CN111600764A - MoCA network fault detection method - Google Patents
MoCA network fault detection method Download PDFInfo
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- CN111600764A CN111600764A CN202010499580.9A CN202010499580A CN111600764A CN 111600764 A CN111600764 A CN 111600764A CN 202010499580 A CN202010499580 A CN 202010499580A CN 111600764 A CN111600764 A CN 111600764A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2801—Broadband local area networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
Abstract
The invention discloses a fault detection method for a MoCA network, which comprises the steps of obtaining uplink and downlink signal data generated after the front end of the MoCA network is modulated, obtaining modulation diagram data of the modulation diagram data, carrying out bit loading on the modulation diagram data, enabling each modulation diagram data to correspond to a frequency point, enabling the modulation mode of each frequency point to correspond to a bit value, enabling different modulation modes to correspond to different bit values, and enabling the higher the modulation mode to be, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is; if the current modulation diagram data is set in one modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; otherwise, if the modulation mode of a certain modulation map data in the current modulation map data is smaller than the set modulation mode, the MoCA network has a fault. Through the corresponding MoCA network frequency points, the faults of the corresponding MoCA network frequency points in the positions can be detected, so that the faults can be conveniently and accurately maintained and checked by later-period maintenance personnel.
Description
Technical Field
The invention relates to the technical field of network fault detection of a MoCA system, in particular to a method for detecting a MoCA network fault.
Background
MOCA, i.e., Multimedia over Coax Alliance, is a Multimedia over Coax Alliance, is an industry standard, and provides broadband access and home network product schemes based on coaxial cables. MOCA equipment is used for building radio and television IP networks and is widely applied.
With the wide application of the ethernet access technology based on the cable television coaxial cable, the usage amount of corresponding equipment is also increasing, but the matched fault detection method is quite rare, especially for network opening and network fault problem troubleshooting, and the existing network performance test method based on the network cable cannot be applied to network fault detection of a MoCA system in a coaxial network due to different protocols.
Disclosure of Invention
The invention aims to provide a convenient, simple and effective MoCA network fault detection method.
The invention relates to a fault detection method for a MoCA network, which comprises the following steps:
acquiring uplink and downlink signal data generated after the front end of the MoCA network is modulated, and acquiring modulation diagram data of the uplink and downlink signal data;
carrying out bit loading on the modulation diagram data to enable each modulation diagram data to correspond to one frequency point, enabling the modulation mode of each frequency point to correspond to one bit value, enabling different modulation modes to correspond to different bit values, and enabling the higher the modulation mode is, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is;
if the current modulation diagram data is set in one modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; otherwise, if the modulation mode of a certain modulation map data in the current modulation map data is smaller than the set modulation mode, the MoCA network has a fault.
According to the fault detection method for the MoCA network, the MoCA network terminal acquires the data of the uplink and downlink signals of the front-end MoCA network in a signal modulation mode, acquires the modulation diagram data of the uplink and downlink signals, detects whether the signals modulated by the front-end signals are distorted in the transmission process, and can effectively find out the source of fault interference generated by the MoCA network line. Each modulation diagram data corresponds to one frequency point, the modulation mode of each frequency point corresponds to one bit value, different modulation modes correspond to different bit values, and the higher the modulation mode is, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is, if the current modulation diagram data is set to be in one modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault, otherwise, the modulation mode of certain modulation diagram data in the current modulation diagram data is lower than the set modulation mode, the MoCA network has fault, and the fault of the position of the corresponding frequency point of the MoCA network can be detected through the corresponding frequency point of the MoCA network, so that the later-period maintenance personnel can conveniently accurately maintain and troubleshoot the fault of the MoCA network.
Drawings
FIG. 1 is a schematic flow chart of a fault detection method for a MoCA network according to the present invention;
FIG. 2 is a diagram illustrating data of uplink and downlink signals with respect to SNR but with signal interference according to an embodiment of the present invention;
fig. 3 is a schematic diagram of data of uplink and downlink signals with low snr but signal interference according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for detecting a MoCA network fault according to the present invention includes the following steps:
acquiring uplink and downlink signal data generated after the front end of the MoCA network is modulated, and acquiring modulation diagram data of the uplink and downlink signal data;
carrying out bit loading on the modulation diagram data to enable each modulation diagram data to correspond to one frequency point, enabling the modulation mode of each frequency point to correspond to one bit value, enabling different modulation modes to correspond to different bit values, and enabling the higher the modulation mode is, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is;
if the current modulation diagram data is set in one modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; otherwise, if the modulation mode of a certain modulation map data in the current modulation map data is smaller than the set modulation mode, the MoCA network has a fault.
The method comprises the steps of obtaining data of uplink and downlink signals of a front-end MoCA network at a MoCA network terminal in a signal modulation mode, obtaining modulation diagram data of the data, detecting whether the signals modulated by the front-end signals are distorted in the transmission process, and effectively checking a source of fault interference generated by a MoCA network line. Each modulation diagram data corresponds to one frequency point, the modulation mode of each frequency point corresponds to one bit value, different modulation modes correspond to different bit values, and the higher the modulation mode is, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is, if the current modulation diagram data is set in one modulation mode, and the modulation mode of a certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; on the contrary, if the modulation mode of a certain modulation diagram data in the current modulation diagram data is lower than the set modulation mode, the fault exists in the MoCA network, and the fault at the position of the corresponding frequency point of the MoCA network can be detected through the corresponding frequency point of the MoCA network, so that the later-period maintenance personnel can conveniently and accurately check the fault of the MoCA network.
The bit value is 1 to 8, each digit in 1-8 respectively represents a modulation mode, and the digits sequentially correspond to 256QAM, 128 QAM, 64QAM, 32QAM, 16QAM, 8QAM, QPSK and BPSK modulation modes from large to small;
if the current modulation diagram data is set to be in a 256QAM modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the modulation mode set to be 256QAM, the MoCA network has no fault; on the contrary, if the modulation mode of a certain modulation diagram data in the current modulation diagram data is smaller than the set 256QAM modulation mode, the fault exists in the MoCA network, and the fault of the position of the corresponding MoCA network frequency point can be detected according to the MoCA network frequency point corresponding to the modulation diagram data, so that the later-period maintenance personnel can conveniently and accurately check the fault of the MoCA network.
The modulation map data includes 256 subcarrier data; carrying out bit loading on 256 subcarrier data to enable each subcarrier data to correspond to a frequency point, enabling the modulation mode of each frequency point to correspond to one number from 1 to 8, enabling different modulation modes to correspond to different numbers from 1 to 8, and enabling the higher the modulation mode is, the higher the corresponding number from 1 to 8 is; the lower the modulation mode, the lower the corresponding number 1 to 8;
if the current 256 subcarrier data are set in the 256QAM modulation mode, and the modulation mode of one subcarrier data in the current 256 subcarrier data is equal to the set 256QAM modulation mode, the MoCA network has no fault; on the contrary, if the modulation mode of a certain subcarrier data in the current 256 subcarrier data is smaller than that of 256QAM, the fault exists in the MoCA network, and the fault of the position of the corresponding MoCA network frequency point can be detected according to the MoCA network frequency point corresponding to the modulation diagram data, so that the later-period maintenance personnel can conveniently and accurately check the fault of the MoCA network.
And the modulation modes of the frequency points are automatically matched according to the signal-to-noise ratios of subcarriers of an adaptive constellation diagram multicarrier mode (OFDM), wherein the larger the signal-to-noise ratio is, the higher the matched modulation mode is, the smaller the signal-to-noise ratio is, and the lower the matched modulation mode is. As shown in fig. 2, when the signal noise of the subcarrier data in the uplink and downlink signals sent by the front end of the MoCA network is high, the modulation mode of the subcarrier data adopts a higher 256QAM modulation mode, and the modulation mode of a certain subcarrier data is equal to the set 256QAM modulation mode, so that the MoCA network has no fault; on the contrary, if the modulation mode of a certain subcarrier data is smaller than that of 256QAM, the MoCA network has a fault. As shown in fig. 3, when the signal noise of the data of the uplink and downlink signals transmitted by the front end of the MoCA network is low, the modulation mode of the data adopts a higher 8QAM modulation mode, and the modulation mode of a certain subcarrier data is equal to the set 8QAM modulation mode, so that the MoCA network has no fault; on the contrary, if the modulation mode of a certain subcarrier data is smaller than that of 8QAM, the MoCA network has a fault. The modulation mode is automatically switched to a lower modulation mode according to the magnitude of the signal-to-noise ratio, so that the detection anti-interference capability is enhanced.
The bandwidth of each OFDM subcarrier is about 192KHz (50 MHz/256=192 KHz), the selection of the modulation scheme for each subcarrier is determined by the signal-to-noise ratio of the OFDM subcarrier, and the modulation rate is adjusted by selecting the OFDM subcarrier and varying the bit loading on each subcarrier. The symbols of the QAM constellation may vary from 1 to 8 bits, i.e. from BPSK to 256QAM, per OFDM subcarrier.
As shown in fig. 2 and 3, each vertical line represents a subcarrier signal, and the ordinate represents the modulation modes of BPSK, QPSK, 8QAM, 16QAM, 32QAM, 64QAM, 128 QAM, and 256QAM corresponding to the subcarriers represented by bit loading 1 to 8, so that the modulation modes of each subcarrier can be seen from the figure, and if the modulation mode is set to be one of the modulation modes, and the modulation mode of a certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; otherwise, if the modulation mode of a certain modulation map data in the current modulation map data is smaller than the set modulation mode, the MoCA network has a fault. Through the corresponding MoCA network frequency points, the faults of the corresponding MoCA network frequency points in the positions can be detected, so that the later-period maintenance personnel can conveniently and accurately maintain and troubleshoot the MoCA network faults.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (4)
1. A fault detection method for a MoCA network is characterized by comprising the following steps:
acquiring uplink and downlink signal data generated after the front end of the MoCA network is modulated, and acquiring modulation diagram data of the uplink and downlink signal data;
carrying out bit loading on the modulation diagram data to enable each modulation diagram data to correspond to one frequency point, enabling the modulation mode of each frequency point to correspond to one bit value, enabling different modulation modes to correspond to different bit values, and enabling the higher the modulation mode is, the higher the corresponding bit value is; the lower the modulation mode is, the lower the corresponding bit value is;
if the current modulation diagram data is set in one modulation mode, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault; otherwise, if the modulation mode of a certain modulation map data in the current modulation map data is smaller than the set modulation mode, the MoCA network has a fault.
2. The MoCA network fault detection method according to claim 1, wherein the bit values are 1 to 8, each digit in 1-8 represents a modulation mode, and the digits sequentially correspond to 256QAM, 128 QAM, 64QAM, 32QAM, 16QAM, 8QAM, QPSK and BPSK modulation modes from large to small;
if the current modulation diagram data is set to be in one modulation mode of 256QAM, 128 QAM, 64QAM, 32QAM, 16QAM, 8QAM, QPSK and BPSK, and the modulation mode of certain modulation diagram data in the current modulation diagram data is equal to the set modulation mode, the MoCA network has no fault, otherwise, the modulation mode of certain modulation diagram data in the current modulation diagram data is smaller than the set modulation mode, and the MoCA network has fault.
3. The MoCA network fault detection method of claim 2, wherein the modulation map data comprises 256 sub-carrier data;
carrying out bit loading on 256 subcarrier data to enable each subcarrier data to correspond to a frequency point, enabling the modulation mode of each frequency point to correspond to one number from 1 to 8, enabling different modulation modes to correspond to different numbers from 1 to 8, and enabling the higher the modulation mode is, the higher the corresponding number from 1 to 8 is; the lower the modulation mode, the lower the corresponding number 1 to 8;
if the current 256 subcarrier data is set in one modulation mode of 256QAM, 128 QAM, 64QAM, 32QAM, 16QAM, 8QAM, QPSK and BPSK, and the modulation mode of a certain subcarrier data in the current 256 subcarrier data is equal to the set modulation mode, the MoCA network has no fault; on the contrary, if the modulation mode of a certain subcarrier data in the current 256 subcarrier data is smaller than the set modulation mode, the MoCA network fails.
4. The MoCA network fault detection method according to any one of claims 1-3, wherein the modulation modes of the frequency points are automatically matched according to the signal-to-noise ratios of subcarriers in a self-adaptive constellation diagram multicarrier mode (OFDM), and the higher the signal-to-noise ratio is, the higher the matched modulation mode is, the smaller the signal-to-noise ratio is, and the lower the matched modulation mode is.
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Patent Citations (5)
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| US20080212591A1 (en) * | 2007-02-14 | 2008-09-04 | Entropic Communications Inc. | Parameterized quality of service in a network |
| CN105245308A (en) * | 2014-06-18 | 2016-01-13 | 国家广播电影电视总局广播科学研究院 | Adaptive modulation and coding method |
| CN107171772A (en) * | 2016-03-07 | 2017-09-15 | 魏峥 | A kind of control channel production method of wireless self-organization network data burst |
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