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Intelligent Transport Systems - Telenor

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Figure 5 ITS vehicle –<br />

Infrastructure communications<br />

based on CALM<br />

Figure 6 Sample in-vehicle<br />

implementations with<br />

CALM, and other communication<br />

interfaces (UTRA<br />

will be added in future)<br />

26<br />

Vehicle Computer<br />

ITS Applications<br />

CME<br />

VC<br />

and<br />

NME<br />

CALM<br />

network<br />

IVN DLL<br />

IVN PHY<br />

Vehicle computer<br />

CME<br />

RESOURCE<br />

MANAGER<br />

ISO 14906<br />

Application<br />

Interfac<br />

ISO 15628<br />

CME<br />

OBU<br />

SAP<br />

NME<br />

SAP<br />

MLME<br />

PLCP<br />

PLME<br />

SAP<br />

SAP<br />

Network<br />

IVN DLL<br />

IVN PHY<br />

CALM OBU<br />

Routing<br />

Network<br />

CALM LLC<br />

CALM MAC<br />

MS PHY<br />

been strengthened. Note that in this figure, the<br />

range is up to 1000 metres (from access points).<br />

The concept of CALM in the vehicle is relatively<br />

simple. The car manufacturers (or OEMs)<br />

have their own data buses in the vehicle. The<br />

different media boxes are connected to this bus,<br />

and one or more computers that use the media<br />

are also connected. One interesting aspect is the<br />

connection to the engine/traction control networks.<br />

This means that the ITS functions can get<br />

hold of information about road traction/tempera-<br />

ITS INTERNET<br />

APPLICATION<br />

Socket<br />

TCP/UDP<br />

CALM routing<br />

CALM NTWORK LAYER$FMIPv6<br />

Vehiclevehicle<br />

Application<br />

PACKET<br />

HOP<br />

(RUDP)<br />

IN-VEHICLE NETWORK DATA LINK LAYER<br />

IN-VEHICLE NETWORK PHYSICAL LAYER<br />

ITS In-Vehicle Network<br />

CALM OBU<br />

Network<br />

IVN LLC<br />

IVN PHY<br />

Network<br />

CALM LLC<br />

CALM MAC<br />

CALM BASE<br />

STATION<br />

Infrastruct Server<br />

ITS Applications<br />

3) Figures 4, 6 and 7 were presented by Knut Evensen at The ITS World Conference, Chicago in October 2002. Figure 4 is rendered here in an updated<br />

version. Figure 5 was presented at ITS America’s annual meeting, April 2002.<br />

CME<br />

BS<br />

Routing<br />

SAP<br />

NME<br />

Network Network<br />

SAP<br />

SAP<br />

CALM LLC Fixed<br />

network<br />

MLME CALM MAC DLL<br />

PLCP SAP<br />

PLME MS PHY<br />

Fixed net<br />

PHY<br />

CALM routing<br />

GPRS<br />

Convergence<br />

DSRG<br />

Convergence<br />

CME<br />

IS<br />

and<br />

NME<br />

Network Network Network<br />

GPS<br />

Convergence<br />

GPRS Stack DSRG L2/L7 GPS Stack<br />

CALM M5 PHY GPRS PHY DSRG L1 GPS PHY<br />

CALM<br />

Network<br />

Fixed<br />

network<br />

DLL<br />

Fixed net<br />

PHY<br />

ture and other safety info to broadcast to approaching<br />

vehicles. It also means that car manufacturers<br />

may have service access to the systems<br />

on-board, for instance to check the status or to<br />

download new firmware revisions to the onboard<br />

computers.<br />

Figure 5 illustrates the protocol hierarchy in the<br />

CALM-Vehicle infrastructure. Please note that<br />

direct peer-to-peer communications between<br />

vehicles also should be possible.<br />

Figure 6 illustrates a sample physical implementation<br />

of the communications. Note that in this<br />

case there may be several parallel communication<br />

parts. 3)<br />

5 Conclusion<br />

Although it is still “early dawn” in the age of<br />

ITS, there are already many success stories:<br />

• Improved, more efficient public bus systems in<br />

London, Bologna, Flanders, Barcelona, Brussels,<br />

Geneva, Rouen, Madrid, Hampshire [7];<br />

• Advanced travellers’ information systems – to<br />

drivers in France, England and Scotland, Germany<br />

and others countries [8];<br />

Combined Antenna Pad<br />

CME<br />

NME<br />

MLME<br />

PLCP/<br />

PLME<br />

Telektronikk 1.2003

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