Patent ID: 7860502
Filing Date: 2010-12-28
Classification: H04B,H04W

Abstract:
1. A hard handover method performed by a mobile terminal in a wireless communication system including a serving base station (BS) currently serving the mobile terminal and at least one neighboring BS, the mobile terminal located within both a border of a cell served by the serving BS and a border of a cell served by the at least one neighboring BS, the method comprising: checking, by the mobile terminal, a signal-to-noise ratio (SNR) of an interference signal received from the at least one neighboring BS while in communication with the serving BS, and canceling, by the mobile terminal, from a signal received from the serving BS, interference caused by the interference signal received from the at least one neighboring BS, to generate an interference-canceled signal if, upon using an operation, it is determined that the SNR of the interference signal received from the at least one neighboring BS satisfies a select condition; sending, by the mobile terminal, a handover request to the serving BS, if a difference between an SNR of the interference-canceled signal and the SNR of the interference signal received from the at least one neighboring BS reaches a handover request threshold; and upon receipt of a handover approval from the serving BS, releasing, by the mobile terminal, a communication channel to the serving BS, and connecting, by the mobile terminal, a call to the at least one neighboring BS that provides the interference signal whose SNR has satisfied the select condition; wherein the operation used for determining whether the SNR of the interference signal received from the at least one neighboring BS satisfies the select condition comprises: registering, in an interferer candidate group (ICG), any neighboring BS if a difference between an SNR of the signal received from the serving BS and an SNR of a signal received from the neighboring BS is within a select threshold; registering, in an interferer group (IG), any BS that transmits a signal having a higher strength than a threshold for interference cancellation among signals received from BS(s) registered in the ICG; and canceling interference caused by a signal received from each of BS(s) registered in the IG.