Priority based adaptive guard channel for multi-class traffic in wireless networks

An increasing demand of multi-class traffic has become a prime concern in wireless communication system. Quality of service is seen to be degrading to fulfill these demands. To handle multi-class traffic, already different schemes exist such as non-priority scheme, fixed guard channel reservation scheme, queuing scheme, etc. These schemes do not meet the requirements of minimizing the new call blocking probability and increasing the channel utilization at the same time. Here, we are proposing a new adaptive guard channel scheme for multi-class traffic system to minimize both the new call blocking probability of higher priority calls and keeping the channel utilization in a suitable range so that, both the performance metrics are optimized and thus provides good quality of service. In our adaptive guard channel scheme, guard channels are reserved adaptively on the basis of the arrival rates of the traffic classes and the number of channels occupied. In this paper at first we discuss different schemes for multi-class traffic system, and then discuss different problems in these schemes. Then, we introduce our proposed scheme, mathematical modeling and queuing analysis of it and at last we show the improvement in our scheme through performance analysis.