Default Beam Operations for Uplink Transmissions in Multi-TRP Scenarios
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Solution Overview
Problem
The existing default beam operation for PUSCH/PUCCH/SRS in multi-transmission reception point (TRP) scenarios does not consider PDCCH repetition, leading to inefficiencies in spatial relation and pathloss reference signal management.
Innovation Solution
The proposed solution defines alternative methods for determining default spatial relation and pathloss reference signals for PUSCH, PUCCH, and SRS transmissions in multi-TRP scenarios, specifically considering PDCCH repetition by using TCI states of CORESETs and PDSCH, to enhance default beam operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If default beam operation is enabled for PUSCH/PUCCH/SRS without considering PDCCH repetition, then overhead is reduced and configuration is simplified, but reliability and accuracy of spatial relation management deteriorate in multi-TRP scenarios
Solution Approach 1:
The patent applies local quality by differentiating the default beam determination method based on the specific scenario (PDCCH repetition enabled or not). When PDCCH repetition is enabled in multi-TRP scenarios, the patent uses TCI states of PDCCH repetitions to determine spatial relations, while in other scenarios it uses CORESET TCI states. This localized adaptation ensures optimal reliability for each specific operating condition without unnecessarily increasing complexity in all cases.
Solution Approach 2:
The patent introduces dynamic behavior by making the default beam determination adaptive to the PDCCH repetition configuration. The system dynamically selects between different reference signal sources (PDCCH repetition TCI states vs. CORESET TCI states) based on whether PDCCH repetition is enabled, allowing the spatial relation management to flexibly respond to changing network conditions and maintain reliability across different operational modes.
2Ease of operation
If existing default beam operation is used in multi-TRP scenarios with PDCCH repetition, then system operation is simpler, but pathloss reference signal accuracy deteriorates
Solution Approach 1:
The patent applies local quality by selecting the appropriate pathloss reference signal based on the PDCCH repetition configuration. When PDCCH repetition is enabled, the system uses TCI states from PDCCH repetitions to determine pathloss reference signals, ensuring accurate measurements for each TRP. This localized approach maintains measurement precision in multi-TRP scenarios without requiring complex manual configuration.
3Device complexity
If default beam operation doesn't consider PDCCH repetition, then implementation is simpler, but uplink transmission reliability deteriorates
Solution Approach 1:
The patent introduces dynamic behavior that activates only when needed - the system dynamically determines whether to use PDCCH repetition TCI states or CORESET TCI states based on the PDCCH repetition configuration. This dynamic approach ensures uplink transmission reliability in multi-TRP scenarios with PDCCH repetition while maintaining simple implementation in other scenarios, avoiding unnecessary complexity increases throughout the system.
Data Source
AI summary
Various embodiments herein may relate to default beam operations for uplink transmissions. In particular, some embodiments are directed to default beam operations for physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH) or sounding reference signal (SRS) transmissions in multi-transmission reception point (TRP) scenarios. Other embodiments may be disclosed or claimed.