Uplink Power Control for Multi-Beam NR Systems
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Solution Overview
Problem
New Radio (NR) systems face challenges in uplink power control due to the use of multiple transmit/receive points with shared cell IDs, which complicates power management for grant-free and multi-beam communications, requiring improved power control schemes to ensure efficient and accurate transmission.
Innovation Solution
The method involves determining and applying distinct transmission powers for different physical uplink shared channels on various spatial resources, such as transmission beams or antenna ports, using specific power parameters derived from cell-specific and user equipment (UE)-specific settings, including pathloss and closed-loop factors, to optimize power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transmit/receive points with shared cell IDs are used in NR systems, then the coverage area and communication capabilities are improved, but the power control complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the uplink power control by introducing separate power parameters for different spatial resources ( beams, layers, antenna ports). Each spatial resource has its own power control parameters including pathloss reference signals and closed-loop factors, allowing independent power adjustment for each spatial dimension while maintaining overall system coordination
Solution Approach 2:
The patent applies local quality by configuring power parameters specifically for each spatial resource. Different beams, layers, or antenna ports can have different pathloss reference signals, power offsets, and closed-loop factors, enabling localized power optimization tailored to specific spatial characteristics and interference conditions
2Productivity
If grant-free transmissions are supported in NR systems, then the transmission efficiency and latency are improved, but the uplink power control accuracy and interference coordination become more challenging
Solution Approach 1:
The patent applies preliminary action by pre-configuring power parameters for grant-free PUSCH transmissions through RRC signaling. Power control parameters including pathloss reference signals, power offsets, and closed-loop factors are established in advance, enabling UEs to autonomously determine transmission power without real-time grants while maintaining power control accuracy
Solution Approach 2:
The patent incorporates feedback mechanisms through closed-loop power control factors that can be adjusted based on uplink reception quality. Even in grant-free mode, the system can provide feedback via downlink control information or RRC reconfiguration to refine power parameters, ensuring continuous power control accuracy improvement
3Productivity
If multi-beam communications are implemented, then the system capacity and coverage are improved, but the interference management and power allocation complexity increase
Solution Approach 1:
The patent segments power control into beam-specific components by associating different pathloss reference signals and power parameters with different beams. This allows independent power adjustment for each beam, enabling precise interference management while maintaining high system capacity through multi-beam operations
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting beam-specific power parameters including pathloss compensation factors, power offsets, and closed-loop factors. These parameter adjustments enable adaptive interference management that responds to changing channel conditions and interference levels across different beams
Data Source
AI summary
Methods are disclosed that enable a user equipment (UE) to receive cell specific, UE specific and, in some embodiments, Physical Uplink Shared Channel (PUSCH) specific parameters from a network side component, such as a transmit/receive point, and use that information to set at least one PUSCH transmit power when transmitting to the network side.