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WiMAX是一种标准的技术，替代有线和DSL有线宽带覆盖最后一英里的无线宽带。WiMAX提供静态的，移动，便携，快速，移动无线宽带不依赖于基站是直连方式。WiMAX系统用于固定和便携接入用途，部署在3到10Km半径的小区，预计可以达到每个信道每秒40兆比特的容量。这种带宽能够同时支持100家企业采用 T-1高速连接和通过DSL高速连接的1000户家庭。移动网络部署在半径为方圆3千米的小区估计能达到每秒15兆比特容量。

 

WiMAX建立在开放的标准得到全球的监管机构和标准化组织认可，因此它将会成为“下一个大事件”。

 

问题阐述

WiMax技术的问题是如何做到与有线技术一样提供更好的服务质量。尽管WiMAX已经创建了高性能的服务架构，但是实际上超出WiMAX的覆盖范围的地方不能够保障服务的质量。

CHAPTER 1

WiMAX is a standards-based technology facilitating the provision of last mile wireless broadband access as an alternate to wired broadband similar to cable and DSL. WiMAX offers static, traveling, handy and, soon, mobile wireless broadband connectivity with no requirement for straight line-of-sight with a base station. For fixed and portable access applications, WiMAX systems can be anticipated to carry capacity of equal to 40 Mega bits per second for each channel, in a usual cell radius deployment of 3 to 10 Km. This is sufficient bandwidth to concurrently maintain 100 of businesses with T-1 speed connectivity and 1000 of homes with DSL speed connectivity. Mobile network deployments are estimated to give equal to 15 Mega bits per seconnd of capacity in a usual cell radius deployment of equal to 3 Km.

WiMAX is intended to become a 'Next Big Thing' because regulatory agencies and standards groups around the globe accept this standard and it is built on open standards.

PROBLEM STATEMENT

The problem with WiMax is to provide thebetter Quality of service equivalent to that of the wired technology. Though the WiMax has built-in quality of service architecture but in actual deployment it does not provide the promised quality of service to end users over longer distances.

OBJECTIVES
The main objectives of this thesis are to give basic understanding of this emerging technology by describing its quality of service mechanisms that are used at the PHY and MAC layers, optimizing quality of service parameters (delay, load and throughput), which will help in improving the broadband WiMAX services.

METHODOLOGY
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