Shivajit Mohapatra, Bogdan Carbunar, Michael Pearce, Rohit Chaudhri, Venu Vasudevan.
"Where-Fi: A Dynamic Energy-Efficient Multimedia Distribution Framework for MANETs",
In Proceedings of the 15th SPIE/ACM Annual Multimedia Computing and Networking Conference (MMCN),
San Jose, January 2008
[26%]
[pdf]
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 ``phased
locked" schedules are then exploited to adaptively transition the
network interface to a deep sleep state for energy savings. We
present two novel applications (called ``Zeitgeist" and ``MeCast")
developed using our protocol that present compelling ``social
experiences" for users. 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.
Bogdan Carbunar, Brett Lindsley, Michael Pearce, Venu Vasudevan.
"Verifiable Credit Based Transfers in Wireless Ad Hoc Networks".
In Proceedings of the 21st IEEE International Parallel and Distributed Processing Symposium (IPDPS),
Long Beach, March 2007
[26%]
[pdf]
Encouraging cooperation between users of mobile devices operating in ad Hon
mode is a difficult task mostly because the scarce battery and bandwidth
resources of devices suggest that selfish behavior may be most beneficial.
The insecure usage of credits to reward cooperation can easily
provide an incentive for cheating, thus, on the long term only leading to
selfishness. In this paper we propose several secure credit based
mechanisms enforcing fairness in a hybrid wireless content retrieval
system operating both in cellular and ad Hoc connectivity modes.
Our solution consists of mechanisms for securely and privately discovering
desired content on neighboring devices, simultaneously exchanging credit
and content shares in a verifiable manner and for generating and expiring
non-forgeable credits.
We present experimental results of a partial prototype of our system
implemented on MPx and E680i cellular phones and HP iPaq hx4700 PDAs, along
with extensive simulation results showing that our solution significantly
reduces the effectiveness of selfish behavior, making it an unattractive
strategy.
Ioannis Ioannidis, Bogdan Carbunar, Cristina Nita-Rotaru.
"High Throughput Routing in Hybrid Cellular and Ad-Hoc Networks".
In Proceedings of the 6th IEEE Symposium on World of Wireless, Mobile and Multimedia (WOWMOM),
Taormina, July 2005
[pdf]
In this paper we present DST, a routing protocol for hybrid
networks that is scalable with the network size and achieves
high throughput by taking advantage of multiple channels.
DST maintains a close to optimal spanning tree of the network
by using distributed topology trees. DST is fully dynamic and
generates only O(log n) messages per update operation.
We show experimentally that DST scales well with the
network size, making it ideal for the metropolitan environment
hybrid networks are expected to operate in.
Bogdan Carbunar, Ioannis Ioannidis, Cristina Nita-Rotaru.
"JANUS: Towards Secure and Malicious Resilient Routing in Hybrid Cellular and Ad Hoc Networks".
In Proceedings of the 3rd Workshop on Wireless Security (Wise), held in conjunction with Mobicom,
Philadelphia, October 2004
[25%]
[pdf]
In this paper we investigate and provide solutions for security threats
in the context of hybrid networks consisting of a cellular base station
and mobile devices equipped with dual cellular and ad-hoc
(802.11b) cards. The cellular connection is used for receiving services
(i.e. Internet access) from the base station, while the ad-hoc
links are used to improve the quality of the connection. We provide
detailed descriptions of several attacks that arbitrarily powerful adversaries,
whether outsiders or insiders, can mount against wellbehaved
members of the network. We introduce a secure routing
protocol called JANUS, that focuses on the establishment of secure
routes between the base station and mobile devices, and the secure
routing of the data. We show that our protocol is secure against the
attacks described and experimentally compare the message overhead
introduced by JANUS and UCAN.
Ioannis Ioannidis, Bogdan Carbunar.
"Scalable Routing in Hybrid Ad Hoc and Cellular Networks" (extended abstract/poster).
Accepted for publication in the 1st IEEE International Conference on Mobile Ad Hoc and Sensor Systems (MASS),
Fort Lauderdale, October 2004
Bogdan Carbunar, Ioannis Ioannidis, Ananth Grama, Jan Vitek.
"A Secure Crediting Protocol for Hybrid Cellular and Ad Hoc Networks".
In Proceedings of the 1st International Conference on E-Business and Telecommunication Networks (ICETE),
Setubal, August 2004
[pdf]
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