Terminal Bandwidth Switching for CSI Measurement Power Reduction

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Solution Overview

Problem

In LTE and 5G communication systems, terminals face high power consumption when receiving downlink signals on large bandwidths, and accurately measuring channel state information (CSI) on narrow bandwidths is challenging, affecting data transmission.

Innovation Solution

A method where a base station instructs a terminal to switch between narrow and system bandwidths for CSI measurement, using multiple narrow bandwidths to measure downlink reference signals, reducing power consumption and improving CSI accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the terminal receives downlink signals on the whole system bandwidth, then the CSI measurement accuracy is improved, but the power consumption increases

Engineering Contradiction:

ImproveCSI measurement accuracyVSAvoidterminal power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent divides the system bandwidth into multiple narrow bandwidth parts (BWPs), allowing the terminal to measure CSI on segmented portions of the total bandwidth. The terminal can switch between different narrow BWPs to perform measurements, thereby reducing the instantaneous bandwidth processing requirement while maintaining comprehensive channel state coverage through multiple measurements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between narrow bandwidth configurations. The terminal can dynamically switch between different narrow BWPs based on scheduling indications from the base station, adapting its measurement bandwidth to current channel conditions and traffic requirements, thus optimizing the trade-off between measurement accuracy and power consumption.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If the terminal operates on a narrow bandwidth, then the power consumption is reduced, but the CSI measurement accuracy deteriorates

Engineering Contradiction:

Improveterminal power consumptionVSAvoidCSI measurement accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent employs periodic measurement cycles where the terminal sequentially measures channel state on different narrow bandwidth parts over time. By periodically switching between multiple narrow BWPs and aggregating measurements, the system achieves comprehensive CSI coverage while maintaining low instantaneous bandwidth and power consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent combines multiple narrow bandwidth measurements to achieve equivalent or superior CSI accuracy compared to wideband measurement. By merging measurement results from multiple narrow BWPs through appropriate processing at the base station, the system reconstructs comprehensive channel state information without requiring the terminal to process the entire system bandwidth simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If the terminal measures CSI on the whole system bandwidth, then the measurement accuracy is improved, but the device complexity increases

Engineering Contradiction:

ImproveCSI measurement accuracyVSAvoidterminal device complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the channel measurement task into multiple smaller measurements on narrow bandwidth parts. Instead of requiring the terminal to process the entire system bandwidth in one operation, the measurement function is divided into manageable segments that can be performed sequentially with lower computational complexity at each step.

Inventive Principle:

Principle #1Segmentation

4Adaptability or versatility

If the terminal switches between multiple narrow bandwidths for measurement, then the CSI measurement flexibility is improved, but the switching overhead increases

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidbandwidth switching overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent pre-configures multiple narrow bandwidth parts and their measurement parameters in advance. The base station provides ahead-of-time indications about which narrow BWP should be measured and when, allowing the terminal to prepare for bandwidth switching without last-minute processing delays. This preliminary configuration reduces the actual switching overhead during measurement execution.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11711712B2Measuring method for realizing CSI of downlink channel with reduced terminal power consumption, base station, and terminal

Publication Date: 2023.07.25 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Disclosed are a measuring method, a base station, and a terminal. The method comprises: a base station transmits to a terminal a switching message of a narrow bandwidth receiving mode, thus instructing the terminal to switch to a specified narrow bandwidth to receive information; when channel state information (CSI) of a downlink channel needs to be measured, the base station schedules the terminal to switch sequentially to at least two different measuring narrow bandwidths to measure a downlink reference signal, where the width of the narrow bandwidth and that of the at least two different measuring narrow bandwidths are less than the width of a system bandwidth. The employment of embodiments of the present invention allows the terminal to flexibly switch between the narrow bandwidth and the system bandwidth, reduces power consumption of the terminal, and implements the measurement of the CSI of the downlink channel at the same time.