IEEE 802.11 MAC层退避解决算法的研究
首发时间:2007-05-10
摘要:随着无线局域网(WLAN)与VoIP技术的融合,基于无线局域网的语音业务(VoWLAN)在不远的将来将会得到迅速的发展。但是,语音业务要求较高的服务质量(QoS),而目前广泛使用的IEEE802.11标准中,MAC层所使用的二进制指数退避算法(BEB)并不适合语音业务。本文提出一种新的退避算法—等待时间限制算法(WTR),用来改善无线局域网环境下语音业务的QoS。仿真结果表明新的退避算法更加有效的解决语音传输的公平性问题,减小了时延抖动。
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A research of backoff algorithm on MAC Layer of IEEE 802. 11
Abstract:As the integration of prevailing Wireless Local Area Network (WLAN) and Voice over Internet Protocol (VoIP) technology, voice over WLAN (VoWLAN) is expected to experience a growth in the near future. However, the widely implemented Binary Exponential Backoff (BEB) used in IEEE 802.11MAC mechanism is unsuitable for voice transmission with strict Quality of Service (QoS) requirements.This paper proposes a novel backoff algorithm—Waiting Time Restrict, in order to improve QoS of VoWLAN. The simulation results indicate the new algorithm is effective in relieving unfairness, reducing delay jitter and collision risk for voice transmission.
Keywords: WLAN, VoIP, MAC, QoS
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No.1274111298711787****
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