1. DSRC at 5.9GHZ
老師:高永安
學生:楊智安

2. Several types of DSRC 915MHz DSRC(北美)
5.8 GHZ DSRC –use ASK ,PSK modulation
(歐洲, 日本, 中國…)
5.9 GHZ DSRC –802.11a(北美)

3. Comparison with existing DSRC
PARAMETERS
MHz Band
MHz Band
SPECTRUM USED
DATA RATE
COVERAGE
ALLOCATION STATUS
INTERFERENCE POTENTIAL
MAXIMUM RANGE
MINIMUM SEPARATION
CHANNEL CAPACITY
12 MHz ( to MHz)
0.5 Mbps
One communication zone at a time
No protection
Many 900 MHz Phones,
Many Rail Car AEI Readers,
Many Spread Spectrum Devices,
Wind Profile Radars
300 ft (at required- 30 dBm sensitivity)
1500 ft (except where carefully planned)
1 to 2 channels
75 MHz
6 Mbps Mbps
Overlapping communication zones
Primary Status (high protection)
Sparsely located Military Radars,
Very Sparsely located Satellite Uplinks
1000 m (~ 3000 ft)
50 ft (on small zone channels)
7 channels

4. Comparison with existing DSRC
915MHZ—
Designed for ETC, but can be used for other applications
5.9GHZ---
Designed for general internet access, can be used for ETC
etc:electronic toll collection

5. Applications
Public Safety– implementation of a DSRC service by government
ex:
APPROACHING EMERGENCY VEHICLE (WARNING) ASSISTANT EMERGENCY VEHICLE SIGNAL PREEMPTION
ROAD CONDITION WARNING
LOW BRIDGE WARNING
WORK ZONE WARNING
IMMINENT COLLISION WARNING ….
Private-- implementation of a DSRC service to transfer data to and from individual or business owned device
DRIVE-THRU PAYMENT
PARKING LOT PAYMENT
DATA TRANSFER / INFO FUELING--REPAIR-SERVICE RECORD
VEHICLE COMPUTER PROGRAM UPDATES
MAP and MUSIC DATA UPDATES
VIDEO UPLOADS
…..

6. Applications (by range)

7. DSRC Performance envelopes54 ~ ~ 33 30
Data Transfer and Internet Access Services 27
MHz Band
Performance Envelope 24
Data Rate (Mbps)
(Approximate) 21 18 12
Emergency Vehicle Services
Safety Message Services 9 6 3
Toll and Payment Services
MHz Band Performance Envelope
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
0.5 Mbps
Range (ft)

8. Why a ?
High data rate
Very short latency (<50ms) impact on MAC layer
Compatibility
Economic feasibility

9. DSRC Ad Hoc Mode

10. ~~ end ~~