NR Uplink Power Control for Multi-Beam EIRP Compliance
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Solution Overview
Problem
Existing uplink power control mechanisms in 5G New Radio (NR) systems face challenges in efficiently managing transmission power for multiple beams and multiplexed numerologies, leading to potential interference and non-compliance with EIRP requirements.
Innovation Solution
A wireless transmit/receive unit (WTRU) determines uplink transmission power based on angular separation of beams and adjusts power levels using maximum power parameters, power scaling, and power allocation rules to ensure compliance with EIRP thresholds and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If separate maximum power level parameters are used for each beam when angular separation is large, then each beam can transmit at its optimal power level, but the overall system complexity increases and EIRP compliance becomes more difficult to manage
Solution Approach 1:
The patent applies local quality by differentiating power control parameters based on the angular separation between beams. When beams are separated by more than a first threshold angle, separate maximum power level parameters are applied to each beam, allowing optimal power transmission for each direction. When beams are closer than the threshold, a shared power parameter is used. This localized differentiation resolves the contradiction by enabling power optimization only when spatial separation justifies the added complexity.
2Device complexity
If a shared maximum power level parameter is used for multiple beams with small angular separation, then EIRP compliance is simplified, but transmission power optimization is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically switching between separate and shared maximum power level parameters based on the angular separation threshold. The system monitors the angular relationship between beams and changes the power control parameter from separate to shared when beams fall within the first threshold angle of each other. This dynamic parameter change resolves the contradiction by adapting the power control strategy to the actual spatial conditions, simplifying control when beams are close while allowing optimization when they are separated.
3Object-generated harmful factors
If power scaling is applied to ensure EIRP compliance, then interference is reduced, but transmission reliability may be compromised
Solution Approach 1:
The patent applies dynamics by implementing adaptive power scaling that responds to real-time EIRP measurements and angular separation conditions. Rather than applying fixed power reduction, the system dynamically adjusts power levels based on the actual transmission scenario. When EIRP thresholds are approached, power scaling is applied; when beams are well-separated and EIRP compliance is naturally satisfied, full power transmission is permitted. This dynamic approach resolves the contradiction by reducing interference only when necessary while maintaining transmission reliability in appropriate conditions.
Data Source
AI summary
Techniques for uplink power control (e.g., for New Radio (NR)) are disclosed. A wireless transmit/receive unit (WTRU) may determine that the WTRU is to perform a first and a second transmissions using a first and a second transmission beams. The WTRU may determine an uplink transmission power for one or more of the first or second transmissions. For example, if the angular separation of the first and the second transmission beams is greater than a first separation threshold, the WTRU may determine the uplink transmission power having a first maximum power level parameter and a second maximum power level parameter. If the angular separation of the first and the second transmission beams is less than a second separation threshold, the WTRU determine the uplink transmission power having a shared maximum power level parameter. The WTRU may transmit the first and second transmissions using the first and second transmission beams, respectively.