Requirements Analysis for OPC UA over CoAP
draft-wang-core-opcua-transmition-requirements-00

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Core                                                            H. Wang
Internet Draft                                                    C. Pu
Interned status: Standards Track                                P. Wang
Expires: July 1, 2017                                           Y. Yang
                                                               D. Xiong
                                                Chongqing University of
                                           Posts and Telecommunications
                                                      December 28, 2016

                Requirements Analysis for OPC UA over CoAP
             draft-wang-core-opcua-transmition-requirements-00

Abstract

   Industrial Internet of Things is an attractive application area for
   Constrained Application Protocol (CoAP). OPC Unified Architecture
   (OPC UA) defines a semantic-based information model for industrial
   control system that can satisfy the requirements of Industry 4.0
   based on semantic information exchange. This document analyses
   requirements for OPC UA transmission over CoAP.

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   This Internet-Draft will expire on July 1, 2017.

Wang, et al.               Expires July 1, 2017               [Page 1]
 Internet-Draft              OPC UA Over CoAP             December 2016

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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 ......................................... 5
   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 limited networks that has been widely used in machine-
   to-machine (M2M) communications [RFC7252]. However, 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 is not only based on data transmission, but also based
   on semantic information exchange. Driven by this, using CoAP in the
   IIoT, there is a need to provide good support for data 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 62541-1] is very promising and its transmission mode is

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