PERFORMANCE ANALYSIS OF IMPLICIT DE-REGISTRATION STRATEGIES FOR SINGLE AND MULTI-HLR ARCHITECTURE

Location Management is a key issue in PCS networks. De-registration is one of major steps in location management which contributes significantly in mobile location update cost. Attempts have been made by researchers to reduce the location management cost by introducing the concept of implicit de-registrations and by modifying the single-HLR (HLR-VLR centralized) architecture to multi-HLR. This paper attempts to modify the Multi-HLR architecture’s explicit de-registration strategy by using two types of implicit de-registration strategies, namely-polling and time-out and shows the impact of this modification on location update cost of mobile users. To evaluate the overall reduction in location update cost due to this modification, it considers signle-HLR architecture with same implicit de-registration strategies as a reference and makes a comparative analysis.