QOS performance analysis of a survivable fiber wireless access network through an efficient backup onu algorithm

Abstract

The recent advancements in internet applications increase the newlinebandwidth requirements and unthreaded connectivity to end users. Wireless and newlinewired networks are required by the telecommunication industry to satisfy user newlinedemands. Fiber Wireless access network (FiWi) utilizes the best features of both newlinePassive Optical Networks (PON) and Wireless Mesh Networks (WMN), which newlineprovides uninterrupted services to subscribers at any time and everywhere newlinemanner. The network survivability against fiber failure is a key issue in the newlinedesign of a FiWi access network. All link failures are not similar. The network newlinefailure probability is influenced by the place where it occurs (nodes, fibers, newlineOptical Network Unit (ONU), Optical Line Terminal (OLT). The network newlinereliability can be achieved through optimum placement of backup fiber and newlinebackup ONU deployment with efficient rerouting and dynamic bandwidth newlineallocation procedures. The segment failures caused by feeder fiber cuts affect newlinehuge data traffic in both up/down stream resulting poor QoS performance. newlineThe traffic rerouting in FiWi gained more attention due to bandwidth disparities newlinein frontend WMN and backend PON. In such scenario Backup ONU plays a newlinemajor role in efficient rerouting and traffic recovery. During single segment newlinefailure, backup ONU takes in-charge of failed segment and the interrupted traffic newlineis carried over through backup fibers to all neighboring segment and it requires a newlinererouting procedure aware of delay, capacity, shortest path, flow and multipath newlinecapabilities. A new Automated Fault Detection and ReRouting algorithm newline(AFDRR) is proposed that identifies fault occurrences and reroutes data traffic to newlinenearby ONUs based on their residual capacities. A single segment failure newlinescenario is designed using FiWi with a single OLT network known as Wireless newlineOptical Broadband Access Networks (WOBAN). Its performance is analyzed in newlineWi-Fi, WiMax, and UMTS environments by injecting wireless node failures, newlinedistribution fiber and feeder fiber cuts, ONUs and an