Patent ID: 7839827
Filing Date: 2010-11-23
Classification: H04W

Abstract:
1. A mobile communication system, comprising: a mobile station (MS); a serving base station (BS) for measuring a strength of a first uplink signal received from the MS, transmitting a request for transmission of a signal through a frequency band unused in an uplink to the MS, and measuring a strength of a second uplink signal received in response to the request, receiving information about a strength of a third uplink signal measured by at least one neighbor BS, and determining a handoff for the MS considering the strength of the first uplink signal, the strength of the second uplink signal and the strength of the third uplink signal; and the at least one neighbor BS for measuring the strength of the third uplink signal received from the MS at a request of the serving BS, and transmitting information about the measured strength of the third uplink signal to the serving BS.