PTRS-DMRS Port Mapping Indication for 5G Phase Noise Estimation
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Solution Overview
Problem
In 5G mobile communication systems, high-frequency transmission is limited by phase noise, especially with higher-order modulation schemes, and there is a need to accurately estimate phase noise for effective transmission, but current methods lack a clear indication of the DMRS port associated with the Phase Tracking Reference Signal (PTRS) in uplink transmissions using CP-OFDM waveform, hindering phase noise estimation.
Innovation Solution
A method for transmitting indication information to indicate the DMRS port associated with the PTRS port in uplink transmissions using CP-OFDM waveform, allowing terminals to accurately acquire and transmit PTRS data on the correct DMRS port, thereby improving phase noise estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PTRS port is shared among multiple QCL DMRS ports to improve resource utilization, then the quantity of PTRS ports is reduced, but it becomes difficult to determine which DMRS port the PTRS should be mapped to, reducing phase noise estimation accuracy
Solution Approach 1:
The patent introduces indication information as an intermediary mechanism that explicitly specifies the mapping relationship between PTRS ports and DMRS ports. This mediator resolves the ambiguity created by port sharing, allowing the receiver to accurately determine which DMRS port corresponds to the PTRS port without requiring additional PTRS ports.
2Productivity
If higher-order modulation schemes are used to improve transmission rate, then the transmission efficiency is increased, but the system becomes more susceptible to phase noise, worsening transmission reliability
Solution Approach 1:
The patent implements a feedback mechanism where the receiver estimates phase noise using the PTRS and feeds back this information to enable phase compensation at the transmitter or receiver. This closed-loop approach allows higher-order modulation schemes to be used while maintaining transmission reliability through active phase noise correction.
3Measurement precision
If PTRS is mapped to DMRS port with best channel condition to improve phase noise estimation accuracy, then more channel information is needed, but this increases the complexity of port mapping determination
Solution Approach 1:
The patent applies preliminary action by pre-determining and indicating the PTRS-to-DMRS port mapping relationship before actual data transmission. The indication information is provided in advance through downlink control information or higher-layer signaling, allowing the receiver to prepare the correct port mapping without complex real-time determination, thus reducing system complexity while maintaining estimation accuracy.
Data Source
AI summary
Embodiments of the present disclosure provide a PTRS association indication method, a PTRS transmission method, a network device and a terminal. The PTRS association indication method includes: transmitting indication information to a terminal, the indication information being used to indicate information of a DMRS port to the terminal, the DMRS port being associated with a PTRS port in uplink transmission using a CP-OFDM waveform.