Low Power Wake-Up Receiver for Wireless Paging Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current discontinuous reception (DRX) technologies in wireless communication systems face challenges in efficiently managing power consumption and maintaining reliable connectivity, particularly in scenarios requiring long battery life and low power consumption, such as industrial sensors and wearables, where existing methods do not effectively balance power savings with timely paging and data transmission.
Innovation Solution
Implementing a dual DRX cycle with a low power wake-up receiver (WUR) and a main transceiver, where the WUR monitors a low power wake-up signal with a non-orthogonal frequency division multiplexing (non-OFDM) waveform, and upon detection, the main transceiver switches to an OFDM waveform for paging indication monitoring, allowing for extended sleep periods and reduced power usage while ensuring timely data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single long DRX cycle is used to maximize power savings, then energy consumption is reduced, but paging reliability deteriorates due to extended sleep periods
Solution Approach 1:
The patent segments the single long DRX cycle into two separate cycles: a first DRX cycle with shorter periodicity for power-saving operations and a second DRX cycle with longer periodicity for reliability monitoring. This segmentation allows the device to monitor paging indications at different intervals, ensuring both power efficiency and reliable connectivity without requiring a single extended sleep period.
Solution Approach 2:
The patent changes the periodicity parameter of DRX cycles from a single value to multiple values. By configuring different periodicities for different DRX cycles, the system can optimize power consumption using shorter cycles while maintaining reliability through longer cycles, resolving the contradiction between these two objectives.
2Reliability
If the main transceiver is used for all monitoring to ensure reliability, then connectivity is maintained, but power consumption increases
Solution Approach 1:
The patent extracts the wake-up signal monitoring function from the main transceiver and assigns it to a dedicated low-power wake-up receiver. This extraction allows the main transceiver to remain in deep sleep mode longer, significantly reducing power consumption while the separate wake-up receiver handles the reliability-critical wake-up signal detection.
Solution Approach 2:
The patent introduces a wake-up receiver as an intermediary component between the sleep state and the active transceiver. This intermediary handles the critical wake-up signal detection, allowing the main transceiver to stay powered down longer without compromising connectivity reliability, thus reducing overall power consumption.
3Measurement precision
If wake-up signal monitoring uses the main transceiver, then detection accuracy is improved, but power savings are reduced
Solution Approach 1:
The patent employs a dedicated low-power wake-up receiver that is simpler and less power-consuming than the main transceiver. This specialized receiver is designed specifically for wake-up signal detection, providing sufficient accuracy for its purpose while consuming minimal power, thus resolving the contradiction between detection accuracy and power savings.
Solution Approach 2:
The patent changes the waveform type parameter of the wake-up signal to non-OFDM, which is more suitable for low-power receiver processing. This parameter change enables the wake-up receiver to accurately detect wake-up signals without requiring the power-intensive OFDM processing capabilities of the main transceiver.
Data Source
AI summary
A method may be implemented by a wireless transmit/receive unit (WTRU). The method may comprise receiving configuration information. The configuration information may comprise information regarding a first discontinuous reception (DRX) cycle with a first periodicity and a second DRX cycle with a second periodicity. The configuration information may comprise a time offset value (T). The configuration information may comprise a threshold value for wake-up signal (WUS) detection. The configuration information may comprise a number (N) of monitoring occasions for missed WUS detections. The method may comprise monitoring for a WUS according to the first periodicity. The method may comprise monitoring for a paging indication according to the second periodicity. The method may comprise monitoring, on a condition that a WUS is not detected. for the paging indication according to the first periodicity. and receiving the paging indication. The method may comprise transmitting data over a physical random access channel (PRACH).