Method performed by user equipment, and user equipment
Provided in the present invention are a method performed by user equipment, and user equipment. The method performed by user equipment (UE) includes: when a periodically started timer T-active is running, the UE monitoring a physical sidelink control channel (PSCCH) and receiving sidelink control information (SCI); if the received SCI information indicates that HARQ feedback is to be performed, starting a timer T1-retx; if the received SCI information indicates that HARQ feedback is not to be performed, starting a timer T2-retx; and when the timer T1-retx and the timer T2-retx are running, the UE monitoring the PSCCH.
1. A user equipment, comprising:
a processor; and
a memory in electronic communication with the processor, wherein instructions stored in the memory are executable to:
monitor a physical sidelink control channel (PSCCH) for first sidelink control information (SCI) when a first timer is running, and
for the received first SCI,
in a case that HARQ feedback is enabled by the first SCI,
start a second timer upon an end of a physical sidelink feedback channel (PSFCH) transmission for the HARQ feedback,
start a third timer after an expiry of the second timer, and
monitor the PSCCH for second SCI when the third timer is running, and
in a case that the HARQ feedback is disabled by the first SCI,
start a fourth timer upon an end of a physical sidelink shared channel (PSSCH) transmission indicated in the first SCI,
start a fifth timer after an expiry of the fourth timer, and
monitor the PSCCH for the second SCI when the fifth timer is running.
2. A method performed by user equipment, comprising:
monitoring a physical sidelink control channel (PSCCH) for first sidelink control information (SCI) when a first timer is running, and
for the received first SCI,
in a case that HARQ feedback is enabled by the first SCI,
starting a second timer upon an end of a physical sidelink feedback channel (PSFCH) transmission for the HARQ feedback,
starting a third timer after an expiry of the second timer, and
monitoring the PSCCH for second SCI when the third timer is running, and
in a case that the HARQ feedback is disabled by the first SCI,
starting a fourth timer upon an end of a physical sidelink shared channel (PSSCH) transmission indicated in the first SCI,
starting a fifth timer after an expiry of the fourth timer, and
monitoring the PSCCH for the second SCI when the fifth timer is running.