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In this paper, Long-Term Proportional Fair (LTPF) resource allocationalgorithm in dynamic OFDMA system is presented, which provides long-term QoSguarantee (mainly throughput requirement satisfaction) to individual user andfollows every user's QoS profile at long-term by incremental optimization ofproportional fairness and overall system rate maximization. The LTPF algorithmdynamically allocates the OFDMA sub-carriers to the users in such a way that inlong-term the individual QoS requirement is achieved as well as fairness amongthe users is maintained even in a heterogeneous traffic condition. Here morethan maintaining individual user's instantaneous QoS; emphasis is given tofollow mean QoS profile of all the users in long-term to retain the objectivesof both proportional fairness and multi-user raw rate maximization. Compared tothe algorithms, which provide proportional fair optimization and raw-ratemaximization independently, this algorithm attempts to provide both kinds ofoptimizations simultaneously and reach an optimum point when computed inlong-term by exploiting the time diversity gain of mobile wireless environment.

Long-Term Proportional Fair QoS Profile Follower Sub-carrier Allocation Algorithm in Dynamic OFDMA Systems