We evaluate the performance of a P2P-based content distribution system
in heterogeneous, wireless networks. The mobile users coordinate each
other with cooperation strategies enabled by the multi-source download
mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical
handovers between different wireless access technologies are required
which may result in transmission delays and IP address changes of the
switching peer. Hence, connections among users have to be reestablished
and downloading users are requeued at a providing peer's waiting queue.
In detail, we investigate the impact of requeueing with each VHO as
well as the use of mechanisms that preserve the IP address and
connections beyond VHOs, like MobileIP. Another important phenomenon
occurring with VHOs is the abrupt change of the available bandwidth,
e.g., from a fast WLAN connection to a rather slow UMTS connection. We
evaluate the download times for files by means of simulation while
considering different load scenarios in today's and future network
layouts of the B3G network. As a result of the performance evaluation,
we derive a new time-based cooperation strategy that counters the
impact of mobility. Instead of downloading individual blocks of a file,
a user gets a time slot at a providing peer. We show that this leads to
a significant performance gain.
%0 Report
%1 TR428
%A Duelli, Michael
%A Hoßfeld, Tobias
%A Staehle, Dirk
%C Department of Computer Science
%D 2007
%K myown
%N 428
%T Impact of Vertical Handovers on Cooperative Content Distribution Systems.
%U http://www3.informatik.uni-wuerzburg.de/TR/tr428.pdf
%X We evaluate the performance of a P2P-based content distribution system
in heterogeneous, wireless networks. The mobile users coordinate each
other with cooperation strategies enabled by the multi-source download
mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical
handovers between different wireless access technologies are required
which may result in transmission delays and IP address changes of the
switching peer. Hence, connections among users have to be reestablished
and downloading users are requeued at a providing peer's waiting queue.
In detail, we investigate the impact of requeueing with each VHO as
well as the use of mechanisms that preserve the IP address and
connections beyond VHOs, like MobileIP. Another important phenomenon
occurring with VHOs is the abrupt change of the available bandwidth,
e.g., from a fast WLAN connection to a rather slow UMTS connection. We
evaluate the download times for files by means of simulation while
considering different load scenarios in today's and future network
layouts of the B3G network. As a result of the performance evaluation,
we derive a new time-based cooperation strategy that counters the
impact of mobility. Instead of downloading individual blocks of a file,
a user gets a time slot at a providing peer. We show that this leads to
a significant performance gain.
@techreport{TR428,
abstract = {
We evaluate the performance of a P2P-based content distribution system
in heterogeneous, wireless networks. The mobile users coordinate each
other with cooperation strategies enabled by the multi-source download
mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical
handovers between different wireless access technologies are required
which may result in transmission delays and IP address changes of the
switching peer. Hence, connections among users have to be reestablished
and downloading users are requeued at a providing peer's waiting queue.
In detail, we investigate the impact of requeueing with each VHO as
well as the use of mechanisms that preserve the IP address and
connections beyond VHOs, like MobileIP. Another important phenomenon
occurring with VHOs is the abrupt change of the available bandwidth,
e.g., from a fast WLAN connection to a rather slow UMTS connection. We
evaluate the download times for files by means of simulation while
considering different load scenarios in today's and future network
layouts of the B3G network. As a result of the performance evaluation,
we derive a new time-based cooperation strategy that counters the
impact of mobility. Instead of downloading individual blocks of a file,
a user gets a time slot at a providing peer. We show that this leads to
a significant performance gain.
},
added-at = {2015-06-18T10:00:28.000+0200},
address = {Department of Computer Science},
author = {Duelli, Michael and Hoßfeld, Tobias and Staehle, Dirk},
biburl = {https://www.bibsonomy.org/bibtex/2a12f5344c8a109e1c0a819f835b84110/trcsuniwue},
interhash = {3a606e7fef3c1e95f1d4b4b29001a161},
intrahash = {a12f5344c8a109e1c0a819f835b84110},
keywords = {myown},
month = {June},
number = 428,
timestamp = {2015-06-18T10:00:28.000+0200},
title = {Impact of Vertical Handovers on Cooperative Content Distribution Systems.},
type = {Technical Report},
url = {http://www3.informatik.uni-wuerzburg.de/TR/tr428.pdf},
year = 2007
}