Prof' Aura Ganz

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• Prof. Aura Ganz
• Anwar M. Haneef
• Santhosh R. Thampuran
• Multimedia Networks Laboratory
• University of Massachusetts, Amherst

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Agenda

• Motivation
• Usage Scenario
• System Architecture

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Agenda

• Motivation
• Usage Scenario
• System Architecture

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Motivation

• Users getting more mobile
• Transition from desktops to laptops to handhelds
• Need to customize applications to meet the change
  in devices
• Distance Education is one such application which
  needs to keep pace with the time

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Agenda

• Motivation
• Usage Scenario
• System Architecture

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Usage Scenario
Alice _at_ the campus cafe
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Usage Scenario
MOKSHA Client Agent is activated
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Usage Scenario
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Usage Scenario
Connectivity Mode
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Usage Scenario
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Usage Scenario
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Usage Scenario
Course contents are now updated on the client and
are accessible by the user
Stand-alone Mode
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Usage Scenario - II
Alice _at_ the train
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Usage Scenario - II
Alice _at_ the train
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Usage Scenario - II
Bobs MOKSHA Client activated
Alices MOKSHA Client activated
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Usage Scenario - II
Bobs MOKSHA Client searches for peer device
Peering Mode
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Usage Scenario - II
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Usage Scenario - II
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Usage Scenario - II
Course contents are now updated on the client and
are accessible by the user
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Agenda

• Motivation
• Usage Scenario
• System Architecture

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System Architecture

• Network Connectivity modes
• Course Content
• Intelligent Caching

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System Architecture

• Network Connectivity modes
• Course Content
• Intelligent Caching

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Network Connectivity Modes

• Connectivity Mode
• Stand-alone Mode
• Peering Mode

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System Architecture

• Network Connectivity modes
• Course Content
• Intelligent Caching

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Course Content

• Multi-track layout of course content
• Slow Track
• Medium Track
• Fast Track

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Multiple Tracks
High speed track (brief overview)
Intermediate track (Descriptive)
Slow paced track (Exhaustive description)
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System Architecture

• Network Connectivity modes
• Course Content
• Intelligent Caching

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Intelligent Caching

• Intelligent Caching based on
• User navigational pattern
• Device characteristics
• Network Characteristics

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Intelligent Caching

• Intelligent Caching based on
• User navigational pattern
• Device characteristics
• Network Characteristics

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User navigational pattern
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User navigational pattern

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Intelligent Caching

• Intelligent Caching based on
• User navigational pattern
• Device characteristics
• Network Characteristics

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Device characteristics
MOKSHA course server
Memory Capacity Screen Size Resolution Multimedi
a Capability
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Intelligent Caching

• Intelligent Caching based on
• User navigational pattern
• Device characteristics
• Network Characteristics

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Network Characteristics

• Variable Bandwidth
• Users shifting from high speed LANs (IEEE 802.11)
  to low speed WANs (Cellular Network)
• Assume Connectivity mode during LAN connectivity
• Low bandwidth WAN sets MOKSHA to Stand-alone mode

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Network Characteristics
IEEE 802.11b Wireless LAN bridge
Course information retrieved when using the high
bandwidth LAN
Access _at_ LAN
Connectivity Mode
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Network Characteristics
Cellular Network
Cached course information utilized when connected
via the low bandwidth WAN
Access _at_ WAN
Stand-alone Mode
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Thank You !!!

• Multimedia Networks Laboratory
• University of Massachusetts, Amherst
• http//www.ecs.umass.edu/ece/wireless/