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��Wireless Communication Technologies �for Effective Traffic Monitoring: �Analysis Existing & Exploring Latest�Communication Devices�

October 10, 2024

Presented at the 2024 ITS Arizona Conference

​

Pramesh Pudasaini, PhD Candidate

Henrick Haule, PhD

Yao-Jan Wu, PhD, PE

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Communication & Traffic Monitoring

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Fiber optic cables

  • Industry standard
  • Limited coverage

Communication

breaks & gaps

Wireless devices

  • Cost effective
  • Quicker deployment
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Project Objectives

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Goals

1) Evaluate existing communication systems

2) Review latest wireless products

  • Literature review
  • Technical review
  • Data collection
  • Performance analysis

Outcome

1) Identify critical areas and nodes

2) Select products for installation

Communication status in City of Phoenix network

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Communication Performance

Product selection factors

  • Performance-related
    • Modulation rate
    • Line of sight
    • Transmission power
    • Distance between nodes
  • Reliability & cost

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Performance Measures

  • Saturated throughput
  • Latency
  • Packet delivery ratio
  • Signal-to-noise ratio
  • Received signal indicator strength
  • Zhou, Y., et al. (2017). "Process for evaluating the data transfer performance of wireless traffic sensors for real‐time intelligent transportation systems applications." IET Intelligent Transport Systems 11(1): 18-27.
  • Zhou, Y., et al. (2011). "Wireless communication alternatives for intelligent transportation systems: a case study." Journal of Intelligent Transportation Systems 15(3): 147-160.

Zhou et al., 2011, 2017

Zhou et al., 2017

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Technical Review of Wireless Products

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Wireless Products

  • 9 products reviewed from 6 vendors
  • Technical factors
    • Communication distance
    • Communication protocols (802.11)
    • Operational parameters
  • Selection factors
    • Cost
    • Vendor responsiveness

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Technical Specification Review

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3 wireless communication radios selected

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Study Sites & Data

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Study Areas & Nodes

SouthWest

Kierland

Thomas

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Communication Performance Data

  • Data collection: Jan 1-25, 2024
  • Performance measures
    • Throughput: upload/download speed
    • Latency
    • Packet loss
  • Variables
    • 2.4/5.8 GHz noise
    • Tx/Rx rate
    • 2.4/5.8 GHz airtime total
    • 2.4 GHz routed clients
    • Hop count

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Performance Analysis

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Throughput Analysis�Upload Speed (Mbps)

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Latency Analysis

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Packet Loss Analysis

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Correlation Analysis�Performance Measures & Variables

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Kierland Area

SouthWest Area

Thomas Area

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Comparison Across Nodes

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Performance

Measures

Environmental

Noise

Network

Efficiency

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Conclusions

  • Products selected for testing
  • Ranking areas by performance
    • Thomas, Southwest, Kierland
    • Kierland: high variability in noise interference
    • SouthWest: less efficient routing
      • Data packets traverse more hop devices
  • Areas and nodes identified for radio replacement

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Thank you

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https://appliedtransportation.arizona.edu/

Pramesh Pudasaini

Henrick Haule

Yao-Jan Wu

(520) 999-5043

(904) 440-3371

(520) 621-6570

pramesh@arizona.edu

hhaule@arizona.edu

yaojan@arizona.edu

www.yaojan.org

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