PTRS Transmit Power Determination for 5G Phase Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G communication systems face challenges in determining the optimal transmit power for phase tracking reference signals (PTRS) due to varying quantities of DMRS and PTRS ports, leading to inefficient energy use and reduced measurement accuracy, especially in high-frequency bands where phase noise and carrier frequency offset are significant.
Innovation Solution
A method to determine the transmit power of PTRS by calculating or referencing tables to ensure the PTRS power is proportional to the data channel or DMRS power, allowing flexible adaptation to different port configurations and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmit power of PTRS is increased to improve measurement accuracy in high-frequency bands, then PTRS measurement accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts the transmit power of PTRS based on multiple parameters including the quantity of DMRS ports, quantity of PTRS ports, port multiplexing manner, and channel conditions. By changing the power parameter adaptively rather than using a fixed high power level, the system achieves adequate measurement accuracy while minimizing unnecessary energy consumption.
2Reliability
If the transmit power of PTRS is increased to ensure reliable phase tracking in high-frequency bands, then phase tracking reliability is improved, but overall system energy efficiency deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment for PTRS transmission, where the transmit power is adapted in real-time based on current system conditions including the number of ports, multiplexing configuration, and channel quality. This dynamic approach ensures phase tracking reliability is maintained only when necessary, rather than continuously operating at high power levels, thereby improving overall energy efficiency.
3Adaptability or versatility
If the transmit power of PTRS is set to a fixed high level to accommodate all port configurations, then adaptability to different configurations is improved, but energy waste increases
Solution Approach 1:
Instead of using a fixed high power level for all configurations, the patent changes the PTRS transmit power parameter dynamically according to the specific configuration being used. The power level is adjusted based on the quantity of DMRS ports, quantity of PTRS ports, and port multiplexing manner, ensuring adequate power is allocated for each configuration without wasting energy on configurations that require less power.
4Loss of energy
If the transmit power of PTRS is reduced to save energy, then energy efficiency is improved, but PTRS measurement accuracy deteriorates
Solution Approach 1:
The patent avoids reducing PTRS power below necessary levels by implementing parameter-based dynamic adjustment. The transmit power is reduced only when system conditions (such as fewer ports, simpler multiplexing, or better channel conditions) indicate that lower power is sufficient to maintain measurement accuracy. This prevents both energy waste from excessive power and accuracy degradation from insufficient power.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Embodiments of this application provide a transmit power determining method, including: determining, by a first device, a relative power ratio of a phase tracking reference signal PTRS to a data channel or a relative power ratio of a PTRS to a demodulation reference signal DMRS, where the relative power ratio of the PTRS to the data channel is determined by using a first function and a first variable, the relative power ratio of the PTRS to the DMRS is determined by using a second function, the first variable, and a second variable, the first variable includes a quantity of transport layers or a quantity of DMRS ports, and the second variable includes a frequency domain density of the DMRS; determining transmit power of the PTRS based on the relative power ratio of the PTRS to the data channel and transmit power of the data channel or based on the relative power ratio of the PTRS to the DMRS and transmit power of the DMRS; and sending the PTRS to a second device by using the transmit power of the PTRS.