Adaptive HARQ PTRS Configuration for Millimeter Wave Phase Noise
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Solution Overview
Problem
Current wireless communication systems, particularly in millimeter wave frequencies, face challenges with phase noise and phase distortion due to insufficient flexibility in adjusting Phase Tracking Reference Signal (PTRS) configurations between re-transmissions, leading to inefficiencies in HARQ processes.
Innovation Solution
Implementing adaptive HARQ communication techniques that allow for changing the PTRS configuration between re-transmissions using a look-up table to identify suitable RS patterns based on communication metrics, such as phase distortion, to enhance re-transmission success in millimeter wave frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed PTRS configuration is used in HARQ re-transmissions, then system complexity is reduced, but phase noise compensation effectiveness deteriorates in millimeter wave frequencies
Solution Approach 1:
The patent implements dynamic PTRS configuration by allowing the PTRS pattern (density, time-frequency position) to change between initial transmission and re-transmissions based on channel conditions. The receiving device determines whether to apply a first or second PTRS pattern for re-transmissions, enabling adaptive adjustment to compensate for phase noise variations in millimeter wave frequencies without requiring complex reconfiguration procedures.
2Reliability
If adaptive PTRS configuration is implemented between re-transmissions, then phase noise compensation effectiveness is improved, but signaling overhead and procedure complexity increase
Solution Approach 1:
The patent employs feedback mechanisms where the receiving device sends HARQ feedback indicating whether phase noise compensation was successful. Based on this feedback and channel conditions, the transmitting device adjusts the PTRS pattern for subsequent re-transmissions. This closed-loop approach enables adaptive optimization while keeping the control signaling efficient and the procedure manageable.
Solution Approach 2:
The patent changes physical parameters of the PTRS configuration, specifically the pattern density and time-frequency positioning, between initial transmission and re-transmissions. By adjusting these parameters adaptively based on detected phase distortion levels, the system improves compensation effectiveness without requiring complete reconfiguration of the HARQ procedure, thus limiting the increase in complexity.
3Reliability
If PTRS pattern is changed based on phase distortion metrics, then communication reliability in high-frequency bands is improved, but measurement and detection complexity increases
Solution Approach 1:
The patent performs preliminary measurement of phase distortion metrics during the initial transmission phase using the first PTRS pattern. These measurements are stored and used to determine the appropriate PTRS pattern for subsequent re-transmissions. By performing measurements in advance and using them to guide pattern selection, the system reduces the need for complex real-time measurement and decision-making during time-critical re-transmission processes.
Data Source
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AI summary
Certain aspects of the present disclosure provide systems and methods for adaptive hybrid automatic repeat request (HARQ) communication for changing a reference signal (RS) configuration between one or more re-transmissions. In some embodiments, the method includes detecting a failure to decode a first communication from a network entity. The method may also include determining one or more communication metrics associated with the first communication. The method may also include selecting a physical parameter configured to identify the one or more communication metrics associated with the first communication, and transmitting a second communication in accordance with the selected physical parameter to the network entity in response to detecting the failure to decode the first communication.