Wireless communication method, base station, wireless communication system, and communication apparatus

摘要

Provided are a wireless communication method, a base station, a wireless communication system and a communication apparatus whereby an interference power is calculated from an estimated propagation channel estimation result and the transmission power is controlled based on the interference power or the interference is suppressed by controlling the directivity, thereby increasing the transmission capacity. A propagation channel estimation circuit performs propagation channel estimation from a response signal transmitted from a terminal station and estimates a propagation channel estimation result. An interference power calculation circuit measures each interference power from a signal of each sub-carrier received by each of wireless units, and calculates an interference power for each sub-carrier from the propagation channel estimation result estimated by the propagation channel estimation circuit. When the calculated interference power is equal to or more than a predetermined threshold, an interference suppression signal generation circuit changes the transmission power and generates an interference suppression signal.

主权项

1. A wireless communication method in which each communication cell includes a base station and a terminal station, and a base station of a first communication cell performs wireless communication using the same time and frequency channel as a base station or a terminal station of a second communication cell adjacent to the first communication cell, the method comprising:
transmitting, from the base station of the second communication cell, a transmission request signal to request transmission from the base station of the second communication cell; waiting, by the base station of the first communication cell, for a response signal transmitted from the terminal station of the second communication cell to be received when receiving the transmission request signal; transmitting, by the terminal station of the second communication cell, a response signal when receiving the transmission request signal; receiving, by the base station of the first communication cell, the response signal transmitted from the terminal station of the second communication cell, and calculating an interference power between the base station of the first communication cell and the terminal station of the second communication cell from the response signal; and performing, by the base station of the first communication cell, data transmission to the terminal station of the first communication cell based on a transmission power determined from the interference power, further comprising: when the base station of the first communication cell performs data transmission to the terminal station of the first communication cell using the transmission power determined from the interference power, estimating, by the base station of the first communication cell, a propagation channel between the base station of the first communication cell and the terminal station of the first communication cell to acquire a propagation channel estimation result before a transmission request signal is transmitted from the base station of the second communication cell; calculating, by the base station of the first communication cell, a transmission rate in the first communication cell based on the propagation channel estimation result in the first communication cell, the propagation channel estimation result in the second communication cell, and the transmission power determined from the interference power; and determining, by the base station of the first communication cell, that the transmission is performed when the calculated transmission rate is equal to or more than a predetermined threshold.