VoIP over Wi-Fi Networks: Performance Analysis and Acceleration Algorithms

被引：1
作者：
Jeong, Yeonsik [1 ]
Kakumanu, Sandeep [2 ]
Tsao, Cheng-Lin [2 ]
Sivakumar, Raghupathy [2 ]
机构：
[1] SungKongHoe Univ, Dept Multimedia Syst Engn, Seoul, South Korea
[2] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
来源：
MOBILE NETWORKS & APPLICATIONS | 2009年 / 14卷 / 04期
基金：
新加坡国家研究基金会; 美国国家科学基金会;
关键词：
VoIP; Wi-Fi networks; call capacity; ACK aggregation; frame aggregation; link adaptation;
D O I：
10.1007/s11036-009-0157-6
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
The expected VoIP call capacity in a one hop IEEE 802.11b network with G. 711 voice codec is about 85 simultaneous calls, but the actual observed capacity is only 5 calls even at the highest data rate and under zero loss conditions. In this paper we analyze the reasons behind this inferior performance of VoIP traffic. We also present algorithms at the medium access control layer to improve the observed call capacity. Using ns-2 based simulations, we evaluate the algorithms and show that performance improvements of more than 300% can be achieved. Finally, using a testbed implementation of one of the proposed algorithms, we show its feasibilty in real world VoIP implementations.
引用
收藏
页码：523 / 538
页数：16
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