Traffic Sensitive and Traffic Load Aware Path Selection Algorithm For MMR WIMAX Networks

摘要

The recent developments in the broadband wireless access (BWA) communication systems have introduced several major changes to the existing systems. Legacy IEEE 802.16j is one such amendment to the existing IEEE 802.16 WiMAX family. The key modification introduced by 802.16j system is theudconcept of relay station (RS), which may be used to enhance the system coverage or to make system throughput optimal. The end terminals, subscriber stations (SS) are unchanged in the standard. The overall change pertinent to the system has raised many unresolved issues related to RS and multi-hopudrelay base station (MR-BS). The selection of path from a SS to MR-BS via a RS is also one of the issues,udneed to be addressed. The path selection of a SS in both uplink and downlink directions is left open in theudstandard. It is very significant to satisfy the traffics of stringent quality of service (QoS) requirements andudto appropriately manage the resources of a cell under different circumstances. This paper proposes audpath selection algorithm to achieve the aforementioned qualities in the network. The path selectionudmetrics include traffic load of the transparent relay station and traffic sensitivity factor of the SS. Anudextensive simulation work discusses the performance evaluation of the proposed work using QualNet simulator.