ARINC 664 Switch Dynamic Bandwidth Allocation
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Solution Overview
Problem
Deterministic aircraft data networks like ARINC 664 are inefficient for periodic large block data flows or large file transfers due to rate constraints on virtual links, which can't be easily increased without affecting other links and may involve different link speeds, limiting data transfer speed.
Innovation Solution
The solution involves releasing rate constraints for low-priority maintenance traffic in the ARINC 664 region, allowing it to be transmitted only when there is no other scheduled traffic, and separating network switches into zones for efficient data transfer, using techniques like wave division multiplexing to manage different data types on separate wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If virtual link bandwidth is increased to improve large file transfer speed, then data transfer rate is improved, but other virtual links are interfered with even if they are not currently being used
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the physical link bandwidth is not statically assigned to individual virtual links but is dynamically shared based on current traffic demands. The network switch monitors traffic patterns and adjusts bandwidth allocation in real-time, allowing virtual links to access unused bandwidth from other idle virtual links, thereby improving large file transfer speeds without permanently interfering with other links' performance.
Solution Approach 2:
The patent creates a unified bandwidth pool that serves multiple virtual links simultaneously rather than dedicating separate bandwidth to each link. This multi-functional bandwidth resource can be dynamically allocated to any virtual link that has current traffic demands, allowing the same physical infrastructure to efficiently serve both time-critical traffic and bulk data transfers without requiring separate dedicated channels for each function.
2Adaptability or versatility
If a high bandwidth physical connection is bridged through a switch to a lower bandwidth connection, then connectivity is improved, but the data transfer speed is constrained by the lowest bandwidth connection
Solution Approach 1:
The patent implements dynamic path selection and bandwidth aggregation where data traffic can be routed through multiple physical connections simultaneously or switched between different paths based on current bandwidth availability. Instead of being constrained by the lowest bandwidth link in a fixed path, the system dynamically identifies and utilizes available bandwidth across multiple physical connections, allowing high-speed transfers even when some individual links have lower bandwidth.
Solution Approach 2:
The patent segments the data transfer path into multiple parallel physical connections rather than relying on a single bridged path. By dividing the traffic flow across multiple segmented links, the system can aggregate bandwidth from several connections to achieve higher overall transfer speeds, overcoming the bottleneck effect of any single low-bandwidth link in the chain.
3Speed
If an entirely separate physical layer is added to the airplane dedicated to bulk data transfers, then bandwidth for large file transfers is improved, but cost and weight increase prohibitively
Solution Approach 1:
The patent makes the existing aircraft data network infrastructure multi-functional by enabling it to handle both time-critical avionics traffic and bulk data transfers using the same physical connections and network switches. Through dynamic bandwidth allocation and traffic prioritization, the existing network serves dual purposes without requiring a separate dedicated physical layer for bulk transfers, thereby avoiding the prohibitive cost and weight penalties of additional wiring and hardware.
Solution Approach 2:
The patent changes the operational parameters of the existing network infrastructure, specifically the bandwidth allocation and traffic scheduling parameters, to optimize for bulk data transfers when needed. By dynamically adjusting these parameters rather than adding physical infrastructure, the system achieves improved bulk transfer bandwidth while maintaining the same lightweight network hardware already installed in the aircraft.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances bandwidth for non-essential data transfers without interfering with critical traffic, ensuring no additional delay and allowing low-priority traffic to utilize available bandwidth during slack times, thus improving overall network efficiency.
Implementation Method 1
using techniques like wave division multiplexing to manage different data types on separate wavelengths
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Provided are mechanisms for improving bandwidth for non-essential data on deterministic aircraft data networks (ADNs) such as ARINC 664 networks. A switch such as an ARINC 664 switch maintains rate constrains on one or more priority levels of traffic while releasing rate constraints on low priority traffic. Low priority traffic can be received at an ARINC 664 switch at rates allowed by an Ethernet physical layer. However, low priority, non-rate constrained traffic is transmitted only when there are no other scheduled messages to send. Low priority traffic can consume all available bandwidth whenever there is slack time. A switch can further be separated into zones including a standard rate constrained zone as well as a rate unconstrained zone. Internal or external cross-links can be provided between the zones for any data that needs to be transferred between zones.