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Saturation Throughput and Delay Performance Evaluation of the IEEE 802.11g/n for a Wireless Lossy Channel

Author: Salah A. Alabady
Journal: Iraqi Journal for Electrical And Electronic Engineering المجلة العراقية للهندسة الكهربائية والالكترونية ISSN: 18145892 Year: 2018 Volume: 14 Issue: 1 Pages: 51-64
Publisher: Basrah University جامعة البصرة


Non-ideal channel conditions degrade the performance of wireless networks due to the occurrence of frameerrors. Most of the well-known works compute the saturation throughput and packet delay for the IEEE 802.11Distributed Coordination Function (DCF) protocol with the assumption that transmission is carried out via an idealchannel (i.e., no channel bit errors or hidden stations), and/or the errors exist only in data packets. Besides, there areno considerations for transmission errors in the control frames (i.e., Request to Send (RTS), Clear to Send (CTS), andAcknowledgement (ACK)). Considering the transmission errors in the control frames adds complexity to the existinganalysis for the wireless networks. In this paper, an analytical model to evaluate the Medium Access Control (MAC)layer saturation throughput and packet delay of the IEEE 802.11g and IEEE 802.11n protocols in the presence of bothcollisions and transmission errors in a non-ideal wireless channel is provided. The derived analytical expressionsreveal that the saturation throughput and packet delay are affected by the network size (n), packet size, minimumbackoff window size (Wmin), maximum backoff stage (m), and bit error rate (BER). These results are important forprotocol optimization and network planning in wireless networks.

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