Prioritized Handover Requests in Cellular Mobile System with Subrating for Integrated Voice/Data Traffic

Abstract

Priority to hand off attempts in cellular radio network dealing with integrated traffic has proven to be one of the important issue to improve the grade of service (GOS) of such system. We propose prioritized fixed channel assignment strategy with subrating to protect the interest of handoffs in cellular radio network. To reduce the drop calls, finite buffering for handoffs of voice calls are allowed. The integrated voice/data traffic is originated from infinite population. Analytical results for the blocking probability of new and handoff attempts for each traffic group are derived by using steady state queue size distribution of the number of attempts in the system. We also derive expressions for blocking probabilities, delay probabilities and carried load etc. Since data/voice traffic users are usually, finite in numbers, finite population model has also been discussed. An iterative algorithmic procedure has been presented and validated by assigning the parameters of the system in order to compute performance measures. The optimal allocation of channels among new and handoff calls has been ascertained by formulating discrete capacity allocation problem. Numerical experiment has been performed to obtain optimum number of guard channels.