Intelligent Transport Systems (ITS); Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band (V1.2.1; Includes Diskette)
"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."