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Etsi Tr 102 862 V1.1.1 (2011-12) ETSI TR 102 862 V1.1.1 (2011-12) Technical Report Intelligent Transport Systems (ITS); Performance Evaluation of Self-Organizing TDMA as Medium Access Control Method Applied to ITS; Access Layer Part 2 ETSI TR 102 862 V1.1.1 (2011-12) Reference DTR/ITS-0040021 Keywords ITS, MAC, TDMA 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 2011. 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. ETSI 3 ETSI TR 102 862 V1.1.1 (2011-12) Contents Intellectual Property Rights ................................................................................................................................ 5 Foreword ............................................................................................................................................................. 5 Introduction ........................................................................................................................................................ 5 1 Scope ........................................................................................................................................................ 7 2 References ................................................................................................................................................ 7 2.1 Normative references ......................................................................................................................................... 7 2.2 Informative references ........................................................................................................................................ 7 3 Definitions, symbols and abbreviations ................................................................................................. 12 3.1 Definitions ........................................................................................................................................................ 12 3.2 Symbols ............................................................................................................................................................ 12 3.3 Abbreviations ................................................................................................................................................... 13 4 Introduction ............................................................................................................................................ 14 4.1 Medium access control in VANETs ................................................................................................................. 14 4.2 Requirements for road traffic safety applications ............................................................................................. 15 4.3 Hidden terminal problem .................................................................................................................................. 16 5 CSMA..................................................................................................................................................... 19 5.1 Introduction ...................................................................................................................................................... 19 5.2 Channel access procedure and parameters ....................................................................................................... 19 5.3 Simultaneous transmissions.............................................................................................................................. 21 5.4 Summary .......................................................................................................................................................... 21 6 Motivations for time slotted MAC approaches ...................................................................................... 21 7 Time slotted MAC approaches ............................................................................................................... 22 7.1 Introduction ...................................................................................................................................................... 22 7.2 STDMA ............................................................................................................................................................ 24 7.2.1 Introduction................................................................................................................................................. 24 7.2.1.1 The AIS system ..................................................................................................................................... 24 7.2.1.2 Position reports ..................................................................................................................................... 25 7.2.1.3 Overhead to run the STDMA algorithm................................................................................................ 26 7.2.2 Parameters................................................................................................................................................... 26 7.2.3 Channel access procedure ........................................................................................................................... 28 7.2.3.1 Initialization .......................................................................................................................................... 28 7.2.3.2 Network entry ....................................................................................................................................... 28 7.2.3.3 First frame ............................................................................................................................................. 29 7.2.3.4 Continuous operation ............................................................................................................................ 29 7.2.3.5 Summary ............................................................................................................................................... 30 7.2.4 Simultaneous transmissions ........................................................................................................................ 30 7.2.5 Summary ..................................................................................................................................................... 32 7.3 MS-Aloha ......................................................................................................................................................... 32 7.3.1 Introduction................................................................................................................................................. 32 7.3.2 Channel access procedure ........................................................................................................................... 33 7.3.2.1 Memory refresh ..................................................................................................................................... 34 7.3.2.2 Solutions against protocol overheads .................................................................................................... 35 7.3.3 Simultaneous transmissions ........................................................................................................................ 36 7.3.3.1 Prevention of hidden terminals and unintentional slot re-use ............................................................... 37 7.3.3.2 Slot reuse at four-hop distance .............................................................................................................. 37 7.3.3.3 Mechanisms for forced slot re-use ........................................................................................................ 38 7.3.3.4 Dynamic mechanisms for the forced slot re-use ................................................................................... 38 7.3.3.5 Pre-emption ..........................................................................................................................................
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