Patent ID: 8374099
Filing Date: 2013-02-12
Classification: H04W

Abstract:
1. A communication system configured of a gateway device, at least one base station or more, and at least one mobile station or more, wherein: said base station comprises: a measurement unit for receiving predetermined information associate with said mobile station from said gateway device, changing a radio resource amount being employed for transmitting said predetermined information, transmitting said predetermined information to the mobile station, and measuring statistics associate with completion of a communication process including at least a response to said predetermined information; and a reception error ratio calculator for calculating a reception error ratio of said predetermined information based upon said statistics; and said mobile station comprises an information response unit for, when receiving said predetermined information, transmitting a response signal to said base station, wherein said predetermined information is paging information, wherein: said measurement unit comprises: a paging information transmission power control unit for transmitting the paging information at a predetermined probability by employing a current transmission power, a transmission power smaller than said current transmission power, and a transmission power larger than said current transmission power; and a response number-of-times measurement unit for measuring a number of times of the responses to the paging information at each transmission power; and said reception error ratio calculation unit comprises a paging information reception error ratio calculation unit for, based upon said number of times of the responses to the paging information at each transmission power, calculating one of a reception error ratio of the paging information at the time of the current transmission power, and a reception error ratio of the paging information at the time of the transmission power smaller than said current transmission power, or both, wherein: said response number-of-times measurement unit measures a number of times Npage of the transmission of the paging information at the current transmission power, a number of times Nres of the reception of the responses to the above transmission of the paging information, a number of times Npage_high of the transmission of the paging information at the transmission power higher than the current transmission power, a number of times Nres_high of the reception of the responses to the above transmission of the paging information, a number of times Npage_low of the transmission of the paging information at the transmission power lower than the current transmission power, and a number of times Nres_low of the reception of the responses to the above transmission of the paging information: and said paging information reception error ratio calculator: calculates a response probability Pres_current that the response to the paging information at the current transmission power is made from Pres_current=Nres/Npage; calculates a response probability Pres_low that the response to the paging information at the transmission power lower than the current transmission power is made from Pres_low=Nres_low/Npage_low; calculates a response probability Pres_high that the response to the paging information at the transmission power higher than the current transmission power is made from Pres_high=Nres_high/Npage_high; calculates a reception error ratio Perr of the paging information at the time of the current transmission power from Perr=1−Pres_current/Pres_high; and calculates a reception error ratio Perr_low of the paging information at the transmission power lower than the current transmission power from Perr_low=1−Pres_low/Pres_high.