QUALITY OF SERVICE (QOS) IN WI-MAX

Abstract

This paper is mainly concern with Quality of service in WI-MAX technology. WI-MAX is providing broadband wireless access to the masses and presenting alternatives to digital subscriber lines (DSL) and cable broadband access. WI-MAX is based on IEEE 802.16 standard and is scalable. Super narrow lanes can enables a lot of traffic over them without disturbance. Many technologies and softwares like pathloss4.0,Global Mapper are used for line of sight (LOS) clearance coverage; the technology behind WI-MAX has been optimized to provide excelled non-line of sight (NLOS) coverage.QOS in broadband wireless access is a difficult and complicated business, as it adds an unpredictable radio link and potentially heavy user contention to the usual non-deterministic behavior of IP packet networks. Carriers therefore need to be aware of how QOS works – and what it can do – in the different flavors of 802.16, and how it relates to the more familiar 3G technologies. WiMAX quality of service (QOS) depends crucially on the 802.16 Layers 1 and 2, as these govern the all-important base-station/user-terminal radio access – an inherently difficult environment compared to, say, a wireline broadband network. Because the d/e forms of 802.16 are aimed at different applications – fixed terminals only and mobile terminals, respectively – there are significant differences in technology between them. In particular, 802.16d used Orthogonal Frequency Division Multiplexing.