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Power line carrier communication system and communication method

A technology of power line carrier and communication system, which is applied in the direction of distribution line transmission system, transmission system, digital transmission system, etc. It can solve the problems of communication reliability, low communication efficiency, and fixed transmission rate, etc., so as to improve communication reliability and the effect of communication efficiency

Inactive Publication Date: 2012-07-18
HI TREND TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a power line carrier communication system and communication method, which is used to solve the problem of relatively low communication reliability and communication efficiency caused by the fixed transmission rate in the prior art

Method used

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  • Power line carrier communication system and communication method
  • Power line carrier communication system and communication method
  • Power line carrier communication system and communication method

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Experimental program
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Effect test

Embodiment 1

[0037] Aiming at a power line carrier communication system supporting acknowledgment (ACK, ACKnowledgment) / denial (NACK, Negative ACKnowledgment) response frames.

[0038] For transmission parameters including modulation mode, code rate, and repetition code repetition times, the default value setting of the system is set as BPSK modulation (Binary Phase Shift Keying, binary phase shift keying), 1 / 2 The code rate (the code rate of the mother code) and the number of repeated coding times are 1. Assuming that the number of combinations of these transmission parameters supported by the system is N, the combinations of these N sets of parameters are sorted from high to low in transmission rate.

[0039] When receiving a NACK signal or waiting for an ACK / NACK response frame timeout, the transmission rate of one or more levels will be reduced on the basis of the current transmission rate combination; when M (M>=2) ACK signals are received continuously, the Based on the current trans...

Embodiment 2

[0041] For power line carrier communication systems that do not support acknowledgment (ACK) / negation (NACK) response frames.

[0042] In the power line carrier communication system, meter reading is one of the most important applications, and what is read is daily frozen data. When the concentrator sends a copy command and fails to copy once, it will perform a re-copy, that is, send the copy command again.

[0043] In order to improve the probability of successful communication, when a re-copy instruction is received, the transmission rate of one or more levels is reduced on the basis of the current transmission rate combination. If consecutive M (M>=2) times of copying are all successful, that is, in the process of M consecutive copying, no re-copying instruction is received, and the transmission rate of one level is increased on the basis of the current transmission rate.

Embodiment 3

[0045] For transmission parameters including modulation mode, code rate, and repetition times of code repetition, it is assumed that the number of combinations of transmission modes supported by the power line carrier communication system is N. First, the physical layer unit provides a mapping lookup table, and a combination of transmission modes is mapped to a Signal to Interference plus Noise Ratio (SINR) interval, so that combinations of N transmission modes are mapped to obtain N SINR intervals. The mapping rule is that within this SINR interval, the bit error rate (Bit Error Ratio, BER) or frame error rate (Frame Error Rate, FER) of the power line carrier communication system is not higher than the bit error rate BER or frame error rate required by the system Fer.

[0046] During the communication operation of the power line carrier communication system, the physical layer unit performs SINR calculation and feeds back the calculation result to the media access control lay...

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Abstract

The invention provides a power line carrier communication system and communication method. The power line carrier communication system comprises a first communication interface, a second communication interface and a transmission-mode selecting unit, wherein the first communication interface establishes communication connection with a physical layer unit which supports multiple transmission modes; the transmission parameters in the transmission modes comprise modulation modes, channel encoding rate and times for repeated encoding; the second communication interface establishes communication connection with a media access control layer unit; the transmission-mode selecting unit is used for selecting one transmission mode for the physical layer unit according to information obtained in the communication process by the power line carrier communication system and obtained from the media access control layer unit, and configuring transmission rate corresponding to a current communication channel. Compared with the prior art, the power line carrier communication system and communication method disclosed by the invention have the advantages that the channel change condition can be reflected correctly, the transmission rate can be adjusted in a self-adaptive manner, and the communication reliability and the communication efficiency of power line carrier communication are improved.

Description

technical field [0001] The invention relates to the field of power line carrier communication, in particular to a power line carrier communication system and a communication method for selecting different transmission modes. Background technique [0002] Power line carrier communication technology is a communication method that uses power lines as a communication medium to transmit data information. It uses carrier waves to realize the transmission and communication of data, voice, video, etc. Now this technology is widely used in communication, electric power, industrial control and other industries. This communication technology is an advanced technology in today's communication industry. [0003] Power line carrier communication technology generally includes: high-voltage power line carrier communication using a high-voltage transmission line with a voltage level of 35kV and above as a communication medium; medium-voltage power line carrier communication with a medium-vol...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04L1/00
Inventor 邱赐云
Owner HI TREND TECH SHANGHAI
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