Message broadcast-oriented MAC (Media Access Control) layer improving method in VAENT (vehicular Ad-hoc NETwork)

The invention belongs to the technical field of mobile communication and relates to a message broadcast-oriented MAC (Media Access Control) layer improving method in an VAENT (Vehicular Ad-hoc NETwork). For a stream media message, an RTB/CTB (request-to-broadcast/clear-to-broadcast) mechanism is used to select a relay vehicle; an ARC-SMB (Adaptive Rate Control-Streaming Media Broadcasting) method is provided in order to guarantee the smoothness of receiving stream medium data by a user; according to a detected channel transmitted data frame state, a broadcast vehicle adjusts data transmitting speed, so that the packet loss rate is reduced; the concept that the user manually adjusts the quality required by a stream media is provided in order to improve the user experience. The state of broadcasting a safety message in an actual environment is simulated, so that the vehicle acquires better delivery rate, single-hop delay is reduced, and the load rate is reduced; the broadcasting state of the safety message in the actual environment can be simulated by the ARC-SMB method, so that the vehicle acquires better delivery rate, the packet loss rate is reduced, and more smooth stream media transmission is provided for the user.