doi:10.3850/978-981-08-7301-1_1383

ABSTRACT

VoIP is revolution a technology which has become a key topic in both the growing internet industry and establishes telecommunication industry. This paper focuses on the support of VoIP over 802.11b WLAN. We measured the capacity for VoIP traffic in an 802.11b and compared it with the theoretical capacity and our simulation results. 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. Specifically, we consider IEEE 802.11b systems in the infrastructure mode and find that voice capacity is a strong function of the channel bandwidth, codec packetization interval, data traffic and the packet size used by data. 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 calculations & simulation with MATLAB, based on Multiplex-Multicast Scheme through which the number of VoIP sessions can be increased and determine the best VoIP standard for CBR source.

Keywords: Capacity, Constant bit rate, Multiplex – multicast scheme, Ordinary scheme.

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