Dynamic configuration of maximum number of sidelink retransmissions for data unit

1. A method performed by a first wireless device adapted to operate in a wireless communication system, the method comprising:

receiving, 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);

determining a retransmission number of the MAC PDU based on the first retransmission number and the second retransmission number; and

performing, to a second wireless device, transmission of the MAC PDU based on the sidelink grant up to the retransmission number of the MAC PDU.

2. The method of claim 1 , wherein the retransmission number of the MAC PDU is a highest number among the first retransmission number and the second retransmission number.

3. The method of claim 1 , wherein the transmission of the MAC PDU is performed up to the retransmission number of the MAC PDU based on not being positively acknowledged by the second wireless device.

4. The method of claim 1 , wherein information on a first timer value associated with the first logical channel priority and a second timer value associated with the second logical channel priority is received from the network.

5. The method of claim 4 , wherein a retransmission timer value is determined among the first timer value and the second timer value, and

wherein the retransmission timer value is a highest timer value among the first timer value and the second timer value.

6. The method of claim 4 , wherein a timer starts upon performing a new transmission of the MAC PDU.

7. The method of claim 6 , wherein the transmission of the MAC PDU is performed until the timer runs up to a retransmission timer value based on not being positively acknowledged by the second wireless device.

8. The method of claim 1 , wherein the MAC PDU is constructed based on the sidelink grant.

9. The method of claim 8 , wherein the sidelink grant is autonomously created by the first wireless device and/or received from the network.

10. The method of claim 1 , wherein the first wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the first wireless device.

11. A first wireless device adapted to operate in a wireless communication system, the first wireless device comprising:

at least one transceiver;

at least one 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);

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 a second wireless device, transmission of the MAC PDU based on the sidelink grant up to the retransmission number of the MAC PDU.

12. A processing apparatus adapted to control a wireless device 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); and

determining a retransmission number of the MAC PDU based on the first retransmission number and the second retransmission number.