Patent ID: 8588841

Claim:
A base station apparatus that estimates whether or not each terminal device belonging to a communication cell of the present apparatus is present in an end area of the cell, wherein the apparatus comprises: a reception device that receives from each terminal device, transmission power information which indicates transmission power of the terminal device; a registration device that successively registers the transmission power information with a storage device; a statistical processing device that computes a statistic used for estimating the terminal device present in the end area of the communication cell, with respect to a population which is the transmission power information stored in the storage device; a candidate extraction device that extracts candidates for the terminal device present in the end area of the communication cell, based on the statistic computed by the statistical processing device; and an estimation device that estimates the terminal device present in the end area of the communication cell from among the candidates extracted by the candidate extraction device; wherein the transmission power information is a “Power Headroom Report”, abbreviated as PHR, which indicates a difference between currently transmitted power and the maximum transmission power of the terminal device.