Cooperative MAC protocol implementation method on basis of multiple asynchronous channels in vehicular vdhoc networks
A vehicle-mounted self-organization and protocol implementation technology, applied in wireless communication, using return channels for error prevention/detection, electrical components, etc., can solve the problem that the available service channel for emergency messages cannot be guaranteed, the problem of hidden terminals is exacerbated, and cannot be received. Handshake messages and other issues to achieve the effect of improving communication reliability, reducing collision probability, and high effectiveness
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[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0030] The present invention proposes an asynchronous multi-channel MAC protocol based on cooperation under a VANET environment, specifically including the following contents:
[0031] Construct the data frame format. According to the existing 802.11p frame format, the data frame in the frame format is set as S-DATA (only data packets are stored) and R-DATA (data packets to be forwarded), so that they carry the parameters required for relay selection. Such as figure 1 As shown, it is a schematic diagram of the modified frame format, where FrameControl represents frame control; Duration represents duration, which is used for network allocation vector (NAV) calculation; SequenceControl represents sequence control, which is used to represent the order of different segments in the same frame, and is used Used to identify packet copies; CSC me...
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