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UBC Theses and Dissertations
Channel usage statistics and cellular digital packet data : channel selection strategies in cellular telephony systems Jedrzycki, Christopher Mark
Abstract
In order to prevent high rates of blocking, channel utilization in analog cellular mobile radio networks is significantly lower than 100%. The idle channels can be used to extend various information services to mobile users by overlaying a secondary packet-switched data service over the conventional circuit-switched voice service. This task is currently performed by the Cellular Digital Packet Data (CDPD) service. The throughput and utilization of the CDPD service depends to a large extent on the Advanced Mobile Phone System (AMPS) traffic statistics. These statistics have only been approximated and have never been verified with real data in current open literature. This thesis presents traffic data obtained from BC Tel Mobility, a cellular service provider, and describes the AMPS channel holding time and call inter arrival time distributions. The channel holding time is not best approximated by the negative exponential distribution as usually stated in literature. The lognormal distribution proves to be a much closer fit. Several spikes have to be added to this distribution to account for immediate handoff candidacy. The AMPS traffic statistics are then used to study the channel holding time of the CDPD service. The channel assignment strategy used for assigning channels to new calls in the AMPS and CDPD services is studied and a recommendation as to which is the optimal combination is made. The optimal channel assignment strategy results in the CDPD service being interrupted only when the new AMPS call finds no other idle channels in the cell site than the CDPD channel. The study considers factors which affect the CDPD channel holding times such as AMPS traffic levels, number of channels in the cell site and number of CDPD streams at the cell site. The study concludes with the effect of all these factors on the utilization of the CDPD service.
Item Metadata
Title |
Channel usage statistics and cellular digital packet data : channel selection strategies in cellular telephony systems
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
In order to prevent high rates of blocking, channel utilization in analog cellular mobile radio
networks is significantly lower than 100%. The idle channels can be used to extend various
information services to mobile users by overlaying a secondary packet-switched data service over
the conventional circuit-switched voice service. This task is currently performed by the Cellular
Digital Packet Data (CDPD) service.
The throughput and utilization of the CDPD service depends to a large extent on the
Advanced Mobile Phone System (AMPS) traffic statistics. These statistics have only been
approximated and have never been verified with real data in current open literature. This thesis
presents traffic data obtained from BC Tel Mobility, a cellular service provider, and describes the
AMPS channel holding time and call inter arrival time distributions. The channel holding time is
not best approximated by the negative exponential distribution as usually stated in literature. The
lognormal distribution proves to be a much closer fit. Several spikes have to be added to this
distribution to account for immediate handoff candidacy.
The AMPS traffic statistics are then used to study the channel holding time of the CDPD
service. The channel assignment strategy used for assigning channels to new calls in the AMPS
and CDPD services is studied and a recommendation as to which is the optimal combination is
made. The optimal channel assignment strategy results in the CDPD service being interrupted
only when the new AMPS call finds no other idle channels in the cell site than the CDPD
channel. The study considers factors which affect the CDPD channel holding times such as
AMPS traffic levels, number of channels in the cell site and number of CDPD streams at the cell
site. The study concludes with the effect of all these factors on the utilization of the CDPD
service.
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Extent |
4870583 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-25
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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 |
10.14288/1.0065198
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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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.