Protocols to Reduce CPS Sensor Traffic Using Smart Indexing and Edge Computing Support

Abstract

We propose a new approach for lossless data compression to reduce the amount of data transmitted by Cyber-Physical Systems (CPS) by several-fold. Our approach uses an indexing technique inspired in the concept of generalized deduplication to compress data by a) finding matches of similar (not necessarily equal) data chunks, and b) exploiting data chunks previously stored in the Edge (or Cloud) by the same or even other CPS devices. We propose a mathematical model to predict the gains based on the number of previously received chunks and validate it using simulations. We show that compression factors of 23-fold are possible even with a limited number of previously stored chunks in the Edge. Gains of 2.8-fold over DEFLATE compression on differential samples are possible even for small data chunks (16 B) for synthetic data. Using real-world CPS data sets, we show that our technique can provide gains of up to 2.9. We also show our solution's processing speed in a Raspberry Pi 3 can be as high as 163 MB/s.