Research on Radio Frequency Assignment Mechanism of the RoFSO Network Based on Site-Specific Cognition and Utility Function

Abstract

For the problem of the throughput degradation and fairness deterioration of the conventional radio frequency (RF) allocation mechanism in “hot point” areas, this paper presented a novel RF allocation mechanism using radio over free space optics (RoFSO) technology. The proposed algorithm contained initial RF assignment and optimal RF assignment. The initial RF allocation was built on the distribution of adjacent remote access units (RAUs). In addition, the optimal RF allocation includes RF switching and RF scheduling, both of which were designed based on site-specific cognition of stations. Through the analysis of simulation results, we know that our proposed algorithm in RoFSO network outperform the conventional RF allocation algorithm in wireless local area network (WLAN) by 350%, 45%, and 90% for average goodput of each user, fairness index of entire network and average frame service delay (FSD), respectively.