CS 441: Charles Durran Kelly

foamyflumpMobile - Wireless

Nov 21, 2013 (3 years and 6 months ago)

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CS 441: Charles Durran Kelly


What are Wireless Sensor Networks?


WSN Challenges


What is a Smartphone Sensor Network?


Why use such a network?


Applications


Current Challenges


Summary


A

wireless sensor network (WSN)

consists of
spatially distributed

autonomous

sensors

to




monitor


physical or environmental
conditions, such as

temperature
,

sound
,




vibration
,

pressure
, motion or pollutants and
to cooperatively pass their data through the
network to a main location.


Power consumption constrains for nodes
using batteries


Ability to cope with node failures


Mobility of nodes


Dynamic network topology


Communication failures


Scalability to large scale of deployment


Ability to withstand harsh environmental
conditions


Unattended operation



Challenge 1: Monitoring Mobile Human
Subjects Requires a Large Quantity of



Sensors



Challenge 2: Sensor Distribution and
Maintenance is Time
-
consuming and Costly


Challenge 3: Limited Sensor Node Computing
Capabilities Require Complex Low
-
level
Software Optimization



Challenge 4: Sensor Network Data
Communication Requires Complex
Communication Protocols


Use of
Smartphones

for WSN


Sensor capabilities


Widespread usage


Less energy constraints


Connection to Cellular Networks/Internet


Web service APIs


End Users provide maintenance




Addressing Challenge 1 by Using End
-
user
Smartphones

to Monitor Mobile Human
Populations



Addressing Challenge 2 by Relying on
Smartphone Owners for Sensor Hardware
Maintenance


Addressing Challenge 3 by Leveraging
Powerful Smartphone Processors and High
-
level Programming APIs to Simplify Sensor
Software Development



Further by Utilizing Web Services to
Supplement Smartphone Visualization and
Processing Capabilities




Addressing Challenge 4 by Relying on
Multiple Networking Connections to Avoid
Networking Complications




Mobile Payments


Building Access


Advanced
-
location Based Services


Ticketing



Issue 1: Use of Web Services Restricts
Flexibility



Issue 2: Protecting Network Security, Privacy,
and Data Integrity





Issue 3:
Smartphones

Have Responsibilities
Other Than Powering the Sensor Network






Sensor capabilities


Widespread usage


Less energy constraints


Connection to Cellular Networks/Internet


End Users provide maintenance


Application possibilities