PTRS Design for Multi-TRP Wireless Communication
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Solution Overview
Problem
The challenge in wireless communication systems is designing Phase-Tracking Reference Signals (PTRS) for transmissions involving multiple Transmit-Receive Points (TRPs), antenna panels, or beams, which is essential for maintaining communication quality, especially in high-frequency bands where phase noise significantly impacts channel estimation.
Innovation Solution
A method is proposed where a first node in a wireless communication system receives a signaling to determine two orthogonal time-frequency resource block sets. The node then transmits a first signal, a first reference signal, and a first demodulation reference signal in the first time-frequency resource block set, and a second signal, a second reference signal, and a second demodulation reference signal in the second time-frequency resource block set. This approach allows for the association of a most appropriate DMRS port number with each PTRS port number, enabling efficient data transmission for different TRPs or antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified PTRS design is used for multiple TRPs or antenna panels, then device complexity is reduced, but channel estimation precision deteriorates due to phase noise in high-frequency bands
Solution Approach 1:
The patent divides the PTRS design into separate configurations for different TRPs or antenna panels. Each TRP or antenna panel has its own PTRS with dedicated time-frequency resources, allowing independent phase tracking for each transmitter while maintaining a unified overall structure. This segmentation enables precise channel estimation for each TRP without requiring separate complex hardware for each configuration.
Solution Approach 2:
The patent creates a universal PTRS framework that can support multiple TRPs or antenna panels through a single signaling mechanism. The DCI signaling can indicate different PTRS-DMRS association patterns that work across various transmission scenarios (single TRP, multiple TRPs, different antenna panels), making the system adaptable without requiring separate hardware designs for each case.
2Measurement precision
If separate DCI signaling is used for each TRP or antenna panel, then channel estimation precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the control signaling for multiple TRPs or antenna panels into a single DCI message. This unified DCI contains multiple fields that can indicate different PTRS-DMRS association patterns for different TRPs, allowing the system to manage multiple transmission points with one signaling mechanism rather than requiring separate DCI signaling for each TRP.
Solution Approach 2:
The patent introduces dynamic PTRS-DMRS association patterns that can be configured through DCI signaling. The association between PTRS and DMRS can be dynamically adjusted based on the transmission scenario (single TRP, multiple TRPs, different antenna panels), allowing the system to adapt its configuration without requiring separate hardware designs for each case.
3Reliability
If PTRS is used for phase tracking in high-frequency bands, then communication quality is improved, but the impact of phase noise increases channel estimation errors
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures the PTRS to obtain phase information, then uses this feedback to compensate for phase noise in the channel estimation process. The measured PTRS values are fed back to correct the channel estimates for the data signals, continuously improving communication quality by adapting to phase noise conditions.
Solution Approach 2:
The patent introduces DMRS as an intermediary reference signal that bridges the PTRS phase tracking function and the data signal demodulation function. The DMRS serves as a mediator that incorporates the phase information from PTRS while providing direct channel estimation for the data signals, effectively separating the phase noise compensation function from the channel estimation function to improve overall precision.
Data Source
AI summary
The present disclosure provides a method and device in a node for wireless communication. A first node receives a first signaling; transmits a first signal, a first reference signal and a first demodulation reference signal in the first time-frequency resource block set; and transmits a second signal, a second reference signal and a second demodulation reference signal in the second time-frequency resource block set. A third antenna port is an antenna port transmitting the first reference signal, a fourth antenna port is an antenna port transmitting the second reference signal, and both a port number of the third antenna port and a port number of the fourth antenna port are a target antenna port number; a first antenna port is an antenna port transmitting the first demodulation reference signal, and the third antenna port is associated with the first antenna port.