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The Capacity of VoIP over 802.11

机译:802.11的VoIP容量

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摘要

As Voice over IP (VoIP) technology becomes a reality, service providers will be able to offer enhanced VoIP applications not presently possible with circuit-switched type networks. Combining new applications and services with the IP Multimedia Subsystem (IMS) network will increase revenue potential. The combination of wireless local area network (WLAN) technology with VoIP and IMS features could become an attractive solution for enterprise voice infrastructure. Service providers can quickly enable enterprise Voice over WLAN (VoWLAN) services, which does not require any investment in re-wiring the premise. In this paper, we introduce the VoIP architecture over WLAN, and study, through both queuing analysis and simulations, the limiting capacity of such systems when operating in the distributed coordination function (DCF) or enhanced distributed channel access function (EDCAF) mode as defined in the IEEE 802.11b/802.11e standards. Our major conclusions are that: 1) packet aggregation and using short preambles can significantly increase VoIP capacity; 2) request to send (RTS)/clear to send (CTS) message exchange does not benefit VoIP; 3) In order to support simultaneous data and voice traffic on the same carrier, it is necessary to employ EDCAF as defined in 802.11e.
机译:随着IP语音(VoIP)技术成为现实,服务提供商将能够提供电路交换型网络目前无法提供的增强型VoIP应用。将新的应用程序和服务与IP多媒体子系统(IMS)网络相结合,将增加潜在的收入。无线局域网(WLAN)技术与VoIP和IMS功能的结合可能会成为企业语音基础架构的有吸引力的解决方案。服务提供商可以快速启用企业WLAN语音(VoWLAN)服务,而无需在重新布线前提下进行任何投资。在本文中,我们介绍了WLAN上的VoIP体系结构,并通过排队分析和模拟研究了按定义的分布式协调功能(DCF)或增强型分布式信道访问功能(EDCAF)模式运行时此类系统的限制容量。符合IEEE 802.11b / 802.11e标准。我们的主要结论是:1)数据包聚合和使用短前导码可以显着增加VoIP容量; 2)请求发送(RTS)/清除发送(CTS)消息交换不利于VoIP; 3)为了在同一载波上支持同时的数据和语音流量,必须采用802.11e中定义的EDCAF。

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