8/7/2019 carcomm

1/14

Inter-car communications

Scenario proposal

8/7/2019 carcomm

2/14

Scenario proposal compiled by:

Ambient Communication Research Group (ACRG)Department of Telecommunications and Media Informatics (DTMI),

and Department of Telecommunications (DT)

Budapest University of Technology and Economics (BUTE)

June 20, 2004

DTMI

8/7/2019 carcomm

3/14

3

DTMI

Continued:

Scenario proposal compiled by:

Christian, Family, Department names

Tamas Henk DTMI

Geza Gordos DTMI

Gabor Feher DTMI Rolland Vida DTMI

Robert Szabo DTMI

Imre Sandor DT Contact

Tamas Henk henk@tmit.bme.hu

8/7/2019 carcomm

4/14

4

DTMI

Communication backgrounds

Ambient Intelligence Self-organizing, ad-hoc networks

Wireless communication technologies

Transparent service discovery / plug-and-play

Peer-to-peer network management

Self-healing capability, fault tolerance

Security, AAA

8/7/2019 carcomm

5/14

5

DTMI

Assumed trends

Most of the road vehicles will be equipped with mobile communication and positioning (GPS) devices sensors for

weather vehicle dynamics (e.g. distance, acceleration,...) pollution siren detection collision

interface toward intra-car communication devices

Some components (traffic lights, announcement boards,

special cars) are connected to the Internet, they supportgateway functions

8/7/2019 carcomm

6/14

6

DTMI

Proposed communication

infrastructure of theInter-car scenario

Cars on the road form a mobile ad-hoc network high dynamicity (self-organization)

fixed elements (signposts, announcement boards, traffic lights)can be also integrated

and also connect to the fixed network through gateways

8/7/2019 carcomm

7/14

7

DTMI

Communication Challenges How to form the network

relativ positions of vehicles are unstable

righ/low relative speeds

multi-path radio wave propagation

routing, flooding, multicasting information scope, fast adaptation, scalability

Maintaining the continous operation of the ad-hocnetwork how to use information of locations and motions

determination and evaluation of car density

Authentication & Security

8/7/2019 carcomm

8/14

8

DTMI

Further challenges

This proposal does not yet touch uponrelated challenges on the fields of

Microelectroelectronics,microsensorics and actuators

Sotware engineering

Man-machine interface

8/7/2019 carcomm

9/14

9

DTMI

Appl. of Inter-car Comm. 1/x

Road Traffic Information

Exaplary goals prevention of consecutive collisions informing central traffic control about

formation of clasters of vehicels

alarming emergency services

Challenge detection of the traffic jam or obstracles

adaptive warning/alarm thresholds

localization of the traffic jam fast propagation of traffic jam information

limiting the scope of the information multicast propagation robustness & scalability

authentication, false alarms, eventcorrelation

Rational in-time alternative routes less serious accidents

8/7/2019 carcomm

10/14

10

DTMI

Appl. of Inter-car Comm. 2/xAmbient Traffic Light Control Goal:

Adapt the traffic lights to the currenttraffic conditions

Challenges: The traffic conditions change all the

time

Streets that lead to a crossroad areheavily or lightly crowded

The green light intervals shouldadapt to these Selecting that member of the ad-

hoc network, that providesinformation to the central trafficcontroller about the cluster (size,speed, etc.)

Coordination among successivetraffic lights on a same street

Preemption (priority) to publictransport & emergency services

Rational

More fluent flow of traffic Adaptiveness to the changing

conditions not pre-set

Less pollution

Harmonization of successive traffic

lights No red light when no cross traffic

Serving of inferior roads only whentraffic, no interruption of main roadstraffic

Pedestrian crossing support

8/7/2019 carcomm

11/14

8/7/2019 carcomm

12/14

12

DTMI

Appl. of Inter-car Comm. 4/x

Ambient Hitchhiking

Goal reduction of city and high-way traffic

Challenge Incentives for sharing your car with others

Possibility of using dedicated, less congestedlanes

Cars with many passengers have priority Credit based charging

Micro payments Drivers can use the credits to become

passengers next time

Destination matching, pick-up handshaking

route (multi seat) planning change cars in an ad-hoc fashion to reach the

destination

Security (service rating, anonymity,payments)

Rational Better economic

Less pollution

US example of priority lane for cars with more than one

person

8/7/2019 carcomm

13/14

13

DTMI

An illustrative tale for the Inter-

car scenario (1)

Alicethe Regional Bus Driver 5a.m.: Alice leaves for work, but this time does not take her car, instead she enters her destination

into her PDA, that acts as an ad-hoc node. As she approaches the main road, her hitchhikinginformation is spread.

5:10am: Bob, who has left for work early this time, recognizes on his cars on-board computer thatsomeone (with a nice picture of Alice) is heading for a destination he will pass by. Bob alreadynotices Alice at the corner he is approaching. Bob signals his willingness to give a lift to Alice.

5:12am: Bob and Alice together are on the road toward the city center.

5:30am: Alice has checked the latest traffic information form the Ambient Network around.

6:00am: Bob and Alice approaches the bus station. The ride happend to be fast because of the lightearly morning traffic. As they passed along all the approached traffic lights were green by theirarrival thanks to the intelligent traffic light control system.

8/7/2019 carcomm

14/14

14

DTMI

An illustrative tale for the Inter-

car scenario (2)

6:30am: Alice sitsw into her driver seat in the bus. She updates the traffic jam

information again on her PDA and departs with the bus.

7:00am: still in the city, the traffic is ever increasing. Nevertheless Alice progressesrelatively fast thanks to the intelligent traffic light control system which prioritize publictransport.

8:00am: out of the city, on the highway. Alice recognizes that there was an accidentsome 20 miles ahead. She is informed of a possible alternative route that she takes.

9:00am: luckily avoided the traffic jam, she is on the highway again. She checkswhether to leave the highway for the next stop in the village: if no one waits for this busand no one signals a stop, there is no point to leave the highway.

9:55am: She arrives to the destination, in the central part of AmI-City. She is taking arest and preparing for the return trip.