Adaptive Wake-Up Signal Bandwidth Control
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Solution Overview
Problem
Existing wake-up signals for wireless communication devices face challenges in detection under non-favorable reception conditions while maintaining power efficiency, particularly due to poor sensitivity and limited transmission power.
Innovation Solution
The method involves dynamically controlling the bandwidth of the wake-up signal based on reception conditions, using a channel selection filter with adaptive bandwidth to enhance signal quality and power efficiency, allowing for wider bandwidths in poor conditions and narrower bandwidths in favorable conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed narrow bandwidth is used for wake-up signals, then power consumption is reduced, but detection reliability deteriorates under non-favorable reception conditions
Solution Approach 1:
The patent applies dynamics by making the wake-up signal bandwidth adjustable rather than fixed. The system dynamically switches between narrow bandwidth mode (for low power consumption in favorable conditions) and wide bandwidth mode (for improved detection reliability in non-favorable conditions), resolving the contradiction between power savings and detection reliability through adaptive operation.
Solution Approach 2:
The patent changes the bandwidth parameter of the wake-up signal based on reception conditions. By monitoring signal quality metrics and adjusting the bandwidth parameter accordingly, the system optimizes the trade-off between power consumption and detection reliability, enabling reliable detection when needed while maintaining low power consumption during normal operation.
2Reliability
If transmission power is increased to improve detection range, then detection reliability improves, but power efficiency deteriorates
Solution Approach 1:
The patent applies local quality by concentrating transmission energy into a narrow bandwidth when conditions permit, rather than distributing it across a wide bandwidth. This localized energy concentration achieves effective detection range with lower total transmission energy, improving power efficiency while maintaining detection reliability through targeted energy delivery.
3Reliability
If a wide bandwidth channel selection filter is used, then detection reliability improves in poor conditions, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the bandwidth of the channel selection filter based on real-time reception conditions. In favorable conditions, a narrow bandwidth filter is used to minimize power consumption. When poor reception conditions are detected, the filter bandwidth is widened to improve signal detection reliability, thus resolving the contradiction through adaptive filtering.
Solution Approach 2:
The system employs feedback mechanisms where the receiver monitors signal quality and feeds this information back to adjust the filter bandwidth. This closed-loop control enables the system to automatically optimize between power consumption and detection reliability based on actual reception conditions, ensuring reliable detection when needed while maintaining low power consumption during normal operation.
Data Source
AI summary
Embodiments include methods for a wireless communication device comprising a main receiver and a wake-up receiver (WUR) having a channel selective filter. Such methods include determining a correlation metric for the WUR, based on the following: a signal received via the WUR using the channel selective filter configured according to a first one of a plurality of available bandwidths, and a reference signal that is representative of a wake-up signal (WUS) transmitted by an access point node. Such methods include detecting a WUS included in the received signal based on the correlation metric in relation to a first threshold, and in response to detecting the WUS, selecting a second one of the available bandwidths for the channel selective filter, based on the correlation metric in relation to a second threshold. Other embodiments include complementary methods for an access point node, as well as apparatus configured to perform such methods.