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Providing statistical QoS guarantee for voice over IP in the IEEE 802.11 wireless LANs

机译：为IEEE 802.11无线局域网中的IP语音提供统计QoS保证

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摘要

Recent years have seen greatly increasing interests in voice over IP in wireless LANs, in which the IEEE 802.11 distributed coordination function protocol or enhanced DCF protocol is used. However, since both DCF and EDCF are contention-based medium access control protocols, it is difficult for them to support the strict QoS requirement for VoIP. Therefore, in this article we propose a novel call admission control scheme that runs at the MAC layer to support VoIP services. The call admission control mechanism regulates voice traffic to efficiently coordinate medium contention among voice sources. The rate control mechanism regulates non-voice traffic to control its impact on the performance of voice traffic. Extensive simulations demonstrate that the proposed schemes can well support statistical QoS guarantees for voice traffic and maintain stable high throughput for non-voice traffic at the same time.
机译：近年来，无线局域网中对IP语音的兴趣日益增长，在无线局域网中使用IEEE 802.11分布式协调功能协议或增强的DCF协议。但是，由于DCF和EDCF都是基于竞争的媒体访问控制协议，因此它们很难满足VoIP的严格QoS要求。因此，在本文中，我们提出了一种新颖的呼叫允许控制方案，该方案在MAC层运行以支持VoIP服务。呼叫接纳控制机制可调节语音流量，以有效地协调语音源之间的媒体争用。速率控制机制可调节非语音流量，以控制其对语音流量性能的影响。大量的仿真表明，所提出的方案可以很好地支持语音业务的统计QoS保证，并同时为非语音业务保持稳定的高吞吐量。

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