CN111988681A - NB-loT-based smart electric meter communication method and system - Google Patents
NB-loT-based smart electric meter communication method and system Download PDFInfo
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Abstract
The invention discloses an intelligent electric meter communication method and system based on NB-loT, and relates to the technical field of communication of Internet of things. And acquiring an automatic table look-up item set and meter reading parameters issued by the platform side in real time through the NB module according to a preset initialized uploading flow task execution list. And selecting one item in the automatic table look-up item set, and reporting the meter reading data to the platform side through the NB module after a trigger condition is met. After the item is completed, a new item is selected from the set of automatic table look-up items to be completed until all items in the set of automatic table look-up items are completed. The invention can intelligently collect meter reading data, and is convenient and simple to install; the communication protocol standard is unified, the acquisition efficiency is high, and the cost is low.
Description
Technical Field
The invention relates to the technical field of communication of the Internet of things, in particular to an NB-loT-based smart meter communication method and system.
Background
In the electric energy meter centralized reading scheme, for electric meters which are distributed in too dispersed installation places, a 485 bus scheme is adopted, the wiring cost is very high, and the operation and maintenance cost is also high; if the PLC scheme is adopted, the laying cost of a special communication line can be saved, but the utilization rate of data acquisition equipment is low, the communication quality is reduced due to factors such as electromagnetic interference of a power transmission network and the like, and the reading/control experience of the meter is seriously influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the NB-loT-based smart meter communication method and system, which can simplify the copying of the smart meter, improve the safety and reliability of the copying and are convenient to maintain.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a method for communicating a smart meter based on NB-loT, which includes:
according to a task sequence in a preset initialization process task execution list, carrying out communication, detection and initialization on an intelligent electric meter and an NB module thereof, configuring the NB module to enable the NB module to be added into an NB-IoT network, and connecting a platform side;
according to a preset initialized uploading flow task execution list, acquiring an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to a platform side through the NB module;
after the item is completed, a new item is selected from the set of automatic table look-up items to be completed until all items in the set of automatic table look-up items are completed.
As a preferred embodiment, if an exception is found in the task execution process in the process of initializing the process task execution list or automatically uploading the process task execution list, the exception-repaired process task execution list is loaded.
As a preferred embodiment, the loading exception repair flow task execution list includes:
restarting the NB module;
starting the minimum function mode of the NB module;
clearing the prior frequency point of the NB module;
starting a full-function mode of the NB module;
sending a network access instruction for joining the NB-IoT network, waiting for preset response time when the network access instruction responds successfully, and confirming that the repair is completed if the NB module is queried to access the network successfully;
and if the NB module fails to access the network, reloading the abnormal repair flow task execution list, waiting for the preset standby time after repeatedly loading the preset times, and reloading the abnormal repair flow task execution list.
As a preferred embodiment, the communicating, detecting and initializing the smart meter and the NB module thereof includes:
reporting an error when the read-write memory is abnormal;
detecting a downlink interface of the intelligent electric meter, establishing a preset instruction frame for reading the communication address, sending the instruction frame for reading the communication address to the intelligent electric meter through the downlink interface, and storing the address in a response frame of the intelligent electric meter;
initializing an NB module, and after confirming that the response is successful, configuring the NB module into a manual network access mode, and configuring network access parameters and a working mode of the NB module;
the network access parameters comprise IP addresses, port numbers and NB frequency points, and the working modes are a maximum function mode after obtaining IMEI codes of NB modules and ICCID code information of SIM, an eDRX function of the NB modules which are closed and a PSM function.
As a preferred embodiment, the configuring the NB module to join an NB-IoT network includes:
and triggering the NB module to perform network attachment action, waiting for preset time after the NB module successfully answers, sending a query instruction, and querying the network access state of the NB module.
As a preferred embodiment, the acquiring, after the trigger condition is met, meter reading data corresponding to the upload data category in the smart meter, creating an upload data frame according to the upload data format, and reporting the meter reading data to the platform side through the NB module includes:
and the trigger condition is an uploading time point, an uploading data frame is established according to the uploading data format, the data frame is sent to the platform side through the NB module at the uploading time point, and whether the uploading is successful or not is confirmed.
As a preferred embodiment, receiving platform-side data includes:
extracting issued command data from a received instruction frame according to a preset data communication format, judging whether the issued command data is legal or not, and if not, discarding the issued command data;
extracting the communication address code in the issued command data, matching the communication address code with a pre-stored communication address list, and confirming an execution object;
if the execution object is an NB module, configuring the NB module according to the issued command data, and sending a response frame of the NB module to a platform side through the NB module;
and if the execution object is the intelligent electric meter, configuring the intelligent electric meter according to the issued command data, and sending a response frame of the intelligent electric meter to a platform side through the NB module.
As a preferred embodiment, the trigger condition is the end of a time period or the arrival of a set point in time.
In a second aspect, the invention further provides a smart meter communication method based on the NB-loT, which includes:
the method comprises the following steps that a control unit carries out communication, detection and initialization on an intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, and the NB module is configured to be added into an NB-IoT network and connected with a platform side;
the platform side sends an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the method comprises the steps that a control unit obtains an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module according to a preset initialized uploading process task execution list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit selects one item in the automatic meter reading item set, acquires meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, constructs an uploading data frame according to the uploading data format, and reports the meter reading data to a platform side through the NB module;
the platform side receives the meter reading data;
after the control unit finishes the item, a new item is selected from the automatic table look-up item set to be finished until all items in the automatic table look-up item set are finished.
In a third aspect, the invention further provides a smart meter communication system based on NB-loT, which includes a platform side and a smart meter, where the smart meter includes a control unit:
the control unit is used for communicating, detecting and initializing the intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, configuring the NB module to join an NB-IoT network and connecting a platform side;
the platform side is used for sending an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the control unit is used for acquiring an automatic table look-up item set and meter reading parameters issued by the platform side in real time through the NB module according to a preset initialized uploading process task execution list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit is used for selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to the platform side through the NB module;
the platform side receives the meter reading data;
the control unit is used for selecting a new item from the automatic table look-up item set to be completed after the item is completed until all items in the automatic table look-up item set are completed.
Compared with the prior art, the invention has the advantages that:
according to the NB-loT-based smart meter communication method and system, the initialization process task execution list is set during the startup initialization network access period, the automatic uploading process task execution list is set for uploading meter reading data, each device on the smart meter is guaranteed to be executed according to the task sequence preset on each list, and therefore the smart meter is safer and more stable. Furthermore, the distributed intelligent electric meters are all incorporated into the NB-IoT network, the requirements of electric energy meter centralized reading and control schemes under various installation environments can be completely met based on the advantages of network coverage strength and stability of the NB-IoT and by means of the transmission capability of the NB-IoT with ultra-strong penetration capability, namely, the meter reading data can be directly transmitted through the network, the meter reading is more convenient, and the management is easy. Finally, the meter reading is carried out according to the task sequence by issuing the automatic uploading flow task execution list, the meter reading is more intelligent and orderly, meanwhile, based on the task, the meter reading protocol is more uniform, and the problems that the cost of 485 communication lines erected by existing remote electric energy meters is high, and the communication is seriously influenced by the electromagnetic interference of a PLC network are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings corresponding to the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of an embodiment of a smart meter communication method based on NB-loT according to the present invention;
FIG. 2 is a circuit structure diagram of an embodiment of a smart meter communication method based on NB-loT;
fig. 3 is a schematic diagram illustrating that a core MCU executes an AT instruction after various lists are loaded according to an embodiment of the NB-loT-based smart meter communication method of the present invention;
fig. 4 is a simple flow chart of a core of an embodiment of the NB-loT-based smart meter communication method of the present invention in different states.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides an intelligent electric meter communication method and system based on NB-loT, which can intelligently collect meter reading data and are convenient and simple to install; the communication protocol standard is unified, the acquisition efficiency is high, and the cost is low.
In order to achieve the technical effects, the general idea of the application is as follows:
according to a task sequence in a preset initialization process task execution list, carrying out communication, detection and initialization on an intelligent electric meter and an NB module thereof, configuring the NB module to enable the NB module to be added into an NB-IoT network, and connecting a platform side;
according to a preset initialized uploading flow task execution list, acquiring an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to a platform side through the NB module;
after the item is completed, a new item is selected from the set of automatic table look-up items to be completed until all items in the set of automatic table look-up items are completed.
In summary, the invention first executes sequential tasks on the list according to the initialization process task, so as to achieve connection between the smart meter and the NB module, the NB-IoT network, and the platform side, then obtains an automatic table lookup item set and meter reading parameters from the platform side through the NB module, and executes the tasks according to the preset automatic uploading process task execution list, thereby selecting an item in the automatic table lookup item set, and executing the tasks therein according to the task sequence, ensuring that the platform side can receive meter reading data uploaded in a fixed format by each type of smart meter after a trigger condition, and upload in a specific format, and saving processing resources and networks on the platform side.
It should be noted that NB-IoT refers to a narrowband Internet of Things, and Internet of Things (IoT) refers to connecting any object with a network through information sensing equipment according to a predetermined protocol, where the object performs information exchange and communication through an information propagation medium. The narrowband Internet of Things (NB-IoT) becomes an important branch of the world-wide Internet. The NB-IoT is constructed in a cellular network, only consumes about 180KHz of bandwidth, and can be directly deployed in a GSM network, a UMTS network or an LTE network so as to reduce the deployment cost and realize smooth upgrading. NB-IoT is an emerging technology in the IoT domain that supports cellular data connectivity for low power devices over wide area networks, also known as Low Power Wide Area Networks (LPWANs). The NB-IoT supports efficient connection of equipment with long standby time and higher requirement on network connection, and the NB-IoT network has an ultra-large coverage range and ultra-strong penetration capability and can provide very comprehensive indoor cellular data connection coverage; the NB-IoT network allows a plurality of devices to be accessed simultaneously, which is 50-100 times of the prior art, and according to the test, the prior NB-IoT network single cell base station can be accessed with 5 ten thousand terminal devices, so that the oversized connection can really realize the 'everything interconnection' of the Internet of things.
The IMEI is an International Mobile Equipment Identity (IMEI), which is a Mobile phone serial number and a Mobile phone serial number, and is used to identify Mobile communication Equipment such as each independent Mobile phone in a Mobile phone network, and is equivalent to an Identity card of a Mobile phone.
The ICCID of the SIM is an integrated circuit card identification number (ICCID is the SIM card number, which is equivalent to the identity card of a mobile phone number.)
The eDRX function of the NB module is the same as DRX, and the UE periodically enters a sleep state at some time to achieve the purpose of saving battery consumption. In the NB-IoT system, due to the service features, the energy consumption is more emphasized, and the eDRX is improved based on the DRX, which further reduces the consumption of electric energy.
The PSM function of the NB module is that the terminal does not detect whether there is paging data in the downlink. The PSM state will not exit as long as data transmission is needed at TAU and upstream. T3412 is a time of tau (tracking Area update), and T3324 is a timer for entering PSM in IDLE mode.
At present, the construction of nearly 40 million NB-IoT base stations throughout the country gradually achieves wide coverage throughout the country. Under the guidance of the Ministry of industry and communications, the network coverage of NB-IoT will be further promoted by optimization.
It should be further noted that the NB module includes an NB-IoT intelligent power meter communication module:
the NB-IoT intelligent electric energy meter communication module meets the electrical interface standard and the installation structure standard of the national power grid intelligent electric energy meter communication module. The existing PLC communication module or the small wireless communication module can be directly replaced;
the communication protocol between the NB-IoT intelligent electric energy meter communication module and the electric energy meter is based on DLT645-2007 electric energy meter communication protocol;
the intelligent electric energy meter communication module of the NB-IoT uploads core data of the telecom CoAP platform based on DLT645-2007 electric energy meter communication protocol content;
the NB-IoT intelligent electric energy meter communication module realizes the link establishment with the core service platform through the AT instruction operation of the NB-IoT standard communication module; realizing data interaction;
the NB-IoT intelligent electric energy meter communication module realizes a timing reading and uploading platform of the designated data of the intelligent electric energy meter through the information data of the operation parameters 'automatic uploading period' and 'automatic uploading task list' in the module.
In order to better understand the technical solution, the following detailed description is made with reference to specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a smart meter communication method based on NB-loT, which includes:
s1: according to a task sequence in a preset initialization process task execution list, the intelligent electric meter and an NB module thereof are communicated, detected and initialized, and the NB module is configured to be added into an NB-IoT network and connected with a platform side.
The invention realizes the connection, detection and initialization of the NB module through task triggering and an executing mechanism, and further configures the NB module to join the NB-IoT network and connect the platform side.
After each device is powered on, a pre-stored initialization process task execution list is loaded, tasks are executed according to the sequence in the initialization process task execution list, and the smart meter is guaranteed to be stably, reliably and safely added to the NB-IoT network.
For example, as shown in fig. 2, the MCU reads the meter, communicates the NB module, joins the NB-IoT network through the NB module, and connects to the platform side, and the MCU includes an uplink communication module, a downlink communication module, and a clock timing module. Preferably, the MCU has software and hardware reset functions for the NB standard module, and when the MCU detects that the operation state of the NB module is abnormal, the MCU starts the software reset or hardware reset function according to a design mechanism so as to force the NB module to enter a normal controllable working state.
The uplink communication module is based on a standard NB-IoT communication module, establishes a link with a core platform network through a standard AT instruction control module and realizes data interaction with a platform side;
the downlink communication module is used for implementing functions of reading specified data, issuing control instructions and the like on the intelligent electric energy meter based on the standard electric interface and communication protocol of the intelligent electric energy meter;
and the clock timing module is used for timing or overtime operation counting function.
Optionally, the communication module selects a standard NB communication module to be in butt joint with the core MCU through a serial port of a standard TTL level, and is simultaneously provided with a patch-type SIM card and an antenna lead-out 50 ohm matching port design (a PCB antenna or a spring antenna may be selected), so as to reduce the risk of external electrostatic damage and provide overall stability of the module; meanwhile, on the premise of ensuring the communication quality of the NB, the hardware cost of the module is reduced; the popularization adaptability is enhanced.
The communication module is provided with a local configuration port (TTL level) which can detect the correctness of internal operation data of the module and the MCU; the method and means for operation and maintenance of the module are enhanced, and the stability and safety of operation are improved.
The design of the geometric dimension of the communication module meets the design requirement of the communication module of the intelligent electric energy meter of the national power network standard, and the communication module of the existing PLC or small wireless electric energy meter can be directly replaced;
optionally, the standard electrical interface of the intelligent electric energy meter communication module of the present invention has the following functions:
a standard DC12V power supply input;
a full-duplex serial port interface with standard TTL level;
and (3) resetting the interface by a module control signal (pulling down the signal for 200 milliseconds when the electric energy meter has no data interaction for 24 hours).
As an optional embodiment, the communicating, detecting and initializing the smart meter and the NB module thereof includes:
reporting an error when the read-write memory is abnormal;
detecting a downlink interface of the intelligent electric meter, establishing a preset instruction frame for reading the communication address, sending the instruction frame for reading the communication address to the intelligent electric meter through the downlink interface, and storing the address in a response frame of the intelligent electric meter;
initializing an NB module, and after confirming that the response is successful, configuring the NB module into a manual network access mode, and configuring network access parameters and a working mode of the NB module;
the network access parameters comprise an IP address, a port number, NB frequency points, an IMEI code and an ICCID of the SIM, and the working mode is a maximum function mode, an eDRX function of a closed NB module and a PSM function.
For example, as shown in fig. 3 and 4, the NB module is an NB module, the initialization procedure task execution list is an initialization task list,
dividing according to the operation control content of the NB module, and defining and initially assigning a task list to be executed, wherein the task list to be executed comprises the following steps:
1. the NB module detects and initializes the task list: init _ lib [ i ];
2. an NB module network access operation task list; link _ lib [ j ];
3. the NB module processes the operation task list abnormally; ErrAct _ lib [ k ];
the initial assignment of the above task list only contains "total number of tasks" and "task number list"; for example, Init _ lib [ i ] { total number of tasks n, task _0, task _1, … …, task _ n-1 };
when the test and initialization task list is executed:
s101, defining a state mark of the NB module, which mainly comprises: initial values of Init _ is _ Over, Link _ is _ Ok and Mod _ is _ Err are assigned to zero, and the definitions of the flags are 'whether the module completes the initial state', 'whether the module accesses the network successfully' and 'whether the module is in an abnormal state';
s102, after the equipment is powered on, a mark 'Init _ is _ Over' is equal to 0, which indicates that the NB module does not complete initialization, at this time, a 'Task control trigger function' starts to be started, and firstly, the content of 'module detection and initialization Task list (Init _ Lib [ i ])' is called into a data structure body of Task _ Lib, so that:
all _ Cnt is the total number of tasks n;
Task_Lib.Lib[30]＝{task_0，task_1，……，task_n-1}；
simultaneously clearing Task _ lib.now _ Cnt to 0;
s103, sequentially triggering each AT instruction task in the initialization task list to execute, and sequentially waiting for an execution result, if an exception occurs, setting a mark Mod _ is _ Err, and entering an exception handling process; if all the operations are normal, setting 'Init _ is _ Over', indicating that the NB module completes all initialized operations and calls the contents of 'module network access operation Task list (Link _ Lib [ j ])' to a data structure body of the Task _ Lib to prepare to execute a network access operation flow;
s104, sequentially triggering and executing AT instructions according to the latest data loaded in the Task _ Lib structure, meanwhile, waiting for the response result of the NB module, carrying out corresponding processing, and entering an exception handling process if an exception occurs and a position mark Mod _ is _ Err is set; if all the parts are normal, setting 'Link _ is _ Ok' to indicate that the NB module has normally accessed the telecom CoAP core platform; the core MCU and the platform can carry out data interaction operation;
s105, when detecting that the mark Mod _ is _ Err is set in the execution process of the Task control trigger function or any other time period, the trigger function calls the contents of the module exception handling operation Task list (ErrAct _ Lib [ k ]) to a data structure body of the Task _ Lib to prepare for executing the operation flow of module exception handling;
further, as shown in fig. 3 and 4, in addition to the connection, detection and initialization of the NB module, the smart meter needs to be connected, detected and initialized:
t101, after the whole is electrified, the core MCU firstly detects whether the EEPROM, the downlink communication serial port (the communication interface with the electric energy meter) and the uplink communication serial port (the communication interface with the NB module) can normally work, and then executes an operation flow according to the internally stored operation parameters;
t102, the core MCU reads data in the key units of the EEPROM, performs inverse writing after inverse operation, and performs inverse comparison operation on the twice read data after reading again; if the comparison is normal, extracting the relevant operation parameters stored in the EEPROM and storing the relevant operation parameters in an RAM area for later use; otherwise, prompting that the user module has hardware faults and cannot work normally through the flashing mode of the indicator lamp;
t103, detecting whether a downlink communication serial port (a communication interface with the electric energy meter) is normal by the core MCU:
A. the core MCU executes bottom layer initialization operation on the downlink communication serial port;
B. the core MCU establishes an instruction frame of a general reading communication address in a standard 645 protocol, sends out the instruction frame to a communication port of the electric energy meter, and simultaneously starts a communication timeout counting mechanism;
c1, when the communication interface is normal, the serial port of the core MCU can quickly receive the instruction response frame from the electric energy meter; and at the moment, the core MCU stores the communication address of the electric energy meter extracted from the response frame, and simultaneously converts the communication address into the communication address of the module according to a specific format and stores the communication address. When the module receives an issued instruction from the platform side, the module determines whether the instruction is an instruction for the communication module or an instruction attribute for the electric energy meter according to the communication address information in the instruction frame;
c2, when the communication interface is abnormal, the serial port of the core MCU can not receive any data when the communication overtime counter overflows; the core MCU can continuously read and detect for multiple times, and if the response data frame on the serial port can not be obtained, the core MCU can prompt that the downlink communication serial port of the user module has hardware faults in a flashing mode of a downlink communication indicator lamp, and can not normally obtain the communication address and other data of the electric energy meter;
t104, the core MCU detects whether the uplink communication serial port (the communication interface with the NB module) is normal:
A. the core MCU executes bottom layer initialization operation on the uplink communication serial port;
B. the core MCU sends a detection AT instruction 'AT' in a character string format to the NB module main serial port; starting a communication timeout counting mechanism at the same time;
c1, when the communication interface is normal, the serial port of the core MCU can quickly receive the AT instruction response frame from the NB module; at the moment, the core MCU verifies that the communication of the serial port is normal; preparing to enter an initialization operation flow of an NB module;
c2, when the communication interface is abnormal, the serial port of the core MCU can not receive any data when the communication overtime counter overflows; the core MCU can continuously read and detect for multiple times, and if the AT instruction response frame of the NB module cannot be obtained, the core MCU can prompt that the uplink communication serial port of the user module has hardware faults in a flashing mode of the uplink communication indicator lamp and cannot normally control the NB standard module;
t105, the core MCU executes a series of AT instruction operations on the NB module through the AT instruction to complete the initialization operation before the module accesses the network:
A. the core MCU starts a module network access state indicator lamp through an instruction of ' AT + QLEDMODE ' being 1 ', and enters the next step after response is successful;
B. the core MCU closes the function of returning AT instructions to the serial port of the module through an instruction 'ATE 0', and the next step is carried out after response is successful;
C. the core MCU configures the module into a manual network access mode through an instruction of AT + NCONFIG ═ AUTOCONNECT, FALSE', and the core MCU enters the next step after response is successful;
D. the core MCU writes the IP address and the port number of the telecom CoAP service platform into the module through an instruction of 'AT + NCDP ═ 180.101.147.115,5683', and the next step is carried out after response is successful; (ii) a
E. The core MCU appoints an uplink Band value of the NB module to be an NB frequency point of telecommunication through an instruction of 'AT + NBAND ═ 5', and the next step is carried out after response is successful;
F. the core MCU sets the module as a maximum function mode through an instruction of 'AT + CFUN ═ 1', and enters the next step after response is successful;
G. the core MCU acquires the IMEI number of the NB module and the ICCID information of the SIM through instructions of 'AT + CGSN ═ 1' and 'AT + NCCID', stores the IMEI number and the ICCID information in the RAM area for calling (once the module is successfully accessed to the network, the ICCID information is uploaded to the platform for storage AT the first time), and enters the next step after response is successful;
H. the core MCU closes the eDRX function and the PSM function of the NB module by an instruction of 0,5 and 0 for AT + CPSMS, so that the core MCU can work in a real-time online state;
the initialization operation of the NB module, the acquisition of the information of the NB module and the configuration of the internal key parameters are completed through the operation;
as an optional embodiment, the configuring the NB module to join an NB-IoT network includes:
and triggering the NB module to carry out network attachment, waiting for preset time after response is successful, sending a query instruction, and querying the network access state of the NB.
For example, as shown in fig. 3 and 4, the core MCU performs a series of AT commands on the NB module through the AT commands to complete the network attachment of the module:
the U101 and the core MCU execute a network attachment action through a command that ' AT + CGATT ' is equal to 1 ', and the core MCU can start a waiting operation delayed for 300 seconds after response is successful;
u102, instruction "AT + CGATT? ", inquiring the network access state of the module; the response results were as follows:
A. when the response instruction is + CGATT: 1', the module is successfully accessed to the network and can perform data interaction with the platform;
B. when the response command is + CGATT: 0', the module network access failure is indicated, and the core MCU continuously performs 2 times of 300-second delay waiting and then inquires the network access state of the module again. If the network access failure state does not exist, the judgment module enters an abnormal processing flow.
It should be noted that, as shown in fig. 4, after the NB module successfully accesses the network, the core MCU may trigger data upload enable according to internal operation requirements; once the upload enable is started, the following operations are sequentially completed:
A. the core MCU reads the current signal intensity information of the module through an instruction 'AT + CSQ';
B. the core MCU builds an upload data frame (sending related data to the module by an instruction of AT + NMGS ═ length >, < data > "(data ═ real-time signal strength + length of data to be transmitted + content of data to be transmitted) according to a data communication format agreed with the telecom CoAP platform, and sends the related data to the module, and the module sends the related data to the platform side, and meanwhile the core MCU waits for a response result of the NB module;
c-1, when the module returns to OK, the data uploading platform is normal, the uploading and sending enable operation flow is finished, the enable flag is cleared, and the core MCU waits for the starting of the next uploading and sending enable;
c-2, when the module returns the ERR code, the uploading operation of the module is abnormal, the module needs to be uploaded again, and when the uploading operation is abnormal, the operation is continuously carried out for 3 times, the core MCU judges that the NB module enters an abnormal processing flow;
s2: acquiring an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module according to a preset initialized uploading flow task list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
after the intelligent electric meter is accessed to the NB-IoT network access platform side through the NB module, which data are needed by the platform side, the automatic meter reading item set and the meter reading parameters can be issued through the network, the task is executed through the preset initialization uploading process task list, and the required meter reading data can be uploaded according to the items in the automatic meter reading item set and the meter reading parameters. Preferably, as an alternative embodiment, the triggering condition is that the time period ends or the set time point is reached, and the receiving the data at the platform side includes:
issuing command data from an instruction frame according to a preset data communication format, judging whether the issued command data is legal or not, and if not, discarding the issued command data;
extracting the communication address code in the issued command data, matching the communication address code with a prestored address list and confirming an execution object;
if the execution object is an NB module, configuring the NB module according to the issued command data, and sending a response frame to a platform side through the NB module;
and if the execution object is an intelligent electric meter, configuring the intelligent electric meter according to the issued command data, and sending a response frame to a platform side through the NB module.
For example, as shown in fig. 4, the setting of the uplink communication serial port by the core MCU is an executed interrupt reception enable, so that once the NB module receives a platform-side uplink data frame, the NB module sends an AT command "AT + NMGR ═ length >, < data >" to the core MCU through the serial port:
s201, a core MCU provides standard 645 communication protocol data from an AT instruction frame according to a data communication format agreed with a telecom CoAP platform, and preliminarily judges the legality of the data (data structure, address code format and protocol data checksum); if not, the core MCU discards the data frame and recovers the normal state without processing; if the combination rule sets the uplink priority mark to prohibit other actions from being executed, the processing of the data frame is continued;
s202, the core MCU extracts the communication address code of the operation object of the current data frame according to a 645 protocol format and compares the communication address code with the address code of the communication module and the address code of the electric energy meter to distinguish the execution object attribute of the data frame:
A. when the execution object of the data frame is a communication module, the execution object is executed in a module protocol analysis processing function, a return response frame of a processing result is generated after the corresponding operation (reading data instruction operation or writing data instruction operation) of the instruction is completed, and meanwhile, a 'data upload enable' mark in a data upload flow is started to prepare for uploading the content of the response frame;
B. and when the execution object of the data frame is the electric energy meter, executing in the protocol analysis processing function of the electric energy meter, generating a response frame returning a processing result after finishing corresponding operation of the instruction, starting a 'data uploading enable' mark in a data uploading process, and preparing to upload the content of the response frame.
S3: selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to a platform side through the NB module;
preferably, after the trigger condition is met, obtaining meter reading data of the smart electric meter, and reporting the meter reading data to the platform side through the NB module according to the upload data format, including:
and according to the uploading data format, establishing a data frame, sending the data frame to a platform side through an NB module at a preset time point, and after the successful uploading is confirmed, confirming the next uploading task.
For example, the core MCU in the smart meter performs step S3, and the specific process is as follows:
s301, establishing a 645 protocol uploading data frame of the IMEI code of the NB module and the ICCID code data information of the SIM card according to the obtained IMEI code of the core MCU, simultaneously starting a 'data uploading enabling' mark in a data uploading process, and preparing to upload the content of the current data frame; the uploading operation is executed once only after the NB module is successfully accessed to the network, if the platform side needs to check the data again, the reading instruction for reading the data can be issued;
s302, executing flow operation of automatically reading and uploading relevant data of the electric energy meter according to specific task content (data identification in a 645 protocol) in the automatic uploading task list and the periodic time of timed uploading:
A. the starting mechanism for automatically copying and reading data and uploading is provided with two ways:
1, under the condition that an NB module successfully accesses a network, after a core MCU completes automatic uploading of an IMEI code and an ICCID, the core MCU judges the effective number of an uploading task list (comprising 20 task storage spaces) and the effectiveness of uploaded cycle time data, and an automatic reading and uploading mechanism can be started only if two data have nonzero effectiveness simultaneously;
2 when the automatic reading and uploading mechanism can be regularly and normally executed, any data in the content of the task list or the uploading cycle time changes, but the zero clearing operation is not performed, the core MCU starts a new round of automatic reading and uploading mechanism at the first time after the data to be modified completes the EEPROMPROM storage operation;
B. when a current new round of automatic reading and uploading mechanism is started, the core MCU starts a timer to count and starts a new round of uploading cycle time counting action;
C. after the current automatic reading and uploading mechanism is started, the core MCU sequentially extracts tasks of each task unit in the uploaded task list and constructs data reading data instruction frame content of the electric energy meter according to a data format of a 645 communication protocol;
D. the core MCU sends the content of the data reading data instruction frame to the electric energy meter through the downlink communication serial port, and simultaneously starts a communication timeout counting mechanism;
e1, when the communication interface is normal, the serial port of the core MCU can quickly receive the instruction response frame from the electric energy meter; at the moment, the core MCU packs the response frame into protocol data to be uploaded integrally, and simultaneously starts a data uploading enable mark in a data uploading process to prepare for uploading the content of the current data frame;
e2, when the communication interface is abnormal, the serial port of the core MCU can not receive any data when the communication overtime counter overflows; at the moment, the core MCU can continuously read twice, if the response data frame on the serial port can not be obtained, the core MCU can automatically establish the response data frame with the overtime error as the protocol data to be uploaded, and simultaneously starts a data uploading enabling mark in the data uploading process to prepare for uploading the content of the current data frame;
F. after the data uploading process operation is finished, the core MCU executes 'one reduction' operation on the number of the remaining operation tasks, executes the next reading task in the task list when the number of the remaining tasks is not zero, starts a 'data uploading enable' mark in the data uploading process and prepares to upload the content of the current data frame; until all the effective reading and uploading tasks are finished, the core MCU quits the automatic reading and uploading data mechanism and waits for the next new round of automatic reading and uploading mechanism to be started;
s4: after the item is completed, a new item is selected from the set of automatic table look-up items to be completed until all items in the set of automatic table look-up items are completed.
After one item in the automatic table look-up item set is completed, the next item can be processed, and items issued by the platform side are completed one by one according to the automatic upload process task execution list, so that the communication between the distributed intelligent electric meter and the platform side through the NB-IoT network is realized, namely, the intelligent upload of the meter reading data is realized.
As a preferred embodiment, if an exception is found in the task execution process in the process of initializing the process task execution list or automatically uploading the process task execution list, the exception-repaired process task execution list is loaded.
Specifically, loading the execution list of the abnormal repair flow task includes:
restarting the NB module;
starting the minimum function mode of the NB module;
clearing a priori frequency point of the NB module;
starting a full-function mode of the NB module;
sending a network access instruction for joining the NB-IoT network, waiting for preset response time when the network access instruction responds successfully, and confirming that the repair is completed if the NB module is queried to access the network successfully;
and if the NB module fails to access the network, reloading the abnormal repair flow task execution list, waiting for the preset standby time after repeatedly loading the preset times, and reloading the abnormal repair flow task execution list.
For example, the core MCU needs to enter an "exception handling procedure" after an access exception occurs or a data transmission service fails in the AT instruction operation of the NB module, and executes the following AT instruction operation:
A. the core MCU restarts the NB module through an instruction 'AT + NRB', and enters the next step after response is successful;
B. the core MCU starts the minimum function mode of the NB module by an instruction of 'AT + CFUN ═ 0', and enters the next step after response is successful;
C. the core MCU clears the prior frequency point of the NB module through an instruction 'AT + NCSEARFCN', and the next step is carried out after the response is successful;
D. the core MCU starts all NB modules through an instruction of' AT + CFUN ═ 1
The functional mode enters the next step after response is successful;
E. the core MCU triggers the instruction of the attached network again to try to access the network through the instruction of 'AT + CGATT ═ 1'; starting 300 seconds of delay waiting operation when the instruction response is successful;
f1, after the waiting time is finished, inquiring that the NB module is successfully accessed to the network, and executing the data transmission service by the core MCU according to the internal operation requirement.
F2, after the waiting time is finished, inquiring that the NB module still fails to access the network, and the core MCU will retry for 3 times; if the failure still occurs, the exception handling process is re-entered after 10 minutes.
The invention realizes the following innovative design:
(1) standardized construction of NB modules and design of electrical interfaces improve the adaptivity.
(2) And the NB module improves the data acquisition efficiency of the electric energy meter by means of perfect network coverage advantages.
(3) The NB module utilizes a mechanism of task list triggering processing to enable AT instructions of the NB module to be completed safely and reliably, complex instruction operations are simplified, programmers can conveniently operate the NB module during modification and debugging in the later period, and the NB module is very strong in popularization.
(4) The NB module realizes the copying and reading of the appointed data items of the matched electric energy meter by utilizing the design of the automatic uploading task list, and completely uploads the response data of the electric energy meter to the core platform, so that the communication pressure of the copying and reading instruction of the NB network is reduced while the data acquisition rate is improved, and the optimization of the network is facilitated.
(5) The design of the communication module with the '645 protocol' is convenient for the platform side to access and manage most intelligent electric energy meters on the market in China, and the butt joint efficiency of the local upgrading communication mode of the electric energy meters is improved.
Based on the same inventive concept, the present application provides another embodiment, which is described as follows.
An NB-loT-based smart meter communication method, comprising:
the method comprises the following steps that a control unit carries out communication, detection and initialization on an intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, and the NB module is configured to be added into an NB-IoT network and connected with a platform side;
the platform side sends an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the method comprises the following steps that a control unit obtains an automatic meter reading item set and meter reading parameters issued by a platform side in real time through an NB (NB) module according to a preset initialized uploading process task list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit selects one item in the automatic meter reading item set, acquires meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, constructs an uploading data frame according to the uploading data format, and reports the meter reading data to a platform side through the NB module;
the platform side receives the meter reading data;
after the control unit finishes the item, a new item is selected from the automatic table look-up item set to be finished until all items in the automatic table look-up item set are finished.
Various modifications and specific examples of the foregoing embodiments of the method are also suitable for this embodiment, and the detailed description of the method will be clear to those skilled in the art, so that the detailed description is omitted here for the sake of brevity.
Based on the same inventive concept, the present application provides another embodiment:
the utility model provides a smart electric meter communication system based on NB-loT which characterized in that, it includes platform side and smart electric meter, smart electric meter includes the control unit:
the control unit is used for communicating, detecting and initializing the intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, configuring the NB module to join an NB-IoT network and connecting a platform side;
the platform side is used for sending an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the control unit is used for acquiring an automatic meter reading item set and meter reading parameters issued by the platform side in real time through the NB module according to a preset initialized uploading flow task list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit is used for selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to the platform side through the NB module;
the platform side receives the meter reading data;
the control unit is used for selecting a new item from the automatic table look-up item set to be completed after the item is completed until all items in the automatic table look-up item set are completed.
Generally, the intelligent electric meter communication method and system based on NB-loT provided by the embodiment of the invention can intelligently collect meter reading data, and are convenient and simple to install; the communication protocol standard is unified, the acquisition efficiency is high, and the cost is low.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An NB-loT-based smart meter communication method is characterized by comprising the following steps:
according to a task sequence in a preset initialization process task execution list, carrying out communication, detection and initialization on an intelligent electric meter and an NB module thereof, configuring the NB module to enable the NB module to be added into an NB-IoT network, and connecting a platform side;
according to a preset initialized uploading flow task execution list, acquiring an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to a platform side through the NB module;
after the item is completed, a new item is selected from the set of automatic table look-up items to be completed until all items in the set of automatic table look-up items are completed.
2. The NB-loT-based smart meter communication method according to claim 1, wherein if an exception is found during task execution in an initialization process task execution list or an automatic upload process task execution list, the exception repair process task execution list is loaded.
3. The NB-loT-based smart meter communication method of claim 2, wherein the loading of the exception repair procedure task execution list comprises:
restarting the NB module;
starting the minimum function mode of the NB module;
clearing the prior frequency point of the NB module;
starting a full-function mode of the NB module;
sending a network access instruction for joining the NB-IoT network, waiting for preset response time when the network access instruction responds successfully, and confirming that the repair is completed if the NB module is queried to access the network successfully;
and if the NB module fails to access the network, reloading the abnormal repair flow task execution list, waiting for preset standby time after repeatedly loading the preset times, and reloading the abnormal repair flow task execution list.
4. The NB-loT-based smart meter communication method of claim 1, wherein the communicating, detecting and initializing the smart meter and its NB module comprises:
reporting an error when the read-write memory is abnormal;
detecting a downlink interface of the intelligent electric meter, establishing a preset instruction frame for reading the communication address, sending the instruction frame for reading the communication address to the intelligent electric meter through the downlink interface, and storing the address in a response frame of the intelligent electric meter;
initializing an NB module, and after confirming that the response is successful, configuring the NB module into a manual network access mode, and configuring network access parameters and a working mode of the NB module;
the network access parameters comprise IP addresses, port numbers and NB frequency points, and the working modes are a maximum function mode after obtaining IMEI codes of NB modules and ICCID code information of SIM, an eDRX function of the NB modules which are closed and a PSM function.
5. The NB-loT-based smart meter communication method of claim 1, wherein the configuring the NB module to join an NB-IoT network comprises:
and triggering the NB module to perform network attachment action, waiting for preset time after the NB module successfully answers, sending a query instruction, and querying the network access state of the NB module.
6. The NB-loT-based smart meter communication method of claim 1, wherein the obtaining of the meter reading data corresponding to the upload data category in the smart meter after the trigger condition is met, the creating of an upload data frame according to the upload data format, and the reporting of the meter reading data to the platform side through the NB module comprises:
and the trigger condition is an uploading time point, an uploading data frame is established according to the uploading data format, the data frame is sent to the platform side through the NB module at the uploading time point, and whether the uploading is successful or not is confirmed.
7. The NB-loT-based smart meter communication method of claim 1, wherein receiving platform-side data comprises:
extracting issued command data from a received instruction frame according to a preset data communication format, judging whether the issued command data is legal or not, and if not, discarding the issued command data;
extracting the communication address code in the issued command data, matching the communication address code with a pre-stored communication address list, and confirming an execution object;
if the execution object is an NB module, configuring the NB module according to the issued command data, and sending a response frame of the NB module to a platform side through the NB module;
and if the execution object is the intelligent electric meter, configuring the intelligent electric meter according to the issued command data, and sending a response frame of the intelligent electric meter to a platform side through the NB module.
8. The NB-loT-based smart meter communication method of claim 1, wherein the trigger condition is the end of a time period or the arrival of a set time point.
9. An NB-loT-based smart meter communication method is characterized by comprising the following steps:
the method comprises the following steps that a control unit carries out communication, detection and initialization on an intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, and the NB module is configured to be added into an NB-IoT network and connected with a platform side;
the platform side sends an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the method comprises the steps that a control unit obtains an automatic table look-up item set and meter reading parameters issued by a platform side in real time through an NB (NB) module according to a preset initialized uploading process task execution list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit selects one item in the automatic meter reading item set, acquires meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, constructs an uploading data frame according to the uploading data format, and reports the meter reading data to a platform side through the NB module;
the platform side receives the meter reading data;
after the control unit finishes the item, a new item is selected from the automatic table look-up item set to be finished until all items in the automatic table look-up item set are finished.
10. The utility model provides a smart electric meter communication system based on NB-loT which characterized in that, it includes platform side and smart electric meter, smart electric meter includes the control unit:
the control unit is used for communicating, detecting and initializing the intelligent electric meter and an NB module thereof according to a task sequence in a preset initialization process task execution list, configuring the NB module to join an NB-IoT network and connecting a platform side;
the platform side is used for sending an automatic meter reading item set and meter reading parameters to a control unit of the intelligent electric meter;
the control unit is used for acquiring an automatic table look-up item set and meter reading parameters issued by the platform side in real time through the NB module according to a preset initialized uploading process task execution list, wherein the meter reading parameters comprise an uploading data type, an uploading data format and a triggering condition;
the control unit is used for selecting one item in the automatic meter reading item set, acquiring meter reading data corresponding to the uploading data category in the intelligent electric meter after a trigger condition is met, establishing an uploading data frame according to the uploading data format, and reporting the meter reading data to the platform side through the NB module;
the platform side receives the meter reading data;
the control unit is used for selecting a new item from the automatic table look-up item set to be completed after the item is completed until all items in the automatic table look-up item set are completed.
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