Intelligent Transportation Systems (ITSs) are a critical application of Fifth-Generation (5 G) mobile communication technology, with Vehicular Ad Hoc Networks (VANETs) serving as a fundamental component. Although 5 G infrastructure significantly enhances connectivity, challenges persist in scenarios with limited coverage or high vehicle mobility, where Device-To-Device (D2D) communication becomes essential. VANETs further encounter unstable connectivity, rapidly changing topologies, and uneven vehicle distribution, which lead to frequent route rediscovery, excessive signaling overhead, and increased power consumption. To address these limitations, a sustainable machine learning (ML)-based routing protocol is developed that integrates 5 G and D2D communication for improved reliability and energy efficiency. This research utilizes a 5G-enabled VANET simulation environment to collect mobility, communication, and energy-related data for routing optimization. The dataset undergoes cleaning, standardization, and outlier detection to ensure reliability, while Wavelet Transform and PCA are applied for dimensionality reduction and pattern extraction. The Golden Jackal Optimization (GJO) algorithm is used for feature selection and parameter tuning, optimizing routing decisions and evaluating network connectivity through a nonhomogeneous Poisson process. Routing optimization is achieved using a novel ML model, the Extreme Kernelized Gradient Supported Machine (EKGSM), which exploits kernelized gradient learning to capture nonlinear mobility, connectivity, and energy-related patterns. The proposed model achieves an increase in packet delivery ratio (PDR), a reduction in average end-to-end (E2E) delay, a decrease in energy consumption, and a reduction in routing overhead. These outcomes establish EKGSM as an effective, scalable, and sustainable routing solution for next-generation 5G-VANET environments.
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