Method and apparatus for beam selection and reporting in a wireless communication system
Methods, systems, and apparatuses are provided for beam selection and reporting in a wireless communication system to enhance latency reduction for Downlink (DL)/Uplink (UL) beam selection and activation. A User Equipment (UE) can monitor Physical Downlink Control Channel (PDCCH) on multiple Control Resource Sets (CORESETs) in a first cell, transmit a signaling to a network, wherein the signaling indicates information of a first beam, and monitor PDCCH on the multiple CORESETs via the first beam based on the signaling.
1 . A method of a User Equipment (UE), comprising:
monitoring Physical Downlink Control Channel (PDCCH) on multiple Control Resource Sets (CORESETs) in a first cell;
transmitting a signaling to a network, wherein the signaling includes a reference signal index associated with a first beam and a second reference signal index associated with a third beam;
monitoring PDCCH on the multiple CORESETs via the first beam based on the signaling; and
monitoring PDCCH on second multiple CORESETs via the third beam based on the signaling.
2 . The method of claim 1 , wherein the UE receives Physical Downlink Shared Channel (PDSCH) and/or transmits Physical Uplink Control Channel (PUCCH) in the first cell via the first beam based on the signaling.
3 . The method of claim 1 , wherein the UE monitors PDCCH on multiple CORESETs via the first beam in response to, or when receiving a response or acknowledgment associated with, the signaling from the network, or in response to, or when transmitting, the signaling.
4 . The method of claim 1 , wherein the UE transmits the signaling periodically or based on a request from the network.
5 . The method of claim 1 , wherein the signaling indicates beam quality of the first beam, and wherein the beam quality is Reference Signal Received Power (RSRP).
6 . The method of claim 1 , wherein the multiple CORESETs are all CORESETs configured for a first Transmission/Reception Point (TRP) of the first cell, and/or
the multiple CORESETs are CORESETs with a first value of CORESETPoolIndex associated with the first TRP of the first cell.
7 . The method of claim 1 , wherein beam quality of the first beam is higher than a threshold, and/or the beam quality of the first beam is highest among all beams indicated in the signaling.
8 . The method of claim 1 , wherein the UE transmits the signaling when beam quality of at least one second beam is lower than a threshold, wherein the UE monitors PDCCH on the multiple CORESETs via the at least one second beam before transmitting the signaling and/or the UE transmits the signaling when beam quality of at least one candidate beam is higher than a second threshold, and wherein the at least one candidate beam comprises the first beam, and/or the UE transmits the signaling when beam quality of the first beam is higher than beam quality of a second beam by an offset value, wherein the UE monitors PDCCH on the multiple CORESETs via the second beam before transmitting the signaling.
9 . The method of claim 1 , wherein the signaling provides association or mapping between the first beam and the multiple CORESETs, and/or
the signaling indicates an associated direction for the first beam, one or more associated channels or signals for the first beam, and/or an associated TRP for the first beam.
10 . The method of claim 1 , wherein the signaling provides association or mapping between the third beam and the second multiple CORESETs, and/or
the signaling indicates an associated direction for the third beam, one or more associated channels or signals for the third beam, and/or an associated TRP for the third beam.
11 . The method of claim 1 , wherein the second multiple CORESETs are all CORESETs configured for a second TRP of a second cell, and/or
a CORESET with a second value of CORESETPoolIndex is associated with the second TRP of the second cell, and/or
the first cell is the same or different than the second cell which means Physical Cell Identity (PCI) of the first cell is the same or different than the PCI of the second cell.
12 . A method of a User Equipment (UE), comprising:
monitoring Physical Downlink Control Channel (PDCCH) on first multiple Control Resource Sets (CORESETs) via a second beam and second multiple CORESETs via a fourth beam in a first cell;
transmitting a signaling to a network, wherein the signaling includes a reference signal index associated with a first beam and includes a second reference signal index associated with a third beam; and
based on the signaling:
monitoring PDCCH on the first multiple CORESETs via the first beam;
monitoring PDCCH on the second multiple CORESETs via the third beam; and
receiving Physical Downlink Shared Channel (PDSCH) and/or transmitting Physical Uplink Control Channel (PUCCH) in the first cell via at least the first beam.
13 . The method of claim 12 , wherein the first multiple CORESETs are all CORESETs configured for a first Transmission/Reception Point (TRP) of the first cell, and/or
the first multiple CORESETs are CORESETs with a first value of CORESETPoolIndex associated with the first TRP of the first cell.
14 . The method of claim 12 , wherein the UE monitors PDCCH on the first multiple CORESETs via the first beam in response to, or when receiving a response or acknowledgment associated with, the signaling from the network, or in response to, or when transmitting, the signaling.
15 . The method of claim 12 , wherein beam quality of the first beam is higher than a threshold, and/or the beam quality of the first beam is highest among all beams indicated in the signaling.
16 . The method of claim 12 , wherein the UE transmits the signaling when beam quality of the second beam is lower than a threshold, and/or the UE transmits the signaling when beam quality of the first beam is higher than beam quality of the second beam by an offset value.
17 . The method of claim 12 , wherein the signaling provides an association or mapping between the first beam and the first multiple CORESETs and an association or mapping between the third beam and the second multiple CORESETs.
18 . The method of claim 12 , wherein the second multiple CORESETs are all CORESETs configured for a second TRP of a second cell, and/or
a CORESET with a second value of CORESETPoolIndex is associated with the second TRP of the second cell, and/or
the first cell is the same or different than the second cell, which means Physical Cell Identity (PCI) of the first cell is the same or different than the PCI of the second cell.
19 . A User Equipment (UE), comprising:
a memory; and
a processor operatively coupled to the memory, wherein the processor is configured to execute a program code to:
monitor Physical Downlink Control Channel (PDCCH) on first multiple Control Resource Sets (CORESETs) via a second beam and second multiple CORESETs via a fourth beam in a first cell;
transmit a signaling to a network, wherein the signaling includes a reference signal index associated with a first beam and includes a second reference signal index associated with a third beam; and
based on the signaling:
monitor PDCCH on the first multiple CORESETs via the first beam;
monitor PDCCH on the second multiple CORESETs via the third beam; and
receive Physical Downlink Shared Channel (PDSCH) and/or transmit Physical Uplink Control Channel (PUCCH) in the first cell via at least the first beam.
20 . The UE of claim 19 , wherein the signaling provides an association or mapping between the first beam and the first multiple CORESETs and an association or mapping between the third beam and the second multiple CORESETs.