CN109039378B - Method for realizing self-adaptive switching of communication frequency bands of G3-PLC network - Google Patents

Method for realizing self-adaptive switching of communication frequency bands of G3-PLC network Download PDF

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CN109039378B
CN109039378B CN201810935117.7A CN201810935117A CN109039378B CN 109039378 B CN109039378 B CN 109039378B CN 201810935117 A CN201810935117 A CN 201810935117A CN 109039378 B CN109039378 B CN 109039378B
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魏华义
尹建丰
陈健龙
葛海磊
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Jiangsu Linyang Energy Co ltd
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Abstract

A method for realizing self-adaptive switching of communication frequency bands of a G3-PLC network includes the steps that a PAN Coordinator module in the G3-PLC network obtains and records environmental noise level, communication signal quality level, network topology series and communication success rate of each communication module in the network, the application values of two communication frequency bands of CENELEC-A and FCC to the power line environment are obtained and are configured to each communication module in the network step by step, switching of a hardware filter circuit and switching and configuration parameters of a software protocol stack are controlled by means of a delay synchronization control algorithm, and self-adaptive switching of the whole G3-PLC network communication frequency band and self-adaptive control of subcarriers are realized. The self-adaptive switching method of the communication frequency band of the G3-PLC network adopts automatic evaluation and automatic switching of the communication frequency band and the sub-carrier mask of the specific power line environment, so that the labor cost is saved, the complexity of the network structure is reduced, and the communication reliability is improved.

Description

Method for realizing self-adaptive switching of communication frequency bands of G3-PLC network
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a method for realizing self-adaptive switching of a communication frequency band of a G3-PLC network.
Background
The G3-PLC is an ofdm (orthogonal Frequency Division multiplexing) power line carrier communication technology widely used in low-voltage power meter reading systems at present, and according to the specification of the G3-PLC standard, the PLC can work in both a CENELEC-a (international communication for electronic Standardization Band a) Frequency Band and a fcc (federal Communications communication) Frequency Band, and the communication Frequency Band needs to be selected according to an actual application scenario. According to the regulation of ITU-T G.9901 appendix B, the 1 st subcarrier frequency and the last 1 st subcarrier frequency of OFDM in CENELEC-A frequency band are 35.9375kHz and 90.625kHz respectively, the subcarrier frequency interval is 1.5625kHz, the 1 st subcarrier frequency and the last 1 st subcarrier frequency of OFDM in FCC frequency band are 154.6875kHz and 487.5kHz respectively, and the subcarrier frequency interval is 4.6875kHz, so that G3-PLC has 36 subcarriers at most in CENELEC-A frequency band and 72 subcarriers at most in FCC frequency band, and the subcarriers can be enabled or disabled in a masking mode according to the practical application environment, thereby realizing the coexistence with other power line carrier communication schemes (such as S-FSK) or shielding the subcarriers with poor communication quality to enhance the reliability of communication.
However, in practical applications, it is necessary to evaluate whether it is suitable for CENELEC-a band or FCC band in the field for a specific power line communication environment, and which sub-carriers need to be enabled and disabled for the communication band. However, since the power line communication environment differs depending on the influence of the wiring path, the number of users, the type of the access appliance, the size of the load, and the like, the work load of field evaluation for the power line communication environment under each low-voltage transformer is enormous, and the influence of the power line environment on communication is also variable.
In addition, due to the limitation of a hardware carrier circuit of a G3-PLC communication module and the limitation of software protocol implementation, two communication frequency bands cannot be automatically switched on site currently, two different modules need to be replaced, and manual configuration is also needed for controlling the subcarrier mask of the communication frequency band.
Disclosure of Invention
The invention aims to solve the problems that the use of a communication frequency band and a subcarrier of a power line environment cannot be automatically evaluated and determined and the communication frequency band and the subcarrier of a communication module in a G3-PLC network cannot be automatically switched, and provides a method for realizing the self-adaptive switching of the communication frequency band and the subcarrier of the G3-PLC network.
The technical scheme of the invention is as follows:
the invention provides a method for realizing self-adaptive switching of a communication frequency band of a G3-PLC network, which comprises the following steps:
s1, connecting a concentrator with a plurality of electric meters to construct a G3-PLC network, wherein the concentrator comprises a network Coordinator module, namely a PAN Coordinator module, and the electric meters comprise network equipment modules, namely PAN Device modules;
s2, after networking is finished, the PAN Coordinator module records the address list of all PAN Device modules in the network, and establishes an evaluation record table aiming at each communication module, namely the PAN Device module, and presets the communication module at CENELEC-A frequency band and FCC frequency bandAmbient noise level threshold N within a segmentthSignal quality threshold SthNetwork routing stage number threshold LthAnd a communication success rate threshold Rth；
S3, aiming at the whole G3-PLC network, the PAN Coordinator module acquires and records the environmental noise level N, the signal quality level S, the network routing level L and the communication success rate R of each communication module, and calculates the average value of the environmental noise level of each module in the current frequency band
Figure BDA0001767620450000031
Signal quality level mean
Figure BDA0001767620450000032
Mean value of network routing stage number
Figure BDA0001767620450000033
And communication success rate mean
Figure BDA0001767620450000034
The average values are respectively compared with the environmental noise level threshold value N in the corresponding frequency band preset in the step S2thSignal quality threshold SthNetwork routing order LthAnd a communication success rate threshold RthThe comparison is carried out in such a way that,
mean value of ambient noise level
Figure BDA0001767620450000035
Greater than an ambient noise level threshold NthMean of signal quality level
Figure BDA0001767620450000036
Less than a signal quality threshold SthMean value of network routing stage number
Figure BDA0001767620450000037
Greater than the network routing stage number threshold LthMean value of success rate of communication
Figure BDA0001767620450000038
Xiaotong (Chinese character of' XiaotongSignal success rate threshold RthWhen any one of the above conditions is satisfied, switching channels;
s4, calculating a frequency band applicable value Q' in two frequency bands before and after switching under the current power line environment:
Q＝(Nth-N)╳2+(S-Sth)╳1+(Lth-L)╳20+(R-Rth)╳100；
Figure BDA0001767620450000039
where N is the current ambient noise level, NthIs the current frequency band environmental noise level threshold, S is the current signal quality, SthIs the current frequency band signal quality threshold, L is the current routing stage number, LthThe routing progression threshold value of the current frequency band network is set, R is the current communication success rate, RthA current frequency band communication success rate threshold value; q is the frequency band applicable value of each communication module in the communication frequency band under the current power line environment, and m represents the total number of the communication modules, namely PAN Device modules;
s5, selecting a frequency channel with a high frequency band applicability Q' as a final applicable frequency band for the switching, configuring the frequency channel to each communication module of the G3-PLC network, controlling a frequency band switching circuit, a software protocol stack and configuration parameters, and completing the self-adaptive switching of the whole G3-PLC network communication frequency band.
Further, in step S1, the environmental noise levels of the communication modules are obtained and recorded, where the environmental noise levels include the environmental noise values of 36 subcarrier frequency points in the CENELEC-a band and 72 subcarrier frequency points in the FCC band, and the average noise value in each band, and the unit of the environmental noise value is dBuV.
Further, in step S1, the acquiring and recording the signal quality level of each communication module specifically includes: through communication of the PAN Coordinator and the PAN Device, the signal-to-noise ratio of each communication module of the whole G3-PLC network is obtained and recorded, the signal quality value is obtained, and then the signal quality level of all subcarrier frequency points and the average signal quality level in a CENELEC-A frequency band and an FCC frequency band are calculated.
Further, calculating a signal quality value LQI by adopting the following formula for the signal-to-noise ratio SNR of each communication module at each subcarrier frequency point;
when SNR is less than or equal to-10 dB, LQI is 0;
when the SNR is larger than or equal to 53.75dB, the LQI is 255;
when SNR is less than or equal to 53.75dB and is less than or equal to-10 dB, the LQI is increased by 0.25dB step according to a linear relation, namely
Figure BDA0001767620450000041
Wherein: the signal quality LQI range is: 0 to 255.
Further, in step S1, the network routing number of each module is obtained and recorded, including the network routing number and routing path from the concentrator PAN Coordinator to each meter PAN Device.
Further, recording the communication success rate of each communication module specifically includes: in the communication process between the PAN Coordinator module and each PAN Device module, if the PAN Coordinator module successfully receives the response of the PAN Device module after sending a communication request to a certain PAN Device module, the communication is considered to be successful, otherwise, the communication is failed.
Further, in step S2, a threshold of the subcarrier mask of the communication module in the corresponding frequency band is preset; in step S5, after the finally applicable frequency band is selected, the subcarrier frequency point whose subcarrier signal quality is greater than the subcarrier mask threshold is selected for configuration, and adaptive control of the subcarrier mask is completed.
Further, within the CENELEC-a frequency band, the ambient noise level threshold NthIs 75dBuV, signal quality threshold SthIs 90, network routing level threshold LthIs 5, the communication success rate threshold is 70%; ambient noise level threshold N in FCC bandthIs 70dBuV, signal quality threshold SthIs 80, network routing level threshold LthIs 6, communication success rate threshold RthIs 70%.
Further, in the CENELEC-a band, the threshold value of the subcarrier signal is 60, and in the FCC band, the threshold value of the subcarrier signal is 55.
The invention has the beneficial effects that:
the invention aims at the specific power line communication environment, determines the applicable communication frequency band and subcarrier frequency point according to the environmental noise, the signal quality, the routing topological stage and the communication success rate of each communication module in the G3-PLC network, and realizes the self-adaptive switching of the communication frequency band and the subcarrier mask by controlling hardware carrier circuits of different communication frequency bands and switching and configuring software protocols, thereby effectively reducing the labor cost, increasing the automation degree of the system, reducing the complexity of the specific power line environment G3-PLC network topological structure and improving the communication reliability of the whole G3-PLC network.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a schematic diagram of a G3-PLC network according to the present invention;
FIG. 2 is a flow chart of the present invention;
fig. 3 is a circuit diagram of a frequency band switching control circuit of a communication module.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
A method for realizing G3-PLC network communication frequency band self-adaptive switching includes recording address lists of all PAN Device modules in the network by PAN Coordinator module according to G3-PLC standard networking flow after G3-PLC networking is finished, establishing evaluation record table for each PAN Device module, obtaining environment noise value (dBuV) of frequency points of subcarriers according to G3-PLC physical layer characteristics and recording it in evaluation record table, obtaining route topology series of the module and recording it by PAN Coordinator module according to address list of PAN Device module, completing route request primitive Q according to G3-PLC standard route, initiating request for environment noise value of PAN module by Coordinator module, obtaining environment noise value of PAN module and recording Device, the communication process is continuously performed for 100 times, in the process, the PAN Coordinator module and the PAN Device module record the received signal strength and the signal-to-noise ratio of a communication signal at each subcarrier frequency point, calculate a signal quality value, then calculate an average value of the signal quality in a CENELEC-a frequency band and an FCC frequency band, and simultaneously statistically calculate and record the communication success rate of the communication process, the statistical recording process is completed for each PAN Device module one by one, data records of the CENELEC-a frequency band and the FCC frequency band are respectively formed, and the data record table is as shown in table 1 as an example:
TABLE 1
Figure BDA0001767620450000061
Figure BDA0001767620450000071
The evaluation of the power line environmental noise value is carried out by measuring the environmental noise in the whole range of G3-PLC communication frequency bands (CENELEC-A frequency band and FCC frequency band) by using the physical layer characteristics of the communication module, and calculating and recording the environmental noise value of each subcarrier frequency point in the two communication frequency bands and the average value in the frequency bands. Since the G3-PLC CENELEC-a band and the FCC band have 36 subcarriers and 72 subcarriers, respectively, the statistical data of the environmental noise in the respective bands is shown in table 2:
TABLE 2
Figure BDA0001767620450000072
Figure BDA0001767620450000081
In the evaluation and calculation of the signal quality, the range of the signal quality LQI is: 0-255, and the values are defined as:
when SNR is less than or equal to-10 dB, LQI is 0;
when the SNR is larger than or equal to 53.75dB, the LQI is 255;
when SNR is less than or equal to 53.75dB and is less than or equal to-10 dB, then the LQI is increased by 0.25dB step according to the linear relation, namely
Figure BDA0001767620450000082
The routing topology is evaluated by using a routing topology acquisition method (RREQ) of G3-PLC standard to acquire and record the number of routing topology stages from a PAN Coordinator module to each PAN Device module, for example, the round-trip routing path of a certain PAN Device module N is: PAN Coordinator module- > PAN Device module 1- > PAN Device module 3- > PAN Device module N- > PAN Device module 3- > PAN Device module 8- > PAN Coordinator module, and the routing topology series of the PAN Device module N is 6.
And evaluating the communication success rate, namely calculating and recording the communication success rate of the PAN Coordinator module and each PAN Device module in the communication process of the PAN Coordinator module and each PAN Device module, and if the PAN Coordinator module successfully receives the response of the PAN Device module after sending a communication request to a certain PAN Device module, considering the communication is successful, otherwise, the communication is failed.
The PAN Coordinator module evaluates environmental noise, signal quality, routing topological progression and communication success rate of a communication module in the G3-PLC network, switches frequency bands according to threshold values in a table 3, and immediately switches the frequency bands and completes evaluation and comparison of the two communication frequency bands to determine selection of an optimal frequency band if one of evaluation parameters reaches the switching threshold value; otherwise, the switching is not required to be immediately carried out, manual switching is required or switching is carried out after the switching timing time is reached, and comparison and selection are carried out after the two frequency band evaluation parameters are obtained.
TABLE 3
Figure BDA0001767620450000091
The evaluation of the two communication bands before and after the handover,
Q＝(Nth-N)╳2+(S-Sth)╳1+(Lth-L)╳20+(R-Rth)╳100.
Figure BDA0001767620450000092
where N is the current noise level, NthIs the noise level threshold of the frequency band, S is the current signal quality, SthFor the frequency band signal quality threshold, L is the current routing stage number, LthFor the frequency band routing progression threshold, R is the current communication success rate, RthFor the frequency band communication success rate threshold, Q is a frequency band applicable value of each communication module in the communication frequency band to which the communication module belongs in the current power line environment, and m represents the total number of the communication modules, i.e., PAN Device modules.
According to the frequency band applicability, the applicability of a CENELEC-A frequency band and an FCC frequency band in the power line communication environment is selected and obtained, and the high-applicability communication frequency band is a communication frequency band more suitable for operating in the power line environment; and meanwhile, determining the sub-carriers to be adopted by the communication frequency band according to the applicable scores of the different sub-carriers of the communication frequency band. Then, the configuration parameters are issued to each communication module of the G3-PLC network, and then hardware circuits are controlled at the same time through a timing method, so that the hardware circuits are switched to carrier communication circuits of corresponding communication frequency bands, and simultaneously, software protocols are switched to corresponding communication frequency band protocol stacks, and the sub-carrier mask configuration of the communication frequency bands is completed. Then, the G3-PLC network uses the updated communication frequency band and sub-carrier for networking and communication.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (9)

1. A method for realizing self-adaptive switching of communication frequency bands of a G3-PLC network is characterized by comprising the following steps: the method comprises the following steps:
s1, connecting a concentrator with a plurality of electric meters to construct a G3-PLC network, wherein the concentrator comprises a network Coordinator module, namely a PAN Coordinator module, and the electric meters comprise network equipment modules, namely PAN Device modules;
s2, after networking is finished, the PAN Coordinator module records the address list of all PAN Device modules in the network, establishes an evaluation record table for each communication module, namely the PAN Device module, and presets the environmental noise level threshold N of the communication module in the CENELEC-A frequency band and the FCC frequency bandthSignal quality threshold SthNetwork routing stage number threshold LthAnd a communication success rate threshold Rth；
S3, aiming at the whole G3-PLC network, the PAN Coordinator module acquires and records the environmental noise level N, the signal quality level S, the network routing level L and the communication success rate R of each communication module, and calculates the average value of the environmental noise level of each module in the current frequency band
Figure FDA0003142035170000011
Signal quality level mean
Figure FDA0003142035170000012
Mean value of network routing stage number
Figure FDA0003142035170000013
And communication success rate mean
Figure FDA0003142035170000014
The above average valueRespectively corresponding to the environmental noise level threshold N in the corresponding frequency band preset in step S2thSignal quality threshold SthNetwork routing order LthAnd a communication success rate threshold RthThe comparison is carried out in such a way that,
mean value of ambient noise level
Figure FDA0003142035170000015
Greater than an ambient noise level threshold NthMean of signal quality level
Figure FDA0003142035170000016
Less than a signal quality threshold SthMean value of network routing stage number
Figure FDA0003142035170000017
Greater than the network routing stage number threshold LthMean value of success rate of communication
Figure FDA0003142035170000018
Less than a communication success rate threshold RthWhen any one of the two is established, switching the frequency bands;
s4, calculating a frequency band applicable value Q' in two frequency bands before and after switching under the power line environment of the kth communication module:
Qk＝(Nth-Nk)╳2+(Sk-Sth)╳1+(Lth-Lk)╳20+(Rk-Rth)╳100；
Figure FDA0003142035170000019
wherein N iskIs the current ambient noise level, N, of the kth communication modulethFor the current frequency band ambient noise level threshold, SkIs the current signal quality, S, of the kth communication modulethFor the signal quality threshold of the current frequency band, LkIs the current routing order, L, of the kth communication modulethFor the current band network routing levelNumber threshold, RkCurrent communication success rate, R, of the kth communication modulethA current frequency band communication success rate threshold value; qkThe applicable value of the frequency band of the kth communication module in the communication frequency band is shown, and m represents the total number of the communication modules, namely PAN Device modules; k represents the number of the communication module;
s5, selecting a frequency channel with a high frequency band applicability Q' as a final applicable frequency band for the switching, configuring the frequency channel to each communication module of the G3-PLC network, controlling a frequency band switching circuit, a software protocol stack and configuration parameters, and completing the self-adaptive switching of the whole G3-PLC network communication frequency band.
2. The method as claimed in claim 1, wherein in step S1, the ambient noise level of each communication module is obtained and recorded, the ambient noise level includes the ambient noise values of 36 subcarriers in CENELEC-a band and 72 subcarriers in FCC band, and the average noise value in each band, and the unit of the ambient noise value is dBuV.
3. The method of claim 1, wherein in step S1, the obtaining and recording the signal quality level of each communication module specifically comprises: through communication of the PAN Coordinator and the PAN Device, the signal-to-noise ratio of each communication module of the whole G3-PLC network is obtained and recorded, the signal quality value is obtained, and then the signal quality level of all subcarrier frequency points and the average signal quality level in a CENELEC-A frequency band and an FCC frequency band are calculated.
4. The method for realizing the self-adaptive switching of the communication frequency band of the G3-PLC network according to claim 3, wherein the signal quality value LQI is calculated for the SNR of each communication module at each subcarrier frequency point by adopting the following formula;
when SNR is less than or equal to-10 dB, LQI is 0;
when the SNR is larger than or equal to 53.75dB, the LQI is 255;
when SNR is less than or equal to 53.75dB and is less than or equal to-10 dB, the LQI is increased by 0.25dB step according to a linear relation, namely
Figure FDA0003142035170000021
Wherein: the signal quality LQI range is: 0 to 255.
5. The method according to claim 1, wherein in step S1, the network routing orders of the modules are obtained and recorded, including the network routing orders and routing paths from the concentrator PAN Coordinator to each meter PAN Device.
6. The method for realizing self-adaptive switching of the communication frequency band of the G3-PLC network according to claim 1, wherein the recording of the communication success rate of each communication module specifically comprises: in the communication process between the PAN Coordinator module and each PAN Device module, if the PAN Coordinator module successfully receives the response of the PAN Device module after sending a communication request to a certain PAN Device module, the communication is considered to be successful, otherwise, the communication is failed.
7. The method of claim 3, wherein in step S2, a threshold value of a sub-carrier mask in a corresponding frequency band is preset for the communication module; in step S5, after the finally applicable frequency band is selected, the subcarrier frequency point whose subcarrier signal quality is greater than the subcarrier mask threshold is selected for configuration, and adaptive control of the subcarrier mask is completed.
8. The method as claimed in claim 1, wherein the environmental noise level threshold N is set within a CENELEC-a bandthIs 75dBuV, signal quality threshold SthIs 90, network routing level threshold LthIs 5, the communication success rate threshold is 70%; ambient noise level threshold N in FCC bandthIs 70dBuV, XinNumber quality threshold SthIs 80, network routing level threshold LthIs 6, communication success rate threshold RthIs 70%.
9. The method of claim 7 wherein the threshold value of the sub-carrier signal is 60 in CENELEC-A band and 55 in FCC band.
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