Method and apparatus for handling sidelink discontinuous reception regarding periodic transmission in a wireless communication system

Abstract

A method and device are disclosed from the perspective of a first device. In one embodiment, the method includes the first device being configured with a Sidelink (SL) Discontinuous Reception (DRX) configuration. The method also includes the first device performing a sidelink communication with a second device. The method further includes the first device receiving a signaling, from the second device, indicating a new sidelink transmission. In addition, the method includes the first device determining whether to start or restart a timer in response to the signaling at least based on information indicated in the signaling, wherein the first device monitors sidelink control channel when the timer is running.

1 . A method of a first device, comprising:
 being configured with a Sidelink (SL) Discontinuous Reception (DRX) configuration;   performing a sidelink communication with a second device;   receiving a signaling, from the second device, indicating a new sidelink transmission; and   determining whether to start or restart a timer in response to the signaling at least based on information indicated in the signaling, wherein the first device monitors sidelink control channel when the timer is running.   
     
     
         2 . The method of  claim 1 , wherein the information is a reservation period, and the first device does not start or restart the timer if the value of the reservation period is a non-zero value. 
     
     
         3 . The method of  claim 1 , wherein the information is a reservation period, and the first device starts or restarts the timer if the value of the reservation period is zero. 
     
     
         4 . The method of  claim 1 , wherein the first device starts or restarts the timer if the information indicates to start or restart the timer and a New Data Indicator (NDI) in the signalling indicates a new sidelink transmission, wherein the information is not the NDI. 
     
     
         5 . The method of  claim 1 , wherein the signaling is a Sidelink Control Information (SCI), the signaling is transmitted via Physical Sidelink Control Channel (PSCCH), and/or the signaling is a SCI format with reserved period field. 
     
     
         6 . The method of  claim 1 , wherein the timer is at least one of an inactivity timer, an on duration timer, or a retransmission timer for SL DRX, and/or the SL DRX configuration comprises at least a configuration of the timer. 
     
     
         7 . The method of  claim 1 , wherein the first device is in active time when the timer is running, wherein the first device monitors sidelink control channel when the first device is in active time. 
     
     
         8 . A method of a first device, comprising:
 being configured with a Sidelink (SL) Discontinuous Reception (DRX) configuration;   performing a sidelink communication with a second device;   receiving a signaling, from the second device, indicating a new sidelink transmission of a first Transport Block (TB); and   determining whether to start or restart a timer in response to the signaling at least based on whether the new sidelink transmission is associated with a set of SL periodic resources for transmitting multiple TBs.   
     
     
         9 . The method of  claim 8 , wherein the first device starts or restarts the timer if the signaling is associated with a dynamic or one-shot Sidelink (SL) transmission associated with the second device, or if the new sidelink transmission is not associated with the set of SL periodic resources, or if the new sidelink transmission is performed on dynamic or non-periodic sidelink resources, or if the new sidelink transmission is not performed on one of the set of SL periodic resources, or if the first device is not indicated with the set of SL periodic resources from the second device, or if the signaling does not indicate sidelink resource reservation for a second TB. 
     
     
         10 . The method of  claim 8 , wherein the first device does not start or restart the timer if the new sidelink transmission is associated with the set of SL periodic resources for transmitting multiple TBs, or if the new sidelink transmission is performed on one of the set of SL periodic resources, or if the signaling indicates sidelink resource reservation for a second TB. 
     
     
         11 . The method of  claim 8 , wherein the set of SL periodic resources for transmitting multiple TBs is selected by the second device via autonomous resource selection mode; or
 the set of SL periodic resources for transmitting multiple TBs is associated with a configured grant configuration of the second device or associated with semi-persistent SL transmission.   
     
     
         12 . The method of  claim 8 , wherein the signaling is a Sidelink Control Information (SCI), and/or the signaling is transmitted via Physical Sidelink Control Channel (PSCCH), and/or the signaling is a SCI format with reserved period field. 
     
     
         13 . The method of  claim 8 , wherein the timer is at least one of an inactivity timer, an on duration timer, or a retransmission timer for SL DRX, and/or the SL DRX configuration comprises at least a configuration of the timer. 
     
     
         14 . The method of  claim 8 , wherein the first device is in active time when the timer is running, wherein the first device monitors sidelink control channel when the first device is in active time. 
     
     
         15 . A first device, wherein the first device is being configured with a Sidelink (SL) Discontinuous Reception (DRX) configuration, comprising:
 a control circuit;   a processor installed in the control circuit; and   a memory installed in the control circuit and operatively coupled to the processor;   wherein the processor is configured to execute a program code stored in the memory to:
 perform a sidelink communication with a second device; 
 receive a signaling, from the second device, indicating a new sidelink transmission; and 
 determine whether to start or restart a timer in response to the signaling at least based on information indicated in the signaling, wherein the first device monitors sidelink control channel when the timer is running. 
   
     
     
         16 . The first device of  claim 15 , wherein the information is a reservation period, and the first device does not start or restart the timer if the value of the reservation period is a non-zero value. 
     
     
         17 . The first device of  claim 15 , wherein the information is a reservation period, and the first device starts or restarts the timer if the value of the reservation period is zero. 
     
     
         18 . The first device of  claim 15 , wherein the first device starts or restarts the timer if the information indicates to start or restart the timer and a New data indicator (NDI) in the signalling indicates a new sidelink transmission, wherein the information is not the NDI. 
     
     
         19 . The first device of  claim 15 , wherein the signaling is a Sidelink Control Information (SCI), the signaling is transmitted via Physical Sidelink Control Channel (PSCCH), and/or the signaling is a SCI format with reserved period field. 
     
     
         20 . The first device of  claim 15 , wherein the timer is at least one of an inactivity timer, an on duration timer, or a retransmission timer for SL DRX, and/or the SL DRX configuration comprises at least a configuration of the timer, and/or
 the first device is in active time when the timer is running, wherein the first device monitors sidelink control channel when the first device is in active time.