Internet DRAFT - draft-wang-detnet-backhaul-requirements
draft-wang-detnet-backhaul-requirements
DetNet H. Wang
Internet Draft P. Wang
Intended status: Standards Track H. Yang
Expires: November 15, 2018 Chongqing University of
Posts and Telecommunications
May 14, 2018
Joint Deterministic Scheduling Requirements for Industrial
Field/Backhaul Networks
draft-wang-detnet-backhaul-requirements-03
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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or obsoleted by other documents
at any time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on November 15, 2018.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Wang, et al. Expires November 15, 2018 [Page 1]
Internet-Draft DetNet Backhaul Requirements May 2018
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in
Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License.
Table of Contents
1. Introduction ................................................ 2
2. Network Structure ........................................... 3
3. Joint Scheduling Requirements ............................... 4
3.1. Determinacy ............................................ 4
3.2. Time Synchronization ................................... 4
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.
Wang, et al. Expires November 15, 2018 [Page 2]
Internet-Draft DetNet Backhaul Requirements May 2018
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.
Wang, et al. Expires November 15, 2018 [Page 3]
Internet-Draft DetNet Backhaul Requirements May 2018
+------------------------+
| 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. Meanwhile,
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 a joint network consisting of multiple
industrial field networks and backhaul networks, so it also requires
to meet the demands of deterministic transmission of the industrial
field network data in the joint scheduling.
Wang, et al. Expires November 15, 2018 [Page 4]
Internet-Draft DetNet Backhaul Requirements May 2018
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, 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.
But to achieve unified management of the industrial field network by
the 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 the backhaul network should be
supported to ensure that different types of industrial field network
data can be transmitted in the backhaul network.
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. Meanwhile, lower CPU load and memory
footprint can make joint scheduling with better cross-platform
compatibility.
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
Wang, et al. Expires November 15, 2018 [Page 5]
Internet-Draft DetNet Backhaul Requirements May 2018
independent management units and protocols. For hybrid industrial
field/backhaul networks, all industrial field network data are
transmitted through the backhaul network.Therefore, 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.
Wang, et al. Expires November 15, 2018 [Page 6]
Internet-Draft DetNet Backhaul Requirements May 2018
[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
Wang, et al. Expires November 15, 2018 [Page 7]
