PDCCH TCI State Mapping for Multi-TRP Blind Detection

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Solution Overview

Problem

Existing technologies lack a solution for determining the transmission configuration indicator (TCI) state for linked/associated PDCCH candidates in multi-TRP scenarios, particularly for PDCCH repetition and multi-chance PDCCH, and for designing CCE indices for PUCCH resources.

Innovation Solution

A method for determining the TCI state for a PDCCH candidate based on its index or the index of a control channel element (CCE) is provided, allowing the terminal device to monitor PDCCH candidates effectively, and a network device to transmit PDCCH transmissions accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PDCCH repetitions are transmitted multiple times to improve reliability, then the reliability and robustness of PDCCH is improved, but the complexity of determining TCI state and managing PUCCH resources increases

Engineering Contradiction:

Improvereliability and robustness of PDCCHVSAvoidcomplexity of determining TCI state

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables the terminal device to autonomously determine the TCI state for PDCCH candidates using pre-configured rules based on CCE index ranges and PDCCH candidate indices, without requiring complex network device intervention or additional signaling overhead for TCI state indication in repeated transmissions

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent utilizes changes in PDCCH candidate indices and CCE indices as parameters to determine different TCI states, creating a systematic mapping relationship that simplifies the determination process while supporting multiple TRP scenarios

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple TCI states are configured for multiple PDCCH candidates to support multi-TRP, then the adaptability and coverage are improved, but the device complexity and processing overhead increase

Engineering Contradiction:

Improvesupport for multi-TRP deploymentVSAvoidprocessing overhead for TCI state determination

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the PDCCH candidates into different groups based on their indices, with each group associated with specific CCE index ranges and corresponding TCI states, enabling organized management of multiple TRP resources

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network device pre-configures the terminal with multiple TCI states and the rules for determining which TCI state to use based on PDCCH candidate and CCE indices, so that the terminal can quickly determine the appropriate TCI state during operation without real-time complex processing

Inventive Principle:

Principle #10Preliminary action

3Reliability

If PUCCH resources are separately allocated for each PDCCH candidate, then the reliability of feedback transmission is improved, but the resource utilization efficiency deteriorates

Engineering Contradiction:

Improvereliability of feedback transmissionVSAvoidresource utilization efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges multiple PDCCH candidates that share the same TCI state to use a common PUCCH resource for feedback transmission, reducing the total number of PUCCH resources required while maintaining reliable feedback channels through the shared resource

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12634938B2Methods for communication, terminal device, network device and computer-readable media

Publication Date: 2026.05.19 NEC CORP

AI summary

Embodiments of the present disclosure relate to methods for communication, terminal devices, network devices and computer readable media. In the method, a terminal device determines a transmission configuration indicator (TCI) state for a physical downlink control channel (PDCCH) candidate, based on at least one of: an index of the PDCCH candidate, and an index of a control channel element (CCE) of the PDCCH candidate. The terminal device monitors the PDCCH candidate based on the TCI state. As a result, the complexity of the terminal device for blind detection or decoding is able to be reduced.