Low-Power Wake-Up Receiver for CSI Reporting in DRX

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing Channel State Information (CSI) reporting during discontinuous reception (DRX) inactive times, leading to increased power consumption and reduced battery life in user equipment (UE).

Innovation Solution

The implementation of a low-power wake-up receiver (LP-WUR) in user equipment (UE) that receives a low-power signal indicative of configuration information for CSI reporting, allowing the UE to selectively use either the LP-WUR or the main radio (MR) for CSI measurement and reporting, thereby optimizing power usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the UE continuously monitors CSI using the main radio, then channel state information is accurately captured, but power consumption increases

Engineering Contradiction:

ImproveCSI measurement accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The receiver is segmented into two distinct components: a low-power wake-up receiver (LP-WUR) for receiving wake-up signals and a main radio for full CSI measurement. This segmentation allows the UE to use minimal power for wake-up detection while reserving full power resources for CSI measurement only when needed, resolving the contradiction between continuous monitoring and power saving.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically switches between power states by using the LP-WUR to detect wake-up signals and then activating the main radio for CSI measurement only when necessary. This dynamic activation pattern allows the UE to maintain measurement capability when needed while minimizing power consumption during inactive periods.

Inventive Principle:

Principle #15Dynamics

2Loss of time

If the UE wakes up frequently to check for CSI reporting opportunities, then channel state information is updated timely, but power consumption increases

Engineering Contradiction:

ImproveCSI update timelinessVSAvoidpower consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The network entity performs preliminary action by sending wake-up signals before the UE needs to perform CSI measurement. The LP-WUR receives these advance wake-up signals and triggers the main radio to wake up only when necessary, allowing timely CSI updates without requiring the UE to continuously monitor or wake up frequently.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback mechanisms where the network entity sends wake-up signals based on CSI reporting configurations. This feedback loop allows the UE to wake up only when the network needs CSI information, optimizing the balance between update timeliness and power consumption.

Inventive Principle:

Principle #23Feedback

3Reliability

If the UE uses the main radio for all receptions including wake-up signals, then signal reception is reliable, but power consumption increases

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The receiver functionality is segmented into a dedicated LP-WUR for wake-up signal reception and a main radio for CSI measurement. The LP-WUR is specifically designed for reliable wake-up signal detection with minimal power consumption, while the main radio handles power-intensive CSI measurement only when activated, resolving the contradiction between reliability and power usage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The LP-WUR acts as an intermediary component that bridges the gap between power-saving mode and full functionality. It reliably receives wake-up signals from the network entity and triggers the main radio only when necessary, ensuring reliable signal reception for control information while minimizing overall power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250088241A1Channel state information reporting during discontinuous reception inactive periods using low-power wake up receiver

Publication Date: 2025.03.13 QUALCOMM INC

AI summary

Systems and techniques are provided for wireless communications. A process can include receiving, using a low-power wake-up receiver (LP-WUR) of a network entity (e.g., a UE), a low-power signal indicative of configuration information for a channel state information (CSI) report of the network entity. A configured receiver of the network entity can receive a CSI reference signal (CSI-RS), the configured receiver comprising the LP-WUR or a main radio (MR) of the network entity. The configured receiver can be determined based on the configuration information indicated by the low-power signal. The network entity can transmit a CSI report corresponding to one or more measurements of the CSI-RS, wherein a transmission time of the CSI report is based on the configuration information indicated by the low-power signal.