Intelligent sensor network construction and management method based on swan mongolian system

Abstract

The invention relates to the technical field of network construction, and discloses an intelligent sensor network construction and management method based on a swan gap system. Specifically, after network distribution and stabilization of each node are completed, the detection function of adjacent subnetworks can be started, and information of other different-frequency subnetwork nodes can be read according to a detection result through the distributed communication capability of the Gawan system. According to a preset merging rule, the node can judge whether a merging operation needs to be initiated or not, and transmits a merging message through a broadcast mechanism of the swan-gap system, so that the merging of the node and other pilot frequency sub-networks is realized. The process is recursively carried out until all pilot frequency subnets are effectively fused. According to the method, rapid identification and effective fusion of the pilot frequency sub-networks can be realized, the problem that the sub-networks in a traditional wireless Mesh network cannot be fused in a short time is solved, and the cooperative work efficiency of the network and the real-time performance of distribution network protection are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of network construction technology, and specifically to a method for constructing and managing an intelligent sensor network based on the Hongmeng system. Background Art

[0002] With the rapid development of wireless communication technology, wireless mesh networks have shown great potential in industrial scenarios such as distribution network protection due to their multi-hop routing, self-organization, and strong self-healing capabilities. Traditional wireless networks mainly rely on fixed access points (APs) for communication. This single-hop network structure is prone to communication congestion and access point overload when facing complex and changing wireless environments, and it is difficult to meet the high requirements of distribution network protection for communication stability and reliability. Wireless mesh networks achieve multi-hop communication by allowing any wireless device node to act as an AP and a router at the same time, effectively improving the flexibility and robustness of the network.

[0003] However, although wireless mesh networks provide the possibility of multi-path transmission, existing routing algorithms (such as HWMP, BATMAN-adv, etc.) are difficult to achieve optimal routing selection when facing multi-service scenarios at the end of the power grid, resulting in limited overall network performance. Moreover, due to the complexity and variability of the wireless environment, nodes may form multiple heterogeneous subnets after startup rather than a unified network. At present, there is a lack of effective subnet merging solutions, which makes it impossible for these subnets to merge in a short period of time, seriously affecting the collaborative work efficiency of the network and the real-time performance of distribution network protection. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing and managing an intelligent sensor network based on the Hongmeng system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a method for constructing and managing an intelligent sensor network based on the Hongmeng system, comprising: After each node in the sensor network has completed the network deployment and the nodes in the network are stable, the detection function of the adjacent subnet is turned on. Through the distributed communication capability of the Hongmeng system, the node reads the information of other heterofrequency subnet nodes based on the detection results; The node determines whether to initiate a merge operation based on the preset merge rules, transmits the merge message through the broadcast mechanism of the Hongmeng system, and merges itself into other heterogeneous subnets detected; After receiving the merge message, the one-hop neighboring node of the node that discovers other hetero-frequency subnets detects the designated hetero-frequency subnet. If the detection is successful, it continues to broadcast the diffusion merge message and merges it into the detected other hetero-frequency subnets. It is found that the two-hop neighboring nodes of other hetero-frequency subnet nodes and other nodes continue to merge according to the previous strategy until all hetero-frequency subnets are effectively integrated.

[0006] Preferably, the nodes in the self-organizing network topology are divided into: nodes that detect other heterofrequency subnets, one-hop neighboring nodes of the node, two-hop neighboring nodes of the node, and other nodes of the subnet; when heterofrequency subnets are merged, they are diffused and merged layer by layer, that is, the nodes of other heterofrequency subnets are merged first, and then the one-hop neighboring nodes of the node are merged.

[0007] Preferably, after each node joins the network, the subnet stability timer is started, and the subnet stability timer is restarted when a change in the number of nodes in the network is detected; when the subnet node number stability timer times out, it is considered that the number of nodes in the subnet is no longer changing, that is, the subnet is stable, and detection of a new subnet is started.

[0008] Preferably, the method of detecting the heterodyne subnet is: The detection is performed in the form of measurement and control using a neighbor detection algorithm: after the node obtains the corresponding wireless resources within the wireless resource cycle according to the resource allocation plan within the wireless resource cycle, the detection cycle is calculated according to the change in the amount of data to be sent within the wireless resource cycle of the node; the minimum detection cycle of the node is 1, that is, in each wireless resource cycle, the node selects an idle resource to perform hetero-frequency subnet detection; the maximum detection cycle is N, that is, every N wireless resource cycles, the node performs detection on one of the resources that it does not occupy; the initial detection cycle n is N / 2. When the amount of data to be sent within the node unit wireless resource cycle increases by more than the threshold value K, the detection cycle is extended to n+1. If n+1>N, the maximum detection cycle N is taken; conversely, when the amount of data to be sent within the node unit wireless resource cycle decreases below the threshold value K, the detection cycle is shortened to n-1. If n-1<1, the minimum detection cycle 1 is taken; N and K are both preset variables; When the node detects other hetero-frequency subnets, it reads the information of other hetero-frequency subnets and starts the timer when reading; if the reading is successful within the timer, the merging judgment is started; if the reading is not successful within the timer, the merging attempt is stopped; if all other detected hetero-frequency subnet nodes are not read successfully, the node restarts the neighboring area detection; if the reading of other hetero-frequency subnet information is successful, it determines whether the two hetero-frequency subnets have the same network ID based on the read information. If they belong to the same network, the subnet size is determined. If the number of nodes in this subnet is less than the number of nodes in another hetero-frequency subnet, this subnet starts to try to merge into the newly discovered hetero-frequency subnet; if the two hetero-frequency subnets do not have the same network ID or the number of nodes in this subnet is greater than the number of nodes in another subnet, the subnet merging is not performed, and the detection is restarted to find a new hetero-frequency subnet.

[0009] Preferably, when the number of subnet nodes is the same, it is agreed that the subnet with a smaller master node device ID is merged into the larger subnet.

[0010] Preferably, the method of merging different frequency subnets is: After receiving the merge message, each node starts the delayed merge timer. When it finds other hetero-frequency subnets, it broadcasts the merge information to one-hop neighboring nodes, then sends an indication to each node in the subnet that the node is about to leave the network, and then starts searching for a new subnet. When it finds other hetero-frequency subnets, it tries to access the new network. If successful, the process ends. If it fails, it tries to search the network and access the atomic network. After the one-hop neighboring node waits for the timer to time out, it starts detection and starts the detection timer according to the frequency of the new subnet carried in the merged system message. If the detection is successful before the detection timer times out, the node attempts to read other subnet information and starts the reading timer; if the detection timer times out, the detection is stopped and the detection of the new subnet is restarted; if the reading is successful before the reading timer times out, the node broadcasts the merge message to other nodes in the subnet, and then sends a network exit instruction to each node in the subnet, and then attempts to search and access the new subnet; if the reading timer times out, the reading fails, the node stops reading other subnet information and restarts the detection of the new subnet; the one-hop neighboring node attempts to search and access the new network, and if it fails, it attempts to search and access the original network; the two-hop neighboring node and other nodes in the subnet are analogous.

[0011] Preferably, the duration of the delayed merging timer started by each node is determined according to the time when the node that discovers the new subnet accesses the new subnet.

[0012] Preferably, the content of the merge message includes the current node ID, the target merged subnet frequency and the target merged subnet node ID.

[0013] Preferably, if a node that has not found a hetero-frequency subnet receives multiple merge messages carrying different hetero-frequency subnets during the detection phase, the timestamp T0 when different special merge messages are received is recorded, and processing is performed according to the detection result after the delayed access timer expires. If the detection is successful, the first received merge message is sent to the neighboring node; if the detection fails, the time difference between the current time T1 and the previously recorded timestamp is calculated: T1-T0, and compared with the delayed access timer duration T. If the former is larger, the other hetero-frequency subnets carried by the second merge message are directly detected. If the latter is larger, the delayed access timer is started, and the timing duration is the difference between the latter and the former: T-(T1-T0). After the timer times out, try detection again.

[0014] Preferably, if the node discovering other subnets receives different merge messages while reading other subnets, the new subnet is stored and the original reading process is continued; if the node of this subnet or the node discovering other subnets receives the same merge message, the same merge message received later is directly discarded.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The Hongmeng system has powerful distributed communication capabilities, which enables each node in the sensor network to easily exchange information with other nodes and provide basic data support for subsequent merging operations. By introducing the detection function of adjacent subnets and preset merging rules, the present invention can realize the rapid identification and effective fusion of heterogeneous subnets, solving the problem that subnets in traditional wireless Mesh networks cannot be merged in a short time, and significantly improving the collaborative work efficiency of the network and the real-time performance of distribution network protection.

[0016] The distributed and self-organizing characteristics of the Hongmeng system make the present invention have good scalability and broad application prospects. In complex and changeable environments such as distribution network protection, the present invention can flexibly adapt to changes in network scale and the increase or decrease in the number of nodes to ensure the stability and efficiency of the network. At the same time, this intelligent sensor network construction and management method based on the Hongmeng system is also convenient for wide promotion, application and deployment in various fields, providing strong support for intelligent and efficient network management. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the basic merging process of the ad hoc network subnet; Figure 2 It is the network topology diagram of the ad hoc network; Figure 3 Flowchart for detecting other subnet nodes; Figure 4 This is a schematic diagram of the strategy for dynamically adjusting the detection cycle; Figure 5 Flowchart for detecting N-hop neighbor nodes in other subnets; Figure 6 This is a schematic diagram of the conflict handling scenario. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-6 The present invention provides a technical solution: a method for constructing and managing an intelligent sensor network based on the Hongmeng system, comprising: Node deployment and stability detection: After each node in the sensor network completes the deployment process, it enters the stable state detection phase. This phase ensures that all nodes are stably connected to the network and have the conditions for subsequent operations.

[0020] Enable the adjacent subnet detection function: When the node detects that the network is stable, it enables the adjacent subnet detection function, allowing the node to scan and identify other heterodyne subnets that may exist around it, read the relevant information of the nodes in these subnets, and prepare for subsequent subnet merging operations.

[0021] Merge rule judgment and message broadcast: The node determines whether to initiate a merge operation based on the preset merge rules. These rules include factors such as frequency differences between subnets, number of nodes, network load, etc. Once the decision to merge is made, the node transmits the merge message through the broadcast mechanism of the Hongmeng system and merges itself into other subnets with different frequencies that are detected.

[0022] Merging operation of one-hop neighbor nodes: After receiving the merge message, the one-hop neighbor nodes of the node that discovered other hetero-frequency subnets start to detect the specified hetero-frequency subnet. If the detection is successful, these one-hop neighbor nodes continue to broadcast the diffusion merge message and merge themselves into the detected other hetero-frequency subnets.

[0023] Merge of two-hop neighbor nodes and other nodes: The two-hop neighbor nodes and other nodes of other hetero-frequency subnet nodes are found to continue to merge according to the previous strategy. This process continues until all hetero-frequency subnets are effectively merged to form a unified wireless mesh network.

[0024] Network performance optimization and real-time monitoring: After the subnet merger is completed, the wireless communication system continues to optimize network performance to ensure that the high requirements of distribution network protection for communication stability and reliability are met. At the same time, the system monitors the network status in real time to promptly detect and handle any potential network problems.

[0025] See attached Figure 2 ,Nodes in the network topology of the ad hoc network can be divided into: nodes that detect other hetero-frequency subnets, one-hop neighbor nodes of the node, two-hop neighbor nodes of the node, and other nodes in the subnet. When hetero-frequency subnets are merged, they are diffused and merged layer by layer, that is, nodes that detect other hetero-frequency subnets are merged first, and then the one-hop neighbor nodes of the node are merged, and so on.

[0026] The merging of heterogeneous subnets is divided into the following two stages: subnet detection and subnet merging. In these two stages, specific processing mechanisms are proposed for conflicts.

[0027] The present invention will be further described below in conjunction with Examples 1 to 3.

[0028] Example 1 See attached Figure 3 and 4 This embodiment is directed to the detection method of the hetero-frequency subnet, and the implementation method is as follows: After a period of time, the number of nodes in each subnet will gradually stabilize. After each node is connected to the network, the subnet stability timer is started. When the number of nodes in the network changes, the subnet stability timer is restarted. When the subnet node number stability timer times out, it is considered that the number of nodes in the subnet is no longer changing, that is, the subnet is stable, and the detection of a new subnet is started.

[0029] The measurement detection is carried out in the form of measurement and control using the neighbor detection algorithm. After the node obtains the corresponding wireless resources in the wireless resource cycle according to the resource allocation plan in the wireless resource cycle, the detection cycle can be calculated according to the change in the amount of data to be sent in the wireless resource cycle of the node. The minimum detection cycle of the node is 1, that is, in each wireless resource cycle, the node selects an idle resource to perform inter-frequency subnet detection; the maximum detection cycle is N, that is, every N wireless resource cycles, the node performs detection on one of the resources that it does not occupy; the initial detection cycle n is N / 2. When the amount of data to be sent in the node unit wireless resource cycle increases by more than the threshold value K, the detection cycle is extended to n+1 (if n+1>N, the maximum detection cycle N is taken); conversely, when the amount of data to be sent in the node unit wireless resource cycle decreases below the threshold value K, the detection cycle is reduced to n-1 (if n-1<1, the minimum detection cycle 1 is taken). Both N and K can be set by themselves. When setting, the ratio of all idle resources to occupied resources in each wireless resource cycle can be considered. For example, when the ratio exceeds 1:4, the detection cycle N value can be gradually reduced to reduce the waste of idle resources.

[0030] When the node measurement detects other hetero-frequency subnets, it attempts to read the information of other hetero-frequency subnets (the reading should be performed when the node is idle as much as possible). The timer needs to be turned on when reading. If the reading is successful within the timer, the merge judgment will start. If the reading is not successful within the timer, the attempt to merge will stop. If all other detected hetero-frequency subnet nodes are not read successfully, the node will restart the neighbor detection; if the reading of other hetero-frequency subnet information is successful, it will determine whether the two hetero-frequency subnets have the same network ID based on the read information. If they belong to the same network, the subnet size will be determined. If the number of nodes in this subnet is less than the number of nodes in another hetero-frequency subnet, this subnet will start to try to merge into the newly discovered hetero-frequency subnet; if the two hetero-frequency subnets do not have the same network ID or the number of nodes in this subnet is greater than the number of nodes in another subnet, the subnet merger will not be performed, and the detection will be restarted to find a new hetero-frequency subnet. In particular, when the number of subnet nodes is the same, it is agreed that the subnet with a smaller master node device ID will be merged into the larger subnet.

[0031] Example 2 See attached Figure 5 This embodiment is directed to the processing flow after the node receives the merge message, and the specific behavior of discovering other hetero-frequency subnet nodes, one-hop neighbor nodes, two-hop neighbor nodes and other nodes in the subnet. The specific implementation method is as follows: Processing of the node receiving the merge message: After receiving the merge message, each node will start the delayed merge timer, the duration of which is estimated based on the time it takes for the node that discovers the new subnet to access the new subnet. The content of the merge message includes information such as the node ID, the target merged subnet frequency, and the target merged subnet node ID.

[0032] Behavior of nodes that discover other heterogeneous subnets: The node that discovers other hetero-frequency subnets broadcasts the merge information to its one-hop neighbor node through a merge message. Subsequently, the node sends an indication to each node in the subnet that the node is about to leave the network. Then, the node tries to search for a new subnet and try to access the new network. If the access is successful, the process ends; if the access fails, the node tries to search for the network and access the original network.

[0033] Behavior of one-hop neighboring nodes: After receiving the merge message, the one-hop neighbor node waits for the delayed merge timer to time out, and then starts detecting the new subnet according to the frequency of the new subnet carried in the message, and starts the detection timer. If the detection is successful before the detection timer times out, the node attempts to read other subnet information and starts the read timer. If the detection timer times out, the detection is stopped and the detection of the new subnet is restarted. If the reading is successful before the read timer times out, the node broadcasts the merge message to other nodes in the subnet, then sends a network exit instruction to each node in the subnet, and then attempts to search for cells to access the new subnet. If the read timer times out, the reading fails, and the node stops reading other subnet information and restarts detecting the new subnet. The one-hop neighbor node also attempts to search for cells to access the new network. If it fails, it attempts to search the network to access the original network.

[0034] Behavior of two-hop neighboring nodes and other nodes in this subnet: The two-hop neighbor nodes and other nodes in the subnet are processed in the same way as the one-hop neighbor nodes. They will also try to detect the new subnet and read other subnet information based on the received merge message, and decide whether to broadcast the merge message, send a network exit instruction, or try to access the new subnet or the original network based on the timer.

[0035] Example 3 See attached Figure 6 This embodiment is directed to the processing mechanism when a node receives multiple special merge messages during the detection phase, and the processing method of other subnet nodes and non-discovered subnet nodes on special merge messages. The specific implementation method is as follows: The node that does not find the heterogeneous subnet processes multiple special merge messages: When a node that has not found an inter-frequency subnet receives multiple special merge messages during the detection phase, and these messages carry different inter-frequency subnet information, the node first records the timestamp T0 when each special merge message is received. After the delayed access timer expires, the node processes according to the detection result: If the detection is successful, the special merge message received for the first time is sent to the neighboring node to initiate the merge operation.

[0036] If the detection fails, the time difference (T1-T0) between the current time T1 and the previously recorded timestamp T0 is calculated, and the time difference is compared with the duration T of the delayed access timer: If the time difference (T1-T0) is greater than the duration T, it means that the waiting time is long enough, and the node directly detects other hetero-frequency subnets carried by the second special merge message.

[0037] If the time difference (T1-T0) is less than the duration T, it means that it needs to continue waiting, and the node starts the delayed access timer with a duration of T-(T1-T0). After the timer times out, the node tries to detect the hetero-frequency subnet again.

[0038] Nodes that discover other subnets process special merge messages: If a node that discovers other subnets receives different special merge messages during reading of other subnets, it stores the information of the new subnet and continues the original reading process to process all received special merge messages.

[0039] A non-discovery subnet node or a discovery subnet node processes the same special merge message: If a node that has not discovered other subnets or has discovered other subnets receives the same special merge message, it directly discards the same special merge message received later to avoid repeated processing and waste of network resources.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing and managing an intelligent sensor network based on Hongmeng system, characterized in that: include: After each node in the sensor network has completed the network deployment and the nodes in the network are stable, the detection function of the adjacent subnet is turned on. Through the distributed communication capability of the Hongmeng system, the node reads the information of other heterofrequency subnet nodes based on the detection results; The node determines whether to initiate a merge operation based on the preset merge rules, transmits the merge message through the broadcast mechanism of the Hongmeng system, and merges itself into other heterogeneous subnets detected; After receiving the merge message, the one-hop neighboring node of the node that discovers other hetero-frequency subnets detects the designated hetero-frequency subnet. If the detection is successful, it continues to broadcast the diffusion merge message and merges it into the detected other hetero-frequency subnets. It is found that the two-hop neighboring nodes of other hetero-frequency subnet nodes and other nodes continue to merge according to the previous strategy until all hetero-frequency subnets are effectively integrated.

2. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 1 is characterized in that: The nodes in the self-organizing network topology are divided into: nodes that detect other hetero-frequency subnets, one-hop neighboring nodes of the node, two-hop neighboring nodes of the node, and other nodes of the subnet; when hetero-frequency subnets are merged, they are diffused and merged layer by layer, that is, the nodes of other hetero-frequency subnets are merged first, and then the one-hop neighboring nodes of the node are merged.

3. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 2 is characterized in that: After each node joins the network, the subnet stability timer is started. When a change in the number of nodes on the network is detected, the subnet stability timer is restarted. When the subnet node number stability timer times out, it is considered that the number of nodes in this subnet is no longer changing, that is, the subnet is stable, and the detection of a new subnet is started.

4. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 3 is characterized in that: The method of detecting heterodyne subnet is as follows: The detection is performed in the form of measurement and control using a neighbor detection algorithm: after the node obtains the corresponding wireless resources within the wireless resource cycle according to the resource allocation plan within the wireless resource cycle, the detection cycle is calculated according to the change in the amount of data to be sent within the wireless resource cycle of the node; the minimum detection cycle of the node is 1, that is, in each wireless resource cycle, the node selects an idle resource to perform hetero-frequency subnet detection; the maximum detection cycle is N, that is, every N wireless resource cycles, the node performs detection on one of the resources that it does not occupy; the initial detection cycle n is N / 2. When the amount of data to be sent within the node unit wireless resource cycle increases by more than the threshold value K, the detection cycle is extended to n+1. If n+1>N, the maximum detection cycle N is taken; conversely, when the amount of data to be sent within the node unit wireless resource cycle decreases below the threshold value K, the detection cycle is shortened to n-1. If n-1<1, the minimum detection cycle 1 is taken; N and K are both preset variables; When the node detects other hetero-frequency subnets during measurement, it reads the information of other hetero-frequency subnets and starts the timer during reading; If the reading is successful within the timer, the merging judgment will start. If the reading is not successful within the timer, the merging attempt will be stopped. If all other detected hetero-frequency subnet nodes are not read successfully, the node will restart the neighboring area detection. If the reading of other hetero-frequency subnet information is successful, the two hetero-frequency subnets will be judged according to the read information whether they are the same network ID. If they belong to the same network, the subnet size will be judged. If the number of nodes in this subnet is less than the number of nodes in another hetero-frequency subnet, this subnet will start to try to merge into the newly discovered hetero-frequency subnet. If the two hetero-frequency subnets are not the same network ID or the number of nodes in this subnet is greater than the number of nodes in another subnet, the subnet merging will not be performed, and the detection will be restarted to find the new hetero-frequency subnet.

5. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 4 is characterized in that: When the number of subnet nodes is the same, it is agreed that the subnet with a smaller master node device ID will be merged into the larger subnet.

6. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 5 is characterized in that: The method of merging different frequency subnets is as follows: After receiving the merge message, each node starts the delayed merge timer. When it finds other hetero-frequency subnets, it broadcasts the merge information to one-hop neighboring nodes, then sends an indication to each node in the subnet that the node is about to leave the network, and then starts searching for a new subnet. When it finds other hetero-frequency subnets, it tries to access the new network. If successful, the process ends. If it fails, it tries to search the network and access the atomic network. After the waiting timer of the one-hop neighbor node times out, it starts detection and starts the detection timer according to the frequency of the new subnet carried in the merged system message. If the detection is successful before the detection timer times out, the node attempts to read other subnet information and starts the reading timer; if the detection timer times out, the detection is stopped and the detection of the new subnet is restarted; if the reading is successful before the reading timer times out, the node broadcasts the merge message to other nodes in the subnet, then sends a network exit instruction to each node in the subnet, and then tries to search and access the new subnet; if the reading timer times out, the reading fails, the node stops reading other subnet information and restarts the detection of the new subnet; The one-hop neighbor node tries to search and access the new network. If it fails, it tries to search and access the original network. The same goes for the two-hop neighbor nodes and other nodes in the subnet.

7. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 1 is characterized in that: The duration of the delayed merging timer started by each node is determined according to the time when the node discovering the new subnet accesses the new subnet.

8. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 1 is characterized in that: The content of the merge message includes the current node ID, the target merged subnet frequency point and the target merged subnet node ID.

9. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 8 is characterized in that: If a node that has not found an inter-frequency subnet receives multiple merge messages carrying different inter-frequency subnets during the detection phase, it records the timestamp T0 when different special merge messages are received, and processes them according to the detection results after the delayed access timer expires. If the detection is successful, the first received merge message is sent to the neighboring node; if the detection fails, the time difference between the current time T1 and the previously recorded timestamp is calculated: T1-T0, and compared with the delayed access timer duration T. If the former is larger, the other inter-frequency subnets carried by the second merge message are directly detected. If the latter is larger, the delayed access timer is started, and the timing duration is the difference between the latter and the former: T-(T1-T0). After the timer expires, try to detect again.

10. The method for constructing and managing an intelligent sensor network based on Hongmeng system according to claim 9 is characterized in that: If the node discovering other subnets receives a different merge message while reading other subnets, the new subnet is stored and the original reading process is continued; if the node of this subnet or the node discovering other subnets receives the same merge message, the same merge message received later is directly discarded.

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