Variable Power Control Parameters for Wireless Signal Response
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Solution Overview
Problem
Conventional methods for forward and reverse link power control in wireless telecommunications networks are slow to respond to rapid changes in RF conditions, such as 'fast fades,' which can lead to poor signal quality and call drops.
Innovation Solution
Implementing variable power control parameters that adjust based on signal quality metrics like signal-to-noise ratio (SNR) and frame error rate (FER), allowing for larger adjustments during low signal quality to quickly compensate and reduce power when conditions improve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional fixed power control parameters are used, then the system is simple to operate, but the response speed to rapid RF condition changes is slow
Solution Approach 1:
The patent implements dynamic power control parameters that automatically adjust based on observed error levels. The system transitions from fixed parameters to variable parameters that adapt in real-time to RF conditions, enabling faster response to fast fades while maintaining operational simplicity through automated adjustment mechanisms.
Solution Approach 2:
The system changes power control parameters (target SNR, power adjustment increments) based on observed error levels. When error levels indicate poor signal quality, the system adjusts parameters to enable larger power increases; when conditions improve, parameters are adjusted to enable faster power reductions, optimizing response speed across different operating conditions.
2Speed
If larger power adjustments are made during low signal quality, then the response to fast fades is faster, but the power usage increases
Solution Approach 1:
The system dynamically adjusts power control parameters based on observed error levels. During low signal quality, larger power adjustment increments are applied to quickly compensate for fast fades. When signal quality improves, the system reduces power using adjusted parameters that enable faster descent, thereby optimizing overall power consumption while maintaining fast response capability.
Solution Approach 2:
The system continuously monitors error levels and uses this feedback to adjust both the target SNR and power adjustment increments. This closed-loop control ensures that large power adjustments are applied only when necessary (during fast fades), while normal operating conditions use more conservative adjustments, optimizing the balance between response speed and power consumption.
3Reliability
If the setpoint is adjusted frequently to maintain signal quality, then the signal quality is maintained better, but the control system complexity increases
Solution Approach 1:
The system adjusts the target SNR parameter based on observed error levels to maintain signal quality. By dynamically changing the target SNR rather than making frequent setpoint adjustments, the system maintains better signal quality during fast fades while avoiding the complexity of continuous control parameter reconfiguration.
Solution Approach 2:
The system proactively adjusts the target SNR based on observed error trends before signal quality deteriorates completely. This preliminary action prevents the need for more complex reactive control mechanisms, maintaining signal quality through anticipatory parameter adjustment rather than frequent corrective setpoint changes.
Data Source
AI summary
Methods and systems for adjusting a transmit power of a forward link or reverse link signal make use of variable adjustment parameters. The wireless signal is received to obtain a received signal. An observed signal-to-noise ratio (SNR) and an observed frame error rate (FER) for the received signal are determined. In an outer loop process, an adjustment increment is selected based on how much the observed FER differs from the target FER, and the target SNR is adjusted by the adjustment increment. In an inner loop process, a power adjustment command is selected based on a comparison between the observed SNR and a target SNR. The power adjustment command instructs the transmitter of the wireless signal to either increase or decrease the transmit power of the wireless signal. The power adjustment increment may also depend on the observed FER.