Patent ID: 8755351

Claim:
A wireless line usage status monitoring method comprising: extracting a synchronizing signal of each of frames received from a plurality of base stations and a known signal of a fixed power and a known pattern transmitted together with transmission data within a time slot in which the transmission data are included but not transmitted within a time slot in which the transmission data are not included; measuring a reception power of the synchronizing signal and a reception power of the known signal for each base station; determining a usage status of a wireless line of each base station based on the reception power of the synchronizing signal and the reception power of the known signal; and selecting a base station with the wireless line usage rate being lowest as a handover destination base station; wherein the determining comprises calculating a wireless line usage rate as indicating the usage status from a ratio of the retention power of the synchronizing to the reception power of the known signal: wherein the selecting selects, as the handover destination base station, a base station with the wireless line usage rate being lowest and lower than a specified value or a base station with the wireless line usage rate being lowest and with a wireless line usage rate difference with respect to a base station during a call connection exceeding a specified threshold value.