Patent ID: 9179369
Filing Date: 2015-11-03
Classification: H04W,Y02D

Abstract:
1. A method of performing a handover by a femto base station in a wireless communication system, the method comprising: monitoring an uplink signal transmitted from a user equipment (UE) to a macro base station, wherein the uplink signal is monitored at resources indicated by resource information related to the uplink signal when the femto base station has received the resource information from the macro base station, otherwise another uplink signal is monitored at a dedicated periodic ranging slot of the macro base station; obtaining an uplink transmission power value used by the UE to transmit the uplink signal; estimating a distance between the UE and the femto base station based on the uplink transmission power value and a value regarding the monitored uplink signal's strength; and transmitting a handover initiation message to the macro base station if the estimated distance satisfies a condition to indicate a proximity of the UE to the femto base station.