Teletraffic characteristics in prioritized handoff control method considering reattempt calls

When a mobile station with a call in progress moves across cell boundary in a cellular mobile communications system, the system must switch the circui t to the base station in the destination cell to enable uninterrupted commu nications in a process sailed "handoff." However, if a circuit to the desti nation base station cannot he secured when a handoff is attempted. the call is forcibly terminated. Studies have therefore been performed on methods o f decreasing the percentage of forcibly terminated calls by giving handoff calls priority. With the aim of simplifying system design, we propose a sys tem for automatically setting the number of circuits reserved for handoff b ased on the handoff block rate. In this paper, we describe this system and Evaluate static traffic characteristics taking into account reattempt calls , the occurrence of which can have a major effect on system performance. We also consider the effects of the proposed system on service quality since giving priority to handoff calls and decreasing the rate of forced terminat ions results in a tradeoff with the blocking rate of new call attempts. Fin ally, we evaluate the traffic characteristics associated with the number of control requests, an important element in estimating the processing capaci ty required by control equipment at the time of system design.