16.10.5.7 Physical Layer

A CFR configured by RRCReconfiguration message is defined for multicast scheduling as an 'MBS frequency region' with a number of contiguous PRBs confined within and with the same numerology as the DL BWP, and multicast scheduling may have specific characteristics (e.g., PDCCH, PDSCH and SPS configurations). The CFR for the multicast reception in RRC_INACTIVE state and the CFR for broadcast can be configured differently. If one CFR is not completely contained within the other CFR, the UE in RRC_INACTIVE state is not required to receive both broadcast and multicast simultaneously.

Slot-level repetition is optionally supported for multicast MTCH reception in RRC_INACTIVE state. The maximum number of MIMO layers is one for MBS multicast scheduling for UEs in the RRC_INACTIVE state.

Two HARQ-ACK reporting modes are defined for MBS:

• For the first HARQ-ACK reporting mode, the UE generates HARQ-ACK information with ACK value when a UE correctly decodes a transport block or detects a DCI format indicating an SPS PDSCH release; otherwise, the UE generates HARQ-ACK information with NACK value.
• For the second HARQ-ACK reporting mode, the UE does not transmit a PUCCH that would include only HARQ-ACK information with ACK values.

HARQ-ACK feedback for multicast can be enabled or disabled by higher layer configuration per G-RNTI or per G-CS-RNTI and/or indication in the DCI scheduling multicast transmission.

HARQ feedback is not supported for MBS multicast session data reception for UEs in RRC_INACTIVE state.