RRC-Inactive UE PLMN Reporting and DRX Power Management

The patent implements periodic Discontinuous Reception (DRX) cycles where the UE alternates between active reception periods and sleep periods. During active periods, the UE receives control information from the base station; during sleep periods, the UE powers down reception components to save energy. This periodic on/off pattern maintains connection reliability through scheduled check-ins while dramatically reducing average power consumption compared to continuous reception.

The patent dynamically adjusts the DRX cycle parameters based on communication conditions. When data transmission is active or network conditions require higher reliability, the UE uses shorter DRX cycles with more frequent check-ins. When idle and power saving is prioritized, the UE switches to longer DRX cycles with less frequent reception, thereby adapting the balance between reliability and power consumption in real-time.

The patent performs preliminary PLMN selection and reporting actions before the UE transitions to RRC-inactive mode. The UE completes the PLMN selection procedure and stores the selected PLMN identity in its memory before entering inactive state. This ensures that when the UE needs to resume connection or performs handover, the PLMN information is already available without requiring continuous monitoring or reporting during the low-power inactive period.

The UE maintains its own PLMN selection decision and stored identity independently during RRC-inactive mode without requiring active network interaction. The UE's autonomous memory retention of PLMN information allows it to self-serve the PLMN reporting function when needed, eliminating the need for continuous network-dependent PLMN reporting while in power-saving mode.