Sporadic Ultra-Time-Critical Crowd Messaging in V2X

Life-critical warning message, abbreviated as is a special event-driven message that carries emergency information in Vehicle-to-Everything (V2X). Three important characteristics distinguish messages from ordinary vehicular are sporadicity, crowding, and ultra-time-criticality. Specifically, come only once while sporadic manner; however, when they come, tend to crowd need be delivered short order. This paper puts forth medium-access control (MAC) protocol for messages. The overall MAC operates by means of interrupt-and-access. To circumvent potential inefficiency arising we adopt an override network architecture whereby on the spectrum A vehicle with first sends interrupt signal pre-empt transmission messages, so can use wireless originally allocated In this way, no exclusive resources pre-allocated Following interrupt, transmissions ultra-time-critical employ advanced channel access techniques ensure reliable delivery within ultra-short time order 10 ms.