Cooperative MAC protocol implementation method on basis of multiple asynchronous channels in vehicular vdhoc networks

Abstract

The invention discloses a cooperative MAC protocol implementation method on the basis of multiple asynchronous channels in vehicular vdhoc networks, and belongs to the technical field of vehicle-mounted wireless communication. The cooperative MAC protocol implementation method on the basis of the multiple asynchronous channels in the vehicular vdhoc networks comprises a method for selecting cooperative relay nodes, a multi-channel selection and coordination strategy and a retransmission mechanism of emergency messages and handshake messages. According to the cooperative MAC protocol implementation method on the basis of the multiple asynchronous channels in the vehicular vdhoc networks, mutual cooperation between the nodes is carried out, channel state information and other node state information can be obtained, and the problem that hidden terminals of the multiple channels exist in the transmission process is well solved; due to the retransmission mechanism of the cooperative relay nodes, nodes working in other service channels can also receive lost information of a control channel, reliable transmission of data in the highly-mobile environment is achieved, and communication reliability and the network throughput are improved.

Description

technical field [0001] The invention belongs to the technical field of vehicular wireless communication, and relates to a method for realizing a cooperative MAC protocol based on asynchronous multi-channel in a vehicular ad hoc network. Background technique [0002] As an important branch of the mobile wireless ad hoc network (MANET), the vehicle-mounted ad hoc network (VANET) is designed to form a network through rapid mutual communication between vehicles driving along the road, and between vehicles and fixed access points. A convenient, low-cost, and open-structured wireless mobile ad hoc network provides open public road traffic safety services and security-independent services such as traffic information inquiries, personal communications, electronic map updates, entertainment downloads, and Internet information. [0003] According to the IEEE802.11pMAC protocol, WAVE (Wireless Access in Vehicle Environment) nodes need to compete for channels to send data on both the co...

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Problems solved by technology

However, the disadvantage of this scheme is that the problem of hidden terminals caused by asynchrony is aggravated, and the nodes participating in the communication on the service channel cannot receive the emergency messages on the control channel and the handshake messages from other nodes, resulting in the loss of emergency messages and correct Obtaining available service channels is not guaranteed and not highly reliable

[0006] In recent years, research at home and abroad has achieved certain results, but there are still the following problems: under the premise of ensuring security, real-time and reliable transmission of control information, there is a high channel utilization rate and network throughput of business channels

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