1Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►Infrastructure based networks are already deployed ►Currently, only safety.

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Presentation transcript:

1Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►Infrastructure based networks are already deployed ►Currently, only safety applications have technical demand for vehicle-2-vehicle communication ►Cellular communication is even getting better with LTE / LTE Advanced  Latency goes down ►Aktiv CoCar: for most applications cellular network is usable ►Motivation for direct Vehicle-2-Vehicle communication? ►Low delay (  safety applications) ►General communication over V2V (risk of overload for cellular networks?) ►Cost reduction (  no network operator to pay) ►Current state of the art assumes car-2-car/car-2-infrastructure == WLAN p ►We should separate communication principles from communication technologies! ►Avoid dependence on one particular technology

2Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►Location Based Services ►Currently implemented by cellular technologies ►Possibly new business models could enable vehicle-to-infrastructure communications, e.g. grocery store pays for road-side-unit since it is also used for advertising ►Vehicle-to-Vehicle communication research ►Safety applications ►Traffic efficiency applications ►Monitoring environmental conditions (pollution, weather, fuel consumption, …) ►Communication Patterns ►Periodic Broadcast (Beaconing) ►Store-Carry-Forward

3Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►Communication Characteristics ►Local communication ►Low Latency ►Typical: One-hop Broadcast Small packets (Beacons): Speed, latency, direction,…  DSRC ►Beaconing mechanisms ►Adapt rate ►Adapt transmission power ►Design principles ►Robustness against packet loss, complete loss of link ►Minimize the probability of packet loss  or  design to cope with packet loss

4Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►What is the relation of cellular communication and vehicle-to-vehicle communication ►Competitors or one extends/replaces each other ►Avoid dependence on cellular infrastructure (safety applications: car needs to be autonomous!) ►Does the game change with electric vehicles? ►Value of correct information (traffic congestion, height data) increases ►Frequency used for car-2-car communications ►Most current works assume GHz (2.4, 5.9…) ►Communication would look much different if we shift to e.g. 600 MHz  LOS not a problem ►Combination of high speed GHz communication with low speed communication at lower frequencies? ►For safety, we do not need high rates but reliability and wide range

5Titel oder Name, Abteilung, Datum Communication Principles State of the Art ►Car-2-Car Communication ►For safety applications only ►Or: use spare capacity for other applications? ►Can VANET patterns be applied to other domains? ►Pedestrians with cell phones (tests indicate that beaconing will only increase power by 1-2%) ►Bicycles (with bicycle OBU or mobile device) ►Data Dissemination ►Geocast / directed broadcast ►Unicast up to an area, broadcast afterwards? Applications? ►Where do we perform re-broadcasting of information? (network layer, transport layer, app layer?) ►Even end-to-end on a small scale? ►Other topic: directional antenna applications

6Titel oder Name, Abteilung, Datum Vielen Dank.