Ad Hoc网络中一种新的双信道MAC协议及其性能分析  

New Dual-Channel MAC Protocol for Ad Hoc Networks and Its Performance

作　　者：顾燕[1] 沈连丰[1] 邱晓华[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《应用科学学报》2006年第5期447-452,共6页Journal of Applied Sciences

基　　金：国家自然科学基金资助项目(60472053);高等学校博士学科点专项科研基金资助项目(20030286017);江苏省基础研究项目(BK2003055);江苏省科技攻关项目(BE2004008);江苏省高技术研究项目(BE2005001)

摘　　要：针对多跳ad hoc网络,提出了一种新的应用于媒体接入控制(MAC)层的双信道协议,采用双信道传输以及改进的握手协议和信道预留方法,避免了数据冲突,解决了隐藏终端和暴露终端对数据传输的影响问题,提高了信道利用率.节点根据收到的不同的控制包,在控制信道和数据信道中采取3种不同的预留方法.在数据传输中,隐藏终端能够同时接收数据,暴露终端能够同时发送数据.在高业务量网络中分析了该协议的吞吐量属性,通过与基于RTS/CTS的协议的比较,表明DCMAC协议能提高多跳ad hoc网络的吞吐量.This paper presents a new medium access control （MAC） protocol called DCMAC （dual-channel MAC） for multi-hop ad hoc networks. Dual-channel and improved handshakes as well as channel reservation are employed to avoid collision in data transmission. The hidden terminal and the exposed terminal problems during data transmission are resolved and the channel utilization is increased. Based on receiving control packets, nodes use 3 different network allocation vectors （NAV） in control channel or data channel. In the period of data transmission, the hidden terminal can receive data simultaneously and the exposed terminal can also transmit data. The throughput performance of the protocol is analyzed and evaluated in heavy traffic networks. A comparison with a RTS/CTS based protocol is given. The results show that the DCMAC protocol can improve the throughput in a multi-hop ad hoc network.

关 键 词：AD HOC网络 媒体接入控制协议 双信道 吞吐量 

分 类 号：TN92[电子电信—通信与信息系统]