PTRS Transmission Power Scaling for Interference Control
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Solution Overview
Problem
In future radio communication systems like NR, the transmission of PTRS by base stations leads to increased interference due to amplified transmission power, compromising throughput.
Innovation Solution
A user terminal and radio communication method that determines PTRS transmission power based on a ratio between PDSCH EPRE and PTRS EPRE, using higher layer parameters to ensure the ratio does not exceed a given value, thereby scaling the PTRS power appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power for PTRS is amplified to improve phase tracking accuracy, then phase tracking performance is improved, but interference from transmission antenna increases and throughput is compromised
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the PTRS transmission power based on the ratio between PDSCH EPRE and PTRS EPRE. The system changes the power parameter adaptively, using higher layer parameters to control the power ratio, thereby achieving appropriate PTRS power levels that prevent excessive interference while maintaining phase tracking accuracy.
2Measurement precision
If transmission power for PTRS is increased to improve phase tracking, then phase tracking performance improves, but throughput is compromised due to increased interference
Solution Approach 1:
The system dynamically changes the PTRS transmission power parameter based on the EPRE ratio between PDSCH and PTRS. By using higher layer parameters to control this ratio, the system optimizes power levels to maintain phase tracking performance while preventing throughput degradation from excessive interference.
Solution Approach 2:
The patent implements dynamics by making the PTRS transmission power adaptive rather than fixed. The power level is dynamically adjusted based on real-time conditions including the PDSCH EPRE and higher layer parameters, allowing the system to optimize the balance between phase tracking performance and throughput.
Data Source
AI summary
Transmission power for a PTRS (Phase Tracking Reference Signal) is appropriately determined. A user terminal according to one aspect of the present disclosure includes a receiving section configured to receive a downlink shared channel (PDSCH (Physical Downlink Shared Channel)) and a PTRS (Phase Tracking Reference Signal), and a control section configured to assume that transmission power for the PTRS is scaled based on a ratio between PDSCH EPRE (Energy Per Resource Element) and PTRS EPRE corresponding to a value of a higher layer parameter, in which at least one set of the ratios corresponding to the value of the higher layer parameter includes only a value of the ratio that is equal to or smaller than a given value.