IV Work Area: CONNECTED CARS: ROAD TO VEHICLE COMMUNICATION THROUGH VISIBLE LIGHT. An illustration of traffic control system of tomorrow

Transcription

1 IV Work Area: CONNECTED CARS: ROAD TO VEHICLE COMMUNICATION THROUGH VISIBLE LIGHT An illustration of traffic control system of tomorrow

2 Motivation and Objectives IV, VV, VI optoelectronic WDM cooperative vehicular system enables direct communication between vehicles, roadside infrastructure and traffic lights control Transmitters V 1 VI VV IV Receivers V V 3

3 Outline Connected vehicles model Transmitters and Receivers IV, VV and VI communications Cooperative VLC System Evaluation and proof of concept. Conclusions and future trends.

4 State of art: MUX/DEMUX techniques G 9 R 7 V B Normalized MUX signal d 0 #7 d d1 d 3 d 4 d 5 d 6 d #9 d 8 V B G R d 9 Time (ms d 10 #1 d 11 d1 d 13 d d R G B V Normalized MUX signal V,3 B,4 G 3,3 R 3, Sync ID Payload data Time (ms RGBV 1111 (# (# (#7 The output presents 4 ordered levels each one related with RGBV bit sequences

5 Connected Vehicles Model Generic model for cooperative vehicular communications Vehicles Street lamp 1 i Traffic light VI IV n 3 VV Until recently (VV communication was limited to brake lights, turn signals; (VI was restricted to point detection (loop detectors. Illustration of the proposed IVVI communication scenario: Connected vehicles communication in a crossroad.

6 Lighting plan G 9 R Four modulated LEDs (RGBV located at the corners of a square grid. 7 V Unit cell 3 B G 1,1 R 1, G 1,3 R 1,4 G 1,5 V,1 B, V,3 B,4 V,5 Generated joint footprints G 3,1 R 3, G 3,3 R 3,4 G 3,5 V 4,1 B 4, V 4,3 B 4,4 V 4,5 Promising benefits expected from safety and mobility improvements at the road network G 5,1 R 5, G 5,3 R 5,4 G 5,5

7 IVV system design IV : the street lamp (transmitter sends a message to the SiC receiver, located at the rooftop. VV: the information is resent to a leader vehicle, using the headlights as transmitters,. Transmitter RGB-LED I V Relative speed??? V R Sync. ID [10101] [r r r: c c c] payload data [data transmission] Intensity (a.u B G Wavelength (nm Codeword (RGBV V,3 B,4 G 3,3 Receiver SiC pinpin Time (ms R 3,4 Representation of the IVV communication (working principle for the prototype The structure of the frame is a classical one The message begins with 5 synchronization bits The rest of the frame consists of 6 ID s bits, data bits and stop bit.

8 Cooperative VLC System Evaluation Generalized view of the architecture Operational procedure: Transmitters Receivers V 1 Three different scenarios: Scenario 1 I V V I Scenario I V I Scenario 3 I V V I VI V 3 VV V IV Each vehicle receives two different messages: IV and VV coming from the streetlight and from the follow vehicle; Compare them and infers the drive distance and the relative speed. Send the information to a next car (VVV or to an infrastructure (VVI. In order to verify the system operability and efficiency we have conducted an extensive set of measurements

9 Scenario 1: IVVI V,3 Sync ID Payload data B, 5 G 3,3 R 3, 4 #1 IV RGBV [1111] MUX ( A Time (ms Vehicle 1 sends the request message to the infrastructure (VI and informs the signal controller that this vehicle desires service (often called demand for service. #3 #7 [1010] [0101] G 3,1 R 3, MUX ( A V,1 B, Sync ID Payload data #P1 (W, t Time (ms VV #P7 (W, t 1 Request time: t 1 Dt=. Dv=. Data collected from connected vehicles provides a much more complete picture of the traffic states near an intersection MUX ( A RGBV 1111 #P3 (W, t V 4,3 B 4,4 B, R 3, Sync ID Payload data VI #5 (S, t #3 (W, t Time (ms S W RGBV [1010] [0011]

10 Scenario : IVI V 4,3 B 4,4 5 IV G 3,3 R 3,4 4 Sync #1 ID Payload data RGBV [1111] MUX ( A 3 1 [1100] #9 #5 [0011] Time (ms IV MUX signal received by a rooftop receiver moving in the S direction when the vehicle is located #5 Vehicle sends the request message to the infrastructure (VI and informs the signal controller that this vehicle desires service. Request time: t Dt=. Dv=. MUX ( A V 4,3 B 4,4 B, R 3, Sync ID Payload data VI #5 (S, t #3 (W, t Time (ms S W RGBV [1010] [0011] VI communication from vehicle to the infrastructure

11 Scenario 3: IVVI V,1 B, G 3,1 R 3, 1.0 Sync ID Payload data #P1 (W, t VV RGBV 1111 MUX ( A 0.5 #P7 (W, t 1 #P3 (W, t Time (ms 0101 Pedestrian-only stage (01 phase two single-lane road phases Vehicle 3 sends the request message to the infrastructure (VI and to the leader (VV Request time: t 3 Dt=. Dv=. Vehicle s From a capacity intersection point access of view time is more is efficient, defined if Vehicle as the 3 is time given at which access the before head of Vehicle the vehicle enters the intersection area Phasing of traffic flows

12 Virtual road network: IVVI NETWORK G B R 14 V 1 V 3 V 3 9 R 3 9 G 33 B 4 G 31 R 34 V 43 B 44 G 53 8 R G 35

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14 Horizon 00 Transport virtual info day The event will present the following 019 calls for funding making available a total of nearly 355 million Mobility for Growth Automated Road Transport Green Vehicles Next Generation Batteries

15 Conclusions Light-activated pi n/pin a-sic:h devices combines the demultiplexing operation with the simultaneous photodetection and self amplification. Street lamp Vehicles 1 i Traffic light Connected vehicles information from the network (IV, vehicular interaction (VV and infrastructure (VI is analyzed. IV 3 VV n VI A generic model of cooperative transmissions for vehicular communications services is established. The experimental results, confirmed that the proposed cooperative VLC architecture is appropriate for the control and management of a traffic light controlled crossroad network. Transmitters V 1 VI VV IV Two-level optimization: phase sequence and duration. Receivers V V 3

16 Optical communications strategies Future research directions Examples of visualizations of urban dynamics The Heartbeat of a smarter Society DIGITAL CITY The place for innovation strategies framework product development continued growth even in difficult times -Representation of traffic flows a b -Aggregated data from cell phones during two special event c d