Sidelink CSI Reporting Across DRX On-Duration Periods
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Solution Overview
Problem
Existing sidelink communication systems face challenges in efficiently reporting channel state information (CSI) while considering discontinuous reception (DRX) operations, leading to increased power consumption and potential delays in CSI reporting.
Innovation Solution
A method and apparatus for reporting CSI in sidelink communication that involves receiving DRX configuration information, transmitting sidelink control information (SCI) to request a CSI report, and receiving the CSI report during an on-duration period based on the DRX configuration, with optional indicators to maintain the on-duration period or adjust latency times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX operation is implemented to save power, then power consumption is reduced, but CSI reporting delays increase
Solution Approach 1:
The first UE transmits a CSI request indicator in advance during its on-duration period, allowing the second UE to prepare and transmit the CSI report in the next on-duration period. This preliminary action ensures that CSI reporting is timed to coincide with when the first UE is awake, avoiding delays while maintaining power-saving DRX operations.
Solution Approach 2:
The system dynamically adjusts the timing of CSI reports based on the DRX cycle and on-duration period configurations. The CSI report timing is made flexible to adapt to the variable wake-up schedules of UEs, allowing the system to optimize between power consumption and reporting timeliness based on current operational conditions.
2Loss of time
If DRX cycle is shortened to reduce CSI reporting delays, then CSI reporting delay is reduced, but power consumption increases
Solution Approach 1:
The SCI message acts as an intermediary mechanism that carries the CSI request indicator from the first UE to the second UE. This allows the first UE to trigger CSI reporting without needing to remain continuously awake, as the request is embedded in the scheduled SCI transmission, thus avoiding the need to shorten the DRX cycle.
Solution Approach 2:
The system utilizes the periodic nature of DRX on-duration periods to schedule CSI reporting. By aligning CSI report transmission with the periodic wake-up intervals, the system maintains efficient power consumption while ensuring CSI is reported at regular, predictable intervals without requiring continuous monitoring.
3Reliability
If continuous monitoring is performed to ensure timely CSI reception, then CSI reporting reliability is improved, but power consumption increases
Solution Approach 1:
The first UE performs preliminary actions by transmitting the CSI request indicator in advance during its on-duration period. This allows the second UE to prepare the CSI report beforehand, ensuring reliable delivery when the first UE wakes up, without requiring continuous monitoring.
Solution Approach 2:
The system implements feedback mechanisms where the first UE monitors for CSI reports during its on-duration periods. This targeted feedback approach ensures reliable CSI reception during active periods while allowing the UE to enter low-power sleep mode during off-duration periods, balancing reliability and power consumption.
Data Source
AI summary
A method of a first user equipment (UE) may include receiving, from a base station, discontinuous reception (DRX) configuration information; transmitting, to a second UE, sidelink control information (SCI) including information requesting a channel state information (CSI) report; and receiving, from the second UE, the CSI report in an on-duration period based on the DRX configuration information.