Low Power Wake-Up Receiver for WLAN Power Management
Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing power and bandwidth, particularly when devices with different communication protocols and hardware capabilities share resources, leading to suboptimal performance and response times.
Innovation Solution
The implementation of a low power wake-up receiver (LP-WUR) that enables devices to operate in an ultra-low power mode until receiving a wake-up packet, along with additional signaling for power management mode transitions, allowing for efficient power save protocols and improved coexistence of newer and legacy protocols in WLANs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If devices operate continuously in active mode to ensure immediate response, then response time is improved, but power consumption increases
Solution Approach 1:
The wake-up receiver dynamically transitions between active and low-power states based on incoming signals. The system activates the primary radio only when a wake-up packet is detected, rather than maintaining continuous operation. This dynamic state transition resolves the contradiction by enabling immediate response when needed while conserving power during idle periods.
Solution Approach 2:
The wake-up receiver performs preliminary signal detection before activating the main radio system. By continuously monitoring for wake-up packets in a low-power state and only activating the primary radio when necessary, the system prepares for potential communication needs without maintaining full power consumption, thus resolving the response time versus power consumption trade-off.
2Adaptability or versatility
If multiple devices with different protocols share WLAN resources, then compatibility is improved, but network performance deteriorates
Solution Approach 1:
The system segments the radio functionality into a always-on wake-up receiver and a primary radio that activates only when needed. This segmentation allows the wake-up receiver to handle protocol detection and initial communication for both legacy and modern devices, while the primary radio handles high-performance data transfer. This resolves the contradiction by isolating protocol compatibility handling from performance-critical operations.
Solution Approach 2:
The wake-up receiver acts as an intermediary between diverse protocol devices and the main radio system. It receives and processes wake-up packets from both legacy and modern protocols, then activates the primary radio accordingly. This intermediary role enables protocol compatibility without requiring the main high-performance radio to continuously operate, thus maintaining network performance while supporting multiple protocols.
Data Source
AI summary
Methods, apparatus, and computer-readable media are described to encode, by a first station, duty cycle timing for transmission to a second station via a primary connectivity radio. A wake-up radio (WUR) receiver (WURx) is enabled to receive a transmission based upon the duty cycle timing of the WURx when the primary connectivity radio is in a doze state from a perspective of the second station. A wake-up packet, received from the second station, is decoded and received by the WURx. The WURx receives a WURx transmission when in an WURx awake state. The primary connectivity radio is enabled based upon decoding the wake-up packet.