communal development. In recent years, along with correlation technique's development and the popularization, will monitor and in the emergency direction application by the video frequency Streaming media technology primarily obtains the universal attention, oneself after has become in the near future the Streaming media technology application domain except the entertainment application beside another research hot spot. At present, Internet's grade of service often cannot satisfy the Streaming media service the development demand, Streaming the media transmission technology is restricts the class media application development the most important attribute.Through studying and summarizing the domestic and foreign link aggregation technology's theory and the application present situation, has analyzed the solid fashion media data transmission characteristic and the demand, proposed face the streaming media transmission's link aggregation technology, this technology to eliminate on the transmission link the band width bottleneck and the unsafe factor has provided the cost inexpensive solution. The paper separately in two network levels, namely on the data link layer and the application layer discusses the link aggregation technology. How first did this article discuss has realized the link aggregation under the IEEE802.3 standard in the data link layer, namely the MAC link aggregation, in the technology called the Trunking technology, because the massive users visited the band width pressure which for the effective alleviation class media source near-end network faced to provide the possibility concurrently. Next, the paper proposed that realizes the multi-channel communication channel's bundle in the software application layer, namely multi-channel by the link aggregation technology, has studied some technical question which is near under the streaming media transmission technical feature, and gave has solved these technical question strategy and the method. The first question was to the link management, this article establishes a set to be suitable for the stream type transmission link management target, this set of targets used for to describe the link the first rank which dispatched, these targets had the link communication pattern, the link band width, the latency, the drop rate, the link fees, the link stably and so on. The article has given these target examination method, and has established the link target generalized analysis model, they controlled and so on for various links' aggregation and the class to provide the basis. The second of question is the transmitting end data reasonable divergence, flows the media data stream is a stratification structure mostly, each data's function and the important degree have the difference, but participates during many links the aggregation in the similar existence transmission quality difference, for this reason this article proposed a set of divergence control policy, it transfers the different data to carry on the link divergence control loyally, raised the link whole transmission efficiency. Last question is the frame loses the foreword the question, because the class media data's transmission uses the UDP agreement, can present the data frame in the data receiving end to lose the foreword the situation, but the multi-link aggregation can intensify this kind to lose the foreword, but the chaotic frame number goal will increase the serious influence to accept the end the counter-flow real-time broadcast, for this reason improved has accepted the end data the cushion processing algorithm and establishes the control frame to lose the foreword the strategy.Link aggregation oriented on streaming media transmissing proposed in this article have already been used in the wireless vehicle mobile vedio monitoring system at the monitoring command system of Guangzhou urban construction and manages, and has Obtained user's affirmation. |
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