Internet of Vehicle (IoV) is playing an increasingly important role in constructing an Intelligent Transport System (ITS) of safety,\nefficiency, and green. Safety applications such as emergency warning and collision avoidance require high reliability and timeliness\nfor data transmission. In order to address the problems of slow response and local broadcast storm commonly existing among\nwaiting-based relay schemes of emergency messages, a local topology information sensing technology-based broadcast (LISCast)\nprotocol is proposed in this paper, making use of the advantage of probability-based forwarding scheme in redundancy inhibition.\nAccording to the beacon broadcasted periodically between vehicles, LISCast collects information about number and distribution\nof neighbor, from which the characteristic information such as effective candidate number, maximum forwarding distance, and\nglobal traffic density are extracted. Through embedding the characteristic information into the head of broadcast packets by the\nmessage sender for assisting in making relay decision, the alternative receivers uniformly schedule forwarding priorities in a\ndistributed and adaptive way. LISCast works without the help of a roadside unit and generates a little more overhead. The\nsimulation results show that LISCast improves the ability to adapt to dynamic topology by optimizing the performance of delay,\nredundancy, and broadcast efficiency upon the condition of satisfying the high level of transmission reliability.
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