The openness and heterogeneity of next generation communication networks are now highlighting more security issues than those of traditional communication environments. Moreover users' security requirements can often change in mobile communication environments, depending on the situation in which the user is immersed. Our objective is to define a context-aware security framework for addressing the problems of end-to-end security on behalf of endusers. Based on context data acquisition and aggregation features, the framework uses contextual graphs to define security policies encompassing actions at different layers of communication systems' architecture, while adapting to changing circumstances.
SUMMARYWireless Local Area Networks (WLANs) represent a powerful technology for accessing data, voice and video services in mobility. The literature dealing with IEEE 802.11 WLANs optimisation for supporting real-time services performance is plentiful. IEEE Task Group E has been created with the aim of enhancing the Quality of Service (QoS) capabilities of the MAC IEEE 802.11, while several link adaptation algorithms have been proposed to optimise the rate selection in the IEEE 802.11a physical layer. In this work, the knowledge of the application type, provided by the MAC IEEE 802.11e layer, is exploited in a link adaptation strategy for the PHY IEEE 802.11a layer. The performance of the system is studied by using an event-driven simulator, which implements the specifications of the IEEE 802.11e draft standard and the IEEE 802.11a standard. Simulation results show that the proposed scheme achieves both the link adaptation advantages and the required QoS support to real-time services.
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