CJT Phase Difference Feedback for Coherence Failure Detection

Solution Overview

Problem

Existing wireless communication systems face challenges in detecting phase coherence failures across multiple transmitting devices, which can impact the reliability and efficiency of coherent joint transmissions in 5G NR and other telecommunication standards.

Innovation Solution

Implementing an apparatus or method that enables the estimation and management of phase differences between signals from multiple wireless nodes, allowing for the detection and correction of phase coherence failures through the use of phase coherence modules and precoders.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phase coherence is maintained across multiple transmitting devices, then transmission reliability is improved, but system complexity increases due to the need for precise phase synchronization and coordination

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where the receiving device measures phase differences between signals from multiple transmitting devices and reports these measurements back to the transmitting devices. This feedback enables automatic phase adjustment and maintains coherence without requiring complex manual coordination between transmitters, thus improving reliability while managing system complexity through automated closed-loop control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces a receiving device as an intermediary that performs phase difference measurement and reporting functions. This intermediary acts as a mediator between multiple transmitting devices, enabling them to maintain phase coherence without direct complex interaction between themselves. The receiving device consolidates the coordination function, simplifying the overall system architecture while ensuring reliable coherent transmission

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If phase difference estimation is implemented between multiple wireless nodes, then phase coherence failure detection is improved, but measurement precision requirements increase

Engineering Contradiction:

Improvephase coherence failure detectionVSAvoidphase difference measurement precision

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent employs preliminary actions by having the receiving device continuously measure and report phase differences before actual transmission failures occur. By proactively monitoring phase relationships and reporting deviations early, the system can detect coherence failures in advance and take corrective action, improving detection reliability while allowing for reasonable measurement precision thresholds rather than requiring extremely precise real-time measurements

Inventive Principle:

Principle #10Preliminary action

3Productivity

If coherent joint transmission is used across multiple wireless nodes, then transmission efficiency is improved, but the difficulty of detecting and measuring phase coherence increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidphase coherence detection difficulty

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements feedback mechanisms where the receiving device measures phase differences between signals from multiple transmitting devices and reports these measurements back to the transmitting devices. This feedback enables automatic phase adjustment and maintains coherence without requiring complex manual coordination between transmitters, thus improving reliability while managing system complexity through automated closed-loop control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces a receiving device as an intermediary that performs phase difference measurement and reporting functions. This intermediary acts as a mediator between multiple transmitting devices, enabling them to maintain phase coherence without direct complex interaction between themselves. The receiving device consolidates the coordination function, simplifying the overall system architecture while ensuring reliable coherent transmission

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12550088B2Failure detection in coherent joint transmission (CJT)

Publication Date: 2026.02.10 QUALCOMM INC

AI summary

Aspects of the disclosure are directed to a user equipment (UE) configured for detecting phase coherence failure in coherent joint transmissions (CJTs) from multiple wireless nodes (e.g., transmission/reception points (TRPs) and/or base stations). In some examples, the UE is configured to obtain signaling from a plurality of wireless nodes, the signaling including a first signal from a first wireless node of the plurality of wireless nodes and a second signal from a second wireless node of the plurality of wireless nodes. The UE is also configured to estimate a phase difference between the first signal and the second signal. In some examples, the UE is configured to output, for transmission to at least one of the first wireless node or the second wireless node, an indication of the estimated phase difference.