Terminal Device TTI Blanking for Multi-Connection URLLC

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Solution Overview

Problem

In multi-connection transmission scenarios for Ultra-Reliable and Low-Latency Communications (URLLC), achieving synchronization with different Timing Advance (TA) values for multiple network devices is challenging, leading to potential overlaps in Transmission Time Intervals (TTIs) that compromise transmission reliability.

Innovation Solution

A method and device for determining and blanking overlapping TTIs based on TA values, ensuring that the rest of one TTI does not overlap with another, by adjusting the transmission timing and notifying network devices of the blanked portions, thereby avoiding interference and improving reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple connections with different TA values are used for multi-connection transmission, then transmission reliability is improved through diversity gain, but TTI overlap occurs between different network devices

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidTTI timing alignment

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by determining overlapping TTIs in advance based on TA values before transmission occurs. The terminal device calculates potential overlaps between TTIs to different network devices using their respective TA values, and proactively adjusts or drops redundant transmissions to prevent actual overlaps, ensuring timing alignment is maintained.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts and removes redundant or overlapping TTI transmissions from the multi-connection transmission scheme. When overlaps are detected between TTIs to different network devices, the terminal device identifies and eliminates the redundant transmission instances, keeping only the necessary non-overlapping transmissions to maintain timing precision.

Inventive Principle:

Principle #2Taking out (Extraction)

2Manufacturing precision

If TTIs are adjusted to avoid overlap, then TTI timing alignment is improved, but transmission resources are wasted due to dropped redundant transmissions

Engineering Contradiction:

ImproveTTI timing alignmentVSAvoidtransmission resources

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent applies partial action by selectively adjusting only the overlapping portion of TTIs rather than eliminating entire transmissions. When overlaps are detected, the terminal device modifies only the specific time resources that conflict, preserving non-overlapping transmissions and minimizing resource waste while still achieving proper timing alignment.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If beamforming is applied to different network devices, then transmission reliability is improved through spatial diversity, but TTI overlap becomes more problematic due to simultaneous transmissions

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidTTI overlap interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by determining and resolving TTI overlaps before beamformed transmissions occur. The terminal device calculates potential overlaps between beamformed TTIs to different network devices using their TA values, and proactively adjusts the scheduling or drops redundant beamformed transmissions to prevent actual overlaps and interference.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11825470B2Methods and devices for multi-connection transmission

Publication Date: 2023.11.21 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method in a terminal device for transmission to at least a first network device and a second network device over bundled Transmission Time Intervals (TTIs). The method comprises determining that a first TTI for transmission to the first network device overlaps a second TTI for transmission to the second network device based on a first Timing Advance (TA) value associated with the first network device and a second TA value associated with the second network device; and blanking a portion of the first TTI, such that the rest of the first TTI does not overlap the second TTI.