CSI Measurement Timing for DRX-DTX Channel Reporting

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Solution Overview

Problem

In new radio (NR) communication systems with cell discontinuous transmission (DTX) and reception (DRX), time restrictions on channel state information (CSI) measurement can lead to prolonged CSI unavailability, affecting communication performance.

Innovation Solution

The terminal device measures and reports CSI during active times of cell DTX and DRX using CSI-RS transmission occasions that are not later than a slot closest to the CSI transmission occasion, allowing CSI measurement even in inactive periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If cell DTX and cell DRX are used to reduce power consumption, then power consumption of network device is reduced, but CSI availability period is shortened

Engineering Contradiction:

Improvepower consumptionVSAvoidCSI availability period

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of moving object

Solution Approach 1:

The terminal device performs CSI measurement in advance during the active time of cell DTX, before the inactive period begins. This preliminary measurement action ensures that CSI is available when needed, even though the network device will be in inactive state later, thus resolving the contradiction between power saving and CSI availability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuous CSI measurement capability by utilizing the active time windows of cell DTX. Although the network device enters inactive periods, the terminal continuously prepares CSI measurements during active periods, ensuring the useful action of CSI reporting continues without interruption despite the discontinuous transmission/reception pattern.

Inventive Principle:

Principle #20Continuity of useful action

2Device complexity

If time restriction on CSI measurement is applied, then measurement timing is constrained, but CSI reporting frequency is reduced

Engineering Contradiction:

Improvemeasurement timing constraintVSAvoidCSI reporting frequency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent dynamically adapts the CSI measurement timing by identifying the closest CSI-RS transmission occasion that is not later than the reference resource slot. This dynamic timing adjustment allows the system to flexibly handle time restrictions while maintaining appropriate CSI reporting frequency, resolving the contradiction between measurement constraints and reporting productivity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260067045A1Channel State Information Measurement Method and Communication Apparatus

Publication Date: 2026.03.05 HUAWEI TECH CO LTD

AI summary

A terminal device receives a first CSI-RS from a network device on a first CSI-RS transmission occasion in an active time of cell DTX; and sends first CSI to the network device on a first CSI transmission occasion in an active time of cell DRX, where the first CSI is obtained through measurement of the first CSI-RS, the first CSI-RS transmission occasion is not later than a slot in which a reference resource is located and that is closest to the first CSI transmission occasion and in the active time of cell DTX.