无线城域网中MPEG视频传输的上行调度算法

针对现有无线城域网中MPEG视频传输的实时轮询服务算法的不足，提出了一种更为有效的媒体接入控制上行调度算法。该算法无需基站周期地提供带宽请求机会，而是在视频应用的连接建立以后，主动周期地分配固定带宽来传输视频数据的特定部分，剩余部分的带宽通过携带请求的方式获得，以此保证更好的服务质量。仿真中使用典型的视频测试源，结果表明，新算法在近似现有算法的信道利用率的情况下，具有更小的视频帧延迟和抖动。

Uplink Scheduling Algorithm of MPEG Video Transmission Based on Wireless MAN

To solve the problem of the current real-time polling service(rtPS) scheme for MPEG video transmission via wireless MAN,an efficient medium access control(MAC) uplink scheduling algorithm is presented.Without periodical bandwidth request by the base station(BS),the algorithm allocates a constant part of the bandwidth for certain fraction of the MPEG video data when the application connection is set up,and the transmission bandwidth for the remaining fraction is allocated on demand according to the piggyback request of the unsolicited grant data,thus to guarantee better quality of service(QoS).By using typical test video traces in simulation,the algorithm shows better performance in the aspects of video frame delay and jitter with similar channel utilization as the existing scheme.