Strategies to maximize carried traffic in dual-mode cellular systems

Dual-mode cellular systems based on the EIA/TIA IS-54 standard offer the eventual prospect of carrying up to six digital calls in the same bandwidth as a single analog call. During the transition from analog to digital service, however, the call-carrying capacity of such systems will be limited by t...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2000-03, Vol.49 (2), p.357-366
Main Authors: Morley, G.D., Grover, W.D.
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Base stations
Cellular
Closed-form solution
Digital
Equipments and installations
Exact sciences and technology
Exact solutions
Linear programming
Mathematical analysis
Mobile communication
Mobile radiocommunication systems
Radio frequency
Radiocommunications
Spectra
Standards development
Statistics
Strategy
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teletraffic
Traffic control
Traffic engineering
Traffic flow
Vocoders
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Summary:Dual-mode cellular systems based on the EIA/TIA IS-54 standard offer the eventual prospect of carrying up to six digital calls in the same bandwidth as a single analog call. During the transition from analog to digital service, however, the call-carrying capacity of such systems will be limited by the presence of existing analog users. In this situation, it is reasonable to ask if there are call-handling strategies that could increase the total traffic carried by providing preferential treatment to digital users. We consider four such strategies for maximizing the total traffic carried by a dual-mode cellular system. For two of these strategies, including the baseline "no-control" strategy we develop closed-form solutions for carried traffic and other related service statistics. The closed-form solution for the no-control case is then extended to provide a tight upper bound on carried traffic for any control strategy. We also present a method for finding the optimal control strategy by applying linear programming (LP) techniques. The strategies are compared for various proportions of analog and digital users and offered traffic levels. The findings show that it is actually quite difficult to obtain gains using strategies that exploit the difference in spectral efficiency between analog and digital calls, even with formally optimal strategies. While this is an unexpected finding, we feel the conclusion has been well validated and is now understood and explained in the paper.
ISSN:0018-9545
1939-9359
DOI:10.1109/25.832966