Adaptive Applications and Resource Assignment in Wireless LANs Using Cross-Layer Scheduling

Konferenz: Mobilkommunikation - Technologien und Anwendungen - 15. ITG-Fachtagung
19.05.2010 - 20.05.2010 in Osnabrück, Deutschland

Tagungsband: Mobilkommunikation

Seiten: 5Sprache: EnglischTyp: PDF

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Könsgen, Andreas; Görg, Carmelita (Communication Networks, Center for Computing Technologies, University of Bremen, Germany)

In wireless LAN communications, it is crucial to meet the quality-of-service (QoS) requirements of the users. This paper introduces cross-layer communication inside a WLAN access point between the application layer which generates the traffic load and the MAC layer which has to allocate channel resources among the different users. In order to optimise the channel usage by the applications, they have to be adaptive. The task of the MAC layer is then to share the channel capacity among the users in a fair manner. It should be avoided that one user gets the maximum data rate his application requires whereas the other users only get the minimum rate which their application supports so that fairness criteria are needed. In case of poor channel conditions, it can happen that even after reducing the service to the minimum requirements for all users, the total load is still to high so that call admission control (CAC) is needed. Simulation results show that the adaptivity of the applications enhance the transmission efficiency of the Wireless LAN system.