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应用科学学报 >

2012 , Vol. 30 >Issue 1: 31 - 38

DOI: https://doi.org/10.3969/j.issn.0255-8297.2012.01.006

通信工程

一种支持拥塞识别的ad hoc网络DCF协议速率自适应机制

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  • 1. 南京航空航天大学电子信息工程学院，南京210016
    2. 中国电子科技集团公司第28研究所，南京210007
雷磊，博士，副教授，研究方向：无线通信网络、协作通信技术，E-mail: leilei@nuaa.edu.cn

收稿日期: 2011-04-12

  修回日期: 2011-06-16

  网络出版日期: 2012-01-30

基金资助

国家自然科学基金(No.61100195, No.61003116)；教育部博士点基金(No.20103218120022)；航空科学基金(No.20090152001,No.20110112003)；中国博士后科学基金(No.20110491412)；江苏省自然科学基金(No.BK2010263)；南京航空航天大学基本科研业务费专项科研项目基金(No.NS2010100, No.NP2011010)资助

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Rate Adaptive Mechanism with Congestion Awareness of DCF Protocol in Ad Hoc Networks

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  • 1. College of Electronic and Information Engineering, Nanjing University of Aeronautics
    and Astronautics, Nanjing 210016, China
    2. The 28th Research Institute, China Electronic Technology Corporation, Nanjing 210007, China

Received date: 2011-04-12

  Revised date: 2011-06-16

  Online published: 2012-01-30

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摘要

摘要：分析了IEEE 802.11 DCF协议虚拟载波检测机制在支持多速率传输方面存在的局限性，以及高速率传输
数据分组的重负载条件下多跳ad hoc网络的节点拥塞问题，并在DCF协议框架内提出了一种支持拥塞识别的速率
自适应机制. 该机制允许接收节点根据信道质量选择可用的最高传输速率，并把此速率值和自身的拥塞状况反馈
给发送节点，发送节点根据接收节点的拥塞状况决定发送或退避等待. 仿真结果表明，该机制能有效解决ad hoc网

关键词： ad hoc网络; DCF协议; 多速率; 拥塞识别

本文引用格式

雷磊1;2， 周进华1， 朱颖锋1， 刘维康1 . 一种支持拥塞识别的ad hoc网络DCF协议速率自适应机制[J]. 应用科学学报, 2012 , 30(1) : 31 -38 . DOI: 10.3969/j.issn.0255-8297.2012.01.006

Abstract

Abstract: We show why the carrier sense mechanism defined in IEEE 802.11DCF protocol does not support
adaptive multi-rate transmissions in a physical layer, and study the congestion problem in high speed and heavy
loaded multi-hop ad hoc networks. We then propose a rate adaptive mechanism with congestion awareness
of DCF protocol to overcome the congestion problem. According to the channel condition, the receiver can
choose the highest feasible transmission rate, and sends its chosen rate value and congestion information back to the sender. Based on the feedback information from the receiver, the sender can decide whether to transmit data packets or not. Simulation results show that the proposed protocol can effectively solve the congestion problem, and significantly improve the overall throughput of the network.

Key words： ad hoc networks; DCF protocol; multi-rate; congestion awareness

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