Control Channel Repetition Across TRPs for Reliable Downlink Reception

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Solution Overview

Problem

Existing downlink signal reception in control channels is prone to interference and reliability issues, particularly in environments with multiple transmission points, leading to suboptimal performance in New Radio (NR) networks.

Innovation Solution

Implementing control channel repetition across multiple transmission reception points (TRPs) to enhance signal reliability and robustness, utilizing advanced beam management techniques and configuration parameters to optimize downlink signal reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If control channel repetition is implemented across multiple TRPs, then downlink signal reception reliability is improved, but device complexity and network configuration complexity increase

Engineering Contradiction:

Improvedownlink signal reception reliabilityVSAvoidnetwork configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control channel transmission is segmented across multiple Transmission Reception Points (TRPs), where each TRP transmits a portion of the control channel repetition. This segmentation allows the receiver to combine signals from multiple independent sources, improving reliability through diversity while distributing the complexity across multiple manageable network nodes rather than requiring a monolithic complex system

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of having a single complex centralized controller manage all control channel transmissions, the system inverts the approach by enabling distributed TRPs to autonomously transmit control channel repetitions based on standardized protocols. This inversion reduces central coordination complexity while maintaining high reliability through distributed transmission

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If control channel repetition is implemented across multiple TRPs, then downlink signal reception reliability is improved, but interference management becomes more challenging

Engineering Contradiction:

Improvedownlink signal reception reliabilityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Each TRP transmits control channel repetitions with locally optimized parameters including TRP-specific reference signals, precoding matrices, and resource allocations. This local quality approach ensures that each transmission is optimized for its specific channel conditions while maintaining orthogonality between different TRPs, thereby improving overall reliability without exacerbating interference

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system converts potential interference between multiple TRPs into a benefit by using controlled interference patterns that carry useful information. Through techniques such as interference alignment and coordinated beamforming, the signals from multiple TRPs that would otherwise interfere are transformed into constructive combinations that improve signal reliability at the receiver

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12477552B2Downlink signal reception in control channel repetition

Publication Date: 2025.11.18 OFINNO LLC

AI summary

A wireless device may receive an activation command comprising a set of at least two transmission configuration indicator (TCI) states for a control resource set (coreset) with a lowest coreset index in an active downlink bandwidth part of a cell. The wireless device may also receive downlink control information (DCI) scheduling a downlink signal. The wireless device may select a TCI state that occurs first in the set of the at least two activated TCI states of the coreset, based on a time offset between the DCI and the downlink signal being less than a threshold. In response, the wireless device may receive a downlink signal based on the selected TCI state.