Context & Group Addressing

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Presentation transcript:

Context & Group Addressing Jason Tam Scott Xu David Shen http://summer.winlab.rutgers.edu/projects/wiki/2012/Projects/MobilityFirst/Context

Group by sensor data context Purpose Explore applications of group addressing and context aware messaging in the MobilityFirst framework New branch of applications opened up Group by sensor data context

Architecture

Data Server - PHP Query Construction 1_KR3DM 3-axis Accelerometer.csv Delimited by an underscore to determine table to insert into `timestamp`,`x`,`y`,`z` Comma delimited field names for insertion field 1345066313885,-0.77469909,-0.3807226,9.442732 Insertion values [id, GUID, and ip added] Final query to run INSERT INTO `1`(`timestamp`, `x`, `y`, `z`, `id`, `guid`, `ip`) VALUES (1345066313885, -0.77469909, -0.3807226, 9.442732, A000002241E787, 30B57BFBB820273207483858911A00377BD558A3, 174.226.197.69)

Data Server - MYSQL Contents

Robust Upload Division of file into chunks Grab last successfully uploaded timestamp Timeout & increase wait time

Data Server - Scalability Replication (simple) Default LAMP install Include our php scripts Initialize

Archival Resolution Queries data server to determine membership App determined (may or may not result in an addition/removal from GCRS)

Immediate Resolution Uses immediate data pull to determine membership Client reads app’s def file Client adds/removes itself

Abstraction for Apps Combine base contexts Create new (app specific) context GCRS assigns group GUID Apps needs only to communicate with group GUID for messaging U4BZ7EFBXF6W173817483778HE1R05327BD55923

Prevailing App Idea ‘iClicker’ Address truthful attendance issue Novel context reliant features

Smartphone (Indoor) Localization [mini digression]

Smartphone (Indoor) Localization GPS Unreliable indoors Wifi trilateration/SVM Requires multiple WLAN Bluetooth Self sufficient for dense networks For all phones Set discoverable Discover Send results (MAC & RSSI) to server to compute

Algorithm Test with Generated Grid Localization Algorithm Grid truths [Modified Algorithm via Robust Distributed Network Localization with Noisy Range Measurements, David Moore, John Leonard, Daniela Rus, Seth Teller MIT Computer Science and Artificial Intelligence Laboratory; 2004]

RSSI -> Distance 𝑃 𝑟 = 𝑃 𝑡 +20 log λ 4𝜋 +10𝑛𝑙𝑜𝑔 1 𝑑 [Formula via Indoor Location Using Trilateration Characteristics, B Cook, G Buckberry, I Scowcroft, J Mitchell, T Allen, 2005 ] 𝑃 𝑟 = 𝑃 𝑡 +20 log λ 4𝜋 +10𝑛𝑙𝑜𝑔 1 𝑑

Anchor Points One globally positioned -> all globally positioned Wifi localization can resolve ambiguities

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