Multi-Panel Uplink PT-RS Segmentation for Phase Tracking
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Solution Overview
Problem
Existing wireless communication systems face challenges in enhancing phase tracking reference signals (PT-RS) for simultaneous multi-panel uplink (UL) transmission, particularly in frequency range 2 (FR2), where additional PT-RS ports and associations with PUSCH and DMRS ports are required, along with considerations for power ratios and coherent capabilities.
Innovation Solution
The proposed solution involves configuring a UE or base unit to transmit 2 or 4 PT-RS ports for 4 antenna ports codebook based PUSCH transmission, determining the mapping between PUSCH antenna ports and PT-RS ports, and associating them with DMRS ports based on predefined tables, while adjusting frequency density and power ratios according to coherent capabilities and PRBs allocated for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional PT-RS ports are added for multi-panel FR2 transmission, then phase noise estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the PT-RS ports into different sets associated with different panels. Each panel has its own PT-RS ports (e.g., PT-RS ports 0-3 for first panel, PT-RS ports 4-7 for second panel), allowing independent phase noise estimation for each panel while maintaining overall system coherence. This segmentation enables accurate phase tracking without requiring all ports to be simultaneously active.
Solution Approach 2:
The patent implements partial PT-RS port usage based on transmission requirements. Instead of always using all 8 PT-RS ports, the system activates only the necessary ports (e.g., 2 or 4 ports) depending on the number of panels and transmission mode, reducing complexity when full port utilization is not needed while maintaining sufficient phase noise estimation capability.
2Adaptability or versatility
If PT-RS ports are associated with multiple PUSCH layers and panels, then transmission versatility is improved, but mapping complexity increases
Solution Approach 1:
The patent segments the PT-RS to PUSCH/DMRS port mapping by panel. Each panel has its own PT-RS ports that are mapped to specific PUSCH layers and DMRS ports within that panel. This segmentation allows the system to handle multiple panels independently, improving versatility while managing mapping complexity through localized associations rather than global cross-panel mappings.
Solution Approach 2:
The patent makes PT-RS ports multi-functional by allowing them to be associated with multiple PUSCH layers and DMRS ports across different panels. Each PT-RS port can serve multiple purposes depending on the transmission configuration, enabling a single PT-RS port to track phase noise for multiple simultaneous transmissions, thereby improving versatility without proportionally increasing complexity.
3Productivity
If power ratio adjustments are made per layer per RE, then transmission efficiency is improved, but control complexity increases
Solution Approach 1:
The patent applies local power ratio adjustments per layer per resource element (RE) based on the specific panel and transmission conditions. Instead of using a uniform power ratio for all transmissions, the system adjusts power factors locally for each panel and layer combination, optimizing transmission efficiency for each specific case while managing complexity through standardized adjustment rules rather than custom configurations.
Data Source
AI summary
Methods and apparatuses for PT-RS enhancement are disclosed. In one embodiment, a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a configuration to transmit 2 or 4 PT-RS ports when 4 antenna ports codebook based PUSCH transmission is configured; and determine the mapping between PUSCH antenna ports and the PT-RS ports.