System, method, and apparatus of beam-tracking and beam feedback operation in a beam-forming based system
The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). A mobility application method of a user equipment (UE) residing in a system of wireless communication systems, which supports transmission/reception of data, using a beamforming, via multiple input multiple output (MIMO) antennas is provided. The method includes measuring beam measurement reference signals that a network transmitted using different transmission nodes and evolved NodeB (eNBs) and transmitting the measured information to the network in a system using a number of beams.
1. A method of a terminal, the method comprising:
receiving, from a base station, a dedicated radio resource control (RRC) message including random access channel resources and a second threshold for a beam failure recovery, the random access channel resources including a random access preamble for the beam failure recovery associated with a plurality of beams of the base station;
obtaining a measurement value by measuring a serving beam of the base station and a reference signal received power (RSRP) by measuring at least one beam of the base station;
determining whether to trigger a random access procedure for the beam failure recovery of a selected beam among the plurality of beams based on the measurement value and the RSRP; and
transmitting, to the base station, the random access preamble for the beam failure recovery of the selected beam among the plurality of beams in case that the measurement value is less than a first threshold and the RSRP is greater than the second threshold.
2. The method of claim 1 , wherein the random access preamble is transmitted based on contention-free random access in case that the RSRP is greater than the second threshold and the random access channel resources are allocated based on the dedicated RRC message.
3. The method of claim 1 ,
wherein the random access channel resources further include 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 random access preamble.
4. The method of claim 1 , wherein the random access preamble is transmitted based on contention based random access in case that the RSRP is less than the second threshold.
5. The method of claim 1 , wherein the random access preamble is transmitted through a beam having the RSRP above the second threshold among the at least one beam of the base station, and
wherein the measurement value and the first threshold are associated with a block error rate (BLER).
6. A terminal comprising:
a transceiver; and
at least one processor configured to:
receive, from a base station via the transceiver, a dedicated radio resource control (RRC) message including random access channel resources and a second threshold for a beam failure recovery, the random access channel resources including a random access preamble for the beam failure recovery associated with a plurality of beams of the base station,
obtain a measurement value by measuring a serving beam of the base station and a reference signal received power (RSRP) by measuring at least one beam of the base station,
determine whether to trigger a random access procedure for the beam failure recovery of a selected beam among the plurality of beams based on the measurement value and the RSRP, and
transmit, to the base station via the transceiver, the random access preamble for the beam failure recovery of the selected beam among the plurality of beams in case that the measurement value is less than a first threshold and the RSRP is greater than the second threshold.
7. The terminal of claim 6 , wherein the random access preamble is transmitted based on contention-free random access in case that the RSRP is greater than the second threshold and the random access channel resources are allocated based on the dedicated RRC message.
8. The terminal of claim 6 ,
wherein the random access channel resources further include 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 random access preamble.
9. The terminal of claim 6 , wherein the random access preamble is transmitted based on contention based random access in case that the RSRP is less than the second threshold.
10. The terminal of claim 6 ,
wherein the random access preamble is transmitted through a beam having the RSRP above the second threshold among the at least one beam of the base station, and
wherein the measurement value and the first threshold are associated with a block error rate (BLER).
11. A method of a base station, the method comprising:
transmitting, to a terminal, a dedicated radio resource control (RRC) message including random access channel resources and a second threshold for a beam failure recovery, the random access channel resources including a random access preamble for a beam failure recovery associated with a plurality of beams of the base station; and
receiving, from the terminal, the random access preamble for the beam failure recovery of a selected beam among the plurality of beams, in case that a random access procedure for the beam failure recovery is triggered based on a measurement value being less than a first threshold and a reference signal received power (RSRP) being greater than the second threshold,
wherein the measurement value is obtained by measuring a serving beam of the base station and the RSRP is obtained by measuring at least one beam of the base station, and
wherein the random access procedure for the beam failure recovery of the selected beam among the plurality of beams is triggered based on the measurement value and the RSRP.
12. The method of claim 11 , wherein the random access preamble is transmitted based on contention-free random access in case that the RSRP is greater than the second threshold and the random access channel resources are allocated based on the dedicated RRC message.
13. The method of claim 11 ,
wherein the random access channel resources further include 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 random access preamble.
14. The method of claim 11 , wherein the random access preamble is transmitted based on contention based random access in case that the RSRP is less than the second threshold.
15. The method of claim 11 ,
wherein the random access preamble is transmitted through a beam having the RSRP above the second threshold among the at least one beam of the base station, and
wherein the measurement value and the first threshold are associated with a block error rate (BLER).
16. A base station comprising:
a transceiver; and
at least one processor configured to:
transmit, to a terminal via the transceiver, a dedicated radio resource control (RRC) message including random access channel resources and a second threshold for a beam failure recovery, the random access channel resources including a random access preamble for a beam failure recovery associated with a plurality of beams of the base station, and
receive, from the terminal via the transceiver, the random access preamble for the beam failure recovery of a selected beam among the plurality of beams, in case that a random access procedure for the beam failure recovery is triggered based on a measurement value being less than a first threshold and a reference signal received power (RSRP) being greater than the second threshold,
wherein the measurement value is obtained by measuring a serving beam of the base station and the RSRP is obtained by measuring at least one beam of the base station, and
wherein the random access procedure for the beam failure recovery of the selected beam among the plurality of beams is triggered based on the measurement value and the RSRP.
17. The base station of claim 16 , wherein the random access preamble is transmitted based on contention-free random access in case that the RSRP is greater than the second threshold and the random access channel resources are allocated based on the dedicated RRC message.
18. The base station of claim 16 ,
wherein the random access channel resources further include 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 random access preamble.
19. The base station of claim 16 , wherein the random access preamble is transmitted based on contention based random access in case that the RSRP is less than the second threshold.
20. The base station of claim 16 ,
wherein the random access preamble is transmitted through a beam having the RSRP above the second threshold among the at least one beam of the base station, and
wherein the measurement value and the first threshold are associated with a block error rate (BLER).