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Dedicated Short Range Communication. What is DSRC?. A short to medium range communications service Aimed as a replacement to the 802.11 wireless standards 802.11 a – Operates at 5 GHz

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Dedicated Short Range Communication

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Dedicated short range communication l.jpg

Dedicated Short Range Communication


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What is DSRC?

  • A short to medium range communications service

  • Aimed as a replacement to the 802.11 wireless standards

    • 802.11 a – Operates at 5 GHz

    • 802.11 b/g – Operates at 2.4 GHz – Bandwidth of (11 / 52 Mbps respectively) – Interference with Microwave/Bluetooth

  • Older DSRC systems such as toll tags operate in the 900 MHz spectrum

    • No standard, several proprietary systems are in place

  • FCC has authorized 75 MHz of spectrum from 5.850 to 5.925 GHz for DSRC (incl. Canada and Mexico)

    • Standardization, Interoperability

    • Europe and Japan use the 5.8 GHz spectrum

    • European organization – CEN – Different Physical and MAC layer standards

    • Japan – ARIB T55


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DSRC Overview

  • Supports both Public Safety and Private operations

  • Both roadside to vehicle and vehicle to vehicle communication environments

  • Meant to be a complement to cellular communications

    • provides very high data transfer rates and minimal latency

    • Range – upto 1000 m

    • Data Rate – 6 to 27 Mbps

    • Channels – 7 Licensed Channels


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DSRC

  • Key Issue – QoS – Prioritization of Safety messages

  • If a neighboring car is in the middle of a streaming movie application, and I need to communicate about an accident, how to prioritize the message?

  • DSRC has 1 control channel and other service channels. Safety messages are expected to use the control channel


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DSRC Overview

  • ASTM 17.51 – the DSRC Standards Committee

  • Underlying radio technology for DSRC applications

    • 802.11a – Originally proposed standard

    • 802.11p – aka Wireless Access for the Vehicular Environment (WAVE)

      • defines enhancements to 802.11 required to support Intelligent Transportation Systems (ITS) applications

      • Formal standard is scheduled to be published in Jan 2007


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Alternatives to 802.11p

  • 802.20 - http://www.ieee802.org/20/

    • Different Frequency band – 3.5 Ghz

    • Designed for mobile broadband wireless access systems

    • Optimized for IP-data transport

    • Supports mobility upto 250 kmph

    • Peak data rate per user > 1 Mbps

  • 802.16 – WiMAX – MAN (Point to Multipoint)

  • 802.15 – PANs (Bluetooth, ZigBee)


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ISO TC204 WG16 CALM M5 Architecture


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DSRC Protocol Stack

  • P1609.1, Resource Manager

  • P1609.2, Application Services

  • P1609.3, IP Network Services

  • P1609.4, Medium Access Control (MAC) Extension Services

  • [Vehicle Safety Data Dictionary/Message Sets (SAE)]


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IEEE P1609.1 Scope

  • Modified version of the Resource Manager standard originally defined in IEEE Std 1455-1999

  • P1609 Resource Manager supports DSRC applications using the IEEE 802.11a communication technology


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IEEE P1609.2 Scope

  • An Application Services (Layer 7) standard for 5.9 GHz DSRC applications

  • Supports several protocol stacks, including one representing traditional DSRC systems, TCP/IP, and streaming audio/video

  • Describes interfaces with the lower layer standards being developed by ASTM


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IEEE P1609.3 Scope

  • Defines interfaces between the multiple communication stacks and the lower layer services of ASTM 2213-02 (IEEE 802.11a R/A)

  • Support multiple protocol stacks, one for the traditional DSRC, one for streaming audio/video, and another for TCP/IP

  • The North American DSRC Architecture is evolving


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IEEE P1609.4 Scope

  • Standard for the Media Access Control Extension sub-layer (Layer 2) that defines interfaces between these multiple applications and communication stacks that interface with ASTM 2213-02 (IEEE 802.11a)

  • Interface with the public safety applications community through National Public Safety Telecommunication Council (NPSTC)

  • NPSTC cooperation is expected to result in potential use of the ITS Radio (DSRC) by ITS and public safety


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IEEE DSRC DD/MST

  • Standardization of the Data Dictionary and Message Set (DD/MS) definitions

  • DD/MST was present in IEEE Standard 1455-1999, being ported to 5.9 GHz DSRC standards

  • Auto manufacturers - on-board vehicle safety messages – need for standardization


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References

  • DSRC

    http://www.leearmstrong.com/DSRC/DSRCHomeset.htm

  • IEEE 802.11 Task Group status

    http://grouper.ieee.org/groups/802/11/Reports/tgp_update.htm

  • AMI-C

    http://www.ami-c.org

  • NPSTC

    http://www.npstc.org


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Brake-light communication system

  • Related work

    • Performance Evaluation of Safety Applications over DSRC Vehicular Ad Hoc Networks , VANET 2004. Based on simulations, no real hardware.

    • Few other papers from PATH, Europe, etc.


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