PT-RS Power Boosting for 5G Uplink Phase Tracking
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently determining the number of Phase Tracking Reference Signal (PT-RS) antenna ports and optimizing PT-RS power boosting, especially in scenarios with multiple transmission/reception points and varying transmission configurations, which can lead to suboptimal performance and increased interference.
Innovation Solution
The proposed solution involves techniques for determining PT-RS antenna ports based on Transmission Configuration Indication (TCI) and precoder configurations, as well as power boosting methods that adjust energy per resource element ratios to optimize PT-RS power distribution across different channels, ensuring efficient phase tracking and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PT-RS power boosting is increased to improve phase tracking accuracy, then communication reliability is improved, but interference to other signals increases
Solution Approach 1:
The patent applies local quality by differentiating power boosting treatment across different PT-RS antenna ports and resource elements. Specifically, the network device determines different power boosting values for different PT-RS antenna ports based on their respective channel conditions, and adjusts power selectively on specific resource elements where phase tracking is most critical, rather than uniformly boosting all PT-RS signals.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the power boosting value based on multiple variables including the number of PT-RS antenna ports, channel quality indicators, and resource element positions. The network device calculates optimal power boosting parameters by evaluating channel state information and adapting the boosting level to match current communication conditions, thereby optimizing the balance between reliability and interference.
2Measurement precision
If the number of PT-RS antenna ports is increased to improve phase tracking performance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the number of PT-RS antenna ports configurable and adaptable rather than fixed. The network device can dynamically adjust the number of active PT-RS antenna ports based on channel conditions, user equipment capability, and traffic requirements. This allows the system to scale phase tracking resources up or down as needed, optimizing precision while managing complexity.
Solution Approach 2:
The patent implements segmentation by dividing the phase tracking function across multiple antenna ports that can be independently configured and activated. Instead of using a single complex reference signal, the system segments the PT-RS into multiple ports with different spatial characteristics, allowing selective activation based on channel conditions and reducing overall system complexity while maintaining or improving measurement precision.
3Reliability
If PT-RS power is boosted on all resource elements to ensure coverage, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by selectively applying power boosting only to specific resource elements where it is most needed for phase tracking, rather than uniformly boosting all resource elements. The network device identifies critical resource elements based on channel conditions and applies enhanced power only to those locations, ensuring adequate coverage while minimizing unnecessary energy consumption on resource elements with sufficient signal strength.
Data Source
AI summary
User equipment (UE) can include processing circuitry configured to decode radio resource control (RRC) signaling from a base station, the RRC signaling indicating a transmission coding scheme for a physical uplink shared channel (PUSCH) transmission. PUSCH-to-phase tracking reference signal (PT-RS) energy per resource element (EPRE) ratio is determined using the RRC signaling. A PT-RS power boosting factor is determined based on the transmission coding scheme and the PUSCH-to-PT-RS EPRE ratio. The PT-RS is encoded for transmission using a plurality of PT-RS symbols, the transmission using increased transmission power corresponding to the PT-RS power boosting factor. The RRC signaling further includes a flag enabling the PT-RS transmission. The PUSCH-to-PT-RS EPRE ratio is 00 or 01, and the transmission coding scheme is a codebook-based uplink transmission or non-codebook-based uplink transmission.