Direct vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications have been popularly considered for safe\ndriving of manned or unmanned vehicles. The V2I communication is better than the V2V communication for propagating\nsafety messages at critical regions like intersections where the safety messages must be delivered to surround vehicles with low\nlatency and loss, since transmitters as infrastructure can have line of sight to the receiver vehicles and control wireless medium\naccess in a centralized manner unlike V2V. Long-Term Evolution (LTE) cellular networks are rapidly deployed in the world with\nexplosively increasing mobile traffic. As many automobile manufacturers choose LTE on-board devices for telematics, the LTE\nsystem can be utilized also for safety purposes instead of 802.11p/WAVE based roadside units (RSUs). Previous literatures have\nstudied mostly current LTE systemanalysis in aspect of theoretical network capacity and end-to-end delay to investigate feasibility of\nV2I communication. In this paper, we propose new enhancement of a current LTE system specified by 3rd-Generation Partnership\nProject (3GPP) LTE standards while addressing major delay challenges. From simulation, we confirm that our three key solutions\ncan reduce end-to-end delay effectively in the LTE system to satisfy requirements of safety message delivery.
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