Methods and apparatuses for timing advance adjustment in uplink transmission

1. A method performed by a user equipment for wireless communication, the method comprising:

receiving a timing advance command in an uplink slot n; and

determining, according to a time when the timing advance command is received, a time for applying an uplink transmission timing adjustment starting from a start of an uplink slot n+k+1,

wherein:

k is determined according to a duration of N 1 symbols,

n, k, and N 1 are all integers, and

a value of N 1 corresponds to at least one of the following:

a physical downlink shared channel (PDSCH) decoding time defined by PDSCH processing capability 1 in response to determining that a reference processing capability assumption is true, and

a PDSCH decoding time defined by the PDSCH processing capability 1 in response to determining that a PDSCH demodulation reference signal (DM-RS) is configured, wherein:

the PDSCH decoding time is determined based on a minimum subcarrier spacing (SCS) among SCSs of all configured uplink bandwidth parts (BWPs) for all uplink carriers in a timing advance group and SCSs of all configured downlink BWPs for corresponding downlink carriers, and

N 1 is 14 in response to determining that the minimum SCS is 15 kHz.

2. The method according to claim 1 , wherein the uplink slot n is a last slot of uplink slots that overlap with one or more slots for performing PDSCH reception.

3. The method according to claim 1 , wherein,

in response to the PDSCH DM-RS being configured, the reference processing capability assumption comprises at least one of the following:

a configured value of a dmrs-AdditionalPosition in a DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeA that is equal to “pos1”; and

a configured value of the dmrs-AdditionalPosition in the DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeB that is equal to the “pos1”.

4. The method according to claim 1 , wherein the reference processing capability assumption comprises at least one of the following:

a PDSCH that is scheduled by a downlink control information (DCI) format 1_0;

the PDSCH that is scheduled by a DCI format 1_1;

the user equipment that is configured with a PDSCH mapping type A;

a demodulation reference signal (DMRS) of the PDSCH that is configured as a single-symbol DM-RS;

a duration l d in units of a number of symbols between a first orthogonal frequency division multiplexing (OFDM) symbol of a slot where the PDSCH is located and a last OFDM symbol of the PDSCH that is equal to 13;

the duration l d that is equal to 14;

a position l 1 of a second DM-RS symbol of the PDSCH that is equal to 12; and

a PDSCH decoding time N 1,0 that is equal to 14 in response to determining that the minimum SCS is 15 kHz and the PDSCH DM-RS is configured.

5. A method performed by a user equipment (UE) for wireless communication, the method comprising:

transmitting a random access preamble; and

instructing, by a higher layer of the UE, a physical layer to retransmit the random access preamble in response to the UE not detecting, in a random access response (RAR) window, a downlink control information (DCI) format 1_0 with a cyclic redundancy check (CRC) scrambled with a random access radio network temporary identifier (RA-RNTI), or in response to the UE not correctly receiving, in the RAR window, a transport block in a physical downlink shared channel (PDSCH) scheduled by the DCI format 1_0, or in response to the UE not identifying a random access preamble identity (RAPID), wherein:

a time for the UE to retransmit the random access preamble is not later than a first time after a last symbol of the RAR window or a first time after a last symbol of a PDSCH reception,

the first time is determined according to a duration of N 1 symbols,

N 1 is an integer, and

a value of N 1 corresponds to at least one of the following:

a physical downlink shared channel (PDSCH) decoding time defined by PDSCH processing capability 1 in response to determining that a reference processing capability assumption is true, and

a PDSCH decoding time defined by the PDSCH processing capability 1 in response to determining that a PDSCH demodulation reference signal (DM-RS) is configured, wherein:

the PDSCH decoding time is determined based on a minimum subcarrier spacing (SCS) among a SCS of a physical downlink control channel (PDCCH) carrying the DCI format 1_0, an SCS of a corresponding PDSCH in response to determining that the PDSCH DM-RS is configured, and an SCS of the random access preamble, and

N 1 is 14 in response to determining that the minimum SCS is 15 kHz.

6. The method according to claim 5 , wherein, in response to determining that the PDSCH DM-RS is configured, the reference processing capability assumption comprises at least one of the following:

a configured value of a dmrs-AdditionalPosition in a DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeA is equal to “pos1”; and

a configured value of the dmrs-AdditionalPosition in the DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeB is equal to the “pos1”.

7. The method according to claim 5 , wherein the reference processing capability assumption comprises at least one of the following:

the PDSCH is scheduled by a downlink control information (DCI) format 1_0;

the PDSCH is scheduled by a DCI format 1_1;

the user equipment is configured with PDSCH mapping type A;

a DM-RS of the PDSCH is configured as a single-symbol DM-RS;

a duration l d in units of a number of symbols between a first orthogonal frequency division multiplexing (OFDM) symbol of a slot where the PDSCH is located and a last OFDM symbol of the PDSCH is equal to 13;

the duration l d is equal to 14;

a position l 1 of a second DM-RS symbol of the PDSCH is equal to 12; and

a PDSCH decoding time N 1,0 is equal to 14 in response to determining that the minimum SCS is 15 kHz and the PDSCH DM-RS is configured.

8. A method performed by a user equipment for wireless communication, the method comprising:

receiving a random access response (RAR) uplink grant included in an RAR message on a physical downlink shared channel (PDSCH); and

transmitting a physical uplink shared channel (PUSCH) scheduled by the received RAR uplink grant, wherein:

a minimum time between a last symbol of the PDSCH reception and the first symbol of the PUSCH transmission is determined according to a duration of N 1 symbols, and

a value of N 1 corresponds to at least one of the following:

a PDSCH decoding time defined by PDSCH processing capability 1 in response to determining that a reference processing capability assumption is true, and

a PDSCH decoding time defined by the PDSCH processing capability 1 in response to determining that a PDSCH demodulation reference signal (DM-RS) is configured, wherein:

the PDSCH decoding time is determined based on a minimum subcarrier spacing (SCS) among SCSs of the PDSCH and the PUSCH, and

N 1 is 14 in response to determining that the minimum SCS is 15 kHz.

9. The method according to claim 8 , wherein, in response to determining that the PDSCH DM-RS is configured, the reference processing capability assumption comprises at least one of the following:

a configured value of a dmrs-AdditionalPosition in a DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeA that is equal to “pos1”; and

a configured value of the dmrs-AdditionalPosition in the DMRS-DownlinkConfig in a higher-layer parameter dmrs-DownlinkForPDSCHMappingTypeB that is equal to “pos1”.

10. The method according to claim 8 , wherein the reference processing capability assumption comprises at least one of the following:

the PDSCH that is scheduled by a downlink control information (DCI) format 1_0;

the PDSCH that is scheduled by a DCI format 1_1;

the user equipment that is configured with a PDSCH mapping type A;

a DM-RS of the PDSCH that is configured as a single-symbol DM-RS;

a duration l d in units of a number of symbols between a first orthogonal frequency division multiplexing (OFDM) symbol of a slot where the PDSCH is located and a last OFDM symbol of the PDSCH that is equal to 13;

the duration l d that is equal to 14;

a position h of a second DM-RS symbol of the PDSCH that is equal to 12; and

a PDSCH decoding time N 1,0 that is equal to 14 in response to determining that the minimum SCS is 15 kHz and the PDSCH DM-RS is configured.

11. A user equipment (UE) for wireless communication, the UE comprising:

at least one processor; and

at least one non-transitory machine-readable medium coupled to the at least one processor and storing one or more instructions that, when executed by the at least one processor, cause the UE to:

receive a timing advance command in an uplink slot n; and

determine, according to a time when the timing advance command is received, a time for applying an uplink transmission timing adjustment starting from a start of an uplink slot n+k+1,

wherein:

k is determined according to a duration of N 1 symbols,

n, k, and N 1 are all integers, and

a value of N 1 corresponds to at least one of the following:

a physical downlink shared channel (PDSCH) decoding time defined by PDSCH processing capability 1 in response to determining that a reference processing capability assumption is true, and

a PDSCH decoding time defined by the PDSCH processing capability 1 in response to determining that a PDSCH demodulation reference signal (DM-RS) is configured, wherein:

the PDSCH decoding time is determined based on a minimum subcarrier spacing (SCS) among SCSs of all configured uplink bandwidth parts (BWPs) for all uplink carriers in a timing advance group (TAG) and SCSs of all configured downlink BWPs for corresponding downlink carriers, and

N 1 is 14 in response to determining that the minimum SCS is 15 kHz.