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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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Presentation Transcript
what is dsrc
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
dsrc overview
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
slide4
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
dsrc overview5
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
alternatives to 802 11p
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)
dsrc protocol stack
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)]
ieee p1609 1 scope
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
ieee p1609 2 scope
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
ieee p1609 3 scope
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
ieee p1609 4 scope
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
ieee dsrc dd mst
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
references
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

brake light communication system
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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