PT-RS Pattern Determination for 5G High-Frequency Phase Noise
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in determining phase tracking reference signal (PT-RS) patterns for carrier frequencies above 52.6 GHz, where low power amplifier efficiency and large phase noise issues arise, necessitating efficient waveform choices and phase noise compensation mechanisms.
Innovation Solution
The determination of PT-RS patterns for initial and retransmission of transport blocks in physical downlink and uplink shared channels using modulation and coding schemes, with options for separate or common PT-RS patterns based on modulation orders and number of physical resource blocks, to address phase noise and efficiency concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier frequency is increased above 52.6 GHz to achieve higher data transmission rates, then productivity is improved, but phase noise increases and amplifier efficiency deteriorates
Solution Approach 1:
Phase tracking reference signals (PT-RS) are introduced as intermediary reference signals inserted into the data transmission at specific time-frequency positions. These PT-RS serve as mediators between the transmitted data and the receiver, enabling phase noise measurement and compensation without interfering with the primary data transmission function
Solution Approach 2:
The patent dynamically adjusts PT-RS parameters including insertion position, density, and pattern based on modulation and coding scheme (MCS) values, carrier frequency, and channel conditions. This parameter adaptation allows the system to optimize phase tracking performance across different operating conditions while maintaining productivity
2Measurement precision
If PT-RS pattern density is increased to improve phase tracking precision, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The PT-RS pattern is made dynamic rather than static, with insertion positions and densities adapting based on MCS thresholds, carrier frequency ranges, and retransmission status. This dynamic configuration allows the system to use higher PT-RS density only when phase tracking difficulty increases, optimizing the balance between measurement precision and energy consumption
Solution Approach 2:
Different PT-RS patterns are applied to different transmission scenarios (initial transmission vs. retransmission, different MCS ranges, different carrier frequencies). This local optimization ensures that high measurement precision is achieved only where necessary, rather than uniformly across all transmissions
3Reliability
If separate PT-RS patterns are used for initial transmission and retransmission to improve reliability, then reliability is improved, but device complexity increases
Solution Approach 1:
The PT-RS configuration is segmented into different patterns for initial transmission and retransmission scenarios. Each segment (initial/retransmission) has optimized PT-RS parameters suited to its specific reliability requirements, with retransmissions potentially using higher density patterns to ensure successful decoding
Data Source
AI summary
Various embodiments herein are directed to determining phase tracking reference signal (PT-RS) patterns, including systems operating above a carrier frequency of 52.6 GHz and an apparatus comprising: memory to store phase tracking reference signal (PT-RS) information for initial transmission and retransmission of a transport block (TB) within a physical uplink shared channel (PUSCH); and processing circuitry, coupled with the memory, to: retrieve the PT-RS information from the memory; and encode a PUSCH containing the TB for initial transmission or retransmission based on the PT-RS information.