100 Throughput Analysis of Active Node Back-Off Algorithm for AIFS QoS WLAN

This paper, we propose a new technique for calculated Contention Window (CW) size for backoff algorithm mode. We use maximum function theory for improved performance of contention window algorithms for IEEE802.11e quality of service (QoS) wireless local area network (WLAN). The proposed algorithm is named as Active Node Back-off Algorithm (ANBA). The performance of ANBA is compared with the legacy back-off algorithms as Binary Exponential Back-off (BEB) and Estimation Based Back-off (EBB) algorithm. The throughput and fairness index of ANBA is analyzed in arbitration inter-frame space (AIFS) priority technique in enhanced distribute channel access function (EDCAF). In this research, the channel access scheme is based on carrier sense multiple access collision avoidance with request-to-send and clear-to-send (CSMA/CA RTS CTS) protocol. Our numerical results show that the performance of ANBA algorithm is better than old back-off algorithm in terms throughput and fairness index parameters.