Multiple QoS support using M-LWDF in OFDMA adaptive resource allocation

In this paper, we consider multiple quality of service (QoS) support by using modified largest weighted delay first (M-LWDF) discipline in the adaptive resource allocation of the orthogonal frequency division multiplexing (OFDM) multiple access (OFDMA) systems. We propose a M-LWDF (M Andrews et al., Feb. 2001) based on subchannel assignment, which can satisfy different QoS requirements of services including delay-sensitive and data rate-sensitive traffics in OFDMA systems. The simulation shows that the proposed M-LWDF based subchannel assignment provides controlled QoS provisions while maintaining both the stability of scheduling discipline and the flexibility of the multiple QoS support.