Modeling And Cost Analysis Of Distance-Based Location Management For Pcs Networks

Location management is of great importance in personal communication services (PCS) networks, which mainly aims at effectively keeping track of mobile terminals (MTs) for call delivery. Performance analysis plays a central role in the performing of location management methods and system design in PCS networks. The signaling cost analysis is one of the essential indicators. Currently, three dynamic location management schemes which are based on time, movement and distance location management schemes are proposed to analyze the performance of wireless communication networks. It is well-known that the total signaling cost of a distance-based location management schemes is the lowest among dynamic location management schemes. However, the traditional analytical methods are not able to compute location update cost precisely due to the issue’s complexity and difficulty.Firstly, this thesis adopts cell level Markov chain as mobility model to describe the movement of MT in two-dimensional cellular structures. Location update Times and location management cost based on distance location management scheme are analyzed when inter-call time and cell residence time have general distributions by establishing the location update model between two consecutive arrival calls.Secondly, location update model which is established by analyzing distance-based location management scheme is applied to movement-based and static location management schemes and the performance of three schemes are compared. Simultaneously, the impact of movement-based location management is observed under different parameters. The differences in static and movement-based location management schemes between analysis model in this thesis and the present are compared.Finally, considering HLR/VLR(Home Location Register/Visitor Location Register) structure in current PCS networks, describing movement model of MT in different location areas by adopting embedded Markov chain as mobility model are established and location management cost based on distance location update method and sequential paging strategy are analyzed when inter-call time has exponential distribution and cell residence time has general distribution. Moreover, the performance is estimated under different parameters.Our analysis makes it possible to find the optimal distance threshold that minimizes the total cost of location management in a distance-based location management scheme. Moreover, the analysis model has a wide applicability which deals with coincidences of cell boundaries and location area boundaries exactly.