一种面向MAC的Ad Hoc网络时延模型分析  

Model Analysis of MAC-Oriented Delay in AdHoc Networks

作　　者：付锐兵[1] 石中华[1] 

机构地区：[1]西安电子科技大学ISN 实验室,陕西西安710071

出　　处：《电子科技》2007年第11期43-45,54,共4页Electronic Science and Technology

摘　　要：在Ad Hoc网络中,时延主要是介质接入冲突造成的。为了更好地分析Ad Hoc网络,提出了一种面向MAC的Ad Hoc时延(MAC-Orient Delay Model)模型。该模型通过深入研究Ad Hoc网络的MAC接入机制,得出MAC时延主要包括传输时延和冲突退避等待时延。传输时延是介质接入时数据传输的时间,是必需的;而退避等待是接入冲突产生的,由冲突退避机制决定。由Ad Hoc采用的CSMA/CA的二进制退避算法,得到了MAC时延。仿真结果表明,该模型简单有效。基于该模型,分析了如何减小时延等,为解决负载均衡等问题指明了方向。Delay results from the collision of media access in the Adhoc network. For a better analysis of the Adhoc, a MAC - Orient Delay Model is proposed. A thorough study of the MAC access mechanism reveals that the MAC delay is composed of propagation delay and collision retreat waiting delay. Propagation delay is the time used for data transmission and therefore is necessary while be retreat waiting delay results from collision and is determined by collision retreat mechanism. The MAC delay is obtained by using CSMA/CA, which is adopted by Adhoc. Simulation results show that this model is efficient. Based on this model, this paper also analyzes how to minimize delay, paving the way for load equalization.

关 键 词：AD HOC 时延 模型 邻节点个数 

分 类 号：TN915[电子电信—通信与信息系统]