Dynamic Subcarrier Allocation with Strict Service Rate Control for Cross-Layer Utility Maximization in SC-FDMA System

A Dynamic Sub carrier Allocation with Strict Service Rate Control algorithm is proposed for single carrier frequency division multiple access (SC-FDMA) system. Aiming at eliminating the service rate waste and improving the spectral efficiency in heterogeneous traffic environment, the strict service rate constraint (SSRC) algorithms is designed by directly introducing the service rate constraint into the objective functions. Furthermore, a first in first out (FIFO) queuing model is found on the cross-layer pattern with finite space. By taking the strict service rate constraint as the necessary condition for optimality, the SSRC algorithm achieved approximate average delay and loss probability performance as max-delay-utility (MDU) algorithm, significantly outperformed the traditional algorithms such as the proportional fair (PF) algorithm and the modified largest weighted delay first (MI-LWDF) algorithm with much lower service rate waste probability. Thus, the SSRC algorithm effectively eliminated the service rate waste without the scheduling performance loss.