Aggregated Link Modulation Adjustment for Delay Minimization
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Solution Overview
Problem
When using both link aggregation (LA) and adaptive coding and modulation (ACM) technologies, the switching of modulation modes in a link causes significant delay differences between sub-links, affecting delay-sensitive services like voice and video, leading to jitter and impacting their normal usage.
Innovation Solution
An apparatus and method that determine the transmission delay of data slices in different modulation modes across sub-links, comparing these delays to adjust the working status of sub-links by controlling their modulation modes based on preset conditions, ensuring optimal data distribution and reducing recombination delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ACM switching is performed on a sub-link to adapt to channel changes, then the adaptability of the link is improved, but the delay difference between sub-links increases
Solution Approach 1:
The patent implements a feedback mechanism where the receive end device monitors transmission delays of data slices across different sub-links, compares them against a threshold, and sends feedback information to the transmit end device. This feedback triggers dynamic adjustment of modulation modes on specific sub-links, creating a closed-loop control system that adapts to delay differences while maintaining service quality.
Solution Approach 2:
The patent makes the modulation mode of sub-links dynamic rather than static. The transmit end device can dynamically switch modulation modes on specific sub-links based on feedback information about delay differences. This dynamic adjustment allows the system to adapt to changing channel conditions while controlling delay variations, resolving the contradiction between adaptability and delay stability.
2Productivity
If data slices are evenly distributed to all sub-links, then the bandwidth utilization is improved, but the recombination delay increases
Solution Approach 1:
The patent applies local quality by treating different sub-links differently based on their transmission characteristics. Instead of uniform data distribution, the system identifies sub-links with abnormal delays and adjusts their modulation modes locally. This allows most sub-links to operate at high bandwidth utilization while problematic sub-links receive targeted adjustments to reduce delay, achieving both high productivity and low recombination delay.
3Productivity
If the modulation mode is switched to increase bandwidth, then the data transmission capacity is improved, but the transmission delay varies significantly
Solution Approach 1:
The patent changes the modulation mode parameter of sub-links dynamically based on observed transmission delays. When a sub-link exhibits abnormal delay, the system switches its modulation mode (e.g., from 64QAM to QPSK) to adjust the data transmission capacity and delay characteristics. This parameter change allows the system to optimize the trade-off between bandwidth and delay for each sub-link individually.
Data Source
AI summary
The present disclosure discloses a method and an apparatus for adjusting a working status of an aggregated link. The method includes: when determining to switch a modulation mode of a first sub-link of an aggregated link from a first modulation mode to a second modulation mode, determining a transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link; comparing the transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link with a transmission delay of transmitting a data slice by using another sub-link of the aggregated link, to obtain a difference; and if the difference meets a preset condition, sending information for controlling a working status of the first sub-link to a transmit end device, so that the transmit end device controls the working status of the first sub-link in the second modulation mode.