Patent ID: 8351864
Filing Date: 2013-01-08
Classification: H04L

Abstract:
1. A radio terminal apparatus comprising a receiving section that receives a received signal; a demodulating section that demodulates the received signal; a calculating section that calculates an RSSI (Received Signal Strength Indicator) and SNR (Signal to Noise Ratio) of a beacon signal included in the received signal, and a variation of the SNR over several past receptions; a deciding section that, when a demodulation error occurs and the variation of the SNR is below a threshold for variation, when the RSSI is above a threshold for RSSI and the variation of the SNR is below the threshold for variation, or when the SNR is below a threshold for SNR and the variation of the SNR is below the threshold for variation, decides that there are interference waves equal to or above the predetermined level, or otherwise, decides that there are interference waves below the predetermined level; a retransmission count upper limit value setting section that sets an upper limit value of a number of retransmissions lower when the deciding section decides that there are interference waves equal to or above the predetermined level than when the deciding section decides that there are interference waves below the predetermined level; and a transmitting section that repeats transmitting a transmission signal a same number of times as the upper limit value until the transmission signal is successfully transmitted.