Method for optimizing transmission relay node of vehicular network emergency security message

A security message, vehicle node technology, applied in the field of vehicle network, can solve the problems of information transmission loss, vehicle node signal interference, unstable link status, etc.

Active Publication Date: 2017-06-13
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a real urban vehicle network environment, the communication of vehicle nodes often results in unstable l

Method used

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  • Method for optimizing transmission relay node of vehicular network emergency security message
  • Method for optimizing transmission relay node of vehicular network emergency security message
  • Method for optimizing transmission relay node of vehicular network emergency security message

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] The present invention carries out simulation experiment on vehicle-mounted network simulation software NS2 (Network Simulator), and the simulation parameter of configuration is as follows:

[0197]

[0198] The comparative test of the present invention has p-persistent protocol (translation is P persistence protocol), that is, neighbor nodes broadcast with arbitrary probability P, and do not broadcast with 1-P; flooding protocol (translation is flooding broadcast protocol), that is, each receiving All nodes that receive emergency safety messages will broadcast; the SRP protocol (translated as the closest node restriction protocol), a routing protocol based on the farthest first priority, that is, the farther the vehicle node is from the source vehicle node, the higher the probability of forwarding. The experimental results are as follows: Figure 4 shown.

[0199] The effective delay refers to the time required for the emergency safety message to be broadcast to a di...

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Abstract

The invention discloses a method for optimizing a transmission relay node of a vehicular network emergency security message. The method comprises the steps of: constructing a neighbor set belonging to any one vehicular node by periodically broadcasting a HELLO message; adding neighbor nodes by judging whether a new HELLO message is added; obtaining relay weights by processing expected transmission distances, expected transmission times, expected transmission speeds of the neighbor nodes and combining with probability weights of an emergency security message received by the vehicular nodes; and finally selecting neighbor nodes corresponding to the first three relay weights to forward the emergency security message. The method for optimizing the transmission relay node of the vehicular network emergency security message solves a problem of vehicular network broadcast "broadcast storm" under a city environment, and can broadcast the emergency security message as soon as possible.

Description

technical field [0001] The present invention relates to a vehicle-mounted network in an urban environment, more particularly, to a preferred method for transmitting relay nodes of emergency safety messages in a vehicle-mounted network. Background technique [0002] In the vehicle-mounted network in the urban environment, due to the high density of vehicles, if a message is in the process of broadcasting, if the relay is not restricted, each vehicle node that receives the message will broadcast again, which will cause the message to be transmitted in a short time. The large-scale copying and broadcasting of message messages in the vehicle network occupies a large amount of bandwidth, causing the network transmission to fail to operate normally, or even completely paralyzed. This is the phenomenon of "broadcast storm". In the vehicular network, the method of reducing relay nodes is usually used to suppress the phenomenon of "broadcast storm". [0003] The main application of ...

Claims

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Application Information

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IPC IPC(8): H04W40/02H04W40/22H04L29/08
CPCH04L67/12H04W40/023H04W40/22Y02D30/70
Inventor 蒲菊华赵永会陈虞君刘伟麟王元宏熊璋
Owner BEIHANG UNIV
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