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DetNet                                                         H. Wang
Internet Draft                                                 P. Wang
Intended status: Standards Track                               H. Yang
Expires: May 15, 2018                          Chongqing University of
                                          Posts and Telecommunications
                                                     November 11, 2017


         Joint Deterministic Scheduling Requirements for Industrial
                          Field/Backhaul Networks
                draft-wang-detnet-backhaul-requirements-02


Abstract

   This document analyzes the requirements of joint deterministic
   scheduling in industrial field/backhaul networks. The requirements
   include six aspects: determinacy, time synchronization,
   compatibility, scalability, scheduling cost and unified management.

Status of this Memo

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   This Internet-Draft will expire on May 15, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors. All rights reserved.




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   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents


   1. Introduction ................................................ 2
   2. Network Structure ........................................... 3
   3. Joint Scheduling Requirements ............................... 4
      3.1. Determinacy ............................................ 4
      3.2. Time Synchronization ................................... 5
      3.3. Compatibility .......................................... 5
      3.4. Scalability ............................................ 5
      3.5. Scheduling Cost......................................... 5
      3.6. Unified Management ..................................... 5
   4. Security Considerations ..................................... 6
   5. IANA Considerations ......................................... 6
   6. References .................................................. 6
      6.1. Normative References ................................... 6
      6.2. Informative References ................................. 6
   Authors' Addresses ............................................. 7

1. Introduction

   Industrial network includes many types of industrial field networks,
   such as the three industrial wireless network standards:
   ISA100.11a[IEC62734], WirelessHART[IEC62591] and WIA-PA[IEC62601].
   Most industrial field networks are in a middle or small size, and
   the network coverage is constant, for example, a field network
   usually covers a production area of a plant. Therefore, there is a
   need for industrial backhaul network that makes data flow from an
   industrial field network to other field networks, or transmits data
   access to Manufacturing Execution System (MES) or Enterprise
   Resource Planning (ERP). Thus, a new network architecture, the
   deterministic industrial field/backhaul network, is proposed in this
   draft. Some questions of deterministic have been described in the
   draft [I-D.finn-detnet-problem-statement], and the architecture and
   application have been illustrated in [I-D.finn-detnet-architecture]
   and [I-D.bas-usecase-detnet] separately.



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   The proposed network architecture is mainly applied to industrial
   production environment, which has strong demands on packet loss
   ratio of network data, low jitter and determinacy and so on. The
   backhaul network is a heterogeneous network including field wireless
   networks and wired networks. Industrial backhaul network contains a
   centralized controller, thus it can schedule the network resources
   of bandwidth and cache. However, some industrial field networks such
   as ISA100.11a, WirelessHART, have their own system manager and
   management mode. At the same time, there is no system manager for
   some types of networks. Thus, it is an issue remained to study about
   how to implement a joint scheduling under a complex industrial
   networks environment.

2. Network Structure

   Figure 1 shows a typical deterministic industrial field/backhaul
   networks structure. The field network is ISA100.11a, which is a
   standard of international industrial wireless network. ISA100.11a
   employs Time Division Multiple Access (TDMA) mechanism to realize
   the network time-slot, and provide a deterministic guarantee for
   sensor data. Data derived from the field networks is access to
   industrial backhaul networks. In the last, sensor data either
   transmits to another industrial field networks, or to the internet
   applications or the enterprise information management system like
   MES/ERP.























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   +------------------------+

   |   ISA100.11a field     |

   |   wireless network     | ------------+

   +------------------------+             |

                              +---------------------+    +-----------+

                              | Industrial backhaul |    |Internet or|

                              |       network       | ---|  MES/ERP  |

                              +---------------------+    +-----------+

   +------------------------+             |

   |   ISA100.11a field     | ------------+

   |   wireless network     |

   +------------------------+

                    Figure 1. Typical network structure

   Thus, in the above network structure, field network nodes deployed
   in a plant can communicate with the field network nodes deployed in
   another plant through the industrial backhaul network. At the same
   time, the internet or information management system can manage the
   sensor nodes of the field network remotely through the industrial
   backhaul network.

3. Joint Scheduling Requirements

3.1. Determinacy

   The data, which generates from industrial field network, is directly
   used to monitor industrial production process, so the requirement of
   data deterministic transmission is very significant, and data needs
   to arrive at its destination in a certain time. Industrial
   field/backhaul network is also a kind of network that is mainly used
   in the process of industrial production, so it also requires to meet
   the demands of data determinism in the joint scheduling.





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3.2. Time Synchronization

   Because the industrial field/backhaul network is a data aggregation
   network, and needs scheduling method to ensure deterministic
   transmission for data stream. Thus, industrial field/backhaul
   network requires high time synchronization accuracy among all
   network devices. The accuracy of time synchronization should be held
   from the range of 10ns to 10ms according to different network
   applications. Presently, the existing time synchronization protocols
   include IEEE 1588 and IEEE 802.1 AS, which are raised by Time
   Sensitive Networking (TSN) Task Group.

3.3. Compatibility

   Industrial field network and backhaul network both comprise
   different types of networks. Industrial field networks such as
   ISA100.11a, WirelessHART usually contains built-in system management,
   which can allocate network communication resources to data stream,
   while some field networks have no system manager. Although
   industrial backhaul network is able to control the network with
   central controller, some mechanisms and interfaces are necessary
   when conducting joint scheduling to keep compatibility with
   industrial field/backhaul network.

3.4. Scalability

   Generally, the field network data cannot be transmitted across
   network. While in the deterministic industrial field/backhaul
   network, the characteristic of cross-networks should be supported.
   Therefore, the scalability of data transmission should be ensured
   during joint scheduling process.

3.5. Scheduling Cost

   The joint scheduling of industrial field/backhaul networks refers to
   different networks, when the network manager calculates the
   scheduling results, it should satisfy a low scheduling cost, such as
   low computation time, and otherwise it will bring extra delay to the
   transmission of data stream.

3.6. Unified Management

   Most industrial wireless networks have their own network manager.
   Network manager is able to configure the time slots and channels of
   field networks. Meanwhile, some backhaul networks also have their
   independent management units and protocols. For hybrid industrial
   field/backhaul networks, data stream usually departs from a filed


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   network, and arrives at another field network by passing through
   backhaul network. It is an important issue to realize the unified
   management of cross-network data stream in multiple heterogeneous
   networks by combining every separate network manager.

4. Security Considerations

5. IANA Considerations

   This memo includes no request to IANA.

6. References

6.1. Normative References

6.2. Informative References

[IEC62734]
           ISA/IEC, "ISA100.11a, Wireless Systems for Automation,
           also IEC 62734", 2011, <http://www.isa100wci.org/enUS/
           Documents/PDF/3405-ISA100-WirelessSystems-Future-brochWEB-
           ETSI.aspx>.

[IEC62591]
           www.hartcomm.org, "Industrial Communication Networks -
           Wireless Communication Network and Communication Profiles
           - WirelessHART - IEC 62591", 2010,<
           <https://webstore.iec.ch/p-
           preview/info_iec62591%7Bed1.0%7Den.pdf>

[IEC62601]
           IEC, "Industrial networks - Wireless communication network
           and communication profiles - WIA-PA - IEC 62601", 2015,
           <https://webstore.iec.ch/preview/info_iec62601%7Bed2.0%7Db
           .pdf>

[I-D.finn-detnet-problem-statement]
           Finn, N. and P. Thubert, "Deterministic Networking Problem
           Statement", draft-finn-detnet-problem-statement-05 (work in
           progress), March 2016.

[I-D.finn-detnet-architecture]
           Finn, N., Thubert, P., and M. Teener, "Deterministic
           Networking Architecture", draft-finn-detnet-architecture-08
           (work in progress), August 2016.




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[I-D.bas-usecase-detnet]
           Kaneko, Y., Toshiba and Das, S, "Building Automation Use
           Cases and Requirements for Deterministic Networking", draft-
           bas-usecase-detnet-00 (work in progress), October 2015.

[IEEE802.1AS-2011]
           IEEE, "Timing and Synchronizations (IEEE 802.1AS-2011)",
           2011, <http://standards.ieee.org/findstds/standard/802.1AS-
           2011.html>.



Authors' Addresses

   Heng Wang
   Chongqing University of Posts and Telecommunications
   2 Chongwen Road
   Chongqing, 400065
   China

   Phone: (86)-23-6248-7845
   Email: wangheng@cqupt.edu.cn


   Ping Wang
   Chongqing University of Posts and Telecommunications
   2 Chongwen Road
   Chongqing, 400065
   China

   Phone: (86)-23-6246-1061
   Email: wangping@cqupt.edu.cn


   Hang Yang
   Chongqing University of Posts and Telecommunications
   2 Chongwen Road
   Chongqing, 400065
   China

   Phone: (86)-23-6246-1061
   Email: 18716322620@163.com







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