DSRC at 5.9GHZ

老師 :高永安學生 :楊智安

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 )

Comparison with existing DSRC

SPECTRUM USED

DATA RATE

COVERAGE

ALLOCATION STATUS

INTERFERENCE POTENTIAL

MAXIMUM RANGE

MINIMUM SEPARATION

CHANNEL CAPACITY

12 MHz (909.75 to 921.75 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 - 27 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

902 - 928 MHz BandPARAMETERS 5850 - 5925 MHz Band

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

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

ex: DRIVE-THRU PAYMENT PARKING LOT PAYMENT DATA TRANSFER / INFO FUELING--REPAIR-SERVICE RECORD

VEHICLE COMPUTER PROGRAM UPDATES MAP and MUSIC DATA UPDATES VIDEO UPLOADS …..

Applications (by range)

DSRC Performance envelopes

Range (ft)

10

00

12

00

14

00

16

00

18

00

20

00

22

00

24

00

26

00

28

00

30

00

32

00

34

00

36

00

20

0

40

0

60

0

80

0

Da

ta R

ate

(Mb

ps)

33

30

27

24

21

18

12

9

6

3

0

54~

~

0.5 Mbps

902 - 928 MHz Band Performance Envelope

5850 - 5925 MHz BandPerformance Envelope

Emergency Vehicle ServicesSafety Message Services

Data Transfer and Internet Access Services

Toll and Payment Services

(Approximate)

Why 802.11a ?

High data rate Very short latency (<50ms) impact on MAC

layer Compatibility Economic feasibility

DSRC Ad Hoc Mode

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