Patent ID: 9531069
Filing Date: 2016-12-27
CPC Classification: H01Q,H04B,H04J,H04L,H04W

Claim Text:
1. A base station in a communication system provided with a plurality of base stations, comprising: a communication unit for communicating with a communication terminal by use of a plurality of antennas; and a generation unit for generating a signal transmitted from the communication unit, wherein a first reference signal and a second reference signal are to be transmitted by the communication terminal in the communication system, wherein a plurality of carriers for use in transmission of the first reference signal are alternately arranged with a plurality of carriers for use in transmission of the second reference signal in the same transmission frequency band, wherein at the time of transmitting a signal to a communication terminal that transmits the first reference signal, the communication unit performs null-steering in relation to transmission directivity at the plurality of antennas based on the first reference signal from the communication terminal, wherein the base station further comprises a decision unit for deciding which one between the first reference signal or the second reference signal is to be transmitted by the communication terminal based on a signal from the communication terminal which is received in the communication unit, and wherein the communication unit