Subcarrier allocation algorithm based on user demand for SC-FDMA system

This paper investigates the Dynamic Subcarrier Allocation (DSA) issue in Long Term Evaluation (LTE) uplink. Many researches pay more attention on maximizing the system throughput or improving the fairness between multi-users, however, they ignored the user actual spectrum demand. In this paper, an improved subcarrier allocation scheme has been proposed, which considers the user demand of quality of services (QoS) especially the demand of transmission capacity. In this paper we study on how to satisfy the users´ capacity demand with also to guarantee throughput to some extent. The scheduler allocates a chunk to the user with largest capacity demand in greedy way and renews all the users´ requests before the next allocation, so that the algorithm can meet users´ demand as far as possible. By making a comparison with other existent allocation algorithms, we can see that the proposed algorithm achieves better demand satisfaction without computational complexity increase through exhaustive simulations.