Adaptive Threshold Mechanism for Reverse Link Loading Control

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Solution Overview

Problem

Radio communication systems face inefficiencies and instability due to improper management of reverse link loading conditions, leading to under-utilization of network resources and capacity issues, as existing fixed threshold approaches fail to adapt effectively to changing loading conditions.

Innovation Solution

An adaptive threshold mechanism is implemented, adjusting the rise over thermal (ROT) threshold based on an overshoot rate parameter, which specifies the number of times a target rate is exceeded, to dynamically manage transmission rates and power levels, ensuring efficient resource utilization and system stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed threshold approach is used to manage reverse link loading conditions, then the system is simple to implement, but it fails to adapt to changing loading conditions resulting in under-utilization of network resources and system instability

Engineering Contradiction:

Improveadaptability to loading conditionsVSAvoidthreshold management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by transitioning from a fixed threshold to a dynamic threshold that automatically adjusts based on measured system performance. The threshold is modified according to the number of times the target rate is exceeded, allowing the system to adapt to changing loading conditions while maintaining manageable complexity through automated adjustment mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by measuring the number of times the target rate is exceeded and using this information to adjust the threshold. This closed-loop feedback mechanism allows the system to learn from its own performance and automatically optimize threshold settings, improving adaptability without requiring complex manual configuration.

Inventive Principle:

Principle #23Feedback

2Reliability

If the threshold is set to be sensitive to loading conditions, then system stability is improved, but the threshold may be adjusted too frequently causing instability in rate control

Engineering Contradiction:

Improvesystem stabilityVSAvoidthreshold adjustment stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies partial action by adjusting the threshold based on the count of rate exceedances rather than reacting to every individual exceedance event. This cumulative approach filters out transient fluctuations and only triggers threshold adjustments when a pattern of excessive rate violations occurs, thereby maintaining system stability while still responding to genuine loading conditions.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS7881725B2Method and apparatus for providing adaptive thresholding for adjustment to loading conditions

Publication Date: 2011.02.01 NOKIA TECHNOLOGIES OY

AI summary

An approach is provided for adaptively adjusting a threshold relating to a loading condition of a communication link. The threshold (e.g., rise over thermal (ROT) threshold) is adaptively adjusted the threshold based on an overshoot rate parameter that specifies number of times a target rate is exceeded and based on number of occurrences of an overshoot event.