A Multi-Hop Broadcasting Method for Urban Vanet Based on Competition and Finite State Machine
A finite state machine and urban technology, applied in the field of multi-hop broadcasting, can solve the problems of lack of message confirmation and retransmission mechanism, limitations of application scenarios, inability to take into account the real-time and reliability requirements of message transmission, etc., to ensure real-time and reliable transmission Effect
Active Publication Date: 2020-08-07
WUHAN UNIV
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Problems solved by technology
Some broadcast methods rely too much on the roadside communication unit (RSU), which leads to limitations in practical application scenarios
Finally, most existing methods lack an effective message confirmation and retransmission mechanism, and cannot take into account the real-time and reliability requirements of message transmission
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[0019] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.
[0020] The nodes in the urban VANET are vehicles; according to whether they have received the broadcasted emergency message, the nodes in the urban VANET have three different states, namely: state N means that the message has not been received; state P means that the message may have been received message; state R indicates that the message has been acknowledged. The initial states of the nodes are all N, and the states of themselves and neighboring nodes are changed according to the specific events mentioned in the main steps of the present invention. Both ...
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The invention discloses an urban VANET multihop broadcasting method based on competition and finite-state machine. States of each node comprises an N state which indicates that no message is received;a P state which indicates with the message may be received; and an R state which indicates that the message is determined to be received already. A source node knowing an accident builds an emergencymessage carrying a sending node list and broadcasts the same, and sets the own state to be R; if the state of a neighbor node is N, N is changed to be P; a node receiving the emergency message firstly finds the sending node of the message and the nodes in the sending node list included by the message in a local neighbor list, and if the nodes exist, the states of the nodes are set to be R. Then the receivers compute respective waiting time according to relative distances and communication quality with the previous hop node. The node of which the waiting time ends firstly updates and broadcasts the emergency message, and the new message can be regarded as an implicit ACK. If the neighbor with the state that is not R exists, the sender may retransmit after timeout. The method provided by the invention is applicable to multiple network topologies, and ensures real-time and reliable transmission of the emergency message in the whole network.
Description
technical field [0001] The invention belongs to the technical field of vehicular ad hoc network communication, and in particular relates to a multi-hop broadcast method based on competition and finite state machine to realize real-time and reliable transmission of emergency messages in urban VANET. Background technique [0002] As an indispensable part of the intelligent transportation system, VANET (Vehicular Ad Hoc Network) is a special mobile ad hoc network with flexible networking, traceable communication node movement, rapid network topology changes, and better wireless communication channel quality. Distinctive features such as instability. The applications of VANET generally include driving safety applications and entertainment information service applications. The so-called driving safety application, specifically, is to quickly and reliably disseminate the emergency information generated by the emergency accident road section to some or all vehicles in a certain ar...
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IPC IPC(8): H04W4/06H04W4/46H04W4/90H04W40/12H04W40/20H04L1/16
CPCH04L1/1678H04W4/06H04W4/46H04W4/90H04W40/12H04W40/20
Inventor 黄传河李思政
Owner WUHAN UNIV