System, method, and apparatus of beam-tracking and beam feedback operation in a beam-forming based system

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive, from a base station via the transceiver, a radio resource control (RRC) message including information on a dedicated random access preamble for a beam failure recovery and information on a threshold for the beam failure recovery,
• measure a first measurement value of a serving beam and a second measurement value of at least one beam,
• in case that the first measurement value below a first threshold, trigger a random access procedure for the beam failure recovery based on the second measurement value above a second threshold,
• select one beam for the beam failure recovery, in case that the beam failure recovery is triggered,
• transmit, to the base station via the transceiver, the dedicated random access preamble associated with the one selected beam for the beam failure recovery based on contention-free random access,
• receive, from the base station via the transceiver, a random access response as a response to the random access preamble, and
• transmit, to the base station via the transceiver, a message as a response to the random access response, the message including first information indicating that the message is associated with beam feedback and a plurality of second information for identities of the at least one beam,
• wherein the RRC message further includes information on random access resources corresponding to each of at least two beams, and
• wherein a beam to be changed for the terminal and the base station is identified based on a random access resource used for the dedicated random access preamble.

A method performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, a radio resource control (RRC) message including information on a dedicated random access preamble for a beam failure recovery and information on a threshold for the beam failure recovery;
• receiving, from the terminal, the dedicated random access preamble associated with one selected beam among at least one beam measured for a second measurement value, in case that the beam failure recovery is triggered based on a first measurement value of a serving beam below a first threshold and the second measurement above a second threshold, the dedicated random access preamble being received based on contention free random access;
• transmitting, to the terminal, a random access response as a response to the random access preamble;
• and
• receiving, from the terminal, a message as a response to the random access response, the message including first information indicating that the message is associated with beam feedback and a plurality of second information for identities of the at least one beam,
• wherein the RRC message further includes information on random access resources corresponding to each of at least two beams, and
• wherein a beam to be changed for the terminal and the base station is identified based on a random access resource used for the dedicated random access preamble.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• transmit, to a terminal via the transceiver, a radio resource control (RRC) message including information on a dedicated random access preamble for a beam failure recovery and information on a threshold for the beam failure recovery,
• receive, from the terminal via the transceiver, the dedicated random access preamble associated with one selected beam among at least one beam measured for a second measurement value, in case that the beam failure recovery is triggered based on a first measurement value of a serving beam below a first threshold and the second measurement above a second threshold, the dedicated random access preamble being received based on contention free random access,
• transmit, to the terminal via the transceiver, a random access response as a response to the random access preamble, and
• receive, from the terminal via the transceiver, a message as a response to the random access response, the message including first information indicating that the message is associated with beam feedback and a plurality of second information for identities of the at least one beam,
• wherein the RRC message further includes information on random access resources corresponding to each of at least two beams, and
• wherein a beam to be changed for the terminal and the base station is identified based on a random access resource used for the dedicated random access preamble.