Telecommunications and information exchange between information technology systems — Requirements for local and metropolitan area networks — Part 1CM: Time-sensitive networking for fronthaul

This standard defines profiles that select features, options, configurations, defaults, protocols and procedures of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul streams, which are time-sensitive. NOTE—Stream and flow are used as synonyms in this document.1

Télécommunications et échange entre systèmes informatiques — Exigences pour les réseaux locaux et métropolitains — Partie 1CM: Réseaux à temps critique pour fronthaul

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Status
Published
Publication Date
30-Jul-2019
Current Stage
6060 - International Standard published
Due Date
24-Feb-2020
Completion Date
31-Jul-2019
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INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1CM
First edition
2019-07
Telecommunications and information
exchange between information
technology systems — Requirements
for local and metropolitan area
networks —
Part 1CM:
Time-sensitive networking for
fronthaul
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1CM: Réseaux à temps critique pour fronthaul
Reference number
ISO/IEC/IEEE 8802-1CM:2019(E)
©
IEEE 2018

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ISO/IEC/IEEE 8802-1CM:2019(E)

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ISO/IEC/IEEE 8802-1CM:2019(E)
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iii

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IEEE Std 802.1CM™-2018
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 7 May 2018
IEEE-SA Standards Board

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ISO/IEC/IEEE 8802-1CM:2019(E)
Abstract: This standard defines profiles that select features, options, configurations, defaults,
protocols, and procedures of bridges, stations, and LANs that are necessary to build networks that
are capable of transporting fronthaul streams, which are time sensitive.

Keywords: bridged network, fronthaul, IEEE 802 , IEEE 802.1™, IEEE802.1CM™,
synchronization, time-sensitive networking, TSN, Virtual Local Area Network, VLAN, VLAN Bridge
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Print: ISBN 978-1-5044-4909-0 STD23131
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ISO/IEC/IEEE 8802-1CM:2019(E)
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ISO/IEC/IEEE 8802-1CM:2019(E)
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ISO/IEC/IEEE 8802-1CM:2019(E)
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ISO/IEC/IEEE 8802-1CM:2019(E)
Participants
At the time of approval of this standard, the IEEE 802.1 Working Group had the following membership:
Glenn Parsons, Chair
John Messenger, Vice Chair
János Farkas, Chair, Time-Sensitive Networking Task Group, Editor
Ralf Assmann Marina Gutiérrez Karen Randall
Shenghua Bao Stephen Haddock
Maximilian Riegel
Gordon Bechtel Mark Hantel Jessy V. Rouyer
Jens Bierschenk Marc Holness Soheil Samii
Steinar Bjørnstad Lokesh Kabra Atsushi Sato
Christian Boiger Michael Karl Frank Schewe
Paul Bottorff Stephan Kehrer Michael Seaman
Radhakrishna Canchi Hajime Koto Johannes Specht
David Chen
Yizhou Li Patricia Thaler
Feng Chen Christophe Mangin Paul Unbehagen
Weiying Cheng Scott Mansfield Hao Wang
Paul Congdon James McIntosh Tongtong Wang
Rodney Cummings Robert Moskowitz Xinyuan Wang
Hesham ElBakoury Tero Mustala Karl Weber
Norman Finn Tomoki Ohsawa Brian Weis
Mickaël Fontaine
Donald R. Pannell Jordon Woods
Geoffrey Garner Takahiro Yamaura
Walter Pienciak
Eric W. Gray Michael Potts Xiang Yu
Craig Gunther Wei Qiu Nader Zein
The following members of the individual balloting committee voted on this standard. Balloters may have
voted for approval, disapproval, or abstention.
Thomas Alexander Stephen Haddock Glenn Parsons
Butch Anton Marco Hernandez Bansi Patel
Werner Hoelzl
Stefan Aust Clinton Powell
Gordon Bechtel Noriyuki Ikeuchi Alon Regev
Harry Bims Atsushi Ito Maximilian Riegel
Steinar Bjørnstad Raj Jain Robert Robinson
Christian Boiger SangKwon Jeong Jessy V. Rouyer
Piotr Karocki
Demetrio Bucaneg, Jr. Peter Saunderson
William Byrd Stuart Kerry Michael Seaman
Juan Carreon Yongbum Kim Thomas Starai
Keith Chow Mark Laubach Walter Struppler
Todor Cooklev Han Hyub Lee Bo Sun
Rodney Cummings Hyeong Ho Lee Richard Tse
Lars Ellegaard John Lemon Mark-Rene Uchida
Marc Emmelmann Michael Lynch Dmitri Varsanofiev
Yonggang Fang Elvis Maculuba Kari Vierimaa
János Farkas Richard Maiden George Vlantis
Norman Finn Khurram Waheed
Roger Marks
Avraham Freedman John Messenger Lisa Ward
Matthias Fritsche Michael Montemurro Hung-Yu Wei
Yukihiro Fujimoto Nick S. A. Nikjoo Andreas Wolf
Devon Gayle Satoshi Obara Oren Yuen
Eric W. Gray Nader Zein
Robert O’Hara
Randall Groves Zhen Zhou
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ISO/IEC/IEEE 8802-1CM:2019(E)
When the IEEE-SA Standards Board approved this standard on 7 May 2018, it had the following
membership:
Jean-Philippe Faure, Chair
Gary Hoffman, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Chuck Adams Thomas Koshy Robby Robson
Masayuki Ariyoshi Joseph L. Koepfinger* Dorothy Stanley
Adrian Stephens
Ted Burse Kevin Lu
Mehmet Ulema
Stephen Dukes Daleep Mohla
Phil Wennblom
Doug Edwards Damir Novosel
Ronald C. Petersen Howard Wolfman
J. Travis Griffith
Annette D. Reilly Yu Yuan
Michael Janezic
*Member Emeritus
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ISO/IEC/IEEE 8802-1CM:2019(E)
Introduction
This introduction is not part of IEEE Std 802.1CM-2018, IEEE Standard for Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul.
This standard defines profiles that select features, options, configurations, defaults, protocols and procedures
of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul
streams, which are time-sensitive.
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ISO/IEC/IEEE 8802-1CM:2019(E)
Contents
1. Overview . 10
1.1 Scope. 10
1.2 Purpose. 10
1.3 Introduction. 10
2. Normative references . 12
3. Definitions . 13
4. Acronyms and abbreviations . 14
5. Conformance . 16
5.1 Requirements terminology. 16
5.2 Profile Conformance Statement (PCS) . 16
5.3 Bridge requirements. 16
5.4 Bridge options. 17
5.5 End station requirements . 18
5.6 End station options. 18
6. Fronthaul . 20
6.1 Evolved Universal Terrestrial Radio Access background . 21
6.2 Class 1 requirements. 21
6.3 Class 2 requirements. 23
6.4 Synchronization requirements . 26
7. Bridge and synchronization functions . 31
7.1 Latency components . 31
7.2 Bridge delay calculation . 31
7.3 Frame preemption . 33
7.4 Network synchronization. 33
7.5 Flow control. 37
7.6 Energy Efficient Ethernet . 37
8. Fronthaul profiles . 39
8.1 Profile A. 40
8.2 Profile B. 42
9. Synchronization solutions . 44
9.1 Solution for Category A+ . 44
9.2 Solutions for Category A . 44
9.3 Solutions for Category B . 44
9.4 Solutions for Category C . 44
Annex A (normative) PCS proforma—Time-Sensitive Networking for Fronthaul Profiles. 45
Annex B (informative) Delay calculation examples. 55
Annex C (informative) Bibliography. 59
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ISO/IEC/IEEE 8802-1CM:2019(E)
IEEE Std 802.1CM-2018
IEEE Standard for Local and metropolitan area networks—Time-Sensitive Networking for Fronthaul
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
1. Overview
1.1 Scope
This standard defines profiles that select features, options, configurations, defaults, protocols and procedures
of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul
streams, which are time-sensitive.
1
NOTE—Stream and flow are used as synonyms in this document.
1.2 Purpose
The purpose of this standard is to specify defaults and profiles that enable the transport of time-sensitive
fronthaul streams in Ethernet bridged networks.
1.3 Introduction
Fronthaul provides connectivity between functional blocks of a cellular base station (BS). The fronthaul
flows between these functional blocks have stringent quality of service requirements. The successful support
of fronthaul flows in a bridged network requires the selection of specific features and options that are

specified in a number of different standards, some developed by IEEE Project 802 , and others (in
particular, those that relate to functionality in OSI layer 3 and above; ISO/IEC 7498:1994 [B11]) developed
2
by other standards organizations.
This standard selects features and options that support OSI layers 1 and 2 in bridges and end stations from
the following specifications:
3
— Virtual Local Area Network (VLAN) Bridge specification in IEEE Std 802.1Q.
— MAC service specifications in IEEE Std 802.1AC.
1
Notes in text, tables, and figures of a standard are given for information only and do not contain requirements needed to implement this
standard.
2
The numbers in brackets correspond to those of the bibliography in Annex C
3
Information on references can be found in Clause 2.
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ISO/IEC/IEEE 8802-1CM:2019(E)
IEEE Std 802.1CM-2018
IEEE Standard for Local and metropolitan area networks—Time-Sensitive Networking for Fronthaul
— MAC/PHY technology specifications in IEEE Std 802.3.
— Interspersing express traffic specification in IEEE Std 802.3br.
— Frame preemption specification in IEEE Std 802.1Q.
— Time synchronization and Precision Time Protocol (PTP) specifications in IEEE Std 1588.
— Telecom profile specification in ITU-T G.8275.1, which is based on IEEE Std 1588.
— Synchronous Ethernet specification in ITU-T G.8261, G.8262, and G.8264.
To specify and explain the selection of features and options, this standard:
a) Describes fronthaul requirements (Clause 6), specifying two classes of requirements (6.2, 6.3) that
depend on the BS functional decomposition, and specifying synchronization requirements (6.4) that
apply to both classes.
b) Describes how the operation of bridges and bridged networks affects the quality of service provided
by the fronthaul bridged network (Clause 7), providing details to assist in the calculation of latency
(7.1, 7.2, 7.3), the selection of network synchronization methods (7.4), and the potential impact of
the use of flow control (7.5) and Energy Efficient Ethernet (EEE, 7.6).
c) Specifies two bridge profiles (Clause 8) that support the construction of bridged networks meeting
fronthaul requirements. Profile A (8.1) is applicable to bridges that do not support frame preemption
(7.3), while Profile B (8.2) involves frame preemption
...

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