基于WIA-PA的无线总线多信道调度算法

针对无线总线替代有线总线所带来的网络实时性和吞吐量下降的问题,充分利用无线信道提供的众多信道,在媒体接入控制(media access control,MAC)层提出了一种多信道调度算法。该算法在星型拓扑下将每个通信周期分为载波侦听多路访问(carrier sense multiple access,CSMA)阶段和时分多址(time division multiple access,TDMA)阶段。在CSMA阶段,基于不同优先级的灵活接入使得节点间发生碰撞的可能性大大降低。在TDMA阶段,基于全局队列的最早截止时间优先(earliest deadline first,EDF)调度使得信道利用率明显提高。仿真结果表明:提出的多信道MAC调度算法可以有效提高网络的实时性和吞吐量。

Wireless bus multi channel scheduling algorithm based on WIA-PA

Wireless bus system can not achieve the same performance of transmission delay and throughput when compared with the wired one. A multi channel media access control (MAC) protocol is proposed. The protocol takes advantage of the coexistence of the multiple channels provided by the wireless channel. The operation of the proposed protocol consists of the carrier sense multiple access (CSMA) session and the time division multiple access (TDMA) session in the star topology. During the CSMA session, priority based access greatly avoids collision. During the TDMA session, the earliest deadline first (EDF) scheduling based on the global queue achieves better channel utilization. Simulation results indicate that the proposed multi channel MAC protocol achieves better performance of transmission delay and throughput.