Patent ID: 8189711
Filing Date: 2012-05-29
Classification: H04L,H04W

Abstract:
1. A transmission controlling method for use in a wireless communications system including: a transmitter which codes a transmission signal with use of an error correction code exhibiting a tendency of a communications capacity being close to its theoretical value; and a receiver which receives the transmission signal from the transmitter, said transmission controlling method comprising: on the transmitter, defining a certain relationship for a unit of code between an evaluation amount relating to a reception condition of the transmission signal and an error rate of a code block obtained from reception power quality on the receiver, which relationship is independent from propagation circumstances between the transmitter and the receiver; and controlling a transmission power of the transmission signal to be transmitted from the transmitter, using a transmission control information generator, based on the defined relationship, wherein the evaluation amount C(P) is expressed by the following formula (A) and the error rate is related to the evaluation amount C(P): where P is transmission power; A is a channel value of a propagation path in the propagation circumstances; N is interference and noise power in the propagation circumstances; a is a constant; M is a number of symbols in a unit of coding or the number of blocks each formed by a plurality of symbols, and wherein the error rate is expressed by the following formula (B): where each of the a 0 , a 1 , and a 2 is a constant.