Method for transmitting/receiving data in wireless communication system, and device for supporting same
The disclosure proposes a method for transmitting/receiving data in a wireless communication system and apparatus for supporting the same. Specifically, a method of transmitting an uplink data channel by a user equipment (UE) in a wireless communication system comprises receiving, from a base station, first downlink control information for scheduling an uplink data channel in an nth transmission time unit, receiving, from the base station, second downlink control information for scheduling an uplink data channel in an n+kth transmission time unit, and when information by the first downlink control information is inconsistent with information by the second downlink control information, transmitting an uplink data channel which is based on the first downlink control information to the base station, wherein the second downlink control information may be discarded by the UE.
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, first downlink control information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) in an n-th transmission time unit, wherein the first DCI comprises a first DMRS pattern field of 2 bits that indicates a demodulation reference signal (DMRS) transmission in an initial symbol of an (n+k)-th transmission time unit;
receiving, from the base station, second DCI for scheduling the PUSCH in the (n+k)-th transmission time unit, where k is an integer greater than or equal to 1, and wherein the second DCI includes a second DMRS pattern field of 2 bits,
wherein the first DCI further comprises first information regarding at least one of a cyclic shift, an Interleaved Frequency Division Multiple Access (IFDMA) comb, resource allocation, precoding, or a number of layers;
based on the second DMRS pattern field in the second DCI not indicating any DMRS transmission in the initial symbol of the (n+k)-th transmission time unit:
discarding the second DCI; and
based on the second DMRS pattern field in the second DCI indicating the DMRS transmission in the initial symbol of the (n+k)-th transmission time unit, with the second DCI further comprising second information regarding at least one of a cyclic shift, an IFDMA comb, resource allocation, precoding, or a number of layers:
based on the first information in the first DCI being inconsistent with the second information in the second DCI:
discarding the second DCI.
2. The method of claim 1 , wherein the k is 1, and
wherein the nth transmission time unit is placed continuously with the (n+k)-th transmission time unit.
3. The method of claim 1 , wherein the nth transmission time unit and the (n+k)-th transmission time unit each are a subslot including two or three orthogonal frequency division multiplexing (OFDM) symbols.
4. A user equipment (UE) in a wireless communication system, the UE comprising:
at least one transceiver for transmitting or receiving a wireless signal; and
at least one processor functionally connected with the at least one transceiver, wherein the at least one processor performs control to:
receive, from a base station, first downlink control information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) in an n-th transmission time unit, wherein the first DCI comprises a first DMRS pattern field of 2 bits that indicates a demodulation reference signal (DMRS) transmission in an initial symbol of an (n+k)-th transmission time unit,
receive, from the base station, second DCI for scheduling the PUSCH in the (n+k)-th transmission time unit, where k is an integer greater than or equal to 1, and wherein the second DCI includes a second DMRS pattern field of 2 bits,
wherein the first DCI further comprises first information regarding at least one of a cyclic shift, an Interleaved Frequency Division Multiple Access (IFDMA) comb, resource allocation, precoding, or a number of layers,
based on the second DMRS pattern field in the second DCI not indicating any DMRS transmission in the initial symbol of the (n+k)-th transmission time unit:
discard the second DCI, and
based on the second DMRS pattern field in the second DCI indicating the DMRS transmission in the initial symbol of the (n+k)-th transmission time unit, with the second DCI further comprising second information regarding at least one of a cyclic shift, an IFDMA comb, resource allocation, precoding, or a number of layers:
based on the first information in the first DCI being inconsistent with the second information in the second DCI:
discard the second DCI.
5. A base station in a wireless communication system, the base station comprising:
at least one transceiver for transmitting or receiving a wireless signal; and
at least one processor functionally connected with the at least one transceiver, wherein the at least one processor performs control to:
transmit, to a user equipment (UE), first downlink control information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) in an n-th transmission time unit, wherein the first DCI comprises a first DMRS pattern field of 2 bits that indicates a demodulation reference signal (DMRS) transmission in an initial symbol of an (n+k)-th transmission time unit,
transmit, to the UE, second DCI for scheduling the PUSCH in the (n+k)-th transmission time unit, where k is an integer greater than or equal to 1, and wherein the second DCI includes a second DMRS pattern field of 2 bits,
wherein the first DCI further comprises first information regarding at least one of a cyclic shift, an Interleaved Frequency Division Multiple Access (IFDMA) comb, resource allocation, precoding, or a number of layers,
based on the second DMRS pattern field in the second DCI not indicating any DMRS transmission in the initial symbol of the (n+k)-th transmission time unit:
discard the second DCI, and
based on the second DMRS pattern field in the second DCI indicating the DMRS transmission in the initial symbol of the (n+k)-th transmission time unit, with the second DCI further comprising second information regarding at least one of a cyclic shift, an IFDMA comb, resource allocation, precoding, or a number of layers:
based on the first information in the first DCI being inconsistent with the second information in the second DCI:
discard the second DCI.
6. The method of claim 1 , wherein the first information includes information regarding a cyclic shift.
7. The method of claim 1 , wherein the first information includes information regarding an Interleaved Frequency Division Multiple Access (IFDMA) comb.
8. The method of claim 1 , wherein the first information includes information regarding resource allocation.
9. The method of claim 1 , wherein the first information includes information regarding precoding.
10. The method of claim 1 , wherein the first information includes information regarding a number of layers.
11. The method of claim 1 , wherein the second information includes information regarding a cyclic shift.
12. The method of claim 1 , wherein the second information includes information regarding an Interleaved Frequency Division Multiple Access (IFDMA) comb.
13. The method of claim 1 , wherein the second information includes information regarding resource allocation.
14. The method of claim 1 , wherein the second information includes information regarding precoding.
15. The method of claim 1 , wherein the second information includes information regarding a number of layers.