Survivability Index for GSM Network

The cellular mobile technology has been emerged astonishingly over the last decade. Global system for mobile (GSM) is most dominant among various cellular standard. It was developed in Europe and deployed in many parts of world. Now a day it carries critical business and social information of many subscribers thus proper quantification of quality of service must be done. In this work, survivability index (SI) has been proposed for above purpose. Survivability is one of many words which were coined as a measure of degree to which a system is able to provide critical services. Traditionally, survivability of cellular systems is measured in terms of one of following parameters: the number of functioning units, the maximum traffic capacity, blocking probability and the service restoration time, etc [1][2]. The available measures of survivability do not cover many inherent features simultaneously. This work is a step towards development of a compact and effective measure of cellular network survivability. SI has a weighted sum form which takes into account following features of a cellular network (i) blocking probability, (ii) dropping probability, (iii) voice quality, in terms of carrier to cochannel interference ratio (C/P) and (iv) availability. Its analysis has also been done for GSM network by considering two different failure scenarios. The evaluation of a GSM network has also been for different failure scenarios.