Cross-Layer Scheduling with QoS Support over a Distributed Queuing MAC for Wireless LANs

Authors:
E. Kartsakli;J. Alonso-Zárate;L. Alonso;C. Verikoukis
Affiliations:
Signal Theory and Communications Department, Technical University of Catalonia (UPC), Barcelona, Spain;Telecommunications Technological Centre of Catalonia (CTTC), Barcelona, Spain;Signal Theory and Communications Department, Technical University of Catalonia (UPC), Barcelona, Spain;Telecommunications Technological Centre of Catalonia (CTTC), Barcelona, Spain
Venue:
Mobile Networks and Applications
Year:
2009

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Abstract

Distributed Queuing Collision Avoidance (DQCA) is an efficient MAC protocol designed for infrastructure Wireless LANs. In this paper, four algorithms are proposed that alter the FIFO scheduling order of DQCA in order to meet specific network requirements. The proposed schemes combine the efficiency of opportunistic scheduling with the QoS provisioning through service differentiation. The opportunistic policy encourages transmissions at higher rates when the channel condition is good and is implemented through a cross-layer dialogue between the PHY and the MAC layers. The key idea of service differentiation is to assign priorities to traffic flows with different requirements in order to provide QoS guarantees. The throughput, delay and jitter performance of the proposed schemes has been evaluated through simulations for a scenario with heterogeneous traffic of voice, video, best-effort and background data traffic flows.