Interference Hypergraph-Based Resource Allocation (IHG-RA) for NOMA-Integrated V2X Networks

TLDR

Vehicular communication networks demand ultrahigh data rates and ultralow latency, and NOMA is seen as a promising technique to boost spectral efficiency and reduce transmission delay in 5G systems. This work introduces NOMA into device‑to‑device‑enhanced vehicle‑to‑everything networks, enabling spatial‑reuse‑based resource sharing under centralized management. To capture the complex interference from NOMA and spatial reuse, an interference hypergraph is constructed and an IHG‑based resource allocation scheme using a cluster‑coloring algorithm is proposed to assign resource blocks efficiently with low computational cost. Simulations demonstrate that the IHG‑RA scheme improves the network sum rate for NOMA‑V2X communications.

Abstract

Vehicular communication network is a core application scenario in the fifth generation (5G) mobile communication system which requires ultrahigh data rate and ultralow latency. Most recently, nonorthogonal multiple access (NOMA) has been regarded as a promising technique for future 5G systems due to its capability in significantly improving the spectral efficiency and reducing the data transmission latency. In this paper, we propose to introduce NOMA in device-to-device-enhanced vehicle-to-everything (V2X) networks, where resource sharing based on spatial reuse for different V2X communications are permitted through centralized resource management. Considering the complicated interference scenario caused by NOMA and spatial reuse-based resource sharing in the investigated NOMA-integrated V2X (NOMA-V2X) networks, we construct an interference hypergraph (IHG) to model the interference relationships among different communication groups. In addition, based on the constructed IHG, we further propose an IHG-based resource allocation (IHG-RA) scheme with cluster coloring algorithm, which can lead to both effective and efficient resource block assignment with low computational complexity. Simulation results verify the efficiency of our proposed IHG-RA scheme for NOMA-V2X communications in improving the network sum rate.