HINT: from Network Characterization to Opportunistic Applications

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HINT: from Network Characterization

to Opportunistic Applications

ACM CHANTS 2016, New-York

Gwilherm Baudic, Antoine Auger,   Victor Ramiro, Emmanuel Lochin

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Introduction

✓ More and more connected devices

✓ Opportunistic networks are a promising

alternative to infrastructure-based networks

➡

_{Opportunistic applications}

_{= user applications}

running over opportunistic networks

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OppChat

: a simple

messaging application

Opportunistic applications behavior

is highly affected by network

p e r f o r m a n c e s ( Q o E , Q o S ,

application footprint)

Developers want a convenient tool

to see if their application works!

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OppChat

: a simple

messaging application

Opportunistic applications behavior

is highly affected by network

p e r f o r m a n c e s ( Q o E , Q o S ,

application footprint)

Developers want a convenient tool

to see if their application works!

➡ There is a gap between network

characterization and application

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Opportunistic network

characterization

Developers of opportunistic applications should have

some knowledge about network characterization

➡ Impor tant to understand and improve

application behaviour

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Opportunistic network

characterization

Developers of opportunistic applications should have

some knowledge about network characterization

➡ Impor tant to understand and improve

application behaviour

Analytical   modeling Simulators Traces collection Emulators and testbeds

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H

int

I

s

N

ot a

T

estbed

We propose the HINT emulator to bridge the gap between network characterization and application development

Main requirements: Real-time, Contact-oriented emulation, Tuning, Monitoring, Application transparency, Repeatability, Availability

Emulated   opportunistic network

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The HINT emulator

HINT relies on the definition of user scenarios

➡ A scenario is programmatically defined writing a

Python script that implements the class

Scenario

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The HINT emulator

HINT relies on the definition of user scenarios

➡ A scenario is programmatically defined writing a

Python script that implements the class

Scenario

A user

Scenario

should at least define:

•

List of real and virtual nodes

•

List of node pairs

•

Pairwise Contact frequency (Analytical models or

Traces)

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The HINT emulator

Core Emulator Message Broker Monitoring & Tuning Database Real world HINT emulator App ULL App ULL App ULL

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HINT evaluation:

Application development

Message metadata: w e s e e h o w t h e message traverses several opportunistic nodes

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HINT evaluation:

Application development

1. Include the User Link

Layer (ULL) package

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HINT evaluation:

Application development

1. Include the User Link

Layer (ULL) package

2. Start the

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HINT evaluation:

Application development

1. Include the User Link

Layer (ULL) package

2. Start the

UserLinkLayerService

3. Use APIs to send /

receive opportunistic

messages

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Monitoring and tuning:

✓ Network view

✓ Pair view

✓ Node view

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Monitoring and tuning:

✓ Network view

✓ Pair view

✓ Node view

A demo of HINT is scheduled later at

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HINT evaluation:

Core scalability

Trace Average Maximum

Rollernet 26 146

MIT 180 days 0.008 34

Infocom 2005 0.22 26

Average and maximum number of events per second for real traces

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The Core Emulator of HINT can schedule   around 300 events/s with no more than 1s

threshold delay Currently using Python basic scheduler (proof of concept) 300 0.00 0.25 0.50 0.75 1.00 10 1000 Missed e vents r atio T=1 T=0.1 T=0.01

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Conclusions

✓ _{HINT is a lightweight hybrid emulation system to}

help developers of opportunistic applications

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Conclusions

✓ _{Application transparency, network monitoring/tuning}

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Conclusions

➡ Future work: extended evaluation

➡ New routing protocols, buffer management policies, core scheduler implementation (APS)

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Conclusions

➡ Future work: extended evaluation

➡ New routing protocols, buffer management policies, core scheduler implementation (APS)

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Antoine Auger 

[email protected]

Thank you for your attention

This research was supported in part by the French Ministry of Defense

HINT: from Network Characterization to Opportunistic Applications