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  • 1
    Electronic Resource
    Electronic Resource
    Distributed Discrete Power Control in Cellular PCS (1998)
    Springer
    Wireless personal communications 6 (1998), S. 211-231 
    Details
    ISSN: 1572-834X
    Keywords: PCS ; wireless ; constrained power control ; discrete power levels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Transmitter power control has proven to be an efficient method to control cochannel interference in cellular PCS, and to increase bandwidth utilization. Power control can also improve channel quality, lower the power consumption, and facilitate network management functions such as mobile removals, hand-off and admission control. Most of the previous studies have assumed that the transmitter power level is controlled in a continuous domain, whereas in digitally power controlled systems, power levels are discrete. In this paper we study the transmitter power control problem using only a finite set of discrete power levels. The optimal discrete power vector is characterized, and a Distributed Discrete Power Control (DDPC) algorithm which converges to it, is presented. The impact of the power level grid on the outage probability is also investigated. A microcellular case study is used to evaluate the outage probabilities of the algorithms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008888824271
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  • 2
    Electronic Resource
    Electronic Resource
    Expected waiting times in polling systems under priority disciplines (1991)
    Springer
    Queueing systems 9 (1991), S. 419-439 
    Details
    ISSN: 1572-9443
    Keywords: Polling systems ; loop systems ; single-server-queue ; priorites ; pseudo conservation law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we analyse a service system which consists of several queues (stations) polled by a single server in a cyclic order with arbitrary switchover times. Customers from several priority classes arrive into each of the queues according to independent Poisson processes and require arbitrarily distributed service times. We consider the system under various priority service disciplines: head-of-the-line priority limited to one and semi-exhaustive, head-of-the-line priority limited to one with background customers, and global priority limited to one. For the first two disciplines we derive a pseudo conservation law. For the third discipline, we show how to obtain the expected waiting time of a customer from any given priority class. For the last discipline we find the expected waiting time of a customer from the highest priority class. The principal tool for our analysis is the stochastic decomposition law for a single server system with vacations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159225
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    Paper (German National Licenses)
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