Two location tracking strategies for PCS systems

This paper presents two location tracking strategies (LS-I and LS-II) for personal communications services (PCS) systems. In the proposed schemes, the movement history of a mobile terminal (MT) since the last location update is taken into account in making a location update decision. In particular, before reaching the update threshold the movement counter is increased only after the MT visits a new cell. When the MT revisits a cell since the last location update, in the LS-I scheme the counter remains unchanged, while in the LS-II scheme the counter is assigned with the old counter value when the MT visited this cell last time. Analytic and simulation results demonstrate that when the call-to-mobility ratio (CMR) is low, the proposed schemes can achieve a significant cost reduction compared to the movement-based scheme.