Method and apparatus for transmitting/receiving wireless signal in wireless communication system

A user equipment (UE) configured to receive a signal in a wireless communication system, the UE comprising:

• a transceiver;
• and
• a processor configured to control the transceiver to:
• receive information regarding one or more group radio network temporary identifiers (G-RNTIs) through higher layer signaling;
• receive a physical downlink control channel (PDCCH) based on the first SSB and the one or more G-RNTIs;
• and
• receive a physical downlink shared channel (PDSCH) based on the PDCCH,
• wherein the PDCCH received by the UE is a PDCCH for a multicast broadcast service (MBS) associated with a first G-RNTI from among the one or more G-RNTIs,
• wherein the PDSCH carries one or more codewords for the MBS,
• wherein a scrambling sequence for each codeword of the PDSCH is initialized based on a formula ‘nRNTI*215+q*214+nID’, where ‘q’ is a codeword index,
• wherein based on that the PDCCH is the PDCCH for the MBS which is received based on the first G-RNTI, the processor determines ‘nRNTI’ to be the first G-RNTI, and ‘nID’ to be a first scrambling ID,
• wherein in a case where a higher-layer parameter ‘dataScramblingIdentityPDSCH’ is configured for the MBS, the first scrambling ID is determined to be the higher-layer parameter ‘dataScramblingIdentityPDSCH’, and
• wherein in a case where the higher-layer parameter ‘dataScramblingIdentityPDSCH’ is not configured for the MBS, the first scrambling ID is determined to be a cell ID.

A device configured to control a user equipment (UE) configured to receive a signal in a wireless communication system, the device comprising:

• a memory configured to store instructions;
• and
• a processor configured to perform operations by executing the instructions,
• wherein the operations performed by the processor comprise:
• receiving information regarding one or more group radio network temporary identifiers (G-RNTIs) through higher layer signaling;
• receiving a physical downlink control channel (PDCCH) based on the first SSB and the one or more G-RNTIs;
• and
• receiving a physical downlink shared channel (PDSCH) based on the PDCCH,
• wherein the received PDCCH is a PDCCH for a multicast broadcast service (MBS) associated with a first G-RNTI from among the one or more G-RNTIs,
• wherein the PDSCH carries one or more codewords for the MBS,
• wherein a scrambling sequence for each codeword of the PDSCH is initialized based on a formula ‘nRNTI*215+q*214+nID’, where ‘q’ is a codeword index,
• wherein based on that the PDCCH is the PDCCH for the MBS which is received based on the first G-RNTI, the processor determines ‘nRNTI’ to be the first G-RNTI, and ‘nID’ to be a first scrambling ID,
• wherein in a case where a higher-layer parameter ‘dataScramblingIdentityPDSCH’ is configured for the MBS, the first scrambling ID is determined to be the higher-layer parameter ‘dataScramblingIdentityPDSCH’, and
• wherein in a case where the higher-layer parameter ‘dataScramblingIdentityPDSCH’ is not configured for the MBS, the first scrambling ID is determined to be a cell ID.

A method of transmitting a signal by a base station (BS) in a wireless communication system, the method comprising:

• transmitting information regarding one or more group radio network temporary identifiers (G-RNTIs) through higher layer signaling;
• transmitting a physical downlink control channel (PDCCH) based on the one or more G-RNTIs;
• and
• transmitting a physical downlink shared channel (PDSCH) based on the PDCCH,
• wherein the transmitted PDCCH includes a PDCCH for a multicast broadcast service (MBS) associated with a first G-RNTI among the one or more G-RNTIs,
• wherein the PDSCH carries one or more codewords for the MBS,
• wherein a scrambling sequence for each codeword of the PDSCH is initialized based on a formula ‘nRNTI*215±q*214+nID’, where ‘q’ is a codeword index,
• wherein based on that the PDCCH is the PDCCH for the MBS which is transmitted based on the first G-RNTI, the BS determines ‘nRNTI’ to be the first G-RNTI, and ‘nID’ to be a first scrambling ID,
• wherein in a case where a higher-layer parameter ‘dataScramblingIdentityPDSCH’ is configured for the MBS, the first scrambling ID is determined to be the higher-layer parameter ‘dataScramblingIdentityPDSCH’, and
• wherein in a case where the higher-layer parameter ‘dataScramblingIdentityPDSCH’ is not configured for the MBS, the first scrambling ID is determined to be a cell ID.

A base station (BS) configured to transmit a signal in a wireless communication system, the BS comprising:

• a transceiver;
• and
• a processor configured to control the transceiver to:
• transmit information regarding one or more group radio network temporary identifiers (G-RNTIs) through higher layer signaling;
• transmit a physical downlink control channel (PDCCH) based on the plurality of SSBs and the one or more G-RNTIs;
• and
• transmit a physical downlink shared channel (PDSCH) based on the PDCCH,
• wherein the transmitted PDCCH includes a PDCCH for a multicast broadcast service (MBS) associated with a first G-RNTI among the one or more G-RNTIs,
• wherein the PDSCH carries one or more codewords for the MBS,
• wherein a scrambling sequence for each codeword of the PDSCH is initialized based on a formula ‘nRNTI*215+q*214+nID’, where ‘q’ is a codeword index,
• wherein based on that the PDCCH is the PDCCH for the MBS which is transmitted based on the first G-RNTI, the BS determines ‘nRNTI’ to be the first G-RNTI, and ‘nID’ to be a first scrambling ID,
• wherein in a case where a higher-layer parameter ‘dataScramblingIdentityPDSCH’ is configured for the MBS, the first scrambling ID is determined to be the higher-layer parameter ‘dataScramblingIdentityPDSCH’, and
• wherein in a case where the higher-layer parameter ‘dataScramblingIdentityPDSCH’ is not configured for the MBS, the first scrambling ID is determined to be a cell ID.