ETSI TS 103 745 V1.1.1 (2025-04)

TECHNICAL SPECIFICATION
Requirements for the shared use of spectrum between
Urban Rail and Road Intelligent Transport Systems (ITS)
operating in the 5 875 MHz to 5 925 MHz frequency range

2 ETSI TS 103 745 V1.1.1 (2025-04)

Reference
DTS/RT-JTFIR-10
Keywords
ITS, railways
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ETSI
3 ETSI TS 103 745 V1.1.1 (2025-04)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definition of terms, symbols and abbreviations . 7
3.1 Terms . 7
3.2 Symbols . 7
3.3 Abbreviations . 7
4 General overview . 8
5 Use of Band U . 8
5.1 RMO Service description . 8
5.2 Structure and content of the RMO Service. . 9
5.3 Requirements . 10
5.4 Application Programming Interface . 11
5.5 Restricted Modes of Operation applicable to RITS-Ss . 11
5.5.1 Description . 11
5.5.2 Class noTx(0). 11
5.5.3 Class eirp(1) . 12
5.5.4 Class allowedOnPeriods(2) . 12
6 Use of Band R . 12
Annex A (normative): ASN.1 Modules . 13
Annex B (informative): Description of structures of RMO zone and RMO region . 14
B.1 Example of the content of the structures . 14
B.2 Use of activation date in RMO zones . 16
Annex C (informative): Guidelines on the implementation of the map server . 18
C.1 URL of the map server . 18
C.2 Responsibilities amongst stakeholders and link to the regulatory framework . 18
History . 19

ETSI
4 ETSI TS 103 745 V1.1.1 (2025-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI IPR online database.
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
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Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Railway Telecommunications
(RT).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
In accordance with the regulation laid-out in EC Decision 2020/1426 [i.1], the frequency band 5 875 - 5 935 MHz is
designated for intelligent transport systems on a on a non-exclusive basis and the frequency band 5 925 - 5 935 MHz is
limited to Urban Rail ITS. Road ITS has priority in the frequency range 5 875 - 5 915 MHz denoted "Band R", while
Urban Rail ITS has priority in the frequency range 5 915 - 5 925 MHz band denoted "Band U".
Protection is afforded to applications running on ITS-Ss that have priority. In the context of the present document,
protection/priority of an application is interpreted to mean preservation of the application's proper functioning and
availability while sharing the radio resources with other applications.
The present document is the output of the joint effort by the Urban Rail and Road ITS communities to develop sharing
solutions for Band U and to address the use of Band R. The objective of the sharing solutions is to enable the shared use
of Band U and Band R by both Urban Rail and Road ITS while respecting the priority assigned to each band. The
prioritization of the ITS spectrum is summarized in Figure 1.
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5 ETSI TS 103 745 V1.1.1 (2025-04)
The present document takes into account the investigations of ETSI TR 103 580 [i.2].
5875 5885 5895 5905 5915 5925 5935
BAND R BAND U
Urban
Road ITS Urban Rail ITS Rail ITS
(+ Urban Rail ITS)
(+ Road Rail ITS)
Figure 1: Frequency bands designated for Road ITS and Urban Rail ITS applications
In Figure 1, the system highlighted in bold has priority over the system in italics.

ETSI
6 ETSI TS 103 745 V1.1.1 (2025-04)
1 Scope
The present document specifies sharing solutions for use of the frequency band 5 915 - 5 925 MHz (Band U) by Urban
Rail and Road ITS considering that Urban Rail has priority in that band. In addition, it addresses the shared use of the
band 5 875 - 5 915 MHz (Band R) by Urban Rail ITS, where Road ITS has priority.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 103 097 (V2.1.1) (2021-10): "Intelligent Transport Systems (ITS); Security; Security
header and certificate formats; Release 2".
[2] ETSI TS 102 894-2: "Intelligent Transport Systems (ITS); Users and applications requirements;
Part 2: Applications and facilities layer common data dictionary; Release 2".
[3] ETSI TS 102 965 (V2.3.1): "Intelligent Transport Systems (ITS); Application Object Identifier
(ITS-AID); Registration; Release 2".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] Commission Implementing Decision (EU) 2020/1426 of 7 October 2020 on the harmonised use of
radio spectrum in the 5 875-5 935 MHz frequency band for safety-related applications of
intelligent transport systems (ITS) and repealing Decision 2008/671/EC.
[i.2] ETSI TR 103 580: "Urban Rail ITS and Road ITS applications in the 5,9 GHz band; Investigations
for the shared use of spectrum".
[i.3] Directive 2010/40/EU of the European Parliament and of the Council of 7 July 2010 on the
framework for the deployment of Intelligent Transport Systems in the field of road transport and
for interfaces with other modes of transport.
[i.4] ETSI TS 103 724: "Intelligent Transport Systems (ITS); Facilities layer function; Interference
Management Zone Message (IMZM); Release 2".
[i.5] ECC Decision (08)01: "The harmonised use of Safety-Related Intelligent Transport Systems (ITS)
th
in the 5875-5935 MHz frequency band", 14 March 2008 (amended on March 7 2025).
ETSI
7 ETSI TS 103 745 V1.1.1 (2025-04)
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
Band R: frequency band 5 875 - 5 915 MHz
Band U: frequency band 5 915 - 5 925 MHz
Restricted Modes of Operation (RMO): set of operational constraints that may be imposed on a specified set of
devices under certain conditions
RMO map: data collection containing all RMO zones applicable to a given sharing situation at a given time
RMO region: geographic region in which one or more RMOs are imposed
RMO zone: component of an RMO map that contains a geographic region (RMO Region), a set of applicable RMOs
and other relevant data as specified in clause 5
Road ITS Station (RITS-S): radio station used for intelligent transport systems applied to any kind of road-based
transport that enable safety communications between vehicles, and between infrastructure and vehicles and allowed to
operate in the frequency band 5 875 - 5 925 MHz by the regulation
NOTE: These include Vehicle ITS station Units (V-ITS-SUs), Roadside units (RSUs), Personal ITS station Units
(P-ITS-SUs), and others.
sharing situation: situation in which non-interoperable devices share a common frequency band
NOTE: The use by Road ITS-Ss and Urban Rail ITS-Ss of the frequency band 5 875 - 5 925 MHz in the
European Union is a sharing situation.
Urban Rail ITS Equipment (URITS-E): radio station used for intelligent transport systems applied to urban or
suburban railway lines permanently guided by at least one control and management system, separated from road and
pedestrian traffic and allowed by regulation to operate in the band 5 875 - 5 935 MHz.
NOTE 1: These include Communications-Based Train Control (CBTC) Base Stations installed along the tracks
(CBTC BS) as well as CBTC train On Board Units (OBU).
NOTE 2: In the context of the present document, the term "Urban Rail ITS" refers to the terminology used in
Commission Implementing Decision (EU) 2020/1426 [i.1] and does not refer to ITS stations as referred to
in Directive 2010/40/EU [i.3].
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
API Application Programming Interface
ASN.1 Abstract Syntax Notation One
CBTC BS Communications-Based Train Control Base Station
CBTC Communication Based Train Control
C-ITS Cooperative Intelligent Transport Systems
EIRP Equivalent Isotropic Radiated Power
EU-CCMS European Union C-ITS Security Credential Management System
HTTP HyperText Transfer Protocol
IAT International Atomic Time
ITS Intelligent Transport Systems
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8 ETSI TS 103 745 V1.1.1 (2025-04)
OBU On Board Unit
OEM Original Equipment Manufacturer
RITS-S Road ITS Station
RMO Restricted Mode of Operation
RSU RoadSide Unit
URITS-E Urban Rail ITS Equipment
URL Uniform Resource Locator
V-ITS-SU Vehicle ITS Station Unit
WGS 84 World Geodetic System 1984
4 General overview
Existing CBTC systems operate in the frequency band 5 915 - 5 935 MHz. RITS-Ss operate in the 5 875 - 5 915 MHz
band (Band R) and more spectrum is likely to be necessary in the future to enable all the envisaged services. To address
this issue, the Commission made the decision to allow Road ITS use of the 5 915 - 5 925 MHz band (Band U) under the
condition that Urban Rail would have "priority" in that band. Urban Rail was also allowed to use the Road ITS band
5 875 - 5 915 MHz (Band R) under the condition that Road ITS would have "priority" in that band (see Commission
Implementing Decision (EU) 2020/1426 [i.1] and Figure 1).
For the use of Band U by RITS-Ss, a number of possible sharing solutions were investigated and the concept of a "map
server" was introduced (see ETSI TR 103 580 [i.2]).
Clauses 5 of the present document specifies a solution based on a map server, which consists of a data repository
containing geographic regions of Restricted Modes of Operations (RMOs) made available to all RITS-Ss that intend to
use Band U. In more detail:
• Clause 5.1 describes the service which enables the use of Band U by Road ITS.
• Clause 5.2 defines the data structures involved in the service.
• Clause 5.3 defines the requirements.
• Clause 5.4 describes the Application Programming Interface that is used for downloading the data from the
map server.
• Clause 5.5 specifies classes of restricted modes of operation that may be imposed on devices in a specified
frequency band and a specified geographic region.
5 Use of Band U
5.1 RMO Service description
The RMO Service enables (possibly non-interoperable) devices to use a given frequency band under conditions that
respect the devices that have priority in that frequency band.
In particular, this service is designed to enable use of Band U by RITS-Ss while avoiding interference to URITS-Es
operating in that band.
The RMO service is based on dissemination of restrictions that apply to a class of devices from a server (RMO map
server). An RMO map server is the repository for an RMO map dataset that contains RMO zones that in turn contain
geographic regions of Restricted Modes of Operation (RMO regions) with associated Restricted Modes of Operation
(RMOs). RITS-Ss located in an RMO region and operating in Band U should apply the corresponding RMOs.
The RMO map server or a proxy may be queried directly by the devices intending to use shared band, or the RMO map
dataset may be relayed by intermediate servers, such as OEM's backend infrastructures.
The present document contains the data objects (in ASN.1) necessary to:
1) define geographic regions unambiguously;
ETSI
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