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Mobile communication has been experiencing a rapid growth in recent years. The integration of PCSs becomes the best important research. In multi-tier PCS environment, the network resource are more precious. In this thesis, we use the hierarchically distributed structure to reduce network message and database lookup in Multi-Tier PCS environment. Simulation results show the effectiveness of the proposed strategy. Although our strategy needs to modify the mobility management protocol and needs more database capacity, this architecture can provide the other choice for administrator to reduce the location update and call tracking cost significantly.
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