1. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 1 March 2008 Slide 1 WAVE Enhancement Technologies Date: 2008-03-18 Authors:

2. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 2 01011001010001 contents V2V/V2I Service Perspective 11 V2V/V2I Service Use Cases 22 Concluding Remarks 44 Key Technologies 33

3. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 3 V2V/V2I Service Perspective Telematics Service will be developed into next-generation Navigation, Safety, Convergence & Infotainment Services - Next-generation Navigation : Navigation by using 3D and Situation aware technology - Safety : Anti-collision and safety service in intersection road - Convergence : Vehicle management and related services - Infotainment 서비스 : Content download service such as movie and music V2V/V2I Communication Technology - V2V Multi-hop Communication : Safety, Group communication - V2I Communication : Convergence, Infotainment service

4. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 4 V2V Communication : Vehicle Multi-hop Networking V2I Communication : Bi-directional Packet Communication Accident GPS Emergency Message Warning Message Cellular/WiBro Probe Data TSP Server Internet RSE Traffic Information V2V V2I Hopping Warning Message

5. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 5 Terminal Platform : Telematics/ITS Service Support Radio Access Integration - Existing : 2G Cellular, DMB, GPS - New : DSRC, WPAN, WAVE[V2I, V2V]

6. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 6 V2V/V2I Service Use Cases Warning Message Broadcasting Detect accident or road status in real time & broadcast warning message to the following vehicle by using vehicle to vehicle multi-hop communication Vehicle 1 Vehicle 2 Vehicle 3 ② ① ③

7. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 7 Road/Traffic Information Probe data collection Backbone Network Traffic Information Center Probe Vehicle Traffic Probe data collection/Traffic information RSE collects probe data from the vehicle periodically and provides traffic and road status information to vehicles Road/Traffic Information

8. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 8 Communication Technology Requirements to meet V2V/V2I Services –Communication Type : V2I( Broadcasting, 1:1, 1:N) or VANET –Mobility : Max. 200 km/h - Packet Latency : < 100 msec –Long packet transmission : 1kbytes –Capacity : approximately 120 vehicles/300 m cell coverage Backbone Network Traffic Information Center

9. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 9 RSU Antenna Roadside Host Processor and Backhaul Equipment Inside Equipment Cabinet Traffic Management or Other Center Internet or Private Network Traffic Management Center Server/ Network Interface Two-way RF Basic Requirement Packet Latency : < 100msec Packet Length : ~ 1kbytes Networking : V2I or VANET ITS/Telematics Application Roadside Unit (RSU) Key Technologies

10. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 10 TDM Operation for Control and Service Channel RF channel switching needs to have guard time to be order of at least 10 usec TDM will be more efficient scheme to eliminate guard time TDM Operation for Control and Service Channel RF channel switching needs to have guard time to be order of at least 10 usec TDM will be more efficient scheme to eliminate guard time WAVE control and traffic channel operation TDM channel operation

11. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 11 PreamblePayloadMidamblePayload MidamblePayload Channel estimation Equalizer Channel Estimation & Update Equalizer Channel Estimation & Update Equalizer N symbol PreamblePayload···Payload ···Payload Channel estimation Equalizer ··· Preamble Midamble ∙∙∙ Continuous Channel Estimation in Vehicle Mobility. Conventional : Preamble/Pilot Sub-carriers based Channel Estimation. New : Mid-amble based Channel Estimation Continuous Channel Estimation in Vehicle Mobility. Conventional : Preamble/Pilot Sub-carriers based Channel Estimation. New : Mid-amble based Channel Estimation

12. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 12 Adaptive Rate Control for vehicle radio channel Received signal is closely related to the Distance and Fading Rate Adaptive Modulation selection will improve the overall throughput rate in radio cell for example, 64QAM, 16QAM, QPSK, BPSK are selected according to RSSI Adaptive Rate Control for vehicle radio channel Received signal is closely related to the Distance and Fading Rate Adaptive Modulation selection will improve the overall throughput rate in radio cell for example, 64QAM, 16QAM, QPSK, BPSK are selected according to RSSI

13. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 13 Key Technologies Multi-Carrier for Safety Warning Messages Vehicles may generate simultaneously Warning Messages in its generation or multi-hop relay Multi-carrier CDMA(CDMA and OFDM combined) will give reliable transmission because performance will be improved by processing margin Multi-Carrier for Safety Warning Messages Vehicles may generate simultaneously Warning Messages in its generation or multi-hop relay Multi-carrier CDMA(CDMA and OFDM combined) will give reliable transmission because performance will be improved by processing margin

14. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 14 CSMA/CA-TDMA combined MAC with priority control CSMA/CA has throughput degradation as the number of users are increasing and packet latency will be over the time limit of warning messages CSMA/CA-TDMA combined MAC will guarantee packet latency due to time slot scheduling CSMA/CA-TDMA combined MAC with priority control CSMA/CA has throughput degradation as the number of users are increasing and packet latency will be over the time limit of warning messages CSMA/CA-TDMA combined MAC will guarantee packet latency due to time slot scheduling

15. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 15 Directional Beam Switching Omni-directional antenna for control channel operation, Directional antenna for service channel operation Directional antenna will reduce the total interference in VANET Directional Beam Switching Omni-directional antenna for control channel operation, Directional antenna for service channel operation Directional antenna will reduce the total interference in VANET Antenna Operation Rx : 4 antennas On Tx : one antenna On

16. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 16 Position based routing for low multi-hop delay Location information can be gathered and provided by Location Service Routing delay will be minimized if source terminal will know the destination address and optimal path by the assistance of location server Position based routing for low multi-hop delay Location information can be gathered and provided by Location Service Routing delay will be minimized if source terminal will know the destination address and optimal path by the assistance of location server

17. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 17 up to 100 m Vehicle w/OBU RSU Antenna Emergency Vehicle with OBU Vehicle 2 Vehicle 1 Traffic Signal Intersection Collision Avoidance System Equipment Cabinet Off-center Mounted RSU Horizontal Antenna Pattern Details of the Communication Zones for the outlined area are on the next slide RSU on Service Ch 174 V2V/V2I Communication Service - 2 RF channel assignment for V2V/V2I - Multi-channel Operation & Management V2V/V2I Communication Service - 2 RF channel assignment for V2V/V2I - Multi-channel Operation & Management

18. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 18 Packet Communication Procedures Packet Vehicle 1 Vehicle 2 Beacon Base Station V2V/V2I Channel Switching & Multi-channel MAC - RF channel switching for single receiver - Simultaneous message reception for two channel receivers V2V/V2I Channel Switching & Multi-channel MAC - RF channel switching for single receiver - Simultaneous message reception for two channel receivers Warning Message Probe Data Reply Contention problem between V2V & V2I radio access ACK Request Data ACK

19. doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 19 Telematics Service will be categorized into –V2V based Vehicle Safety Service : Intersection Collision Avoidance –V2I bases Convergence Service : ITS/Telematics/USN Convergence Service V2V/V2I Communication has basic requirements –High Mobility : 200 Km/h –Low Latency : <100 msec –Multi-channel V2V/V2I MAC –Real Time Multi-hop Routing WAVE enhancement or New Challenging Technologies -Need more revisions on the key technologies to meet basic requirement -New Candidate Technologies ; TDM vs. Channel Switching, Channel estimation for long packet, Adaptive rate control, Multi-carrier CDMA, CSMA/CA-TDMA combined MAC, Directional Beam Switching, Position based routing Concluding Remarks