Goal-Oriented Semantic Communication for Distributed ISAC-Enabled Vehicle Coordination

• URL: http://arxiv.org/abs/2607.15111v1
• Date: Thu, 16 Jul 2026 15:21:59 GMT
• Title: Goal-Oriented Semantic Communication for Distributed ISAC-Enabled Vehicle Coordination
• Abstract summary: We investigate a new scenario of distributed integrated sensing and communication (ISAC)-enabled vehicle coordination at intersections.<n>We propose a unified goal-oriented semantic communication (GSC) framework, which transmits sensing and C&C signals only when they are semantically important.<n>We show that our proposed framework achieves 100% collision-free vehicle coordination with significantly reduced signaling overhead.
• Score: 25.673562201868737
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Vehicle coordination at unsignalized intersections relies on accurate real-time vehicle state acquisition and reliable command-and-control (C&C) signal delivery. However, existing studies typically treat sensing, communication, and control separately, which may lead to redundant transmissions, outdated state information, and unreliable vehicle coordination. In this paper, we investigate a new scenario of distributed integrated sensing and communication (ISAC)-enabled vehicle coordination at intersections, where multiple roadside units (RSUs) collaboratively transmit sensing signals for vehicle state acquisition and C&C signals for vehicle movement control under the management of a central base station (BS). To improve signaling efficiency, we propose a unified goal-oriented semantic communication (GSC) framework, which transmits sensing and C&C signals only when they are semantically important for improving intersection traffic throughput. Specifically, an extended Kalman filter (EKF) is adopted to predict vehicle states and fuse distributed sensing measurements. A masked hybrid proximal policy optimization (MHPPO) framework is then developed to jointly determine sensing transmission decisions, C&C transmission decisions, and C&C signal contents based on a value-of-information (VoI) reward. Furthermore, we propose an uncertainty-aware transmission design (UTD), including robust beamforming and VoI-based time-division power allocation, to improve sensing and communication reliability under vehicle state uncertainty and inter-RSU interference. Simulation results show that our proposed framework achieves 100% collision-free vehicle coordination with significantly reduced signaling overhead compared with predictive ISAC baselines adapted from state-of-the-art related studies and several ablation baselines.

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