Active RIS Power Control Across UE Connection States
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Solution Overview
Problem
Existing passive RIS systems require a large number of elements to achieve capacity gains, leading to increased complexity and signal overhead, while active RIS introduces thermal noise and power consumption, necessitating effective power control schemes to optimize performance in varying network conditions and UE states.
Innovation Solution
Implement power control schemes for active RIS by enabling or disabling the RIS based on link performance, setting power values, and adjusting reflecting coefficients according to QoS requirements and link conditions, specifically for different UE connection states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive RIS is used to improve capacity gain, then the number of elements required increases to thousands, but this leads to increased device complexity and signal overhead
Solution Approach 1:
The patent changes the operational state of RIS elements from passive to active by introducing power supply and amplification capability. This parameter change allows achieving the same capacity gain with significantly fewer elements (from thousands to a manageable number), thereby reducing device complexity while maintaining reliability.
Solution Approach 2:
The patent replaces the passive mechanical/scattering-based RIS system with an active electronically-controlled system. By substituting passive scattering elements with active amplifying elements controlled by power supply circuits, the system achieves better performance with reduced complexity.
2Device complexity
If active RIS is used to reduce the number of elements, then the system complexity decreases, but thermal noise and power consumption increase
Solution Approach 1:
The patent implements dynamic power control for active RIS elements, adjusting the power supply and amplification level based on real-time channel conditions, QoS requirements, and UE connection states. This dynamic adjustment optimizes the balance between maintaining adequate signal strength and minimizing power consumption, thereby reducing energy loss while keeping device complexity manageable.
Solution Approach 2:
The patent dynamically changes operational parameters including power supply levels, amplification factors, and reflecting coefficients based on network conditions. By adjusting these parameters, the system minimizes power consumption and thermal noise generation while maintaining the reduced number of elements advantage.
3Reliability
If active RIS elements are powered to amplify signals, then signal quality improves, but thermal noise is introduced
Solution Approach 1:
The patent optimizes the amplification factor parameter of active RIS elements to achieve the desired signal quality while minimizing thermal noise generation. By carefully controlling the amplification level based on channel conditions and QoS requirements, the system maintains signal quality without excessive noise introduction.
Solution Approach 2:
The patent implements feedback mechanisms that monitor signal quality and adjust the amplification level of active RIS elements accordingly. This feedback control ensures that the amplification is optimized to improve signal quality while minimizing thermal noise generation, as the system continuously adapts to maintain the optimal balance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances wireless transmission by optimizing active RIS performance through dynamic power control, improving link quality and coverage in both connected and non-connected UE states, reducing power consumption and complexity.
Implementation Method 1
the active RIS will introduce the thermal noise and additional power consumption for the amplifier in each active element
Implementation Method 2
The scattering elements can be controlled in a software-defined manner to change the electromagnetic (EM) properties (e.g., phase shift) of the reflection of the incident radio frequency (RF) signals
Data Source
AI summary
Methods and apparatuses for power control schemes for active RIS are disclosed. In one embodiment, a base unit comprises a processor; and a transceiver coupled to the processor, wherein, the processor is configured to transmit, via the transceiver. a message to enable an active RIS.