Patent ID: 8787916

Claim:
A method for performing a handover in a wireless communications system, the method comprising: detecting handover information between a network and a mobile terminal, the handover information comprising a propagation delay time; determining a portability of the mobile terminal based on the handover information and by determining location information of the mobile terminal through use of the propagation delay time, obtaining distance information by using a difference between a first location information and a second location information of the mobile terminal, and estimating speed information of the mobile terminal by using the distance information and a point of time of a measurement of the propagation delay time; estimating a serviceable time for the mobile terminal, associated with a current service area of the network, based on the speed information and the current service area; determining whether to perform the handover for the mobile terminal when a service disconnection is estimated based on the portability of the mobile terminal and by comparing the serviceable time with a preset critical value; maintaining a service connection between the network and the mobile terminal when the serviceable time is greater than the preset critical value; and determining to execute the handover when the serviceable time is less than or equal to the preset critical value.