Dynamic configuration of maximum number of sidelink retransmissions for data unit

A first wireless device operating in a wireless communication system, the first wireless device comprising:

• at least one transceiver;
• at least processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• receiving, via the at least one transceiver from a network, information on a first retransmission number associated with a first logical channel priority and a second retransmission number associated with a second logical channel priority;
• obtaining a sidelink grant;
• constructing a media access control (MAC) protocol data unit (PDU) containing one or more service data units (SDUs) from one or more logical channels;
• determining a retransmission number of the MAC PDU based on the first retransmission number and the second retransmission number;
• and
• performing, via the at least one transceiver to the second wireless device, transmission of the MAC PDU based on the sidelink grant up to the retransmission number of the MAC PDU.

A processing apparatus configured to operate in a wireless communication system, the processing apparatus comprising:

• at least one processor;
• and
• at least one memory coupled to the at least one processor,
• wherein the at least one processor is configured to perform operations comprising:
• obtaining information on a first retransmission number associated with a first logical channel priority and a second retransmission number associated with a second logical channel priority;
• obtaining a sidelink grant;
• constructing a media access control (MAC) protocol data unit (PDU) containing one or more service data units (SDUs) from one or more logical channels;
• and
• determining a retransmission number of the MAC PDU based on the first retransmission number and the second retransmission number.