Method and apparatus for transmitting or receiving wireless signal in wireless communication system
A terminal according to an embodiment of the present disclosure may: monitor a PDCCH in a search space for a specific multicast service to be received so as to receive downlink control information (DCI) in which a CRC is scrambled by a specific RNTI; repeatedly receive a TB related to the specific multicast service on a multicast frequency part on the basis of the DCI; and transmit, after repetition of the TB, an HARQ-ACK indicating a result of decoding of the TB through a PUCCH resource indicated by the DCI, wherein the specific RNTI is a group-RNTI (G-RNTI) associated with the specific multicast service that the terminal is to receive.
1 . A method comprising:
monitoring, by a user equipment (UE), a physical downlink control channel (PDCCH) in a search space;
receiving, by the UE, downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a group-radio network temporary identifier (G-RNTI) as a result of monitoring the PDCCH;
repeatedly receiving, by the UE, a transport block (TB) for a multicast broadcast service (MBS) in a multicast bandwidth part (BWP) based on the DCI; and
transmitting, by the UE, a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the TB based on a physical uplink control channel (PUCCH) resource indicator in the DCI,
wherein, based on that a last repetition of the TB is successfully received in the UE, the UE: runs a timer and switches an active BWP from the multicast BWP to a first BWP based on the timer.
2 . The method of claim 1 , wherein the DCI includes information regarding a TB repetition number and information regarding the multicast BWP.
3 . The method of claim 1 , wherein the search space is located in the multicast BWP of the UE.
4 . The method of claim 3 , wherein the first BWP is different from the multicast BWP.
5 . The method of claim 4 , wherein the HARQ-ACK is transmitted before switching the active BWP.
6 . The method of claim 1 , wherein the search space is associated with an MBS identifier (ID).
7 . The method of claim 1 , wherein the search space is selected based on an MBS identifier (ID) from among a plurality of search spaces.
8 . The method of claim 1 , wherein the TB is related to an MBS traffic channel (MTCH).
9 . The method of claim 1 , wherein based on a failure of decoding the TB, the HARQ-ACK is set to a negative acknowledgement (NACK).
10 . A non-transitory computer-readable storage medium having stored thereon a program for executing the method of claim 1 .
11 . A user equipment (UE) comprising:
a transceiver; and
a processor configured to control the transceiver to:
monitor a physical downlink control channel (PDCCH) in a search space;
receive downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a group radio network temporary identifier (G-RNTI) as a result of monitoring the PDCCH;
repeatedly receive a transport block (TB) for a multicast broadcast service (MBS) in a multicast bandwidth part (BWP) based on the DCI; and
transmit a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the TB based on a physical uplink control channel (PUCCH) resource indicator in the DCI,
wherein, based on that a last repetition of the TB is successfully received in the UE, the UE: runs a timer and switches an active BWP from the multicast BWP to a first BWP based on the timer.
12 . A base station comprising:
a transceiver; and
a processor configured to:
generate downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a group radio network temporary identifier (G-RNTI);
transmit, to a user equipment (UE) through the transceiver, a physical downlink control channel (PDCCH) carrying the DCI in a search space;
repeatedly transmit, to the UE through the transceiver, a transport block (TB) for a multicast broadcast service (MBS) in a multicast bandwidth part (BWP) based on the DCI; and
receive, from the UE through the transceiver, a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the TB based on a physical uplink control channel (PUCCH) resource indicator in the DCI,
wherein, based on that a last repetition of the TB is successfully transmitted to the UE: the BS runs a timer and, an active BWP for the UE is switched from the multicast BWP to a first BWP based on the timer.