In this article, we study the problem of resource allocation in a tri-sectoral cell in order to have an equal distribution of resources among users taking into account the OFDM transmission technique that has evolved in future wireless networks LTE and 5G. We propose a new strategy for resource allocation schemes able to help the users with a critical position thanks to hybridization PSO-PFS (Particle Swarm Optimization). In addition, PFS (Proportional Fair Scheduling) it take into consideration the channel state conditions of the users and the PSO algorithm provides an optimal solution to the allocation problem and improves the performances of users according to their stat. The simulation results show that the allocation of resources by the PSO-PFS hybrid algorithm guarantee a high throughput of the system by ensuring fairness between users.