Performance of the UV Multinode Network Under the Lossless Contention MAC Protocol

Abstract

Ultraviolet (UV) networks are important approaches to modern wireless communications owing to their unique characteristics, such as non-line-of-sight communication, strong anti-interference ability, and all-weather working mode. Given the lack of media access control (MAC) protocols suitable for UV networks at present, a novel UV lossless contention MAC (UVLLC-MAC) protocol is proposed herein based on UV physical properties. A fully connected finite-population multinode UV model is adopted, and its network performance is systematically derived and mathematically analyzed under the UVLLC-MAC protocol. Compared with the time-slot ALOHA protocol, the UVLLC-MAC protocol achieves 36.7% better throughputs, with 13.2% drop in packet loss rates, and the excellent performance of the protocol is obtained and fully verified. The UVLLC-MAC protocol can provide guidance for multinode and multiservice UV networking.Index Terms-multinode ultraviolet network, optical wireless communication, lossless contention access, media access control protocol. I. INTRODUCTIONLTHOUGH traditional optical wireless communication (OWC) has the advantages of large capacity, high speed, and long-distance transmission, it is difficult to set up the required automatic pointing, acquisition, and tracking (PAT) system, which is unfavorable for fast networking in complex electromagnetic environments [1]. However, ultraviolet (UV) communication networks have excellent features, such as non-line-of-sight (NLOS) communication, strong anti-interference ability, and flexible operation, in addition to the utilization of UV optoelectronic parts with small sizes, low cost, light weight, and high reliability, which have enabled UV communications to gradually gain interest in wireless networking research [2,3].At present, several studies have investigated the UV physical (PHY) layer properties and point-to-point communication systems [4][5][6][7][8][9][10][11][12][13], but there are relatively few recent studies on UV networking, especially on UV media access control (MAC) protocol. The problem of multiuser interference in NLOS UV

Enhanced Clustering MAC Protocol Based on Learning Automata for UV Networks

“…Figure 9 illustrates the UV NLOS communication model. According to our previous study [23], the communication distance of a UV terminal, according to the on-off keying (OOK) modulation, is given by: In the simulation, the communication radii of the CL and CN were 210 and 60 m, which was consistent with the lengths of the radii in the actual situation of our previous experiments [24].…”

“…Figure 9 illustrates the UV NLOS communication model. According to our previous study [23], the communication distance of a UV terminal, according to the on-off keying (OOK) modulation, is given by:…”