Contiguous Frequency-Time Resource Allocation and Scheduling for Wireless OFDMA Systems with QoS Support

• Published in: EURASIP journal on wireless communications and networking Vol. 2009; no. 1
• Main Authors: Gutiérrez, I, Bader, F., Aquilué, R., Pijoan, J. L.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-01-2009
• Subjects: Applications; Communications Engineering; Engineering; Information Systems Applications (incl.Internet); Networks; OFDMA Architectures; Protocols; Research Article; Signal,Image and Speech Processing; Packet Loss Rate; Orthogonal Frequency Division Multiple Access; Packet Delay; Spectral Efficiency; Service Flow
• DOI: 10.1155/2009/134579
• EISSN: 1687-1499

The orthogonal frequency division multiple access (OFDMA) scheme has been selected as a potential candidate for many emerging broadband wireless access standards. In this paper, a new joint scheduling and resource allocation scheme is proposed for the OFDMA systems using contiguous subcarrier permutation. The proposed resource allocation algorithm provides contiguous sets of frequency-time resource units following a rectangular shape yielding a reduction on the required burst signalling. The joint scheduling and resource allocation process is divided into two phases: the QoS requirements fulfilment and the input buffers emptying status. For each phase, a specific prioritization function is defined in order to obtain a trade-off between the fairness and the spectral efficiency maximization. The new prioritization scheme provides a reduction of 50% of the 99th percentile from the delivered packets delay in case of
non real-time
services, and 30% of the packet loss rate in case of real-time services compared to the proportional fair scheduling function. On the other hand, it is also demonstrated that using the rectangular data packing algorithm, the number of required bursts per frame can be reduced up to a few tenths without compromising the performance.