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Mesh Distributed Coordination Function for Efficient Wireless Mesh Networks Supporting QoS
Zhao, Rui
Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University Kontakt: publications@comnets.rwth-aachen.de
Ph. D. Dissertation RWTH Aachen University, ABMT 54, p. 181, ISBN:3-86130-933-5,Wissenschaftsverlag Mainz, 2007.
Publication Date: Apr, 2007
On page(s):181
ISBN: 3-86130-933-5
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Wireless Mesh Networks (WMN) are receiving growing attention. They can widely find
applications in Wireless Local Area Networks (WLAN), Wireless Metropolitan Area
Networks (WMAN), Wireless Personal Area Networks (WPAN) and Wireless Sensor
Networks (WSN), helping to substantially improve the network performance, cut down
the operation cost and bring more convenience to both operators and end users. There
are lots of open research issues in the field. Among them, the design of the Media Access
Control (MAC) protocol is the most challenging one.
This thesis proposes Mesh Distributed Coordination Function (MDCF), a novel MAC
protocol that can be used to construct efficient WMNs supporting Quality of Service
(QoS). MDCF applies Time Division Multiple Access (TDMA) to share the radio medium
in a fully distributed manner. It is able to run on a single frequency channel independent
of physical schemes. Transmissions in MDCF networks take place in periodic
time slots in a dynamic Time Division Duplex (TDD) mode of operation. A novel
synchronization algorithm, operating under fully distributed control, is proposed for
synchronizing mesh points (MP) for TDMA operation in the multi-hop environment.
MDCF is well designed to properly handle highly loaded situations, hidden stations,
exposed stations and capture effect which usually appear in a mesh environment and
may dramatically deteriorate the network performance. For QoS support, besides a
prioritized, collision eliminating and fair channel access mechanism, a distributed Radio
Resource Control (RRC) protocol is used to evaluate and allocate a fair portion of
bandwidth to a specific traffic flow. The assigned portion of the bandwidth for a flow is
adaptable with the traffic load and overall channel utilization. As a result, MDCF is able
to efficiently exploit channel capacity, fairly distribute bandwidth and support multi-hop
relaying of a large number of concurrent various traffic services in a WMN.
The performance of MDCF is extensively evaluated by both analytical and simulation
approaches. The results exhibit the outstanding performance of MDCF, significantly
outperforming the IEEE 802.11 Distributed Coordination Function (DCF) and Enhanced
Distributed Coordinated Access (EDCA), in both single-hop and mesh environments.
MDCF has been submitted as a MAC proposal for the IEEE 802.11 Task Group s (TGs),
which is formed to develop mesh WLANs. It can also be tailored for WMAN, WPAN
and WSN mesh applications.
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@PHDTHESIS{DISS_Zhao_2007,
AUTHOR = {Zhao, R.},
TITLE = {Mesh Distributed Coordination Function for Efficient Wireless Mesh
Networks Supporting QoS},
YEAR = {2007},
MONTH = {Apr},
VOLUME = {54},
PAGES = {181},
PUBLISHER = {Wissenschaftsverlag Mainz},
ADDRESS = {Lehrstuhl für Kommunikationsnetze, Aachen, Germany},
SCHOOL = {RWTH Aachen University},
SERIES = {ABMT},
EDITION = {1},
AFFILIATION = {Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University},
ISBN = {3-86130-933-5},
URL = {http://www.comnets.rwth-aachen.de}
}
Signature in CN-Library = {Qa 054}
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| | Letzte Änderung: 17.09.2008 11.46 | |
