无线Ad Hoc网络中CSCA协议的仿真研究

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。

Simulation Study of CSCA Protocol for Wireless Ad Hoc Networks

A novel multiple access protocol, namely channel selection collision avoidance (CSCA) protocol, was proposed for efficient channel sharing in wireless ad hoc networks. It employed request-to-send and clear-to-send (RTS/CTS) dialogue between the sender and recipient of a data packet on a common channel and selected conflict-free traffic channel to accomplish the transmission of data packet by a flexible channel selection scheme. Meanwhile, the recipient of data packet replied an associated acknowledgment (ACK) for the sender over another common channel. By using OPNET, the simulation framework of CSCA protocol was developed, and based on this, its average channel utilization, average message delay and message dropping rate were evaluated. Simulation results show that the proposed protocol can achieve higher average channel utilization, lower average message delay and packet dropping rate in the present of heavy offered load.