Performance Analysis of Multi Traffic over Multi Rate EDCA of WLAN Network

Enhanced distributed channel access (EDCA) is used for transmitting good quality of service of multimedia traffic in wireless local area network (WLAN). Applications like Constant bit rate (CBR), file transfer protocol (FTP) and voice over internet protocol (VoIP) are used in wireless LAN network. Audio data is assign as high priority (AC_VO) and other such as CBR & FTP type of data are assigned as low priority (AC_BE) in IEEE 802.11b network. G.711 provides a very good perceived audio quality in comparison to other audio CODECs. The G711 codec is used in VoIP call with 20 msec of audio data. In this paper, analysis of the effects on CBR& FTP traffic with increased call rate of VOIP and payload sizes of CBR & FTP traffic in WLAN environment for real time applications are made. Jitter buffer used in RTP protocol is improving the quality of service (QoS) of multi traffic in comparison to RTP protocol without jitter buffer.