载波监听双信道接入协议性能分析  

Performance analysis of carrier sensing based dual channel access protocol

作　　者：赵志峰[1] 郑少仁[2] 仇佩亮[1] 

机构地区：[1]浙江大学信息科学与工程学院,浙江杭州310027 [2]解放军理工大学通信工程学院,江苏南京210007

出　　处：《浙江大学学报（工学版）》2005年第9期1301-1305,共5页Journal of Zhejiang University：Engineering Science

摘　　要：为了解决Ad Hoc网络由隐终端和暴露终端引起的数据报文冲突问题,提出了基于载波监听的双信道多重接人(DCMA)协议.载波监听DCMA协议通过使用载波监听和忙指示(BI)控制报文来解决数据报文冲突问题.将忙期/闲期理论应用于双信道接入协议性能分析,对全互联网络中载波监听DCMA协议的信道利用率进行了建模分析,并通过软件仿真研究了复杂网络拓扑下载波监听DCMA协议的吞吐量.分析结果表明,载波监听DCMA的信道利用率要高于报文监听DCMA协议.在高负载情况下,载波监听DCMA的吞吐量比报文监听DCMA协议和单信道接人协议的吞吐量提高了近50%.To resolve the data packet collision caused by hidden and exposed terminals in Ad Hoc network, a carrier sensing protocol based dual channel multiple access （DCMA） was proposed. Carrier sensing and busy indication （BI） control packets were presented, and busy/idle period theory was used to analyze the performance of dual channel access protocol. Channel utilization ratio of carrier sensingDCMA under fully connected network was theoretically investigated, and the throughput of carrier sensing DCMA under corn plex network topology was studied through software simulation. Results show that the performance of carrier sensing DCMA is much better than that of packet sensingDCMA. Throughput of carrier sensingDCMA is improved almost 50% compared with single channel access protocol and packet sensing DCMA under heavy load.

关 键 词：AD HOC网络 信道接入协议 载波监听 双信道 

分 类 号：TN925.93[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]