Fleet Net Ppt 2

8/2/2019 Fleet Net Ppt 2

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-Internet On Road


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INTRODUCTION Driving means constantly changing location. This, in

turn, means a constant demand for information onthe current location and specifically for data on the

surrounding traffic. In particular, there is a demandfor sensor data from other cars such as data onbraking sent from a preceding car, for data on thetraffic flow on a route, and for information aboutsiteslocated along a route. To promote thedevelopment of such an inter-vehicle communicationsystem FleetNet-Internet on the Road wasintroduced.


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CLASSIFICATION

Classification of Fleetnet


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OBJECTIVES OF FLEETNETThe objectives of FleetNet are:

To develop a communication platform for

inter-vehicle communications. To implement demonstrator applications.

To develop promising introduction strategiesand

To standardize the solutions found in order toimprove drivers and passengers safety andcomfort.


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KEY FEATURES Wireless multi hop ad hoc networking extends the range of

awareness. Considering unlicensed radio frequency bands allows for low

cost data transmission. Very low data transmission delay is suitable for cooperative

driver assistance and safety related applications. Vehicles are addressed according to their position inherently

enabling position-based routing and location-based services. Vehicle to vehicle and vehicle to fixed roadside station

communication enables Internet access and Internet

integration. open solutions to be standardized and open to other vehicle

manufacturers.


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CAR TO CAR COMMUNICATION-A

KEY TO SAFETY For drivers of vehicles, information about their immediate

vicinity is crucial for being able to drive safely. So far mostinformation is gathered by direct visual observation and inresponse to sounds. Apart from that providing better guidelines

to the driver other than the observations made by him from hissurroundings will definitely help him in driving to have a securejourney. The vision of vehicle-to-vehicle and vehicle-to roadsidecommunication is that information available in cars, such asfrom sensors and instruments, can be quickly passed on toothers in the immediate vicinity, by means of this ad hocnetwork communication. The extension of sensory information

allows drivers to react more quickly to emergency situations,e.g., cars ahead braking.


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INTER-VEHICLE

COMMUNICATION PLATFORMThere are four ways of inter-vehicular

communication:

Car-to-car direct Car-to-car via relaying by intermediate

cars

Car to stationary FleetNet gateway Car-Internet via stationary FleetNet

gateway


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FLEETNET ROUTING This is also called as position based routing.

FleetNet routing assumes that vehicles are

aware of their geographical position. Bymaking use of position-based routingstrategies, an improved scaling behavior andadaptability with respect to large and highly

dynamic networks can be achieved comparedto non-position-based approaches

(cont..)


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(cont..)The requirements for implementing the

greedy position based algorithm are:

1. Each node should be aware of itsposition and position of its neighbors

2. Location service maps node IDs to

their current geographic position.3. Strategies to handle positional errors

4. Greedy forwarding + recovery strategy


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IMPLEMENTATION OF

GREEDY BASED ALGORITHMThe implementation of the above algorithm

includes the following steps:

- each node owns its position (xi, yi).- the nodes send their periodic beacon packetswith their position and node ID.

- the information is stored in neighbor table.

- after one round the neighbor table iscleared. This state is also called as softstate.


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Packet forwarding employs one of the followingmechanisms:

REACTIVE: It is a two way user-system-request-response.

INTERACTIVE: it is a mutual way offorwarding the packets. This can beemployed when a continuous communication

between two users would be going on. PROACTIVE: the packets are sent to the

system from the user and this system resendsthe received packets to the actual sensor.


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EXAMPLE

The storage of information in the neighbor would be in the

following manner:1 [2] 2 [1,3] 3 [2,4] 4 [3]


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RADIO COMMUNICATION Routing, sending the packets everything is done

perfectly but this system needs an interactive tool inorder to convey the messages to the driver. This

gives rise to the introduction of radio communicationsystems. The requirements on the FleetNet radiocommunication system are:

1. support of high bit rates;

2. Robustness in case of high relative velocities;3. Provisioning of multi hop connectivity even in lowtraffic density scenarios; and

4. Operation in unlicensed frequency bands.


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APPLICATIONS1.Cooperative driver assistance, e.g. Emergency notification Overtaking assistance Obstacle warning2. Decentralized floating car data, e.g. Traffic jam monitor Dynamic navigation Route weather forecast3. User communications and information services, e.g. Hot-spot Internet access Inter-vehicle chat Distributed games


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DISADVANTAGES The warnings are displayed in the form of

geographical coordinates.

It can be used for fun also but if used in awrong manner, fleetnet can be used to sendsome abusing messages or fake messages.

This also is pruned to hacking. This networkcan also be hijacked and may result in traffichazards as the attacker can broadcast fakepositions to the vehicles.


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CONCLUSION

Fleet Net is a feasibility study made to bring a car-to-car communication system from an idea into the realworld. Starting from the idea for a vehicular ad hoc

network by using geographical positions forcommunications in a vehicular ad hoc network, wewere able to know the benefits of this approach bymeans of network simulations. In order to developcar-to-car communication to a mature technology, we

came to know about enhancing the communicationprotocols using an approach of modeling, simulation,implementation, and measurements for continuousand sustainable improvement.


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REFERENCES

www.pdf-search-engine.com

www.car-2-car.org

www.comesafety.org

http://www.et2.tuharburg.de/fleetnet/english/search.html
http://www.pdf-search-engine.com/http://www.car-2-car.org/http://www.comesafety.org/http://www.et2.tuharburg.de/fleetnet/english/search.htmlhttp://www.et2.tuharburg.de/fleetnet/english/search.htmlhttp://www.et2.tuharburg.de/fleetnet/english/search.htmlhttp://www.et2.tuharburg.de/fleetnet/english/search.htmlhttp://www.comesafety.org/http://www.car-2-car.org/http://www.car-2-car.org/http://www.car-2-car.org/http://www.car-2-car.org/http://www.car-2-car.org/http://www.pdf-search-engine.com/http://www.pdf-search-engine.com/http://www.pdf-search-engine.com/http://www.pdf-search-engine.com/http://www.pdf-search-engine.com/


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Fleet Net Ppt 2