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1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs

A density estimation and self-adaptive technology, applied in electrical components, wireless communication, transmission systems, etc., can solve problems such as single clustering structure

Active Publication Date: 2017-12-08
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the clustering structure is single in the existing VANETs, ​​provide a kind of self-adaptive clustering method based on density estimation 1-hop and 2-hop cluster coexistence in VANETs, ​​compared with the traditional clustering algorithm ratio, this method can effectively improve the communication performance of the network

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  • 1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs
  • 1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs
  • 1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0055] Such as figure 1 As shown, in the VANETs provided by the present invention, the adaptive clustering method based on the coexistence of 1-hop and 2-hop clusters of density estimation comprises the following steps:

[0056] By getting the current position of the node (x i,t ,y i,t ), speed v i,t and acceleration a i,t It is estimated that the node is at (t+T s ) time position and speed

[0057]

[0058]

[0059] By judging (t+T s ) Euclidean distance between nodes at time Compared with the node communication radius TR, the node is at (t+T s ) estimated value of the number of 1-hop neighbor nodes at time And then calculate each node in (t+T s ) time DF, 1-hopVF and 2-hopVF are stored in the entry of each node:

[0060]

[0061] In the formula:

[0062]

[0063] is the 1-hop neighbor node set of node i, for Any node j...

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Abstract

The invention discloses a 1-hop and 2-hop clusters coexistent adaptive clustering method based on density estimation in VANETs. The method comprises the following steps: estimating the 1-hop neighbor node density in the future time, as the formula, based on the current position and current speed of a node, comparing the 1-hop neighbor node density with a threshold, and judging whether the node is suitable to form the 1-hop cluster or the 2-hop cluster, and initializing the node as a cluster head node; in each cluster, selecting a node with the minimum relative mobility, that is the formula is the minimum, as a cluster head, reducing other nodes in the cluster to cluster members, and if there are two or multiple nodes with the minimum relative mobility, then selecting a node with the minimum ID as the cluster head; and performing post maintenance of a cluster structure based on the possible situations in the network. A clustering algorithm disclosed by the invention has the advantages of being low in delay and low in packet loss.

Description

technical field [0001] The invention relates to a clustering routing protocol CBRP (Clustering Based Routing Protocol) based on minimum ID clustering in VANETs, ​​in particular to an adaptive clustering method in VANETs in which 1-hop and 2-hop clusters coexist based on density estimation. Background technique [0002] With the improvement of people's living standards year after year, the number of cars has increased sharply, the urban traffic density has increased significantly, and the problem of road congestion has become more and more serious. Therefore, with the rapid development of computer technology and communication technology, V2V communication between vehicles and V2I communication between vehicles and roadside equipment have promoted the development and upgrading of VANET. Although VANET is an application of Ad Hoc network, due to its special network environment, motion rules and application background, the wireless channel is unstable, the network capacity is li...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/02H04W40/20H04W40/22H04W84/18H04L29/08
CPCH04L67/12H04W40/026H04W40/20H04W40/22H04W84/18
Inventor 王霞武璐琪
Owner XI AN JIAOTONG UNIV
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