LP-WUR Receiver Switching for Cell-Edge Wakeup Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power consumption and signal monitoring, particularly when user equipment (UE) moves to the edge of a cell coverage area, leading to potential failure in waking up the main radio due to unreliable detection of wakeup signals.
Innovation Solution
A user equipment (UE) measures signal strength or quality and selectively uses a low-power wakeup receiver (LP-WUR), a main radio, or both for signal monitoring tasks such as wakeup signal (WUS) monitoring, synchronization signal block (SSB) monitoring, or radio resource management (RRM) based on measured signal strength or quality, ensuring reliable detection and preserving power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main radio is continuously activated for signal monitoring, then the reliability of wakeup signal detection is improved, but the power consumption increases
Solution Approach 1:
The signal monitoring function is segmented between two separate receivers: the low-power wakeup receiver (LP-WUR) and the main radio. The LP-WUR handles initial wakeup signal detection with minimal power consumption, while the main radio remains dormant unless activated by the LP-WUR. This segmentation allows the system to maintain detection reliability through the LP-WUR's continuous operation while avoiding the high power consumption of continuous main radio activation.
Solution Approach 2:
The LP-WUR serves as an intermediary device between the external wakeup signals and the main radio. It continuously monitors for wakeup signals and acts as a gatekeeper, only activating the main radio when a valid wakeup signal is detected. This intermediary approach ensures that the main radio is not unnecessarily activated, thereby reducing power consumption while maintaining reliable wakeup detection through the LP-WUR's continuous monitoring capability.
2Use of energy by moving object
If the low-power wakeup receiver is used for signal monitoring, then power savings are maintained, but the reliability of signal detection deteriorates at cell edges
Solution Approach 1:
The system dynamically adjusts which receiver is activated based on real-time signal conditions. The LP-WUR continuously monitors signal strength indicators (RSRP/RSRQ), and when these fall below predetermined thresholds indicating cell edge conditions, the system dynamically activates the main radio to assist with detection. This dynamic adaptation allows the system to maintain power savings during good signal conditions while ensuring detection reliability at cell edges by bringing in the more powerful main radio only when necessary.
Solution Approach 2:
The system changes operational parameters by switching between different receiver configurations based on signal quality. When signal strength is sufficient, only the LP-WUR operates with minimal power consumption. When signal strength deteriorates below thresholds, the system changes the operational state by activating the main radio, thereby changing the overall system parameters to prioritize detection reliability over power savings temporarily. This parameter change approach resolves the contradiction by allowing the system to operate in different modes depending on environmental conditions.
3Reliability
If both the low-power wakeup receiver and main radio are used simultaneously, then signal detection reliability is improved, but power consumption increases unnecessarily in good signal conditions
Solution Approach 1:
The system implements feedback mechanisms where the LP-WUR continuously measures signal strength indicators (RSRP/RSRQ) and compares them against predetermined thresholds. Based on this feedback, the system intelligently determines whether to activate the main radio or rely solely on the LP-WUR. This feedback-driven decision-making ensures that both receivers operate simultaneously only when signal conditions warrant it (at cell edges), while avoiding unnecessary dual-operation power consumption in good signal conditions. The feedback loop continuously monitors and adjusts the operational state to optimize the balance between reliability and power consumption.
Data Source
AI summary
A UE may measure a signal strength or signal quality of a serving cell. The UE may select whether to use an LP-WUR, a main radio, or both the LP-WUR and the main radio for signal monitoring based on the measured signal strength or signal quality of the serving cell. The signal monitoring may be associated with at least one of WUS monitoring, SSB monitoring, or RRM measurement. The signal strength or the signal quality of the serving cell may be measured using the main radio. The UE may receive an indication of at least one threshold from a network node. Whether to use the LP-WUR, the main radio, or both the LP-WUR and the main radio for the signal monitoring may be selected based further on the at least one threshold.