Radio relay apparatus, radio communication method and processer for controlling radio relay apparatus

A radio communication method, in a radio communication system employing Time Division Duplex (TDD) scheme, used by a radio relay apparatus for relaying data transmitted and received between a radio base station and a radio terminal, wherein the radio relay apparatus includes

• a base-station-side communication transceiver configured to transmit radio waves to and receive radio waves from the radio base station;
• and
• a terminal-side communication transceiver configured to transmit radio waves to and receive radio waves from the radio terminal at transmission and reception timings inverting transmission and reception timings of the radio base station,
• the radio communication method comprising steps of:
• upon detection of a predetermined event,
• extracting, from received signals from a plurality of base stations, reception power of the base-station-side communication transceiver for a received signal from a radio base station using a frequency the terminal-side communication transceiver uses;
• and
• setting, based on the extracted reception power, transmission power of the terminal-side communication transceiver, wherein
• detection of the predetermined event is detection of restoration from an idle state or detection of handover between the radio relay apparatus and the radio base station, and
• when the reception power is large, the transmission power is set to be small, and when the reception power is small, the transmission power is set to be large.

A processor, in a radio communication system employing Time Division Duplex (TDD) scheme, for controlling a radio relay apparatus which relays radio waves transmitted and received between a radio base station and a radio terminal, comprising:

• a base-station-side communication transceiver configured to transmit radio waves to and receive radio waves from the radio base station;
• a terminal-side communication transceiver configured to transmit radio waves to and receive radio waves from the radio terminal at transmission and reception timings inverting transmission and reception timings of the radio base station;
• a base-station-side controller including a second processor configured to extract, from signals from a plurality of radio base stations received by the base-station-side communication transceiver, reception power of the base-station-side communication transceiver for a received signal from a radio base station using a frequency the terminal-side communication transceiver uses;
• and
• a terminal-side controller including a third processor configured to set transmission power of the terminal-side communication transceiver, wherein
• the terminal-side controller, when the terminal-side controller or the base-station-side controller detects a predetermined event, obtains the reception power from the base-station-side controller and, based on the reception power, sets the transmission power of the terminal-side communication transceiver, and wherein
• detection of the predetermined event is detection of restoration from an idle state or detection of handover between the radio relay apparatus and the radio base station, and
• when the reception power is large, the terminal side controller sets the transmission power to be small, and when the reception power is small, the terminal side controller sets the transmission power to be large.