Sidelink DRX Configuration for Mode-1 and Mode-2 Scheduling
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Solution Overview
Problem
Existing DRX procedures for sidelink communications in 5G NR, particularly with mode 1 and mode 2 scheduling, are insufficient due to differences between Uu link and sidelink communications.
Innovation Solution
The implementation of specific DRX configuration and procedures for sidelink communications, including monitoring sidelink round trip timers and retransmission timers, to allow for discontinuous reception modes after certain timer durations if no additional grants are received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing DRX procedures for sidelink communications are used, then general discontinuous reception is supported, but specific sidelink communication requirements (mode 1 and mode 2 scheduling differences) are not adequately addressed
Solution Approach 1:
The patent segments the DRX procedure into mode-specific configurations: mode 1 scheduling DRX parameters and mode 2 scheduling DRX parameters are handled separately. This allows each mode to have optimized DRX behavior tailored to its specific communication characteristics, resolving the contradiction between adaptability and reliability.
2Reliability
If continuous monitoring is performed to ensure reliable reception, then reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring based on DRX cycles with specific timer configurations (sidelink round trip timer, sidelink retransmission timer). The UE monitors PSCCH periodically during active periods and enters sleep mode during inactive periods, achieving reliable reception while conserving power through structured periodic action.
3Use of energy by moving object
If DRX mode starts immediately after transmission, then power conservation is improved, but retransmission reliability may be compromised
Solution Approach 1:
The patent configures preliminary timer durations (sidelink round trip timer, sidelink retransmission timer) that must elapse before DRX mode can be entered. This preliminary action ensures that the UE has sufficient time to receive potential retransmissions before transitioning to power-saving mode, balancing power conservation with retransmission reliability.
Data Source
AI summary
Example implementations include a method, apparatus and computer-readable medium of wireless communication over a sidelink between a first user equipment (UE) and a second UE. The first UE may receive, from a base station, a sidelink resource configuration indicating physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH) occasions on which to monitor a PSCCH for a grant from a second UE. The first UE may determine an active time for monitoring the PSCCH based on a discontinuous reception (DRX) mode for a link with the base station, the DRX mode including an active state in which a physical downlink control channel (PDCCH) is monitored and an inactive state in which the PDCCH is not monitored. The first UE may monitor the PSCCH during one or more of the PSCCH/PSSCH occasions that coincide with the active time.