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

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.

Idle sense with transmission priority in fibre‐wireless networks

“…The variable m is estimated from the GPON frame format information as described in Section 2 and the constant α can be obtained by solving 1 − α = (1 − (T slot /T c ))e −α , a minimised cost function derived in [26]. Then, from (8), we have p ap = β β + km (13) and from (2), we have…”

“…On the wireless side, the work in [10,11] proposed wireless mesh networks to provide network survivability and the work in [12] opted to integrate with the WiFi function in small cell backhaul to avoid the huge data loss and traffic outage when a distribution fibre is broken. Similarly, the work in [13] proposed FiWi networks by integrating gigabits passive optical network (GPON) as a small cell backhaul with a 'closed' infrastructure wireless local area network (WLAN) in the wireless side, as shown in Fig. 1.…”

“…GPON frame format[13,31].Shaded frames are non-encrypted and can be accessed by all ONTs. Circled subfields are used as potential estimates IET Commun., 2020, Vol.…”