Sidelink carrier aggregation with cross-carrier retransmission

A method of wireless communication at a receiving sidelink wireless communication device, comprising:

• detecting a transport block (TB), transmitted from a transmitting sidelink wireless communication device, on a first component carrier of a plurality of component carriers, the TB being associated with a first sidelink control information (SCI) that cross-references the TB to at least one of a TB index number or a logical hybrid automatic repeat request (HARQ) entity index number;
• mapping the TB to a logical HARQ entity corresponding to the at least one of the TB index number or the logical HARQ entity index number;
• detecting a retransmission of the TB on a second component carrier of the plurality of component carriers, the second component carrier being different from the first component carrier, the retransmission of the TB being associated with a second SCI that cross-references the TB to at least one of the TB index number or the logical HARQ entity index number;
• and
• mapping the retransmission of the TB to the logical HARQ entity corresponding to the at least one of the TB index number or the logical HARQ entity index number.

A method of cross-carrier retransmission in an unlicensed band of a wireless communication network at a transmitting sidelink wireless communication device, comprising:

• generating one or more packets, each comprising a respective transport block (TB) and a respective sidelink control information (SCI) indicating a respective component carrier of one or more component carriers designated for TB retransmission;
• performing a respective listen before talk (LBT) process on each of the one or more component carriers;
• and
• transmitting a selected packet of the one or more packets on a component carrier of the one or more component carriers based on the LBT processes.

A method of transport block (TB) retransmission at a transmitting sidelink wireless communication device in a wireless communication network, comprising:

• transmitting an initial transmission of a transport block (TB), associated with a first physical hybrid automatic repeat request (HARQ) entity, on a first carrier;
• indicating to a receiving sidelink wireless communication device a mapping of a retransmission of the TB, carried on a second carrier associated with a second physical HARQ entity, to the first physical HARQ entity;
• and
• transmitting the retransmission of the TB on the second carrier,
• wherein the second carrier is different from the first carrier and the second physical HARQ entity is different from the first physical HARQ entity.