Power-saving NR (new radio) sidelink transmission and reception method

A power-saving New Radio (NR) sidelink transmission and reception method, the method comprising:

• in a Discontinuous Reception (DRX) mode, a Transmitter user equipment (Tx-UE) transmitting an initial Transport Block (TB) in On-Duration and reserving periodic or non-periodic resources for the retransmission of the initial TB or the transmission of other TBs for the initial transmission by using a Sidelink Control Information (SCI) format, wherein a number of the periodic or non-periodic resources is from 1 to N, where N is a positive integer greater than or equal to 2, and
• configuring at least one first DRX timer, and based on the first DRX timer, the Tx-UE performing channel sensing in a slot of a sensing window and On-Duration slots, and
• configuring at least one second DRX timer, and based on the second DRX timer, a Receiver user equipment (Rx-UE) entering a wake-up state to receive the initial TB in time intervals associated with the reserved periodic or non-periodic resources and/or the On-Duration slots,
• wherein the reserved periodic or non-periodic resources are indicated by SCI and located at On-Duration and/or Off-Duration;
• wherein the On-Duration is a predetermined time interval where Tx-UE and Rx-UE are active for transmission and reception, respectively;
• wherein if the Tx-UE reserves non-periodic resources and if the Rx-UE correctly detects the SCI from Physical Sidelink Control Channel (PSCCH) but has not reserved any resources or the Rx-UE fails to detect a required SCI related to TB retransmission, the Rx-UE starts a timer drx-RetransmissionTimer, is woken up at each slot, and performs PSCCH decoding until the timer drx-RetransmissionTimer expires, or the Rx-UE receives a retransmitted SCI;
• afterwards, the Rx-UE enters a power-saving reception mode, wherein the power-saving reception mode means that the Rx-UE enters a wake-up mode in the On-Duration slots and reserved resources for receiving the PSCCH as well as decoding and receiving TB associated with the Rx-UE.