PTRS Arrangement for Phase Noise Correction in 5G NR
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Solution Overview
Problem
In the 5G New Radio (NR) wireless communication system, there is a need to appropriately arrange the Phase Tracking Reference Signal (PTRS) to ensure accurate phase noise correction while considering overlap with other reference signals and overall overhead, which is challenging due to puncturing that affects insertion density and quality.
Innovation Solution
A base station apparatus that arranges a reference signal for phase correction at a predetermined interval in a radio frame, allowing for flexible mapping of the PTRS to maintain or adjust its insertion interval, even when punctured, to ensure accurate phase noise correction without increasing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the PTRS is arranged at a front position in a time domain within a slot to reduce processing time, then processing time is reduced, but the PTRS may overlap with other reference signals causing puncturing that reduces phase noise correction accuracy
Solution Approach 1:
The patent applies dynamics by making the PTRS arrangement flexible and adaptive. The setting unit dynamically determines PTRS positions based on DMRS arrangement information and puncturing patterns, allowing the system to adjust PTRS placement in real-time to avoid overlaps while maintaining front-loaded positioning benefits. This dynamic adaptation resolves the contradiction between reduced processing time and maintained phase noise correction accuracy.
Solution Approach 2:
The patent applies preliminary action by determining the PTRS arrangement in advance based on predicted DMRS positions and puncturing patterns. The base station configures PTRS resources before actual transmission, using high-layer signaling to inform the user equipment of the arrangement. This preliminary configuration prevents overlaps and ensures accurate phase noise correction from the start, while maintaining the processing time benefits of front-loaded positioning.
2Measurement precision
If the PTRS insertion density is increased to improve phase noise correction accuracy, then phase noise correction accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies parameter changes by flexibly adjusting the PTRS insertion interval based on channel conditions, phase noise characteristics, and traffic requirements. Rather than using a fixed high insertion density, the system dynamically modifies the insertion interval parameter to achieve the minimum necessary density for acceptable phase noise correction. This resolves the contradiction by adapting the insertion density parameter to match actual needs, avoiding excessive signaling overhead while maintaining sufficient correction accuracy.
3Measurement precision
If the PTRS arrangement is made flexible to adapt to puncturing patterns, then phase noise correction accuracy is maintained, but the device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the user equipment to autonomously determine PTRS positions based on received DMRS arrangement information and puncturing patterns. The UE uses the provided high-layer signaling parameters to self-configure its PTRS reception without requiring complex base station processing or additional coordination. This self-service approach maintains phase noise correction accuracy through flexible adaptation while minimizing device complexity by distributing the arrangement intelligence to the UE side.
Data Source
AI summary
A base station apparatus performs communication with a user apparatus and includes a setting unit that arranges a reference signal used for phase correction in a radio frame at a predetermined interval and a transmitting unit that transmits the radio frame to the user apparatus, and, in a case in which the reference signal used for the phase correction is punctured in the radio frame, the reference signal used for the phase correction is arranged in a resource of the radio frame in which the reference signal used for the phase correction is arrangeable.