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-The increasing use of multimedia and real time applications in the Internet requires solutions based on resource reservation to provide quality of service. However, the ineffective use of the resources damage such solutions. Thus, the establishment of traffic engineering strategies integrated with proposals of quality of service becomes necessary, aiming to solve this problem. A proposal of solution to such problem uses the preemption to prevent idle resources in the domain searching to take care of other traffics of bigger priority. In this paper, it is proposed and evaluated a LSP preemption politics implemented with fuzzy controller. The validity of the proposal is demonstrated from results obtained in an experimental study.

SUMMARYIEEE 802.16e is a telecommunication standard technology designed to support a wide variety of multimedia applications. It defines five service classes, each one with its respective QoS requirements, but does not define the scheduling algorithm for these service classes. In this paper, an adaptive packet scheduling algorithm for the uplink traffic in IEEE 802.16e networks is proposed. This algorithm is designed to be completely dynamic, mainly in networks that use various modulation and coding schemes (MCSs). The algorithm is applied directly to the bandwidth request queues in the base station (BS) and aims at supporting the real‐time and non‐real‐time applications. Using a cross‐layer approach and the states of the bandwidth request queues in the BS, a new deadlines based scheme was defined, aiming at limiting the maximum delay to the real‐time applications. Moreover, this algorithm interacts with the polling management mechanisms of the BS and controls the periodicity of sending unicast polling to the real‐time and non‐real‐time service connections, in accordance with the QoS requirements of the applications. The proposed algorithm was evaluated by means of modeling and simulation in environments where various MCSs were used and also in environments where only one type of modulation was used. The simulations showed satisfactory results in both environments. Copyright © 2012 John Wiley & Sons, Ltd.

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