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 PARAMETERS 902 - 928 MHz Band 5850 - 5925 MHz Band 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

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 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 54 ~ ~ 33 30 Data Transfer and Internet Access Services 27 5850 - 5925 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 902 - 928 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)

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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