Terminal, base station and method performed by the same in wireless communication system
The present disclosure relates to a pre-5th generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th generation (4G) communication system such as long term evolution (LTE). A method performed by the terminal in a wireless communication system is provided. The method includes receiving downlink signal including at least one of downlink data or downlink control information (DCI), determining an uplink signal to be transmitted based on the downlink signal, determining at least one of a time unit or an uplink physical channel for transmitting the uplink signal, the uplink physical channel including at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH), and transmitting the uplink signal in the determined at least one of the time unit or the uplink physical channel.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a plurality of physical downlink control channels (PDCCHs), each PDCCH including downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH);
identifying a reference point associated with a starting symbol allocated for the PDSCH;
identifying the starting symbol allocated for the PDSCH, that is relative to the reference point; and
receiving, from the base station, the PDSCH based on the starting symbol allocated for the PDSCH,
wherein in case that information associated with the reference point is configured, the reference point is a starting symbol of a PDCCH monitoring occasion where a latest received PDCCH among the plurality of PDCCHs is located.
2. The method of claim 1 , wherein the plurality of PDCCHs is received in a same slot.
3. The method of claim 2 , wherein
⌊
n
·
2
μ
PDSCH
2
μ
PDCCH
⌋
is the same for each of the plurality of PDCCHs, where n is an index of a slot where scheduling DCI is located, and μ PDSCH and μ PDCCH are configured subcarrier spacings for the PDSCH and a PDCCH respectively.
4. The method of claim 1 ,
wherein the DCI with same information is repeatedly received based on the plurality of PDCCHs, and
wherein a downlink assignment indicator (DAI) counting occasion for counting DAIs is determined based on a PDCCH monitoring occasion where a first repetition of multiple repetitions of the DCI is located.
5. The method of claim 4 , further including:
transmitting, to the base station, an uplink signal,
wherein the uplink signal includes a Hybrid Automatic Repeat request-Acknowledgement (HARQ-ACK) codebook including HARQ-ACK information for the PDSCH, and
wherein bit positions in the HARQ-ACK codebook are determined based on the DAI counting occasion.
6. The method of claim 1 ,
wherein a DAI counting occasion for counting DAIS is determined based on a PDCCH monitoring occasion where a transmission occasion of a first transmission of multiple transmissions of the DCI is located.
7. The method of claim 1 , further comprising:
receiving, from the base station, the information associated with the reference point,
wherein the information indicates whether the starting symbol of the PDCCH monitoring occasion is used as the reference point for a time domain start and length indicator value (SLIV) for the PDSCH.
8. The method of claim 1 ,
wherein in case that the information is not configured, the starting symbol allocated for the PDSCH is relative to a start of a slot allocated for the PDSCH.
9. The method of claim 1 ,
wherein a mapping type of the PDSCH is set to a type B.
10. The method of claim 1 ,
wherein a cyclic redundancy check (CRC) of the DCI is scrambled by a cell-Radio Network Temporary Identifier (C-RNTI), a Modulation and Coding Scheme-C-RNTI (MCS-C-RNTI), or a Configured Scheduling-RNTI (CS-RNTI).
11. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, a plurality of physical downlink control channels (PDCCHs), each PDCCH including downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH); and
transmitting, to the terminal, the PDSCH,
wherein a starting symbol allocated for the PDSCH is identified based on a reference point associated with the starting symbol allocated for the PDSCH,
wherein the starting symbol allocated for the PDSCH is relative to the reference point, and
wherein in case that information associated with the reference point is configured, the reference point is a starting symbol of a PDCCH monitoring occasion where a latest transmitted PDCCH among the plurality of PDCCHs is located.
12. The method of claim 11 , wherein the plurality of PDCCHs is transmitted in a same slot.
13. The method of claim 12 , wherein
⌊
n
·
2
H
POSCH
2
H
POCCH
⌋
is the same for each of the plurality of PDCCHs, where n is an index of a slot where scheduling DCI is located, and μ PDSCH and μ PDCCH are configured subcarrier spacings for the PDSCH and a PDCCH respectively.
14. The method of claim 11 ,
wherein the DCI with same information is repeatedly transmitted based on the plurality of PDCCHs, and
wherein a downlink assignment indicator (DAI) counting occasion for counting DAIs is determined based on a PDCCH monitoring occasion where a first repetition of multiple repetitions of the DCI is located.
15. The method of claim 14 , further comprising:
receiving, from the terminal, a uplink signal,
wherein the uplink signal includes a Hybrid Automatic Repeat request-Acknowledgement (HARQ-ACK) codebook including HARQ-ACK information for the PDSCH, and
wherein bit positions in the HARQ-ACK codebook are determined based on the DAI counting occasion.
16. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a base station, a plurality of physical downlink control channels (PDCCHs), each PDCCH including downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH),
identify a reference point associated with a starting symbol allocated for the PDSCH,
identify the starting symbol allocated for the PDSCH, that is relative to the reference point,
receiving, from the base station, the PDSCH based on the starting symbol allocated for the PDSCH,
wherein in case that information associated with the reference point is configured, the reference point is a starting symbol of a PDCCH monitoring occasion where a latest received PDCCH among the plurality of PDCCHs is located.
17. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a terminal, a plurality of physical downlink control channels (PDCCHs), each PDCCH including downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH), and
transmit, to the terminal, the PDSCH,
wherein a starting symbol allocated for the PDSCH is identified based on a reference point associated with the starting symbol allocated for the PDSCH,
wherein the starting symbol allocated for the PDSCH is relative to the reference point, and
wherein in case that information associated with the reference point is configured, the reference point is a starting symbol of a PDCCH monitoring occasion where a latest transmitted PDCCH among the plurality of PDCCHs is located.