Wireless Device TCI State Update via Stored QCL Properties

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Solution Overview

Problem

Existing wireless communication systems experience slow Transmission Configuration Indicator (TCI) state updates due to the need for a wireless device to wait for a new occurrence of a reference signal after performing measurements, which negatively impacts performance.

Innovation Solution

The wireless device temporarily stores QCL properties from previous measurements, allowing the network node to update the TCI state without waiting for a new reference signal occurrence, enabling faster beam management and synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the wireless device waits for a new occurrence of the reference signal after performing measurements, then the TCI state update accuracy is ensured, but the TCI state update speed becomes slow

Engineering Contradiction:

ImproveTCI state update speedVSAvoidWaiting time for reference signal occurrence

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The wireless device performs measurements and derives QCL properties in advance during the previous TCI state, storing them for future use. When the network node needs to update the TCI state, the device can immediately apply the pre-derived QCL properties without waiting for the reference signal to occur again, thus resolving the contradiction between update speed and accuracy.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the wireless device stores QCL properties from previous measurements, then the TCI state update speed improves, but the device complexity increases

Engineering Contradiction:

ImproveTCI state update efficiencyVSAvoidStorage and management of QCL properties

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential QCL properties (such as spatial parameters, timing information) from the complete reference signal measurement data and stores only these critical parameters. This selective extraction reduces the storage burden and processing complexity while still enabling fast TCI state updates, thus resolving the contradiction between productivity and device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the network node updates the QCL source frequently to track wireless device movement, then the beam management accuracy improves, but the signaling overhead increases

Engineering Contradiction:

ImproveBeam management accuracyVSAvoidSignaling overhead for TCI updates

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

Instead of signaling complete reference signal measurement data or full TCI state configurations, the network node and wireless device use compact QCL property indicators and references to previously stored QCL properties. This copying approach allows frequent updates of beam management information with minimal signaling overhead, resolving the contradiction between reliability and information loss.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20230336234A1Fast beam switch

Publication Date: 2023.10.19 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method, system and apparatus are disclosed. According to some embodiments, a wireless device is provided. The wireless device includes processing circuitry configured to at least temporarily store at least one quasi co-located, QCL, property of at least one reference signal, RS, where the at least one RS is measured and reported while a previous Transmission Configuration Indicator (TCI) state is active, to allow for a TCI state update without having to wait for an occurrence of a reference signal associated with an updated TCI state, and apply a TCI state update based on the at least temporarily stored at least one QCL property of the at least one RS.