Patent ID: 6496492
Filing Date: 2002-12-17
Classification: H04W

Abstract:
A hand-off control system for performing a hand-off process of a mobile station that is carrying out communication operations by way of a base station within a cell when said mobile station moves between a plurality of cells, said system comprising:measuring means for periodically measuring intensity of signals received from said base station at said mobile station; calculating means for calculating the amount of relative change in received signal intensity measured by said measuring means for each measurement interval; queue storing means for storing queues that are given priority based on the amount of relative change in received signal intensity calculated by said calculating means; request processing means for, When hand-off is requested, allocating a call of the mobile station that has requested hand-off to the appropriate queue based on the amount of relative change in received signal intensity in the mobile station; waiting rank determining means for determining the waiting rank of a call of said mobile station within the queue in which the call of said mobile station has been allocated based on said intensity of received signals measured by said measuring means for every interval of measurement of the intensity of received signals; queue reallocating means for, when said amounts of relative change are updated, periodically reallocating calls stored in each of said queues for every measurement interval of said received signal intensity such that said calls are stored in queues according to the amount of relative change in received signal intensity; and queue control means for monitoring whether or not there are free channels within the destination cell of said mobile station, and when there are free channels in said cell, assigning calls allocated to that queue to said free channels in an order that is based on the priority of said queues and the waiting ranks within the queues.