Methods and appratuses for broadcast multicast or groupcast transmission using vertical check blocks

An apparatus comprising a processing unit, the processing unit being configured to execute machine-readable instructions to cause the apparatus to:

• transmit two or more information code blocks (CBs) to a plurality of intended receiving nodes, wherein each of the two or more information CBs includes a respective set of information bits and a respective CB-specific check block encoded from the respective set of information bits;
• generate one or more cross-CB check blocks, each cross-CB check block being generated by combining at least two subsets of one or more bits each, each of the at least two subsets being a respective subset of bits of a respective one of at least two of the information CBs;
• and
• transmit at least one of the one or more cross-CB check blocks to at least one of the intended receiving nodes;
• wherein respective sets of one or more cross-CB check blocks are transmitted in respective retransmissions, for a predetermined number of retransmissions, in absence of any feedback from any of the intended receiving nodes for an initial transmission.

A computer readable medium having machine-executable instructions stored thereon, wherein the instructions, when executed by a processing unit of an apparatus, cause the apparatus to:

• transmit two or more information code blocks (CBs) to a plurality of intended receiving nodes, wherein each of the two or more information CBs includes a respective set of information bits and a respective CB-specific check block encoded from the respective set of information bits;
• generate one or more cross-CB check blocks, each cross-CB check block generated by combining at least two subsets of one or more bits each, each of the at least two subsets being a respective subset of bits of a respective one of at least two of the information CBs;
• and
• transmit at least one of the one or more cross-CB check blocks to at least one of the intended receiving nodes;
• wherein respective sets of one or more cross-CB check blocks are transmitted in respective retransmissions, for a predetermined number of retransmissions, in absence of any feedback from any of the intended receiving nodes for an initial transmission.