Information topology of communication protocol for highperformance industrial automation systems and IoT applications

Abstract

The article presents the structure of the communication protocol for industrial management and IoT applications, designed to meet the requirements for quality of service (QoS), which consisting of low latency and high reliability. The protocol ensures reliability without relying on time or frequency diversity created by natural motion, multipath spreading or frequency selectivity. In this article considers the minimum SNR required to achieve the probability of failure of the cycle 10-9, which is used to compare different protocols as the network size increases. It is shown that a single-pass circuit that does not use a compatible connection requires a high nominal signal-to-noise ratio. Even an idealised hybrid automatic repeat request (HARQ) cannot eliminate the need to use high power to overcome one in a billion cases of fading. The article also shows what an idealised abrupt frequency adjustment can achieve, assuming that the natural frequency diversity. For fairly large networks, it has been demonstrated that when using shared communication, you can get not much worse performance when a subset of nodes in turn retransmits existing messages. An additional strengthening of 20 dB is possible by switching to the Occupy CoW protocol described in the article, which combines retransmission with simultaneous transmission of messages via relays. The protocol can be optimised for bidirectional tracking, using the fact that the path of achievement is the same in both directions. Consequently, the XOR operation for two-packet can be used either to save time or to reduce the minimum signal-to-noise ratio required to meet protocol performance requirements. The description of network settings is given, which considered in this article. The structure of the protocol based on multi-user diversity is considered. Describes Occupy CoW. A comparison of the production of the proposed protocol with hypothetical schemes based on frequency dilution, as well as with schemes that do not use modern transmissions. The proposed protocol is primarily intended to be used in the case of spatial distribution and does not include any repetitions in time or frequency.