PTRS Antenna Port Mapping for Multi-TRP Phase Noise Estimation
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Solution Overview
Problem
In the context of NR systems, when multiple repeated versions of data channels are transmitted in the same slot, the existing association between PTRS antenna ports and DMRS antenna ports is insufficient, leading to inaccurate phase noise estimation due to an insufficient number of PTRS antenna ports and unclear time-frequency transmission resources.
Innovation Solution
The terminal equipment determines the association relationship between PTRS antenna ports and DMRS antenna ports based on configuration or indication information from the network device, or a predefined rule, enabling multiple PTRS antenna ports to estimate phase noises from multiple noise sources accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple repeated versions of data channels are transmitted in the same slot using existing PTRS-DMRS association, then transmission reliability is improved, but phase noise estimation accuracy deteriorates due to insufficient PTRS antenna ports
Solution Approach 1:
The patent segments the association relationship between PTRS antenna ports and DMRS antenna ports by introducing a new mapping rule where PTRS antenna ports are associated with SSB (Synchronization Signal Block) instead of DMRS. This segmentation allows multiple PTRS antenna ports to be independently configured and mapped to different SSBs, enabling accurate phase noise estimation for multiple TRPs while maintaining transmission reliability through repeated versions.
2Measurement precision
If multiple PTRS antenna ports are configured for multiple TRPs, then phase noise estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the SSB serve multiple functions: it acts as both a synchronization signal and a reference for PTRS antenna port association. This multi-functionality eliminates the need for separate reference signals for each TRP, allowing multiple PTRS antenna ports to be configured without proportionally increasing system complexity. The same SSB resource is reused across multiple PTRS port associations.
3Ease of operation
If PTRS antenna ports are associated with DMRS antenna ports in CDM groups, then ease of operation is maintained, but time-frequency transmission resource clarity deteriorates
Solution Approach 1:
The patent introduces SSB as an intermediary between PTRS antenna ports and the physical layer resources. Instead of directly associating PTRS with DMRS in CDM groups, the SSB serves as a mediator that provides explicit time-frequency resource information. This intermediary role maintains configuration simplicity while resolving the ambiguity in time-frequency transmission resources for multiple PTRS ports.
Data Source
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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.