FMCW-Based Low-Power Reference Signals for Wideband Channel Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring channel state information (CSI) with low power consumption, as waking up the main radio to measure CSI reference signals increases power consumption and may not accurately utilize the narrower bandwidth capabilities of low-power wake-up radios.
Innovation Solution
The use of frequency modulated continuous wave (FMCW)-based low-power reference signals (LP-RSs) via a low-power wake-up radio (LP-WUR) allows for accurate CSI estimation and reporting with reduced power consumption by leveraging the LP-WUR's narrow bandwidth capabilities to estimate a wideband channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main radio is activated to measure CSI reference signals, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent introduces FMCW-based LP-RS as an intermediary measurement mechanism that operates through the LP-WUR. Instead of directly activating the main radio for CSI measurement, the system uses frequency-modulated continuous wave reference signals that can be processed by the low-power wake-up radio's narrow bandwidth, serving as a mediator between the need for accurate measurement and low power consumption
Solution Approach 2:
The patent changes the measurement parameters by using FMCW modulation on reference signals and leveraging the LP-WUR's narrow bandwidth capability. By transforming the measurement approach to use frequency modulation and narrowband processing, the system achieves adequate CSF measurement without requiring the main radio's full bandwidth and power consumption
2Use of energy by moving object
If the LP-WUR uses narrow bandwidth for measurement, then power consumption is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by having the LP-WUR measure channel state feedback using narrow bandwidth FMCW-based LP-RS before the main radio is activated. This preliminary measurement through the low-power radio provides sufficient CSF information to enable informed decisions about whether full main radio activation is necessary, thereby avoiding unnecessary power consumption while maintaining measurement utility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate channel state feedback (CSF) with lower power consumption by allowing UEs to measure and report CSI using LP-WURs, reducing the need for full activation of the main radio.
Implementation Method 1
The UE may measure an FMCW-based LP-RS via a narrow bandwidth and may use the frequency modulation properties of the FMCW-based LP-RS to estimate a wideband channel
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques may enable a user equipment (UE) to receive one or more frequency modulated continuous wave (FMCW)-based low power reference signals (LP-RSs) via a low power wake-up radio (LP-WUR), which may allow the UE to provide accurate channel state feedback (CSF) using the LP-WUR (e.g., without entering an active mode or waking up other components of the UE). In some aspects, the UE may measure an FMCW-based LP-RS via a narrow bandwidth and may use the frequency modulation properties of the FMCW-based LP-RS to estimate a wideband channel and report wideband CSF. In some examples, the UE may receive both a low power wake-up signal (LP-WUS) and an FMCW-based LP-RS via the LP-WUR. In some examples, the UE may receive an FMCW-based LP-RS that indicates wake-up information (e.g., in lieu of the LP-WUS).