高速无线个域网多视频流信道时间分配算法

Channel time allocation for multiple video streaming over highrate WPANs

研究了视频传送时的信道时间分配问题.根据视频帧的不同重要性和长度等,预留不同带宽,从而加强公平性.同时利用不同方法对不同重要程度的视频帧进行差错保护,从而提高实时视频业务的性能.在此基础上,提出了一种保证服务帧率公平的高优先级帧最小瞬时权重优先的信道时间分配算法.仿真表明:所提算法较已有算法在同等公平性下可解帧率平均提高5%,在网络负载严重的情况下能提高11%.

High-rate wireless personal area network defined by IEEE 802. 15.3 is aimed at the use of multimedia in future to provide a high data rate and flexible wireless connection with high QoS （quality of service）. Although this network can support personal multimedia applications theoretically, there are still many problems need to be solved. The channel time allocation with transmitting video stream was studied. According to the importance and video frame lengths, the channel time was allo- cated to enforce the fairy and the high video performance of the application achieved by different methods to realize the error protection of the different frames. From the idea above, the algorithm for an instantaneously higher-priority shortest weighted cost first channel time allocation was proposed to improve the fraction of the decodable frames. Simulation results showed that the decodable frame of the proposed algorithm has increased about 5 % than that of previous one under the same fairness, especially 11% when the load of the network becomes heavy.