一种基于区分服务的IEEE 802. 11 QoS信道访问控制机制*

南京大学学报(自然科学版) ›› 2011, Vol. 47 ›› Issue (5): 585–593.

一种基于区分服务的IEEE 802. 11 QoS信道访问控制机制*

曹磊^1,2**白光伟¹，吴志刚¹，吴艳洁¹

出版日期:2015-04-30 发布日期:2015-04-30
作者简介: (1.南京工业大学计算机科学与技术系，南京，210009;
2.南京大学软件新技术国家重点实验室，南京，210093)
基金资助:
国家自然科学基金(60673185 61073197)，江苏省自然科学基金(BK2010648)，教育部留学回国人员科研启动基
金(教外司留[2007]1108号)，江苏丫青蓝工翟中青午学术带头人培养对象(苏教师[2007]2号)，江苏省省属
高校自然科学基金(10KJB540021)，南京工业大学青年学科基金(39709007)

A QoS-aware 802 11 media access control mechanism based on differentiated services

Cao Lei ^1,2，Bui Guang-Wei ¹, Wu Zhi-Gang¹，Wu Yan一Jie¹

Online:2015-04-30 Published:2015-04-30
About author:(1. Department of Computer Science and Technology, Nanjing University of Teehnology, Nanjing, 210009，China;
2. State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, 210093，China)

摘要/Abstract

摘要： 研究表明，无线移动自组织网络具有带宽有限，信道质量不稳定，节点移动造成网络拓扑结构变化等诸多特性，这些特性严重损害了网络性能，以致在传统无线移动网络中支持具有严格Qo8要求
的多媒体应用面临严峻的挑战.木文提出了一种基于区分服务的信道接入控制机制，以更好地支持实时通信流.该机制对传统的IEEE 802. 11 DCF机制进行了部分改进，在目的节点引入了拒绝服务分组
N’I}8，使目的节点可以根据网络的状态以一定的概率h拒绝低优先级数据分组.概率h被设计为关于分组重传次数的单调递增函数，被重传次数越多，说明信道竞争越激烈，也越有必要提高低优先级数据的
拒绝概率以保护高优先级的实时数据分组.木文随后以马尔科夫链对该机制进行了建模分析，并通过相关模型的计算得出了数据流的饱和吞吐量，分组丢弃概率，饱和时延.分析结果表明该机制能够使高优
先级数据流占用更多的带宽，并且降低了高优先级数据流的端到端平均时延以及分组丢弃概率.

Abstract: Research shows that the main characteristics of wireless mobile ad hoc networks include finite bandwidth, unstable channel quality, and the change of network topology caused by node mobility.Thcsc
characteristics degrade the network performance significantly and especially identify challenges for providing QoS guarantees for real-time multimedia applications over wireless mobile ad hoc networks(MANETs).This paper
proposes a QoS-aware MAC mechanism based on Differentiated Services for MANETs，which mainly supports rcal- time data flow transfer.This mechanism makes an improvement based on traditional IEEE 802. 11 DCF mechanism.
The main idea is introducing new types of scrvic}denicd frames named NTS, which makes destination nodes refuse low-priority data with probability p，according to dynamic channel conditions.
monotonic function increasing with number of frame retransmission attempt. Probability p is designed for a As the numhcr of retransmission attempt mcrcases it indicates that the competition in channel is getting more fierce, which makes it more necessary
for protecting higlrpriority frames，by means of refusing low-priority data with higher probability. We study the behavior of several nodes with a Markov model. Using the model，we evaluate the saturation
drop probability, as well as time delay performance. Our mathematical analyses demonstrate throughput，packet that the proposed mechanism improves the performance of real-time data flow with a higlrpriority significantly, in terms of achieved
bandwidth, end-to-end dclav and frame dropping probability.

曹磊^1,2**白光伟¹，吴志刚¹，吴艳洁¹. 一种基于区分服务的IEEE 802. 11 QoS信道访问控制机制*[J]. 南京大学学报(自然科学版), 2011, 47(5): 585–593.

Cao Lei ^1,2，Bui Guang-Wei ¹, Wu Zhi-Gang¹，Wu Yan一Jie¹. A QoS-aware 802 11 media access control mechanism based on differentiated services[J]. Journal of Nanjing University(Natural Sciences), 2011, 47(5): 585–593.

参考文献

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