CN117527146A - Communication modulation mode self-adaptive adjustment method based on G3-PLC network - Google Patents
Communication modulation mode self-adaptive adjustment method based on G3-PLC network Download PDFInfo
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- CN117527146A CN117527146A CN202311488705.8A CN202311488705A CN117527146A CN 117527146 A CN117527146 A CN 117527146A CN 202311488705 A CN202311488705 A CN 202311488705A CN 117527146 A CN117527146 A CN 117527146A
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- 238000004891 communication Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000012935 Averaging Methods 0.000 claims abstract description 5
- 108700002783 roundabout Proteins 0.000 claims description 7
- 230000001427 coherent effect Effects 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention provides a communication modulation mode self-adaptive adjustment method based on a G3-PLC network, which comprises the following steps: receiving a data frame of a transmitting end, and acquiring communication parameters of a receiving link; analyzing the data frame to obtain communication parameters of a transmission link and a communication modulation mode suggested by a transmitting end; based on the communication parameters of the sending link and the receiving link, comparing the communication parameters with the communication parameter threshold values, and acquiring a communication modulation mode of the receiving end at the moment; comparing the communication modulation mode with a communication modulation mode suggested by a transmitting end; if the communication modulation modes are the same, the communication modulation modes are directly adopted, and if the communication modulation modes are different, a method of averaging and rounding up is adopted. The invention automatically switches the applicable modulation mode through the evaluation of the transmitting power, the communication signal strength, the signal-to-noise ratio, the transceiving data length, the est_mod and the retransmission times when the communication fails of the terminal equipment on the channel, and can ensure the reliability of the transmission at the same time of higher transmission rate.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a communication modulation mode self-adaptive adjustment method based on a G3-PLC network.
Background
The G3-PLC power line carrier communication technology adopts a Narrow-band power line carrier communication standard (Narrow-Band Power Line Communications), and adopts OFDM (Orthogonal Frequency Division Multiplexing) channel coding technology to realize parallel transmission of high-speed serial data, thereby providing a reliable data link for element communication of a smart grid. The OFDM signal is generated by performing Inverse Fast Fourier Transform (IFFT) on complex-valued signal points generated by differential code phase modulation allocated to individual subcarriers, each subcarrier generating a different OFDM signal in a different modulation scheme, thereby generating a different communication rate.
The modulation modes are different according to different modulation schemes, the modulation modes under the coherent (coherent) modulation scheme are BPSK, QPSK, 8PSK and 16-QAM, the modulation modes under the differential (differential) modulation scheme are DBPSK, DQPSK, D PSK, compared with the coherent modulation, se:Sub>A tracking circuit for detecting each subcarrier phase is not needed by se:Sub>A receiving end under the differential modulation, so that the design is simpler, the datse:Sub>A rate of OFDM signals can be up to 33.4kbps under the CENELEC-A communication frequency band by adopting the DBPSK and DQPSK debugging modes, and the terminal equipment needs to select se:Sub>A proper modulation mode when transmitting datse:Sub>A so as to ensure the reliability of transmission at the same time of higher transmission rate.
When the actual power line communication is applied, the transmission rate and the communication quality of the communication equipment on the link are affected by a plurality of factors, and the modulation mode is adjusted by the transmitting power of the terminal equipment or the recommended modulation mode in the primitive RREQ is requested by the receiving end, so that the modulation mode is only selected singly and passively, and the requirement of high transmission reliability cannot be met.
Disclosure of Invention
The invention aims to solve the problem of poor transmission reliability when a single modulation mode is passively selected, and provides a communication modulation mode self-adaptive adjustment method based on a G3-PLC network.
The technical scheme of the invention is as follows:
the method for adaptively adjusting the communication modulation mode based on the G3-PLC network comprises the steps that terminal equipment is provided with G3-PLC modules, communication is carried out among the terminal equipment, and the terminal equipment serving as a receiving end adopts the communication modulation mode for adaptively adjusting and updating the communication modulation mode; the method comprises the following steps:
receiving a data frame of a transmitting end, and acquiring communication parameters of a receiving link;
analyzing the data frame to obtain communication parameters of a transmission link and a communication modulation mode suggested by a transmitting end;
based on the communication parameters of the sending link and the receiving link, comparing the communication parameters with the communication parameter threshold values, and acquiring a communication modulation mode of the receiving end at the moment;
comparing the communication modulation mode with a communication modulation mode suggested by a transmitting end; if the communication modulation modes are the same, adopting a communication modulation mode suggested by the transmitting end, and if the communication modulation modes are different, adopting a method of averaging and rounding upwards as the communication modulation mode at the moment;
at this time, the receiving end performs data transmission in the updated communication modulation mode as the transmitting end.
Further, the transmission link communication parameters include signal strength RSSI when transmitting data S Signal to noise ratio SNR S Transmitting power TxPower; the communication parameters of the receiving link include the signal strength RSSI when receiving data R Signal to noise ratio SNR R 。
Further, based on comparing the communication parameters of the transmitting link and the receiving link with the communication parameter threshold, the obtaining the communication modulation mode of the receiving end specifically includes:
arranging communication modulation modes from high to low based on communication rate;
threshold dividing the Length of communication data frame, and respectively identifying three judging conditions, namely signal strength RSSI S RSSI of signal strength R Whether the signal strength is larger than a set signal strength threshold value; signal to noise ratio SNR S Signal to noise ratio SNR R Whether the signal-to-noise ratio is larger than a set signal-to-noise ratio threshold; and whether the transmission power TxPOwer is larger than the set transmission power;
in the first data frame length threshold interval, if all three judging conditions are met, the communication modulation mode is a first modulation mode; if two of the judging conditions are met, the communication modulation mode is a second modulation mode; if one of the judging conditions is met, the communication modulation mode is a third modulation mode; if all three judging conditions are not met, the communication modulation mode is a fourth modulation mode;
in the second data frame length threshold interval, the one-level modulation mode is correspondingly lowered in the same judgment case as in the first data frame length threshold interval, and so on.
Further, in the communication modulation mode;
the coherent modulation mode is as follows in order from high to low: the first modulation mode 16-QAM, the second modulation mode 8PSK, the third modulation mode QPSK and the fourth modulation mode BPSK, and the fifth modulation mode and the later are all ROBOs;
the differential modulation mode is as follows in sequence from high to low: the first modulation mode D8PSK, the second modulation mode DQPSK and the third modulation mode DBPSK, the fourth modulation mode and thereafter ROBO.
Further, the Length of the communication data frame is subjected to threshold division, and the Length range of the data frame is sequentially narrowed.
Further, the receiving end is based on the Length of the data frame s 、Length R Determine whether it belongs to a first data frame length threshold interval (0, length th1 ]If not, it is further determined whether the second data frame Length threshold interval (Length th1 ，Length th2 ]If not, further judging whether the third data frame Length threshold interval (Length th2 ，Length th3 ]And so on until the corresponding data frame length threshold range is selected.
Further, a method of averaging and rounding up is specifically as the communication modulation mode at this time: if a modulation mode in the middle position exists between the communication modulation mode of the receiving end and the communication modulation mode suggested by the sending end, the modulation mode is directly adopted; if the modulation mode with high communication rate is not selected.
Further, when a communication failure occurs on the link, the retransmission is performed according to the preset number of data retransmissions in the corresponding communication modulation mode, and the communication modulation mode is lowered by one level for each retransmission on the channel until the communication modulation mode is lowered to the ROBO modulation mode.
The invention has the beneficial effects that:
the invention comprehensively considers the influencing factors of the terminal equipment on the G3-PLC communication link, including the transmitting power, the communication signal strength, the signal-to-noise ratio, the data length of receiving and transmitting, the suggested modulation mode of the receiving end and the data retransmission times when the communication fails, realizes the self-adaptive switching of the modulation mode of transmitting data of the terminal equipment, provides reference for the modulation mode when receiving the data, ensures the reliability of transmission and can transmit the data at the maximum transmission rate.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 is a schematic diagram of a G3-PLC network structure according to the present invention;
fig. 2 is a flow chart of the method of the present invention.
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.
As shown in fig. 1, the present invention provides a method for adaptively adjusting a communication modulation mode based on a G3-PLC network, that is, a terminal device with a G3-PLC module, after evaluating a communication environment for receiving and transmitting a data frame, adaptively adjusting and switching a modulation mode of subsequent transmission data, and providing a reference for the modulation mode when receiving data.
As shown in fig. 2, the terminal device requests to acquire the signal strength RSSI on its transmit data link S Signal to noise ratio SNR S Recording the corresponding parameters replied in the data domain of the data frame of the receiving end by the transmitting power TxPower, and analyzing the signal strength RSSI when receiving the data from the replied data frame R 、SNR R Receiving side adviceAnd compares the parameter value with preset communication thresholds.
The method comprises the steps of presetting a transmission power threshold TxPower of a communication module on terminal equipment th Signal strength threshold RSSI th Signal-to-noise ratio threshold SNR th And different data Length threshold Length th1 、Length th2 、Length th3 … (wherein, length) th1 <Length th2 <Length th3 <…)。
And comparing the actual parameter value with each threshold value, and giving a pre-sending modulation mode tx_mod of the sending data and a modulation mode rx_mod of the sending data of the recommended receiving end according to the corresponding comparison result of each threshold value as shown in table 1.
TABLE 1
Wherein, 1 represents that the condition is satisfied and 0 represents that the condition is not satisfied.
The receiving terminal equipment compares the received modulation mode est_mod suggested by the sending terminal with the pre-sending modulation mode tx_mod, if the received modulation mode est_mod is the same, the suggested modulation mode est_mod is used as the modulation mode of final sending and receiving data, and if the received modulation mode est_mod is different, a method of average value and ascending rounding is used as the modulation mode of final sending and receiving data.
When the terminal equipment encounters the condition that the communication of the data sent on the link fails, the terminal equipment can select a mode of retransmitting the data frame to try to send the data to the channel again, and the retransmission times depend on the corresponding maximum retransmission times PIB parameter value MaxFrameReceries. As shown in table 2, taking maxframe retries=3 as an example, the modulation mode is reduced by one step until the ROBO modulation mode is reduced for each time the terminal device retransmits data on the communication channel, so as to realize adaptive adjustment of the modulation mode when the communication fails to retransmit the data.
TABLE 2
In this embodiment, by evaluating the transmission power, the communication signal strength, the signal-to-noise ratio, the transceiving data length, the est_mod and the retransmission times when the communication fails on the channel of the terminal device, the applicable modulation mode is automatically switched, so that the reliability of the transmission can be ensured while the transmission rate is higher.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described.
Claims (8)
1. A communication modulation mode self-adaptive adjustment method based on a G3-PLC network is characterized in that terminal devices are provided with G3-PLC modules, communication is carried out among the terminal devices, and the terminal device serving as a receiving end adopts the communication modulation mode self-adaptive adjustment to update the communication modulation mode; the method comprises the following steps:
receiving a data frame of a transmitting end, and acquiring communication parameters of a receiving link;
analyzing the data frame to obtain communication parameters of a transmission link and a communication modulation mode suggested by a transmitting end;
based on the communication parameters of the sending link and the receiving link, comparing the communication parameters with the communication parameter threshold values, and acquiring a communication modulation mode of the receiving end at the moment;
comparing the communication modulation mode with a communication modulation mode suggested by a transmitting end; if the communication modulation modes are the same, adopting a communication modulation mode suggested by the transmitting end, and if the communication modulation modes are different, adopting a method of averaging and rounding upwards as the communication modulation mode at the moment;
at this time, the receiving end performs data transmission in the updated communication modulation mode as the transmitting end.
2. The method for adaptive adjustment of communication modulation mode based on G3-PLC network according to claim 1, wherein the transmission link communication parameters include signal strength RSSI when transmitting data S Signal to noise ratio SNR S Transmitting power TxPower; the communication parameters of the receiving link include the signal strength RSSI when receiving data R Signal to noise ratio SNR R 。
3. The method for adaptively adjusting a communication modulation mode based on a G3-PLC network according to claim 2, wherein the obtaining the communication modulation mode of the receiving end at this time based on comparing the transmission link communication parameter, the receiving link communication parameter and the communication parameter threshold value specifically includes:
arranging communication modulation modes from high to low based on communication rate;
threshold dividing the Length of communication data frame, and respectively identifying three judging conditions, namely signal strength RSSI S RSSI of signal strength R Whether the signal strength is larger than a set signal strength threshold value; signal to noise ratio SNR S Signal to noise ratio SNR R Whether the signal-to-noise ratio is larger than a set signal-to-noise ratio threshold; and whether the transmission power TxPOwer is larger than the set transmission power;
in the first data frame length threshold interval, if all three judging conditions are met, the communication modulation mode is a first modulation mode; if two of the judging conditions are met, the communication modulation mode is a second modulation mode; if one of the judging conditions is met, the communication modulation mode is a third modulation mode; if all three judging conditions are not met, the communication modulation mode is a fourth modulation mode;
in the second data frame length threshold interval, the one-level modulation mode is correspondingly lowered in the same judgment case as in the first data frame length threshold interval, and so on.
4. A method for adaptive adjustment of communication modulation mode based on G3-PLC network according to claim 3, wherein in the communication modulation mode;
the coherent modulation mode is as follows in order from high to low: the first modulation mode 16-QAM, the second modulation mode 8PSK, the third modulation mode QPSK and the fourth modulation mode BPSK, and the fifth modulation mode and the later are all ROBOs;
the differential modulation mode is as follows in sequence from high to low: the first modulation mode D8PSK, the second modulation mode DQPSK and the third modulation mode DBPSK, the fourth modulation mode and thereafter ROBO.
5. The method for adaptively adjusting a communication modulation mode based on a G3-PLC network according to claim 3, wherein the Length of the communication data frame is thresholded, and the Length range of the data frame is sequentially narrowed.
6. The method for adaptively adjusting communication modulation mode based on G3-PLC network according to claim 3, wherein the receiving terminal is based on a data frame Length s 、Length R Determine whether it belongs to a first data frame length threshold interval (0, length th1 ]If not, it is further determined whether the second data frame Length threshold interval (Length th1 ，Length th2 ]If not, further judging whether the third data frame Length threshold interval (Length th2 ，Length th3 ]And so on until the corresponding data frame length threshold range is selected.
7. The method for adaptively adjusting a communication modulation mode based on a G3-PLC network according to claim 1, wherein the method for averaging and rounding up is specifically as the communication modulation mode at this time: if a modulation mode in the middle position exists between the communication modulation mode of the receiving end and the communication modulation mode suggested by the sending end, the modulation mode is directly adopted; if the modulation mode with high communication rate is not selected.
8. The method for adaptively adjusting a communication modulation mode based on a G3-PLC network according to claim 1, wherein when a communication failure occurs on a link, retransmission is performed according to a preset number of data retransmissions in a corresponding communication modulation mode, and the communication modulation mode is lowered by one step for each retransmission on a channel until the communication modulation mode is lowered to a ROBO modulation mode.
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