Transfer-Sp10-1 - TRANSFER: Transactions Routing for Ad-hoc...

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Ahmed Helmy - UFL 1 TRANSFER : Transactions Routing for Ad-hoc NetworkS with eFficient EneRgy Ahmed Helmy Computer and Information Science and Engineering (CISE) University of Florida (UFL) email: helmy@ufl.edu web: www.cise.ufl.edu/~helmy Wireless Networking Lab: nile.cise.ufl.edu
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Ahmed Helmy - UFL 2 Motivation Most current ad hoc routing approaches Setup/maintain optimal (e.g., shortest) routes (DSR, AODV, ZRP,. .) Incur high route discovery cost, warranted for long- lived flows where cost is amortized over flow duration In Small Transactions Cost is dominated by route discovery (vs. data transfer) Design Goal: reduce cost for small transactions Example small transactions: resource discovery query, text messaging, sensor network query, etc.
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Ahmed Helmy - UFL 3 Approach Avoid flooding-based approaches and instead of flat architecture use hierarchical architecture Instead of complex hierarchy formation use loose hierarchy (zone-based) Instead of bordercasting (as in ZRP) query only a few selected contact nodes Contacts act as short cuts to bridge zones and reduce degrees of separation between querier & resource Borrows from the concept of small worlds
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Ahmed Helmy - UFL 4 sensor sensor sensor sensor sensor sensor sensor sensor Pocket PC PDA Mobile phone Handheld Computing capability GPS & location capability GPS & location capability Computing capability Source ( S ) Target Zone of S Contact ( C1 ) Contact ( C2 ) Zone of C1 Zone of C2 sensor sensor sensor sensor sensor sensor sensor Pocket PC PDA Mobile phone Handheld Computing capability GPS& location capability GPS & location capability Computing capability Source ( S ) Target (a) Flooding from source ( S ) to discover Target (b) Query from source ( S ) using contacts C1 and C2 to discover Target Flooding vs. Contact-based Query
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Ahmed Helmy - UFL 5 R R R R Q contact contact contact Q : Querier Node B : Border Node C : Contact Node R : Proximity radius r : Contact distance r C2 C1 C3 B1 B2 B3 C2 ’s proximity Q ’s proximity Architectural Overview NoC : Number of Contacts
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Ahmed Helmy - UFL 6 Contact Selection Scheme Reactive (on-demand) contact selection
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Transfer-Sp10-1 - TRANSFER: Transactions Routing for Ad-hoc...

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