CN111277654B - Electrical terminal device and working method thereof - Google Patents
Electrical terminal device and working method thereof Download PDFInfo
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- CN111277654B CN111277654B CN202010068884.XA CN202010068884A CN111277654B CN 111277654 B CN111277654 B CN 111277654B CN 202010068884 A CN202010068884 A CN 202010068884A CN 111277654 B CN111277654 B CN 111277654B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
Abstract
The radio frequency signal output by the photoelectric detector is amplified by the first radio frequency amplifier and the second radio frequency amplifier and then fed back to the Mach-Zehnder electro-optic intensity modulator to finish the generation of the frequency-tunable microwave signal; the electric signal output by the photoelectric detector is transmitted to the PLC, and the PLC transmits the electric signal to a cloud server in the 3G network for display through the 3G module. The hysteresis variation of the 3G network at this time is searched through totalizing 3G network hysteresis during the preset interval. The defect that the 3G network is usually consumed for a longer time length and is very unfavorable for the timeliness of the transmission of the electric signal output by the photoelectric detector in the prior art is effectively avoided by combining other structures or methods.
Description
Technical Field
The invention relates to the technical field of electric terminal equipment, in particular to electric terminal equipment and a working method thereof.
Background
In the process of implementing rf frequency tuning by a microwave photon method, an electrical terminal device is often used, and the electrical terminal device includes a first rf amplifier, a rf power divider, a second rf amplifier, and a low noise amplifier that are electrically connected in sequence. The low noise amplifier is connected with a radio frequency input port of a Mach-Zehnder electro-optic intensity modulator of the optical terminal equipment, and an output end of a photoelectric detector of the optical terminal equipment is connected with an input end of the first radio frequency amplifier.
In this way, the photodetector generates a radio frequency signal; and outputting the radio frequency signal, amplifying the radio frequency signal by the first radio frequency amplifier and the second radio frequency amplifier, and feeding back the amplified radio frequency signal to the Mach-Zehnder electro-optic intensity modulator to complete the radio frequency tuning.
Along with the development of the internet of things technology, the remote monitoring of the electric signal output by the photoelectric detector is more and more mature, specifically, the output end of the photoelectric detector is connected with the input end of the PLC programmable controller, the PLC programmable controller is connected with a cloud server in a 3G network through a 3G module, the cloud server can be a computer, thus, the electric signal output by the photoelectric detector can be transmitted to the PLC programmable controller, and the PLC programmable controller transmits the electric signal to the cloud server in the 3G network through the 3G module for display, so that the purpose of remote monitoring is achieved.
However, because the network speed of the 3G network is always fluctuating, if the amount of the electrical signal output by the transmitted photodetector exceeds the network speed at this time, the 3G network is blocked, the electrical signal output by the photodetector is not smoothly transmitted, the performance of the electrical signal output by the photodetector is weakened, and the performance of another task applied to the 3G network is also unfavorable, and if the amount of the electrical signal output by the transmitted photodetector is smaller than the network speed at this time, the 3G network cannot be well applied, and the performance of the electrical signal output by the photodetector cannot be optimally realized.
To overcome such fluctuation state of 3G net, the PLC can detect the 3G net at this moment, timely identify the blocking condition of the 3G net at this moment by virtue of the 3G net condition, and allocate the net speed for transmitting the electric signal, so that the electric signal output by the transmitted photoelectric detector can be changed by virtue of the net speed of the 3G net, thereby not only overcoming the blocking, but also being suitable for applying the net speed.
However, in the traditional 3G network detection mode, whether the 3G network is blocked is determined by checking whether the 3G network is lost or not, or the 3G network is used as a mark for blocking the 3G network by checking whether the 3G network is lost or not; at present, during the transmission of the electric signal output by the photoelectric detector, the network speed for transmitting the electric signal is continuously increased, if the situation that the 3G network loses the electric signal occurs, the network speed for transmitting the electric signal is weakened, the 3G network detection mode usually executes deployment after the blockage to hopefully overcome the danger of blockage, namely, the 3G network is damaged at first, and maintenance is executed after the damage is detected; the network speed for transmitting the electric signal cannot be reduced in advance at present to overcome the damage, and the 3G network with low network speed is faced with the disadvantage that the damage can be effectively generated and reduced, and the disadvantage that the element is similar is allowable; however, in the case of low network speed, before the 3G network loses the electrical signal, the 3G network is in a blocking condition with small delay, the delay usually reaches 25S, and the recovery of the delay usually consumes longer time, which is very unfavorable for the timeliness of the electrical signal transmission output by the photoelectric detector.
Disclosure of Invention
In order to solve the problems, the invention provides an electric terminal device and a working method thereof, which effectively avoid the defects that the 3G network is usually consumed for a longer time and the timeliness of electric signal transmission output by a photoelectric detector is very unfavorable in the prior art.
In order to overcome the defects in the prior art, the invention provides an electric terminal device and a solution of a working method thereof, which concretely comprises the following steps:
a method of operation of an electrical end device, comprising:
the radio frequency signal output by the photoelectric detector 9 is amplified by the first radio frequency amplifier 10 and the second radio frequency amplifier 12 and then fed back to be input into the Mach-Zehnder electro-optic intensity modulator 3, so that the generation of the frequency-tunable microwave signal is completed;
the electric signal output by the photoelectric detector is transmitted to the PLC, and the PLC transmits the electric signal to a cloud server in the 3G network for display through the 3G module.
The method for the PLC to transmit the electric signal to the cloud server in the 3G network through the 3G module comprises the following sequentially executed processes:
t-1, searching for hysteresis variation of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
the 3G network delay is the time length between transmitting the information of the electric signal output by a photoelectric detector to a cloud server in the 3G network and receiving the response information of the cloud server in the 3G network; the 3G network hysteresis change here is a 3G network hysteresis representing a certain time point, and the 3G network hysteresis change condition at a previous time point, that is, the 3G network hysteresis change can be set into a type of screening operation, and the PLC programmable controller for transmitting the electric signal can detect the 3G network hysteresis change at this time through the change trend of the 3G network hysteresis in the total period of a preset interval period.
In the case of 3G network hysteresis for a pair of successive time points in total, the hysteresis variation of the 3G network at this time can be deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is a 3G network hysteresis variation at the first time point, m (l) is a 3G network hysteresis at the first time point, s is a preset importance coefficient at this time point, and s is greater than zero and less than one.
T-2, searching the situation of the 3G network blocking condition by virtue of the hysteresis change of the 3G network at the moment, and recognizing that the 3G network is not blocked at the moment by virtue of the situation of the 3G network blocking condition;
comparing and searching the hysteresis variation of the 3G network at the moment with the hysteresis variation of the 3G network at the previous moment, and if the recently calculated hysteresis variation of the network at the moment is higher than the previously summed hysteresis variation, identifying that the 3G network is blocked; or whether the hysteresis variation of the 3G network meets the preset critical number or not can be checked, if so, the 3G network is blocked, so that the hysteresis variation of the 3G network is suddenly increased, and the 3G network is considered to be blocked.
Can be identified by equation (2):
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
l, m and t may be positive integers.
In the formula (2), the value obtained by subtracting l and m is smaller than 26, that is, the value obtained by subtracting l and m can be one, that is, m is the previous time point of l;
t is not constrained but depends on the situation.
When the determination formula (2) is satisfied, that is, when the 3G network hysteresis fluctuation at the moment is higher than the 3G network hysteresis fluctuation value at the previous moment m by more than the critical number T for blocking, determining that the 3G network is blocked at the moment, and executing T-3; otherwise, when the identification formula (2) is not satisfied, it is identified that the 3G network is not blocked.
T-3, when it is determined that the 3G network is blocked, reducing the network speed for transmitting the electric signal for transmitting the data at the moment.
Further, the network speed for transmitting the electric signal at the moment can be directly reduced by half, namely, the network speed for transmitting the electric signal for transmitting the data at the moment is reduced to be half of the original network speed; or the half of the network speed for transmitting the electric signal at the moment can be compared with the network speed for receiving the electric signal at the moment, and the network speed which is larger in the network speed for receiving the electric signal at the moment is selected to serve as the current network speed for transmitting the electric signal; or may further comprise constructing a transfer queue for constraining the network speed of the short-time transfer electric signal, the capacity of the transfer queue being a value obtained by multiplying the received network speed at the time and the 3G network delay at the time.
The T-3 may further include: when the PLC programmable controller for transmitting the electric signals detects that the information capacity of the electric signals output by the unresponsive photoelectric detector is consistent with the capacity of the transmission queue, the electric signals output by the subsequent photoelectric detector are not transmitted. When it is determined in T-1 that the 3G network is not blocked, the data transmission mode at the time can be positioned, and allocation is not performed.
After the network speed for transmitting the electric signal for transmitting the data at the moment is reduced, the situation of the 3G network blocking state is detected through the 3G network blocking identification mode by virtue of the hysteresis change of the 3G network at the moment, and when the situation that the 3G network is not blocked is identified, the network speed for transmitting the electric signal can be actively increased according to the original electric signal transmission mode or according to specific situations.
The electric terminal equipment comprises a first radio frequency amplifier 10, a radio frequency power divider 11, a second radio frequency amplifier 12 and a low noise amplifier 13 which are electrically connected in sequence;
the low noise amplifier 13 is connected with a radio frequency input port of the Mach-Zehnder electro-optic intensity modulator 3 of the optical end device, and an output end of the photoelectric detector 9 of the optical end device is connected with an input end of the first radio frequency amplifier 10;
the output end of the photoelectric detector is connected with the input end of a PLC programmable controller, and the PLC programmable controller is connected with a cloud server in a 3G network through a 3G module.
The working network speed of the Mach-Zehnder electro-optic intensity modulator 3 is 40GHz;
the photoelectric detector 9 adopts a photoelectric detector with the working network speed of more than 40GHz;
the first radio frequency amplifier 10 and the second radio frequency amplifier 12 both adopt power amplifiers with maximum output power of more than 1W;
the radio frequency power divider 11 adopts a radio frequency power divider of 50:50;
the low noise amplifier 13 adopts a low noise amplifier with a gain of 20dB and a noise coefficient of less than 4 dB.
The electric terminal equipment also comprises a hysteresis change checking and detecting unit, a checking and identifying unit and a network speed weakening unit for transmitting electric signals, which are applied to the PLC, wherein the hysteresis change checking and detecting unit and the checking and identifying unit are used for transmitting the electric signals
The hysteresis change detection unit is used for detecting the hysteresis change of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
the detection and identification unit is used for detecting the situation of the 3G network blocking condition by means of the hysteresis change of the 3G network at the moment and identifying that the 3G network is not blocked at the moment by means of the situation of the 3G network blocking condition;
the network speed weakening unit for transmitting the electric signal is used for reducing the network speed for transmitting the electric signal for transmitting the data at the moment when the 3G network is confirmed to be blocked.
The search and identification unit may be configured to:
via validation formula (2):
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
l, m and t may be positive integers.
The hysteresis change search unit may be used in detail:
the hysteresis variation of the 3G network at this time is deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is a 3G network hysteresis variation at the first time point, m (l) is a 3G network hysteresis at the first time point, s is a preset importance coefficient at this time point, and s is greater than zero and less than one.
The network speed weakening unit for transmitting the electric signal can be used for:
when the 3G network is considered to be blocked, comparing the half network speed for transmitting the electric signal with the network speed for receiving the electric signal, and selecting the network speed which is larger than the network speed for receiving the electric signal as the current network speed for transmitting the electric signal.
The electric terminal equipment further comprises a queue creation unit which is used in the PLC and used for constructing a transmission queue for restraining the network speed of short-time transmission electric signals when the situation that the 3G network is blocked is confirmed, wherein the capacity of the transmission queue is a value obtained by multiplying the network speed received at the moment and the 3G network hysteresis at the moment.
The beneficial effects of the invention are as follows:
according to the invention, by detecting the hysteresis fluctuation of the 3G network at the moment, detecting the situation of the 3G network blocking condition by virtue of the hysteresis fluctuation of the 3G network at the moment, when the situation of the 3G network blocking condition is adopted to identify that the 3G network is blocked at the moment, reducing the network speed for transmitting the electric signal for transmitting data at the moment, and before the 3G network is blocked, the 3G network can be identified in advance to realize the prior allocation of the network speed for transmitting the electric signal, thereby overcoming the defect that the reduction time of the blocked 3G network in the 3G network with low network speed is not short, which is very unfavorable for the electric signal transmission performance output by a photoelectric detector.
Drawings
Fig. 1 is a partial connection structure diagram of an electrical terminal device of the present invention.
Fig. 2 is a flowchart of a method for the PLC programmable controller to transmit the electrical signal to a cloud server in a 3G network via a 3G module according to the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1-2, the working method of the electric terminal device includes:
the radio frequency signal output by the photoelectric detector 9 is amplified by the first radio frequency amplifier 10 and the second radio frequency amplifier 12 and then fed back to be input into the Mach-Zehnder electro-optic intensity modulator 3, so that the generation of the frequency-tunable microwave signal is completed;
the electric signal output by the photoelectric detector is transmitted to the PLC, and the PLC transmits the electric signal to a cloud server in a 3G network for display through the 3G module, so that the purpose of remote monitoring is achieved.
The method for the PLC to transmit the electric signal to the cloud server in the 3G network through the 3G module comprises the following sequentially executed processes:
t-1, searching for hysteresis variation of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
further, for the electrical signal transmitted from the photodetector, the 3G network delay is a time period between transmitting the information of the electrical signal output from the photodetector to the cloud server in the 3G network and receiving the response information of the cloud server in the 3G network; the 3G network hysteresis change here is a 3G network hysteresis representing a certain time point, and the 3G network hysteresis change condition at a previous time point, that is, the 3G network hysteresis change can be set into a type of screening operation, and the PLC programmable controller for transmitting the electric signal can detect the 3G network hysteresis change at this time through the change trend of the 3G network hysteresis in the total period of a preset interval period.
Further, in order to sum up the 3G network hysteresis at a pair of successive time points, the hysteresis variation of the 3G network at this time can be deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is a 3G network hysteresis variation at the first time point, m (l) is a 3G network hysteresis at the first time point, s is a preset importance coefficient at this time point, and s is greater than zero and less than one.
It is obvious that the 3G network hysteresis variation k (1) at the first time point may be zero, so that the 3G network hysteresis variation k (2) =m (2) -m (1) +s×k (1) at the latter time point, that is, k (2) =m (2) -m (1).
T-2, searching the situation of the 3G network blocking condition by virtue of the hysteresis change of the 3G network at the moment, and recognizing that the 3G network is not blocked at the moment by virtue of the situation of the 3G network blocking condition;
further, the hysteresis change of the 3G network at this time and the hysteresis change of the 3G network at the previous time point can be compared and searched, and if the recently calculated hysteresis change of the network at this time is higher than the previously summed hysteresis change, the 3G network is confirmed to be blocked; or whether the hysteresis variation of the 3G network meets the preset critical number or not can be checked, if so, the 3G network is blocked, so that the hysteresis variation of the 3G network is suddenly increased, and the 3G network is considered to be blocked.
Further, the following formula (2) may be used:
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
it is obvious that l, m and t may be positive integers.
Further, in the formula (2), the value obtained by subtracting l and m is smaller than 26, that is, the subtraction of l and m may be one, that is, m is the previous time point of l;
t is not constrained but depends on the situation.
When the determination formula (2) is satisfied, that is, when the 3G network hysteresis fluctuation at the moment is higher than the 3G network hysteresis fluctuation value at the previous moment m by more than the critical number T for blocking, determining that the 3G network is blocked at the moment, and executing T-3; otherwise, when the identification formula (2) is not satisfied, it is identified that the 3G network is not blocked.
T-3, when it is determined that the 3G network is blocked, reducing the network speed for transmitting the electric signal for transmitting the data at the moment.
Further, the network speed for transmitting the electric signal at the moment can be directly reduced by half, namely, the network speed for transmitting the electric signal for transmitting the data at the moment is reduced to be half of the original network speed; or the half of the network speed for transmitting the electric signal at the moment can be compared with the network speed for receiving the electric signal at the moment, and the network speed which is larger in the network speed for receiving the electric signal at the moment is selected to serve as the current network speed for transmitting the electric signal; or may further comprise constructing a transfer queue for constraining the speed of the short-time transfer of the electrical signal, the capacity of the transfer queue being a value obtained by multiplying the speed of the receiving network at the time and the 3G network delay at the time, so that the 3G network difference problem during detection can be handled.
Further, the T-3 may further include: when the PLC programmable controller for transmitting the electric signals detects that the information capacity of the electric signals output by the unresponsive photoelectric detector is consistent with the capacity of the transmission queue, the electric signals output by the subsequent photoelectric detector are not transmitted. When it is determined in T-1 that the 3G network is not blocked, the data transmission mode at the time can be positioned, and allocation is not performed.
Further, after the network speed for transmitting the electric signal for transmitting the data at this time is reduced, the situation of the 3G network blocking state is detected by means of the 3G network blocking identification mode by virtue of the delay variation of the 3G network at this time, and when the situation that the 3G network is not blocked is identified, the network speed for transmitting the electric signal can be actively increased according to the original electric signal transmission mode or according to specific situations.
By detecting the hysteresis fluctuation of the 3G network at this time, detecting the situation of the 3G network blocking situation by virtue of the hysteresis fluctuation of the 3G network at this time, when the situation of the 3G network blocking situation is adopted to determine that the 3G network is blocked at this time, reducing the network speed for transmitting the electric signal when the data is transmitted, and before the 3G network is blocked, the 3G network can be previously identified to be blocked, so that the network speed for transmitting the electric signal can be allocated in advance, the defect that the reduction time of the blocked 3G network in the 3G network with low network speed is not short at present and is very unfavorable for the electric signal transmission performance output by a photoelectric detector is overcome, in addition, the problem of 3G network blocking during the detection period can be controlled by constructing a transmission queue for restraining the short-time transmission of the electric signal, the frequency of the electric signal transmission unsmooth output by the photoelectric detector is favorably reduced, and the timeliness and smoothness of the electric signal transmission output by the photoelectric detector are ensured.
The electric terminal equipment comprises a first radio frequency amplifier 10, a radio frequency power divider 11, a second radio frequency amplifier 12 and a low noise amplifier 13 which are electrically connected in sequence; here, the rf power divider is used to split the transmitted rf signal, a part of which is fed back to the optical link for further transmission, and a part of which is used to generate a frequency tunable signal or for direct measurement. Low noise amplifiers are used to provide gain because the additional devices introduce some insertion loss, which needs to be provided in the link to offset the insertion loss.
The low noise amplifier 13 is connected with a radio frequency input port of the Mach-Zehnder electro-optic intensity modulator 3 of the optical end device, and an output end of the photoelectric detector 9 of the optical end device is connected with an input end of the first radio frequency amplifier 10;
along with the development of the internet of things technology, the remote monitoring of the electric signal output by the photoelectric detector is more and more mature, specifically, the output end of the photoelectric detector is connected with the input end of the PLC programmable controller, the PLC programmable controller is connected with a cloud server in a 3G network through a 3G module, the cloud server can be an arithmetic machine, thus, the electric signal output by the photoelectric detector can be transmitted to the PLC programmable controller, and the PLC programmable controller transmits the electric signal to the cloud server in the 3G network through the 3G module for display, so that the purpose of remote monitoring is achieved.
The working network speed of the Mach-Zehnder electro-optic intensity modulator 3 is 40GHz;
the photoelectric detector 9 adopts a photoelectric detector with the working network speed of more than 40GHz;
the first radio frequency amplifier 10 and the second radio frequency amplifier 12 both adopt power amplifiers with maximum output power of more than 1W;
the radio frequency power divider 11 adopts a radio frequency power divider of 50:50;
the low noise amplifier 13 adopts a low noise amplifier with a gain of 20dB and a noise coefficient of less than 4 dB.
The electric terminal equipment also comprises a hysteresis change checking and detecting unit, a checking and identifying unit and a network speed weakening unit for transmitting electric signals, which are applied to the PLC, wherein the hysteresis change checking and detecting unit and the checking and identifying unit are used for transmitting the electric signals
The hysteresis change detection unit is used for detecting the hysteresis change of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
the detection and identification unit is used for detecting the situation of the 3G network blocking condition by means of the hysteresis change of the 3G network at the moment and identifying that the 3G network is not blocked at the moment by means of the situation of the 3G network blocking condition;
the network speed weakening unit for transmitting the electric signal is used for reducing the network speed for transmitting the electric signal for transmitting the data at the moment when the 3G network is confirmed to be blocked.
Further, the search and identification unit may be configured in detail to:
via validation formula (2):
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
it is obvious that l, m and t may be positive integers.
Further, the hysteresis variation searching unit may be used in detail:
the hysteresis variation of the 3G network at this time is deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is a 3G network hysteresis variation at the first time point, m (l) is a 3G network hysteresis at the first time point, s is a preset importance coefficient at this time point, and s is greater than zero and less than one.
The network speed weakening unit for transmitting the electric signal can be used for:
when the 3G network is considered to be blocked, comparing the half network speed for transmitting the electric signal with the network speed for receiving the electric signal, and selecting the network speed which is larger than the network speed for receiving the electric signal as the current network speed for transmitting the electric signal.
The electric terminal equipment further comprises a queue creation unit which is used in the PLC and used for constructing a transmission queue for restraining the network speed of short-time transmission electric signals when the situation that the 3G network is blocked is confirmed, wherein the capacity of the transmission queue is a value obtained by multiplying the network speed received at the moment and the 3G network hysteresis at the moment.
While the present invention has been described by way of examples, it will be understood by those skilled in the art that the present disclosure is not limited to the examples described above, and various changes, modifications and substitutions can be made without departing from the scope of the present invention.
Claims (8)
1. A method of operating an electrical terminal device, comprising:
the radio frequency signals output by the photoelectric detector are amplified by the first radio frequency amplifier and the second radio frequency amplifier and then fed back to the Mach-Zehnder electro-optic intensity modulator to finish the generation of the frequency-tunable microwave signals;
the electric signal output by the photoelectric detector is transmitted to a PLC programmable controller, and the PLC programmable controller transmits the electric signal to a cloud server in a 3G network for display through a 3G module;
the method for the PLC to transmit the electric signal to the cloud server in the 3G network through the 3G module comprises the following sequentially executed processes:
t-1, searching for hysteresis variation of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
t-2, searching the situation of the 3G network blocking condition by virtue of the hysteresis change of the 3G network at the moment, and recognizing that the 3G network is not blocked at the moment by virtue of the situation of the 3G network blocking condition;
t-3, when it is determined that the 3G network is blocked, reducing the network speed for transmitting the electric signal for transmitting the data at the moment.
2. The method according to claim 1, wherein the 3G network delay is a time period between transmitting information of an electrical signal output by a photodetector to a cloud server in the 3G network and receiving response information of the cloud server in the 3G network; the 3G network hysteresis change here is a 3G network hysteresis representing a certain time point, and the 3G network hysteresis change condition at the previous time point, that is, the 3G network hysteresis change can be set into a type of screening operation, and the PLC programmable controller for transmitting the electric signal can find out the 3G network hysteresis change at this time through the 3G network hysteresis change trend within the preset interval period of the total section;
in the case of 3G network hysteresis for a pair of successive time points in total, the hysteresis variation of the 3G network at this time can be deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is a 3G network hysteresis variation at the first time point, m (l) is a 3G network hysteresis at the first time point, s is a preset importance coefficient at this time point, and s is greater than zero and less than one.
3. The method for operating an electrical device according to claim 1, wherein the identifying that the 3G network has a non-blocking manner includes:
comparing and searching the hysteresis variation of the 3G network at the moment with the hysteresis variation of the 3G network at the previous moment, and if the recently calculated hysteresis variation of the network at the moment is higher than the previously summed hysteresis variation, identifying that the 3G network is blocked; or whether the hysteresis variation of the 3G network meets the preset critical number or not can be checked, if so, the 3G network is blocked, so that the hysteresis variation of the 3G network is suddenly increased, and the 3G network is determined to be blocked;
can be identified by equation (2):
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
l, m and t may be positive integers;
in the formula (2), the value obtained by subtracting l and m is smaller than 26, that is, the value obtained by subtracting l and m can be one, that is, m is the previous time point of l;
t is not constrained but depends on the specific situation;
when the determination formula (2) is satisfied, that is, when the 3G network hysteresis fluctuation at the moment is higher than the 3G network hysteresis fluctuation value at the previous moment m by more than the critical number T for blocking, determining that the 3G network is blocked at the moment, and executing T-3; otherwise, when the identification formula (2) is not satisfied, it is identified that the 3G network is not blocked.
4. The method of claim 1, wherein the means for reducing the network speed at which data is transmitted for transmitting electrical signals comprises:
the network speed for transmitting the electric signal can be directly reduced by half, namely, the network speed for transmitting the electric signal for transmitting the data at the moment is reduced to be half of the original network speed; or the half of the network speed for transmitting the electric signal at the moment can be compared with the network speed for receiving the electric signal at the moment, and the network speed which is larger in the network speed for receiving the electric signal at the moment is selected to serve as the current network speed for transmitting the electric signal; or may further comprise constructing a transfer queue for constraining the network speed of the short-time transfer electric signal, the capacity of the transfer queue being a value obtained by multiplying the received network speed at the time and the 3G network delay at the time.
5. The method of claim 1, wherein the T-3 further comprises: when the PLC programmable controller for transmitting the electric signals detects that the information capacity of the electric signals output by the unresponsive photoelectric detector is consistent with the capacity of the transmission queue, the electric signals output by the subsequent photoelectric detector are not transmitted; when the situation that the 3G network is not blocked at the moment is confirmed in the T-1, the data transmission mode at the moment can be positioned, and allocation is not executed;
after the network speed for transmitting the electric signal for transmitting the data at the moment is reduced, the situation of the 3G network blocking state is detected through the 3G network blocking identification mode by virtue of the hysteresis change of the 3G network at the moment, and when the situation that the 3G network is not blocked is identified, the network speed for transmitting the electric signal can be actively increased according to the original electric signal transmission mode or according to specific situations.
6. An electric terminal device is characterized by comprising a first radio frequency amplifier, a radio frequency power divider, a second radio frequency amplifier and a low noise amplifier which are electrically connected in sequence;
the low-noise amplifier is connected with a radio frequency input port of a Mach-Zehnder electro-optic intensity modulator of the optical terminal equipment, and an output end of a photoelectric detector of the optical terminal equipment is connected with an input end of the first radio frequency amplifier;
the output end of the photoelectric detector is connected with the input end of a PLC programmable controller, and the PLC programmable controller is connected with a cloud server in a 3G network through a 3G module;
the electric terminal equipment also comprises a hysteresis change checking and detecting unit, a checking and identifying unit and a network speed weakening unit for transmitting electric signals, which are applied to the PLC, wherein the hysteresis change checking and detecting unit and the checking and identifying unit are used for transmitting the electric signals
The hysteresis change detection unit is used for detecting the hysteresis change of the 3G network at the moment through totalizing 3G network hysteresis in a preset interval period;
the detection and identification unit is used for detecting the situation of the 3G network blocking condition by means of the hysteresis change of the 3G network at the moment and identifying that the 3G network is not blocked at the moment by means of the situation of the 3G network blocking condition;
the network speed weakening unit for transmitting the electric signal is used for reducing the network speed for transmitting the electric signal for transmitting the data at the moment when the 3G network is confirmed to be blocked.
7. The electrical end device of claim 6, wherein the mach-zehnder electro-optic intensity modulator has an operating network speed of 40GHz;
the photoelectric detector adopts a photoelectric detector with the working network speed of more than 40GHz;
the first radio frequency amplifier and the second radio frequency amplifier both adopt power amplifiers with maximum output power larger than 1W;
the radio frequency power divider adopts a radio frequency power divider with the ratio of 50:50;
the low noise amplifier adopts a low noise amplifier with gain of 20dB and noise coefficient of less than 4 dB.
8. The electrical terminal device according to claim 7, wherein the probe identification unit is configured to:
via validation formula (2):
k(l)>k(m)+t (2)
whether or not the congestion occurs in the 3G network is determined, wherein k (l) is 3G network hysteresis variation at the first time point, k (m) is 3G network hysteresis variation at the m-th time point, l > m and t are preset congestion critical numbers;
l, m and t may be positive integers;
the hysteresis change search unit may be used in detail:
the hysteresis variation of the 3G network at this time is deduced by the following equation (1):
k(l)＝m(l)–m(l-1)+s×k(l-1) (1)
here, k (l) is 3G network hysteresis variation at the first time point, m (l) is 3G network hysteresis at the first time point, where the first time point is the time point, s is a preset importance coefficient, and s is greater than zero and less than one;
the network speed weakening unit for transmitting the electric signal can be used for:
when the 3G network is considered to be blocked, comparing half of the network speed for transmitting the electric signal with the network speed for receiving the electric signal, and selecting the network speed greater than the network speed for receiving the electric signal as the current network speed for transmitting the electric signal;
the electric terminal equipment further comprises a queue creation unit which is used in the PLC and used for constructing a transmission queue for restraining the network speed of short-time transmission electric signals when the situation that the 3G network is blocked is confirmed, wherein the capacity of the transmission queue is a value obtained by multiplying the network speed received at the moment and the 3G network hysteresis at the moment.
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