Requirements Analysis for OPC UA over CoAP
draft-wang-core-opcua-transmition-requirements-01

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Core                                                            H. Wang
Internet Draft                                                    C. Pu
Intended status: Standards Track                                P. Wang
Expires: December 23, 2017                                      Y. Yang
                                                               D. Xiong
                                                Chongqing University of
                                           Posts and Telecommunications
                                                          June 21, 2017

                Requirements Analysis for OPC UA over CoAP
             draft-wang-core-opcua-transmition-requirements-01

Abstract

   Constrained Application Protocol (CoAP) is a application protocol
   for use with constrained nodes and constrained networks that is
   attractive to be applied In the Industrial Internet of Things (IIoT).
   OPC Unified Architecture (OPC UA) defines a semantic-based
   information model for industrial control system that can satisfy the
   requirements of Industry 4.0, which is based on semantic information
   exchange. This document analyses requirements for transmitting OPC
   UA over CoAP.

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   This Internet-Draft will expire on December 23, 2017.

Wang, et al.               Expires December 23, 2017           [Page 1]
 Internet-Draft              OPC UA Over CoAP                 June 2017

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Table of Contents

   1. Introduction ................................................ 2
   2. Architecture of OPC UA over CoAP ............................ 3
   3. Requirements for OPC UA over CoAP ........................... 4
      3.1. Encoding ............................................... 4
      3.2. Application Sublayer Optimization ...................... 4
      3.3. Consistency ............................................ 4
      3.4. Reliability ............................................ 5
   4. Security Considerations ..................................... 5
   5. IANA Considerations ......................................... 6
   6. References .................................................. 6
      6.1. Normative References ................................... 6
      6.2. Informative References ................................. 6
   Authors' Addresses ............................................. 7

1. Introduction

   CoAP is a web application protocol designed for resource constrained
   devices and constrained networks that has been widely used in
   machine-to-machine (M2M) communications [RFC7252].The purpose of
   applying CoAP to the Industrial Internet of Things (IIoT) is to
   provide connectivity for the devices. Whereas the communication of
   Industry 4.0 not only requires data value transmission, but also
   requires semantic information exchange. Driven by this, to use CoAP
   in the IIoT, there is a need to provide good support for messages
   transmission of the application layer in the automation field.
   According to the definition of Industry 4.0 for communication, CoAP
   needs to support the exchange of semantic information, namely the
   semantic information model. For the current protocols supporting
   semantic information model in the IIoT, the information model
   defined by OPC UA [IEC TR 62541-1] is very promising and its
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