Cost-minimization for a Personal Communication Services Network Using Random -walk Mobility Management Model

摘要

This paper addresses the mobility management issues to achieve a cost effective network architecture for a'PCSN. The mobility tracking mechanism, proposed in this paper, combines a Random-Walk movement based location update policy with a paging scheme. It is not needed that each time a mobile terminal changes its location co-ordinates, HLR should be updated. If capacity constraints of MSCs are not violated, necessary updates in VLRs (which are co-located with the MSCs) would suffice. Hence MSCs can be connected in a super-net topology where highest level MSCs are only connected to the existing wireline network. To handle an initiated call in a PCSN environment, network infrastructure performs several operations through MSCs among which most significant ones are location update and paging. Signaling loads generated in a PCSN for location update and paging depend upon the fact that, how frequently HLR and VRLs are accessed. To reduce the total design cost, the frequency of these operations requested by an actively and randomly roaming mobile terminal must be reduced. This can be achieved by limiting the number of database update in HLR. In our previous works we proposed a hierarchical connection among the MSCs, where each MSC can have a density greater than or equal to one. Compared to IS-41, we showed that the design cost would be lesser for our multi-layer architecture. To establish the design, we assumed a simplified mobility management model. In the present work we conform to the same network topology but attempt to refine the analytical model for mobility management using modeling techniques for Random-Walk stochastic processes.