CN107040588B - Anti-collision card swiping method and device for distributed agricultural discharge control system - Google Patents
Anti-collision card swiping method and device for distributed agricultural discharge control system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/003—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity for electricity
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
- G07F15/06—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity with means for prepaying basic charges, e.g. rent for meters
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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
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- 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
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Abstract
The invention relates to an anti-collision card swiping method and device of a distributed agricultural discharge control system, on the basis of CSMA/CA algorithm, considering the influence of the number of card swiping machines and the information sending times on MacMinBE, adjusting the MacMinBE numerical value according to the weighted value of the number of the nodes of the card swiping machines and the weighted value of the signal backoff times of the previous times during the communication of the previous times, and adding 1 to the MacMinBE when the number of the card swiping machines is greater than the weighted value of the number of the nodes of the card swiping machines during the communication of the previous times and NB is greater than the weighted value of the signal backoff times of the previous times; and when the number of the card swiping machines is smaller than the weighted value of the number of the card swiping machine nodes in the previous communication, and NB is smaller than the weighted value of the number of the previous communication backoff times, subtracting 1 from MacMinBE. Through the process, the self-adaptive regulation of MacMinBE is realized, the communication success rate when a plurality of card swiping machines communicate with the agricultural discharge control terminal is improved, the normal use of a user is ensured, and the user experience is enhanced.
Description
Technical Field
the invention relates to an anti-collision card swiping method and device of a distributed agricultural discharge control system, and belongs to the technical field of electricity consumption charging.
background
The farmland motor-pumped well irrigation is used as the most effective drought-resisting and moisture-preserving measure in the food main production areas such as the China, the West, the North and the like, and the state continuously provides a plurality of policies for supporting and guaranteeing agricultural drainage engineering construction for many years. At least two motor-pumped wells can be managed by one agricultural discharge control terminal in the current agricultural discharge control system, each motor-pumped well corresponds to one electric energy meter and one card swiping machine, as shown in figure 1, one agricultural discharge control terminal manages N electric energy meters, N card swiping machines and N external load switches, when the agricultural discharge control terminal is used, the card swiping machines acquire user card information and send the user card information to the agricultural discharge control terminal, the agricultural discharge control terminal processes the user card information, a processing result is sent to the card swiping machines, card writing operation is completed by the card swiping machines, the agricultural discharge control terminal controls the external load switches, and farmland irrigation is achieved. The agricultural charge control terminal and the card swiping machine adopt micro-power wireless communication, data transmission conflict can BE caused when a plurality of card swiping machines swipe cards simultaneously, in order to avoid the situation, before data is sent, the use right of a transmission medium is competed through a CSMA/CA (Carrier Sense Multiple Access/sharing Avoidance) mechanism, when a BLE field in a received beacon frame is 0, a backoff index BE (backoff index) is initialized to a MacMinBE value of an MAC layer, otherwise, the BE value is set to BE a small value of 2 and the MinBE, the MacMinBE is used as the minimum backoff index of the MAC layer, once the minimum backoff index is determined, the subsequent random backoff time slot is relatively fixed, the flexibility of the method is insufficient when different numbers of the card swiping machines and the agricultural charge control terminal simultaneously communicate, the card swiping machine fails to easily, the communication success rate of the agricultural charge control terminal and the card swiping machines and the plurality of the agricultural charge control terminals is reduced, affecting the normal use of farmers.
Disclosure of Invention
the invention aims to provide an anti-collision card swiping method of a distributed agricultural discharge control system, which aims to solve the problem of data transmission collision caused by simultaneous card swiping of a plurality of card swiping machines; the invention also provides an anti-collision card swiping device of the distributed agricultural discharge control system.
the invention provides an anti-collision card swiping method of a distributed agricultural discharge control system for solving the technical problems, which comprises the following steps:
1) Determining the weighted value of the node number of the card swiping machines in the previous communication for a plurality of times according to the number of the current agricultural discharge card swiping machines and the number of the communication nodes in the previous i times;
2) Determining the weighted value of the communication backoff times of the previous times;
3) Adjusting MacMinBE according to the obtained weighted value of the number of the nodes of the card reader during the previous communication and the weighted value of the number of the communication backoff times of the previous communication,
when N > NAve and NB > NBAve are simultaneously satisfied, adding 1 to the MacMinBE value, MacMinBE ═ MacMinBE +1,
When N < NAve and NB < NBAve are satisfied simultaneously, subtracting 1 from MacMinBE value, MacMinBE ═ MacMinBE-1,
otherwise the MacMinBE remains the same,
Wherein N is the number of the current card swiping machines and tools, NAve is the weighted value of the number of the nodes of the card swiping machines and tools in the previous communication, NB is the retreating times of the current card swiping machines and tools, NBAve is the weighted value of the retreating times of the previous communication, and MacMinBE is the minimum retreating index of an MAC layer;
4) and carrying out conflict detection on the distributed agricultural discharge control system according to the adjusted MacminBE value.
further, the weighted value of the number of nodes of the card reader during the previous communication is as follows:
wherein Ni is the number of the communication nodes of the previous i times, Num1 is an empirical value, NAve is a weighted value of the number of the nodes of the card reader during the previous Num1 times of communication, and alpha i is a node number weighting coefficient.
Further, the previous communication backoff number weighted value NBAve is:
Wherein NBAve is the current Num2 communication backoff number weighting value, β i is the communication backoff number weighting coefficient, and NBi is the previous i communication backoff numbers.
further, the step 4) adopts a CSMA/CA collision detection algorithm.
The invention also provides an anti-collision card swiping device of the distributed agricultural discharge control system, which comprises a card swiping machine node number weighted value calculating module, a communication backoff time weighted value calculating module, a MacMinBE adjusting module and a collision detecting module,
the card swiping machine node number weighted value calculating module is used for determining the weighted value of the number of the card swiping machine nodes in a plurality of previous communications according to the number of the current agricultural discharge card swiping machines and the number of the communication nodes in the previous i times;
the communication backoff frequency weighted value calculation module is used for determining a plurality of previous communication backoff frequency weighted values;
The MacMinBE adjusting module is used for adjusting the MacMinBE according to the obtained weighted value of the number of the nodes of the card swiping machine during the previous communication and the weighted value of the number of the communication backoff times of the previous communication,
when N > NAve and NB > NBAve are simultaneously satisfied, adding 1 to the MacMinBE value, MacMinBE ═ MacminBE +1,
when N < NAve and NB < NBAve are satisfied simultaneously, subtracting 1 from MacMinBE value, MacMinBE ═ MacMinBE-1,
Otherwise the MacMinBE remains the same,
wherein N is the number of the current card swiping machines and tools, NAve is the weighted value of the number of the nodes of the card swiping machines and tools in the previous communication, NB is the retreating times of the current card swiping machines and tools, NBAve is the weighted value of the retreating times of the previous communication, and MacMinBE is the minimum retreating index of an MAC layer;
And the conflict detection module is used for carrying out conflict detection on the distributed agricultural discharge control system according to the adjusted MacMinBE value.
Further, the calculation formula adopted by the card swiping machine node number weighted value calculation module is as follows:
wherein Ni is the number of the communication nodes of the previous i times, Num1 is an empirical value, NAve is a weighted value of the number of the nodes of the card reader during the previous Num1 times of communication, and alpha i is a node number weighting coefficient.
Further, the calculation formula adopted by the communication backoff number weighted value calculation module is as follows:
Wherein NBAve is the current Num2 communication backoff number weighting value, β i is the communication backoff number weighting coefficient, and NBi is the previous i communication backoff numbers.
further, the collision detection module adopts a CSMA/CA collision detection algorithm to perform collision detection.
on the basis of CSMA/CA algorithm, considering the influence of the number of the card swiping machines and the information sending times on MacMinBE, adjusting the MacMinBE value according to the weighted value of the number of the nodes of the card swiping machines and the weighted value of the backoff times of the previous times during the communication, and adding 1 to the MacMinBE when the number of the card swiping machines is greater than the weighted value of the number of the nodes of the card swiping machines during the communication of the previous times and the backoff times is greater than the weighted value of the backoff times of the previous times; and when the number of the card swiping machines is smaller than the weighted value of the number of the card swiping machine nodes in the previous communication, and NB is smaller than the weighted value of the number of the previous communication backoff times, subtracting 1 from MacMinBE. Through the process, the self-adaptive regulation of MacMinBE is realized, the communication success rate when a plurality of card swiping machines communicate with the agricultural discharge control terminal is improved, the normal use of a user is ensured, and the user experience is enhanced.
Drawings
FIG. 1 is a topological diagram of a distributed agricultural cost control system;
FIG. 2 is a flow chart of the MacMinBE adaptive algorithm of the present invention;
FIG. 3 is a CSMA/CA algorithm improvement flow chart.
Detailed Description
the following further describes embodiments of the present invention with reference to the drawings.
Embodiment of anti-collision card swiping method of distributed agricultural discharge control system
On the basis of the CSMA/CA algorithm, the influence of the number of the card swiping machines and the information sending times on MacMinBE is considered, the MacMinBE value is adjusted according to the weighted value of the number of the nodes of the card swiping machines and the weighted value of the signal backoff times of the previous times during the communication of the previous times, and when the number of the card swiping machines is larger than the weighted value of the number of the nodes of the card swiping machines during the communication of the previous times and the backoff times is larger than the weighted value of the signal backoff times of the previous times, the MacMinBE is added by 1; when the number of the card swiping machines is smaller than the weighted value of the number of the card swiping machine nodes in the previous communication, and NB is smaller than the weighted value of the number of the previous communication backoff times, subtracting 1 from MacMinBE; otherwise the MacMinBE value is unchanged. And finally, carrying out conflict detection according to the adjusted MacMinBE value.
an agricultural charge control terminal can manage at least two motor-pumped wells, and each motor-pumped well corresponds to an electric energy meter and a card swiping machine tool. A specific agricultural discharge control system is taken as an example for explanation, the agricultural discharge control system in this example is shown in fig. 1, and includes an agricultural discharge control terminal, N channel converters, N three-phase electric energy meters, an external load switch, and N card swiping machines, the agricultural discharge control terminal is connected with the corresponding three-phase electric energy meter and the card swiping machine through each channel converter, and each channel converter provides 12V direct current for the corresponding card swiping machine. The agricultural discharge control terminal is used for realizing acquisition and charge control management of power consumption data, the electric energy meter is used for metering the power consumption data and sending the metering data to the charge control terminal, the card swiping machine is used for acquiring user card information and sending the user card information to the agricultural discharge control terminal, the user card information is processed by a charge control module of the agricultural discharge control terminal and sent to the card swiping machine, the card swiping machine completes card writing operation through an interaction module of the card swiping machine in actual use, the agricultural discharge control terminal is installed in a box body of a distribution transformer of a transformer area, the electric energy meter is installed in a motor-well power distribution metering box, the card swiping machine is installed on a wire rod outside the metering box, the card swiping machine provides a 12V power supply and two RS485 _ buses through a channel converter, one bus is communicated with the electric energy meter, the other bus is communicated with the card swiping machine, a communication module of a CAN bus or a power line carrier is embedded in the agricultural discharge control terminal, real-time communication between the intelligent electric meter and the card swiping machine is achieved by converting a CAN bus, a broadband carrier or a micropower wireless module into an RS485 module, and automatic acquisition of metering information and card swiping power consumption management are completed.
when a plurality of card swiping machines and tools swipe cards simultaneously, data transmission conflict can be caused, and in order to improve the success rate of data transmission, on the basis of the CSMA/CA algorithm, the invention considers the influence of the number of the card swiping machines and the information sending times on the MacMinBE, and adopts the MacMinBE adaptive weighting algorithm, the flow chart of the MacMinBE adaptive weighting algorithm is shown in figure 2, and after the MacMinBE adaptive algorithm is added by the CSMA/CA algorithm, the flow chart is shown in figure 3, and the specific process is as follows:
1. and determining a node number weighting coefficient and a weighting value of the node number of the card swiping machine during previous communication according to the current card swiping machine number and the number of the communication nodes of the previous i times.
n is the number of the current card swiping machines and tools, and Ni is the number of the communication nodes of the previous i times; num1 is an empirical value, which can be 5 in this embodiment, NAve is a weighted value of the number of nodes of the card reader during the previous Num1 communications, and α i is a weighted coefficient of the number of nodes.
2. and determining the weighted value of the backoff times of the previous communication.
wherein NBAve is the current Num2 communication backoff number weighting value, and β i is the communication backoff number weighting coefficient.
3. and adjusting MacMinBE according to the obtained weighted value of the number of the nodes of the card swiping machine during the previous communication and the weighted value of the number of the communication backoff times of the previous communication.
When N > NAve and NB > NBAve are simultaneously satisfied, adding 1 to the MacMinBE value, wherein MacMinBE is MacMinBE + 1;
When N < NAve and NB < NBAve are simultaneously satisfied, subtracting 1 from the MacMinBE value, wherein MacMinBE-1;
otherwise MacMinBE remains unchanged.
4. And (3) carrying out conflict detection on the simultaneous card swiping of a plurality of card swiping machines according to the adjusted MacMinBE, wherein the specific flow is shown in figure 3, and the specific process is as follows:
Firstly, when a BLE field in a received beacon frame is 0, initializing a Backoff index BE (Backoff latency, namely each Backoff waiting time) to a MacMinBE value of a MAC layer, otherwise, setting the BE value to BE the smaller of 2 and the MacMinBE; then randomly avoiding 2BE-1 time slots and carrying out CCA detection on the idle channel; when the channel is empty, subtracting 1 from the length CW of the collision window (namely, the backoff waiting time value of each time, the initial value of the CW is 2, and the maximum value is 31), and when the length CW of the collision window is zero, judging that the access of the card reader is successful, otherwise, carrying out CCA detection again; when the channel is judged to BE busy, resetting CW to 2, adding 1 to the backoff number NB, judging that the card swiping machine fails to access when the backoff number NB is greater than the backoff upper limit, and otherwise, carrying out backoff again.
Through the process, when a plurality of card swiping machines swipe cards simultaneously, the communication success rate of the card swiping machines and the agricultural expense control terminal can be improved.
embodiment of anti-collision card swiping device of distributed agricultural discharge control system
the device in the embodiment comprises a card swiping machine node number weighted value calculation module, a communication backoff time weighted value calculation module, a MacMinBE adjustment module and a conflict detection module, wherein the card swiping machine node number weighted value calculation module is used for determining the weighted value of the number of the card swiping machine nodes in the previous communication for a plurality of times according to the number of the current agricultural discharge card swiping machines and the number of the communication nodes in the previous i times; the communication backoff frequency weighted value calculation module is used for determining a plurality of previous communication backoff frequency weighted values; the MacMinBE adjusting module is used for adjusting MacMinBE according to the obtained weighted value of the number of nodes of the card swiping machine tool in the previous communication and the weighted value of the communication backoff times of the previous communication, when N is larger than NAve and NB is larger than NBAve and simultaneously meets, the numerical value of MacMinBE is added with 1, MacMinBE is MacMinBE +1, when N is smaller than NAve and NB is smaller than NBAve and simultaneously meets, the numerical value of MacMinBE is reduced by 1, MacMinBE is MacMinBE-1, otherwise MacMinBE is kept unchanged, wherein N is the number of the current card swiping machine tool, NAve is the weighted value of the number of the nodes of the card swiping machine tool in the previous communication, NB is the backoff times of the current card swiping machine tool, AvNBe is the communication backoff times of the previous communication, and MacMinBE is the backoff index of the MAC layer; and the conflict detection module is used for carrying out conflict detection on the distributed agricultural discharge control system according to the adjusted MacMinBE value. The specific implementation means of each module has been described in the embodiment of the method, and is not described herein again.
Claims (4)
1. an anti-collision card swiping method of a distributed agricultural discharge control system is characterized by comprising the following steps:
1) determining the weighted value of the node number of the card swiping machines in the previous communication for a plurality of times according to the number of the current agricultural discharge card swiping machines and the number of the communication nodes in the previous i times;
2) Determining the weighted value of the communication backoff times of the previous times;
3) adjusting MacMinBE according to the obtained weighted value of the number of the nodes of the card reader during the previous communication and the weighted value of the number of the communication backoff times of the previous communication,
when N > NAve and NB > NBAve are simultaneously satisfied, adding 1 to the MacMinBE value, MacMinBE ═ MacMinBE +1,
when N < NAve and NB < NBAve are simultaneously satisfied, subtracting 1 from the MacminBE value, MacminBE ═ MacMinBE-1,
Otherwise the MacMinBE remains the same,
Wherein N is the number of the current card swiping machines and tools, NAve is the weighted value of the number of the nodes of the card swiping machines and tools in the previous communication, NB is the retreating times of the current card swiping machines and tools, NBAve is the weighted value of the retreating times of the previous communication, and MacMinBE is the minimum retreating index of an MAC layer;
4) Performing conflict detection on the distributed agricultural discharge control system according to the adjusted MacMinBE value;
the weighted value of the node number of the card swiping machine during the previous communication is as follows:
Wherein Ni is the number of the communication nodes of the previous i times, Num1 is an empirical value, NAve is a weighted value of the number of the nodes of the card reader during the previous Num1 times of communication, and alpha i is a node number weighting coefficient;
the previous communication backoff times weighted value NBAve is:
wherein NBAve is the current Num2 communication backoff number weighting value, β i is the communication backoff number weighting coefficient, and NBi is the previous i communication backoff numbers.
2. the anti-collision card swiping method of the distributed agricultural discharge control system according to claim 1, wherein the step 4) adopts a CSMA/CA collision detection algorithm.
3. an anti-collision card swiping device of a distributed agricultural discharge control system is characterized by comprising a card swiping machine node number weighted value calculating module, a communication backoff time weighted value calculating module, a MacMinBE adjusting module and a collision detecting module,
the card swiping machine node number weighted value calculating module is used for determining the weighted value of the number of the card swiping machine nodes in a plurality of previous communications according to the number of the current agricultural discharge card swiping machines and the number of the communication nodes in the previous i times;
the communication backoff frequency weighted value calculation module is used for determining a plurality of previous communication backoff frequency weighted values;
the MacMinBE adjusting module is used for adjusting the MacMinBE according to the obtained weighted value of the number of the nodes of the card swiping machine during the previous communication and the weighted value of the number of the communication backoff times of the previous communication,
when N > NAve and NB > NBAve are simultaneously satisfied, adding 1 to the MacMinBE value, MacMinBE ═ MacMinBE +1,
when N < NAve and NB < NBAve are satisfied simultaneously, subtracting 1 from MacMinBE value, MacMinBE ═ MacMinBE-1,
otherwise the MacMinBE remains the same,
Wherein N is the number of the current card swiping machines and tools, NAve is the weighted value of the number of the nodes of the card swiping machines and tools in the previous communication, NB is the retreating times of the current card swiping machines and tools, NBAve is the weighted value of the retreating times of the previous communication, and MacMinBE is the minimum retreating index of an MAC layer;
The conflict detection module is used for carrying out conflict detection on the distributed agricultural discharge control system according to the adjusted MacminBE value;
The card swiping machine node quantity weighted value calculation module adopts the following calculation formula:
wherein Ni is the number of the communication nodes of the previous i times, Num1 is an empirical value, NAve is a weighted value of the number of the nodes of the card reader during the previous Num1 times of communication, and alpha i is a node number weighting coefficient;
the calculation formula adopted by the communication backoff number weighted value calculation module is as follows:
wherein NBAve is the current Num2 communication backoff number weighting value, β i is the communication backoff number weighting coefficient, and NBi is the previous i communication backoff numbers.
4. The anti-collision card swiping device of the distributed agricultural discharge control system according to claim 3, wherein the collision detection module adopts a CSMA/CA collision detection algorithm to perform collision detection.
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