Abstract

In wireless networks data are sent and received with impressive speed and ease. Mobile WiMAX is a broadband wireless solution that enables coverage of mobile and fixed broadband networks with flexible network architecture. Devised as a truly broadband access solution, the WiMAX technology offers promising features in terms of high bandwidth, extended coverage area and low cost. Despite having many advantages, WiMAX faces major research issues like QoS based bandwidth a llocation, Roaming, Internetworking with other technologies, security and handoff. Handoff occurs when a mobile user goes from one cell to another without interruption of ongoing session. Many approaches have been proposed for reducing handoff delay. In this paper, we propose a new approach by which a critical area, an area far away from serving base station but still inside the coverage of serving base station, is found. And then overlapping area between serving base stations and neighboring base station a re found and tabulated. According to the size of overlapping area, different weights are assigned where handoff threshold is changed adaptively to reduce handoff delay.

Highlights

  • In the last few years, WiMAX has been proposed as a promising wireless communication technology since it provides high data rate communications in metropolitan area networks (MANs)

  • Mobile WiMAX was the first mobile broadband wireless-access solution based on the IEEE 802.16e-2005 standard that enabled convergence of mobile and fixed broadband networks through a common wide-area radio-access technology and flexible network architecture

  • Handoff mechanism handles a mobile station switching from serving base station (SBS) to target base station (TBS). in general handoff are of two types, hard handoffs and soft handoff

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Summary

INTRODUCTION

In the last few years, WiMAX (worldwide interoperability for microwave access) has been proposed as a promising wireless communication technology since it provides high data rate communications in metropolitan area networks (MANs). First step is BS advertisement, in which the SBS periodically broadcasts information about different NBSs for handoffs by a MAC-management message called Mobile Neighbor Advertisement (MOB_ NBR_ADV).Second step is Scanning and synchronization of BSs by MS, where in order to start the scanning procedure, the MS sends a scanning interval allocation request (MOB_SCN-REQ) to the SBS containing a list of potential NBSs, selected from the MOB_NBR-ADV broadcasts. Selection of target base station takes place, in which the MS communicates a handoff request message (MOB_MSHO-REQ) to the SBS with the identity and measurement report of selected NBSs. On receiving the message, the SBS negotiates with the potential TBSs regarding QoS and other important resources to support the MS after the handoff activity. Last step is Termination of MS Contexts where, the previous SBS terminates all kinds of MS-related connections and contexts associated with them

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