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VANET broadcast method based on extra degree

An additional, broadcast message technology, applied in the field of broadcast communication, can solve problems such as density changes, inability to meet application requirements, etc., to reduce conflicts and competition.

Inactive Publication Date: 2012-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a VANET broadcasting method based on additionality, to solve the problem that the fixed threshold-based vehicular wireless ad hoc network broadcasting communication method cannot meet the application requirements when the density changes frequently

Method used

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  • VANET broadcast method based on extra degree
  • VANET broadcast method based on extra degree
  • VANET broadcast method based on extra degree

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Experimental program
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specific Embodiment approach 1

[0010] Specific implementation mode one: this implementation mode comprises the following steps:

[0011] In VANET broadcasting, when the upper-layer application protocol in the network has a broadcasting requirement, the vehicle executing the application acts as the source node to initiate the broadcasting communication. 1. The vehicle node as the source node sends a broadcast message; 2. After receiving the broadcast message for the first time, each vehicle node will ask its neighbors whether they have received the broadcast message, and wait for the neighbor node to reply after the query is sent. The time is T 1， Neighboring nodes that have not received this broadcast message are considered new coverage nodes, and the query node will calculate the extra degree of the query node based on the number of responses from the new coverage node to itself, as the basis for forwarding arbitration; 3. Each vehicle node wait for a while T 2， , to see if there are other nodes with gre...

specific Embodiment approach 2

[0052] Embodiment 2: In the VANET network, sometimes the nodes cannot communicate due to the reasons of the vehicle itself, or the communication link between the nodes is temporarily invalidated due to the occlusion of the building. In order to reduce the impact of node and link failures on the effect of protocol broadcasting, the present invention has been extended to enhance the design of reliability, by selecting redundant forwarding nodes to tolerate the impact of key node failures and key link failures on information transmission,

[0053] Reliability parameter: A parameter used to determine the number of forwarding nodes each time. This parameter is set by the source node according to the importance of the transmitted information, and is transmitted with the broadcast packet. Denoted as RL.

[0054] At each hop, a redundant forwarding node is selected according to the RL set by the source node, so that there is still a backup node for forwarding when the elected forward...

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Abstract

The invention relates to a VANET broadcast method based on an extra degree and to broadcast communication method of a VANET. According to the invention, a problem that a VANET broadcast communication method that is based on a fixed threshold can not meet an application demand when a density and a frequency change is solved. The method comprises the following steps that: a source node emits a broadcast message; after each vehicle node receives the broadcast message for the first time, each the vehicle node inquiries whether a neighboring node has received the broadcast message and an extra degree of the inquired node is calculated according to a response; a vehicle node whose extra degree exceeds a threshold declares an extra degree of the declaring node; a vehicle node that has received the declaration extracts the extra degree in the declaration and makes comparison between the extracted extra degree and an extra degree of itself; if the extra degree that is declared by the declaring node is large, the node that received the declaration does not participate in forwarding of the broadcast message; if not, a declaration on the compared result is emitted and the extra degree of the node that received the declaration is declared; and if the node that emits the declaration on the compared result still can not receive a declaration on an extra degree that is greater than the extra degree of the node itself, the node forwards the broadcast message.

Description

technical field [0001] The invention relates to a broadcast communication method of VANET (Vehicle Ad Hoc Network). Background technique [0002] VANET uses vehicles on the road as nodes, so that the performance of its network protocol is closely related to the status of traffic flow. In road traffic, sometimes the traffic flow presents the characteristics of free flow, that is, vehicles can travel freely. In free traffic flow, the node density is not saturated, and its density will change within a certain range. (Of course, the density change will not cause the network to break. Even, that is to say that the research carried out by the present invention is still based on the assumption of network connectivity.) And this node density change will have an impact on the performance of the broadcast protocol, and some existing broadcast strategies based on fixed parameters cannot meet the traffic conditions of this density change The following broadcast communication needs. ...

Claims

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Application Information

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IPC IPC(8): H04W4/06H04W84/18
Inventor 崔刚周连科朱东杰王秀峰付忠传暴建民莫毓昌张策张必英刘永文
Owner HARBIN INST OF TECH
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