Strategies to maximize carried traffic in dual-mode cellular systems

Dual-mode cellular systems based on the EIA/TIA IS-54 standard offer the ev entual prospect of carrying up to six digital calls in the same bandwidth a s a single analog call [1], During the transition from analog to digital se rvice, however, the call-carrying capacity of such systems will be limited by the presence of existing analog users. In this situation, it is reasonab le to ask if there are call-handling strategies that could increase the tot al 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 bas eline "no-control" strategy, we develop closed-form solutions for carried t raffic and other related service statistics. The closed-form solution for t he no-control case is then extended to provide a tight upper bound on carri ed traffic for any control strategy. We also present a method for finding t he 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 qui te difficult to obtain gains using strategies that exploit the difference i n spectral efficiency between analog and digital calls, even with formally optimal strategies. While this is an unexpected finding, we feel the conclu sion has been well validated and is now understood and explained in the pap er.