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Adaptive protocols for mobile ad hoc networksHolland, Gavin Douglas 17 February 2005 (has links)
Recent advances in low-power technologies have resulted in the proliferation of
inexpensive handheld mobile computing devices. Soon, just like the Internet empow-
ered a whole new world of applications for personal computers, the development and
deployment of robust ubiquitous wireless networks will enable many new and exciting
futuristic applications. Certain to be an important part of this future is a class of
networks known as "mobile ad hoc networks." Mobile ad hoc networks (or simply
"ad hoc networks") are local-area networks formed "on the spot" between collocated
wireless devices. These devices self-organize by sharing information with their neigh-
bors to establish communication pathways whenever and wherever they are. For ad
hoc networks to succeed, however, new protocols must be developed that are capable
of adapting to their dynamic nature.
In this dissertation, we present a number of adaptive protocols that are designed
for this purpose. We investigate new link layer mechanisms that dynamically monitor
and adapt to changes in link quality, including a protocol that uses common control
messages to form a tight feedback control loop for adaptation of the link data rate
to best match the channel conditions perceived by the receiver. We also investigate
routing protocols that adapt route selection according to network characteristics. In
particular, we present two on-demand routing protocols that are designed to take
advantage of the presence of multirate links. We then investigate the performance of
TCP, showing how communication outages caused by link failures and routing delays
can be very detrimental to its performance. In response, we present a solution to this
problem that uses explicit feedback messages from the link layer about link failures to
adapt TCP's behavior. Finally, we show how link failures in heterogeneous networks
containing links with widely varying bandwidth and delay can cause repeated "modal"
changes in capacity that TCP is slow to detect. We then present a modifed version
of TCP that is capable of more rapidly detecting and adapting to these changes.
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Adapting a delay-based protocol to heterogeneous environmentsKotla, Kiran 10 October 2008 (has links)
We investigate the issues in making a delay-based protocol adaptive to heterogeneous
environments. We assess and address the problems a delay-based protocol
faces when competing with a loss-based protocol such as TCP. We investigate if noise
and variability in delay measurements in environments such as cable and ADSL access
networks impact the delay-based protocol behavior significantly. We investigate these
issues in the context of incremental deployment of a new delay-based protocol, PERT.
We propose design modifications to PERT to compete with the TCP flavor SACK.
We show through simulations and real network experiments that, with the proposed
changes, PERT experiences lower drop rates than SACK and leads to lower overall
drop rates with different mixes of PERT and SACK protocols. Delay-based protocols,
being less aggressive, have problems in fully utilizing a highspeed link while operating
alone. We show that a single PERT flow can fully utilize a high-speed, high-delay link.
We performed several experiments with diverse parameters and simulated numerous
scenarios using ns-2. The results from simulations indicate that PERT can adapt
to heterogeneous networks and can operate well in an environment of heterogeneous
protocols and other miscellaneous scenarios like wireless networks (in the presence of channel errors). We also show that proposed changes retain the desirable properties
of PERT such as low loss rates and fairness when operating alone.
To see how the protocol performs with the real-world traffic, the protocol has
also been implemented in the Linux kernel and tested through experiments on live
networks, by measuring the throughput and losses between nodes in our lab at TAMU
and different machines at diverse location across the globe on the planet-lab.
The results from simulations indicate that PERT can compete with TCP in
diverse environments and provides benefits as it is incrementally deployed. Results
from real-network experiments strengthen this claim as PERT shows similar behavior
with the real-world traffic.
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TCP-Carson a loss-event based adaptive AIMD algorithm for long-lived flows.Kannan, Hariharan. January 2002 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Loss; TFRC; AIMD; TCP. Includes bibliographical references (p. 147-155).
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Location Based Task-To-Do ManagerOpuogen, Philip Jolomi January 2014 (has links)
Ever had an experience of forgetting to do something very important on a place you just past?. Remembering, on arrival at your destination afterward, requires an action to return to the task location. This can be unproductive and perhaps result to frustration. The purpose of this thesis is to develop a “Location Task-To-Do manager” an android mobile application that will efficiently organizes task-to-do list and remind an individual to perform a task at a pre-defined location through notification and alert messages. The methods used includes, investigation of pre-existing systems, requirement elicitation survey technique, three-tier architecture design pattern, iterative development life-cycle model, acceptance test plan and a sets of other technology such as Java SDK, Android APIs, TCP/IP protocol, object oriented programing techniques and MySql relational database. The result showed that, installed “Location Task-To-Do manager” application on individual mobile devices/smartphones were capable of creating task, adding task, editing task, deleting task, sharing task and setting task location through its user friendly graphical interfaces. Users are able to receive notification to perform a task within a minimum distance of 1km to the exact task location.
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A quantitative study of musical instrument digital interface (MIDI) over Internet Protocol (IP) protocolsWilliams, James Pate, January 2005 (has links) (PDF)
Thesis (Ph.D.)--Auburn University, 2005. / Abstract. Vita. Includes bibliographic references (ℓ. 98-99)
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Enhanced mechanisms for explicit congestion notification in TCP/IP networks /Akujobi, Frank January 1900 (has links)
Thesis (M.App.Sc.) - Carleton University, 2003. / Includes bibliographical references (p. 90-92). Also available in electronic format on the Internet.
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3D-Netzwerk-VisualisierungZiegler, Stefan. January 2005 (has links)
Chemnitz, Techn. Univ., Diplomarb., 2005.
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Referenzarchitektur für webbasierten Zugriff auf Produktionssysteme : ein Beitrag zur Integration der heterogenen Kommunikationsstandards der Produktionstechnik /Faller, Clemens. January 2007 (has links)
Universiẗat, Diss., 2006--Bochum.
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Network tomography based on flow level measurementsArifler, Dogu. Evans, Brian L. De Veciana, Gustavo A., January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisors: Brian L. Evans and Gustavo de Veciana. Vita. Includes bibliographical references.
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Adaptionsalgorithmen zur Erhöhung der Dienstgüte verteilter interaktiver Multimedia-Anwendungen in IP-basierten Netzen = Adaptation algorithms for quality of service improvement of distributed interactive multimedia applications in IP-based networks /Schmidt, Thomas Rudolf. January 2004 (has links)
Zugl.: Stuttgart, Universiẗat, Diss., 2004.
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