Dynamic Closed-Loop Uplink Power Control with P0 Target Adaptation
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Solution Overview
Problem
Existing uplink power control systems in wireless networks face challenges in dynamically adapting transmit power to overcome variations in channel conditions, leading to suboptimal network performance and UE battery life due to the use of a constant P0 nominal PUSCH value.
Innovation Solution
Implementing dynamic closed loop power control by adjusting the P0 nominal PUSCH value based on signal strength comparisons and noise levels to optimize transmit power, ensuring successful decoding and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant P0 nominal PUSCH value is used for uplink power control, then the system is simple to operate, but network performance deteriorates and UE battery life is reduced due to inability to adapt to channel variations
Solution Approach 1:
The P0 nominal PUSCH value is transformed from a static constant to a dynamic parameter that adjusts based on channel conditions. The base station measures uplink signal strength and compares it with the nominal target value, then sends power control commands to the UE to increase or decrease transmit power accordingly, enabling adaptation to varying channel quality while maintaining systematic control
Solution Approach 2:
A closed-loop feedback mechanism is implemented where the base station continuously monitors the uplink signal strength received from UEs, compares it with the nominal target value, and sends power control commands back to the UEs. This feedback loop enables real-time adjustment of transmit power to maintain optimal signal quality and network performance
2Reliability
If transmit power is increased to meet SINR or BER requirements, then signal quality at the base station improves, but co-channel interference in the network increases
Solution Approach 1:
The base station measures the actual uplink signal strength and provides feedback to the UE about whether the signal is too high or too low relative to the nominal target. This allows precise adjustment of transmit power to achieve the minimum required for acceptable signal quality, preventing excessive power transmission that would cause interference to other channels
Solution Approach 2:
The transmit power parameter is dynamically adjusted based on the comparison between measured signal strength and the nominal target value. By changing this parameter in response to actual channel conditions, the system achieves adequate signal quality while minimizing unnecessary power increases that would generate co-channel interference
3Object-generated harmful factors
If transmit power is decreased to minimize co-channel interference, then network interference is reduced, but signal quality at the base station deteriorates
Solution Approach 1:
The closed-loop system continuously monitors uplink signal strength and provides feedback to prevent power reduction below the level required for acceptable signal quality. The base station compares measured signal strength with the nominal target value and sends commands to increase power when the signal is too weak, ensuring signal quality is maintained while only reducing power when channel conditions permit
Solution Approach 2:
The transmit power parameter is adjusted dynamically based on actual channel conditions rather than being fixed at a low value to minimize interference. The system changes this parameter upward when signal quality deteriorates and downward when conditions improve, achieving the optimal balance between interference reduction and signal quality maintenance
Data Source
AI summary
Aspects provided herein provide methods, systems, and a non-transitory computer storage media storing computer-useable instructions for dynamic closed loop power control. The method begins with a base station receiving an uplink message from at least one user equipment (UE) device. Next, the signal strength of the uplink message is measured. The signal strength of the uplink message is then compared with a first nominal target value. Based on the comparison, the first nominal target value can be adjusted to a second nominal target value. The nominal target value may be a P0 nominal physical uplink shared channel (P0 nominal PUSCH).