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UBC Theses and Dissertations
Performance analysis of destination multiplexing for wireless LANs Zhuang, Youli
Abstract
This thesis describes the performance of the IEEE 802.11 Medium Access Control (MAC) protocol with and without destination multiplexing. The IEEE 802.11 MAC protocol, the most widely used standard for Wireless Local Area Networks (WLANs), allows the wireless channel to be effectively shared by portable computers or wireless stations. In this thesis we consider the most common WLAN structure, one where wireless stations connect to a "backbone" wired LAN through a fixed base station or access point (AP). We consider the traffic from APs to wireless stations since typically most of the data flows in this direction. We also take into account fading since it is unavoidable in real wireless channels. An AP using First In First Out (FIFO) packet scheduling transmits or retransmits a data frame until it is successfully received. Fading that lasts for several retransmissions will degrade the performance of the system. Destination multiplexing selects a different destination after a failed transmission. Because of the statistical independence of the fading between the AP and different wireless stations, a transmission to another destination is more likely to be successful. We performed a computer simulation study of throughput and average delay for the overall system. The following factors were studied in our simulations: different data rates, different number of nodes, collision effect, different data frame length, effect of RTS/CTS control frames, different algorithms in selection of next frame, and the effect of fading channel parameters. Our results show that under some conditions destination multiplexing can improve the throughput more than 20 to 30 percent and decrease the average delay significantly.
Item Metadata
Title |
Performance analysis of destination multiplexing for wireless LANs
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2003
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Description |
This thesis describes the performance of the IEEE 802.11 Medium Access Control (MAC)
protocol with and without destination multiplexing. The IEEE 802.11 MAC protocol, the most
widely used standard for Wireless Local Area Networks (WLANs), allows the wireless channel to
be effectively shared by portable computers or wireless stations.
In this thesis we consider the most common WLAN structure, one where wireless stations
connect to a "backbone" wired LAN through a fixed base station or access point (AP). We
consider the traffic from APs to wireless stations since typically most of the data flows in this
direction. We also take into account fading since it is unavoidable in real wireless channels.
An AP using First In First Out (FIFO) packet scheduling transmits or retransmits a data
frame until it is successfully received. Fading that lasts for several retransmissions will degrade
the performance of the system. Destination multiplexing selects a different destination after a
failed transmission. Because of the statistical independence of the fading between the AP and
different wireless stations, a transmission to another destination is more likely to be successful.
We performed a computer simulation study of throughput and average delay for the
overall system. The following factors were studied in our simulations: different data rates, different
number of nodes, collision effect, different data frame length, effect of RTS/CTS control
frames, different algorithms in selection of next frame, and the effect of fading channel parameters.
Our results show that under some conditions destination multiplexing can improve the
throughput more than 20 to 30 percent and decrease the average delay significantly.
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Extent |
2862514 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-11-17
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0091330
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2003-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.