Reverse Loop Power Targeting via Statistical Interference Sampling
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Solution Overview
Problem
CDMA wireless systems face inefficiencies due to higher-than-needed transmission power levels and slow adaptation to rapidly changing signal conditions, leading to increased interference and unacceptable bit error rates, especially during data bursts and mobility scenarios.
Innovation Solution
Eliminating the outer control loop and setting power targets based on statistical measurements of interference and transceiver activity, rather than real-time frame error rates, to achieve improved signal-to-noise ratios at nominal power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer control loop is used to set power targets based on frame error rate monitoring, then communication quality is maintained, but transmission power is higher than needed and interference increases
Solution Approach 1:
The patent removes the outer control loop from the power control system, extracting only the essential power target setting function. By eliminating the frame error rate-based outer loop, the system avoids the conservative power targeting behavior that causes excessive power consumption and interference, while maintaining reliability through the inner loop's rapid adjustments.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors the actual received power levels from transceivers and uses this information to dynamically adjust power targets. This feedback loop allows the system to respond to actual channel conditions rather than relying on conservative error rate thresholds, thereby reducing unnecessary power consumption while maintaining communication quality.
2Reliability
If the outer control loop monitors frame error rate to adjust power targets, then acceptable error levels are maintained, but the system cannot react rapidly to changing transmission conditions
Solution Approach 1:
The patent extracts the power control function from the slow outer loop and places it entirely within the inner loop system. By removing the frame error rate monitoring outer loop, the system eliminates the bottleneck that limits response speed, allowing power adjustments to occur at the faster inner loop interval without being constrained by slow error rate measurements.
Solution Approach 2:
The patent implements preliminary power target setting based on statistical interference measurements and transceiver activity patterns. By pre-calculating appropriate power targets using these statistical metrics before transmission events occur, the system can respond rapidly to changing conditions without waiting for error rates to manifest, thus maintaining both reliability and speed.
3Reliability
If power targets are set with safety factors to ensure acceptable performance, then communication reliability is improved, but average transmission power increases and interference to other transceivers increases
Solution Approach 1:
The patent converts the potentially harmful effect of power variability into a benefit by using statistical measurements of interference and transceiver activity to set power targets. Instead of adding safety factors that cause excessive power consumption, the system uses statistical knowledge of the environment to precisely set power levels that are sufficient for reliability without generating unnecessary interference.
Solution Approach 2:
The patent changes the parameters used for power target setting from frame error rate thresholds to statistical measurements of interference levels and transceiver activity. This parameter change allows the system to adapt power targets to actual environmental conditions rather than using fixed conservative margins, thereby reducing interference while maintaining reliability.
4Reliability
If continuous frame error rate monitoring is performed to adjust power targets, then transmission quality is maintained, but network overhead and complexity increase
Solution Approach 1:
The patent extracts the power control decision-making function from the complex outer loop monitoring system and consolidates it within the simpler inner loop framework. By removing the frame error rate monitoring outer loop, the system reduces overhead and complexity while maintaining transmission quality through the inner loop's rapid power adjustments based on statistical measurements.
Data Source
AI summary
It is possible to operate a wireless system, such as a CDMA system, in a more efficient manner by employing a statistical approach for setting power targets for reverse loop transmission. Unlike present methods for setting such targets a figure-of-merit quantity such as the frame error rate need not be measured to set the reverse loop transmission power for a wireless unit. Instead the target is set on a statistical basis established by sampling. Real time measurement of a quantity-of-merit is not required. A statistical approach produces among other things a decreased sensitivity to rapid changes in transmission conditions.