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dy of the related topics and literature.
Designing the different simulation based practical model scenarios of a WiMax network to simulate different QoS parameters (latency, jitter, delay, throughput etc) that may affect the QoS in wireless networks.
Model based solution will be proposed which will address these QoS parameters and the obtained results will optimize the performance of the network derived from different designed simulation models.

ORGANIZATION of the THESIS
This thesis consists of six chapters. Chapter 2 contains the detailed introduction of the standard IEEE 802.16 (WiMax), the different versions of the standard IEEE 802.16, its operation modes, and the protocol architecture of 802.16. Chapter 3 describes the usage models (fixed and portable), the features and the usage scenarios. The WiMAX standard addresses a broad variety of applications and usage scenarios which are assembled into 2 large categories, private networks and public networks. Chapter 4 describes the QoS mechanisms precise to 802.16. It explains how QoS is provisioned in 802.16. It also equates the QoS abilities of 802.16 with the rival technologies. Chapter 5 discusses the WiMAX network simulation scenarios developed in OPNET 14.5 simulation tool. Chapter 6 concludes the results obtained.

CHAPTER 2
LITERATURE REVIEW and INTRODUCTION to WIMAX (IEEE 802.16)  WIMAX的文献回顾和引言

2.1 LITERATURE REVIEW
2.2 INTRODUCTION
The IEEE 802.16 Working Group on Broadband Wireless Access Standards was initiated in a meeting held by the National Institute of Standards and Technology (NIST). The working group has formed new standards for broadband wireless metropolitan area networks. The 1st edition of the IEEE 802.16 standard is 802.16-2001 agreed in December 2001 and in print in April 2002.

The IEEE 802.16 standard and its amendments describe the air interface specifications together with a common MAC layer and physical layers (PHY) dealing with the Data Link layer and Physical layer of Open Systems Interconnection (OSI) model [4]. The standards cover frequency ranges of 2-66 GHz, both licensed and license-exempt bands. The channel access method supports both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).

At the beginning, the intend of IEEE 802.16 Media access control layer was to support PMP broadband wireless access (BWA) system. Later Mesh mode is added to support operating in mesh networks. It is anticipated to address high bit rate communications with various services. The IEEE Std 802.16 [5] defines three MAC sub-layers.

Service-specific Convergence Sub-layer (CS)
The Service-specific CS receives exterior network data via the convergence sub-layer SAP, transforms the data to media access control SDUs, and sends the media access control SDUs to the media access control service access point. The categorization of upper-layer protocol data units (PDUs) and sending those PDUs to the proper media access control service access point is the its key task. The standard specifies convergence sub-layer for ATM and packet-based protocols. The supported packet-based protocols are IEEE 802.3 standard/Ethernet, IEEE standard 802.1Q-1998 virtual local area network (VLAN), and Internet Protocol (IP), both IPv4 and IPv6[5].

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