Method and apparatus for handling channel state information reporting regarding sidelink discontinuous reception in a wireless communication system
A method and apparatus are disclosed. In an example from the perspective of a first device configured to discontinuously monitor one or more sidelink control channels, the first device performs a first sidelink transmission to a second device. In response to the first sidelink transmission, the first device starts or restarts a timer. The first device monitors a first sidelink control channel, from at least the second device, when the timer is running.
1. A method of a first device configured to discontinuously monitor one or more sidelink control channels, the method comprising:
performing a first sidelink transmission to a second device, wherein the first sidelink transmission indicates a channel state information (CSI) report request; and
responsive to at least one of the first sidelink transmission or the CSI report request, being in sidelink active time, for monitoring a first sidelink control channel from at least the second device, during a time between the first sidelink transmission and receiving a CSI report medium access control control element (MAC CE).
2. The method of claim 1 , comprising:
starting or restarting a timer responsive to at least one of the first sidelink transmission or the CSI report request.
3. The method of claim 2 , comprising:
stopping the timer responsive to receiving the CSI report MAC CE from the second device.
4. The method of claim 2 , wherein:
the first device is in sidelink active time when the timer is running; and
the first device monitors one or more sidelink control channels when the first device is in sidelink active time.
5. The method of claim 1 , wherein at least one of:
at least one of the first sidelink transmission or the CSI report request triggers the second device to transmit the CSI report MAC CE to the first device; or
monitoring the first sidelink control channel is performed to receive a CSI report from the second device.
6. The method of claim 2 , wherein at least one of:
a time length of the timer is at least one of specified to the first device or configured for a link between the first device and the second device;
the timer is an inactivity timer for discontinuous reception (DRX) for sidelink; or
the time length of the timer is at least one of determined or set based on a CSI report availability time.
7. The method of claim 6 , wherein at least one of:
the CSI report availability time is associated with preventing reception of an out of date CSI report; or
the CSI report availability time is at least one of specified to the first device or configured for a link between the first device and the second device.
8. The method of claim 1 , wherein the first device stops being in active time when a CSI report associated with the CSI report request is received.
9. A first device configured to discontinuously monitor one or more sidelink control channels, the first device 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 operations, the operations comprising:
performing a first sidelink transmission to a second device, wherein the first sidelink transmission indicates a channel state information (CSI) report request; and
responsive to at least one of the first sidelink transmission or the CSI report request, being in sidelink active time, for monitoring a first sidelink control channel from at least the second device, during a time between the first sidelink transmission and receiving a CSI report medium access control control element (MAC CE).
10. A method of a first device configured to discontinuously monitor one or more sidelink control channels, the method comprising:
performing a first sidelink transmission to a second device, wherein the first sidelink transmission indicates a channel state information (CSI) report request;
responsive to at least one of the first sidelink transmission or the CSI report request, being in sidelink active time, for monitoring a first sidelink control channel from at least the second device, during a time interval of a CSI report availability time; and
stopping being in active time in response to a CSI report associated with the CSI report request being received.
11. The method of claim 10 , comprising:
starting or restarting a timer responsive to at least one of the first sidelink transmission or the CSI report request.
12. The method of claim 11 , comprising:
stopping the timer responsive to receiving a CSI report medium access control control element (MAC CE) from the second device.
13. The method of claim 11 , wherein:
the first device is in sidelink active time when the timer is running; and
the first device monitors one or more sidelink control channels when the first device is in sidelink active time.
14. The method of claim 10 , wherein at least one of:
at least one of the first sidelink transmission or the CSI report request triggers the second device to transmit a CSI report medium access control control element (MAC CE) to the first device; or
monitoring the first sidelink control channel is performed to receive a CSI report from the second device.
15. The method of claim 11 , wherein at least one of:
a time length of the timer is at least one of specified to the first device or configured for a link between the first device and the second device;
the timer is an inactivity timer for discontinuous reception (DRX) for sidelink; or
the time length of the timer is at least one of determined or set based on the CSI report availability time.
16. The method of claim 10 , wherein at least one of:
the CSI report availability time is associated with preventing reception of an out of date CSI report; or
the CSI report availability time is at least one of specified to the first device or configured for a link between the first device and the second device.