Combined Vertical Handoff Decision Algorithm & Call Admission Control In WLAN-UMTS Hybrid Networks.

Date of Submission

December 2013

Date of Award

Winter 12-12-2014

Institute Name (Publisher)

Indian Statistical Institute

Document Type

Master's Dissertation

Degree Name

Master of Technology

Subject Name

Computer Science


Advance Computing and Microelectronics Unit (ACMU-Kolkata)


Ghosh, Sasthi Charan (ACMU-Kolkata; ISI)

Abstract (Summary of the Work)

With the advent of new generation wireless networks and data networks with different coverage and bandwidth, the users are being pushed towards universal wireless access and ubiquitous computing through seamless personal and terminal mobility. Also there is a need of a mechanism that will enable the users perform the handover, that means switch from one network to another, with minimum or no disruption to the ongoing session/call that the user may be engaged in. By different data networks, we mean the different networks like UMTS(802.3),WLAN(802.11) & WiMax(802.16). There are quite a few literatures regarding handovers in-between these networks, out of which we will mainly be concentrating in WLAN-UMTS handovers. Traditional criteria of handovers and some in the literatures suffer from the fact that sometimes the handover decision is postponed for too long resulting in call drop or sometimes its taken too early resulting in some unnecessary handoffs. Here we try to take the decision a bit early such that when the user reach the cut-off point, its ready with the best candidate network to go to. Also, before taking the decision for any handover, we try to eliminate some handover cases by denoting them as unnecessary or superfluous, so that we need not unnecessarily do the rest of the process for cases where it can be avoided. In the other part of this work, apart from being able to take decide about the handover candidate network at appropriate time, we also try to maximize the call admission rate in that candidate network. So, not only we try to minimize the overhead of calculating or taking decisions for unnecessary handover cases, but we switch to the network providing us with the best possible call admission possibility. All these will be discussed in the following sections.


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Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.


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