D2D DRX Timing for UE Sidelink Retransmission and Power Saving

The patent implements discontinuous reception (DRX) operations where the UE periodically wakes up to monitor the network link and D2D communication link, then returns to sleep mode. This periodic monitoring approach maintains communication reliability by ensuring the UE checks for incoming data at regular intervals while significantly reducing energy consumption compared to continuous monitoring. The UE alternates between active monitoring periods and sleep periods, creating a rhythmic pattern of wake-sleep cycles that balances reliability and energy efficiency.

The patent dynamically adjusts the DRX configuration between the network link and D2D communication link based on current communication conditions. When D2D communication is active, the UE dynamically modifies its network link monitoring behavior, and vice versa. This dynamic adaptation allows the system to optimize the balance between maintaining reliable communication on both links and conserving energy, rather than using fixed monitoring schedules.

The patent segments the monitoring operations for the network link and D2D communication link into separate, coordinated DRX configurations. Instead of treating both links as a single monitoring system, the UE divides the monitoring tasks and applies distinct DRX parameters to each link type. This segmentation allows the UE to manage multiple link monitoring responsibilities while maintaining manageable device complexity through structured, separate control mechanisms.

The patent creates a universal DRX framework that can be applied to both network link and D2D communication link monitoring. The same fundamental DRX mechanism and configuration approach is used for both link types, allowing the UE to handle multiple communication functions through a unified methodology. This multi-functionality reduces device complexity by reusing the same monitoring infrastructure rather than implementing separate specialized systems for each link type.