Multi-Layer PTRS Signaling for Lower PAPR Phase Tracking
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource utilization and increased peak-to-average-power ratio (PAPR) due to unequal transmit power distribution across multiple transmission layers, leading to increased system latency and reduced reliability.
Innovation Solution
The system maintains equal average energy across transmission layers by transmitting data signaling at the same power as phase tracking reference signal (PTRS) transmissions, allowing phase noise estimation and correction across layers using a single modulation and coding scheme or lower MCS when phase noise differs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTRS transmissions are given higher transmit power than data signaling to improve phase noise estimation accuracy, then phase noise correction reliability is improved, but peak-to-average-power ratio increases and resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating power allocation based on transmission layer and signal type. Specifically, data signaling and PTRS on the same transmission layer are transmitted at equal power levels, while PTRS on different transmission layers are transmitted at higher power levels. This localized power differentiation optimizes phase noise estimation where needed without unnecessarily increasing overall PAPR.
Solution Approach 2:
The patent changes the power allocation parameter dynamically based on transmission layer configuration. When multiple transmission layers are used, the system adjusts PTRS power relative to data signaling power according to the specific layer combination, enabling flexible optimization of phase noise correction while controlling PAPR.
2Reliability
If PTRS transmissions use higher transmit power to ensure reliable phase tracking, then phase noise correction reliability is improved, but resource utilization efficiency deteriorates due to unequal power distribution
Solution Approach 1:
The patent implements local quality by applying differentiated power allocation only where phase noise correction is needed. Data signaling and PTRS on the same layer use equal power, while PTRS on other layers use higher power. This targeted approach ensures reliability for phase tracking without wasting resources on unnecessary power boosts elsewhere in the system.
Solution Approach 2:
The patent introduces dynamic power allocation that adapts to the transmission configuration. The system adjusts PTRS power levels based on whether single-layer or multi-layer transmission is being used, and whether phase noise correction is required for specific layers, enabling flexible resource utilization while maintaining reliability.
3Productivity
If equal power is allocated to data signaling and PTRS across all layers, then resource utilization improves and PAPR is reduced, but phase noise estimation accuracy may deteriorate for layers without dedicated PTRS
Solution Approach 1:
The patent applies universality by enabling PTRS transmitted on one transmission layer to serve phase noise estimation purposes for multiple layers. When PTRS is transmitted on a reference layer, its phase noise estimate can be applied to other layers that share the same phase noise characteristics, eliminating the need for separate high-power PTRS transmissions on each layer while maintaining estimation accuracy.
Solution Approach 2:
The patent changes the power allocation parameter based on the specific transmission layer configuration and phase noise characteristics. For layers where phase noise is correlated with the reference layer, equal power allocation suffices. For layers with independent phase noise, the system adjusts PTRS power levels accordingly, optimizing both resource utilization and estimation accuracy.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for transmitting data signaling via a first set of subcarriers (e.g., data subcarriers) at a same transmit power as PTRS transmissions via a second set of subcarriers (e.g., PTRS subcarriers) via a first transmission layer. Additionally, the described techniques provide for transmitting data signaling via the first set of subcarriers and the second set of subcarriers via a second transmission layer. That is, a wireless device may transmit data signaling via the second transmission layer at subcarriers used for PTRS transmissions via the first transmission layer while maintaining an average energy across the first transmission layer and the second transmission layer. In some examples, a receiving device may estimate the phase noise error for each transmission layer using one or more PTRS transmissions or using signaling from each transmission layer.