Prioritized Channel Assignment to Multimedia Calls in Wireless Cellular Networks

Two important Quality of Service (QOS) parameters in cellular networks are call blocking probability (CBP) and handoff dropping probability (HDP). CBP represents the probability that a new call is blocked due to unavailability of channels. HDP represents the probability that a handoff call is dropped if no channel is available in the new cell. How to keep the probability of handoff drops within a prespecified limit is a very important measure of Quality of Service (QOS) issue in cellular networks because mobile users should be able to maintain ongoing sessions during their handoff from one cell to another. It is generally presumed that a handoff call always has an acceptable signal quality, however, there may be a small probability that such calls do not have adequate signal quality and they cannot be sustained by the new base station due to poor signal quality. We have taken a note of this in case of handoff calls. Two models are proposed to calculate the blocking probability of new calls and the dropping probability of handoff calls, using fixed channel assignment (FCA) scheme in a cellular system.