An Opportunistic Scheduling Scheme with Minimum Data-Rate Guarantees for OFDMA

Abstract—We tackle the problem of providing minimum datarate guarantees for different classes-of-service in an OFDMAbased network, while obtaining a high system throughput. Our approach is based on the principles of opportunistic scheduling, leveraging multiuser and frequency diversity. By giving a higher priority for transmission to the users that have the instantaneous channel quality better than their respective average value over a time window, we add an additional degree of liberty for the packet scheduler: time diversity. Using this user-centric approach instead of a system-centric one, simulations have shown that the proposed algorithm always succeeds in fully meeting the guaranteed datarates for all users, even under heavy loads. The size of the time window over which guarantees are provided allows for a flexible control of both the hardness of the guarantees provided and the level of the delays introduced. We present performance metrics of our low-complexity heuristic in co...

• Type: Conference
• Year: 2008
• Where: WCNC
• Authors: Razvan Pitic, Antonio Capone
• Keywords: Minimum Datarate Guarantees, Respective Average Value, Time Window, WCNC 2008, Wireless Networks