Many new or modified MAC mechanisms have been proposed to reduce the risk of collision and improve system throughput. To reduce the probability of access collisions, the IEEE 802.11 WLAN adopts a carrier-sense-multiple-access (CSMA) based medium-access-control (MAC) protocol, called the distributed coordination function (DCF). This is referred to as an access collision.
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In WLAN, if more than one station (STA) attempts to transmit the packets at the same time, all the involved transmissions are usually considered to have failed on the reception at the access point (AP). It also helps to improve the service quality of cellular networks to reach an adequate standard, especially in public hotspots. In the past decades, for the highly demanding data-traffic requirement of the Internet of Things (IoT), a wireless local area network (WLAN) based on IEEE 802.11 has been commonly used in homes and offices. The simulation results demonstrate that the proposed schemes can not only remarkably improve system throughput, but also provide a fair transmission environment. To resolve this problem, this work proposes two methods: the adjustment of contention window size and the modification of probability mass function for the selection of the backoff value. However, the proposed power control scheme cannot provide a fair transmission environment even though it improves the system throughput.
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To improve system throughput, this work proposes a Differential Reception-Power Power Control scheme to take advantage of the capture effect. This phenomenon is referred to as the capture effect.
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From PHY layer perspective, when an access collision occurs, the access point can still decode the corresponding data successfully if the received signal to interference plus noise ratio is larger than the threshold. In this paper, we develop a physical/medium-access-control cross layer design to improve system throughput with the consideration of fairness for IEEE 802.11 WLAN.