Die
Forschung des Lehrstuhls beschäftigt sich schwerpunktmäßig
mit mobilen bzw drahtlosen Kommunikationssystemen der Vierten Generation.
Unsere Expertise ist die Leistungsanalyse durch mathematische Methoden
und Stochastische Simulation.
Ph. D. Dissertation Aachen University, ABMT 46, p. 237, ISBN:3-86130-175-X,Wissenschaftsverlag Mainz, 2005.
Publication Date: Feb, 2005
On page(s):237
ISBN: 3-86130-175-X
Abstract
New multimedia services accessible via the Internet are strongly
driving the demand for residential and commercial broadband wireless
networks. IEEE 802.11, a Wireless LAN (WLAN) system, has gained
immense popularity since years back. Wi-Fi, a sort of WLAN systems,
is mostly used in the hot spots such as universities, exhibition
centers, airports etc. However, the coverage area of the Wi-Fi is
limited to a couple of hundred meters in open-space areas but to a
round one hundred meters in indoor environment.
In this thesis, the author proposes multi-hop concepts for WLANs
system such as IEEE 802.11e and HIPERLAN/2. Multi-hop technology
enlarges the coverage area of a Base Station (BS) or an Access Point
(AP). It also enables the communicating stations to minimize the
battery consumption. Under multi-hop operation, the data packet from the
BS or AP is transmitted to a forwarding station. The forwarding
station will then forward the packet to another forwarding station or
to the destination.
The suggested multi-hop concepts rely on the
centralized operation. Under this operation, a base station or an access
point is responsible for the resource allocation. The AP assigns the
resource by polling the forwarding station that is positioned on the
perimeter of the radio coverage of the AP so that it can activate the
sub-cell it hosts and forward the packet it receives from the AP to
the destination. The centralized operation refrains forwarding
stations from accessing the medium in distributed manner. So
collisions can be prevented or even avoided.
One of the objectives of this thesis is to present the multi-hop
concepts for the IEEE 802.11 and HIPERLAN/2 systems as well as the
interworking concept for both systems. The multi-hop
concepts are easy to be implemented and standard compliant. The
multi-hop concepts are evaluated through mathematical analysis and
simulations. The author also presents the development of a
multi-hop prototype which is used to evaluate the performance
and the correctness of one of the multi-hop concepts. This thesis also
presents a mathematical approach to model the interference situation
in the multi-hop cellular network. Using the interference model, one
can evaluate the effectiveness of multi-hop operation compared to that
of the single-hop operation.
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Die
Forschung des Lehrstuhls beschäftigt sich schwerpunktmäßig
mit mobilen bzw drahtlosen Kommunikationssystemen der Vierten Generation.
Unsere Expertise ist die Leistungsanalyse durch mathematische Methoden
und Stochastische Simulation.
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