VoIP over Multiple IEEE 802.11 Wireless LANs
A. Chan, S. C. Liew

TL;DR
This paper examines the severe limitations of VoIP over multiple IEEE 802.11 WLANs and proposes novel solutions like clique-analytical call admission and CoTDMA to significantly enhance capacity.
Contribution
It introduces a conflict graph-based call admission scheme and applies CoTDMA with 802.11 CSMA, achieving substantial capacity improvements in multi-WLAN environments.
Findings
VoIP capacity is severely limited in multi-WLAN scenarios.
Clique-analytical call admission increases capacity by over 50%.
CoTDMA further boosts capacity by 35%.
Abstract
Prior work indicates that 802.11 is extremely inefficient for VoIP transport. Only 12 and 60 VoIP sessions can be supported in an 802.11b and an 802.11g WLAN, respectively. This paper shows that the bad news does not stop there. When there are multiple WLANs in the vicinity of each other, the already-low VoIP capacity can be further eroded in a significant manner. For example, in a 5-by-5, 25-cell multi-WLAN network, the VoIP capacities for 802.11b and 802.11g are only 1.63 and 10.34 sessions per AP, respectively. This paper investigates several solutions to improve the VoIP capacity. Based on a conflict graph model, we propose a clique-analytical call-admission scheme, which increases the VoIP capacity by 52% and 37% in 802.11b and 802.11g respectively. If all the three orthogonal frequency channels available in 11b and 11g are used, the capacity can be nearly tripled by the…
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Taxonomy
TopicsWireless Networks and Protocols · Mobile Ad Hoc Networks · IPv6, Mobility, Handover, Networks, Security
