Transmission priority scheme with adaptive backoff technique in fiber-wireless networks

Wan Hafiza Wan Hassan,Shabbir Ahmed,Mike Faulkner,Horace King

doi:10.1186/s13638-015-0323-4

Abstract

This paper considers the realization of fiber-wireless (Fi-Wi) networks using the gigabits passive optical network (GPON) and the infrastructure-based wireless local area network (WLAN). The bottleneck of such hybrid system is the WLAN where interference limits the performance. As such, we focus on enhancing the WLAN performance by analytically deriving the optimum contention window (CW) sizes of access points (APs) and wireless users (WUs), respectively. An adjustable transmission priority factor is introduced to allow uplink-downlink transmission fairness. Further, an adaptive backoff technique using information from monitoring the GPON and WLAN networks is proposed. Simulations show the CW sizes of all WUs are maintained within a standard deviation of 1.5% at a cost of a 3% loss in throughput due to the effect of convergence and other estimates.

Highlights

Fiber-wireless (Fi-Wi) networks combine the capacity of optical fiber networks with the ubiquity and mobility of wireless networks [1,2,3,4,5,6,7]
The low contention window (CW) causes the adapting station to hog the traffic which gives an impression to other stations that a higher number of users are accessing the channel; this is indicated by their estimates going over the actual value or n = 60
Performance evaluations show that the scheme is comparable to the adaptive window algorithm (AWA) scheme in terms of overall throughput and delay

Summary

Introduction

Fiber-wireless (Fi-Wi) networks combine the capacity of optical fiber networks with the ubiquity and mobility of wireless networks [1,2,3,4,5,6,7]. The adaptive window algorithm (AWA) proposed by Bianchi et al [22] used the number of active stations in the network to control the optimum CW size.

Results

Conclusion