Dynamic Target Error Rate Adjustment for Wireless Power Control
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Solution Overview
Problem
Conventional power control methods in wireless telecommunications networks, which use a fixed target frame error rate (FER), lead to inefficiencies due to mismatched stringency in radio frequency (RF) conditions, resulting in unnecessary high transmit power levels when conditions are good and inadequate compensation during poor conditions, causing frequent call drops.
Innovation Solution
Adjusting the target FER based on the signal strength of a pilot signal to dynamically control transmit power levels, allowing for more stringent or lenient power control depending on RF conditions, and re-evaluating the target FER as the mobile station moves to adapt to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed target FER is used for power control, then the power control process is simple to implement, but it causes unnecessary high transmit power levels when RF conditions are good and inadequate compensation when conditions are poor
Solution Approach 1:
The patent applies dynamics by making the target FER adjustable rather than fixed. The target FER is dynamically modified based on signal strength measurements and call drop detections, allowing the power control system to adapt its stringency to current RF conditions. This resolves the contradiction by enabling energy efficiency through dynamic adjustment while maintaining implementation simplicity through predefined adjustment rules.
Solution Approach 2:
The patent changes the target FER parameter based on observed system performance. When call drops are detected or signal strength deteriorates, the target FER is increased (made less stringent), and when conditions improve, it is decreased (made more stringent). This parameter adaptation allows the system to optimize power consumption while maintaining call reliability.
2Device complexity
If a fixed target FER is used for power control, then the control algorithm remains simple, but it results in frequent call drops during poor RF conditions
Solution Approach 1:
The patent implements feedback by monitoring call drop events and signal strength measurements, then using this information to adjust the target FER. The system feeds back performance data (call drops, signal quality) to modify the power control target, creating a closed-loop system that improves reliability while maintaining algorithm simplicity through rule-based adjustments.
Solution Approach 2:
The patent applies preliminary action by proactively adjusting the target FER before call drops occur. When signal strength deteriorates or call drops are detected, the system preemptively increases the target FER to prevent further deterioration, rather than waiting for complete link failure. This anticipatory adjustment maintains reliability without requiring complex real-time intervention.
3Loss of energy
If the target FER is adjusted dynamically based on signal strength, then power consumption is optimized, but the system complexity increases
Solution Approach 1:
The patent manages complexity by implementing parameter changes through simple threshold-based rules rather than complex algorithms. The target FER is adjusted based on predefined signal strength thresholds and call drop detection rules, maintaining implementation simplicity while achieving dynamic optimization of power consumption.
Solution Approach 2:
The system applies self-service by automatically adjusting the target FER based on its own performance measurements without requiring external intervention. The mobile station autonomously monitors signal strength and call drops, then self-adjusts the power control target to optimize power consumption, reducing the need for complex network-side control.
Data Source
AI summary
A wireless communication link (a forward link or a reverse link) between a base station and a mobile station may be power-controlled to reduce a difference between an observed error rate in communications received over the link and a target error rate. The target error rate may be dependent upon the radio frequency (RF) conditions at the mobile station, which may be determined by measuring a signal strength of a pilot signal transmitted by the base station. Thus, a pilot signal strength at the mobile station may be determined, a target error rate may be selected based on the pilot signal strength, and the target error rate may be used to control a transmit power level of the wireless communication link. A mobile station may power-control a forward link and/or a base station may power-control a reverse link using a target error rate selected in this way.