Evaluation of cross layer QoS aproachs for improving voice quality over multi-rate WLANs

The 2010 International Conference on Computer Engineering & Systems Pub Date : 2010-12-23 DOI:10.1109/ICCES.2010.5674893

M. F. Tuysuz, H. A. Mantar

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引用次数: 3

Abstract

Voice over IP (VoIP) applications over wireless local area networks (WLANs) has become increasingly popular in recent years. However, due to some performance related topics like existence of multi-rate transmission or channel conditions, it has to be placed under control continuously to prevent possible performance losses. In case of any deterioration on the wireless link conditions, IEEE 802.11 PHY/MAC specifications allow mobile nodes to select a proper transmission rate to optimize bit transmission. However, if a node selects lower transmission rate, packet losses and delays increase due to multi-rate effect. Therefore, all active calls have a general degradation. Besides, Jitter buffering is also one of the most important performance metrics of VoIP over WLANs and has to be taken into account to maximize the perceived voice quality. In this paper, we propose and evaluate our cross layer based Adaptive Codec and Frame size Modification algorithm (ACFM) with related algorithms for the optimization of maximum throughput and voice quality on multi-rate WLANs.

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提高多速率无线局域网语音质量的跨层QoS方法的评估

近年来，基于无线局域网(wlan)的IP语音(VoIP)应用日益普及。但是，由于存在多速率传输或信道条件等与性能相关的问题，必须对其进行持续控制，以防止可能出现的性能损失。在无线链路条件恶化的情况下，IEEE 802.11 PHY/MAC规范允许移动节点选择合适的传输速率来优化比特传输。但是，如果一个节点选择较低的传输速率，由于多速率效应，丢包和延迟会增加。因此，所有活动调用都有一个普遍的退化。此外，抖动缓冲也是无线局域网VoIP最重要的性能指标之一，为了最大限度地提高感知语音质量，必须考虑抖动缓冲。在本文中，我们提出并评估了我们的基于跨层的自适应编解码器和帧大小修改算法(ACFM)以及相关算法，以优化多速率wlan的最大吞吐量和语音质量。

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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The 2010 International Conference on Computer Engineering & Systems

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