A single-interface multi-channel switching method for a vehicle-mounted ad hoc network

A vehicle self-organizing, multi-channel technology, applied in the direction of network topology, wireless communication, electrical components, etc., can solve the problems of channel switching, reduce channel usage, and implementation difficulties, so as to improve service and communication quality and reduce the number of channel switching , the effect of increasing the utilization rate

Inactive Publication Date: 2015-12-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This MAC protocol focuses on two issues: channel switching and access control
Since there is no special control channel for channel switching, the synchronization requirements are strict and difficult to implement. At the same time, the service channel switching is frequent, and the uneven distribution of node density is not considered. The adaptability of the vehicle ad hoc network is poor, which reduces the channel utilization rate.

Method used

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  • A single-interface multi-channel switching method for a vehicle-mounted ad hoc network
  • A single-interface multi-channel switching method for a vehicle-mounted ad hoc network
  • A single-interface multi-channel switching method for a vehicle-mounted ad hoc network

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Embodiment

[0053] 1. Determination of node working mode

[0054] figure 1 It is a flow chart of determining three working modes of nodes in the present invention.

[0055] In this example, if figure 1 As shown, the present invention divides the working mode of the node into three modes of α, β, and γ, and the judgment methods of the three modes are as follows figure 1 shown, including the following steps:

[0056] S101: The node enters the CCH time slot;

[0057] S102: When the number of neighbors is greater than the fixed value N, the node is in a high-density area and enters step S103; when the number of neighbors is less than or equal to the fixed value N, the node is in a small-density area, and its working mode is set to γ ​​mode; where the fixed value N is based on The specific situation is determined;

[0058] S103: When the number of packets FL(n-1) counted by the service channel time slot in the previous cycle > the theoretical value of the message F, set the node working m...

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Abstract

The present invention provides a single-interface multi-channel switching method for a vehicle-mounted ad hoc network. The nodes are divided into three working modes of α, β and γ according to the node density and service information flow. According to the characteristics of different working modes, different data transmission methods are adopted. mode, under the condition of ensuring the reliable transmission of safety information, the service channel is dynamically allocated, the number of channel switching is reduced as much as possible, and the utilization rate of the service channel is improved.

Description

technical field [0001] The invention belongs to the technical field of vehicular ad hoc network communication, and more specifically relates to a single-interface multi-channel switching method of a vehicular ad hoc network. Background technique [0002] Vehicular Ad-Hoc Network (VENET for short) is a typical representative of wireless communication technology applied to vehicles. It can provide traffic safety information to reduce the probability of traffic accidents. Drivers can query in real time through the terminal equipment installed on the vehicle Traffic information, itinerary planning in advance, reasonable diversion, relieve urban traffic pressure, and VENET can also provide users with rich Internet services. However, in an environment that requires Quality of Service (QOS) guarantees, especially in VENET, vehicles move at high speed, the topology changes frequently, and the Medium-Access-Control (MAC) protocol for single channel and channel competition Facing ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04W84/18
Inventor 廖丹杨晓玲孙罡许都虞红芳陆川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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