Uplink Power Control Scaling for Non-Coherent UEs
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Solution Overview
Problem
In 5G NR systems, UEs with partial-coherent and non-coherent antenna transmission capabilities face challenges in reaching maximum transmission power during codebook-based uplink transmission, leading to reduced performance and coverage, especially at the cell edge, due to current power allocation mechanisms.
Innovation Solution
An uplink power control method that allows the base station and terminal to communicate and determine an appropriate power control scaling rule, ensuring consistent understanding and optimal power allocation across multiple antenna ports, even for UEs with non-coherent transmission capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station indicates a precoding matrix using TPMI for codebook-based uplink transmission, then the uplink transmission performance should be optimized, but UEs with partial-coherent and non-coherent antenna capabilities cannot reach maximum transmission power due to power allocation mechanisms
Solution Approach 1:
The patent introduces dynamic power control scaling rules that adapt to different UE antenna coherent transmission capabilities. The base station configures different power control parameters (alpha values, offset values) based on whether the UE is full-coherent, partial-coherent, or non-coherent, allowing the power allocation to dynamically adjust to the actual antenna correlation characteristics of each UE
Solution Approach 2:
The patent changes the power control parameters specifically for non-coherent and partial-coherent UEs by introducing a power control scaling factor that modifies the standard power control formula. This allows UEs with limited antenna coherence to achieve maximum transmission power by adjusting the power allocation across antenna ports according to their actual capabilities
2Reliability
If the UE uses multiple antenna ports for transmission to achieve array gain, then the transmission reliability improves, but the power and phase differences between antenna ports prevent optimal precoder performance
Solution Approach 1:
The patent applies partial action by having UEs with partial-coherent capabilities transmit coherently on some antenna ports while allowing non-coherent transmission on others. The power control mechanism selectively allocates power to ports that can achieve coherent transmission, rather than requiring all ports to meet stringent coherence requirements
Solution Approach 2:
The patent applies different power control strategies to different antenna ports based on their individual coherence characteristics. Full-coherent ports receive higher power allocation with stricter control, while non-coherent ports use different scaling factors, allowing each port to operate at its optimal performance level
3Device complexity
If the current power allocation mechanism is used for multi-antenna transmission, then the system complexity remains manageable, but UEs cannot reach maximum transmission power leading to reduced coverage
Solution Approach 1:
The patent modifies the power control parameters (alpha, offset, scaling factors) based on UE capability reporting. When a UE reports partial-coherent or non-coherent capabilities, the base station adjusts the power control parameters accordingly, enabling the UE to reach maximum transmission power without requiring complex hardware changes
Data Source
AI summary
An uplink power control method and device are provided. The method includes: receiving first indication information sent by a base station, wherein the first indication information is used to indicate an uplink power control rule for an uplink signal; determining a transmission power of the uplink signal according to the uplink power control rule indicated by the first indication information.