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A UBIQUITOUS PUBLISH/SUBSCRIBE PLATFORM FOR WIRELESS SENSOR NETWORKS WITH MOBILE MULES

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A UBIQUITOUS PUBLISH/SUBSCRIBE PLATFORM FOR WIRELESS SENSOR NETWORKS WITH MOBILE MULES Xiaoyu Tong and Edith C.-H. Ngai Dept. of Information Technology, Uppsala ... – PowerPoint PPT presentation

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Title: A UBIQUITOUS PUBLISH/SUBSCRIBE PLATFORM FOR WIRELESS SENSOR NETWORKS WITH MOBILE MULES


1
A UBIQUITOUS PUBLISH/SUBSCRIBE PLATFORM FOR
WIRELESS SENSOR NETWORKS WITH MOBILE MULES
Xiaoyu Tong and Edith C.-H. Ngai Dept. of Information Technology, Uppsala University, Sweden
2

Problems of Ubiquitous Sensing
  • Stationary sensors are more likely to be sparsely
    deployed in most scenarios.
  • But it is cost prohibitive to connect each of
    them to the Internet at every site.
  • As a result, their deployments and usages are
    heavily limited.

Sparsely Deployed Temperature Sensors in a Forest
3

Problems of Ubiquitous Sensing
  • On the other hand, applications of mobile sensors
    become incredibly popular.
  • But they are constrained by sensor types and
    abilities.
  • Our goal
  • Easier and more flexible deployments of
    stationary sensors.
  • Enable ubiquitous sensing services from both
    stationary sensors and mobile sensors.

4

System Model
  • Publish/subscribe paradigm is employed to support
    asynchronous communications.
  • Smart phones are utilized as both mobile sensors
    and data mules.
  • Built-in sensors GPS, Camera, etc.
  • Short range communication with wireless sensors,
    IEEE802.15.4, Bluetooth, or ANT.
  • Encounter and communicate with wireless sensors
    opportunistically.
  • Stationary sensors are sparsely deployed.

5

Key Challenges
  • Deployments of both stationary sensors and mobile
    sensors are dynamic.
  • Communication overhead will draw power quickly
    from both mobile phones and stationary sensors.
  • Mobile users who carry the smart phones have
    individual and uncontrollable mobility.

6

Related Work
  • MQTT-S has been proposed to enable topic-based
    publish/subscribe in WSNs.
  • Huang et al. described how to distribute the
    system across multiple computers or mobile
    devices to distribute load and cope with
    failures, message loss and disconnections.
  • The above works focus on adoption of
    publish/subscribe in WSNs and publish/subscribe
    system with mobile environments, while the
    sensing context, heterogeneity of sensing
    devices, mobility of nodes and limited
    connectivity of wireless sensors remain to be
    further explored.

7

Network Model
  • Stationary Sensor SSensor.
  • Mobile Sensor MSensor.
  • Platform Server Broker.
  • Mobile Phone Mobile Broker.
  • Sparse Sensor Networks SSNs.

8

Publish/Subscribe Platform Design
  • Area-based Subscriptions

9

Publish/Subscribe Platform Design
  • Adaptive Location Updates
  • How often should a MB update its locations?
  • Default periodically with constant time interval
  • Reduce unnecessary location updates

10

Publish/Subscribe Platform Design
  • Full Installation
  • Best-effort Subscription Delivery
  • Number of MSensors in a target area is higher
    dynamic.
  • Installations of subscriptions to SSensors are
    opportunistic.
  • Keep deployments of sensors transparent to
    platform.

11

Publish/Subscribe Platform Design
  • Event Data Collection
  • ECF flag avoiding unnecessary collection.
  • Push-based event collection for MSensors.
  • Pull-based event collection for Ssensors.

12

Implementation
  • Broker
  • Restful Http Server.
  • Mobile Broker
  • Android Usb cable IEEE 802.15.4.
  • ANT or Bluetooth 4 in the future
  • Stationary Sensor
  • Contiki Rime Coffee IEEE802.15.4.

13

Experimentation
  • Scenario and Settings

14

Experimentation
  • Installation of Stationary Sensors along Hiking
    Trail.

15

Experimentation
  • Sensing Data from Stationary Sensors

16

Experimentation
  • Sensing Data from Mobile Sensors

17

Experimentation
  • Sensing Data from Mobile Sensors

18

Experimentation
  • Data Delivery Delay

19

Experimentation
  • Number of Received Data

20

Experimentation
  • Communication Overhead

21

Summary
  • We proposed and implemented a novel
    publish/subscribe platform for ubiquitous data
    access from both wireless sensors and mobile
    phones without relying on any network
    infrastructure.
  • Mobile phones are utilized as mobile mules to
    relay subscriptions and published data between
    the Internet users and the remote sensors.
  • We implemented our platform on real hardwares and
    experimented it in a hiking trail application.
  • In the future, we plan to study the coordination
    among heterogeneous mobile and sensing devices to
    further reduce the energy consumption and
    communication overhead.
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