Multi-TRP Physical Channel Reliability via CORESET Combining and DCI Timing

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Solution Overview

Problem

Existing wireless communication systems face challenges in enhancing the reliability of physical channels, particularly in multi-transmission/reception point (MTRP) operations, due to issues with downlink control information (DCI) repetition timing, transmission configuration indicator (TCI) selection, and decoding failures in physical downlink control channel (PDCCH) and physical uplink control channel (PUCCH) transmissions.

Innovation Solution

The proposed solution involves enhancing the reliability of physical channels by improving support for control resource set (CORESET) combining, optimizing DCI repetition timing, selecting appropriate TCI for data scheduled with DCI repetitions, determining PDCCH candidates from multiple beams, and detecting decoding failures with channel state information (CSI) feedback. Additionally, the solution includes activating/deactivating repetition combining, resource selection, spatial filter configuration, and multiplexing with physical uplink shared channel (PUSCH) transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DCI repetition timing is optimized for MTRP operations, then reliability of physical channels is improved, but device complexity increases due to multiple beam management and TCI selection

Engineering Contradiction:

Improvereliability of physical channelsVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the DCI transmission into multiple repetitions across different TRPs with distinct TCI states. Each repetition is independently configured with specific timing and spatial parameters, allowing the system to divide the complex MTRP operation into manageable segments that can be processed separately while collectively improving reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by pre-configuring TCI states and their associations with specific TRPs and beams before actual data transmission. The network configures multiple TCI states in advance, establishing a mapping relationship between TCI states and spatial configurations, so that during transmission, the WTRU can directly select appropriate TCI states based on pre-established rules without real-time complex decision-making

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple TCI states are configured for different TRPs, then spatial diversity is improved, but measurement and detection difficulty increases

Engineering Contradiction:

Improvespatial diversityVSAvoidmeasurement and detection difficulty

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements feedback mechanisms where the WTRU measures channel quality for multiple TCI states and reports back to the network. Based on this feedback, the network can adjust TCI state configurations and select the most appropriate TCI states for transmission, creating a closed-loop system that simplifies the measurement and detection process while maintaining spatial diversity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies partial action by configuring a limited number of TCI states (e.g., 2-4 states) rather than all possible spatial configurations. This selective configuration reduces the measurement burden on the WTRU while still providing sufficient spatial diversity for reliable MTRP operation

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If PDCCH candidates are determined from multiple beams, then decoding success rate is improved, but processing time increases

Engineering Contradiction:

Improvedecoding success rateVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-determining and configuring multiple PDCCH candidates across different beams and TRPs before actual transmission. The network configures search spaces and candidate positions in advance based on pre-established beam configurations, allowing the WTRU to quickly identify and decode the correct PDCCH without performing extensive real-time searches

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the PDCCH search space into multiple candidates distributed across different beams and TRPs. Each candidate is independently configured with specific time-frequency resources and spatial parameters, allowing parallel processing and reducing the time required to find and decode the correct PDCCH

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250192932A1Enhancements of physical channels in multi-trp

Publication Date: 2025.06.12 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Systems, methods, and instrumentalities are described herein regarding enhancements of physical channels in Multi-TRP. Reliability enhancements are provided for physical downlink control channel (PDCCH), including, for example, enhanced support for a control resource set (CORESET) combining. Reliability enhancements are provided for physical uplink control channel (PUCCH), including, for example, activation/deactivation of repetition combining, resource selection, etc. Reliability enhancements are provided for physical uplink shared channel (PUSCH), including, for example, spatial relation determination and signaling, configured and dynamic grant enhancements, etc.