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Proceedings Paper

Where-Fi: a dynamic energy-efficient multimedia distribution framework for MANETs
Author(s): Shivajit Mohapatra; Bogdan Carbunar; Michael Pearce; Rohit Chaudhri; Venu Vasudevan
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Paper Abstract

Next generation mobile ad-hoc applications will revolve around users' need for sharing content/presence information with co-located devices. However, keeping such information fresh requires frequent meta-data exchanges, which could result in significant energy overheads. To address this issue, we propose distributed algorithms for energy efficient dissemination of presence and content usage information between nodes in mobile ad-hoc networks. First, we introduce a content dissemination protocol (called CPMP) for effectively distributing frequent small meta-data updates between co-located devices using multicast. We then develop two distributed algorithms that use the CPMP protocol to achieve "phase locked" wake up cycles for all the participating nodes in the network. The first algorithm is designed for fully-connected networks and then extended in the second to handle hidden terminals. The "phase locked" schedules are then exploited to adaptively transition the network interface to a deep sleep state for energy savings. We have implemented a prototype system (called "Where-Fi") on several Motorola Linux-based cell phone models. Our experimental results show that for all network topologies our algorithms were able to achieve "phase locking" between nodes even in the presence of hidden terminals. Moreover, we achieved battery lifetime extensions of as much as 28% for fully connected networks and about 20% for partially connected networks.

Paper Details

Date Published: 28 January 2008
PDF: 12 pages
Proc. SPIE 6818, Multimedia Computing and Networking 2008, 68180K (28 January 2008); doi: 10.1117/12.775134
Show Author Affiliations
Shivajit Mohapatra, Motorola Labs. (United States)
Bogdan Carbunar, Motorola Labs. (United States)
Michael Pearce, Motorola Labs. (United States)
Rohit Chaudhri, Motorola Labs. (United States)
Venu Vasudevan, Motorola Labs. (United States)

Published in SPIE Proceedings Vol. 6818:
Multimedia Computing and Networking 2008
Reza Rejaie; Roger Zimmermann, Editor(s)

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