CN111245663B - Dynamic construction method for video monitoring network - Google Patents
Dynamic construction method for video monitoring network Download PDFInfo
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- CN111245663B CN111245663B CN202010181676.0A CN202010181676A CN111245663B CN 111245663 B CN111245663 B CN 111245663B CN 202010181676 A CN202010181676 A CN 202010181676A CN 111245663 B CN111245663 B CN 111245663B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a dynamic construction method of a video monitoring network, wherein the method comprises the following steps of S1: setting the same network ID, routing configuration and softtap configuration for all nodes needing to be accessed to a video monitoring network; step S2: designating any one node as a root node of the video monitoring network and connecting the root node with a router; further comprising step S3: the node sends connection request information to the preferred father node; step S4: judging the layer number of the preferred father node positioned in the network; step S5: selecting a node with the maximum signal strength and the signal strength larger than an access threshold to access a preferred father node; step S6: the node accessed to the preferred parent node is disconnected with the preferred parent node, and all the nodes at the lower layer are disconnected; by the method, the problem that the video monitoring network cannot be optimized due to the fact that the video monitoring network cannot be dynamically constructed in the construction process of the video monitoring network is solved.
Description
Technical Field
The invention relates to the technical field of networks, in particular to a dynamic construction method of a video monitoring network.
Background
The video monitoring network is an important component in a security technology system, and is an advanced comprehensive monitoring network with extremely strong security capability. The video monitoring system can directly watch the condition of the monitored place through the remote control camera and the auxiliary equipment thereof, and simultaneously, the video monitoring network can record all or part of the images of the monitored place, so that convenience conditions and important basis are provided for processing certain events in the future. Currently, the existing video monitoring network is mostly constructed in a wired or wireless mode, and video data is transmitted through a line or through a fixed router. However, in the process of constructing the video monitoring network, when the node is newly added, the video monitoring network cannot automatically add the new node and re-establish the video monitoring network; therefore, the video monitoring network always keeps the existing state, the optimization of the construction of the video monitoring network cannot be guaranteed, and the video transmission efficiency of the video monitoring network is greatly reduced.
Disclosure of Invention
The invention provides a dynamic construction method of a video monitoring network, which solves the problem that the video monitoring network cannot be optimized because the video monitoring network cannot be constructed dynamically in the construction process of the video monitoring network.
The invention is realized by the following technical scheme:
a dynamic construction method of a video monitoring network comprises the following steps of S1: setting the same network ID, routing configuration and softtap configuration for all nodes needing to be accessed to a video monitoring network; step S2: designating any one node as a root node of the video monitoring network and connecting the root node with a router; the method is characterized by further comprising the following steps:
s3: if all nodes are added into the video monitoring network or the video monitoring network reaches the maximum running layer number, the video monitoring network is built; otherwise, the nodes send beacon frames to each other, except the root node, the node which fails to access the video monitoring network judges the preferred father node of the node according to the received beacon frames, sends connection request information to the preferred father node, and enters step S4;
s4: when the preferred father node in the step S3 receives the connection request information sent by the node in the step S3, if the preferred father node is positioned at the maximum allowable layer of the video monitoring network, the preferred father node is not allowed to be accessed, and the step S3 is repeated; otherwise, enter step S5;
s5: if the actual access quantity of the preferred father node is smaller than the maximum value of the accessible quantity, the preferred father node obtains the signal strength of the connection request information according to the received connection request information, selects the node with the maximum signal strength and with which the signal strength is larger than the access threshold value to be accessed, otherwise, the node is not allowed to be accessed, and the step S3 is repeated;
if the actual access number of the preferred father node is equal to the maximum value of the accessible number, the preferred father node obtains the minimum value of the signal intensity of the beacon frame which is accessed to the father node according to the beacon frame sent by the node, and meanwhile obtains the maximum value of the signal intensity of the connection request information according to the received connection request information, and then the step S6 is carried out;
s6: if the maximum value of the signal intensity of the connection request information is smaller than the minimum value of the signal intensity of the beacon frame, the existing connection state is kept unchanged, and the step S3 is repeated;
if the maximum value of the signal intensity of the connection request information is larger than the minimum value of the signal intensity of the beacon frame, the node which sends the connection request information and has the maximum signal intensity is accessed to the preferred father node, the node which sends the beacon frame and has the minimum signal intensity is disconnected with the preferred father node, all the nodes at the lower layer are disconnected, and the step S3 is repeated;
in the technical scheme, when a root node is selected, a node closest to a router is generally selected as the root node, and a beacon frame of the root node is set for constructing a video monitoring network; the fact that any node which fails to access the video monitoring network cannot be added to any preferred parent node means that after all nodes which fail to access the video monitoring network attempt to access different preferred parent nodes, the preferred parent nodes do not allow access, at this time, all nodes which fail to access the video monitoring network cannot be added to the video monitoring network, at this time, all nodes which fail to access the video monitoring network are excluded from network construction, and network establishment is completed. In step S6, the node that sends the beacon frame with the minimum signal strength and has been accessed to the preferred parent node will disconnect from the preferred parent node, and all the nodes at the lower layer thereof will be completely disconnected, which means that after a certain node disconnects from the preferred parent node, all the nodes at the lower layer of the node will be completely disconnected, and the node that is not accessed to the video monitoring network is used as a new node that attempts to access to the video monitoring network; according to the technical scheme, in the construction process of the video monitoring network, when nodes which cannot be accessed to the video monitoring network newly exist, all nodes except the root node mutually send beacon frames, and the node which cannot be accessed to the video monitoring network judges a preferred father node of the node according to the received beacon frames and tries to access the preferred father node; the preferred father node dynamically adjusts the node to which the father node is connected according to the received beacon frame, so as to ensure the dynamic adjustment of the video monitoring network; when all nodes are added into the video monitoring network or the video monitoring network reaches the maximum number of operation layers, the video monitoring network completes construction, and all nodes are ensured to be conditionally connected into the video monitoring network, so that the optimization of the construction of the video monitoring network is ensured.
As a further improvement of the invention, the beacon frame comprises the current node type, the current node layer number, the maximum layer number allowed by the network, the number of sub-nodes accessed to the current node, the maximum value of the accessible number of the current node and the signal intensity of the current node; the current node category comprises a root node, an intermediate node and a leaf node;
in the technical scheme, each node with a softap interface in a video monitoring network periodically sends Wi-Fi beacon frames to other nodes; one node uses the beacon frame to allow other nodes to detect its presence and know its status; and the nodes in the video monitoring network can form connection through various parameters of the beacon frame, so that the dynamic construction of the video monitoring network is ensured.
Further, the maximum value of the accessible number of the current node is 10 to 15.
Further, in the beacon frames sent by all the nodes which fail to access the video monitoring network, the maximum value of the accessible quantity of the current node and the signal strength of the current node have numerical values, and the other parameters are null.
In the technical scheme, in the beacon frames sent by all nodes which cannot be accessed to the video monitoring network, only the maximum value of the accessible quantity of the current node and the signal strength of the current node can be determined, and the other parameters are unknown, so that the other parameters are empty.
Further, after the node accesses the preferred father node, the number of the child nodes accessed to the current node in the beacon frame sent by the preferred father node is increased by 1; if the current node type in the beacon frame sent by the preferred father node is a root node or an intermediate node, the current node type is kept unchanged; if the current node type in the beacon frame sent by the preferred father node is a leaf node, setting the current node type as an intermediate node;
the maximum number of layers allowed by the network in the beacon frame sent by the node is consistent with the maximum number of layers allowed by the network in the beacon frame sent by the preferred father node; the number of the child nodes accessed to the current node in the beacon frame sent by the node is set to 0; the number of the current node layers in the beacon frame sent by the node is 1 added to the number of the current node layers in the beacon frame sent by the preferred father node; the current node type in the beacon frame sent by the node is set as the leaf node.
Further, after all lower nodes of the node are disconnected, the current node type, the current node layer number, the maximum layer number allowed by the network and the number of sub-nodes accessed to the current node in the beacon frame sent by all the lower nodes are set to be null;
in the technical scheme, after all lower nodes of the node are disconnected, all lower nodes become new nodes which cannot be accessed to the video monitoring network, so that the current node type, the current node layer number, the maximum layer number allowed by the network and the number of child nodes accessed to the current node are set to be null.
Further, in step S3, the step of determining, by all nodes that fail to access the video monitoring network according to the received beacon frame, a preferred parent node of the node, and sending connection request information to the preferred parent node means that all nodes that fail to access the video monitoring network select the preferred parent node according to the number of current node layers in the received beacon frame, the number of child nodes that access the current node, and the signal strength of the current node; all nodes which fail to access the video monitoring network are used for preferentially selecting the node with the shallowest current node layer number as a preferred father node; if the number of the current node layers is a plurality of potential father nodes, selecting the node with the least number of the child nodes accessed to the current node as the preferred father node; if a plurality of potential father nodes exist in the current node layer number and the number of the child nodes accessed to the potential father nodes is the same, selecting the node with the maximum signal intensity of the current node as the preferred father node; if the number of the current node layers, the number of the child nodes accessed to the current node and the signal strength of the current node in each beacon frame are the same, one current node is randomly used as a preferred father node.
Further, when the number of the current node layers is equal to the maximum number of the network allowed in all beacon frames received by all nodes which cannot access the video monitoring network, all nodes which cannot access the video monitoring network will remain idle;
in the technical scheme, the number of the current node layers is equal to the maximum number of the allowed network layers in all beacon frames received by all nodes which cannot access the video monitoring network, and at the moment, in order to ensure that the maximum number of the allowed network layers is not exceeded, all nodes which cannot access the video monitoring network are kept in an idle state, so that the transmission performance of the network is ensured.
Further, the magnitude of the access threshold is-85 dbm to-40 dbm;
further, the nodes adopt video monitoring equipment; the video monitoring equipment comprises a WIFI-MESH processing module, a UPS power module, a power conversion module, an omnidirectional antenna module and a camera module, wherein the omnidirectional antenna module, the UPS power module and the camera module are connected with the WIFI-MESH processing module, and the power conversion module is connected with the UPS power module;
in the technical scheme, because the network is a video monitoring network, each node needs to adopt video monitoring equipment; in the construction of the video monitoring network, the beacon frame is analyzed and transmitted through the WIFI-MESH processing module and the omnidirectional antenna module, meanwhile, the UPS power module can effectively ensure the electricity safety of the video monitoring equipment, and the shell design of the video monitoring equipment has a strong anti-collision function, an anti-static function and a heat conducting property, so that the use reliability of the video monitoring equipment is improved.
In summary, the invention has the beneficial effects that each node accesses the video monitoring network through the parameter judgment of the beacon frame in the construction process of the video monitoring network, thereby ensuring the dynamic regulation of the video monitoring network; meanwhile, all nodes are conditionally connected into the video monitoring network, so that the optimization of the construction of the video monitoring network is ensured; finally, each node of the video monitoring network guarantees the safety and reliability of the work of each node in the construction of the video monitoring network by adopting video monitoring equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a block diagram of a video monitoring device according to the present invention.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
as shown in fig. 1, the invention provides a method for dynamically constructing a video monitoring network, which solves the problem that the video monitoring network cannot be optimized because the video monitoring network cannot be dynamically constructed in the construction process of the video monitoring network.
The invention is realized by the following technical scheme:
a dynamic construction method of a video monitoring network comprises the following steps of S1: setting the same network ID, routing configuration and softtap configuration for all nodes needing to be accessed to a video monitoring network; step S2: designating any one node as a root node of the video monitoring network and connecting the root node with a router; the method is characterized by further comprising the following steps:
s3: if all nodes are added into the video monitoring network or the video monitoring network reaches the maximum running layer number, the video monitoring network is built; otherwise, the nodes send beacon frames to each other, except the root node, the node which fails to access the video monitoring network judges the preferred father node of the node according to the received beacon frames, sends connection request information to the preferred father node, and enters step S4;
s4: when the preferred father node in the step S3 receives the connection request information sent by the node in the step S3, if the preferred father node is positioned at the maximum allowable layer of the video monitoring network, the preferred father node is not allowed to be accessed, and the step S3 is repeated; otherwise, enter step S5;
s5: if the actual access quantity of the preferred father node is smaller than the maximum value of the accessible quantity, the preferred father node obtains the signal strength of the connection request information according to the received connection request information, selects the node with the maximum signal strength and with which the signal strength is larger than the access threshold value to be accessed, otherwise, the node is not allowed to be accessed, and the step S3 is repeated;
if the actual access number of the preferred father node is greater than or equal to the maximum value of the accessible number, the preferred father node obtains the minimum value of the signal intensity of the beacon frame which is accessed to the father node according to the beacon frame sent by the node, and meanwhile obtains the maximum value of the signal intensity of the connection request information according to the received connection request information, and then the step S6 is carried out;
s6: if the maximum value of the signal intensity of the connection request information is smaller than the minimum value of the signal intensity of the beacon frame, the existing connection state is kept unchanged, and the step S3 is repeated;
if the maximum value of the signal intensity of the connection request information is greater than the minimum value of the signal intensity of the beacon frame, the node which sends the connection request information and has the maximum signal intensity will be accessed to the preferred father node, the node which sends the beacon frame and has the minimum signal intensity is disconnected from the preferred father node, all the nodes at the lower layer are disconnected, and the step S3 is repeated.
The beacon frame comprises a current node type, a current node layer number, a maximum layer number allowed by a network, the number of child nodes accessed to the current node, the maximum value of the accessible number of the current node and the signal intensity of the current node; the current node category comprises a root node, an intermediate node and a leaf node.
In the beacon frames sent by all nodes which cannot access the video monitoring network, the maximum value of the accessible quantity of the current node and the signal intensity of the current node have numerical values, and the other parameters are null.
After the node accesses the preferred father node, the number of the child nodes accessed to the current node in the beacon frame sent by the preferred father node is increased by 1; if the current node type in the beacon frame sent by the preferred father node is a root node or an intermediate node, the current node type is kept unchanged; if the current node type in the beacon frame sent by the preferred father node is a leaf node, setting the current node type as an intermediate node;
the maximum number of layers allowed by the network in the beacon frame sent by the node is consistent with the maximum number of layers allowed by the network in the beacon frame sent by the preferred father node; the number of the child nodes accessed to the current node in the beacon frame sent by the node is set to 0; the number of the current node layers in the beacon frame sent by the node is 1 added to the number of the current node layers in the beacon frame sent by the preferred father node; the current node type in the beacon frame sent by the node is set as the leaf node.
After all lower nodes of the node are disconnected, the current node type, the current node layer number, the maximum layer number allowed by the network and the number of sub-nodes accessed to the current node in the beacon frame sent by all the lower nodes are set to be null.
In step S3, all nodes failing to access the video monitoring network determine a preferred parent node of the node according to the received beacon frame, and send connection request information to the preferred parent node, which means that all nodes failing to access the video monitoring network select the preferred parent node according to the number of current node layers in the received beacon frame, the number of child nodes accessing the current node, and the signal strength of the current node; all nodes which fail to access the video monitoring network are used for preferentially selecting the node with the shallowest current node layer number as a preferred father node; if the number of the current node layers is a plurality of potential father nodes, selecting the node with the least number of the child nodes accessed to the current node as the preferred father node; if a plurality of potential father nodes exist in the current node layer number and the number of the child nodes accessed to the potential father nodes is the same, selecting the node with the maximum signal intensity of the current node as the preferred father node; if the number of the current node layers, the number of the child nodes accessed to the current node and the signal strength of the current node in each beacon frame are the same, one current node is randomly used as a preferred father node.
When the number of the current node layers is equal to the maximum number of the network allowed in all beacon frames received by all nodes which fail to access the video monitoring network, all nodes which fail to access the video monitoring network will remain idle.
In this embodiment, the video monitoring network will use configuration parameters of the MESH data network to configure network IDs, routing configuration and softaps of all nodes; when a root node is selected, a node closest to a router is generally selected as the root node, and a beacon frame of the root node is set for construction of a video monitoring network; the fact that any node which fails to access the video monitoring network cannot be added to any preferred parent node means that after all nodes which fail to access the video monitoring network attempt to access different preferred parent nodes, the preferred parent nodes do not allow access, at this time, all nodes which fail to access the video monitoring network cannot be added to the video monitoring network, at this time, all nodes which fail to access the video monitoring network are excluded from network construction, and network establishment is completed. In step S6, the node that sends the beacon frame with the minimum signal strength and has been accessed to the preferred parent node will disconnect from the preferred parent node, and all the nodes at the lower layer thereof will be completely disconnected, which means that after a certain node disconnects from the preferred parent node, all the nodes at the lower layer of the node will be completely disconnected, and the node that is not accessed to the video monitoring network is used as a new node that attempts to access to the video monitoring network; in the process of constructing the video monitoring network, the construction of the network may be affected by the power-on sequence of the nodes; if a certain node is powered on asynchronously, if the node is a root node, the rest nodes keep an idle state until the root node is powered on and reset; if the node is not the root node, the node will not attempt to access the video monitoring network, and the other nodes will access the video monitoring network according to the method; when a certain node is powered on and reset, the node becomes a newly added node which cannot be accessed to the video monitoring network, and is accessed to the video monitoring network according to the method; in an ideal case, all nodes are powered on synchronously; when a newly added node which cannot be accessed to the video monitoring network exists, all nodes except the root node send beacon frames to each other, and the node which cannot be accessed to the video monitoring network judges a preferred father node of the node according to the received beacon frames and tries to access the preferred father node; the preferred father node dynamically adjusts the node to which the father node is connected according to the received beacon frame, so as to ensure the dynamic adjustment of the video monitoring network; when all nodes are added into the video monitoring network or the video monitoring network reaches the maximum number of operation layers, the video monitoring network completes construction, and all nodes are ensured to be conditionally connected into the video monitoring network, so that the optimization of the construction of the video monitoring network is ensured.
Each node with a softtap interface in the video monitoring network will periodically send Wi-Fi beacon frames to other nodes; one node uses the beacon frame to allow other nodes to detect its presence and know its status; the maximum number of layers allowed by the network in the beacon frame limits the node depth of the video monitoring network, and is determined by a typical performance calculation formula of 1/N, wherein N is the hop count; therefore, the performance of the video monitoring network decays with the reciprocal of the hop count, in which case the hop count recommended in general engineering does not exceed 4 hops, and at most 8 hops; and the nodes in the video monitoring network can form connection through various parameters of the beacon frame, so that the dynamic construction of the video monitoring network is ensured.
As the number of the video monitoring network nodes increases, the throughput of the video monitoring network nodes rapidly decreases, and the total bandwidth also decreases; the maximum value of the accessible quantity of the current node is 10 in consideration of the bandwidth of the network and the performance of the nodes, so that the transmission performance of the video monitoring network is ensured.
In the beacon frames sent by all nodes which cannot access the video monitoring network, only the maximum value of the accessible quantity of the current node and the signal strength of the current node can be determined, and the other parameters are unknown, so that the other parameters are null.
Since all lower nodes of the node become new nodes which cannot access the video monitoring network after all lower nodes of the node are disconnected, the current node type, the current node layer number, the maximum layer number allowed by the network and the number of child nodes accessing the current node are set to be null.
Because the number of the current node layers is equal to the maximum number of the network allowed in all the beacon frames received by all the nodes which cannot access the video monitoring network, at this time, in order to ensure that the maximum number of the network allowed is not exceeded, all the nodes which cannot access the video monitoring network will keep an idle state, thereby ensuring the transmission performance of the network.
The access threshold is typically-85 dbm to-40 dbm, and in this embodiment, in order to ensure that as many nodes as possible access the video monitoring network, the access threshold is-85 dbm.
Fig. 2 is a schematic structural diagram of the video monitoring device; the environment in which the video monitoring device is used has a certain explosion risk, so that a control terminal must adopt a certain safety measure. To ensure the safety of the use of the electric appliance, various safety designs of the control terminal must be enhanced. The video monitoring equipment application scene comprises an explosion dangerous operation environment with combustible dust, an explosion dangerous operation environment with flammable and explosive steam or gas and a dangerous operation environment in which the combustible dust and the flammable and explosive steam or gas exist simultaneously. Therefore, the video monitoring equipment shell design has a strong anti-collision function, an anti-static function and a heat conducting property, and the use reliability of the video monitoring equipment is improved; meanwhile, the UPS power module can effectively ensure the electricity safety of the video monitoring equipment; in this embodiment, the power conversion module converts ac 220V to dc 5V, and the beacon frame is analyzed and transmitted by the WIFI-MESH processing module and the omni-directional antenna module, so as to ensure the construction of the video monitoring network.
According to the construction method, in the construction process of the video monitoring network, each node is judged to be accessed into the video monitoring network through the parameters of the beacon frames, so that the dynamic regulation of the video monitoring network is ensured; meanwhile, all nodes are conditionally connected into the video monitoring network, so that the optimization of the construction of the video monitoring network is ensured; finally, each node of the video monitoring network guarantees the safety and reliability of the work of each node in the construction of the video monitoring network by adopting video monitoring equipment.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (8)
1. A dynamic construction method of a video monitoring network comprises the following steps of S1: setting the same network ID, routing configuration and softtap configuration for all nodes needing to be accessed to a video monitoring network; step S2: designating any one node as a root node of the video monitoring network and connecting the root node with a router; the method is characterized by further comprising the following steps:
s3: if all nodes are added into the video monitoring network or the video monitoring network reaches the maximum running layer number, the video monitoring network is built; otherwise, the nodes send beacon frames to each other, except the root node, the node which fails to access the video monitoring network judges the preferred father node of the node according to the received beacon frames, sends connection request information to the preferred father node, and enters step S4;
s4: when the preferred father node in the step S3 receives the connection request information sent by the node in the step S3, if the preferred father node is positioned at the maximum allowable layer of the video monitoring network, the preferred father node is not allowed to be accessed, and the step S3 is repeated; otherwise, enter step S5;
s5: if the actual access quantity of the preferred father node is smaller than the maximum value of the accessible quantity, the preferred father node obtains the signal strength of the connection request information according to the received connection request information, selects the node with the maximum signal strength and with which the signal strength is larger than the access threshold value to be accessed, otherwise, the node is not allowed to be accessed, and the step S3 is repeated;
if the actual access number of the preferred father node is greater than or equal to the maximum value of the accessible number, the preferred father node obtains the minimum value of the signal intensity of the beacon frame which is accessed to the father node according to the beacon frame sent by the node, and meanwhile obtains the maximum value of the signal intensity of the connection request information according to the received connection request information, and then the step S6 is carried out;
s6: if the maximum value of the signal intensity of the connection request information is smaller than the minimum value of the signal intensity of the beacon frame, the existing connection state is kept unchanged, and the step S3 is repeated;
if the maximum value of the signal intensity of the connection request information is larger than the minimum value of the signal intensity of the beacon frame, the node which sends the connection request information and has the maximum signal intensity is accessed to the preferred father node, the node which sends the beacon frame and has the minimum signal intensity is disconnected with the preferred father node, all the lower nodes are disconnected, and the step S3 is repeated;
the beacon frame comprises a current node type, a current node layer number, a maximum layer number allowed by a network, the number of child nodes accessed to the current node, the maximum value of the accessible number of the current node and the signal intensity of the current node; the current node category comprises a root node, an intermediate node and a leaf node;
in step S3, all nodes failing to access the video monitoring network determine a preferred parent node of the node according to the received beacon frame, and send connection request information to the preferred parent node, which means that all nodes failing to access the video monitoring network select the preferred parent node according to the number of current node layers in the received beacon frame, the number of child nodes accessing the current node, and the signal strength of the current node; all nodes which fail to access the video monitoring network are used for preferentially selecting the node with the shallowest current node layer number as a preferred father node; if the number of the current node layers is a plurality of potential father nodes, selecting the node with the least number of the child nodes accessed to the current node as the preferred father node; if a plurality of potential father nodes exist in the current node layer number and the number of the child nodes accessed to the potential father nodes is the same, selecting the node with the maximum signal intensity of the current node as the preferred father node; if the number of the current node layers, the number of the child nodes accessed to the current node and the signal strength of the current node in each beacon frame are the same, one current node is randomly used as a preferred father node.
2. The method for dynamically constructing a video surveillance network according to claim 1, characterized in that the maximum value of the accessible number of the current nodes is 10 to 15.
3. The method for dynamically constructing a video surveillance network according to claim 1, wherein in the beacon frames sent by all nodes which cannot access the video surveillance network, the maximum value of the accessible number of the current node and the signal strength of the current node have values, and the remaining parameters are all null.
4. The method for dynamically constructing a video monitoring network according to claim 1, wherein after a node accesses a preferred parent node, the number of child nodes accessing a current node in a beacon frame sent by the preferred parent node is increased by 1; if the current node type in the beacon frame sent by the preferred father node is a root node or an intermediate node, the current node type is kept unchanged; if the current node type in the beacon frame sent by the preferred father node is a leaf node, setting the current node type as an intermediate node;
the maximum number of layers allowed by the network in the beacon frame sent by the node is consistent with the maximum number of layers allowed by the network in the beacon frame sent by the preferred father node; the number of the child nodes accessed to the current node in the beacon frame sent by the node is set to 0; the number of the current node layers in the beacon frame sent by the node is 1 added to the number of the current node layers in the beacon frame sent by the preferred father node; the current node type in the beacon frame sent by the node is set as the leaf node.
5. The method for dynamically constructing a video monitoring network according to claim 1, wherein after all lower nodes of the node are disconnected, the current node type, the current node layer number, the maximum layer number allowed by the network and the number of child nodes accessing the current node in the beacon frame sent by all lower nodes of the node are set to be null.
6. The method according to claim 1, wherein when the number of current node layers is equal to the maximum number of network allowed layers in all beacon frames received by all nodes that fail to access the video monitoring network, all nodes that fail to access the video monitoring network remain idle.
7. The method for dynamically constructing a video surveillance network according to claim 1, wherein the access threshold is from-85 dbm to-40 dbm.
8. The method for dynamically constructing a video monitoring network according to any one of claims 1 to 7, wherein the nodes each employ video monitoring equipment; the video monitoring equipment comprises a WIFI-MESH processing module, a UPS (uninterrupted Power supply) module, a power conversion module, an omnidirectional antenna module and a camera module, wherein the omnidirectional antenna module, the UPS module and the camera module are connected with the WIFI-MESH processing module, and the power conversion module is connected with the UPS module.
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