Multi-Port PTRS-DMRS Association for NR Phase Noise Estimation
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Solution Overview
Problem
In the context of New Radio (NR) systems, the existing association between phase tracking reference signal (PTRS) antenna ports and DMRS antenna ports is inadequate when multiple repeated versions are transmitted in the same slot, leading to inaccurate phase noise estimation due to insufficient PTRS antenna ports and unclear time-frequency resources.
Innovation Solution
A method and apparatus for determining the association relationship between PTRS and DMRS antenna ports, including configuration or indication information to support multiple PTRS antenna ports for accurate phase noise estimation, and modifying transmission behaviors to ensure distinct time-frequency resources for each PTRS antenna port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple repeated versions are transmitted in the same slot using the existing PTRS-DMRS association, then transmission efficiency is improved, but phase noise estimation accuracy deteriorates due to insufficient PTRS antenna ports
Solution Approach 1:
The patent segments the PTRS antenna ports into multiple groups, where each group is associated with a specific DMRS antenna port. This segmentation allows multiple PTRS antenna ports to be used simultaneously for phase noise estimation when multiple repeated versions are transmitted, resolving the insufficiency of PTRS ports while maintaining transmission efficiency
Solution Approach 2:
The patent introduces a new dimension to the PTRS-DMRS association by defining associations across multiple antenna ports and code-division multiplexing (CDM) groups. Instead of a one-to-one mapping, the system establishes many-to-many relationships across different dimensions (antenna ports, CDM groups, and repeated versions), enabling accurate phase noise estimation for multiple noise sources
2Measurement precision
If multiple PTRS antenna ports are used for phase noise estimation, then phase noise estimation accuracy is improved, but device complexity increases due to additional configuration and resource management
Solution Approach 1:
The patent creates a universal association rule that can be applied across multiple PTRS antenna ports and DMRS antenna ports. The same association principles (based on CDM groups and port indexing) are universally applied regardless of the number of repeated versions or PTRS ports, simplifying configuration management while enabling accurate multi-port phase noise estimation
Solution Approach 2:
The patent establishes predetermined association relationships between PTRS antenna ports and DMRS antenna ports based on their indexing and CDM group memberships. These associations are configured in advance according to fixed rules, eliminating the need for dynamic configuration and reducing device complexity during operation
3Reliability
If multiple repeated versions are transmitted in one slot, then transmission reliability is improved, but the existing PTRS-DMRS association becomes unclear leading to resource allocation ambiguity
Solution Approach 1:
The patent assigns specific PTRS antenna ports to specific DMRS antenna ports based on their local characteristics (CDM group membership and port indexing). Each PTRS port is locally optimized to estimate phase noise for its associated DMRS port and corresponding repeated version, ensuring clear resource allocation without ambiguity
Solution Approach 2:
The patent uses DMRS antenna ports as intermediaries to establish the relationship between PTRS antenna ports and repeated versions. The DMRS ports serve as a mapping layer that connects PTRS resources to specific repeated versions, making the resource allocation explicit and unambiguous even when multiple versions are transmitted simultaneously
Data Source
AI summary
A transmission method and apparatus for a phase tracking reference signal. The apparatus is applicable at a terminal equipment side and includes: a first receiving unit configured to receive configuration information or indication information transmitted by a network device, the configuration information or indication information being used for indicating that a terminal equipment receives at least two versions of a transport block in a scheduling unit; and a first determining unit configured to determine an association relationship between a PTRS antenna port and a DMRS antenna port according to the configuration information, the indication information or a predefined rule.