March 2008
Slide 1
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
March 2008
Slide 1
WAVE Enhancement TechnologiesDate: 2008-03-18
Name Affiliations Address Phone email Hyun Seo Oh ETRI 161 Gajeong-dong,
Yuseong-gu, Daejeon, Korea
+82-42-860-5659
Han Berg Cho ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea
+82-42-860-5531
Authors:
March 2008
Slide 2
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
01011001010001
01011001010001
01011001010001
01011001010001
contents
V2V/V2I Service PerspectiveV2V/V2I Service Perspective1111
V2V/V2I Service Use CasesV2V/V2I Service Use Cases2222
Concluding Remarks Concluding Remarks 4444
Key TechnologiesKey Technologies3333
March 2008
Slide 3
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
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
Slide 4
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
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 RSE
Traffic Information
V2V V2I
Hopping
Warning Message
March 2008
Slide 5
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
• Terminal Platform : Telematics/ITS Service Support • Radio Access Integration
- Existing : 2G Cellular, DMB, GPS
- New : DSRC, WPAN, WAVE[V2I, V2V]
셀룰러 DMB
DSRC/WAVE
V2V
GPS
PlatformECU
DMB
2G
DSRCWAVE
GPS
PAN
V2V
Ant.Ant.
March 2008
Slide 6
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
V2V/V2I Service Use CasesWarning 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
March 2008
Slide 7
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
Road/TrafficInformation
Probe data collection
BackboneNetwork
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/TrafficInformation
March 2008
Slide 8
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
• 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
BackboneNetwork
Traffic Information
Center
March 2008
Slide 9
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
RSUAntenna
RoadsideHost
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
March 2008
Slide 10
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
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
Control Data 1
Traffic Data 1 Traffic Data n
Control Data n1f
2f
Control Data 1Tx Packet Traffic Data 1
Channel Switching Guard Time
Control Data n Traffic Data n
Time
Control Data 1 Traffic Data 11f Control Data n Traffic Data n
Control Data 1Tx Packet Traffic Data 1 Control Data n Traffic Data n
WAVE control and traffic channel operation
TDM channel operation
March 2008
Slide 11
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
Preamble Payload MidamblePayload Payload Payload Midamble Payload Payload
Channelestimation
Equalizer
ChannelEstimation& Update
Equalizer
ChannelEstimation& Update
Equalizer
N symbol
Preamble Payload···
Payload Payload···
Payload Payload Payload
Channelestimation
Equalizer
···
Preamble
Midamble
∙∙∙ ∙∙∙ ∙∙∙
0 5 10 15 20 25 3010
-7
10-6
10-5
10-4
10-3
10-2
10-1
100
SNR(dB)
BE
R
16QAM - 50km/h
Preamble 150byte (No tracking)
Preamble 500byte (No tracking)
Preamble 1000byte (No tracking)Midamble 1000byte
Pilot 1000byte
0 5 10 15 20 25 30
10-4
10-3
10-2
10-1
100
SNR(dB)
BE
R
Channel tracking(16QAM)- Midamble vs. Pilot
Midamble-50km/h
Midamble-100km/hMidamble-150km/h
Midamble-200km/h
Pilot - 50km/h
Pilot - 100km/hPilot - 150km/h
Pilot - 200km/h
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
March 2008
Slide 12
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
BPSKQPSK16QAM64QAM
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
March 2008
Slide 13
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
Key Technologies
Time
Amplitude
Control Channel Service Channel
Data ACKRequest Confirm
OFDMMulticarrier CDMA
C1
C0
Cn
C1
C0
Cn
f0f1
fn
fn-1
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
March 2008
Slide 14
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
Controlslot
serviceslot#n
frame
Beaconslot
Serviceslot#1
Controlslot
serviceslot#n
frame
Beaconslot
Serviceslot#1
time
DATA ACK RTS CTS DATA ACKtime
RTS CTS
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
March 2008
Slide 15
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
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
AntennaBeam
Processing
Antenna A
Antenna B
Antenna C
Antenna D
Antenna Operation • Rx : 4 antennas On • Tx : one antenna On
March 2008
Slide 16
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
car4
car1car9
car5car8
car3
car2car7
car6
Location Information
Location Information
Internet
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
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
March 2008
Slide 17
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
up to 100 m
Vehicle w/OBU
RSU Antenna
Emergency Vehicle with OBU
Vehicle 2Vehicle 1
Traffic Signal
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
March 2008
Slide 18
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
• 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
March 2008
Slide 19
doc.: IEEE 802.11-08/0361r0
Submission Hyun Seo Oh, ETRI
• 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