The Role and Design of Communications for Automated Driving
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1 The Role and Design of Communications for Automated Driving Gaurav Bansal Toyota InfoTechnology Center, USA Mountain View, CA ETSI ITS Workshop 2015 March 27,
2 V2X Communication Sensor Automated Car V2X Communication V2X Communications can be very important sensor for automated driving. It can provide collaborated driving, long range and non line-of-sigh capability to automated car. 2
3 Communication Advantages Much more precise data exchanged Range = 100s meters Communicate with non-nearest neighbors Non-line-of-sight capability 360 degrees with one device Communication and Sensors are complementary 3
4 Main Idea: Automated Driving Communications Automated car should not only transmit its own information (as in V2X safety communications), Also transmit other object information Cars, pedestrians, potholes, signs etc.. Notices on the map using its local sensors (camera, radar, lidar etc.) 4
5 Proposed System Model Communication should collaborate with other sensors (cameras, radars etc.) in building the real-time map of the road 5
6 Proposed System Model CSAM: Cooperative Situational Awareness Message Latest map information collected by Radar, Camera etc., and communication messages received over-the-air 6
7 Present day Communication Technology We set-up NS-3 simulations Total length of the highway = 4Km Number of Cars on the road = 100 per Km Power =~ 500 m transmission range (in ns3 simulator) Message rate = 10 Hz Packet size: V2X safety message = 350 Bytes Automated driving message = x*50 bytes x represents how many other objects vehicle is observing from local sensors 50 Bytes represent an estimate of object information 7
8 Numerical Results CBP = Channel Busy Percentage (a measure of wireless channel load) Channel Busy Percentage (in %) Channel saturated is Packet Size = 350 Bytes; x = 0 Packet Size = 2350 Bytes; x = 40 8
9 Communication Module Data to Be Broadcast Data From Other Vehicles Network Performance Feedback Communication Module Multi Resolution Data Processing (MRDP) Module Communication Rate Communication Power Message Content Innovative solutions for setting power, message rate, message content are required 9
10 MRDP Control Strategies Control strategies of MRDP module Rate-control schemes Range-control schemes Content-control schemes Less congestion broadcast a higher-resolution map Enhance both temporal and spatial accuracy of the map Ideally a combination of joint message content, rate, and power (or range) control such that all three parameters are dynamically adapted to control the channel load. Our Current Focus: Fix Message rate and transmit power. Adapt the content of automated driving message. 10
11 Adaptive Content Control Message size is derived so that the measured load of the network remains within a desirable range. Determine the number of known and unknown objects Distance-sensitive forwarding: For a fixed message size, the content of the message is chosen probabilistically Information of objects closer to the sender are included in the message with a higher probability. Don't re-transmit the data for objects that has been recently broadcasted on the channel 11
12 Results Car Density = 125 vehicles/km Superior Performance Information age is measure of how quickly automated car knows about the changes on the map Should be further optimized with joint rate, power and content control Message Size and Content Adaptation for Object Mapping in Cooperative Automated Vehicles Fanaei, Tahmasbi-Sarvestani, Fallah, Bansal, Shimizu, Valenti To be submitted to IEEE Transactions on Intelligent Transportation Systems April The Role and Design of Communications for Automated Driving Bansal, Fallah, Fanaei, Tahmasbi-Sarvestani, Kenney, Valenti Automated Vehicles Symposium July
13 Conclusions V2X is revolutionary the next frontier for wireless. We ve come a long way in technical areas feasibility and basic technology now pretty mature Challenges include security, positioning, scalability, and evolution Communications can play an important role in automated driving Innovative algorithms for automated driving communications are required 13
14 Questions? 14
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