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Wi-HTest : Compliance Test Suite for Diagnosing Devices in Real-Time WirelessHART Network. Song Han, Jianping Song, Xiuming Zhu, Al Mok Deji Chen, Mark Nixon Wally Pratt, Veena Gondhalekar. Outline. Introduction and Motivation Wi-HTest Architecture

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wi htest compliance test suite for diagnosing devices in real time wirelesshart network

Wi-HTest: Compliance Test Suite for Diagnosing Devices in Real-Time WirelessHART Network

Song Han, Jianping Song, Xiuming Zhu, Al Mok

Deji Chen, Mark Nixon

Wally Pratt, VeenaGondhalekar

outline
Outline
  • Introduction and Motivation
  • Wi-HTest Architecture
  • Wi-Analys and Post Processing Suite
  • Test Cases
  • Conclusion
introduction
Introduction
  • Overview of WirelessHART Project
  • Motivation for Designing Wi-HTest
  • WirelessHART Test Specification
  • Test Script Format
wirelesshart project overview
WirelessHART Project Overview

2006200720082009

WirelessHART Standard under development

First open wireless communication standard for industrial process control applications

UTCS and Emerson working on the first prototype WirelessHART stack

wirelesshart project overview5
WirelessHART Project Overview

2006200720082009

WirelessHART standards released in September 2007

* Secure and TDMA-based wireless mesh networking technology

* Operating in the 2.4 GHz ISM radio band

* Strict timing requirements, highly reliable and interoperable

wirelesshart project overview6
WirelessHART Project Overview

2006200720082009

Three WirelessHART-related Projects Launched

Wi-HTest Location-aware Application Network Manager

wirelesshart project overview7
WirelessHART Project Overview

2006200720082009

Wi-HTest released and available to member companies

Various WirelessHART devices are under testing

introduction8
Introduction
  • Overview of WirelessHART Project
  • Motivation for Designing Wi-HTest
  • WirelessHART Test Specification
  • Test Script Format
motivation for wi htest
Motivation for Wi-HTest
  • No existing test suite for WirelessHART
  • Assure the standard compliance of WirelessHART devices
  • Need a tool to provide thorough tests for every layer of WirelessHART
  • Help vendors avoid expensive product recalls and technical support costs
introduction10
Introduction
  • Overview of WirelessHART Project
  • Motivation for Designing Wi-HTest
  • WirelessHART Test Specification
  • Test Script Format
test specification and test script
Test Specification and Test Script
  • 5 Phases on 4 Different Layers
    • Boot-Strap Tests
    • Single Correspondent Tests
    • Multiple Correspondent Tests
    • Multi-channel-selection Tests
    • Stress Tests
  • Format of the Test Scripts
    • small, narrowly-focused test applications
    • test configuration + test body
wi htest architecture
Wi-HTest Architecture
  • Overview
  • Wi-HTest Host Architecture
    • RF Interface Driver
    • Network Layer Library and Virtual Device
  • RF Board Design
    • Hardware Platform
    • Real-time Embedded Pseudo Stack
    • The Command Processor
wi htest host architecture14
Wi-HTest Host Architecture

Test Configuration

Configuration MSG

wi htest host architecture15
Wi-HTest Host Architecture

Test Body

Network Packets

wi htest host architecture16
Wi-HTest Host Architecture

Responses from DUT

wi htest host architecture17
Wi-HTest Host Architecture

Support NWK packet manipulation

Support PHY/MAC header manipulation

Support NWK layer performance test

nwk layer library on host
NWK Layer Library on Host
  • Why separate the network layer from the RF?
    • Save resource and guarantee stringent timing requirement on the MAC layer operations.
    • More direct and convenient to inject fault data into the network packet header and payload.
    • Provide the possibility and flexibility to simulate virtual devices and form a simulated network.
  • Functions in the Network Layer Library
virtual device
Virtual Device
  • Goal:
    • Form a simulated network and perform network layer test on DUT.
  • Network Layer Design
    • Separated from MAC layer and installed on Linux Host
    • Independent session and corresponding table structures
    • Complete control over the network layer header/payload
  • MAC Layer Design
    • Allocate necessary superframes and links for communication
    • Faked MAC packets and self-ACK between GW and VDs.
    • Normal MAC communication between VD and DUT.
pseudo stack and command processors
Pseudo Stack and Command Processors
  • Real-time Embedded Pseudo Stack
  • a streaming strategy to encipher a frame and decipher its ACK
  • The interrupt handler is kept as simple as possible
  • Give the MAC layer the highest scheduling priority
  • Three command processors
  • Configuration Cmds: Cmd to configure the RF Interface.
  • Test Cmds: Cmd to be transmitted by the RF to the DUT.
  • Test responses: The responses from the DUT to the Host.
wi analys and post processing
Wi-Analys and Post Processing
  • Complete compliance verification environment needs another two supporting tools
  • Wi-Analys
    • 16 WirelessHART Channel Sniffer
    • Display online messages or redisplay captured log file
    • Built-in intelligence to decipher the messages
    • Built-in filter to display selected messages
  • Post Processing Suite
    • Check the sequence of the messages the DUT transmitted, the transmission time points and the relationship of the messages
snapshot of wi analys
Snapshot of Wi-Analys

Channel Hopping

Deciphered Payload

Built-in Filter

representative test cases
Representative Test Cases
  • Device Join Test (Application Layer)
  • Superframe Management Test (MAC Layer)
  • Source Routing Test (Network Layer)
device join test27
Device Join Test

Join Request with Unique ID

Write Key and Nickname

Write Superframesand Links

superframe management test
Superframe Management Test
  • Test Sequences
  • Increase the number of superframes on DUT until its superframe table is full. After that, add one more superframe.
  • Delete one superframe from the DUT and modify an existing one by providing invalid number of slots.
  • Modify that superframe again with valid number of slots.
  • Add a new superframe with an invalid mode.
  • Delete two superframes from the DUT and then add another two, one with an ASN in the future and one with an ASN in the past.
  • Delete all existing superframes on the DUT.
superframe management test29
Superframe Management Test

Thesuperframe table is full

The DUT reports error status

Try incorrect number of slots

source routing test
Source Routing Test

The virtual device relays the network packets

Self-ACK

Response from the DUT

conclusion
Conclusion
  • Wi-HTest is the first compliance test tool for diagnosing WirelessHART devices.
  • Wi-HTest supports packet manipulation and can conduct compliance tests for every layer.
  • Wi-HTest, Wi-Analys and the post process suite form the complete compliance verification environment.
conclusion32
Conclusion
  • Wi-HTest is the first compliance test tool for diagnosing WirelessHART devices.
  • Wi-HTest supports packet manipulation and can conduct compliance tests for every layer.
  • Wi-HTest, Wi-Analys and the post process suite form the complete compliance verification environment.
slide33

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