Method and device for selecting antenna or beam in wireless communication system using beamforming technique

A method by a base station for indicating a terminal beam selection in a wireless communication system using a beamforming technique, comprising:

• generating a beam refinement reference signal identifier for a terminal and configuration information of a beam refinement reference signal process and transmitting generated the beam refinement reference signal identifier and configuration information of a beam refinement reference signal process to the terminal via higher layer signaling;
• generating and transmitting, to the terminal, downlink control information including allocation information of a beam refinement reference signal and beam refinement indication information;
• transmitting a beam refinement reference signal based on the downlink control information and the higher layer signaling;
• receiving beam refinement information reported from the terminal;
• and
• transmitting data to the terminal based on the received beam refinement information,
• wherein the beam refinement reference signal is an aperiodic channel state information reference signal.

A base station device for indicating a terminal beam selection in a wireless communication system using a beamforming technique, comprising:

• a radio processor configured to transmit and receive signals with at least one terminal;
• a memory storing base station beam information and base station beam mapping information to be transmitted to a terminal, terminal beam information, allocation information of a beam refinement reference signal, a beam refinement reference signal identifier, and a beam refinement reference signal process;
• and
• a base station processor configured to control to generate and transmit, to a specific terminal through the radio processor by higher layer signaling, the beam refinement reference signal identifier for the terminal and configuration information of the beam refinement reference signal process, generate and transmit, to the terminal through the radio processor, downlink control information including the allocation information of a beam refinement reference signal and beam refinement indication information, transmit the beam refinement reference signal based on the downlink control information and the higher layer signaling through the radio processor, receive beam refinement information reported from the terminal, and transmit data to the terminal based on the received beam refinement information,
• wherein the beam refinement reference signal is an aperiodic channel state information reference signal.

A method by a terminal for beam selection in a wireless communication system using a beamforming technique, comprising:

• receiving a beam refinement reference signal identifier and configuration information of a beam refinement reference signal process through higher layer signaling;
• receiving allocation information of a beam refinement reference signal and beam refinement indication information through downlink control information;
• receiving a beam refinement reference signal for each of terminal beams based on the downlink control information and the higher layer signaling by sweeping the plurality of terminal beams;
• measuring a received signal strength of the received beam refinement reference signal corresponding to each of the terminal beams;
• selecting the terminal beam having a highest received signal strength based on the received signal strength measurement;
• and
• feeding terminal beam selection information and a reference signal identifier of the selected terminal beam back to a base station,
• wherein the beam refinement reference signal is an aperiodic channel state information reference signal.

A terminal device for beam selection in a wireless communication system using a beamforming technique, comprising:

• a radio processor configured to transmit and receive signals with a base station;
• a memory storing information received from the base station and storing terminal beam information and beam reselection information;
• and
• a terminal processor configured to control the radio processor to receive higher layer signaling including a beam refinement reference signal identifier and configuration information of a beam refinement reference signal process, control the radio processor to receive downlink control information including allocation information of a beam refinement reference signal and beam refinement indication information, control the radio processor to receive a beam refinement reference signal for each of terminal beams based on the downlink control information and the higher layer signaling by sweeping the plurality of terminal beams, measure a received signal strength of the received beam refinement reference signal corresponding to each of the terminal beams, select the terminal beam having a highest received signal strength based on the received signal strength measurement, and control the radio processor to feed terminal beam selection information and a reference signal identifier of the selected terminal beam back to a base station,
• wherein the beam refinement reference signal is an aperiodic channel state information reference signal.

A method by a terminal for beam selection and antenna selection in a wireless communication system using a beamforming technique, comprising:

• receiving a beam refinement reference signal identifier and configuration information of a beam refinement reference signal process through higher layer signaling;
• receiving allocation information of a beam refinement reference signal and beam refinement indication information through downlink control information;
• checking whether an antenna selection mode is configured in the downlink control information;
• configuring a received beam of the terminal based on the antenna selection mode being configured;
• receiving the beam refinement reference signal based on the downlink control information and the higher layer signaling while sweeping a plurality of terminal beams;
• measuring a received signal strength of the beam refinement reference signal for each of the terminal beams;
• calculating a coupling channel gain with respect to a combination of the measured received signal strength and the beam refinement reference signal;
• selecting an antenna having a best channel gain;
• and
• feeding selected antenna information back to a base station.

A terminal device for beam selection or antenna selection in a wireless communication system using a beamforming technique, comprising:

• a radio processor configured to transmit and receive signals with a base station;
• a memory storing information received from the base station and storing terminal beam information and beam reselection information;
• and
• a terminal processor configured to control the radio processor to receive a beam refinement reference signal identifier and configuration information of a beam refinement reference signal process through higher layer signaling, control the radio processor to receive allocation information of a beam refinement reference signal and beam refinement indication information through downlink control information, check whether an antenna selection mode is configured in the downlink control information;
• control the radio processor to configure a received beam of the terminal based on the antenna selection mode being configured, control the radio processor to receive the beam refinement reference signal based on the downlink control information and the higher layer signaling while sweeping a plurality of terminal beams, measure a received signal strength of the beam refinement reference signal for each of the terminal beams, calculate a coupling channel gain with respect to a combination of the measured received signal strength and the beam refinement reference signal, select an antenna having a best channel gain, generate a message for feeding selected antenna information back to a base station and control the radio processor to transmit the message.