Abstract
The emergence of optical wireless networks (OWNs) is a potential solution to the quest for the increasing bandwidth demand. Existing bandwidth assignment strategies are not suitable for OWNs, considering factors such as differences between the physical properties of radio networks and OWNs. In order to eliminate collision, minimize delay and enhance system utilization and fairness, we propose the non-contention bandwidth assignment protocol called adaptive polling medium access control (APMAC) protocol for OWNs. The APMAC protocol involves association, data transmission and dissociation phases. Moreover, the APMAC protocol exploits features of the IEEE 802.15.7 visible light communication (VLC) standard. While assigning bandwidth to the visible light nodes (VLNs), the visible light access point (VLAP) establishes a polling table that contains the identity, buffer size and round-trip time of each VLN that issued bandwidth request. The contents of the polling table enable the computation of the maximum transmission unit and time-slot for each VLN that requests bandwidth assignment. In order to achieve convincing results, we simulate the protocol under varying network sizes ranging from 1 to 10 VLNs per access point, then we compare the results against the medium transparent medium access control (MT–MAC) protocol that is a non-contention MAC protocol. We demonstrate numerical results of our study considering average waiting time, packet collision, system utilization and fairness. Numerical results reveal that the APMAC protocol outperforms the MT–MAC protocol.
Highlights
The high reliance on the internet is the major cause of sudden increase in new Internet subscribers.the number of Internet subscribers increases every year at unpredictable rate
The performance of visible light communication (VLC) with respect to full duplex communication is investigated in [21] where numerical results show that there is an increase of 10% in data delivery rate
The mechanism used to determine the MTU in this study considers the dynamic future knowledge maximum transmission unit (DFK-MTU) algorithm studied in [27]
Summary
The high reliance on the internet is the major cause of sudden increase in new Internet subscribers. Exploiting the visible light spectrum for signal transmission is the promising solution to the increasing internet. There are many reasons that support this argument such as significant bandwidth available in the visible light spectrum i.e., from 430 nm to 790 nm, inherent physical security, no impact on human health, low capital expenditure, and energy efficiency. Different groups such as [5,6,7,8,9,10,11,12] have demonstrated that visible light spectrum can be used for communication purpose. Results from this study demonstrate that exploiting VLC for real time systems improves communication speed.
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