Call Admission Control for Mobile Multimedia Wireless Networks

Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and handoff call blocking probabilities has previously been studied for a single service class only. This paper presents reservation policies for a multimedia system with two classes of service having different bandwidth requirements. The results show that a product-form solution can also be used for a fractional guard channel handoff policy using the same assumptions as used for a single class. This analytical solution is validated by means of simulations. Numerical optimization of the policies is also performed.