Joint Deterministic Scheduling Requirements for Industrial Field/Backhaul Networks
draft-wang-detnet-backhaul-requirements-02
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| Last updated | 2017-11-11 (Latest revision 2017-05-11) | ||
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draft-wang-detnet-backhaul-requirements-02
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.
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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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