DMRS Port Group and PT-RS Indication for Multi-TRP 5G
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting multi-Transmission Reception Point (TRP) and multi-panel operations, particularly in indicating and managing Demodulation Reference Signals (DMRS) and Phase Tracking Reference Signals (PT-RS) across multiple antenna ports, which affects signal demodulation and phase tracking in 5G/NR networks.
Innovation Solution
The solution involves indicating DMRS port groups and PT-RS antenna ports through specific signaling mechanisms, such as using a single or multiple Downlink Control Information (DCI) messages, and configuring Transmission Configuration Indication (TCI) states to manage reference signals effectively, allowing user equipment (UE) to determine the number of DMRS port groups and PT-RS antenna ports based on quasi-co-location (QCL) types and effective code-division multiplexing (CDM) groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single TRP and single panel operation is specified, then system complexity is reduced, but adaptability to multi-TRP and multi-panel scenarios is limited
Solution Approach 1:
The patent segments the antenna ports into DMRS port groups and associates them with PT-RS antenna ports through quasi-co-location (QCL) types. This segmentation allows the system to handle multiple TRPs and panels by dividing the complex multi-antenna configuration into manageable groups that can be independently configured and indicated through DCI signaling.
Solution Approach 2:
The patent creates a universal framework where TCI states and QCL types serve multiple functions: indicating DMRS port groups, associating PT-RS antenna ports, and supporting both single and multi-TRP operations. This multi-functional approach enables the system to maintain simplicity while achieving versatility through a single unified mechanism.
2Adaptability or versatility
If multiple DMRS port groups and PT-RS antenna ports are supported, then multi-TRP and multi-panel operation is enabled, but signaling complexity increases
Solution Approach 1:
The patent merges the indication of DMRS port groups and PT-RS antenna ports into a single unified mechanism using TCI states and QCL types. Instead of requiring separate signaling for each component, the framework combines them so that one indication simultaneously specifies multiple DMRS ports and their corresponding PT-RS ports, reducing overall signaling complexity.
Solution Approach 2:
The patent introduces TCI states and QCL types as intermediary elements that mediate between the scheduler and the UE. These intermediaries carry condensed information about DMRS port groups and PT-RS antenna port associations, allowing complex multi-TRP configurations to be signaled efficiently without requiring direct complex interactions between all system components.
3Reliability
If accurate indication of DMRS and PT-RS ports is implemented, then demodulation and phase tracking performance improve, but processing requirements for UE increase
Solution Approach 1:
The patent performs preliminary configuration through higher layer signaling that establishes TCI states and QCL type associations before actual data transmission. This preliminary setup provides the UE with pre-configured reference signal port mappings, reducing the processing burden during real-time demodulation and phase tracking operations.
Solution Approach 2:
The patent uses QCL types as templates or copies that define the relationship between DMRS port groups and PT-RS antenna ports. Instead of requiring the UE to process complex port mappings in real-time, the QCL types provide standardized reference patterns that simplify the UE's signal processing by providing pre-defined spatial and temporal relationships.
Data Source
AI summary
Embodiments of the present disclosure provide for indications of demodulation reference signal port groups and phase-tracking reference signal port indications. Other embodiments may be described and claimed.