WO2022105093A1

WO2022105093A1 - Mobile meter reading method based on wisun protocol

Info

Publication number: WO2022105093A1
Application number: PCT/CN2021/085519
Authority: WO
Inventors: 胡泽鑫; 李先怀
Original assignee: 珠海中慧微电子有限公司
Priority date: 2020-11-02
Filing date: 2021-04-05
Publication date: 2022-05-27
Also published as: CN112565351A; CN112565351B

Abstract

A mobile meter reading method based on a WiSUN protocol. A hand-held meter reading device is used to read electric meters in a network, and both the hand-held meter reading device and the electric meters have a WiSUN communication module. The meter reading method comprises the following steps: the hand-held meter reading device searches for electric meters within its own signal coverage, obtains communication addresses of the found electric meters and saves the communication addresses; the hand-held meter reading device establishes a point-to-point communication connection with an electric meter to be read; the hand-held meter reading device and the electric meter perform data interaction in a point-to-point communication manner to implement meter reading; and after the meter reading is completed, the hand-held meter reading device interrupts the point-to-point communication connection with the read electric meter, and continues to read the next electric meter until all the electric meters are read, and the meter reading ends. The present invention acquires, by fast searching for electric meters, related information of electric meters deployed within the signal coverage of a hand-held meter reading device, and then establishes a point-to-point communication connection with each electric meter to perform meter reading in a communication manner; and network construction is not required, improving meter reading efficiency.

Description

A Mobile Meter Reading Method Based on WiSUN Protocol

technical field

The invention belongs to the technical field of Internet of Things communication, and in particular relates to a mobile meter reading method based on Wi-SUN protocol.

Background technique

Wi-SUN (Wireless Smart Ubiquitous Network) technology is a transmission technology based on international standards such as IEEE802.15.4g and IPv6. It has the characteristics of long-distance communication, large-scale networking, and high security and scalability. It can be applied in Large-scale IoT areas such as smart meters or other utility communication devices.

When Wi-SUN technology is applied in smart meter reading, the Wi-SUN FAN specification is generally adopted. The FAN network is a master-slave architecture, that is, each subnet has a master node (Border Router) and several sub-nodes (Router or Leaf Node). Each child node registers with the master node to join the network, and finally forms a tree-shaped network with the master node as the root node. The characteristics of Wi-SUN FAN network make it especially suitable for intelligent meter reading systems deployed in fixed locations. There are some shortcomings when using handheld meter reading devices for mobile meter reading. For example, when a handheld meter reading device is used for mobile meter reading, if the handheld meter reading device joins the network as a sub-node and transfers the messages through the master node to perform meter reading, first of all, it takes a long time for the handheld meter reading device to access the network, and it will take a long time. It affects the efficiency of meter reading. Secondly, when the handheld meter reading device is moved, the network topology will change. It may be necessary to re-select the parent node to connect to the network. In severe cases, the network topology may even be oscillated. If the meter node is not connected to the network, or the network itself is unstable, The success rate of meter reading will be affected. However, if the handheld meter reading device performs meter reading as the master node, it will take a long time to network when the number of nodes in the network is large. For example, when the number of nodes in the network exceeds 100, network networking may require Ten minutes greatly affects the mobility of the handheld meter reading device; and when the handheld meter reading device moves, the network topology will continue to change and cannot reach a stable state, thereby affecting the success rate of reading.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a mobile meter reading method based on the Wi-SUN protocol that can realize fast meter reading.

In order to achieve the above object, the present invention adopts the following technical solutions:

A mobile meter reading method based on the WiSUN protocol, using a handheld meter reading device to perform meter reading on an electric meter in a network, the handheld meter reading device and the electric meter both have a WiSUN communication module, and the meter reading method comprises the following steps:

S1. Search for electric meters; the handheld meter reading device searches for electric meters within its own signal coverage, obtains the communication address of the discovered electric meters and saves them;

S2. Establish a connection; the handheld meter reading device establishes a point-to-point communication connection with the meter to be read;

S3, communication meter reading; hand-held meter reading equipment and electricity meter exchange data through point-to-point communication to realize meter reading;

S4. Disconnect; after the meter reading is completed, the handheld meter reading device disconnects the point-to-point communication connection from the meter that has completed the meter reading, and continues to read the next meter until all the meters are read, and the meter reading is ended.

Further, in step S1, when the handheld meter reading device searches for an electric meter, it broadcasts and sends a PA frame on all available channels. After receiving the PA frame sent by the handheld device, it broadcasts and sends the PAS frame on all available channels. After the handheld meter reading device receives the PAS frame sent by the electric meter, it obtains and saves the information of the electric meter.

Further, the specific field information is included in the reserved field of the PA frame, or included in the VH-IE field carried in the PA frame.

Further, in step S2, the handheld meter reading device sends an application for establishing a point-to-point communication connection to the meter to be read, and after receiving the application, the meter replies to the handheld meter reading device a data frame containing the agreed information for establishing a point-to-point communication connection, indicating The point-to-point communication connection is established successfully.

Further, the handheld meter reading device sends a data frame containing VP-IE to the meter to be read, and applies for establishing a point-to-point communication connection with the meter. The information field of the VP-IE contains the contract information for applying to the meter for establishing a point-to-point communication connection. , after the meter receives the data frame applying for establishing point-to-point communication and parses the information fields in the VP-IE, it replies to the handheld meter reading device the data frame of the VP-IE containing the agreed information field, indicating that the point-to-point communication connection is successfully established.

Furthermore, the handheld meter reading device and the electric meter use frequency hopping to establish point-to-point communication, and/or the handheld meter reading device and the electric meter use frequency hopping for point-to-point communication.

Further, in step S3, the interactive data content between the handheld meter reading device and the electric meter includes meter reading, parameter query and parameter configuration.

Further, in step S3, the packet encapsulation format of the data exchanged between the handheld meter reading device and the electric meter is the Wi-SUN protocol MAC layer data frame format, UDP frame format or ICMP frame format.

Further, in step S4, the handheld meter reading device broadcasts the data frame containing the VP-IE to the electric meter that has completed the meter reading, and the VP-IE contains the agreed information for indicating disconnection, and the electric meter receives the data frame and After parsing, reply the data frame containing VP-IE to the handheld meter reading device, indicating that the current communication connection has been disconnected and will no longer respond to point-to-point communication messages. After the handheld meter reading device receives the data frame replied by the meter, it releases the current The resources occupied by the communication connection are waiting for the next round of meter reading operation.

It can be seen from the above technical solutions that the mobile meter reading method of the present invention is based on the Wi-SUN communication protocol, and the Wi-SUN communication protocol is used between the handheld meter reading device and the electricity meter. Establish a unicast point-to-point communication connection with the meter to be read, and then complete meter reading or other upper-level business processes through message exchange in point-to-point communication. After the meter is read, the handheld meter reading device ends with the meter communication module. When the communication is connected, the communication module of the electric meter resumes the networking communication mode, and the handset enters the next round of link building and meter reading process or the meter reading ends. The mobile meter reading method of the present invention does not require networking, and can quickly establish a communication connection and realize communication interaction through a point-to-point communication mode, so as to realize the reading of a single electric meter. Affects the networking communication function between the Wi-SUN sub-node and its master node.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Figure 1 is a flow chart of the method of the present invention.

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious, the following specific embodiments of the present invention are given and described in detail as follows in conjunction with the accompanying drawings.

The mobile meter reading method of the present invention is based on the Wi-SUN communication technology. Both the handheld meter reading device and the meter end are provided with a Wi-SUN communication module, and communication interaction can be performed through the Wi-SUN communication module. The mobile meter reading method includes the following steps:

S1. Search for electric meters; the handheld meter reading device searches for electric meters deployed within the coverage of its own wireless signal, obtains information such as the communication address of the electric meter, frequency hopping channel plan, etc., and saves the information of all the electric meters found for subsequent copying. table use;

When searching the meter, the handheld meter reading device broadcasts and sends PA frames (broadcast frames) on all available channels. After the meter receives the PA frames sent by the handheld device through its own Wi-SUN communication module, it broadcasts and sends PAS on all available channels. Frame (broadcast request frame), PA frame and PAS frame are different types of frames in the Wi-SUN protocol standard. After the handheld meter reading device receives the PAS frame sent by the electric meter, it can obtain the relevant information of the electric meter.

As a specific embodiment of the present invention, when searching for electricity meters, the handheld meter reading device uses the MLME-WS-ASYNC-FRME mechanism to broadcast and send PA frames, that is, it traverses all the channels specified in the ChannelList, and sends the data on each channel. PA frame. In the PA frame sent by the handheld meter reading device, in addition to the conventional UTT-IE, US-IE, PAN-IE, NETNAME-IE and other field information, it is used to indicate the frame type of this frame and the information of the node sending this frame. In addition to information such as time slot interval, channel plan, channel function, clock accuracy, routing method, path cost, network name, etc., it also contains specific field information used to indicate that this PA frame is used for hand-held meter reading equipment to search for tables. The information can be filled in the reserved field of the PA frame (for example, the 7th bit of the frame control field of the PA frame is a reserved bit, and 1 in this position can be set to indicate that the PA frame is used for the hand-held meter reading device to search the table), or The VH-IE field is carried in the PA frame, and a certain frame format is set in the VH-IE field to represent the search table used by this PA frame for the handheld meter reading device.

After all the meters within the signal coverage of the handheld meter reading device receive the PA frame containing the information for fast meter search, the MLME-WS-ASYNC-FRME mechanism is also used to send the PAS frame. After the handheld meter reading device receives the PAS frame from the meter, it can obtain the relevant information of the Wi-SUN communication module on the meter side, including MAC address, time slot interval, channel plan, channel function, clock accuracy, etc. The meter device records and saves the received information about each meter for use in the next communication meter reading.

S2. Establish a connection; establish a point-to-point communication connection between the handheld meter reading device and the meter;

The handheld meter reading device sends a data frame containing VP-IE to the specified meter (the meter to be read), and applies for establishing a point-to-point communication connection with the meter. The information field of VP-IE contains the agreement to apply to the meter for establishing a point-to-point communication connection After the meter receives the data frame applying for establishing point-to-point communication and parses the information fields in the VP-IE, it replies to the handheld meter reading device a VP-IE data frame containing the agreed information field, indicating that the point-to-point communication connection is successfully established.

In the process of searching the table in step S1, the handheld meter reading device and the electric meter exchange information through information exchange, and both obtain the MAC address (communication address), frequency hopping plan and other information of both parties. Therefore, in order to improve transmission efficiency and reduce wireless channel conflicts , the handheld meter reading device and the meter can establish point-to-point communication by means of frequency hopping.

S3, communication meter reading; after the point-to-point communication connection between the handheld meter reading device and the electric meter is established, the handheld meter reading device can complete the meter reading communication with the electric meter through the interaction of point-to-point data frames.

During meter reading, the hand-held meter reading device and the electric meter can use frequency hopping for communication and interaction. The load of communication interaction includes meter reading, parameter query, parameter configuration and so on. The packet encapsulation format may be the Wi-SUN protocol MAC layer data frame format, or may be further encapsulated UDP frame, ICMP frame and other frame formats.

S4. Disconnect; after the meter reading is completed, the handheld meter reading device disconnects the point-to-point communication link from the meter that has completed the meter reading, so that the handheld meter reading device can continue to read the next meter until all the meters are read. End meter reading.

As a specific embodiment of the present invention, the handheld meter reading device unicasts a data frame containing VP-IE to a specified meter, instructing to disconnect the point-to-point communication connection between the two parties. The VP-IE contains contract information for indicating disconnection. After the meter receives the data frame and parses out the information fields in the VP-IE, it replies to the handheld meter reading device with a data frame containing VP-IE, indicating that the current communication connection has been disconnected and no longer responds to point-to-point communication messages; After the meter reading device receives the data frame replied by the meter, it releases the resources occupied by this communication connection and waits for the next round of operation.

The invention overcomes the long network time-consuming, unconnected node unable to read the meter, poor mobility of the handset, and mobile When the parent node needs to be replaced and re-connected to the network, the relevant information of the electric meters deployed within the signal coverage of the handheld meter reading device can be obtained through a quick meter search, and then a point-to-point communication connection is established with each electric meter to perform communication meter reading without networking. , the meter reading efficiency is improved, and the method of the invention is carried out under the framework of the Wi-SUN protocol, which will not affect the interconnectivity of the Wi-SUN module communication.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A mobile meter reading method based on the WiSUN protocol, using hand-held meter reading equipment to read the electricity meter in the network, the handheld meter reading equipment and the electricity meter both have a WiSUN communication module, and it is characterized in that, the meter reading method comprises the following steps:

S1. Search for electric meters; the handheld meter reading device searches for electric meters within its own signal coverage, obtains the communication address of the discovered electric meters and saves them;

S2. Establish a connection; the handheld meter reading device establishes a point-to-point communication connection with the meter to be read;

S3, communication meter reading; hand-held meter reading equipment and electricity meter exchange data through point-to-point communication to realize meter reading;

S4. Disconnect; after the meter reading is completed, the handheld meter reading device disconnects the point-to-point communication connection from the meter that has completed the meter reading, and continues to read the next meter until all the meters are read, and the meter reading is ended.
The mobile meter reading method based on the WiSUN protocol as claimed in claim 1, characterized in that: in step S1, when the handheld meter reading device searches for an electric meter, it broadcasts and transmits a PA frame on all available channels, and the PA frame contains a message for indicating this The PA frame is the specific field information used for the handheld meter reading device to search for the meter. After the meter receives the PA frame sent by the handheld device, it broadcasts and sends the PAS frame on all available channels. After the handheld meter reading device receives the PAS frame sent by the meter, it obtains information of the electricity meter and save it.
The mobile meter reading method based on the WiSUN protocol according to claim 2, wherein the specific field information is included in the reserved field of the PA frame, or included in the VH-IE field carried in the PA frame.
The mobile meter reading method based on the WiSUN protocol according to claim 1 is characterized in that: in step S2, the handheld meter reading device sends an application for establishing a point-to-point communication connection to the electricity meter to be read. The meter reading device replies with a data frame containing the agreed information for establishing a point-to-point communication connection, indicating that the point-to-point communication connection is successfully established.
The mobile meter reading method based on the WiSUN protocol according to claim 4 is characterized in that: the handheld meter reading device sends a data frame containing VP-IE to the meter to be read, and applies for establishing a point-to-point communication connection with the meter, and the VP-IE The information field contains the contract information for applying to the meter to establish a point-to-point communication connection. After the meter receives the data frame applying for establishing a point-to-point communication and parses the information field in the VP-IE, it will reply to the handheld meter reading device with the contract information field. The data frame of VP-IE, indicating that the point-to-point communication connection is established successfully.
The mobile meter reading method based on the WiSUN protocol according to claim 1 is characterized in that: the handheld meter reading device and the electricity meter use a frequency hopping method to establish point-to-point communication, and/or the handheld meter reading device and the electricity meter use a frequency hopping method to perform Peer-to-peer communication.
The WiSUN protocol-based mobile meter reading method according to claim 1 is characterized in that: in step S3, the interactive data content between the handheld meter reading device and the electric meter includes meter reading, parameter query and parameter configuration.
The mobile meter reading method based on the WiSUN protocol according to claim 1 is characterized in that: in step S3, the message encapsulation format of the interactive data between the handheld meter reading device and the electric meter is the Wi-SUN protocol MAC layer data frame format or UDP frame format or ICMP frame format.
The mobile meter reading method based on the WiSUN protocol according to claim 1, characterized in that: in step S4, the handheld meter reading device broadcasts a data frame containing VP-IE to the electric meter that has completed meter reading, and the VP-IE contains The contract information used to indicate disconnection. After the meter receives the data frame and parses it, it replies to the handheld meter reading device with a data frame containing VP-IE, indicating that the current communication connection has been disconnected and will no longer respond to point-to-point communication messages. , after the handheld meter reading device receives the data frame replied by the meter, it releases the resources occupied by this communication connection and waits for the next round of meter reading operation.