软件TDMA VoIP应用在IEEE802.11无线局域网

IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications Pub Date : 2007-05-01 DOI:10.1109/INFCOM.2007.282

F. Guo, T. Chiueh

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引用次数: 26

摘要

企业无线局域网(wlan)的一个新兴杀手级应用是IP语音(VoIP)电话，它有望以低成本大大提高企业电话服务的可达性和移动性。大多数基于IEEE802.11 wlan的商业VoIP产品不能在单个IEEE 802.11b信道上支持超过10个语音会话，即使其峰值传输速率比单个VoIP连接的带宽要求高出两个数量级以上。这些VoIP系统的有效容量低于预期的主要原因有两个:严格的延迟要求和大量的每个wlan数据包开销。时分多址(TDMA)是一种众所周知的技术，它提供了每个连接的QoS保证，并最大限度地提高了无线信道的利用效率。本文提出了一种基于软件的TDMA (STDMA)协议，该协议旨在支持VoIP应用，并成功地在商用IEEE802.11 WLAN接口上工作。由此产生的STDMA原型可以在单个IEEE 802.11b信道上支持50多个双向G.729语音会话。

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Software TDMA for VoIP Applications Over IEEE802.11 Wireless LAN

An emerging killer application for enterprise wireless LANs (WLANs) is voice over IP (VoIP) telephony, which promises to greatly improve the reachability and mobility of enterprise telephony service at low cost. Most commercial IEEE802.11 WLAN-based VoIP products cannot support more than ten voice conversations over a single IEEE 802.11b channel, even though its peak transmission rate is more than two orders of magnitude higher than an individual VoIP connection's bandwidth requirement. There are two main reasons why these VoIP systems' effective capacity is lower than expected: stringent latency requirement and substantial per-WLAN-packet overhead. Time-Division Multiple Access (TDMA) is a well-known technique that provides per-connection QoS guarantee as well as maximizes the radio channel utilization efficiency. This paper presents a software-based TDMA (STDMA) protocol that is designed to support VoIP applications and successfully works on commodity IEEE802.11 WLAN interfaces. The resulting STDMA prototype can support more than 50 two-way G.729 voice conversations over a single IEEE 802.11b channel.

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IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications

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