Modem Modulation Mode Inversion Control for Throughput Stability
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Solution Overview
Problem
Current modem technologies experience unstable downstream data throughput due to frequent inversions between high-order and low-order modulation modes, caused by discrepancies in codeword error rate calculations based on user communication data and test data, leading to continuous switching and reduced overall throughput.
Innovation Solution
A modem is configured to detect and count inversions within a predetermined time, then sets and maintains the modulation mode to a lower order than the highest modulation order involved in the inversion process for a set period, preventing constant mode switching and stabilizing data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the modem uses high-order modulation mode to increase data throughput, then the data transmission efficiency is improved, but the system becomes sensitive to channel noise causing frequent mode inversions and instability
Solution Approach 1:
The patent applies preliminary anti-action by detecting modulation mode inversions before they cause significant throughput degradation. When a predetermined number of inversions are detected within a first predetermined time period, the system proactively switches to a lower modulation mode and maintains it for a second predetermined time, preventing the instability from severely impacting performance.
Solution Approach 2:
The patent implements dynamics by creating an asymmetric switching mechanism: the modem can freely switch between modulation modes based on channel conditions, but when inversion threshold is reached, it dynamically imposes a restriction by maintaining the current lower-order mode for a predetermined time period, thereby stabilizing the system while preserving adaptability.
2Adaptability or versatility
If the modem frequently switches between high-order and low-order modulation modes to adapt to channel conditions, then the adaptability is improved, but the downstream data throughput decreases due to continuous switching
Solution Approach 1:
The patent applies periodic action by introducing a predetermined time period during which the modulation mode is held constant after detecting inversions. This periodic restriction prevents continuous switching, allowing the system to adapt to channel changes while avoiding the throughput penalty of frequent mode transitions.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the modem in a stable lower-order modulation mode for a predetermined time period after detecting inversions. This continuous stable operation prevents the disruption of data transmission that would occur with frequent mode switching, thereby preserving overall throughput.
3Measurement precision
If the modem calculates codeword error rate based on test data to determine mode switching, then the measurement precision is improved, but the codeword error rate calculation becomes inaccurate due to small sample size
Solution Approach 1:
The patent merges the determination of modulation mode switching from multiple factors rather than relying solely on codeword error rate calculation from test data. By combining inversion detection (counting mode switches within a time period) with error rate thresholds, the system achieves more reliable mode selection that compensates for the small sample size limitation of test data.
Data Source
AI summary
The present disclosure relates to a method, a medium, a program product, and a modem for setting modulation modes. The method includes detecting by a modem whether a modulation mode of the modem is inverted, the modem being capable of operating in a plurality of modulation modes, and each modulation mode having a different modulation order; and in response to the determination that the number of times of inversion of the modulation mode within a first predetermined time has reached a threshold, setting by the modem the modulation mode of the modem to a modulation mode other than a modulation mode with the highest modulation order in all modulation modes included in the inversion process and maintaining the set modulation mode for a second predetermined time. By the above method, the modulation mode is prevented from repeatedly inverting, thereby maintaining the downstream data throughput at a high level.