Vehicle-mounted ad-hoc network asynchronous multichannel MAC (media access control) access method based on time division multiplexing

A vehicle-mounted ad hoc network and time-division multiplexing technology, applied in the field of vehicle-mounted self-organizing networks, can solve problems such as control channel bottlenecks and low channel utilization, reduce the probability of collision, reduce the possibility of service packet collision, and improve network throughput. effect on volume and latency performance

Inactive Publication Date: 2014-01-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is to propose a time-division multiplexing-based asynchron

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  • Vehicle-mounted ad-hoc network asynchronous multichannel MAC (media access control) access method based on time division multiplexing
  • Vehicle-mounted ad-hoc network asynchronous multichannel MAC (media access control) access method based on time division multiplexing
  • Vehicle-mounted ad-hoc network asynchronous multichannel MAC (media access control) access method based on time division multiplexing

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[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] In order to avoid the service channel idle problem caused by strict periodic synchronization in the IEEE1609.4 standard, the present invention proposes the following solution: nodes that do not need to send and receive service information continuously monitor the control channel to obtain security information and channel coordination information; when the node wants to send When serving information, send channel reservation information. After the channel is successfully reserved, it will immediately transfer to the corresponding service channel to send the service package. After sending, it will immediately return to the control channel to continue monitoring. Unlike the IEEE1609.4 standard, it is not necessary for all nodes to swi...

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Abstract

The invention provides a vehicle-mounted ad-hoc network asynchronous multichannel MAC access method based on time division multiplexing, and relates to a mobile communication system. According to the invention, a node which is not required to transmit and receive service information is used to continuously monitor a control channel in an audio way to obtain security information and channel synergic information. The access method comprises the following steps: when a node is to send service information, transmitting channel reserving information, after reserving the channel, immediately transferring to the corresponding service channel to transmit the service information, after transmitting the service information, immediately returning to the control channel to perform audio monitoring, and solving the problems of low channel utilization and the bottleneck of the control channel. Compared to the mechanism that according to the IEEE 1609.4 standard, the channels of all nodes are synchronously switched, the vehicle-mounted ad-hoc network asynchronous multichannel MAC access method can avoid idle channel; in addition, the time division multiplexing method can solve the bottleneck problem of the control channel and reduce conflict possibility of the control channel; the node synergic method is used to reduce the influence caused by data packet collision on the service channel.

Description

technical field [0001] The invention relates to the field of vehicular ad hoc networks, in particular to a multi-channel MAC method for vehicular ad hoc networks. Background technique [0002] The Vehicular Ad Hoc Network (VANET) based on the IEEE802.11p standard is an important part of the Intelligent Transportation System (ITS). VANET adopts the dedicated short-range communication (DSRC) technology, and is committed to increasing the traffic safety factor and improving the comfort of the car occupants. sex. The U.S. Federal Communications Commission (FCC) allocated a wide 75MHz dedicated communication band for the Internet of Vehicles at the 5.9GHz frequency for inter-vehicle communication and communication between vehicles and roadside infrastructure. According to the IEEE802.11p standard, this 75MHz frequency band is divided into 7 channels, the channel in the middle is the control channel (CCH), which is used to transmit security information and control packets; the re...

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Application Information

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IPC IPC(8): H04W74/08H04W84/18
Inventor 唐伦王晨梦陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM
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