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- W14543630 abstract "Wireless voice over IP (VoIP) is an important emerging service in telecommunications due to its potential for replacing todays’ cell phone communication wherever wireless local area networks (WLANs) are deployed. However, the number of VoIP calls that can be supported in the widely deployed IEEE 802.11 WLAN is limited and therefore may hinder the success of wireless VoIP as a viable alternative. In this thesis we investigate the limited VoIP capacity and provide new insight and solutions to improve the number of simultaneous VoIP calls that can be maintained with an acceptable level of voice call quality. To improve the VoIP capacity we first discuss a solution based on a quality of service (QoS) mechanism of the IEEE 802.11 protocol. In particular we utilize a transmission opportunity (TXOP) parameter of the medium access control (MAC) as a simple solution to increase the number of VoIP calls. We develop a detailed analytical model to show that a significant increase (≈ 100%) in call capacity can be achieved. We also discuss the implications of this solution and provide ideal parameter settings to maximize the number of concurrent calls without affecting the overall system performance. Using our analytical model, we study the impact of the buffer size on VoIP capacity. We show that there exists an optimal buffer size that maximizes the number of VoIP calls, and we show that further increasing the buffer beyond this ideal value will not result in an increase in call capacity. In particular, we show that VoIP capacity is independent of the buffer size, given the minimum optimal buffer, and that this finding also holds in conjunction with the previous solution to increase the VoIP capacity. Based on this finding, we develop a closedform expression for the maximum number of VoIP calls as a function of the TXOP parameter. Using the closed-form expression we then propose a novel VoIP capacity approximation equation. This simple yet accurate approximation formula allows us to provide some further insight into VoIP capacity in WLAN and its limits." @default.
- W14543630 created "2016-06-24" @default.
- W14543630 creator A5018411272 @default.
- W14543630 date "2012-01-01" @default.
- W14543630 modified "2023-09-27" @default.
- W14543630 title "Analysis, limitations and improvements of voice over IP in IEEE 802.11 WLAN" @default.
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