计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

一种针对树形拓扑网络的混合MAC协议

刘广钟,徐艺原   

  1. (上海海事大学 信息工程学院,上海 201306)
  • 收稿日期:2016-10-25 出版日期:2017-11-15 发布日期:2017-11-15
  • 作者简介:刘广钟(1962—),男,教授、博士,主研方向为网络通信;徐艺原,硕士研究生。
  • 基金项目:

    国家自然科学基金 (60972047);上海市教育委员会科研创新项目(S2012388)。

A Hybrid MAC Protocol for Tree Topology Network

LIU Guangzhong,XU Yiyuan   

  1. (College of Information Engineering,Shanghai Maritime University,Shanghai 201306,China)
  • Received:2016-10-25 Online:2017-11-15 Published:2017-11-15

摘要:

在树形拓扑水声传感网络中,时分多址(TDMA)机制存在信道利用率低的问题。为此,提出一种轻量级的流量自适应随机访问与TDMA的混合MAC协议。该协议在网络流量较低时采用S-ALOHA竞争机制提高信道利用率,运用最优化算法计算分配给簇内子节点的最大发送概率,通过流量自适应的灵活时隙分配机制以适应不同的网络流量。实验结果表明,该协议不仅能够提高树形拓扑网络中节点的通信效率,能减少子节点的等待时间。

关键词: 树形拓扑, 水声传感网络, 轻量级随机访问, 时分多址, 最优化算法

Abstract:

Aiming at the problem of low utilization ratio of the channel in the Time Division Multiple Access(TDMA) mechanism in the tree topology underwater acoustic sensor network,this paper proposes a hybrid MAC protocol based on improved lightweight traffic adaptive random medium access mechanism and TDMA mechanism:TAST-MAC.It adopts S-ALOHA competition mechanism effectively to improve the channel utilization when the network traffic is low.This protocol uses an optimization algorithm to calculate the maximum transmission probability table values which are assigned to the cluster sub nodes,and uses a flexible traffic adaptive slot allocation mechanism to adapt different network traffic situation.Experimental results show that TAST-MAC not only improves the communication efficiency in the tree topology networks,but also reduces the waiting time of the sub nodes.

Key words: tree topology, underwater acoustic sensor network, lightweight random access, Time Division Multiple Access(TDMA), optimization algorithm

中图分类号: