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|Title: ||Analysis of an asymmetric polling system|
|Authors: ||KHALID, M|
|Keywords: ||local area networks|
|Issue Date: ||1997|
|Publisher: ||PERGAMON-ELSEVIER SCIENCE LTD|
|Citation: ||COMPUTERS & OPERATIONS RESEARCH, 24(4), 317-333|
|Abstract: ||Polling models are used extensively in the field of operations research to analyze the performance of a variety of systems that can be viewed as a distributed queuing system served by a single server and to evaluate their operational characteristics. In the context of computer communication, a Local Area Network (LAN) with controlled access on a single transmission media can be viewed as such a polling system in which queues are being served in cyclic order. In this article, a LAN with reverse round robin scheduling for channel arbitration, called M-net , is modeled as a discrete time Markov chain representing an asymmetric polling system. Expressions for its performance measures like average channel utilization, mean and variance of delay and blocking probability at a station are derived. For a system of M stations, the solution complexity is of the order of 2(2(M-1)). The analysis approach is applicable to both round robin and reverse round robin systems. Finally, performance measures of such a system are compared with that of Expressnet, as a representative example of round robin system. It is found that at lower arrival rates, the performance of M-net is comparable to that of Expressnet. However, with increasing values of arrival rates, M-net outperforms Expressnet. The analysis presented is applicable to the class of systems in operations research that can be viewed as multiple single buffer queues served by a server in round robin or reverse round robin fashion. (C) 1997 .|
|Appears in Collections:||Article|
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