Multi-Beam PDCCH Transmission for Robust DCI Reception
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Solution Overview
Problem
Current New Radio (NR) technologies face challenges in multi-beam physical downlink control channel (PDCCH) transmission, grant-free transmissions, and demodulation reference signal (DMRS) design for physical broadcast channel (PBCH), particularly in ensuring robust DCI reception, identifying grant-free uplink transmissions, and improving channel estimation for PBCH.
Innovation Solution
The implementation of multi-beam PDCCH transmission mechanisms, grant-free transmission methods, and advanced DMRS sequence designs for NR-CSI-RS and NR-PDSCH, including configuring monitoring occasions, quasi-co-location assumptions, and using gold sequences for improved interference management and channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-beam PDCCH transmission is implemented to improve robustness against beam pair link blocking, then DCI reception reliability is improved, but device complexity increases due to multiple monitoring configurations
Solution Approach 1:
The patent segments the PDCCH monitoring process by configuring separate monitoring occasions for common DCI and UE-specific DCI. This allows the UE to monitor different beams at different time instances, improving reliability against beam blocking while managing complexity through structured segmentation of monitoring requirements.
Solution Approach 2:
The patent implements dynamic beam selection where the UE can choose at least one beam out of M configured beams for PDCCH reception. The system adapts beam configurations dynamically based on channel conditions and blocking scenarios, allowing flexible optimization of reliability without fixed complex configurations.
2Productivity
If grant-free transmissions are configured to reduce signaling overhead, then productivity is improved, but measurement precision deteriorates due to lack of L1 signaling for activation/deactivation
Solution Approach 1:
The patent makes the DMRS serve multiple functions: it acts as both a demodulation reference signal for channel estimation and as an identification signal for grant-free transmissions. This multi-functionality allows grant-free operation with reduced signaling while maintaining measurement precision through the DMRS-based channel estimation.
Solution Approach 2:
The patent introduces DMRS as an intermediary mechanism that enables channel estimation and transmission identification without requiring explicit L1 signaling. The DMRS mediates between the need for grant-free efficiency and the requirement for accurate channel measurement.
3Measurement precision
If DMRS is mapped on every PBCH symbol to improve channel estimation, then measurement precision is improved, but loss of information increases due to higher RE overhead
Solution Approach 1:
The patent applies different DMRS mapping strategies for different locations and conditions. For PBCH, DMRS is mapped on every symbol to ensure accurate channel estimation for broadcast information. For other channels like PDSCH, the mapping can be adjusted based on local requirements, optimizing the balance between estimation accuracy and data overhead.
Solution Approach 2:
The patent changes the DMRS density parameter based on channel conditions and transmission requirements. For PBCH where high reliability is critical, DMRS is placed on every symbol. For other scenarios, the density can be reduced to minimize overhead while maintaining sufficient estimation accuracy.
4Reliability
If multiple CORESETs are configured for different beams to improve DCI reception robustness, then reliability is improved, but device complexity increases due to multiple monitoring occasions and configurations
Solution Approach 1:
The patent segments CORESET configurations by associating different CORESETs with different beams and monitoring occasions. This segmentation allows the UE to monitor multiple beams systematically without being overwhelmed by a single complex configuration, improving robustness while managing complexity through structured organization.
Data Source
AI summary
Disclosed herein are methods, systems, and devices that are associated with downlink (DL) control, grant free (GF) transmission, or initial access. Particularly, disclosed herein are multi beam physical downlink control channel (PDCCH) transmission mechanisms, grant free transmissions mechanisms, demodulation reference signal (DMRS) for physical broadcast channel (PBCH) mechanisms, and DMRS sequence design for new radio-channel state information-reference signal (NR-CSI-RS) and new radio-physical downlink shared channel (PDSCH) (NR-PDSCH), among other things.