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

Autor:	Yeonsik Jeong, Cheng-Lin Tsao, Raghupathy Sivakumar, Sandeep Kakumanu
Rok vydání:	2009
Předmět:	Voice over IP Computer Networks and Communications business.industry Computer science Real-time computing Testbed Access control Link adaptation Data rate Frame aggregation Hardware and Architecture business Implementation Algorithm Voice codec Software Information Systems Computer network
Zdroj:	Mobile Networks and Applications. 14:523-538
ISSN:	1572-8153 1383-469X
DOI:	10.1007/s11036-009-0157-6
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2e0abcf5dcabf395f2758055ab42e713 https://doi.org/10.1007/s11036-009-0157-6 Zobrazit plný text záznamu Full text from SpringerLink