Dynamic Resource Allocation Algorithm for Interference Mitigation based on NOMA in UDN Network operating in both Uplink and Downlink

Abstract The new notion of Internet of Vehicles (IoV) supports Vehicle-to-Everything (V2X) communications, which play a very important role in 5G systems. Non-orthogonal multiple access (NOMA) and Ultra-Dense-Network (UDN) and are two important technologies to meet the requirements of V2X services with their remarkable capacity. However, the concept of NOMA technology, which allows multiple vehicles to be served by the same resource, can lead to interference between different active users. In addition, the dense deployment of small base stations (SBS) in UDN, causes severe interference and degrades the network performance. To solve these problems, interference mitigation is widely used to avoid interference in NOMA-based UDN. In this paper, we suggested a dynamic resource allocation algorithm named Intra-cell-Inter-cell Interference Mitigation for V2X communication for UDN in uplink and downlink sense (Intra-Inter IMVN). Our algorithm aims to achieve five principals objectives, namely applying the same algorithm for both downlink and uplink modes, reducing the degree of interference, improving network performance in terms of throughput and error rate, minimizing cost and delay when using this alternative, combining dynamic metrics to support many V2X scenarios and requirements, and dealing with two types of interference such as intra-cell interference and inter-cell interference. Simulation results show that our proposed Intra-Inter IMVN algorithm outperforms the other recent approaches taking into account different parameters such as the number of users who can share the same resource and the number of available resource blocks.