CN111935763A - Method and network system for improving data transmission reliability in wireless grid network - Google Patents
Method and network system for improving data transmission reliability in wireless grid network Download PDFInfo
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Abstract
The application discloses a method for improving data transmission reliability in a wireless Mesh network, wherein a Mesh of the wireless Mesh network comprises more than two Mesh entrance access nodes MPP which are accessed to an external network, one MPP node is a first MPP management node, and the method comprises the following steps that any Mesh access node MAP supporting an AP function: receiving a switching command from a first MPP management node, wherein the switching command carries target MPP node information to be switched, modifying a target address of a data stream with the received target address as the first MPP management node into a target MPP node according to the target MPP node information carried in the switching command, and transmitting the data stream based on the modified target address. The invention provides active switching and passive switching in a Mesh network with a plurality of outlets, and improves the reliability of data transmission.
Description
Technical Field
The present invention relates to the field of Mesh of wireless Mesh networks, and in particular, to a method for improving data transmission reliability in a wireless Mesh network.
Background
Mesh networks, i.e. "wireless Mesh networks", are a kind of "multi-hop" (multi-hop) networks, developed from ad-hoc networks. Each node in an ad-hoc network is mobile and can dynamically maintain connections with other nodes in any manner. In the process of network evolution, a wireless network is an indispensable technology, the wireless Mesh can cooperatively communicate with other networks to form a dynamic and continuously expandable network architecture, and wireless interconnection can be maintained between any two devices.
Referring to fig. 1, fig. 1 is a schematic diagram of a conventional Mesh networking. The network comprises a Mesh entry node (MPP, Mesh Portal Point), a Mesh node (MP, Mesh Point) and a Mesh Access MAP node (MAP, Mesh Access Point) supporting the AP function, wherein the MPP node is the extension of a traditional AP (AP, wireless Access node), one end of the MPP node is connected to the AP through a wired or wireless mode so as to be connected to the Internet, and the MPP node is an Access Point connecting a wireless Mesh network and a non-Mesh network and is also a control node of the whole Mesh network; the MP node supports the functions of automatic topology, automatic discovery of routing, forwarding of data packets and the like, and is used for connecting the MPP node, the MAP node and each MP node in the Mesh network; the MAP node is used for connecting with a terminal (station).
In the existing Mesh network, an external network is usually accessed through an MPP node, which results in that once the MPP node fails, the Mesh network where the MPP node is located cannot perform data transmission with the external network.
Disclosure of Invention
The invention provides a method for improving data transmission reliability in a wireless Mesh network, which aims to improve the transmission reliability between a Mesh network and an external network.
The invention provides a method for improving data transmission reliability in a wireless Mesh network, wherein a Mesh of the wireless Mesh network comprises more than two Mesh entrance access nodes MPP which are accessed to an external network, wherein one MPP node is a first MPP management node, the method comprises the following steps,
any Mesh access node MAP supporting the AP function:
receiving a switching command from a first MPP management node, wherein the switching command carries destination MPP node information to be switched,
modifying the received destination address of the data stream with the destination address as the first MPP management node into a destination MPP node according to destination MPP node information carried in the switching command,
and transmitting the data stream based on the modified destination address.
Preferably, the method further comprises the step of,
any MPP node:
receiving a handover command from a first MPP management node,
and judging whether the MPP node is the target MPP node or not according to the target MPP node information carried in the switching command, if so, taking the MPP node as a second MPP management node, and otherwise, sending the node information of the node to the target MPP node.
Preferably, the method further comprises the step of,
and when detecting that the terminal accessed to the MAP node has no data stream transmission within a set time threshold, the MAP node triggers the terminal to reconnect.
Each MAP node and each MPP node send heartbeat messages to a second MPP management node in a timed mode;
preferably, the MPP node is used as a second MPP management node,
starting the function of the DHCP server to become a second MPP management node,
receiving private messages from each MPP node, wherein the private messages carry node information of the private messages;
and sending the node information of all MPP nodes in the network to all MAP nodes and MPP nodes.
Preferably, the triggering the terminal to reconnect includes,
the MAP node kicks the terminal out of the network, so that the terminal acquires an IP address and an MPP node address from a second MPP management node after being reconnected to the network;
the node information comprises an IP address, an MAC address and a network index;
the switching command is triggered by the first MPP management node according to the network index of the first MPP management node, and after the switching command is sent, the first MPP management node closes the function of a Dynamic Host Configuration Protocol (DHCP) server;
the destination MPP node is determined by the first MPP management node selecting the MPP with the best network index from the network indexes of the MPP nodes.
Preferably, the transmitting node information of all MPP nodes in the network to all MAP nodes and MPP nodes further includes,
sorting according to network indexes in each MPP node information, sending each MPP node information and sorting results to all MPP nodes and MAP nodes,
preferably, the method further comprises the step of,
when any MPP node accesses the Mesh network, the MPP node sends DHCP detection,
it is determined whether there is a DHCP server in the Mesh network,
if yes, the node information of the MPP node is sent to the current management node through a private message, so that the current management node performs sequencing according to network indexes in each MPP node information to send each MPP node information and sequencing results to all MPP nodes and MAP nodes,
otherwise, the MPP node starts the function of a DHCP server and becomes the first MPP management node, IP addresses are distributed to all access point MP nodes, MAP nodes and terminals in the network, and the MPP node is distributed to the terminals.
Preferably, the method further comprises the step of,
when any MPP node and/or MAP node detects that the heartbeat is not communicated with the first MPP management node, the node selects the MPP with the best network index as the target MPP node.
The invention provides a wireless grid network system, wherein the wireless grid network Mesh system comprises more than two grid entrance access nodes MPP which are accessed to an external network, wherein one MPP node is a first MPP management node;
any MPP node receiving the handover command from the first MPP management node,
and modifying the received data stream with the destination address as the first MPP management node into the destination MPP node according to destination MPP node information carried in the switching command.
And transmitting the data stream based on the modified destination address.
Preferably, the at least one MPP node is,
receiving a switching command from a first MPP management node, wherein the switching command carries destination MPP node information to be switched,
and judging whether the MPP node is a target MPP node, if so, taking the MPP node as a second MPP management node, otherwise, sending node information of the node to the target MPP node.
In a Mesh network comprising more than two MPP nodes, any MAP node modifies the destination address of a data stream with the received destination address as the first MPP management node into a destination MPP node according to destination MPP node information carried in a switching command from the first MPP management node, and transmits the data stream based on the modified destination address. The MPP node with the best network index can be selected in real time for data stream transmission through switching of the MPP nodes during data stream transmission, and further, once the current management node is found to have a fault, the MPP node with the best network index can be switched to for data stream transmission, so that the problem that data transmission is carried out only by one MPP node in the existing Mesh network is avoided, and the reliability of data transmission is improved.
Drawings
Fig. 1 is a schematic diagram of a conventional Mesh networking.
Fig. 2 is a schematic diagram of a Mesh network configured with three MPP nodes in the Mesh network according to the present application.
Fig. 3 is a schematic flow chart of the MPP node accessing the Mesh network.
Fig. 4 is a schematic flow chart of the MPP management node active handover.
Fig. 5 is a schematic diagram of MPP node switching performed based on the networking of fig. 2 in this embodiment 1.
Fig. 6 is a schematic flow chart of the MPP management node passive handover.
Fig. 7 is a schematic diagram of MPP node switching performed based on the networking of fig. 2 in this embodiment 2.
Figure 8 is a schematic diagram of an MPP node with gateway capability
Fig. 9 is a diagram of a MAP node.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
In the Mesh network, at least more than two MPP nodes with gateway capability are configured, so that the Mesh network is provided with a plurality of outlets connected with an external network, and once any one of the MPP nodes fails, data stream transmission on the MPP node is switched to other non-failure MPP nodes in the Mesh network.
Referring to fig. 2, fig. 2 is a schematic diagram of a Mesh network configured with three MPP nodes in the Mesh network of the present application. Three MPP nodes are configured in the Mesh network, each MPP node is at least connected with one MP, in the graph, all the MP nodes are sequentially connected, and each MAP is connected with one MP node.
Among the MPP nodes, an MPP node can be designated as a management node through configuration. When a plurality of MPP nodes in the Mesh network are on-line, each MPP node sends a private message to a management node of the Mesh network to inform the MAC address and the IP address of the MPP node, so that the management node acquires information of all the MPP nodes in the Mesh network.
Referring to fig. 3, fig. 3 is a schematic flow chart of the MPP node accessing the Mesh network. After the MPP node with gateway capability is accessed into the Mesh network, sending Dynamic Host Configuration Protocol (DHCP) detection, and detecting whether a DHCP server exists in the Mesh network, namely, detecting whether the MPP node opens the function of the DHCP server;
if no DHCP server exists, the MPP node starts the function of the DHCP server to allocate IP addresses to the MP node, the MAP node of the whole network and the terminal accessing the network, and allocates the MPP node to the terminal, and the MPP node automatically becomes the management node of the MESH network.
If the network already has a DHCP server, it indicates that there is no management node in the network at this time, the MPP node does not start its DHCP server function, and at least sends its own IP and MAC to the MPP management node through a private message, preferably, network index information such as an external network bandwidth and an external network status can also be sent to the management node through a private message, preferably, the management node is notified through a private message when the subsequent network index information of itself changes, for example, an external network is interrupted or the external network status becomes poor, and thus, the management node will know information of all the MPP nodes in the entire network.
The MPP management node receives the private messages sent by each MPP node in the network, sorts the messages according to network indexes such as the bandwidth of an external network of each MPP node and/or the network condition, and sends MPP node information of the whole network and MPP node sorting results to other MPP nodes and MAP nodes in the network.
MPP nodes and MAP nodes in the network all send heartbeat messages to MPP management nodes at regular time, so that the MPP nodes and the MAP nodes know whether the MPP management nodes are on line or not.
In the multiple MPP nodes, an MPP node may also be selected as a management node through autonomous election. For example, when a plurality of MPP nodes in the Mesh network are online, each MPP node sends a private message to all nodes of the Mesh network to inform the MAC address, the IP address and the network index information of the MPP node, and for each MPP, the MPP node sorts the received MPP nodes according to the network index information so as to determine whether the network index information of the MPP node is the best, so that one MPP node with the best network index information is autonomously selected as a management node.
The following describes a method for performing handover when there are multiple MPP nodes in the network.
Example 1
In this embodiment, the MPP management node initiates switching, that is, the MPP management node finds that its own network index is deteriorated or there is an MPP node with a better network index and triggers switching to the target MPP node, for example, the MPP management node sends an external network abnormal interrupt or finds that there is an MPP node with a better bandwidth and network condition in the network, and then switches to the target MPP node with a better external network condition. The handover described above may be understood as an active handover. For convenience of description, the MPP management node initiating the handover is referred to as a first MPP management node, and the MPP management node as the target MPP node is referred to as a second MPP management node.
Referring to fig. 4, fig. 4 is a schematic flow chart of the MPP management node active switching according to this embodiment. The switching method comprises the following steps of,
step 401, the first MPP management node sends private messages to other MPP nodes and all MAP nodes in the network to notify the data stream to be switched to the designated destination MPP, that is, sends a switching command. And shuts down its DHCP server function.
Step 402, after each MPP receives the switching command, judging whether the destination MPP node is itself,
if the destination MPP node to be switched is the local node, the function of the DHCP server is started to automatically become a second MPP management node,
if the MPP information is not the node, a private message is sent to the destination node to inform the IP, the MAC address and the network index of the node, so that the destination MPP node can know the conditions of all MPP nodes of the whole network as a second MPP management node, and meanwhile, the second MPP management node can send the MPP information and the network index to all other MPP nodes and MAP nodes in the network in a sequencing mode.
Step 403, after receiving the switching command, the MAP node determines whether the destination address carried by the current data stream is the address of the first MPP management node, if so, modifies the destination MAC address of the data stream to the MAC address of the second MPP management node, and determines a forwarding path using the MPP node address as the destination address through MP node routing discovery calculation, and sends the data stream to the second MPP management node, so that the data stream is sent out from the second MPP management node.
And when the MAP node detects that no data stream is transmitted by the terminal within the set time threshold, the MAP node kicks the terminal out of the current Mesh network to trigger the terminal to reconnect to the network.
And after the terminal is reconnected to the network, the IP address and the MPP node are obtained from the second MPP management node, so that the data stream is transmitted through the second MPP management node.
And if the destination address carried by the data stream is not the address of the first MPP management node, the destination address of the data stream is not modified.
In step 404, each MPP node and MAP may send a heartbeat message to the second MPP management node at regular time to detect whether the second MPP management node is online.
Referring to fig. 5, fig. 5 is a schematic diagram of MPP node switching performed based on the networking of fig. 2 in this embodiment. In the figure, three MPP1 nodes with gateway capability, an MPP2 node and an MPP3 node, and network indexes of each MPP node are shown in the figure, wherein the MPP1 is a management node, the management node sorts other MPP nodes in the network according to the network indexes, and the management node MPP1 sends information of each node and a sorting result to the MPP2 node, the MPP3 node, the MAP1 node, the MAP2 node and the MAP3 node.
When the external network communication of the MPP1 node is abnormal, the MPP1 node starts to perform active switching, the MPP1 selects the MPP3 as a second MPP management node, the MPP1 informs MPP2, MPP3, MAP1, MAP2 and MAP3 nodes through private messages, the MPP3 node is informed to be switched to, a DHCP server of the MPP2 node is closed, and black thick lines are used for informing a switching command as shown in the figure.
The MPP node and the MAP node in the network receive the switching command to carry out the following processing:
MPP2 node: sending a private message to a second MPP management node MPP3 to inform the second MPP management node of network indexes, and simultaneously sending a heartbeat message to a MPP3 node at regular time;
MPP 3: starting a DHCP server function, receiving private messages sent by other MPPs, sequencing all the MPPs in the network according to network indexes, and sending sequencing results and address information to the MPP2 node and the MAP 1-MAP 3 nodes;
MAP 1: for a data stream sent by a terminal STA1 to an external network, if the destination MAC address of the data stream is the MAC address of a MAP1 node, the destination MAC of the data stream is modified to be the MAC address of an MPP3 node, a message is sent to an MP node connected with the MPP1 node, the MP node performs route discovery calculation, forwards the data stream to the MPP3 node, and sends the data stream to the external network from the MPP 3. If terminal STA1 is checked to have no data stream transmission within the time threshold, terminal STA1 is kicked off. The gateway to which the terminal STA1 is assigned after re-joining is the MPP3, so that the data stream is sent directly from the MPP3 without the MAP1 modifying the destination MAC address. At the same time the MAP1 begins timing the MPP3 to send heartbeats.
The actions of MAP2 and MAP3 are similar to MAP 1.
In the embodiment, the MPP management node actively initiates switching, so that the Mesh network can always select the MPP node with the best network index in real time to transmit data streams, thereby improving the reliability of data transmission and improving the transmission efficiency of data.
Example 2
In this embodiment, the switching is automatically triggered after the MPP manager drops the line, that is, when the MPP manager drops the line due to an abnormality (e.g., a power failure) in the network, the passive switching is triggered.
Referring to fig. 6, fig. 6 is a schematic flow chart of the MPP management node passive handover according to this embodiment. Before switching, the first MPP management node sends each node information and sequencing result to all MPP nodes and MAP nodes. The switching method comprises the following steps of,
step 601, when the MAP node and the MPP nodes except the management node find that the heartbeat with the MPP management node is not communicated, the MPP node and the MAP select the MPP with the best network index as the target MPP node according to the network index sequencing result,
step 602, each MPP determines whether the destination MPP node is itself,
if the MPP finds that the selected node is the MPP itself, the function of the DHCP server is started and becomes a second MPP management node,
if not, sending a private message to the second MPP management node selected in step 601 to inform the IP, MAC, and network index of the node, so that the second MPP management node knows all MPP conditions of the entire network;
step 603, the second MPP management node sorts all MPP nodes according to the network index, sends each MPP node information and sorting result to all other MPPs and MAPs in the network,
in step 604, the MAP node determines whether the destination address carried by the current data stream is the address of the first MPP management node,
if so, modifying the destination MAC address of the data stream into the MAC address of a second MPP management node, determining a forwarding path with the MPP node address as the destination address through MP node routing discovery calculation, and sending the data stream to the second MPP management node so as to enable the data stream to go out of the second MPP management node, thereby ensuring that the data stream sent to the external network after switching is not interrupted for the data stream of which the destination address is the first MPP management node and the terminal which is accessed before switching;
and when the MAP node detects that no data stream is transmitted by the terminal within the set time threshold, the MAP node kicks the terminal out of the current Mesh network to trigger the terminal to reconnect to the network.
And after the terminal is reconnected to the network, the IP address and the MPP node are obtained from the second MPP management node, so that the data stream is transmitted through the second MPP management node.
And if the destination address carried by the data stream is not the address of the first MPP management node, the destination address of the data stream is not modified.
Step 604 does not have a sequence with steps 602 and 603, and is processing performed on different nodes.
And step 605, each MPP and MAP sends heartbeat to a second MPP management node at regular time to detect whether the management node is on line or not.
Referring to fig. 7, fig. 7 is a schematic diagram of MPP node switching performed based on the networking of fig. 2 in this embodiment. In the figure, three MPP1 nodes with gateway capability, an MPP2 node and an MPP3 node, and network indexes of each MPP node are shown in the figure, wherein the MPP1 is a management node, the management node sorts other MPP nodes in the network according to the network indexes, and the management node MPP1 sends information of each node and a sorting result to the MPP2 node, the MPP3 node, the MAP1 node, the MAP2 node and the MAP3 node.
When the management node MPP1 is crashed abnormally, the MPP2, the MPP3, the MAP1, the MAP2 and the MAP3 nodes are not communicated with the MPP1, and each MPP node and each MAP node perform the following processing:
MPP2 node: and selecting the MPP3 node as a target MPP node and simultaneously as a second MMP management node from the MPP node information and the sequence sent by the MPP1 management node before the downtime. The MPP2 node sends the network index to MPP3, and sends heartbeat message to MPP3 at regular time;
MPP 3: from the MPP information and sequencing sent before the MPP1 management node goes down, the MPP3 node also selects an MPP3 node as a destination node, finds itself, then starts a DHCP server function, receives private messages sent by other MPPs, sequences the MPP nodes in the network, and sends the MPP2 and the MAP 1-MAP 3 (as a black solid line in the figure).
MAP 1: selecting an MPP3 node as a target node from MPP node information and sequencing sent by an MPP1 management node before downtime; for a data stream sent by a terminal STA1 to an external network, if the destination MAC address of the data stream is the MAC address of a MAP1 node, the destination MAC of the data stream is modified to be the MAC address of an MPP3 node, a message is sent to an MP node connected with the MPP1 node, the MP node performs route discovery calculation, forwards the data stream to the MPP3 node, and sends the data stream to the external network from the MPP 3. If terminal STA1 is checked to have no data stream transmission within the time threshold, terminal STA1 is kicked off. The gateway to which the terminal STA1 is assigned after re-joining is the MPP3, so that the data stream is sent directly from the MPP3 without the MAP1 modifying the destination MAC address. At the same time the MAP1 begins timing the MPP3 to send heartbeats.
The actions of MAP2 and MAP3 are similar to MAP 1.
In this embodiment, when the first MPP management node is detected to be abnormal by other MPP nodes and MAP nodes, the other MPP nodes and MAP nodes autonomously select the MPP node with the best network index as the target node for switching, which avoids interruption of data stream transmission caused by abnormality of the first MPP management node, and improves robustness and reliability of data stream transmission.
Referring to fig. 8, fig. 8 is a schematic diagram of an MPP node with gateway capabilities. The MPP node includes a plurality of MPP nodes,
the switching module triggers switching according to the network indexes of all MPP nodes in the current Mesh network or when heartbeat messages are abnormal, and takes the MPP node with the best network index as a switching target MPP node;
the gateway module is used for judging whether the target MPP node is the target MPP node, starting a dynamic host configuration protocol server function to serve as a management node when the target MPP node is the target MPP node, receiving private messages from other MPP nodes with gateway capability, acquiring address information of the other MPP nodes, and sending the information of each MPP node to all the MPP nodes and the MAP nodes; when the destination MPP node is not the MPP node, sending a private message to the destination MPP node, wherein the message carries the node information of the node and the network index, sending a heartbeat message to the destination MPP node at regular time,
and the forwarding module receives the data stream with the MPP node as a destination address and transmits the data stream between the Mesh network and an external network.
As another implementation manner, the MPP node includes a memory and a processor, where the memory stores a computer program, and the processor is configured to execute the computer program, so as to implement the traffic load sharing methods in embodiments 1 to 4 of the present application.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
Referring to fig. 9, fig. 9 is a schematic diagram of a MAP node. The MAP node includes a MAP of the plurality of nodes,
a switching module for receiving the switching command, modifying the data stream with the source MPP node (first MPP management node) as the destination address to the destination MPP address according to the destination MPP address in the switching command,
an access control module which triggers the reconnection of the terminal when no data stream from the terminal is transmitted within a set time threshold,
and the transceiving module is used for sending the data stream from the terminal to the connected MP node according to the destination address of the data stream and sending the heartbeat message to the management node at regular time.
The switching module further comprises an MPP node with the best network index as a switching target MPP node when the heartbeat of the MPP management node is not communicated with the MPP management node.
The embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method steps for improving the reliability of data transmission of the above embodiments are implemented.
For the device/network side device/storage medium embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant points, refer to the partial description of the method embodiment.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for improving data transmission reliability in a wireless Mesh network, wherein a Mesh of the wireless Mesh network comprises more than two Mesh entrance access nodes MPP accessing an external network, wherein one MPP node is a first MPP management node, the method comprises,
any Mesh access node MAP supporting the AP function:
receiving a switching command from a first MPP management node, wherein the switching command carries destination MPP node information to be switched,
modifying the received destination address of the data stream with the destination address as the first MPP management node into a destination MPP node according to destination MPP node information carried in the switching command,
and transmitting the data stream based on the modified destination address.
2. The method of claim 1, wherein the method further comprises,
any MPP node:
receiving a handover command from a first MPP management node,
and judging whether the MPP node is the target MPP node or not according to the target MPP node information carried in the switching command, if so, taking the MPP node as a second MPP management node, and otherwise, sending the node information of the node to the target MPP node.
3. The method of claim 1, wherein the method further comprises,
when detecting that no data stream is transmitted by a terminal accessed to the MAP node within a set time threshold, the MAP node triggers the terminal to reconnect;
and each MAP node and each MPP node send heartbeat messages to the second MPP management node in a timing manner.
4. The method of claim 2, wherein the MPP node comprises as a second MPP management node,
starting the function of the DHCP server to become a second MPP management node,
receiving private messages from each MPP node, wherein the private messages carry node information of the private messages;
and sending the node information of all MPP nodes in the network to all MAP nodes and MPP nodes.
5. The method of claim 3, wherein said triggering the terminal to reconnect comprises,
the MAP node kicks the terminal out of the network, so that the terminal acquires an IP address and an MPP node address from a second MPP management node after being reconnected to the network;
the node information comprises an IP address, an MAC address and a network index;
the switching command is triggered by the first MPP management node according to the network index of the first MPP management node, and after the switching command is sent, the first MPP management node closes the function of a Dynamic Host Configuration Protocol (DHCP) server;
the destination MPP node is determined by the first MPP management node selecting the MPP with the best network index from the network indexes of the MPP nodes.
6. The method of claim 5, wherein the transmitting node information for all MPP nodes in the network to all MAP nodes and MPP nodes further comprises,
and sequencing according to the network indexes in each MPP node information, and sending each MPP node information and a sequencing result to all MPP nodes and MAP nodes.
7. The method of claim 5, wherein the method further comprises,
when any MPP node accesses the Mesh network, the MPP node sends DHCP detection,
it is determined whether there is a DHCP server in the Mesh network,
if yes, the node information of the MPP node is sent to the current management node through a private message, so that the current management node performs sequencing according to network indexes in each MPP node information to send each MPP node information and sequencing results to all MPP nodes and MAP nodes,
otherwise, the MPP node starts the function of a DHCP server and becomes the first MPP management node, IP addresses are distributed to all access point MP nodes, MAP nodes and terminals in the network, and the MPP node is distributed to the terminals.
8. The method of claim 6 or 7, further comprising,
when any MPP node and/or MAP node detects that the heartbeat is not communicated with the first MPP management node, the MPP node with the best network index is selected as the target MPP node by the node.
9. A wireless grid network system is characterized in that the wireless grid network Mesh system comprises more than two grid entrance access nodes MPP which are accessed to an external network, wherein one MPP node is a first MPP management node;
any MPP node receiving the handover command from the first MPP management node,
modifying the received destination address of the data stream with the destination address as the first MPP management node into a destination MPP node according to destination MPP node information carried in the switching command,
and transmitting the data stream based on the modified destination address.
10. The system of claim 9, wherein any one of the MPP nodes,
receiving a switching command from a first MPP management node, wherein the switching command carries destination MPP node information to be switched,
and judging whether the MPP node is a target MPP node, if so, taking the MPP node as a second MPP management node, otherwise, sending node information of the node to the target MPP node.
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