A Track-Presetting strategy in PCS using hierarchical location databases

This paper proposes a new strategy of location management, the Track-Presetting strategy, for hierarchical location database architecture in Personal Communication Services. For a hot subscriber, it is possible to continually receive large numbers of calls in his/her movements. The Track-Presetting strategy is to preset a hot callee's address in the caller's current Registration-Area (RA), when the callee moves into a new RA; it needs one more database updating cost than the Cache strategy in the registration phrase, but it can significantly reduce the location tracking cost in the future. We shall also compare the performance of our strategy with those of the Cache strategy and the Basic strategy by analyzing the database access costs and signaling costs in detail. The Track-Presetting strategy is shown to have substantial benefits, especially as the subscriber's Call-to-Mobility Ratio increases under the assumption that there are short-cuts between the RAs in the real network topography.