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Wireless Communications for Freeway Management: A Case Study

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Title: Wireless Communications for Freeway Management: A Case Study


1
Wireless Communications for Freeway
Management A Case Study
  • Presented by
  • Rodney Chester, P.E.
  • Gresham, Smith and Partners
  • ITSGA/TSITE Joint Meeting
  • Chattanooga, TN
  • September 25, 2006

2
Outline of Presentation
  • Overview of TDOTs Statewide ITS Program
  • Overview of Memphis Smartway System
  • Wireless Applications
  • Early Deployment Project
  • Memphis Smartway Project
  • Memphis to Jackson Wireless Backbone
  • Lessons Learned
  • Summary

3
TDOTs ITS Program
4
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5
Overview of Memphis Smartway System

6
Overview of Memphis Projects
  • System includes 2 separate projects
  • Early Deployment Project
  • Memphis Smartway Project
  • Design began Fall 2003
  • Design team is Gresham, Smith and Partners and
    URS.

7
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8
Overview of Early Deployment Project

9
Overview of Devices
10
Early Deployment Project
  • Focused around the I-40 and I-55 Mississippi
    River Bridges (116,000 ADT)
  • Includes 25 CCTV Cameras and 3 DMS
  • Communications is all digital microwave wireless
  • Construction began August 2004
  • Construction Complete June 11, 2005

11
Types of Wireless
  • Individual Device Links
  • 5.8 GHz, Point-to-multipoint, unlicensed links,
    20-60 Mbps, Proxim Tsunami
  • Base station to Base Station Links
  • 23 GHz, point-to point, licensed links, redundant
    45 Mbps, Proxim Tsunami, 2 dishes
  • 10-Mile Trunk Link
  • 11 GHz, point-to-point, licensed links, redundant
    155 Mbps, Nera, 4 dishes

12
Early Deployment Project Limits
13
Early Deployment Project
14
Early Deployment Project
15
Early Deployment Project
16
I-55 Weigh Station 100 Tower
17
I-40 Weigh Station 100 Tower
18
State Office Building 13 story
19
Help Dispatch Tower 150
20
Individual Devices
21
Why wireless?
  • Location
  • Many devices are in another state (Arkansas), not
    as much control/protection for underground
    facilities
  • Control Center location is 10 miles from project
    limits
  • Availability of large buildings downtown
  • Very flat terrain
  • Schedule
  • Purpose of Early Deployment Project was to get
    something installed quickly.

22
Why wireless?
  • Costs
  • Fiber/conduit estimated costs 3 Million
  • 2 million within project limits
  • 1 million to the control center
  • Wireless System Costs 800K
  • Large, redundant 155Mbps link from downtown to
    control center 130K
  • Fiber lease costs for this one link would have
    been 45K per year
  • Link pays for itself in less than 3 years

23
Memphis Smartway Project

24
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25
Memphis Smartway Project
  • 83 Mile Project
  • One of the largest single contract ITS Projects
    in the United States.
  • Will add more devices to the existing wireless
    network.
  • Will also utilize a TDOT-owned fiber optic
    network in the non-wireless locations
  • Entire system is too large of a network to
    efficiently use wireless everywhere
  • New TMC will be constructed

26
Overview of Devices
27
Memphis Smartway Project
  • Dynamic Message Signs
  • 39 additional for total of 42
  • CCTV Cameras
  • 90 additional for total of 115
  • Detectors
  • 354 detectors, mostly radar with some video
  • Highway Advisory Radio
  • Full coverage, approx. 16 units with
    42 HAR Signs

28
Memphis Smartway Project Schedule
  • Bid Date June 3, 2005
  • Project Completion March 2008

29
Memphis to Jackson Wireless Backbone

30
Purpose of the Link
  • Connects the Memphis Smartway system to the TDOT
    Region 4 offices in Jackson, Tennessee
  • Provides additional voice and data radio
    communications for the TDOT Wireless Systems
    section
  • Provides additional capacity for uses by other
    State of Tennessee agencies
  • Serves as the first leg of a future statewide
    wireless network

31
Path Details
  • 66 mile path utilizing 5 hops
  • Longest hop is 33 miles

32
Path Details
  • Utilizes 4 existing towers
  • Replaces one 340 tower with a 410 tower
  • Includes new 150 tower at Region 4 office in
    Jackson
  • Provides new hub buildings for the equipment at 5
    sites

33
Equipment Details
  • Wireless links will be digital microwave OC-3/155
    Mpbs bandwidth
  • 6 Ghz and 11 Ghz frequencies
  • Combination of Ethernet and T1 configurations
  • Designed for future expansion of additional OC-3
    increments.

34
Why Wireless?
  • Cost
  • Estimated Wireless Cost
  • Equipment 1.5 Million
  • Towers Hubs 500K
  • Total 2 Million
  • Estimated Fiber Cost 7 Million

35
Why Wireless?
  • Additional Uses
  • TDOT Wireless Systems (voice and data)
  • Other State Agencies
  • First phase of statewide wireless system
    connecting the four major cities (634 miles)

36
Lessons Learned
  • Unlicensed links require multiple frequency tests
    before, during and after installation.
  • Point-to-point links are often better than
    point-to-multipoint where interference is
    present.
  • Redundancy is a must. Design the system to
    accommodate single failures.
  • Tower sites are prime locations for lightning
    strikes.
  • Maintain sufficient spare parts inventory to
    account for multiple device failures.

37
Summary
  • TDOT utilizes a wide range of communications in
    the ITS program including wireless, fiber and
    leased lines.
  • Wireless is used when it makes the most sense
    based on
  • Location
  • Specific Application
  • Schedule
  • Cost
  • Additional Uses

38
QUESTIONS?
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