over the past few years, wireless communication needs have experienced continuous growth. there is now a great demand for more sophisticated infrastructure to cope with the fifth generation and beyond (5g+) systems. 5g+ systems promise to provide better real-time services, more efficient spectrum utilization, increased energy efficiency, and enhanced coverage. 5g+ systems are expected to adopt several adaptations in their network architecture, construction, and deployment. the integration of network flying platforms (nfps) with 5g+ capabilities will allow much higher connectivity, lower latency, and quicker transfer of high-precision data. this aggregation of 5g+ networks and nfps is robust, paving the way to the introduction of many new capabilities and improvements in wireless applications. resource allocation in wireless communication systems is one of the most critical issues when it comes to utilizing systems efficiently. in 5g+ cellular technology, the main research focus is on spectral efficiency, network throughput, and communication delays. furthermore, this focus will continue to the next generation cellular systems. to support the communication of various internet of things (iot) devices, especially unmanned aerial drones and balloons, next-generation cellular systems (5g+) will play a vital role. however, resource allocation will be a significant determinant in the effective use of such communications. increasing network capacity while minimizing interference will be a significant research challenge. a different level of quality of service (qos) for individual user levels will also need to be satisfied. in this thesis, nfps as aerial hubs are considered in future 5g+ networks to provide fronthaul connectivity to small cells (scs)/ user equipment (ue). this thesis has different objectives. the first objective is to find the near optimal association between the nfps and scs to maximize the total sum rate subject to qos, bandwidth, and the supported number of links constraints. the second objective is to study the association problem of scs with nfps in order to minimize the system interference while taking into consideration the number of nfp links, the nfp’s maximum bandwidth, and the target data rate. the final objective is to deploy multiple uavs for serving a group of ues on the ground to maximize the total uploaded rate among all ues by jointly optimizing the uavs-ues association, the ues transmit power, and the uavs trajectory