Doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 1 March 2008 Slide 1 WAVE...

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

[email protected]

Han Berg Cho ETRI 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea

+82-42-860-5531

[email protected]

Authors:

March 2008

Slide 2

doc.: IEEE 802.11-08/0361r0


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


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

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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

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doc.: IEEE 802.11-08/0361r0


• 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

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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

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doc.: IEEE 802.11-08/0361r0


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

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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

BackboneNetwork

Traffic Information

Center

March 2008

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doc.: IEEE 802.11-08/0361r0


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

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doc.: IEEE 802.11-08/0361r0


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

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doc.: IEEE 802.11-08/0361r0


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

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doc.: IEEE 802.11-08/0361r0


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

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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

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doc.: IEEE 802.11-08/0361r0


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


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

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doc.: IEEE 802.11-08/0361r0


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

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doc.: IEEE 802.11-08/0361r0


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

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doc.: IEEE 802.11-08/0361r0


• 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

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doc.: IEEE 802.11-08/0361r0


• 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

Doc.: IEEE 802.11-08/0361r0 Submission Hyun Seo Oh, ETRI March 2008 Slide 1 March 2008 Slide 1 WAVE...

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