Uplink PTRS Port Association for Multi-Panel Non-Codebook SDM
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Solution Overview
Problem
In the context of uplink enhancement in Release 18 (R18) for multi-panel and/or multiple Transmission Reception Point (multi-TRP) communication systems, the reliable transmission of Phase Tracking Reference Signals (PTRS) is crucial for accurate Common Phase Error estimation, particularly in non-codebook-based Space Division Multiplexing (SDM) scenarios, to support higher throughput and more reliable transmission performance.
Innovation Solution
A method and apparatus for determining uplink PTRS transmission parameters, including the number of actual transmission ports and DMRS ports associated with each PTRS port, are implemented by both terminal and network devices to ensure accurate phase tracking and reliable transmission, especially in non-codebook-based SDM scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink STxMP is configured for non-codebook-based SDM transmission, then higher throughput and transmission reliability are improved, but PTRS transmission reliability deteriorates due to unclear port association relationships
Solution Approach 1:
The patent segments the PTRS transmission by establishing one-to-one correspondence between PTRS ports and DMRS ports, and further divides the DMRS ports into first and second groups based on their association with different panels. This segmentation allows independent phase tracking for each panel while maintaining overall transmission reliability in multi-TRP scenarios.
Solution Approach 2:
The patent introduces DMRS ports as intermediary elements to establish the association relationship with PTRS ports. The DMRS ports serve as mediators that link the physical downlink shared channel ports to the physical uplink shared channel ports, enabling reliable phase tracking through the intermediary association mechanism.
2Measurement precision
If multiple DMRS ports are associated with PTRS ports in multi-TRP scenarios, then phase tracking accuracy is improved, but system complexity increases due to unclear association relationships
Solution Approach 1:
The patent segments the complex port association relationships into clear one-to-one correspondences between PTRS ports and DMRS ports, and further divides DMRS ports into first and second groups based on panel associations. This segmentation simplifies the association relationships while maintaining phase tracking accuracy across multiple TRPs.
Solution Approach 2:
The patent applies local quality by establishing different association relationships for different panels. First DMRS ports are associated with first PTRS ports for first panels, while second DMRS ports are associated with second PTRS ports for second panels. This localized association strategy maintains phase tracking accuracy for each panel while managing overall system complexity.
Data Source
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AI summary
The present disclosure provides a transmission method for uplink phase tracking reference signal (PTRS) and a communication apparatus, applicable to mobile communication technology. The method comprises: under the configuration of uplink simultaneously transmission across multiple panels (STxMP), when a PUSCH is scheduled for non-codebook-based SDM transmission, determining an uplink PTRS transmission parameter on the basis of received configuration information, wherein the PTRS transmission parameter comprises the number of actual sending ports of the PTRS and a DMRS port actually associated with each PTRS port, and different PTRS ports are associated with different DMRS ports; and on the basis of an uplink PTRS transmission parameter, sending a PTRS to a network device, thereby achieving reliable transmission of the PTRS.