Comparison between the IEEE 802.11x standards of VoIP using the CBR and VBR voice schemes

Voice over Internet protocol (VoIP) is one of the fastest growing Internet application. This paper focuses on the support of VoIP over 802.11x WLAN. A multiplexing scheme for VoIP is provided which exploits multicasting over WLAN for the downlink VoIP traffic. The 802.11x WLAN can support more than 500 VoIP sessions, but due do the inclusion of large number of over headers this ratio comes to only few VoIP sessions by using GSM 6.10 codec standard. This paper shows the VoIP standard 802.11g is the best by comparing the three standards 802.11a, 802.11b and 802.11g as well for both CBR and VBR voice sources. This has been discussed by using the features of multicast mode of WLAN by which the large overhead effects of VoIP can be reduced. This paper shows this simulation and calculations, based on multiplex-multicast scheme through which the number of VoIP sessions can be increased and determine the best VoIP standard for CBR and VBR sources.