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In this paper, we propose a utility-approached radio resource allocation (RRA) algorithm for downlink transmission in orthogonal frequency division multiple access (OFDMA) cellular systems. The proposed utility-approached RRA algorithm is to efficiently allocate the radio resource to mobiles according to a utility function, which contains a rate-power function, a QoS function, and a priority function to ensure QoS requirements among heterogenous services and improve the system throughput. Also, a simulated-annealing (SA) method is applied to find out the solution within a reasonable time. Simulation result shows that the proposed utility-approached RRA algorithm can allocate the radio resource efficiently and guarantee the QoS requirements of each user under the power constraints of the OFDMA system.
Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st (Volume:3 )
Date of Conference: 30 May-1 June 2005