WAVE Enhancement Technologies March 2008March 2008 March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 March 2008 WAVE Enhancement Technologies Date: 2008-03-18 Authors: Slide 1 Stephen McCann, Nokia Siemens Networks

contents V2V/V2I Service Perspective 1 V2V/V2I Service Use Cases 2 3 March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 contents V2V/V2I Service Perspective 1 01011001010001 100100100001111010011100110000110100101011001010010100100100 V2V/V2I Service Use Cases 2 Key Technologies 3 Concluding Remarks 4

V2V/V2I Service Perspective March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

March 2008 V2V V2I V2V Communication : Vehicle Multi-hop Networking March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 V2V Communication : Vehicle Multi-hop Networking V2I Communication : Bi-directional Packet Communication Cellular/WiBro TSP Server GPS Internet RSE RSE Emergency Message LBS와 관련 기술에 대한 다양한 자료 조사를 통해 대표적인 서비스 측면에서의 발전 동향과 기술 측면에서의 발전 동향을 정리 Warning Message Warning Message V2V Probe Data V2I Traffic Information Accident Hopping

Terminal Platform : Telematics/ITS Service Support March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 Terminal Platform : Telematics/ITS Service Support Radio Access Integration - Existing : 2G Cellular, DMB, GPS - New : DSRC, WPAN, WAVE[V2I, V2V]

V2V/V2I Service Use Cases March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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 LBS와 관련 기술에 대한 다양한 자료 조사를 통해 대표적인 서비스 측면에서의 발전 동향과 기술 측면에서의 발전 동향을 정리

Traffic Information Center March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 Probe data collection/Traffic information RSE collects probe data from the vehicle periodically and provides traffic and road status information to vehicles Probe data collection Road/Traffic Information Traffic Backbone Network Traffic Information Center Probe Vehicle LBS와 관련 기술에 대한 다양한 자료 조사를 통해 대표적인 서비스 측면에서의 발전 동향과 기술 측면에서의 발전 동향을 정리 Road/Traffic Information

Traffic Information Center March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

Traffic Management Center Server/ March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 Key Technologies Traffic Management or Other Center Basic Requirement Packet Latency : < 100msec Packet Length : ~ 1kbytes Networking : V2I or VANET Traffic Management Center Server/ Network Interface ITS/Telematics Application RSU Antenna Two-way RF Internet or Private Network Roadside Unit (RSU) Roadside Host Processor and Backhaul Equipment Inside Equipment Cabinet

TDM Operation for Control and Service Channel March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

Continuous Channel Estimation in Vehicle Mobility March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 Continuous Channel Estimation in Vehicle Mobility . Conventional : Preamble/Pilot Sub-carriers based Channel Estimation . New : Mid-amble based Channel Estimation Preamble Preamble Payload ··· Channel estimation Equalizer Midamble Preamble Payload Midamble Channel estimation Equalizer Estimation & Update N symbol ∙∙∙ ∙∙∙ ∙∙∙

Adaptive Rate Control for vehicle radio channel March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

Key Technologies March 2008 Multi-Carrier for Safety Warning Messages March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

CSMA/CA-TDMA combined MAC with priority control March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

Directional Beam Switching March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

Position based routing for low multi-hop delay March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 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

- 2 RF channel assignment for V2V/V2I March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 V2V/V2I Communication Service - 2 RF channel assignment for V2V/V2I - Multi-channel Operation & Management Vehicle 1 Vehicle 2 Traffic Signal up to 100 m Traffic Signal RSU on Service Ch 174 Details of the Communication Zones for the outlined area are on the next slide Intersection Collision Avoidance System Equipment Cabinet RSU Antenna Vehicle w/OBU Off-center Mounted RSU Horizontal Antenna Pattern Emergency Vehicle with OBU

Packet Communication Procedures March 2008March 2008 doc.: IEEE 802.11-08/0385r0 March 2008 Packet Communication Procedures V2V/V2I Channel Switching & Multi-channel MAC - RF channel switching for single receiver - Simultaneous message reception for two channel receivers Packet Vehicle 1 Vehicle 2 Base Station Beacon Contention problem between V2V & V2I radio access Probe Data ACK Warning Message Request Reply Data ACK

Concluding Remarks March 2008 March 2008March 2008 doc.: IEEE 802.11-08/0385r0 Concluding Remarks March 2008 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