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Virtual carrier sense networking communication method based on half-duplex channel

A communication method and technology of virtual carrier, which is applied in the field of virtual carrier sensing network communication, can solve the problems of packet loss and difficult implementation of simultaneous multi-voice transmission

Inactive Publication Date: 2015-01-28
BEIFANG LIANCHUANG COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of packet loss and difficult realization of simultaneous multi-voice interpretation due to media competition in the multi-voice simultaneous interpretation network, the present invention proposes a half-duplex channel-based application layer networking communication method and its software implementation, without reducing the Under the premise of channel utilization, based on the application layer to avoid packet collision on the shared medium, to achieve reliable data simultaneous transmission function in a multi-node network environment

Method used

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  • Virtual carrier sense networking communication method based on half-duplex channel
  • Virtual carrier sense networking communication method based on half-duplex channel
  • Virtual carrier sense networking communication method based on half-duplex channel

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1: In order to realize the function of multi-voice simultaneous interpretation, the steps of using the virtual carrier sense networking method on the half-duplex channel are as follows:

[0046] Step 1: Select 12 network nodes and connect them in series through power lines. The network node application CPU 301 is Samsung's ARM CPU S3C2440, running a Linux operating system. The link CPU302 is a MAXQ microcontroller, which runs a single-chip program. The communication interface is a serial port:

[0047] Step 2: Write application CPU software 304 and link CPU software 305 on application CPU 301 and link CPU 302 according to the algorithm flow chart and interface protocol. Key message interaction during node power-up (such as Figure 5 shown), including: (1) The application layer initializes the communication interface parameters 501 and the link layer initializes the communication interface parameters and starts the trickle timer 507. The timer accuracy is 10...

Embodiment 2

[0050] Example 2: In step 1, more nodes can be selected to expand the network capacity to 24 nodes. The application CPU 301 can be an intel series CPU, and the operating system is Windows XP. The inter-board interface can be a network port.

[0051] In step 2, you can change and increase the transmission rate of the line to 100kbps, that is, change the working mode to CENELEC C; set the trickle timer period to 20ms. After the line rate and network capacity are increased, the virtual carrier sense method can be used to form a network, and the multi-voice simultaneous interpretation function of the large-capacity network can be completed on the half-duplex channel.

[0052] Others are as in Example 1.

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Abstract

The invention discloses an application layer networking communication method based on a half-duplex channel and provides a virtual carrier sense networking communication method based on the half-duplex channel, wherein a virtual carrier sense networking algorithm and a virtual carrier sense networking protocol are included. According to the virtual carrier sense networking algorithm, network nodes of sharing the half-duplex channel are logically divided into master nodes and slave nodes, the master nodes periodically send virtual carrier sense messages to the slave nodes through a drip timer, and the slave nodes match destination addresses of the received virtual carrier sense messages with networking node addresses of the slave nodes. According to the virtual carrier sense networking protocol, an interplate interface adopted for transmitting a protocol message is determined; the format of the protocol message is defined, and constituent elements of an interface message between an application layer and a link layer are stipulated; the message type of a networking control protocol is defined; the drip timer is realized. The virtual carrier sense networking communication method is applied to networking control software in a synchronous data voice transmission network, can increase the utilization rate of the half-duplex channel, provides enough handling capacity for application of synchronous data voice transmission, and achieves the reliable synchronous data voice transmission function in a network environment.

Description

Technical field [0001] The present invention involves the field of network communication technology, and specifically involves a half -double -based channel -based virtual carrier listening to network communication method. Background technique [0002] In the field fixed or mobile command communication system, low -speed semi -dual -speed industrial channels such as electric lines or radio are usually used for multi -node networking.Regardless of the formation of a string network, or a star network or a hybrid network, all communication nodes share the same transmission medium, and the shared semi -dual -industrial channel networking communication introduces the group collision rate and media competition that cannot be ignored.The CSMA / CD method based on physical carriers in the traditional network cannot complete a reliable collision detection due to the semi -dual -work characteristics of the channel. The method of dividing the time clearance transmission will seriously reduce ...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04W4/10H04B3/54
CPCH04W4/10H04L43/0817H04L69/329H04W76/10
Inventor 李石兵康靖黄福莲黄光华郭小荣董均榆
Owner BEIFANG LIANCHUANG COMM
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