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VANET (vehicular ad-hoc network) media access control method

A media access control and control code technology, applied in the Ad-hoc network field, can solve problems such as complex code channel allocation, node access delay, low throughput rate, etc., to adapt to changes in dynamic topology and reduce access The effect of delay and node number reduction

Inactive Publication Date: 2012-09-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a VANET media access control method to solve the problems of timely broadcast of traffic safety information in the vehicle ad hoc network and complex code channel allocation in P2P communication, node access delay, and low throughput rate technical issues

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  • VANET (vehicular ad-hoc network) media access control method

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Embodiment Construction

[0038] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0039] The application of the VANET media access control method of the present invention is based on: (1) the entire vehicle self-organizing network has a known route, so the communication request destination of the node is limited to the node within the communication range, that is, the next hop node of the route, rather than The final destination node; (2) The DS-CDMA system can provide N+2 available pseudo-random codes, and the codes are strictly orthogonal, where C m For the control code channel, C b is the broadcast code channel, and the rest C 1 to C N for the data...

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Abstract

The invention discloses a VANET (vehicular ad-hoc network) media access control method. The VANET media access control method comprises the following steps of: distributing a special code path, namely a broadcasting code path, for broadcasting traffic safety information; dividing a busy-tone channel from a physical channel, so that a node transmits a busy-tone signal to notify a neighbor node that a current broadcasting code channel is occupied through the busy-tone channel, therefore, the problem of a hidden terminal on the broadcasting code channel is solved; simultaneously, placing a traffic safety information broadcast on a preferential position so as to ensure the timeliness of the traffic safety information broadcast; avoiding the increase of a window selection region by selecting K time slots as an advanced preferential competition time slot, and reducing the probability of selecting windows with the same size through a plurality of nodes so as to reduce confliction probability and reduce node access delay; simultaneously, integrally planning the time to be periodical control frames and data frames so that node-associated information can be periodically updated and can better adapt to the change of a vehicle network dynamic topologic structure; and finally, effectively improving the network throughput rate of the VANET by utilizing a DS-CDMA (direct sequence -code division multiple access) multi-address access advantage.

Description

technical field [0001] The invention belongs to the technical field of Ad-hoc networks, and more specifically relates to a method for controlling media access of a vehicle ad hoc network (Vehicular Ad-hoc Networks, VANET for short). Background technique [0002] At present, the important applications of the vehicle self-organizing network VANET mainly include two parts: one is the application to improve traffic safety, which requires traffic safety information to be transmitted between nodes in a fast and timely manner; the other is the application to improve traffic efficiency and comfort, which requires the network It can support the transmission of large amounts of data between nodes. To realize such a dual application, the biggest challenge lies in the MAC protocol, how to build a unified MAC (Media Access Control, Media Access Control) protocol that effectively supports these two applications, how to allocate and utilize wireless channel resources reasonably, how to Ne...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 邝育军蔡凤梅
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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