【作者】 邢小琴； 刘凯；

【Author】 Xing Xiaoqin Liu Kai School of Electronics and Information Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China

【机构】 北京航空航天大学电子信息工程学院；

【摘要】 本文提出了一种适于 Ad Hoc 无线网络有效利用信道资源的多址接入协议,即信道选择冲突避免 (CSCA)多址接入协议。该协议在公共信道上传输 RTS/CTS 分组实现握手,采用特殊的信道选择方案选择没有冲突的业务信道传输数据分组,并且接收方成功接收到数据分组后在另一个公共信道上回复 ACK 分组。有效的信道选择方案和专用信道传输 ACK 分组相结合,有效避免了暴露终端所带来的影响。采用多信道分别进行不同通信对的业务传输也很大程度上解决了由单信道传输带来的隐藏终端问题。最后利用仿真工具 OPNET 评估了 CSCA 协议在平均信道利用率、平均分组延迟方面的多址性能。仿真结果表明,CSCA 协议在网络传输负载较重的情况,也具有较高的信道利用率和较低的分组时延。更多还原

【Abstract】 A novel multichannel multiple access protocol,namely channel selection collision avoidance(CSCA) multiple access protocol,is presented for efficient channel sharing in wireless ad hoc networks.It flexibly employs request-to-send and clear-to-send(RTS/CTS)dialogue on a common channel and selects conflict-free traffic channel to accomplish the transmission of data packet.The acknowledgment(ACK)packet for the data packet transmission is replied to the sender over another common channel,which completely eliminates the influence of exposed terminal problem.The influence of hidden terminal problem is also greatly reduced because most of possible packet collisions on a single channel are avoided due to traffic load balance on multiple channels.By using OPNET,the performance of CSCA protocol is simulated,such as average channel utilization,average message delay.Simulation results show that the CSCA protocol can achieve higher average channel utilization,lower average message delay, even though in the networks with heave load.更多还原