A Survey and Experimental Study on Neural Trajectory-User Linking Models

The popularity of location-aware devices has boosted urban systems with massive volumes of anonymous trajectory data, presenting both challenges and opportunities for enhancing smart city initiatives through Trajectory-User Linking (TUL). Typically, TUL aims to match anonymous trajectories with specific users by exploring spatiotemporal patterns and insightful mobility behaviors. However, current TUL models face significant limitations due to their reliance on singular data sources and insufficient consideration of real-world scenarios. Furthermore, these models often lack evaluation in fair and comprehensive environments, hindering accurate assessment of their performance and applicability. This paper systematically investigates prevalent challenges encountered by existing TUL models, conducts a comprehensive review of state-of-the-art models, and proposes a structured framework that encompasses three core components: point-level representation learning, trajectory-level representation learning, and user linking. Through meticulously designed experiments, we examine the effectiveness and efficiency of leading TUL models in handling the complexities of real-world data, such as data imbalance, sparsity, new users, and scalability. This in-depth analysis uncovers limitations in existing methodologies and offers guidance for future advancements, contributing to the development of robust TUL solutions for urban mobility analysis and smart city technologies.