PTRS Power Boost for SDM Phase Tracking
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the power ratio between the Physical Uplink Shared Channel (PUSCH) and the Phase Tracking Reference Signal (PTRS) in Spatial Division Multiplexing (SDM) schemes, particularly due to differences in coherency assumptions and power configurations across multiple antenna panels.
Innovation Solution
A method for determining a PTRS power boost value relative to each layer of PUSCH per resource element (RE) for a PTRS port associated with a sounding reference signal (SRS) resource set, allowing for dynamic adjustment of PTRS transmission power based on the specific configuration and coherency assumptions of the SDM scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed PTRS power configuration is used across all antenna panels, then device complexity is reduced, but measurement precision of phase noise and frequency offset deteriorates due to different coherency assumptions in SDM schemes
Solution Approach 1:
The patent segments the PTRS power configuration by antenna panel, where each panel can have its own PTRS power configuration independent of other panels. This allows the system to handle different coherency assumptions for different panels separately, improving measurement precision without requiring a single complex unified configuration across all panels.
Solution Approach 2:
The patent introduces dynamic PTRS power adjustment based on coherency assumptions. The PTRS power configuration can be dynamically changed according to whether the antenna panel operates under coherent or non-coherent assumptions, allowing the system to adapt to different operational conditions and maintain optimal measurement precision.
2Measurement precision
If PTRS power is increased to improve phase tracking accuracy, then measurement precision improves, but power consumption increases
Solution Approach 1:
The patent changes the PTRS power parameter dynamically based on coherency assumptions and panel configurations. By adjusting the PTRS power parameter according to specific operational conditions rather than using a fixed high power level, the system achieves adequate phase tracking accuracy while minimizing unnecessary power consumption.
Solution Approach 2:
The patent applies different PTRS power levels to different antenna panels based on their specific coherency assumptions and channel conditions. This local optimization allows each panel to use the minimum necessary power to achieve required tracking accuracy, rather than all panels using a uniformly high power level.
3Measurement precision
If separate PTRS power configurations are used for each antenna panel, then measurement precision improves through tailored optimization, but device complexity increases due to multiple configuration parameters
Solution Approach 1:
The patent segments the configuration management by associating each PTRS port with a specific antenna panel. This segmentation allows independent configuration of each panel while maintaining clear organizational structure, reducing the complexity of managing multiple configurations compared to a fully unified approach.
Solution Approach 2:
The patent establishes preliminary associations between PTRS ports and antenna panels before operation. By pre-configuring which PTRS ports correspond to which panels and their coherency assumptions, the system simplifies runtime configuration management while still allowing panel-specific optimization for improved measurement precision.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a value for a phase tracking reference signal (PTRS) power boost for a PTRS port, wherein the PTRS port is associated with a sounding reference signal (SRS) resource set, wherein the value for the PTRS power boost is relative to each layer of physical uplink shared channel (PUSCH) per resource element (RE). The UE may transmit a PTRS associated with the PTRS port, and wherein a transmission power of the PTRS is based at least in part on the value for the PTRS power boost. Numerous other aspects are described.