Voice transmission in an IEEE 802.11 WLAN based access network
WOWMOM '01 Proceedings of the 4th ACM international workshop on Wireless mobile multimedia
Wireless Communications & Mobile Computing - Special Issue: Emerging WLAN Apllications and Technologies
Polling-based protocols for packet voice transport over IEEE 802.11 wireless local area networks
IEEE Wireless Communications
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VoIP over IEEE 802.11 wireless local area network (WLAN) is growing very fast and is providing a cost effective alternative for voice communications. WLANs were initially set up to handle bursty nonreal time type of data traffic. Therefore, the wireless access protocols initially defined are not suitable for voice traffic. Subsequently, updates in the standard have been made to provision for QoS requirements of data, especially the real time traffic of the type voice and video. Despite these updates, however, transmitting voice traffic over WLAN does not utilize the available bandwidth (BW) efficiently, and the number of simultaneous calls supported in practice is significantly lower than what the BW figures would suggest. Several modifications have been proposed to improve the call capacity, and recently isochronous coordination function (ICF) was introduced to mitigate the problem of low call capacity. In this paper, we propose a modified ICF which further improves the performance in terms of the call capacity. The proposed scheme uses multiplexing and multicasting in the downlink to substantially increase the call capacity.