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为了有效利用无线Ad Hoc网络中的信道资源,提出了一种多址接入协议,即信道选择冲突避免(CSCA)协议。该协议在公共信道上发送RTS/CTS分组实现握手,采用灵活的信道选择方案选择无冲突的业务信道传输数据分组,接收节点成功接收完数据分组后在另一个公共信道上回复ACK分组。最后,利用网络仿真工具OPNET构建了CSCA协议的仿真框架,并在此基础上,通过仿真评估了协议的平均信道利用率、平均分组延迟和分组丢弃率等性能。仿真结果表明,CSCA协议在网络传输业务量重的情况下具有较高的信道利用率、较小的分组时延和分组丢弃率。
In order to effectively use channel resources in wireless Ad Hoc networks, a multiple access protocol is proposed, that is, a channel selection collision avoidance (CSCA) protocol. The protocol sends RTS / CTS packets on the common channel to implement handshake, adopts flexible channel selection scheme to select collision-free traffic channel to transmit data packets, and the receiving node replies ACK packets on another common channel after successfully receiving the data packets. Finally, the simulation framework of CSCA protocol is built by using the network simulation tool OPNET. On the basis of the simulation, the performance of average channel utilization, average packet delay and packet discard rate of the protocol are evaluated. The simulation results show that the CSCA protocol has higher channel utilization, smaller packet delay and packet discard rate when the network transmits heavy traffic.