Tone-level interleaving and de-interleaving for broadcast or multicast communications

An apparatus for wireless communication at a user equipment (UE), comprising:

• a transceiver;
• a memory configured to store instructions;
• and
• one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
• camp on a wireless communication cell to receive system information including a multicast or broadcast area identifier corresponding to an area for a multicast or broadcast transmission;
• receive, from a base station, the multicast or broadcast transmission comprising a transport block that includes a plurality of code blocks including multicast or broadcast control information or data, the transport block mapped on a plurality of tones that are tone-level interleaved in a frequency domain based on a row-column interleaving operation using an interleaving structure in which elements of each column of the interleaving structure are cyclically shifted according to a cyclic shift value for the respective column;
• initialize a random or pseudo-random number generator, at least in part, with the multicast or broadcast area identifier received in the system information to determine cyclic shift values for the columns of the interleaving structure of the received multicast or broadcast transmission;
• perform tone-level de-interleaving of the plurality of tone-level interleaved tones of the multicast or broadcast transmission in the frequency domain based at least in part on determining the cyclic shift values;
• and
• obtain the multicast or broadcast control information or the data based on performing the tone-level de-interleaving of the multicast or broadcast transmission.