--- title: Delta Compression for OTA Updates | Excelfore description: Learn how delta compression reduces OTA update size in connected vehicles, improving bandwidth efficiency and update speed. Insights from Excelfore. image: https://excelfore.com/hubfs/Delta%20Compression%20for%20OTA%20Updates.png --- [Skip to content](https://excelfore.com/blog/delta-compression-ota-update-connected-vehicles#main-content) Join Excelfore at CAEV EXPO 2024 at KTPO Bengaluru, 14th -15th March. 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Modern vehicles contain dozens of electronic control units (ECUs), domain controllers, and increasingly powerful high-performance computing (HPC) systems that host large software stacks. Delivering full binary images for every update quickly becomes inefficient in terms of bandwidth, time, and operational cost. [Delta compression](https://excelfore.com/blog/delta-compression-differential-automotive-software-updates)—also known as differential updating—offers a practical solution by transmitting only the differences between two software versions rather than the entire software package. In connected vehicle fleets, update size directly affects several operational factors: - Cellular bandwidth consumption - Update duration over constrained networks - Vehicle downtime during installation - Energy consumption, particularly in electric vehicles - Scalability of update campaigns across large fleets When full images are transmitted for every update, even minor software changes can require hundreds of megabytes or more in network traffic. Delta compression dramatically reduces this burden by generating a compact difference file that represents only the changes between the installed software version and the new version available in the cloud. For large binary images—such as Linux operating systems, Android-based infotainment stacks, or head-unit firmware—the reduction can be substantial. Typical delta-based updates achieve reductions of 70% to 99% compared with full-image downloads. Consider a practical example: updating a 1 GB infotainment image using a delta package of 70–150 MB. This approach reduces network transmission by hundreds of megabytes per vehicle. When multiplied across fleets of thousands of vehicles, the operational savings become significant. Reduced payload sizes also allow updates to complete more quickly, improving both cloud resources utilisation and overall campaign efficiency. Conclusion Delta compression transforms OTA delivery from a bandwidth-intensive process into a scalable and efficient operation. By transmitting only the changes between software versions, automotive manufacturers can reduce communication costs, accelerate update campaigns, and improve fleet-wide reliability. As vehicles increasingly rely on large software platforms, differential updating becomes essential for practical OTA deployment at scale.   ###### Category - [Blog](https://excelfore.com/blog/tag/blog) - [Product- Cloud eSync eDatX AI](https://excelfore.com/blog/tag/product-cloud-esync-edatx-ai) - [Press](https://excelfore.com/blog/tag/press) - [Media](https://excelfore.com/blog/tag/media) - [Product- In-vehicle Networks](https://excelfore.com/blog/tag/product-in-vehicle-networks) - [Case Studies](https://excelfore.com/blog/tag/case-studies) - [Delta Compression](https://excelfore.com/blog/tag/delta-compression) ###### Popular Post - [How Tata Motors and Excelfore are Delivering a Comprehensive Over-the-Air Software Update and Remote Diagnostics Platform, starting with the New Tata Sierra](https://excelfore.com/blog/tata-motors-excelfore-ota-software-update-remote-diagnostics-new-tata-sierra) - [Excelfore Delivers Production-Grade OTA and Remote Diagnostics Platform for Tata Motors with New Tata Sierra](https://excelfore.com/blog/excelfore-delivers-production-grade-ota-and-remote-diagnostics-platform-for-tata-motors-with-new-tata-sierra) - [SOME/IP vs DoIP Explained](https://excelfore.com/blog/some-ip-doip) - [Automotive Ethernet vs CAN vs LIN vs FlexRay Comparison | Excelfore](https://excelfore.com/blog/automotive-ethernet-vs-can-vs-lin-vs-flexray) - [Hero MotoCorp Adopts eSync from Excelfore for Over-the-Air Vehicle Updates](https://excelfore.com/blog/hero-motocorp-adopts-esync-from-excelfore-for-over-the-air-vehicle-updates) ###### Subscribe ### Leave a Comment ### Similar Blogs ![Low-Cost, Low-Risk OTA Integration with eSync SDK | Excelfore](https://excelfore.com/hs-fs/hubfs/Imported_Blog_Media/Excelfore-eSync-SDK_cmyk_300dpi-1.jpg?width=352&name=Excelfore-eSync-SDK_cmyk_300dpi-1.jpg) #### [Low-Cost, Low-Risk OTA Integration with eSync SDK | Excelfore](https://excelfore.com/blog/excelfore-esync-sdk-drives-low-cost-low-risk-integration-of-ota) By [Mark Singer](https://excelfore.com/blog/author/mark-singer) 26 May 2020 **Developer’s kit accelerates time-to-market for connected systems in automotive and industrial...** [READ MORE](https://excelfore.com/blog/excelfore-esync-sdk-drives-low-cost-low-risk-integration-of-ota) ![Excelfore Adaptive Delta Compression: An Automated Approach to Differential Updates](https://excelfore.com/hs-fs/hubfs/Excelfore%20Adaptive%20Delta.png?width=352&name=Excelfore%20Adaptive%20Delta.png) #### [Excelfore Adaptive Delta Compression: An Automated Approach to Differential Updates](https://excelfore.com/blog/adaptive-delta-compression-for-ota-excelfore) By [Excelfore](https://excelfore.com/blog/author/excelfore) 17 April 2026 [READ MORE](https://excelfore.com/blog/adaptive-delta-compression-for-ota-excelfore) #### [Adaptive Delta Compression for Automotive OTA | Excelfore](https://excelfore.com/blog/excelfore-optimizes-automotive-ota-updates-with-adaptive-delta-compression) By [Mark Singer](https://excelfore.com/blog/author/mark-singer) 14 September 2017 Over-the-air (OTA) software updates have become the backbone of the **connected vehicle**. 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