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Broadcast Methods for Inter-Vehicle Communications System
T. Fukuhara, T. Warabino, T. Ohseki, K. Saito, K. Sugiyama,T. Nishida, K. Eguchi
IEEE Communications Society / WCNC 2005
Speaker: 69721039 楊政叡 69821018 辜紹桓 69818005 王力
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Introduction Intelligent Transport System (ITS)
Roadside-to-vehicle communications client – server
Inter-vehicle communications peer to peer
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Proposed Methods Conventional broadcast
Emergency information is relayed and notified in all directions. May cause secondary accidents. Resources wasted.
Emergency Information is needed by vehicles in a particular area.
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Principle of Proposed Method Emergency vehicle transmit a broadcast
packet including its own location, forward movement direction, available relay range and available notification range.
The information is notified only to vehicles which are both within the available notification range and in front of the emergency vehicle.
Principle of Proposed Method Broadcast area for emergency-vehicle-approach
information.
Procedure of Proposed Method Definition of calculation parameters.
Procedure of Proposed Method Vehicle receiving the broadcast packet
determines the following expressions.
Procedure of Proposed Method Vehicle is within the available notification
range. Both (1) and (2) are satisfied.
Vehicle is within the available relay range. Both (1) and (3) are satisfied.
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Principle of Proposed Method Broadcast area for Traffic Accident information.
Procedure of Proposed Method Definition of parameters in calculation
Procedure of Proposed Method Vehicle receiving the broadcast packet
determines the following expressions.
Procedure of Proposed Method Vehicle is within the available notification
range. Both (4) and (5) are satisfied.
Vehicle is within the available relay range. Both (4) and (6) are satisfied.
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Simulation Results Simulation system
evaluation node pseudo-node.
Wireless Local Area Network ( WLAN ) Routing protocol
Ad Hoc On-demand Distance Vector ( AODV )
Simulation Results
Simulation Results
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Experimental System The terminal has three communication devices:
WLAN for Ad Hoc mode communications. WLAN for infrastructure mode communications. PHS(Personal Handy-phone System in Japan).
Broadcast Method Based on AODV protocol and the proposed method.
Source transmits the RREQ packet , does not include the information of a particular destination.
RREQ message is relayed using the position and route direction of the node obtained by the GPS receiver.
The unit forward direction vector is calculated in the relay node from the route direction.
Experimental System Linux OS version 2.4.21 Programmed with JAVA.
Experimental System GPS data obtained during the vehicle runs in the test course.
Experimental System Experimental terminal GUI for controlling transmission of
emergency-vehicle-approach information and traffic accident information.
Experimental System Display on GUI in vehicle 1 when vehicle 2 transmits
emergency-vehicle-approach information.
Experimental System Display on GUI in vehicle 2, when vehicle 1 transmits traffic
accident information
Outline Introduction Proposed Methods
Emergency-vehicle-approach Information Principle of Proposed Method Procedure of Proposed Method
Traffic-accident-notification Method Principle of Proposed Method Procedure of Proposed Method
Simulation Results Experimental System Conclusions
Conclusions Proposed novel broadcast methods for inter-
vehicle communication on ITS. More efficient emergency broadcasts. Results from the simulation and experimental
system confirmed that information is broadcast to the desired area.
