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无线局域网支持实时业务的研究 总被引:1,自引:0,他引:1
在分析当今两大主流无线局域网MAC层机制的基础上研究了无线局域网对实时业务的支持,分析了不同媒体接入策略对实时业务的影响。 相似文献
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准确的网络带宽测量对许多互联网应用和协议至关重要.现有带宽测量工具如Pathchar,Bing和Bprobe都假定链路对称.但ADSL、cable modem和卫星链路等的广泛存在,使测量必须考虑非对称链路.本文提出了一种新的非对称链路测量算法(ALBMA,Asymmetric Link Bandwidth Measurement Algorithm),来测量一条路径上各链路的双向带宽,并采用核密度评估算法过滤测量噪声.仿真验证了测量和滤波算法的有效性.与先前算法相比,ALBMA具有相近的测量精度,但测量速度更快,并且耗费网络资源少. 相似文献
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IEEE 802.11 Medium Access Control (MAC) is proposed to support asynchronous and time bounded delivery of radio packets. Distributed Coordination b-kmction (DCF), which uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and binary slotted exponen-tial backoff, is the basis of the 802.11 MAC. This paper proposes a throughput enhancement for DCF by adjusting the Contention Window (CW) setting scheme. Moreover, an analytical model based on Markov chain is introduced to compute the enhanced throughput. The accuracy of the model and the enhancement of the proposed scheme are verified by elaborate simulations. 相似文献