Study of Location Management for Next Generation Personal Communication Networks

Abstract:The main target of location management is to maintain location of users while minimizing the system operation. The process consists of location update, paging, and database consideration. The location update and paging manages the user-network interaction cost as low as possible, while the database maintains user data and manages these data transferred efficiently. This research studies the scheme combining Velocity Paging (VP) and Timer-based update strategy with Distributed Database (DDB), comparing to the standard strategy, Location Area scheme (LA) with Centralized Database (CDB). The VP scheme estimates the paging area by the user’s velocity and the time span from the last registration. In Timer-based update scheme, Mobile Terminal (MT) updates its location when the timer exceeds the Time Threshold. The performance evaluation of location update, paging, and database is achieved. In LA scheme, a good selection of location area assignment can minimize the total cost. However, when the user’s behaviors change, the previous assignment cannot be optimum any more. For VP with Timer-based update scheme, a good selection of Time Threshold can minimize the total cost. Additionally, the Time Threshold can be adapted, according to user’s behaviors, to minimize the cost. Meanwhile, the Distributed Database (DDB) can manage the data transferred more efficiently than the Centralized Database (CDB)