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Cross-layer vehicular network routing method based on forwarding efficiency prediction

A technology of forwarding efficiency and vehicle network, applied in the field of communication, can solve problems such as high packet loss rate, poor performance index, high transmission delay, etc.

Active Publication Date: 2016-08-17
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high mobility of nodes under VANET and the frequent changes of network topology, traditional geographic location-based routing protocols have poor performance indicators in VANET, such as high packet loss rate, high transmission delay, etc.

Method used

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  • Cross-layer vehicular network routing method based on forwarding efficiency prediction
  • Cross-layer vehicular network routing method based on forwarding efficiency prediction
  • Cross-layer vehicular network routing method based on forwarding efficiency prediction

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Embodiment Construction

[0019] How to select the next hop node is the main research object when designing a routing algorithm based on geographic location conforming to VANET. When the traditional geographic location-based routing algorithm selects the next hop node, it selects the point closest to the target node for forwarding. On the one hand, this strategy does not take into account the transmission success rate in actual transmission, and the farther the transmission distance is, the lower the transmission success rate is; on the other hand, it does not take into account the business processing capabilities of the selected nodes.

[0020] In order to solve these two problems, the present invention proposes a routing mechanism for optimal forwarding expectations. When selecting the next hop node, first judge whether it can be sent directly to the target node, and if it can be sent to the target point, it will be sent directly to it. If not, in the set of optional forwarding points, select the no...

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Abstract

The invention discloses a cross-layer vehicular network routing method based on forwarding efficiency prediction. According to the method, through combination of an existing MAC layer access protocol, by taking transmission failure probability resulting from channel fading into consideration, an effective transmission distance of nodes in single-time transmission is defined. Moreover, through combination of time slot distribution conditions of multi-channel MAC layers access on a control channel and the data processing capabilities of the nodes, the waiting time delay of single-time transmission is defined. A forwarding frequency of single-time forwarding is defined by using the two parameters. Through prediction of forwarding efficiencies of all selectable nodes in a next hop and routing selection by taking unit time transmission distance optimization as a strategy, forwarding can be carried out by using the nodes more effectively. The method aims at improving the effectiveness of each time of forwarding; production of the low efficiency forwarding is reduced; the average end to end time delay is reduced; and a packet loss rate is reduced.

Description

technical field [0001] The invention designs a cross-layer vehicular network routing method based on forwarding efficiency prediction, which belongs to the technical field of communication. Background technique [0002] As a research direction of mobile ad hoc network (MANET), vehicular ad hoc network (VANET) has important applications in intelligent transportation system (ITS). VANET regards vehicle nodes and road infrastructure as network nodes, and mainly realizes communication between vehicles (V2V, Vehicle-to-Vehicle Communication) and communication between vehicles and roadside facilities (V2I, Vehicle-to-Infrastructure Communication). The real-time communication mobile network improves traffic safety and management efficiency, and also provides more services for vehicle driving. Due to the high mobility of vehicles, VANET has the characteristics of frequent network topology changes. In VANET scenarios, general MANET protocols are prone to network interruption, high d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/20H04L12/721
CPCH04L45/124H04W40/20Y02D30/70
Inventor 朱琦贲挹坤
Owner NANJING UNIV OF POSTS & TELECOMM
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