5G Terminal Transmission Power Control with Beamforming Step Size
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Solution Overview
Problem
Current methods for transmission power control in 5G New Radio (NR) do not adequately account for beamforming, leading to incorrect power control and increased interference after beam switching, which affects signal quality and system performance.
Innovation Solution
A terminal and base station system that calculates and adjusts transmission power using a circuit with correction values having larger step sizes, allowing for rapid correction of quality errors after beamforming changes without increasing DCI signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power control is performed using conventional LTE methods without beamforming consideration, then the control mechanism remains simple, but transmission power cannot be accurately controlled after beam switching causing increased interference
Solution Approach 1:
The patent changes the parameter of correction value step size based on beam switching conditions. When beam switching is detected, a larger step size correction value is applied to enable rapid power adjustment. This parameter change allows the system to adapt to beamforming changes without requiring a completely new control mechanism, thus improving reliability while maintaining manageable complexity.
Solution Approach 2:
The patent introduces dynamic adjustment of correction values based on beam switching events. The correction value is not fixed but changes dynamically - using a first correction value for normal conditions and a second correction value with larger step size when beam switching occurs. This dynamic approach enables accurate power control after beam switching while building upon the existing LTE framework.
2Speed
If correction values with large step sizes are used for rapid power adjustment after beam switching, then convergence speed improves, but transmission power may overshoot the optimal value
Solution Approach 1:
The patent employs periodic adjustment through multiple correction values. The terminal first applies a large step size correction value immediately after beam switching to achieve rapid convergence. Then, it transitions to using smaller correction values in subsequent adjustments. This periodic switching between different correction value magnitudes enables both fast initial convergence and precise final adjustment.
Solution Approach 2:
The patent applies preliminary action by using large step size correction values in the initial adjustment phase after beam switching. Before the system reaches the optimal power level, it first makes rapid progress toward the target using the larger correction value. This preliminary rapid adjustment is followed by finer tuning, ensuring both speed and precision are achieved in sequence.
3Adaptability or versatility
If multiple correction values with different step sizes are implemented, then beamforming-aware power control is achieved, but signaling overhead increases
Solution Approach 1:
The patent segments the correction values into different types (first correction values with smaller step sizes and second correction values with larger step sizes). This segmentation allows the system to convey different control intentions through distinct correction value sets. By organizing correction values in this segmented manner and associating them with specific beam switching conditions, the system achieves beamforming adaptability while controlling signaling overhead through structured information transmission.
Data Source
AI summary
In a terminal, a transmission power calculation unit calculates a transmission power of an uplink signal by using transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of the transmission power. A wireless transmission unit transmits the uplink signal with the above transmission power. A first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.