TCI State Switching Gap for High-Speed Train Inter-Symbol Interference

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Solution Overview

Problem

In high-speed train deployments, existing wireless cellular network technologies face challenges with inter-symbol interference during transmission configuration indicator (TCI) state switching due to large propagation delay differences between remote radio heads, leading to performance degradation in New Radio (NR) frequency range 2 (FR2) deployments.

Innovation Solution

Introducing a time gap between the old and new TCI states during active TCI state switching, either by adding one symbol or one slot to the target TCI state transmission delay, or subtracting one symbol from the old TCI state transmission time limit, to prevent inter-symbol interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If TCI state switching is performed without a time gap in high-speed train deployments, then switching speed and responsiveness are improved, but inter-symbol interference occurs due to large propagation delay differences between remote radio heads

Engineering Contradiction:

ImproveTCI state switching speedVSAvoidinter-symbol interference

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by introducing a time gap before the new TCI state becomes active. This time gap is calculated based on the propagation delay difference between remote radio heads, allowing the old signal to completely arrive at the user equipment before the new signal starts, thereby preventing inter-symbol interference while maintaining efficient switching

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the time parameter of TCI state activation by adding a configurable time gap offset. This parameter adjustment allows the system to adapt to different propagation delay conditions in high-speed train scenarios, resolving the contradiction between fast switching and interference avoidance

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a time gap is introduced between old and new TCI states to prevent inter-symbol interference, then communication reliability is improved, but switching delay increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidTCI state switching delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent optimizes the time gap parameter to be the minimum necessary value based on propagation delay calculations. By dynamically adjusting this parameter rather than using a fixed large gap, the system achieves reliable interference-free switching while minimizing the time loss during TCI state transitions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20240236957A1Techniques to avoid inter-symbol interference during TCI state switching in high-speed train deployments

Publication Date: 2024.07.11 INTEL CORP

AI summary

Various embodiments herein provide techniques to avoid inter-symbol interference during transmission configuration indicator (TCI) state switching in high-speed train (HST) deployments. For example, a gap may be added between the validity of a first TCI state and a second TCI state when switching from the first TCI state to the second TCI state in a high speed scenario (e.g., power class 6). The techniques may be used for communication in New Radio (NR) frequency range 2 (FR2).