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A Metro Vehicle Communication System with Parking Nodes

An in-vehicle communication system and vehicle node technology, applied in the field of intelligent transportation systems (ITS), can solve the problems of wireless channel asymmetry, unstable link conditions, frequent changes in VANET topology, etc., to alleviate intermittent connectivity, ensure The effect of normal delivery

Active Publication Date: 2019-04-05
750 TEST SITE OF CHINA SHIPBUILDING IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the movement of vehicle nodes has regularity and high-speed mobility, which leads to frequent changes in VANET topology, unstable link conditions, and asymmetric wireless channels; thirdly, urban high-density building groups, urban road planning, Environmental factors such as relative vehicle speed and random driver behavior are environmental factors that affect connectivity

Method used

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  • A Metro Vehicle Communication System with Parking Nodes
  • A Metro Vehicle Communication System with Parking Nodes
  • A Metro Vehicle Communication System with Parking Nodes

Examples

Experimental program
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Embodiment Construction

[0025] In view of the situation that the traditional VANET has inaccurate positioning and empty routing at the intersection of urban roads, a fixed node is introduced at each intersection, such as figure 1 shown. The core part of the fixed node is a wireless transceiver with storage, forwarding, and settlement capabilities. The fixed node first uses the angle information stored in the central neighbor table in advance to determine the alternative forwarding path;

[0026] In the alternative forwarding path, a Far-reaching Detection Method (FDM) is proposed according to the present invention, such as figure 2 shown. fixed node I i Obtain and update I in real time by periodically sending handshake messages i to I i+x Delay information, select the final forwarding path with better delay performance;

[0027] Such as image 3 In the shown VANET with / without parking and forwarding mechanism, S, M, and D are mobile nodes, A, B, C, and F are parking nodes, S is a source node,...

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Abstract

The invention relates to a metropolitan area vehicle-mounted communication system with a parking node. The system is compiled throughVC6.0++, a Tcl script language and an ask analysis language in a combined way based on a network simulator NS2-2.29 and a traffic flow generation software VanetMobiSim-1.1 platform. The system is characterized in that a vehicle-mounted self-networking communication strategy carrying the parking node specific to the aim of establishing an efficient vehicle-mounted communication platform is adopted, so that the defect of intermittent connectivity in conventional VANET (Vehicular Ad hoc Network) is overcome; the metropolitan area VANET communication performance is enhanced from the aspects of increasing network effective nodes and judging the branch availability; a topologically-stable and quickly-convergent network connectivity mechanism is provided for the realization of efficient vehicle-mounted communication within a metropolitan area range; and the problem of high packet loss probability caused by random joining or exit behaviors of vehicle nodes is solved.

Description

technical field [0001] The invention relates to a metro vehicle communication system with parking nodes, which is suitable for driving in urban traffic and belongs to the field of intelligent traffic systems (ITS). Background technique [0002] The research on Vehicular Ad hoc Network (VANET) technology is carried out under the assumption that the network environment is fully connected, but in fact the VANET connectivity is usually unstable, especially in low-density areas, where communication connections Chance and randomness. Specifically, it shows two extreme characteristics: when the vehicle density is high, VANET behaves as a fully connected network; when the regional vehicle density is low, VANET behaves as an intermittently connected network. There may not be enough vehicles on some roads to support multi-hop forwarding, resulting in some nodes being split into isolated networks or isolated nodes. And vehicle nodes frequently and dynamically access and leave the net...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/12H04W40/24H04W84/18
CPCH04W40/12H04W40/24H04W84/18Y02D30/70
Inventor 时慧晶胡榕马冲
Owner 750 TEST SITE OF CHINA SHIPBUILDING IND CORP