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

2. contents V2V/V2I Service Perspective 1 V2V/V2I Service Use Cases 2 3
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contents
V2V/V2I Service Perspective 1
V2V/V2I Service Use Cases 2
Key Technologies 3
Concluding Remarks 4

3. V2V/V2I Service Perspective
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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. March 2008 V2V V2I V2V Communication : Vehicle Multi-hop Networking
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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

5. Terminal Platform : Telematics/ITS Service Support
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Terminal Platform : Telematics/ITS Service Support
Radio Access Integration
- Existing : 2G Cellular, DMB, GPS
- New : DSRC, WPAN, WAVE[V2I, V2V]

6. V2V/V2I Service Use Cases
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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

7. Traffic Information Center
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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

8. Traffic Information Center
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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. Traffic Management Center Server/
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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

10. TDM Operation for Control and Service Channel
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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. Continuous Channel Estimation in Vehicle Mobility
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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
∙∙∙
∙∙∙
∙∙∙

12. Adaptive Rate Control for vehicle radio channel
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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. Key Technologies March 2008 Multi-Carrier for Safety Warning Messages
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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. CSMA/CA-TDMA combined MAC with priority control
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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. Directional Beam Switching
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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. Position based routing for low multi-hop delay
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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. - 2 RF channel assignment for V2V/V2I
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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

18. Packet Communication Procedures
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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

19. Concluding Remarks March 2008
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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