Carrier Aggregation Phase Noise Compensation via PTRS Grouping
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Solution Overview
Problem
In wireless communication devices supporting carrier aggregation, phase noise occurs due to frequency conversion, especially at higher frequencies, leading to signal jitter, and existing methods redundantly transmit phase tracking reference signals (PTRS) for each component carrier (CC), inefficiently managing wireless resources.
Innovation Solution
A method where a user terminal determines the phase noise characteristic of multiple CCs and requests PTRS transmission only from CCs with similar noise characteristics, allowing for cooperative phase noise compensation using a single PTRS, thereby reducing redundant PTRS transmission and optimizing wireless resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTRS is transmitted for each component carrier (CC) individually, then phase noise compensation reliability is improved, but wireless resource usage deteriorates due to redundant transmission
Solution Approach 1:
The patent merges the PTRS transmission function across multiple CCs by grouping them into a PTRS CC group. When CCs share similar phase noise characteristics, a single PTRS transmitted on one CC can be used for phase noise compensation across the entire group, eliminating redundant PTRS transmissions on other CCs while maintaining compensation reliability.
Solution Approach 2:
The patent enables a single PTRS to serve multiple functions by allowing it to compensate for phase noise across multiple CCs simultaneously. This multi-functionality is achieved when the user terminal determines that CCs in the group have similar phase noise characteristics, making one PTRS universally applicable to all grouped CCs.
2Measurement precision
If PTRS is transmitted on every CC, then measurement precision for phase noise is improved, but device complexity increases due to multiple transmission channels
Solution Approach 1:
The patent segments CCs into groups based on their phase noise characteristics, creating a PTRS CC group. This segmentation allows the system to apply different PTRS transmission strategies to different groups, reducing overall complexity while maintaining measurement precision within each group through cooperative phase noise compensation.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the user terminal to determine whether CCs have similar phase noise characteristics and adjust PTRS transmission accordingly. The system dynamically decides whether to use individual CC-based PTRS transmission or grouped PTRS transmission based on the determined similarity, optimizing the balance between measurement precision and system complexity.
3Manufacturing precision
If multiple PTRS are transmitted across different CCs, then phase noise compensation accuracy is improved, but transmission time increases
Solution Approach 1:
The patent performs preliminary determination of phase noise characteristic similarity among CCs before initiating PTRS transmission. By pre-grouping CCs with similar characteristics into a PTRS CC group, the system avoids unnecessary PTRS transmissions and reduces overall transmission time while maintaining compensation accuracy through cooperative processing of the grouped CCs.
Data Source
AI summary
A user terminal supporting carrier aggregation (CA) and an operating method thereof are provided. The operating method includes receiving indication information regarding a phase tracking reference signal (PTRS) component carrier (CC) group from a base station; determining whether a phase noise characteristic of the user terminal is the same with respect to CCs included in the PTRS CC group, based at least in part on the indication information; requesting the base station to transmit at least one PTRS using at least one CC included in the PTRS CC group; and receiving the at least one PTRS from the base station using the at least one CC.