Delay Analysis of IEEE 802.11e EDCA Under Unsaturated Conditions

Jing Liu, Z. Niu
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引用次数: 16

Abstract

With the successful development of IEEE 802.11 based wireless LAN(WLAN), applications with QoS requirements are asked to be provided in WLANs. Because of their delay restrictions, realtime applications should work under unsaturated conditions. In this paper, firstly, traffic models for different kinds of applications are proposed to convert the unsaturated system into an equivalent saturated system and calculated out the queueing delay in the sender buffer; then, a new analysis model is presented to analyze the backoff delay and packet loss rate of all kinds of applications under the IEEE 802.11e enhanced distributed channel access (EDCA), this model well embodies the function of the arbitration inter frame space(AIFS) and other EDCA parameters; finally, access delay can be get from the backoff delay and queueing delay. Practical scenarios of voice over IP(VoIP) and data combined system are simulated. Simulation results show the accuracy and efficiency of our model under unsaturated conditions.
IEEE 802.11e EDCA在非饱和条件下的时延分析
随着基于IEEE 802.11的无线局域网(WLAN)的成功发展,要求在WLAN中提供具有QoS要求的应用。由于它们的延迟限制,实时应用应该在不饱和条件下工作。本文首先提出了不同类型应用的流量模型,将不饱和系统转化为等效的饱和系统,并计算出发送端缓冲区的排队延迟;然后,提出了一种新的分析模型来分析IEEE 802.11e增强分布式信道接入(EDCA)下各种应用的回退时延和丢包率,该模型很好地体现了仲裁帧间空间(AIFS)和其他EDCA参数的作用;最后,从回退延迟和排队延迟中得到访问延迟。对IP语音(voice over IP, VoIP)和数据组合系统的实际场景进行了仿真。仿真结果表明了该模型在非饱和条件下的准确性和有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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