Traffic management in GSM networks

In this research work two non-borrowing frequency channel assignment (FCA) schemes, non-prioritized scheme (NPS) and reserved channel scheme (RCS), are compared. In NPS all the channels in a cell are available for both initial and handoff calls while in RCS some channels are reserved for handoff calls and the remaining channels can be utilized for both initial and handoff calls. The formulae for computing blocking probabilities for initial and handoff calls are derived using steady state balance equations defined by Markov chain model. Simulation results show that the blocking probability is a decreasing function of number of channels. When the additive white Gaussian noise (AWGN) is added then the probability of blocking is increased. We considered four values of AWGN that are -50 dB, -40 dB, -20 dB, 0 dB. For -50 dB, -40 dB, -20 dB noise has a little effect on the probability of blocking, but at 0 dB noise probability of blocking is increased.