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A clustering-based multi-priority MAC protocol formulating method in a vehicle-mounted ad hoc network

A vehicular ad hoc, multi-priority technology, applied in network topology, network traffic/resource management, access restrictions, etc., can solve problems such as increased computational complexity and increased network delay, unsuitable for vehicular ad hoc networks

Active Publication Date: 2019-05-28
LIAONING UNIVERSITY
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AI Technical Summary

Problems solved by technology

VER-MAC allows nodes to broadcast security information once in the control period and data period, which improves the reliability of security information, but when transmitting security information, the higher computational complexity will increase the network delay
In summary, none of these protocols are suitable for the special environment of VANETs

Method used

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  • A clustering-based multi-priority MAC protocol formulating method in a vehicle-mounted ad hoc network
  • A clustering-based multi-priority MAC protocol formulating method in a vehicle-mounted ad hoc network
  • A clustering-based multi-priority MAC protocol formulating method in a vehicle-mounted ad hoc network

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Embodiment 1

[0165] The present invention will be further described below in conjunction with the accompanying drawings.

[0166] Due to the frequent dynamic changes of the topological structure of the vehicle ad hoc network and the high-speed movement of the vehicle, it is necessary to ensure that the security information accesses the channel with the minimum delay and within the tolerable range, so as to be suitable for different traffic flows and meet the needs of security applications and user applications. In accident warning and congested roads, time asynchronous and multi-priority access channel mechanisms are used to ensure timely and reliable transmission of safety messages, improve channel utilization, and reduce traffic accidents; provide passengers with some value-added services during the journey In this method, by dividing the nodes into clusters, the cluster head represents the members in the cluster to compete for channels to reserve service channels, and fewer concurrent no...

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Abstract

The invention relates to a clustering-based multi-priority MAC protocol formulating method in a vehicle-mounted ad hoc network. According to the protocol, a cluster head election algorithm based on mobile perception and a multi-priority access channel mechanism are adopted, on the premise that safety information priority access is guaranteed, the number of concurrent access channel nodes is reduced, the channel throughput is increased, and the service life of a cluster head is prolonged; Meanwhile, the invention provides a method for reserving a service channel without competition, so that a cluster head reserves the channel for active nodes in the cluster, channel conflicts are avoided, and the collision probability is reduced. Through the above technology, in the vehicle-mounted ad hoc network with the network topology structure changed frequently, the average time delay of the security information is reduced, the throughput of the service channel is increased, and the adaptability to different traffic conditions is better.

Description

technical field [0001] The invention relates to a cluster-based multi-priority MAC protocol applied in traffic, and belongs to the technical field of vehicle self-organizing networks. Background technique [0002] Vehicular Ad-hoc NETwork (VANET) is an important application of traditional mobile ad-hoc network in the field of transportation, which is realized by On-Board Unit (OBU) and Road Side Unit (RSU) Two-way communication between vehicles and vehicles, and between vehicles and roads. Based on the IEEE 802.11p standard, the American IEEE 1609 working group formulated the IEEE 1609.4 standard according to the special requirements of VANET. This standard divides the dedicated bandwidth of 75MHz into one control channel (Control CHannel, CCH) and six service channels (Service CHannel, SCH), and stipulates that the synchronization period of channel access is 100ms. Since the fixed synchronization cycle division is not suitable for the high-mobility vehicle network environ...

Claims

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Application Information

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IPC IPC(8): H04W28/02H04W28/26H04W48/10H04W74/00H04W74/08H04W84/18
Inventor 任秀丽陈梓航郭炜儒
Owner LIAONING UNIVERSITY
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