OOK Wake-Up Signals with Golay Sequences for Low-Power UE Detection
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Solution Overview
Problem
Existing wireless communication networks face inefficiencies in power consumption by user equipment (UEs) when in power saving modes, limiting the implementation of UEs without external power sources, such as IoT devices, due to unnecessary power consumption from periodic measurements and paging checks.
Innovation Solution
Implementing a low-power wake-up signal (LP-WUS) using on-off keying (OOK) with complementary sequences, specifically Golay sequences, to efficiently detect wake-up instructions in both time and frequency domains, allowing UEs to transition from power saving to active modes with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs perform periodic measurements and paging checks in power saving modes, then network connectivity and signal quality are maintained, but power consumption increases unnecessarily
Solution Approach 1:
The patent extracts the wake-up detection function from the main UE processor and implements it in a separate, low-power wake-up receiver. This allows the main processor to remain in deep sleep mode while a dedicated low-power component handles wake-up signal detection, thereby maintaining network connectivity without requiring the main system to remain active and consume power.
Solution Approach 2:
The patent introduces a low-power wake-up receiver as an intermediary component between the network and the main UE processor. This intermediary can detect wake-up signals in a low-power state and selectively activate the main processor only when necessary, thus maintaining connectivity while minimizing power consumption during idle periods.
2Adaptability or versatility
If UEs without external power sources are implemented, then device portability and deployment flexibility are improved, but power consumption limits must be strictly controlled
Solution Approach 1:
The patent implements periodic wake-up signal detection instead of continuous operation. The low-power wake-up receiver periodically checks for wake-up signals and remains in a low-power state between detections, enabling battery-free devices to operate with extremely low power consumption while maintaining the ability to respond to network calls.
Solution Approach 2:
The patent employs a low-power wake-up receiver that consumes minimal energy, making it suitable for battery-free or energy-harvesting devices. This approach allows devices without external power sources to function by using energy only when necessary for wake-up detection, rather than requiring continuous power supply.
3Use of energy by moving object
If OOK modulation is used for wake-up signals, then power consumption is reduced and detection simplicity is improved, but signal detection reliability in noisy environments may deteriorate
Solution Approach 1:
The patent applies complementary sequences specifically to the wake-up signal transmission, while the rest of the system can operate with simpler modulation. This localized application of complex sequences only where needed (in the wake-up signal detection) improves reliability without adding unnecessary complexity and power consumption to the entire system.
Solution Approach 2:
The patent uses complementary sequences (such as Golay sequences) that change the signal parameters to have zero autocorrelation at non-zero time shifts. This parameter change enables the receiver to distinguish the wake-up signal from noise and interference more effectively, improving detection reliability while maintaining the low-power OOK modulation approach.
Data Source
AI summary
A base station may generate a low-power (LP) wake-up signal (LP-WUS) that includes on-off keying (OOK) symbols with complementary sequences overlaying at least one of the OOK symbols. The complementary sequences may include an indication of a user equipment (UE) to transition from a power saving mode to an active mode. The base station may communicate the LP-WUS to the UE, which may cause the UE to transition from the power saving mode to an active mode. The complementary sequence may include, or be generated creating, one or more Golay complementary sequences. These and many other features and examples are described herein.