Avionics Bus Data Frame Header Compression
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Solution Overview
Problem
Current ARINC compliant data networks, such as ARINC 429, are inefficient in data payload transmission due to limited allocation of bits for payload data, resulting in decreased transmission efficiency.
Innovation Solution
A specialized avionics data network that allocates a maximum of 31 out of 32 bits for payload data by reducing the size of headers and eliminating unnecessary bits, allowing for efficient data transfer by using a single-bit indicator (SBI) and optional CRC, enabling larger payload data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ARINC 429 compliant data network is used with standard 18-bit payload allocation, then compatibility with existing avionics systems is maintained, but transmission efficiency is decreased
Solution Approach 1:
The patent implements dynamic payload allocation where the number of bits available for payload data varies based on the data group type. Different data groups (e.g., sensor data, control data, communication data) are assigned different payload sizes within the same 32-bit frame structure, allowing optimal utilization of available bandwidth while maintaining ARINC 429 compatibility through standardized frame formats and destination identifiers.
2Productivity
If more bits are allocated for payload data, then transmission efficiency is improved, but the ability to perform error checking and data identification is reduced
Solution Approach 1:
The patent applies local quality by differentiating the bit allocation based on data group characteristics. Critical data groups requiring error checking maintain adequate payload space alongside CRC fields, while less critical data groups can utilize maximum payload allocation. The destination identifier and data group type are encoded with optimized bit lengths based on the specific data being transmitted, allowing flexible balance between payload size and reliability features.
3Adaptability or versatility
If standard ARINC 429 frame format is used, then system compatibility is maintained, but the percentage of bits available for payload data is limited to 18 out of 32
Solution Approach 1:
The patent segments the 32-bit frame into variable-length fields based on data group requirements. Rather than using fixed 18-bit payload allocation, the frame structure is divided into: destination identifier (variable bits), data group type indicator (fixed bits), payload data (variable bits), and optional CRC (variable bits). This segmentation allows the payload to occupy 20-31 bits depending on the data group, while maintaining compatibility through standardized frame synchronization and addressing mechanisms.
Data Source
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AI summary
A method (500) for transmitting a set of conforming data frames (52) in a specialized data network (50), the method comprising generating (502) a specialized header (54), providing (504) the specialized header (54) to a data destination (20), generating (506) a set of conforming data frames (72), providing (508) at least a subset of the conforming data frames (72) to the data destination (20), identifying (510) the subset (S1, S2, S3, S4, S5) of conforming data frames (72), and performing (512) processing operations on the stored subset (S1, S2, S3, S4, S5) of conforming data frames (72).