Uplink PT-RS Port Configuration for Phase Noise Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving uplink phase tracking reference signals (PT-RS) due to limitations in managing the number of PT-RS ports and precoding matrices, leading to increased overhead and potential beamforming inaccuracies.
Innovation Solution
A method and apparatus for dynamically determining the actual number of uplink PT-RS ports based on the precoding matrix set for user equipment (UE) and the maximum number of PT-RS ports, allowing for flexible configuration using full-coherent, partial-coherent, or non-coherent precoding matrices, and incorporating sounding reference signal (SRS) resources to optimize PT-RS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of uplink PT-RS ports is increased to improve phase noise estimation accuracy, then measurement precision is improved, but device complexity and overhead increase
Solution Approach 1:
The patent dynamically changes the number of PT-RS ports based on precoding matrix indicators (PMI) and transmission conditions. The UE and base station agree on a maximum number of PT-RS ports, but the actual number is adjusted according to the configured precoding matrix type (full-coherent, partial-coherent, or non-coherent), thereby optimizing phase noise estimation accuracy while controlling overhead and complexity
Solution Approach 2:
The system transitions from a static PT-RS port configuration to a dynamic one where the number of active PT-RS ports is determined based on the precoding matrix configuration. This allows the system to adapt the PT-RS port count to current transmission conditions, improving measurement precision when needed while reducing overhead when fewer ports are sufficient
2Adaptability or versatility
If the maximum number of uplink PT-RS ports is set high to support all precoding scenarios, then adaptability is improved, but overhead increases
Solution Approach 1:
The patent applies partial action by configuring a maximum number of PT-RS ports that is sufficient for the worst-case scenario (non-coherent precoding with multiple antenna ports), but the actual number of PT-RS ports transmitted is reduced when full-coherent or partial-coherent precoding is used. This ensures adaptability to all precoding types while minimizing overhead in practice
Solution Approach 2:
The system changes the effective number of PT-RS ports based on the precoding matrix indicator (PMI) reported by the UE. When full-coherent precoding is detected, fewer PT-RS ports are used compared to non-coherent precoding, thereby maintaining versatility across different precoding scenarios while reducing the actual overhead
3Productivity
If the actual number of uplink PT-RS ports is determined dynamically based on precoding matrix, then productivity is improved, but device complexity increases
Solution Approach 1:
The UE autonomously determines the actual number of PT-RS ports to use based on the precoding matrix configuration received from the base station. The UE compares the configured precoding matrix type (full-coherent, partial-coherent, or non-coherent) with the maximum number of PT-RS ports agreement and self-determines the appropriate port count without requiring additional signaling or complex coordination, thereby improving efficiency while keeping implementation manageable
Data Source
AI summary
According to the present invention, a method of transmitting and receiving an uplink phase tracking reference signal between a user equipment and a base station in a wireless communication and an apparatus supporting the same are disclosed.According to an example applicable to the present invention, a user equipment can transmit an uplink PT-RS to a base station using the actual number of PT-RS ports which is determined based on the maximum uplink phase tracking reference signal (PT-RS) ports received from the base station and a precoding matrix set to the UE.