Sidelink discontinuous reception configuration

An apparatus comprising a first user equipment, the apparatus further comprises:

• a processor that determines at least one parameter for a sidelink discontinuous reception configuration;
• a transmitter that transmits the at least one parameter for the sidelink discontinuous reception configuration to a second user equipment;
• and
• a receiver that receives feedback from the second user equipment indicating acceptance of the at least one parameter for the sidelink discontinuous reception configuration.

An apparatus comprising:

• a processor that accesses a sidelink discontinuous reception configuration, wherein the sidelink discontinuous reception configuration comprises an offset for an on-duration, an on-duration timer, and a periodicity;
• a transmitter;
• and
• a receiver, wherein the transmitter transmits sidelink data, the receiver receives the sidelink data, or a combination thereof;
• wherein:
• in response to the transmitter transmitting sidelink data, the receiver receiving the sidelink data, or a combination thereof, the processor starts a sidelink inactivity timer;
• the processor restarts the sidelink inactivity timer in response to:
• indicating a negative acknowledgement on a physical uplink control channel to request a retransmission grant to a base station;
• indicating an acknowledgement on the physical uplink control channel and in response to having a non-empty sidelink buffer to the base station;
• receiving hybrid automatic repeat request feedback on a physical sidelink feedback channel from a sidelink receiver user equipment;
• transmitting a sidelink scheduling request to a base station;
• transmitting a sidelink buffer status report to the base station;
• requesting a channel state information report on sidelink from a peer user equipment;
• receiving a request for a channel state information report on sidelink from a peer user equipment;
• receiving sidelink control information from the sidelink transmitter user equipment;
• receiving data from the sidelink transmitter user equipment;
• transmitting a physical sidelink feedback channel negative acknowledgement feedback to the sidelink transmitter user equipment;
• transmitting sidelink control information requesting sidelink physical sidelink feedback channel feedback;
• transmitting non-last sidelink control information while performing blind re-transmissions;
• transmitting non-last data while performing blind re-transmissions;
• a sync source using a value of a sidelink inactivity timer greater than a predetermined value;
• or some combination thereof.