1、I consider location-aided handoff decision in hierarchical cellular networks supporting soft handoff for UMTS/WCDMA，where users with different mobility are assigned to different layers，I.e.，microcells in the lower layer

2、are used to serve slow mobility users，whereas macrocells in the upper layer are used to serve fast mobility users. Furthermore handoff priorities are provided for handoff calls in both layers，so that forced termination p

3、robability can be reduced.
　　 Location-aided handoff decision is proposed and studied in homogeneous hierarchical cellular environment and derive mathematical analysis for the considered system with one-dimensional b

4、irth–death process and utilize Erlang B method to find the steady-state probability distribution and thus measure and analyze new call blocking，handoff failure，forced termination probability and channel efficiency of the

5、 proposed algorithm. Analytical result show that proposed location aided handoff decision scheme could achieve better performance improvement than conventional one. Lastly，the studied location aided handoff decision sche