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A Hybrid Data-Differencing and Compression Algorithm for the Automotive Industry.

Sabin Belu¹, Daniela Coltuc¹

¹Doctoral School of Electronics, Telecommunications and Information Technology, Politehnica University of Bucharest, 061071 Bucharest, Romania.

Entropy (Basel, Switzerland)

|May 28, 2022

Summary

This summary is machine-generated.

This study introduces Keops, an innovative delta-differencing algorithm for software updates. Keops combines LZ77 compression with binary differencing, outperforming existing methods in speed and compression ratio for efficient over-the-air updates.

Keywords:

LZ77 LZFG LZMA Lempel–Ziv OTA software update automotive big data bsdiff delta encoding vcdiff

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Area of Science:

Computer Science
Data Compression
Software Engineering

Background:

Software updates, particularly over-the-air (OTA), require efficient methods for transmitting changes.
Binary differencing is crucial for minimizing update sizes, but performance can be a bottleneck.
Existing solutions often involve trade-offs between compression ratio and update speed.

Purpose of the Study:

To develop and evaluate an innovative delta-differencing algorithm for software updates.
To enhance the performance of OTA software updates in terms of speed and compression ratio.
To compare the proposed algorithm against existing binary differencing solutions.

Main Methods:

The study proposes Keops, a novel algorithm integrating LZ77 data compression with binary differencing techniques.
The method focuses on creating pre-compressed binary-differencing streams.
Server-side and client-side software strategies for update creation and installation were developed.

Main Results:

Keops demonstrated superior performance compared to an LZMA-based binary differencing solution.
Achieved over 3% better compression ratio in specific cases.
Showed 2-5 times faster decompression speeds.
Performance gains increased with larger history buffers, achieving up to three times better delta rates.

Conclusions:

The Keops algorithm offers significant improvements in both compression ratio and decompression speed for software updates.
It provides a more efficient solution for OTA software updates compared to current methods.
The algorithm's effectiveness is enhanced by utilizing larger history buffers in delta creation.