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Power line communication system and power line communication device

A power line communication, power line technology, applied in the application of power line communication, distribution line transmission system, transmission system and other directions, can solve problems such as inability to communicate

Inactive Publication Date: 2010-08-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, fluctuations in transmission quality due to noise or impedance fluctuations are not only a problem between communicating terminals
That is, in the power line communication, if the control signal from the controller cannot be received, even in the state where the signal can be transmitted and received with the terminal of the communication partner, there may be a problem that communication cannot be obtained because the control signal cannot be obtained.

Method used

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  • Power line communication system and power line communication device
  • Power line communication system and power line communication device
  • Power line communication system and power line communication device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0066] 1 is a diagram showing an example of a connection relationship of power line communication devices (hereinafter referred to as terminals) in a power line communication system 100 according to Embodiment 1 of the present invention. In this example, terminals performing power line communication, that is, a terminal 110 , a terminal 120 , and a terminal 130 (respectively described as a terminal A, a terminal B, and a terminal C in the figure) are connected to each other via a power line 140 . There are multiple systems in the power line 140 and power is supplied from the outside via a circuit breaker 150 .

[0067] In addition, in this example, devices 160 to 170 that operate by receiving power supply from power line 140 are also connected to power line 140 although they are not devices that perform power line communication.

[0068] (Structure of each terminal)

[0069] Among the terminals 110 to 130, the terminal 130 is a terminal that cannot be a controller.

[0070] ...

Embodiment approach 2

[0113] In Embodiment 2 of the present invention, an example of a power line communication system in which a controller is determined in consideration of a reception state in addition to the number of reception terminals will be described.

[0114] Also, in the present embodiment, FIG. 1 is used as an example of a power line or a connection relationship of each terminal.

[0115] (Structure of each terminal)

[0116] In this embodiment, the terminal that can be a controller is the same number of terminals that can be communicated by the current controller and the number of terminals that can communicate with the own terminal when the own terminal is not the controller. When the maximum error rate (error rate) of communication with other terminals is lower than the maximum error rate of communication between the current controller and other terminals, the authority of the controller can be obtained.

[0117] In order to realize this function, first, each terminal in the power l...

Embodiment approach 3

[0171] In Embodiment 3 of the invention, an example of a power line communication system capable of securing a communication speed of a certain level or higher between predetermined terminals will be described. Here, each terminal is configured as follows.

[0172] First, even in this embodiment, each terminal in the power line communication system is configured to transmit a bit error rate of a test signal in addition to the reception notification signal.

[0173] A terminal that can be a controller can set an upper limit value of an allowable bit error rate (referred to as an upper limit error rate) in order to ensure a communication speed higher than a certain level.

[0174] Furthermore, the terminal capable of serving as the controller is configured to hold the maximum value of bit error rates received from other terminals.

[0175] Also, in this embodiment, the controller outputs a test signal when the number of terminals in the power line communication system changes. ...

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PUM

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Abstract

A controller is so configured as to transmit to other terminals the number of controller receiving terminals or the number of terminals with which the controller can communicate. Each terminal other than the controller among the terminals that can serve as a controller transmits to the controller a signal indicating a controller change request and acquires a controller right, when the number of terminals with which the each terminal can communicate is greater than the number of the controller receiving terminals.

Description

technical field [0001] The present invention relates to a power line communication system using a power line in a house, and a power line communication device used in the power line communication system. Background technique [0002] In the power line communication system, a power line provided for supplying electric power is used as a communication medium. As a result, noise or impedance fluctuations occur in devices connected to the power line to receive power supply, and the transmission quality of power line communication fluctuates greatly. In particular, even if only the power of a device connected to a power line for receiving power supply is turned on or off, noise and impedance fluctuations occur, so the state of communication (transmission quality) tends to fluctuate frequently. [0003] For this change in transmission quality, the node that can obtain the optimal transmission quality is dynamically changed as the master node, and optimal routing can be easily rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04B3/54
CPCH04B2203/5408H04L12/403H04B2203/5445
Inventor 丸冈智彦
Owner PANASONIC CORP