Communication Modes
CALM enables the following communication modes:
- Vehicle-to-Infrastructure (V2I): communication initiated by either roadside or vehicle (e.g. petrol forecourt or toll booth)
- Vehicle-to-Vehicle (V2V): peer to peer ad-hoc networking amongst fast moving objects following the idea of MANET's/VANET's.
- Infrastructure-to-Infrastructure (I2I): point-to-point connection where conventional cabling is undesirable (e.g. using lamp posts or street signs to relay signals)
Methods of transmission used by CALM may be based on one or more of the following communication media:
- Infrared
- GSM (2G, 3G cellular telephone communication technology)
- DSRC 5.8-5.9 GHz (legacy systems)
- Various evolutions of the IEEE 802.11 standard including WAVE (IEEE P1609.3/D23), M5 (ISO 21215)
- WiMAX, IEEE 802.16e
- MM-wave (63 GHz)
- Satellite
- Bluetooth
- RFID
The CALM architecture provides an abstraction layer for vehicle applications, managing communication for multiple concurrent sessions spanning all communications modes, and all methods of transmission.
Read more about this topic: Communications, Air-interface, Long And Medium Range
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