Multilayer Control of Networked Cyber-Physical Systems by Sabato Manfredi

Author:Sabato Manfredi
Language: eng
Format: epub
ISBN: 9783319416465
Publisher: Springer International Publishing

4.2.1 Analysis of Network Parameters Effect on WNMCS Performance

Here we consider the simulation scenario in Fig. 4.5a and analyze the effect of increasing sensor Reporting rate (Rr) on the network metrics as buffer overflow, time delay, packet losses, and reliability. As we note from Fig. 4.6a, b, there is a threshold of 5pkt/s for sensors reporting rate that produces network congestion with increasing buffer overflow and average latency. The effect of average latency is reduced with lower sink buffer size, due to the reduction of queuing time delay. Indeed queuing delay assumes particular importance respect to network performance in WNMCS differently from wired communication network case (where it is typically neglected). So, it will be a trade-off between buffer overflow, and reliability (Fig. 4.7b) and average latency that must be considered in the planning of industrial network. We would remark by Fig. 4.7a that also for low reporting rate, might occur packets loss (about 10 ) due to MAC error and/or collision phenomena.

Fig. 4.6Buffer length (a) and Delay (b) for buffer size 300 (o), 200 (x), and 50 () packets

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