WO2016026347A1

WO2016026347A1 - Micropower wireless network self-networking method and micropower wireless network

Info

Publication number: WO2016026347A1
Application number: PCT/CN2015/081860
Authority: WO
Inventors: 赵东艳; 乔丰; 顾翔; 张宇; 楼珊珊
Original assignee: 国家电网公司; 北京南瑞智芯微电子科技有限公司
Priority date: 2014-08-20
Filing date: 2015-06-18
Publication date: 2016-02-25
Also published as: CN105451290A; CN105451290B

Abstract

Disclosed are a micropower wireless network self-networking method and a micropower wireless network. The method comprises: initiating, by a master node, a broadcast networking command hop by hop in a common channel group, and exchanging data with a child node in a private channel group; after the master node receives a networking beacon sent by a concentrator, acquiring a node identifier and the time cost of the master node transmitting a message to a child node within a one hop range thereof, and meanwhile performing channel scanning and field intensity collection; and scanning, by the master node, pre-set serial numbers to judge whether the serial numbers are in conflict, and when the serial numbers are not in conflict, networking succeeding. According to the method, by means of automatic switching channel scanning and field intensity collection, the time cost of arriving at each child node is acquired; and the achieving of rapid self-networking is considered comprehensively by collecting and calculating a variety of data, which increases the efficiency of networking to a large extent, and can save networking time and improve the stability of network communication.

Description

Micropower wireless network ad hoc network method and micro power wireless network

Technical field

The present invention relates to the field of micro power wireless network technologies, and in particular, to a micro power wireless network ad hoc network method and a micro power wireless network.

Background technique

With the expansion of the construction of low-voltage power grids, the number of independent energy meters has increased. The traditional manual meter reading method consumes a lot of manpower, and the accuracy and real-time performance are not guaranteed. The large-scale power line carrier communication meter reading method is used on the spot. The reliability of communication is also facing enormous challenges due to noise interference and poor line quality. Meter reading by micro-power wireless communication technology provides a better solution for low-voltage collection, but point-to-point, point-to-multipoint micro-power wireless routing and networking methods, low efficiency, poor reliability, etc. A micro-power wireless ad hoc network method based on automatic frequency hopping mechanism is needed. Frequency hopping is one of the most commonly used spreading methods. The system divides the entire frequency band into several sub-bands, and different communication links use different sub-bands for communication. The meter reading requirements for efficient networking efficiency and spectrum resource sharing can also effectively prevent interference between the same communication network.

The existing micro-power wireless ad hoc network method has low networking efficiency, which causes waste of spectrum resources, interferes with the normal operation of other devices, is not mature in networking technology, lacks a link control mechanism, and cannot request network access to abnormal nodes. Achieving good control will cause interference to the networking of the entire network.

Summary of the invention

The present invention is to overcome the shortcomings of the low efficiency of the micro power wireless ad hoc network method in the prior art. According to an aspect of the present invention, a micro power wireless network ad hoc network method is proposed.

The method for the self-organizing network of the micro-power wireless network provided by the embodiment of the present invention includes: the master node initiates a broadcast network command hop by hop in the common channel group, performs data interaction with the child node in the private channel group, and notifies the children of different levels at the same time. The node packet forwards the broadcast networking command; after receiving the network beacon sent by the concentrator, the master node acquires the node identifier, the time cost of the primary node transmitting the message to the 1-hop range child node, and simultaneously performs channel scanning and field strength collection; During the predetermined time, the master node waits for the child node to report data, collects and stores the topology data of all the child nodes, according to the concentrator Set the requirements, combine the field strength information, calculate and store the time cost, and dynamically organize the network; the topology data includes the identifiers of all the child nodes, the time cost of the center node to the child nodes, and the field strength information; the master node scans the preset number If there is a conflict between the numbers, the master node randomly generates a number, and then judges whether the numbers are in conflict. When the number does not conflict, the networking succeeds.

In the foregoing technical solution, before the primary node initiates the broadcast networking command step by hop in the common channel group, the method further includes: initializing the primary node; initializing the primary node includes: initializing the address, the network number, and the multiple channels of the primary node.

In the foregoing technical solution, the time cost is calculated and stored in combination with the field strength information, including: sorting the topology data of the same-level child node according to the size of the time cost of the primary node transmitting the message to the one-hop range child node, and storing Data; the stored data is the node identifier, the time cost of the primary node transmitting the message to the child node, and the correspondence between the node identifier and the time cost of the primary node transmitting the message to the child node.

In the foregoing technical solution, the method further includes: a step of accessing the network by the child node, and the step of accessing the network of the child node includes: submitting the network entry request to the child node to be accessed, the child node applying for the network entry carries the topology information; and the access node of the upper node is the network access request of the child node. Forwarding to the master node; after receiving the network access confirmation information sent by the master node, obtaining the time cost of the primary node transmitting the message to the child node and the level at which the leaf node is located; determining whether to allow the incoming child node to enter the network; allowing the incoming child node to access the network At this time, the network address is assigned to the child node to be connected, and the network information is agreed to be returned.

In the foregoing technical solution, the step of accessing the network by the child node further includes: when the child node cannot receive the network data, the child node cyclically switches the channel in one of the multiple receiving channels; when the node switches to a receiving channel, starts the timer, if If no signal is detected within a period of time, it switches to the next receiving channel; if a signal is detected within a period of time, the timer is incremented for a fixed period of time.

In the above technical solution, the common channel and the private channel have multiple frequency points, and each forms a channel group; when communication is required, a frequency point with a relatively high signal-to-noise ratio is selected as a priority working frequency point in each group.

The present invention is to overcome the drawbacks of low efficiency of the micro power wireless networking in the prior art. According to an aspect of the present invention, a micro power wireless network is proposed.

A micro power wireless network provided by an embodiment of the present invention includes: a master node and a child node;

The master node is configured to initiate a broadcast networking command hop by hop in the common channel group, perform data interaction with the child node in the private channel group, and notify the child nodes of different levels to forward the broadcast networking command;

After receiving the network beacon sent by the concentrator, the master node obtains the node identifier, the time cost of the primary node transmitting the message to its 1-hop range child node, and simultaneously performs channel scanning and field strength collection;

During the predetermined time, the master node waits for the child node to report data, collects and stores the topology data of all the child nodes, calculates and stores the time cost according to the configuration requirements of the concentrator, and combines the field strength information to dynamically perform networking; the topology data includes all The identifier of the child node, the time cost of the center node to the child node, and the field strength information;

The master node scans the preset number to determine whether there is a conflict in the number. When the number conflicts, the master node randomly generates a number, and then determines whether the number conflicts. When the number does not conflict, the networking succeeds.

The child node is used to forward the broadcast network command and report the topology data to the master node within a preset time.

In the above technical solution, the master node further performs the step of initializing the master node before the step of the common channel group hop-by-hop to initiate the broadcast networking command; initializing the master node includes: initializing the address, the network number, and the plurality of channels to the master node.

In the foregoing technical solution, when the child node is a child node to be connected to the network, the child node is further configured to: the child node to be added to the network submits an application for accessing the network, and the child node that applies for network access carries the topology information; and the child node enters the network at the upper level node. After requesting forwarding to the primary node, receiving the network access confirmation information sent by the primary node, and obtaining the time cost of the primary node transmitting the message to the child node and the level at which the leaf node is located; determining whether the network node to be accessed is allowed to enter the network; When accessing the network, assign a network address to the child nodes to be connected to the network, and return to the network access information.

In the foregoing technical solution, the child node is further configured to: when the child node cannot receive the network data, the child node cyclically switches the channel in the multiple receiving channels; when the node switches to a receiving channel, start the timer, if in a If no signal is detected within the time period, switch to the next Receive channels; if a signal can be detected for a period of time, the timer is incremented for a fixed period of time.

The micro-power wireless network ad hoc network method and the micro-power wireless network provided by the embodiments of the present invention automatically collect channel time and field strength collection to obtain the time cost of reaching each sub-node, and collect and calculate through various aspects of data. To comprehensively consider the implementation of fast ad hoc networks, the efficiency of networking is greatly improved, network networking time can be saved, and the stability of network communication can be improved.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention may be realized and obtained by means of the structure particularly pointed in the appended claims.

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a In the drawing:

1 is a flowchart of a method for a micro power wireless network ad hoc network according to an embodiment of the present invention;

2 is a flowchart of a sub-node of a micro-power wireless network in the embodiment of the present invention;

3 is a flow chart of interaction between a micro power wireless network sub-node applying for network access according to an embodiment of the present invention;

4 is a topological structural diagram of a micro power wireless network according to an embodiment of the present invention.

detailed description

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it is understood that the scope of the present invention is not limited by the specific embodiments.

The micro-power wireless network self-organizing network system provided in the embodiment of the present invention is a self-organized MESH (Wireless Grid Network) network structure characteristic wireless network system, which is used for constructing an electric meter in an automatic collection power automation system. Information network. By concentrator, data acquisition equipment, The wireless network system and the like are composed; wherein the data collection device is responsible for information collection, and the concentrator is responsible for collecting data of the data collection device, and the wireless network system is composed of a primary node and a child node. The master node is the center of the entire network, which is responsible for establishing, maintaining, and managing the network; the child nodes actively search for network joins. The wireless network system is responsible for the transparent transmission of data from the concentrator or data acquisition device. In general, the primary node is located in the concentrator and the child nodes are located in the data collection device.

According to an embodiment of the present invention, a method for a micro-power wireless network ad hoc network is provided, and FIG. 1 is a flowchart of the method, which specifically includes:

Step 101: The master node initiates a broadcast networking command in a common channel group hop by hop, performs data interaction with the child node in the private channel group, and notifies the child nodes of different levels to forward the broadcast networking command.

Wherein, before step 101, the step of initializing the master node is further included, and the step may be after the step of powering up the concentrator. Initializing the master node specifically includes: allocating an address, a network number, and initializing a plurality of channels to the master node.

Specifically, the master node traverses the sub-nodes of the entire network by sending the broadcast network command frames of different levels at the same time. For the nodes that have entered the network, only the networking commands are forwarded.

Step 102: After receiving the network beacon sent by the concentrator, the master node acquires the node identifier, the time cost of the primary node transmitting the message to the sub-node of the 1-hop range, and performs channel scanning and field strength collection.

Step 103: The master node waits for the child node to report data, collects and stores the topology data of all the child nodes, and calculates and stores the time cost according to the configuration requirements of the concentrator according to the configuration requirements of the concentrator, and dynamically performs networking; The data includes the identity of all child nodes, the time cost of the central node to the child nodes, and the field strength information.

In the embodiment of the present invention, the central node is the primary node, the time cost is the time overhead from the primary node to the direct lower-level child node, the channel scan is to scan the specified channel group, and the channel with less interference is selected, and the field strength collection is valid. In the signal frame, the field strength information is extracted and stored.

The combining the field strength information in step 103, calculating and storing the time cost includes: sorting the topology data of the sibling sub-node according to the size of the time cost of the primary node transmitting the message to the sub-node of the 1-hop range, and storing Data; the stored data is the node identifier, the time cost of the primary node transmitting the message to the child node, and the correspondence between the node identifier and the time cost of the primary node transmitting the message to the child node.

Step 104: The master node scans the preset number to determine whether there is a conflict in the number. If the number conflicts, proceed to step 105; otherwise, continue to step 106.

Step 105: The master node randomly generates a number, and then proceeds to step 104.

Step 106: The networking is successful.

The common channel and the private channel have multiple frequency points, and each form a channel group; when communication is required, a frequency point with a higher signal-to-noise ratio (SNR) is selected as the priority working frequency point in each group. .

Specifically, the channels in the network are allocated into groups of s, wherein each group is further divided into n channels, and the master node acquires n channels in one of the groups. In the automatic networking, two or more channels are selected from the n channels and the network access information is allowed to be sent to the child nodes. After receiving the information, the child nodes perform networking and set the receiving channel to multiple channels. Where s>n, n≥2, and n is an integer multiple of 2.

Preferably, the method further includes a step of joining the child node, and the step of joining the child node includes:

Step A1: The child node to be added to the network submits an application for accessing the network, and the child node that applies for network access carries topology information.

Step A2: The upper-level node forwards the network access request of the child node to the primary node.

Step A3: After receiving the network access confirmation information sent by the primary node, obtain a time cost of the primary node transmitting the message to the child node and a level at which the leaf node is located;

In step A4, it is determined whether the network node to be accessed is allowed to enter the network. When the child node to be connected to the network is allowed to access the network, the network address of the child node to be connected is allocated, and the network access information is returned. If not allowed, the application information is discarded and the network access information is rejected.

In addition, when the child node cannot receive the network data, the child node cyclically switches the channel in multiple receiving channels; when the node switches to a receiving channel, the timer is started, and if no signal is detected within a time period, then Switch to the next receive channel; if a signal can be detected for a period of time, the timer is incremented for a fixed amount of time.

Since detecting a signal in a channel wastes a certain amount of time, and detecting a signal indicating that data needs to be processed, in order to have time to process data on the channel, it is necessary to add the timer for a fixed period of time.

Preferably, in the process of self-organizing, the specific steps of communication between adjacent nodes include:

Step B1: Query whether the source node has a record of a successful communication channel with the destination node, if any Record, continue to step B2, otherwise continue to step B3;

Step B2: The source node jumps to the recorded channel to communicate with the destination node;

Step B3: The source node jumps to a receiving channel of the destination node, and then sends a data packet to the destination node, starts a timer, and waits for an acknowledgement packet on the current channel;

Step B4: If the confirmation packet is received, the communication is successful, the source node switches back to its own receiving channel, and records the correspondence between the source node and the destination node communication channel.

Step B5: If the acknowledgement packet is not received, the source node jumps to the channel of the destination node that has not attempted to communicate, and performs trial communication again. If all channels have tried to communicate multiple times, the communication fails, the source fails. The node switches back to its own receiving channel.

Specifically, the path selection mechanism of the networking method is: when the primary node or the child node that has entered the network receives the beacon request, and replies to a beacon including the routing cost, and the calculation of the routing cost takes into account the RSSI (Received Signal Strength) Indication, received signal strength indication) value, according to the range and threshold of the RSSI value of the communication effective, calculate the routing cost, the more the number of communication between nodes, the greater the routing cost between them, that is The sum of the routing costs between each hop. After calculating the routing cost between each parent node and the child node, the child node selects the node as the superior node of the node according to the principle of the minimum routing cost.

The micro-power wireless network self-organizing network method provided by the embodiment of the invention automatically recovers the time cost of reaching each sub-node by automatically switching channel scanning and field strength collection, and collects and calculates through various aspects of data to comprehensively realize fast implementation. The self-organizing network greatly improves the efficiency of networking, saves networking time, and improves the stability of network communication.

The process of the micro-power wireless network ad hoc network method is described in detail below.

After the concentrator works, send the beacon of the network. Before the work, configure the physical address of the primary node, configure the physical address of the data collection device to be connected to the network, and then start creating the network. After receiving the network command, the master node selects n channels with small interference among the candidate multiple channels through channel energy scanning. After that, the master node performs an active scan to determine whether there is a conflict between the preset network numbers. If there is a conflict, the master node randomly generates a network number and then judges; if there is no conflict, the network is successfully established.

For the situation where the distance between the concentrators is close to each other, the same frequency interference may occur. When the network needs to be created, different channel groups should be selected, and the data collection device and the concentrator work together to complete the network. The formation of the work.

The concentrator sends a network beacon, and the network beacon is first sent to the child node within one hop range, and the child node receiving the beacon needs to continue forwarding the information, so that all the child nodes of the MESH network can receive To the information, the field strength information of the adjacent nodes can also be received, and the field strength information includes related information such as the ID, address and signal strength of the child node, and then the related information is fed back to the concentrator and the master node by means of multi-hop.

After the concentrator sends the network beacon, the field strength collection command is sent in the time slot to collect the field strength information. The command of the field strength information can be forwarded in the sub-nodes of each level by means of automatic frequency hopping. After the data acquisition device and the child node receive the instruction, the field strength information is forwarded to the concentrator through the wireless child node module, and after receiving the information, the concentrator establishes a corresponding field strength information database. During the networking process, the field strength information of the database needs to be analyzed to calculate a better communication path.

After the data collection device is powered on, the sub-node or the master node that has entered the network is searched, and the fixed address of the child node is determined first, and the channel scan is performed, that is, the beacon is respectively sent in multiple channels of the set multiple channel groups. After the network node or the master node receives the beacon request, it responds to the beacon to notify the child nodes of the network to be in the network access state, and the child nodes to be connected to the network collect the beacons received on each channel. When all the channels have been scanned, the scanning ends. Based on the nodes that have entered the network, the sub-nodes of the network to be accessed are routed to the path of the primary node through the networked nodes, and the node with the smallest network path is selected as the node. The parent node, requesting to join the network, apply to join the network. After receiving the network access request from the slave node selected as the upper-level node, the fixed address of the child node to be connected to the network is sent to the master node. After receiving the information of the child node to be connected to the network, if the authentication succeeds, the information of the point is recorded, an incoming network address is assigned, and the network access information is returned; otherwise, the information is not recorded, and the network access information is rejected. After receiving the information of the master node, if the child node that is waiting for the network joins the network, it will join the network and start normal work. If you do not agree to the network, restart the network access process until you join the network. For details, the flow of the child nodes entering the network and the interaction process of applying for the network access are shown in FIG. 2 and FIG. 3 .

When the node performs networking, when the network data cannot be received, the child node sequentially switches the received signals of each channel in multiple receiving channels. If it is the last channel, it switches to the first channel, and cyclically switches. When the node switches to a receiving channel, the timer is started. If the node can detect the presence of a signal within a certain period of time, the timer will be added for a fixed time. If no signal is detected, the switch will switch to the next receiving. channel.

In the case of an unconnected node, or a new data collection node needs to join, these nodes need to actively apply for access to the network, initiate a network access request in each channel group, receive information on the private channel, scan the received response, and if there is a response, The field strength information of the responding node is recorded. When the response time slot is completed, all the received field strength information is calculated and sorted, an optimal path is selected, and the primary node is set to set a route. If the response message is not received, the respective channels are sequentially switched to send the network access request until all channels are sent.

When the primary node does not receive the response from the child node continuously, and the communication is interrupted, the path needs to be repaired. The master node broadcasts the lookup child node. After receiving the broadcast of the node, the child node judges the information. If the node that the master node searches for is the node, it makes a response to the master node. Otherwise, the routing cost and the field in the data packet are passed. Strong information value, calculate the cost of routing to the master node, waiting for a period of time. During the waiting time, if the child node receives a new node to find the broadcast, it still calculates its routing cost and compares it with the existing routing cost. If it is larger than the existing cost, the packet is discarded. If it is less than the existing routing cost, then Replace the old packet with a new one.

The method flow of the micro-power wireless network ad hoc network method is described in detail above, and the method can also be implemented by a corresponding device. The structure and function of the device are described in detail below.

A micro power wireless network provided by an embodiment of the present invention, as shown in FIG. 4, includes: a primary node and a child node.

Specifically, the master node is configured to initiate a broadcast network command hop by hop in the common channel group, perform data interaction with the child node in the private channel group, and notify the child nodes of different levels to forward the broadcast networking command; the master node receives the concentrator. After the network beacon is sent, the node identifier and the time cost of the primary node transmitting the message to the 1-hop range sub-node are acquired, and the channel scan and the field strength collection are performed simultaneously; the master node waits for the child node to report the data and collects the data within a predetermined time. And storing the topology data of all the child nodes, calculating and storing the time cost according to the configuration requirements of the concentrator, combining the field strength information, and dynamically performing networking; the topology data includes the identifiers of all the child nodes, the time cost of the central node to the child nodes, Field strength information; the master node scans the preset number to determine whether there is a conflict in the number. When the number conflicts, the master node randomly generates a number, and then determines whether the number conflicts. When the number does not conflict, the networking succeeds.

Preferably, the master node further performs before the common channel group initiates the broadcast networking command step by hop. The step of initializing the master node; initializing the master node includes: initializing the address, network number, and multiple channels of the master node.

Preferably, combining the field strength information, calculating and storing the time cost comprises: sorting the topology data of the same-level child node according to the size of the time cost of the primary node transmitting the message to the child node of the 1-hop range, and storing the data; storing The data is the node identifier, the time cost of the primary node transmitting the message to the child node, and the correspondence between the node identifier and the time cost of the primary node transmitting the message to the child node.

Preferably, when the child node is a child node to be connected to the network, the child node is further configured to: the child node to be submitted to the network submits the network application, and the child node that applies for the network carries the topology information; and the node accesses the network access request of the child node to the upper node. After the master node receives the network access confirmation information sent by the master node, and obtains the time cost of the primary node transmitting the message to the child node and the level at which the leaf node is located; determining whether to allow the network node to be connected to the network to enter the network; Assign a network address to the child nodes to be connected, and return to the network access information.

Preferably, the child node is further configured to: when the child node cannot receive the network data, the child node cyclically switches the channel in one of the multiple receiving channels; when the node switches to a receiving channel, start the timer if it is within a time period If no signal is detected, it switches to the next receiving channel; if a signal can be detected for a period of time, the timer is added for a fixed time.

Preferably, the common channel and the private channel have multiple frequency points, and each forms a channel group; when communication is required, a frequency point with a relatively high signal-to-noise ratio is selected as a priority working frequency point in each group.

The present invention can be embodied in a variety of different forms, and the technical solutions of the present invention are illustrated by taking the figures of FIG. 1 to FIG. 4 as an example, which does not mean that the specific examples applied to the present invention can be limited to In a particular process or embodiment structure, one of ordinary skill in the art will appreciate that the specific embodiments provided above are only a few examples of various preferred uses, and any embodiment embodying the claims of the present invention should be in the present invention. Within the scope of the technical solution.

It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, although the present invention has been described in detail with reference to the foregoing embodiments, Modifications may be made to the technical solutions described in the foregoing embodiments, or some of the technical features may be equivalently replaced. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A micro power wireless network ad hoc network method, comprising:

The master node initiates a broadcast networking command hop by hop in the common channel group, performs data interaction with the child node in the private channel group, and notifies the child nodes of different levels to forward the broadcast networking command;

After receiving the network beacon sent by the concentrator, the master node obtains the node identifier, the time cost of the primary node transmitting the message to its 1-hop range child node, and simultaneously performs channel scanning and field strength collection;

The master node waits for the child node to report data, collects and stores the topology data of all the child nodes, calculates and stores the time cost according to the configuration requirements of the concentrator, and dynamically stores the network; the topology data Including the identity of all child nodes, the time cost of the central node to the child node, and the field strength information;

The master node scans the preset number to determine whether there is a conflict in the number. When the number conflicts, the master node randomly generates a number, and then determines whether the number conflicts. When the number does not conflict, the networking succeeds.
The method according to claim 1, wherein before the step of the primary network in the common channel group hop-by-hop to initiate the broadcast networking command, the method further includes:

Initializing the primary node; the initializing the primary node includes: allocating an address, a network number, and initializing a plurality of channels to the primary node.
The method according to claim 1, wherein the combining the field strength information, calculating and storing the time cost comprises:

According to the time cost of the primary node transmitting the message to the child node of the 1-hop range, sorting the topology data of the child node of the same level, and storing the data;

The stored data is a node identifier, a time cost of the primary node transmitting the message to the child node, and a correspondence between the node identifier and a time cost of the primary node transmitting the message to the child node.
The method according to any one of claims 1-3, further comprising: a step of joining a child node into the network, the step of accessing the network of the child node comprises:

The sub-nodes that are to be added to the network submit the network application, and the sub-nodes that apply for the network carry the topology information.

The upper node forwards the network access request of the child node to the primary node;

After receiving the network access confirmation message sent by the master node, acquiring the master node to transmit the message to the child node Time cost and the level at which the leaf node is located;

It is determined whether the network node to be accessed is allowed to enter the network. When the child node to be connected to the network is allowed to access the network, the network address is assigned to the child node to be accessed, and the network access information is returned.
The method according to claim 4, wherein the step of accessing the sub-node further comprises:

When the child node cannot receive the network data, the child node cyclically switches the channel in multiple receiving channels; when the node switches to a receiving channel, the timer is started, and if no signal is detected within a time period, the switch is switched to The next receive channel; if a signal can be detected for a period of time, the timer is incremented for a fixed period of time.
The method according to claim 1, wherein the common channel and the private channel have a plurality of frequency points, and each forms a channel group; when communication is required, a frequency point with a relatively high signal-to-noise ratio is selected in each group. As a priority frequency of work.
A micro power wireless network, comprising: a master node and a child node;

The master node is configured to initiate a broadcast networking command hop by hop in the common channel group, perform data interaction with the child node in the private channel group, and notify the child nodes of different levels to forward the broadcast networking command;

After receiving the network beacon sent by the concentrator, the master node obtains the node identifier, the time cost of the primary node transmitting the message to its 1-hop range child node, and simultaneously performs channel scanning and field strength collection;

The master node waits for the child node to report data, collects and stores the topology data of all the child nodes, calculates and stores the time cost according to the configuration requirements of the concentrator, and dynamically stores the network; the topology data Including the identity of all child nodes, the time cost of the central node to the child node, and the field strength information;

The master node scans the preset number to determine whether there is a conflict in the number. When the number conflicts, the master node randomly generates a number, and then determines whether the number conflicts. When the number does not conflict, the networking succeeds.

The child node is configured to forward the broadcast network command and report the topology data to the master node within a preset time.
The micro-power wireless network according to claim 7, wherein the master node further performs an initialization primary node step before the common channel group hop-by-hop initiation of a broadcast networking command step; the initializing the primary node includes: a primary node Assign addresses, network numbers, and access to multiple channels Line initialization.
The micro-power wireless network according to claim 7, wherein the combining the field strength information, calculating and storing the time cost comprises:

According to the time cost of the primary node transmitting the message to the child node of the 1-hop range, sorting the topology data of the child node of the same level, and storing the data;

The stored data is a node identifier, a time cost of the primary node transmitting the message to the child node, and a correspondence between the node identifier and a time cost of the primary node transmitting the message to the child node.
The micro-power wireless network according to any one of claims 7-9, wherein when the child node is a child node to be accessed, the child node is further configured to:

The sub-nodes that are to be added to the network submit the network application, and the sub-nodes that apply for the network carry the topology information.

After the upper-level node forwards the network access request of the child node to the master node, receiving the network access confirmation information sent by the master node, and acquiring the time cost of the primary node transmitting the message to the child node and the level at which the leaf node is located;

It is determined whether the network node to be accessed is allowed to enter the network. When the child node to be connected to the network is allowed to access the network, the network address is assigned to the child node to be accessed, and the network access information is returned.
The micro power wireless network according to claim 10, wherein the child node is further configured to:

When the child node cannot receive the network data, the child node cyclically switches the channel in multiple receiving channels; when the node switches to a receiving channel, the timer is started, and if no signal is detected within a time period, the switch is switched to The next receive channel; if a signal can be detected for a period of time, the timer is incremented for a fixed period of time.
The micro-power wireless network according to claim 7, wherein the common channel and the private channel have a plurality of frequency points, and each forms a channel group; when communication is required, the selected signal-to-noise ratio is higher in each group. The frequency is used as the priority frequency of operation.