NR Sidelink DRX Group Control for Low-Power Reception

The patent implements discontinuous reception (DRX) cycles with periodic on-duration and off-duration periods. During on-duration, the UE monitors sidelink control information; during off-duration, monitoring is suspended to save power. This periodic action allows the system to maintain communication reliability during active periods while reducing power consumption during inactive periods, directly resolving the contradiction between continuous monitoring reliability and power efficiency.

The patent introduces dynamic DRX configuration parameters including on-duration timer, inactivity timer, and drx Cycle length that can be adjusted based on communication conditions. The system dynamically transitions between different DRX states (on-duration, inactivity, retransmission waiting) based on received signals and timing conditions, allowing adaptive optimization of the balance between reliability and power consumption rather than using fixed continuous monitoring.

The patent segments the resource allocation process into distinct phases: sensing phase during on-duration where resource availability is evaluated, selection phase where resources are chosen based on sensing results, and execution phase during off-duration where selected resources are used for transmission. This segmentation allows power-saving DRX operations while managing complexity by breaking down the resource allocation into manageable, time-separated tasks rather than continuous complex processing.

The patent implements sensing-based resource allocation where UEs perform sensing and resource selection during on-duration periods before entering off-duration. The sensing phase preliminarily identifies suitable resources and evaluates channel conditions, so that during the power-saving off-duration, the UE can directly use pre-selected resources without needing to perform complex real-time allocation decisions, thus achieving power savings while managing complexity through advance preparation.

The patent implements a universal DRX framework that can be applied across multiple NR sidelink use cases including V2X, public safety, and commercial applications. The same DRX mechanism with configurable parameters serves different deployment scenarios and service types, allowing battery-powered UEs to achieve extended battery life while maintaining deployment scalability through a single adaptable solution rather than requiring separate mechanisms for different use cases.

The patent employs configurable DRX parameters including on-duration timer, inactivity timer, drx Cycle length, and short/long cycle configurations that can be adjusted based on specific deployment requirements and service priorities. This parameter adaptability allows the system to optimize battery life for battery-powered UEs while maintaining compatibility and scalability across diverse deployment scenarios by tuning parameters rather than requiring fundamentally different mechanisms.