Low Power Wake-Up Signal Paging Reception
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Solution Overview
Problem
In 5G/NR wireless communication systems, user equipment (UE) faces challenges in power consumption due to frequent wake-ups to monitor paging signals, which limits power saving gains despite advancements like discontinuous reception (DRX) and paging early indication (PEI), as the UE cannot fully turn off its radio for long durations.
Innovation Solution
The implementation of a low power-wake-up signal (LP-WUS) system, where an additional receiver radio monitors specific low-power signals, allowing the main receiver radio to be turned off or operate at low power for extended periods, thereby reducing power consumption by optimizing wake-up occasions based on system information provided by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE frequently wakes up to monitor paging signals, then the paging reception reliability is improved, but the power consumption increases
Solution Approach 1:
The patent segments the paging monitoring function into two parts: a low-power wake-up signal (WUS) for coarse paging indication and a full paging message for detailed information. The WUS is transmitted at a lower power level and only indicates whether paging is present, allowing the UE to make an informed decision about whether to wake up fully for complete paging reception, thus reducing unnecessary high-power wake-ups while maintaining reliable paging detection.
Solution Approach 2:
The patent implements preliminary action by having the base station transmit a wake-up signal before the actual paging message. This preliminary WUS serves as a precursor that prepares the UE by indicating whether full paging monitoring is necessary. The UE can then decide whether to activate its full reception chain for the subsequent paging message, avoiding unnecessary power consumption when no paging is present while ensuring reliable reception when needed.
2Use of energy by moving object
If the UE turns off the radio for long durations to save power, then the power consumption is reduced, but the paging detection capability deteriorates
Solution Approach 1:
The patent introduces an intermediary element - the wake-up signal (WUS) - that acts as a mediator between the UE's power-saving mode and the paging detection requirement. The WUS is a low-power signal that can be detected even when the main reception chain is in a low-power state. This intermediary WUS provides just enough information for the UE to determine whether full paging monitoring is necessary, enabling the UE to balance power savings with reliable paging detection by using the WUS as a decision-making intermediary.
3Use of energy by moving object
If additional receiver radio is added to monitor low power signals, then the power saving capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the functional requirements of different receiver components. Instead of requiring the full reception chain to operate at full power continuously, the system uses a simplified low-power signal detection mechanism for the WUS and reserves the full-power reception chain for actual paging message processing. This allows the UE to maintain power-saving capability by keeping the main receiver in a low-power state while using a simpler, lower-power detection mechanism for wake-up signals, thereby improving power savings without proportionally increasing overall device complexity.
Data Source
AI summary
Methods and apparatuses for a paging reception with low power signals in a wireless communication system. A method of a UE comprises: receiving, from a base station (BS), system information (SI); identifying, based on the SI, time occasions to monitor a low power-wake-up signal (LP-WUS) from a plurality of LP-WUSs; monitoring, based on the time occasions, the LP-WUS associated with a serving cell; determining whether the LP-WUS is detected in the time occasions; and monitoring, based on the determination that the LP-WUS is detected, at least one of a paging early indicator (PEI) and a paging message.