Intelligent Transport Systems (ITS) - Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band

The scope of the present document is to define the two lowest layers, physical layer and the data link layer, grouped into the access layer of the ITS station reference architecture EN 302 665 [i.8]. The access layer technology that is specified in the present document is collectively called ITS-G5. It is part of the communication stack supporting data exchange between mobile stations without prior network set-up, i.e. ad hoc mode, for the following frequency bands in Europe:
- ITS-G5A: Operation of ITS-G5 in European ITS frequency bands dedicated to ITS for safety related applications in the frequency range 5,875 GHz to 5,905 GHz.
-ITS-G5B: Operation in European ITS frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to 5,875 GHz.
- ITS-G5D: Operation of ITS applications in the frequency range 5,905 GHz to 5,925 GHz.
The ITS-G5 technology is based on IEEE 802.11-2012 [3] and IEEE/ISO/IEC 8802-2-1998 [5]. By setting the MIB variable dot11OCBActivated to true in IEEE 802.11-2012 [3] communication outside the context of a BSS is possible. This type of communication allows for immediate exchange of data frames, avoiding the management overhead used with the establishment of a network. All requirements in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" are also requirements in the present document. All optional functionality in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" is also optional in the present document.

Inteligentni transportni sistemi (ITS) - Specifikacija dostopovne plasti pri inteligentnih transportnih sistemih, ki delujejo v frekvenčnem pasu 5 GHz

Področje uporabe tega dokumenta je določanje dveh najnižjih plasti, fizične plasti in plasti podatkovnih povezav, združenih v dostopovni plasti referenčne arhitekture postaje ITS EN 302 665 [i.8]. Tehnologija dostopovne plasti, ki je določena v tem dokumentu, ima skupno ime ITS-G5. Ta tehnologija je del komunikacijskega sklada, ki podpira izmenjavo podatkov med mobilnimi postajami brez predhodno nastavljenega omrežja, tj. ad hoc način, in sicer za naslednje frekvenčne pasove v Evropi:
– ITS-G5A: delovanje ITS-G5 v evropskih frekvenčnih pasovih ITS, namenjenih za ITS, in sicer za uporabe, povezane z varnostjo, v frekvenčnem območju od 5,875 do 5,905 GHz.
–ITS-G5B: delovanje v evropskih frekvenčnih pasovih ITS, namenjenih za ITS, in sicer za uporabe, ki niso povezane z varnostjo, v frekvenčnem območju od 5,855 do 5,875 GHz.
– ITS-G5D: delovanje uporab ITS v frekvenčnem območju od 5,905 do 5,925 GHz.
Tehnologija ITS-G5 temelji na standardih IEEE 802.11-2012 [3] in IEEE/ISO/IEC 8802-2-1998 [5]. Z nastavitvijo spremenljivke MIB »dot11OCBActivated« na vrednost »true« v IEEE 802.11-2012 [3] se omogoči komunikacija zunaj konteksta BSS. Ta vrsta komunikacije omogoča takojšnjo izmenjavo podatkovnih okvirjev in izogibanje splošnemu upravljanju, ki je potrebno pri vzpostavitvi omrežja. Vse zahteve iz standarda IEEE 802.11-2012 [3], povezane s komunikacijo »zunaj konteksta BSS«, so tudi zahteve tega dokumenta. Vse izbirne funkcije iz standarda IEEE 802.11-2012 [3], povezane s komunikacijo »zunaj konteksta BSS«, so izbirne tudi v tem dokumentu.

General Information

Status
Published
Public Enquiry End Date
28-Feb-2013
Publication Date
23-Sep-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Sep-2013
Due Date
21-Nov-2013
Completion Date
24-Sep-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Intelligent Transport Systems (ITS) - Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band35.240.60Uporabniške rešitve IT v transportu in trgoviniIT applications in transport and tradeICS:Ta slovenski standard je istoveten z:EN 302 663 Version 1.2.1SIST EN 302 663 V1.2.1:2013en01-oktober-2013SIST EN 302 663 V1.2.1:2013SLOVENSKI

STANDARD
SIST EN 302 663 V1.2.1:2013

ETSI EN 302 663 V1.2.1 (2013-07) Intelligent Transport Systems (ITS); Access layer specification for

Intelligent Transport Systems operating in the 5 GHz frequency band
European Standard SIST EN 302 663 V1.2.1:2013
ETSI ETSI EN 302 663 V1.2.1 (2013-07) 2

Reference REN/ITS-0040028 Keywords ITS, layer 1, layer 2, MAC, profile, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88

Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2013. All rights reserved.

DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 3 Contents Intellectual Property Rights ................................................................................................................................ 4 Foreword ............................................................................................................................................................. 4 Introduction ........................................................................................................................................................ 4 1 Scope ........................................................................................................................................................ 5 2 References ................................................................................................................................................ 5 2.1 Normative references ......................................................................................................................................... 5 2.2 Informative references ........................................................................................................................................ 6 3 Definitions, symbols and abbreviations ................................................................................................... 7 3.1 Definitions .......................................................................................................................................................... 7 3.2 Symbols .............................................................................................................................................................. 7 3.3 Abbreviations ..................................................................................................................................................... 7 4 General requirements ............................................................................................................................... 8 4.1 Architecture ........................................................................................................................................................ 8 4.2 Frequency allocation ........................................................................................................................................ 10 4.2.1 Introduction................................................................................................................................................. 10 4.2.2 ITS-G5A frequency band ............................................................................................................................ 10 4.2.3 ITS-G5B frequency band ............................................................................................................................ 10 4.2.4 ITS-G5C frequency band ............................................................................................................................ 11 4.2.5 ITS-G5D frequency band ............................................................................................................................ 11 4.3 Channel allocation ............................................................................................................................................ 11 4.4 Transmit requirements ...................................................................................................................................... 12 4.5 Receive requirements ....................................................................................................................................... 12 4.6 Quality of service ............................................................................................................................................. 12 5 ITS-G5 Access layer .............................................................................................................................. 12 5.1 Decentralized Congestion Control ................................................................................................................... 12 5.2 Coexistence between CEN DSRC and ITS-G5 ................................................................................................ 12 6 Conformance and test methods .............................................................................................................. 13 Annex A (normative): MIB parameter .............................................................................................. 14 Annex B (informative): Introduction to IEEE 802.11-2012 [3] .......................................................... 15 B.1 Introduction ............................................................................................................................................ 15 B.2 Network topology ................................................................................................................................... 16 B.3 Physical layer ......................................................................................................................................... 16 B.4 Medium access control ........................................................................................................................... 17 B.4.1 Introduction ...................................................................................................................................................... 17 B.4.2 Backoff procedure ............................................................................................................................................ 18 B.4.3 Medium access control ..................................................................................................................................... 18 B.4.4 EDCA parameters, AC and UP ........................................................................................................................ 19 B.5 Implications of the dot11OCBActivated set to true ............................................................................... 21 Annex C (informative): ITS-G5C frequency band .............................................................................. 22 Annex D (informative): Bibliography ................................................................................................... 23 History .............................................................................................................................................................. 24

SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is 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 Web server (http://ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, 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. Foreword This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS).

National transposition dates Date of adoption of this EN: 2 July 2013 Date of latest announcement of this EN (doa): 31 October 2013 Date of latest publication of new National Standard or endorsement of this EN (dop/e):

30 April 2014 Date of withdrawal of any conflicting National Standard (dow): 30 April 2014

Introduction The present document is outlining the two lowest layers - physical layer and data link layer - in the protocol stack for supporting vehicle-to-vehicle communications in an ad hoc network to be used at the 5,9 GHz frequency band allocated in Europe. The two lowest layers are termed access layer in the present document and the technology specified for the access layer is collectively called ITS-G5. The ITS-G5 standard is using already existing standards for communications. The data link layer is divided into two sublayers; medium access control and logical link control. The physical layer and the medium access control layer are covered in IEEE 802.11-2012 [3]. The logical link control is based on the IEEE/ISO/IEC 8802-2-1998 [5]. The ITS-G5 standard also adds features for decentralized congestion control (DCC) methods TS 102 687 [8] to control the network load and avoid unstable behaviour. By setting the management information base (MIB) parameter dot11OCBActivated to true in IEEE 802.11-2012 [3] a new capability is introduced namely the possibility to communicate outside the context of a basic service set (BSS), which is the smallest building block of a 802.11 network. Communication outside the BSS implies that neither authentication/association procedures nor security mechanisms are supported. Further, no access point functionality is present. The disable of these features also affects other built-in features of IEEE 802.11-2012 [3]. The requirement that nodes should share a common clock is no longer valid while dot11OCBActivated is true. Further, scanning of available frequency channels for joining a BSS is also disabled implying that communication outside the context of the BSS requires that a node is configured for a predetermined frequency channel where more information about other available frequency channels can be obtained.

NOTE: IEEE has compiled a new version of the 802.11 standard where all approved amendments produced between 2007 and 2011 have been enrolled in the base standard including 802.11p. This new version called IEEE 802.11-2012 [3] was approved in March 2012. Due to this new version of 802.11 the 802.11p amendment is classified as superseded.

SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 5 1 Scope The scope of the present document is to define the two lowest layers, physical layer and the data link layer, grouped into the access layer of the ITS station reference architecture EN 302 665 [i.8]. The access layer technology that is specified in the present document is collectively called ITS-G5. It is part of the communication stack supporting data exchange between mobile stations without prior network set-up, i.e. ad hoc mode, for the following frequency bands in Europe: • ITS-G5A: Operation of ITS-G5 in European ITS frequency bands dedicated to ITS for safety related applications in the frequency range 5,875 GHz to 5,905 GHz. • ITS-G5B: Operation in European ITS frequency bands dedicated to ITS non-safety applications in the frequency range 5,855 GHz to 5,875 GHz. • ITS-G5D: Operation of ITS applications in the frequency range 5,905 GHz to 5,925 GHz. The ITS-G5 technology is based on IEEE 802.11-2012 [3] and IEEE/ISO/IEC 8802-2-1998 [5]. By setting the MIB variable dot11OCBActivated to true in IEEE 802.11-2012 [3] communication outside the context of a BSS is possible. This type of communication allows for immediate exchange of data frames, avoiding the management overhead used with the establishment of a network. All requirements in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" are also requirements in the present document. All optional functionality in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" is also optional in the present document. 2 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 reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. [1] ETSI EN 302 571 (V1.1.1): "Intelligent Transport Systems (ITS); Radiocommunications equipment operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive". [2] ETSI TS 102 792 (V1.1.1): "Intelligent Transport Systems (ITS); Mitigation techniques to avoid interference between European CEN Dedicated Short Range Communication (CEN DSRC) equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range". [3] IEEE 802.11-2012: "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications". [4] IEEE 802-2001: "IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture". [5] IEEE/ISO/IEC 8802-2-1998: "Information technology -- Telecommunications and information exchange between systems -- Local and metropolitan area networks -- Specific requirements -- Part 2: Logical Link Control". SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 6 [6] ISO/IEC 7498-1:1994: "Information technology - Open Systems Interconnection - Basic Reference Model: The Basic Model". [7] Recommendation ITU-T X.691 (2008): "Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)". [8] ETSI TS 102 687 (V1.1.1): "Intelligent Transport Systems (ITS); Decentralized Congestion Control Mechanisms for Intelligent Transport Systems operating in the 5 GHz range; Access layer part". 2.2 Informative references 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] ETSI EN 300 674 (all parts): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Road Transport and Traffic Telematics (RTTT); Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and Medical (ISM) band". [i.2] ECC/REC/(08)01: "ECC Recommendation (08)01 on the use of the band 5855-5875 MHz for Intelligent Transport Systems (ITS)". [i.3] ERC/DEC(99)23: "ERC Decision of 29 November 1999 on the harmonised frequency bands to be designated for the introduction of High Performance Radio Local Area Networks (HIPERLANs)". [i.4] ECC/DEC(02)01: "ECC Decision of 15 March 2002 on the frequency bands to be designated for the co-ordinated introduction of Road Transport and Traffic Telematic Systems". [i.5] Commission Decision 2005/513/EC of 11 July 2005 on the harmonised use of radio spectrum in the 5 GHz frequency band for the implementation of wireless access systems including radio local area networks (WAS/RLANs). [i.6] Commission Decision 2007/90/EC of 12 February 2007 amending Decision 2005/513/EC on the harmonised use of radio spectrum in the 5 GHz frequency band for the implementation of Wireless Access Systems including Radio Local Area Networks (WAS/RLANs). [i.7] Commission Decision 2008/671/EC of 5 August 2008 on the harmonised use of radio spectrum in the 5 875-5 905 MHz frequency band for safety-related applications of Intelligent Transport Systems (ITS). [i.8] ETSI EN 302 665 (V1.1.1): "Intelligent Transport Systems (ITS); Communications Architecture". [i.9] ETSI TS 102 724 (V0.0.11): "Intelligent Transport Systems (ITS); Harmonized Channel Specifications for Intelligent Transport Systems operating in the 5 GHz frequency band". [i.10] ANSI/IEEE Std 802.1D 1998: "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Common specifications- Part 3: Media Access Control (MAC) Bridges". [i.11] IEEE 802.11p-2010: "IEEE Standard for Information technology-- Local and metropolitan area networks-- Specific requirements-- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 6: Wireless Access in Vehicular Environments". [i.12] IEEE 802.11a-1999: "IEEE Standard for Telecommunications and Information Exchange Between Systems - LAN/MAN Specific Requirements - Part 11: Wireless Medium Access Control (MAC) and physical layer (PHY) specifications: High Speed Physical Layer in the 5 GHz band". [i.13] IEEE 802.11e-2005: "IEEE Standard for Information technology-- Local and metropolitan area networks-- Specific requirements-- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment: Medium Access Method (MAC) Quality of Service Enhancements". SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 7 [i.14] ETSI EN 301 893 (V1.5.1): "Broadband Radio Access Networks (BRAN); 5 GHz high performance RLAN; Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive". [i.15] ETSI EN 302 502 (V1.2.1): "Broadband Radio Access Networks (BRAN); 5,8 GHz fixed broadband data transmitting systems; Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive". 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in EN 302 571 [1], TS 102 792 [2], IEEE 802.11-2012 [3], IEEE 802-2001 [4], IEEE/ISO/IEC 8802-2-1998 [5], ISO/IEC 7498-1 [6], Recommendation ITU-T X.691 [7] and the following apply: ethertype: identifier to the network protocol above the data link layer ITS-G5: access technology to be used in frequency bands dedicated for European intelligent transport System (ITS) ITS-G5 Control Channel:

physical channel for ITS-G5 ITS-G5 Service Channel:

physical channel for ITS-G5 ITS-G5 Station: ITS station that operates using ITS-G5 channels 3.2 Symbols For the purposes of the present document, the following symbols apply: aCWmax Maximum value of Contention Window aCWmin Minimum value of Contention Window AIFS Arbitration InterFrame Space AIFSN Arbitration InterFrame Space Number aSIFSTime Short InterFrame Space defined by the physical layer aSlotTime A slot time defined by the physical layer CW Contention Window CWmax Maximum value of Contention Window CWmin Minimum value of Contention Window 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Access Category AC_BE Access Category Best Effort AC_BK Access Category Background AC_VI Access Category Video AC_VO Access Category Voice ACK Acknowledgment AIFS Arbitration InterFrame Space AIFSN Arbitration InterFrame Space Number AP Access Point BE Best Effort BK Background BPSK Binary Phase Shift Keying BRAN Broadband Radio Access Network BSS Basic Service Set SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 8 BSSID Basic Service Set Identification CCH Control Channel CEN European Committee for Standardisation CSMA/CA Carrier Sense Multiple Access with Collision Avoidance CW Contention Window DCC Decentralized Congestion Control DCF Distributed Coordination Function DFS Dynamic Frequency Selection DIFS Distributed InterFrame Space DSRC Dedicated Short-Range Communication ECC Electronic Communication Committee EDCA Enhanced Distribution Coordination Access EE Excellent Effort EIRP Effective Isotropic Radiated Power EN European Norm G5-CCH ITS-G5 Control Channel G5-SCH ITS-G5 Service Channel GPS Global Positioning System IBSS Independent Basic Service Set IEEE Institute of Electrical and Electronics Engineers ITS Intelligent Transport System ITS-G5A Frequency band ranging from 5 875 MHz to 5 905 MHz ITS-G5B Frequency band ranging from 5 855 MHz to 5 875 MHz ITS-G5C Frequency band ranging from 5 470 MHz to 5 725 MHz ITS-G5D Frequency band ranging from 5 905 MHz to 5 925 MHz LLC Logical Link Control MAC Medium Access Control MIB Management Information Base MPDU MAC Protocol Data Unit NC Network Control OFDM Orthogonal Frequency Division Multiplexing OSI Open Systems Interconnect PHY Physical layer PLCP Physical Layer Convergence Protocol PPDU PLCP Protocol Data Unit PSDU PLCP Service Data Unit QAM Quadrature Amplitude Modulation QoS Quality of Service QPSK Quadrature Phase Shift Keying RLAN Radio Local Area Network SNAP SubNetwork Access Protocol TPC Transmit Power Control TR Technical Report TS Technical Specification TX Transmitter UP User Priority VI Video VO Voice WLAN Wireless Local Area Network 4 General requirements 4.1 Architecture Figure 1 shows the ITS station reference architecture EN 302 665 [i.8]. The present document specifies one access technology for cooperative ITS namely ITS-G5 based on IEEE 802.11-2012 [3]. The access layer of the ITS station reference architecture includes both the physical layer and the data link layer of the OSI model. SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 9

Figure 1: ITS station reference architecture In Figure 2 the ITS-G5 access layer architecture is outlined. The security entity shown in Figure 1 is included as a part of the management entity EN 302 665 [i.8]. Medium Access Control (MAC) Logical Link Control (LLC) Physical layer

(PHY) ITS-G5 Access layer
IN-SAP MI-SAP

Figure 2: ITS-G5 access layer architecture An ITS-G5 station shall be compliant with the following IEEE standards: 1) The physical (PHY) layer orthogonal frequency division multiplexing (OFDM) as defined in clause 18 of IEEE 802.11-2012 [3]. 2) The medium access control (MAC) layer functionality as defined in IEEE 802.11-2012 [3] by setting the MIB parameter dot11OCBActivated to true enabling communication outside the context of a basic service set (BSS). 3) The logical link control (LLC) as defined in IEEE/ISO/IEC 8802-2-1998 [5] and the mode of operation is set to Type 1 - unacknowledged connectionless mode. 4) The subnetwork access protocol (SNAP) as defined in IEEE 802-2001 [4]. An ITS-G5 station shall comply to the functionality defined in clause 5 ITS-G5 Access layer.

The SNAP provides the possibility to distinguish between different network protocols through EtherTypes.

In annex B an informative introduction to IEEE 802.11-2012 [3], where the MIB parameter dot11OCBActivated is set to true, is given to facilitate the reading of the present document. SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 10 4.2 Frequency allocation 4.2.1 Introduction Table 1 shows the frequency ranges, related regulatory requirements, intended usage and harmonized standards to be used for cooperative ITS within the European Union. Table 1: Frequency allocation in the European Union

Frequency range [MHz] Usage Regulation Harmonized standard ITS-G5D 5 905 to 5 925 Future ITS applications ECC Decision ECC/DEC(02)01 [i.4] EN 302 571 [1] ITS-G5A 5 875 to 5 905 ITS road safety related applications Commission Decision 2008/671/EC [i.7] EN 302 571 [1] ITS-G5B 5 855 to 5 875 ITS non-safety applications ECC Recommendation ECC/REC/(08)01 [i.2] EN 302 571 [1] ITS-G5C 5 470 to 5 725 RLAN (BRAN, WLAN) ERC Decision ERC/DEC(99)23 [i.3] Commission Decisions 2005/513/EC [i.5] and 2007/90/EC [i.6] EN 301 893 [i.14]

NOTE: The Commission Decision 2008/671/ECC [i.7] is in line with the ECC Decision ECC/DEC(02)01 [i.4]. Figure 3 illustrates the channel allocation in the 5 GHz range for the frequency bands listed in Table 1. It also shows the European bands for Dedicated Short Range Communication (DSRC), which in Europe refers to the EN 300 674 [i.1] used for electronic toll collection (so called CEN DSRC), for instance. DSRC is regulated by the ECC Decision ECC/DEC(02)01 [i.4]. CEN DSRCITS road safety (ITS-G5A)Future ITS applications(ITS-G5D)ITS non-safety applications (ITS-G5B) Figure 3: Channel allocation for the 5 GHz frequency range 4.2.2 ITS-G5A frequency band The ITS-G5A frequency band is set aside for ITS road traffic safety applications and it is only allowed to be used by ITS-G5 compliant stations as specified in the present document. 4.2.3 ITS-G5B frequency band The ITS-G5B frequency band is set aside for ITS non-safety road traffic applications and it is only allowed to be used by ITS-G5 compliant stations as specified in the present document. SIST EN 302 663 V1.2.1:2013

ETSI ETSI EN 302 663 V1.2.1 (2013-07) 11 4.2.4 ITS-G5C frequency band The conditions for using the ITS-G5C band are given in the Commission Decisions 2005/513/EC [i.5] and 2007/90/EC [i.6]. The technical requirements for this band are detailed in EN 301 893 [i.14]. NOTE: The ITS-G5C band is also referred to broadband radio access networks (BRAN), radio local area network (RLAN) and wireless local area network (WLAN). Operation in the RLAN band requires transmit power control (TPC), a procedure for dynamic frequency selection (DFS) and uniform spreading, in order to detect signals from radar systems and to avoid co-channel interference. This functionality is not supported when setting the MIB parameter dot11OCBActivated to true. Therefore, it is not possible to use the ITS-G5 stations for communication in the ITS-G5C band outside the context of a basic service set, the rationale behind this is detailed in the informative annex C. 4.2.5 ITS-G5D frequency band This frequency band is set aside for future usage of ITS road traffic applications and it is allowed to be used by ITS-G5 compliant stations as specified in the present document.

4.3 Channel allocation Channel allocation shall be as specified in Table 1. One physical channel is allocated to be the control channel (CCH), termed G5-CCH. Seven fixed service channels and one variable physical service channel are identified as G5-SCHs. Table 2: European channel allocation Channel type Centre frequency IEEE 802.11-2012 [3] channel number Channel spacing Default data rate TX power limit TX power density limit G5-CCH 5 900 MHz 180 10 MHz 6 Mbit/s 33 dBm EIRP 23 dBm/MHz G5-SCH2 5 890 MHz 178 10 MHz 12 Mbit/s 23 dBm EIRP 13 dBm/MHz G5-SCH1 5 880 MHz 176 10 MHz 6 Mbit/s 33 dBm EIRP 23 dBm/MHz G5-SCH3 5 870 MHz 174 10 MHz 6 Mbit/s 23 dBm EIRP 13 dBm/MHz G5-SCH4 5 860 MHz 172 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz G5-SCH5 5 910 MHz 182 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz G5-SCH6 5 920 MHz 184 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz G5-SCH7 As described in EN 301 893 [i.14] for the band 5 470 MHz to 5 725 MHz 94 to 145 several dependent on channel spacing 30 dBm EIRP (DFS master) 17 dBm/MHz 23 dBm EIRP (DFS slave) 10 dBm/MHz NOTE: With respect to emission limits (power limit/power density limit), the more stringent requirement applies.

The usage of G5-CCH and G5-SCH1 to G5-SCH2 are dedicated basically for ITS road safety. G5-SCH3 to G5-SCH5 are essentially dedicated for ITS road traffic efficiency. A more detailed description of usage is defined in TS 102 724 [i.9]. In Table 3 the different physical channels are mapped to the frequency ranges found in Table 1 for clarification.

Table 3: European channel allocation
Channel type
Frequency range [MHz] IEEE channel number ITS-G5A G5-CCH 5 895 to
...

ETSI EN 302 663 V1.2.1 (2013-07)
European Standard
Intelligent Transport Systems (ITS);
Access layer specification for
Intelligent Transport Systems operating
in the 5 GHz frequency band
---------------------- Page: 1 ----------------------
2 ETSI EN 302 663 V1.2.1 (2013-07)
Reference
REN/ITS-0040028
Keywords
ITS, layer 1, layer 2, MAC, profile, radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
Individual copies of the present document can be downloaded from:
http://www.etsi.org

The present document may be made available in more than one electronic version or in print. In any case of existing or

perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).

In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive

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ETSI
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3 ETSI EN 302 663 V1.2.1 (2013-07)
Contents

Intellectual Property Rights ................................................................................................................................ 4

Foreword ............................................................................................................................................................. 4

Introduction ........................................................................................................................................................ 4

1 Scope ........................................................................................................................................................ 5

2 References ................................................................................................................................................ 5

2.1 Normative references ......................................................................................................................................... 5

2.2 Informative references ........................................................................................................................................ 6

3 Definitions, symbols and abbreviations ................................................................................................... 7

3.1 Definitions .......................................................................................................................................................... 7

3.2 Symbols .............................................................................................................................................................. 7

3.3 Abbreviations ..................................................................................................................................................... 7

4 General requirements ............................................................................................................................... 8

4.1 Architecture ........................................................................................................................................................ 8

4.2 Frequency allocation ........................................................................................................................................ 10

4.2.1 Introduction................................................................................................................................................. 10

4.2.2 ITS-G5A frequency band ............................................................................................................................ 10

4.2.3 ITS-G5B frequency band ............................................................................................................................ 10

4.2.4 ITS-G5C frequency band ............................................................................................................................ 11

4.2.5 ITS-G5D frequency band ............................................................................................................................ 11

4.3 Channel allocation ............................................................................................................................................ 11

4.4 Transmit requirements ...................................................................................................................................... 12

4.5 Receive requirements ....................................................................................................................................... 12

4.6 Quality of service ............................................................................................................................................. 12

5 ITS-G5 Access layer .............................................................................................................................. 12

5.1 Decentralized Congestion Control ................................................................................................................... 12

5.2 Coexistence between CEN DSRC and ITS-G5 ................................................................................................ 12

6 Conformance and test methods .............................................................................................................. 13

Annex A (normative): MIB parameter .............................................................................................. 14

Annex B (informative): Introduction to IEEE 802.11-2012 [3] .......................................................... 15

B.1 Introduction ............................................................................................................................................ 15

B.2 Network topology ................................................................................................................................... 16

B.3 Physical layer ......................................................................................................................................... 16

B.4 Medium access control ........................................................................................................................... 17

B.4.1 Introduction ...................................................................................................................................................... 17

B.4.2 Backoff procedure ............................................................................................................................................ 18

B.4.3 Medium access control ..................................................................................................................................... 18

B.4.4 EDCA parameters, AC and UP ........................................................................................................................ 19

B.5 Implications of the dot11OCBActivated set to true ............................................................................... 21

Annex C (informative): ITS-G5C frequency band .............................................................................. 22

Annex D (informative): Bibliography ................................................................................................... 23

History .............................................................................................................................................................. 24

ETSI
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4 ETSI EN 302 663 V1.2.1 (2013-07)
Intellectual Property Rights

IPRs essential or potentially essential to the present document may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is 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 Web

server (http://ipr.etsi.org).

Pursuant to the ETSI IPR Policy, no investigation, 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.
Foreword

This European Standard (EN) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS).

National transposition dates
Date of adoption of this EN: 2 July 2013
Date of latest announcement of this EN (doa): 31 October 2013
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 April 2014
Date of withdrawal of any conflicting National Standard (dow): 30 April 2014
Introduction

The present document is outlining the two lowest layers - physical layer and data link layer - in the protocol stack for

supporting vehicle-to-vehicle communications in an ad hoc network to be used at the 5,9 GHz frequency band allocated

in Europe. The two lowest layers are termed access layer in the present document and the technology specified for the

access layer is collectively called ITS-G5. The ITS-G5 standard is using already existing standards for communications.

The data link layer is divided into two sublayers; medium access control and logical link control. The physical layer and

the medium access control layer are covered in IEEE 802.11-2012 [3]. The logical link control is based on the

IEEE/ISO/IEC 8802-2-1998 [5]. The ITS-G5 standard also adds features for decentralized congestion control (DCC)

methods TS 102 687 [8] to control the network load and avoid unstable behaviour.

By setting the management information base (MIB) parameter dot11OCBActivated to true in

IEEE 802.11-2012 [3] a new capability is introduced namely the possibility to communicate outside the context of a

basic service set (BSS), which is the smallest building block of a 802.11 network. Communication outside the BSS

implies that neither authentication/association procedures nor security mechanisms are supported. Further, no access

point functionality is present. The disable of these features also affects other built-in features of IEEE 802.11-2012 [3].

The requirement that nodes should share a common clock is no longer valid while dot11OCBActivated is true.

Further, scanning of available frequency channels for joining a BSS is also disabled implying that communication

outside the context of the BSS requires that a node is configured for a predetermined frequency channel where more

information about other available frequency channels can be obtained.

NOTE: IEEE has compiled a new version of the 802.11 standard where all approved amendments produced

between 2007 and 2011 have been enrolled in the base standard including 802.11p. This new version

called IEEE 802.11-2012 [3] was approved in March 2012. Due to this new version of 802.11 the 802.11p

amendment is classified as superseded.
ETSI
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5 ETSI EN 302 663 V1.2.1 (2013-07)
1 Scope

The scope of the present document is to define the two lowest layers, physical layer and the data link layer, grouped into

the access layer of the ITS station reference architecture EN 302 665 [i.8]. The access layer technology that is specified

in the present document is collectively called ITS-G5. It is part of the communication stack supporting data exchange

between mobile stations without prior network set-up, i.e. ad hoc mode, for the following frequency bands in Europe:

• ITS-G5A: Operation of ITS-G5 in European ITS frequency bands dedicated to ITS for safety related

applications in the frequency range 5,875 GHz to 5,905 GHz.

• ITS-G5B: Operation in European ITS frequency bands dedicated to ITS non-safety applications in the

frequency range 5,855 GHz to 5,875 GHz.

• ITS-G5D: Operation of ITS applications in the frequency range 5,905 GHz to 5,925 GHz.

The ITS-G5 technology is based on IEEE 802.11-2012 [3] and IEEE/ISO/IEC 8802-2-1998 [5]. By setting the MIB

variable dot11OCBActivated to true in IEEE 802.11-2012 [3] communication outside the context of a BSS is

possible. This type of communication allows for immediate exchange of data frames, avoiding the management

overhead used with the establishment of a network. All requirements in IEEE 802.11-2012 [3] associated with

communication "outside the context of a BSS" are also requirements in the present document. All optional functionality

in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" is also optional in the present

document.
2 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

reference document (including any amendments) applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

http://docbox.etsi.org/Reference.

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

their long term validity.
2.1 Normative references

The following referenced documents are necessary for the application of the present document.

[1] ETSI EN 302 571 (V1.1.1): "Intelligent Transport Systems (ITS); Radiocommunications

equipment operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonized EN covering

the essential requirements of article 3.2 of the R&TTE Directive".

[2] ETSI TS 102 792 (V1.1.1): "Intelligent Transport Systems (ITS); Mitigation techniques to avoid

interference between European CEN Dedicated Short Range Communication (CEN DSRC)

equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".

[3] IEEE 802.11-2012: "IEEE Standard for Information technology - Telecommunications and

information exchange between systems - Local and metropolitan area networks-Specific

requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY)

Specifications".

[4] IEEE 802-2001: "IEEE Standard for Local and Metropolitan Area Networks: Overview and

Architecture".

[5] IEEE/ISO/IEC 8802-2-1998: "Information technology -- Telecommunications and information

exchange between systems -- Local and metropolitan area networks -- Specific requirements --

Part 2: Logical Link Control".
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6 ETSI EN 302 663 V1.2.1 (2013-07)

[6] ISO/IEC 7498-1:1994: "Information technology - Open Systems Interconnection - Basic

Reference Model: The Basic Model".

[7] Recommendation ITU-T X.691 (2008): "Information technology - ASN.1 encoding rules:

Specification of Packed Encoding Rules (PER)".

[8] ETSI TS 102 687 (V1.1.1): "Intelligent Transport Systems (ITS); Decentralized Congestion

Control Mechanisms for Intelligent Transport Systems operating in the 5 GHz range; Access layer

part".
2.2 Informative references

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] ETSI EN 300 674 (all parts): "Electromagnetic compatibility and Radio spectrum Matters (ERM);

Road Transport and Traffic Telematics (RTTT); Dedicated Short Range Communication (DSRC)

transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and

Medical (ISM) band".

[i.2] ECC/REC/(08)01: "ECC Recommendation (08)01 on the use of the band 5855-5875 MHz for

Intelligent Transport Systems (ITS)".

[i.3] ERC/DEC(99)23: "ERC Decision of 29 November 1999 on the harmonised frequency bands to be

designated for the introduction of High Performance Radio Local Area Networks (HIPERLANs)".

[i.4] ECC/DEC(02)01: "ECC Decision of 15 March 2002 on the frequency bands to be designated for

the co-ordinated introduction of Road Transport and Traffic Telematic Systems".

[i.5] Commission Decision 2005/513/EC of 11 July 2005 on the harmonised use of radio spectrum in

the 5 GHz frequency band for the implementation of wireless access systems including radio local

area networks (WAS/RLANs).

[i.6] Commission Decision 2007/90/EC of 12 February 2007 amending Decision 2005/513/EC on the

harmonised use of radio spectrum in the 5 GHz frequency band for the implementation of Wireless

Access Systems including Radio Local Area Networks (WAS/RLANs).

[i.7] Commission Decision 2008/671/EC of 5 August 2008 on the harmonised use of radio spectrum in

the 5 875-5 905 MHz frequency band for safety-related applications of Intelligent Transport

Systems (ITS).

[i.8] ETSI EN 302 665 (V1.1.1): "Intelligent Transport Systems (ITS); Communications Architecture".

[i.9] ETSI TS 102 724 (V0.0.11): "Intelligent Transport Systems (ITS); Harmonized Channel

Specifications for Intelligent Transport Systems operating in the 5 GHz frequency band".

[i.10] ANSI/IEEE Std 802.1D 1998: "IEEE Standard for Information technology - Telecommunications

and information exchange between systems - Local and metropolitan area networks - Common

specifications- Part 3: Media Access Control (MAC) Bridges".

[i.11] IEEE 802.11p-2010: "IEEE Standard for Information technology-- Local and metropolitan area

networks-- Specific requirements-- Part 11: Wireless LAN Medium Access Control (MAC) and

Physical Layer (PHY) Specifications Amendment 6: Wireless Access in Vehicular Environments".

[i.12] IEEE 802.11a-1999: "IEEE Standard for Telecommunications and Information Exchange Between

Systems - LAN/MAN Specific Requirements - Part 11: Wireless Medium Access Control (MAC)

and physical layer (PHY) specifications: High Speed Physical Layer in the 5 GHz band".

[i.13] IEEE 802.11e-2005: "IEEE Standard for Information technology-- Local and metropolitan area

networks-- Specific requirements-- Part 11: Wireless LAN Medium Access Control (MAC) and

Physical Layer (PHY) Specifications - Amendment: Medium Access Method (MAC) Quality of

Service Enhancements".
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7 ETSI EN 302 663 V1.2.1 (2013-07)

[i.14] ETSI EN 301 893 (V1.5.1): "Broadband Radio Access Networks (BRAN); 5 GHz high

performance RLAN; Harmonized EN covering the essential requirements of article 3.2 of the

R&TTE Directive".

[i.15] ETSI EN 302 502 (V1.2.1): "Broadband Radio Access Networks (BRAN); 5,8 GHz fixed

broadband data transmitting systems; Harmonized EN covering the essential requirements of

article 3.2 of the R&TTE Directive".
3 Definitions, symbols and abbreviations
3.1 Definitions

For the purposes of the present document, the terms and definitions given in EN 302 571 [1], TS 102 792 [2],

IEEE 802.11-2012 [3], IEEE 802-2001 [4], IEEE/ISO/IEC 8802-2-1998 [5], ISO/IEC 7498-1 [6], Recommendation

ITU-T X.691 [7] and the following apply:
ethertype: identifier to the network protocol above the data link layer

ITS-G5: access technology to be used in frequency bands dedicated for European intelligent transport System (ITS)

ITS-G5 Control Channel: physical channel for ITS-G5
ITS-G5 Service Channel: physical channel for ITS-G5
ITS-G5 Station: ITS station that operates using ITS-G5 channels
3.2 Symbols
For the purposes of the present document, the following symbols apply:
aCWmax Maximum value of Contention Window
aCWmin Minimum value of Contention Window
AIFS Arbitration InterFrame Space
AIFSN Arbitration InterFrame Space Number
aSIFSTime Short InterFrame Space defined by the physical layer
aSlotTime A slot time defined by the physical layer
CW Contention Window
CW Maximum value of Contention Window
max
Minimum value of Contention Window
min
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Access Category
AC_BE Access Category Best Effort
AC_BK Access Category Background
AC_VI Access Category Video
AC_VO Access Category Voice
ACK Acknowledgment
AIFS Arbitration InterFrame Space
AIFSN Arbitration InterFrame Space Number
AP Access Point
BE Best Effort
BK Background
BPSK Binary Phase Shift Keying
BRAN Broadband Radio Access Network
BSS Basic Service Set
ETSI
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8 ETSI EN 302 663 V1.2.1 (2013-07)
BSSID Basic Service Set Identification
CCH Control Channel
CEN European Committee for Standardisation
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
CW Contention Window
DCC Decentralized Congestion Control
DCF Distributed Coordination Function
DFS Dynamic Frequency Selection
DIFS Distributed InterFrame Space
DSRC Dedicated Short-Range Communication
ECC Electronic Communication Committee
EDCA Enhanced Distribution Coordination Access
EE Excellent Effort
EIRP Effective Isotropic Radiated Power
EN European Norm
G5-CCH ITS-G5 Control Channel
G5-SCH ITS-G5 Service Channel
GPS Global Positioning System
IBSS Independent Basic Service Set
IEEE Institute of Electrical and Electronics Engineers
ITS Intelligent Transport System
ITS-G5A Frequency band ranging from 5 875 MHz to 5 905 MHz
ITS-G5B Frequency band ranging from 5 855 MHz to 5 875 MHz
ITS-G5C Frequency band ranging from 5 470 MHz to 5 725 MHz
ITS-G5D Frequency band ranging from 5 905 MHz to 5 925 MHz
LLC Logical Link Control
MAC Medium Access Control
MIB Management Information Base
MPDU MAC Protocol Data Unit
NC Network Control
OFDM Orthogonal Frequency Division Multiplexing
OSI Open Systems Interconnect
PHY Physical layer
PLCP Physical Layer Convergence Protocol
PPDU PLCP Protocol Data Unit
PSDU PLCP Service Data Unit
QAM Quadrature Amplitude Modulation
QoS Quality of Service
QPSK Quadrature Phase Shift Keying
RLAN Radio Local Area Network
SNAP SubNetwork Access Protocol
TPC Transmit Power Control
TR Technical Report
TS Technical Specification
TX Transmitter
UP User Priority
VI Video
VO Voice
WLAN Wireless Local Area Network
4 General requirements
4.1 Architecture

Figure 1 shows the ITS station reference architecture EN 302 665 [i.8]. The present document specifies one access

technology for cooperative ITS namely ITS-G5 based on IEEE 802.11-2012 [3]. The access layer of the ITS station

reference architecture includes both the physical layer and the data link layer of the OSI model.

ETSI
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9 ETSI EN 302 663 V1.2.1 (2013-07)
Figure 1: ITS station reference architecture

In Figure 2 the ITS-G5 access layer architecture is outlined. The security entity shown in Figure 1 is included as a part

of the management entity EN 302 665 [i.8].
IN-SAP
ITS-G5 Access layer
Logical Link Control
(LLC)
Medium Access Control
(MAC)
Physical layer
(PHY)
Figure 2: ITS-G5 access layer architecture
An ITS-G5 station shall be compliant with the following IEEE standards:

1) The physical (PHY) layer orthogonal frequency division multiplexing (OFDM) as defined in clause 18 of

IEEE 802.11-2012 [3].

2) The medium access control (MAC) layer functionality as defined in IEEE 802.11-2012 [3] by setting the MIB

parameter dot11OCBActivated to true enabling communication outside the context of a basic service set

(BSS).

3) The logical link control (LLC) as defined in IEEE/ISO/IEC 8802-2-1998 [5] and the mode of operation is set

to Type 1 - unacknowledged connectionless mode.
4) The subnetwork access protocol (SNAP) as defined in IEEE 802-2001 [4].

An ITS-G5 station shall comply to the functionality defined in clause 5 ITS-G5 Access layer.

The SNAP provides the possibility to distinguish between different network protocols through EtherTypes.

In annex B an informative introduction to IEEE 802.11-2012 [3], where the MIB parameter dot11OCBActivated is

set to true, is given to facilitate the reading of the present document.
ETSI
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10 ETSI EN 302 663 V1.2.1 (2013-07)
4.2 Frequency allocation
4.2.1 Introduction

Table 1 shows the frequency ranges, related regulatory requirements, intended usage and harmonized standards to be

used for cooperative ITS within the European Union.
Table 1: Frequency allocation in the European Union
Frequency range Usage Regulation Harmonized
[MHz] standard

ITS-G5D 5 905 to 5 925 Future ITS applications ECC Decision ECC/DEC(02)01 [i.4] EN 302 571 [1]

ITS-G5A 5 875 to 5 905 ITS road safety related Commission Decision 2008/671/EC [i.7] EN 302 571 [1]

applications
ITS-G5B 5 855 to 5 875 ITS non-safety ECC Recommendation EN 302 571 [1]
applications ECC/REC/(08)01 [i.2]

ITS-G5C 5 470 to 5 725 RLAN (BRAN, WLAN) ERC Decision ERC/DEC(99)23 [i.3] EN 301 893 [i.14]

Commission Decisions 2005/513/EC [i.5]
and 2007/90/EC [i.6]

NOTE: The Commission Decision 2008/671/ECC [i.7] is in line with the ECC Decision ECC/DEC(02)01 [i.4].

Figure 3 illustrates the channel allocation in the 5 GHz range for the frequency bands listed in Table 1. It also shows the

European bands for Dedicated Short Range Communication (DSRC), which in Europe refers to the EN 300 674 [i.1]

used for electronic toll collection (so called CEN DSRC), for instance. DSRC is regulated by the ECC Decision

ECC/DEC(02)01 [i.4].
S G
I 5
G T
s -
n S
C T
I n
a i
S y t
l a
p f
N a
a s
p
y d
C a
f o
a T
- S
n T
o u
S F
Figure 3: Channel allocation for the 5 GHz frequency range
4.2.2 ITS-G5A frequency band

The ITS-G5A frequency band is set aside for ITS road traffic safety applications and it is only allowed to be used by

ITS-G5 compliant stations as specified in the present document.
4.2.3 ITS-G5B frequency band

The ITS-G5B frequency band is set aside for ITS non-safety road traffic applications and it is only allowed to be used

by ITS-G5 compliant stations as specified in the present document.
ETSI
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11 ETSI EN 302 663 V1.2.1 (2013-07)
4.2.4 ITS-G5C frequency band

The conditions for using the ITS-G5C band are given in the Commission Decisions 2005/513/EC [i.5] and

2007/90/EC [i.6]. The technical requirements for this band are detailed in EN 301 893 [i.14].

NOTE: The ITS-G5C band is also referred to broadband radio access networks (BRAN), radio local area network

(RLAN) and wireless local area network (WLAN).

Operation in the RLAN band requires transmit power control (TPC), a procedure for dynamic frequency selection

(DFS) and uniform spreading, in order to detect signals from radar systems and to avoid co-channel interference. This

functionality is not supported when setting the MIB parameter dot11OCBActivated to true. Therefore, it is not

possible to use the ITS-G5 stations for communication in the ITS-G5C band outside the context of a basic service set,

the rationale behind this is detailed in the informative annex C.
4.2.5 ITS-G5D frequency band

This frequency band is set aside for future usage of ITS road traffic applications and it is allowed to be used by ITS-G5

compliant stations as specified in the present document.
4.3 Channel allocation

Channel allocation shall be as specified in Table 1. One physical channel is allocated to be the control channel (CCH),

termed G5-CCH. Seven fixed service channels and one variable physical service channel are identified as G5-SCHs.

Table 2: European channel allocation
Channel type Centre IEEE 802.11- Channel Default data TX power limit TX power
frequency 2012 [3] channel spacing rate density limit
number
G5-CCH 5 900 MHz 180 10 MHz 6 Mbit/s 33 dBm EIRP 23 dBm/MHz
G5-SCH2 5 890 MHz 178 10 MHz 12 Mbit/s 23 dBm EIRP 13 dBm/MHz
G5-SCH1 5 880 MHz 176 10 MHz 6 Mbit/s 33 dBm EIRP 23 dBm/MHz
G5-SCH3 5 870 MHz 174 10 MHz 6 Mbit/s 23 dBm EIRP 13 dBm/MHz
G5-SCH4 5 860 MHz 172 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz
G5-SCH5 5 910 MHz 182 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz
G5-SCH6 5 920 MHz 184 10 MHz 6 Mbit/s 0 dBm EIRP -10 dBm/MHz
G5-SCH7 As described in 94 to 145 several dependent on 30 dBm EIRP 17 dBm/MHz
EN 301 893 [i.14] channel spacing (DFS master)
for the band 23 dBm EIRP 10 dBm/MHz
5 470 MHz to
(DFS slave)
5 725 MHz

NOTE: With respect to emission limits (power limit/power density limit), the more stringent requirement applies.

The usage of G5-CCH and G5-SCH1 to G5-SCH2 are dedicated basically for ITS road safety. G5-SCH3 to G5-SCH5

are essentially dedicated for ITS road traffic eff
...

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