PTRS Transmission Using Extended FD-OCC for MIMO Phase Tracking
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Solution Overview
Problem
In high-frequency communications, the increase in the number of DMRS ports and data streams in MIMO transmission leads to challenges in phase noise estimation due to the lack of a corresponding solution for transmitting phase tracking reference signals (PTRS), affecting accuracy.
Innovation Solution
A method and apparatus for transmitting PTRS with enhanced DMRS ports using a frequency domain orthogonal cover code (FD-OCC) sequence length greater than 2, and adjusting frequency and energy per resource element (EPRE) ratios to support more than 6 data streams in PDSCH and more than 4 in PUSCH, ensuring accurate phase noise estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of DMRS ports and data streams is increased to improve network throughput, then productivity is improved, but the accuracy of phase noise estimation deteriorates due to lack of corresponding PTRS transmission solutions
Solution Approach 1:
The patent changes the FD-OCC sequence length parameter from the conventional value of 2 to greater than 2 (e.g., 4), which enables the PTRS to support more DMRS ports and data streams while maintaining phase noise estimation accuracy. This parameter change resolves the contradiction by allowing the system to scale up productivity without sacrificing measurement precision.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms for PTRS transmission parameters including frequency domain resource offsets and EPRE ratios. These dynamic parameters allow the system to adapt PTRS configuration to different numbers of data streams and DMRS ports, ensuring accurate phase noise estimation across varying throughput requirements.
2Quantity of substance
If the FD-OCC sequence length is increased to support more DMRS ports, then the number of supported data streams is improved, but the complexity of the transmission system increases
Solution Approach 1:
The patent segments the frequency domain resources by introducing longer FD-OCC sequences that cover more subcarriers. This segmentation approach allows multiple DMRS ports to be multiplexed in the frequency domain without increasing time domain overhead, thereby supporting more data streams with controlled system complexity.
Solution Approach 2:
The patent extends the FD-OCC sequence length to exploit additional frequency domain dimensions for multiplexing. By using FD-OCC sequences with length greater than 2, the system can support more DMRS ports through frequency domain spreading, adding capacity without proportionally increasing overall system complexity.
3Measurement precision
If the frequency domain resource offset and EPRE ratio are adjusted to maintain PTRS performance with increased DMRS ports, then measurement precision is preserved, but the calculation complexity increases
Solution Approach 1:
The patent establishes specific parameter relationships and formulas for calculating frequency domain resource offsets and EPRE ratios based on the number of data streams and DMRS ports. These parameter changes maintain PTRS performance while providing systematic calculation methods that manage complexity through standardized formulas rather than ad-hoc computations.
Data Source
AI summary
This application discloses a phase tracking reference signal transmission method and apparatus, a terminal, and a network-side device. The phase tracking reference signal transmission method of the embodiments of this application includes: determining, by a terminal, a transmission parameter for a PTRS; and sending, by the terminal, the PTRS based on the transmission parameter, or receiving, by the terminal, the PTRS based on the transmission parameter.