CN113055975A - Remote wireless access automatic cascade method and system - Google Patents
Remote wireless access automatic cascade method and system Download PDFInfo
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- CN113055975A CN113055975A CN201911385353.7A CN201911385353A CN113055975A CN 113055975 A CN113055975 A CN 113055975A CN 201911385353 A CN201911385353 A CN 201911385353A CN 113055975 A CN113055975 A CN 113055975A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Abstract
The invention discloses a remote wireless access automatic cascade method and a system, wherein a work station node scans the signal intensity of a wireless access point, when the signal intensity is more than or equal to a first threshold value, the work station node is connected with the wireless access point, the self state is set to be connected, meanwhile, the work station node is converted into a cascade mode node, and a wireless broadcast carrying a self service set identifier is sent outwards, so that other work station nodes which are not connected are cascaded with the work station node, the wireless access distance is expanded, and automatic cascade is realized. The technical scheme of the invention realizes the wireless automatic access of the remote workstation node and reduces the networking cost.
Description
Technical Field
The invention belongs to the technical field of automatic networking, and particularly relates to a remote wireless access automatic cascade method and system.
Background
The Wi-Fi wireless communication technology widely used at present is a wireless local area network technology established in IEEE 802.11 standard, and generally includes a wireless access point AP and a plurality of station nodes STA (or called clients) to implement data interaction through wireless communication. Wi-Fi wireless communication technologies tend to have short communication distances due to limitations in wireless signal strength. If the distance between the AP and the STA is long or there are many obstacles between the AP and the STA, communication obstacles between the AP and the STA may be caused. When the signal coverage of the wireless access point is limited or the signal passing through two walls becomes very weak, the network can be expanded through a wireless bridging or wireless relay mode, so that the wireless signal is enhanced, and the wireless network coverage is further expanded.
As shown in fig. 1, in a networking system including an AP node and a plurality of STA nodes, each STA node needs to perform data interaction with the AP node through wireless Wi-Fi. However, the distance between some STAs and the AP is long, which causes the wireless transmission capability to be weakened, and affects data interaction.
In the first solution, if the AP and a station STA1 are far away from each other or an obstacle exists to affect the communication between the AP and the station STA1, a station STA2 may be added between the AP and the station STA1, the operating mode of the station STA2 is the bridge mode, and the mode is switched between the client mode and the access point mode. When STA2 is in access point mode, STA1 connects to STA2 and transmits data to STA 2; when STA2 is in client mode, it connects to the AP and transmits its own data along with STA1 data to the AP. Similarly, the data of the AP may be transmitted to the STA1 in the above manner.
The second scheme is solved by wireless relay, and a repeater can be added between the AP and the STA1, the repeater is divided into two parts, namely A and B, the A and the AP keep communication, and the B and the STA1 keep communication, so that data communication between the AP and the STA1 can be kept in real time.
However, the above technical solutions all require STA configuration, and general users do not have professional skills, which causes inconvenience for users. Moreover, the repeater has two wireless transceiving devices, and the cost is high.
Disclosure of Invention
The application aims to provide a remote wireless access automatic cascade method and a remote wireless access automatic cascade system to help a user to establish a network, so that an STA (station) far away from an AP (access point) can be quickly accessed to the network, the networking of the user is facilitated, and the networking cost is reduced.
In order to achieve the purpose, the technical scheme of the application is as follows:
a remote wireless access automatic cascade method is used for realizing wireless access of remote workstation nodes, and comprises the following steps:
step 1, all work station nodes scan wireless broadcasts of wireless access points, if the signal intensity between the work station nodes and the wireless access points is larger than or equal to a first threshold value, the work station nodes are directly connected with the wireless access points, the states of the work station nodes are set to be connected, the cascade stages of the work station nodes are updated to be one stage, and otherwise, the work station nodes are set to be unconnected;
step 2, for the workstation nodes with the connected states, the working modes are converted into cascade modes one by one, the cascade modes are used as the cascade mode nodes to send wireless broadcasts outwards, the workstation nodes in the unconnected states scan the wireless broadcasts of the cascade mode nodes one by one, and the signal intensity between the workstation nodes and the cascade mode nodes and the cascade stages of the cascade mode nodes are recorded;
step 3, the workstation nodes in the unconnected state compare the recorded signal intensity among all the cascade mode nodes and the cascade progression of each cascade mode node, select the cascade mode nodes of which the signal intensity is more than or equal to a first threshold value and the cascade progression meets the cascade strategy to carry out wireless connection, set the self state as connected, and update the self cascade progression to add one to the cascade progression of the connected cascade mode nodes;
and 4, if the workstation nodes in the unconnected state exist, continuing to execute the step 2 and the step 3 until a termination condition is reached.
Further, the step of converting the working mode into the cascade mode one by one for the station nodes whose own states are connected, and sending out a radio broadcast as the cascade mode node includes:
setting a first threshold value of the cascade time, setting the first threshold value as connected state, starting timing when the working mode is converted into the cascade mode, and sending wireless broadcast outwards as a node of the cascade mode;
when the timing reaches a first threshold value of the cascade time, if the wireless connection between the self and other workstation nodes is established, the self continues to work in the cascade mode, otherwise, the working mode is converted into the workstation mode.
Furthermore, the wireless access points and the workstation nodes are provided with node lists, and the node lists record information of the wireless access points and all the workstation nodes participating in networking.
Further, the selecting the node in the cascade mode, the intensity of which is greater than or equal to the first threshold value and the cascade progression of which satisfies the cascade strategy, to perform wireless connection further includes:
and further judging whether the cascade mode node is in a node list or not, and if the cascade mode node is in the node list, connecting the cascade mode node.
The application also provides a remote wireless access automatic cascade system for realizing wireless access of remote workstation nodes, the remote wireless access automatic cascade system comprises a wireless access point and a workstation node, wherein:
all the workstation nodes scan the wireless broadcast of the wireless access point, if the signal intensity between the workstation nodes and the wireless access point is greater than or equal to a first threshold value, the workstation nodes are directly connected with the wireless access point, the self state is set to be connected, the cascade stage number of the workstation nodes is updated to be one stage, and otherwise, the workstation nodes are set to be unconnected;
for the workstation nodes with the connected states, the working modes are converted into the cascade mode one by one and used as the cascade mode nodes to send wireless broadcasts outwards, the workstation nodes in the unconnected states scan the wireless broadcasts of all the cascade mode nodes one by one, and the signal intensity between the workstation nodes and all the cascade mode nodes and the cascade stages of all the cascade mode nodes are recorded;
the workstation node in the unconnected state compares the recorded signal intensity among all the cascade mode nodes and the cascade progression of each cascade mode node, selects the cascade mode node with the signal intensity more than or equal to a first threshold value and the cascade progression meeting the cascade strategy to carry out wireless connection, sets the self state as connected, and updates the cascade progression of the self to be the cascade progression of the connected cascade mode node plus one;
and when the recorded signal intensity between the workstation node and each cascade mode node is smaller than a first threshold value, judging whether a termination condition is reached, and terminating scanning when the termination condition is reached.
According to the remote wireless access automatic cascade method and system, the workstation nodes scan the signal intensity of the wireless access points, when the signal intensity is larger than or equal to a first threshold value, the wireless access points are connected, the states of the workstation nodes are set to be connected, meanwhile, the workstation nodes are converted into cascade mode nodes, wireless broadcasts carrying self service set identifiers are sent outwards, other unconnected workstation nodes are cascaded with the workstation nodes conveniently, the wireless access distance is expanded, and automatic cascade is achieved. According to the technical scheme, wireless automatic access of the remote workstation nodes is achieved, and networking cost is reduced.
Drawings
FIG. 1 is a diagram illustrating a wireless network architecture according to the background art;
fig. 2 is a flowchart of an automatic cascade method for long-distance wireless access according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a long-range wireless access automatic cascade networking according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 2, there is provided a long-range wireless access automatic concatenation method, including:
and step S1, all the workstation nodes scan the wireless broadcast of the wireless access point, if the signal intensity between the workstation nodes and the wireless access point is greater than or equal to a first threshold value, the workstation nodes are directly connected with the wireless access point, the self state is set to be connected, the cascade stage number of the workstation nodes is updated to be one stage, and otherwise, the workstation nodes are set to be unconnected.
Wi-Fi wireless communication technology is a relatively mature wireless communication technology, and a station node STA accesses a wireless access point AP to realize wireless communication. The access process between the wireless access point AP and the workstation node STA can be an active mode and a passive mode, wherein the active mode is that the workstation node STA actively sends a Probe Request message of a Probe Request frame to Probe the wireless access point AP; the passive mode is that the station node STA listens to a Beacon frame (Beacon frame) sent by the wireless access point AP to implement wireless access.
In the method, a passive mode is adopted, the station node STA monitors a broadcast message (namely a Beacon frame) sent by the wireless access point AP, the broadcast message carries a Service Set Identifier (SSID) of the AP, and the station node STA can acquire the SSID and the signal intensity of the AP by scanning an air wireless signal.
In step S1, the wireless access point AP sends a wireless broadcast, all devices serving as the station node STA scan a wireless broadcast signal, the signal strength near the wireless access point AP is high, and the signal strength far away from the wireless access point AP or blocked by an obstacle is low, at this time, the station node STA compares the signal strength with a set first threshold, if the signal strength is greater than or equal to the first threshold, the wireless access point is directly connected, and the state of the station node STA is set as connected, otherwise, the station node STA is set as unconnected.
Each station node STA records the following state table:
TABLE 1
For example, the wireless access point AP sends a wireless broadcast carrying its own service set identifier SSID0, all STAs scan the wireless broadcast of the wireless access point AP to obtain the signal strength with the wireless access point AP, and if the signal strength is less than a first threshold (R1), the wireless access point AP is not connected; if the signal strength is greater than or equal to the first threshold (R1), the wireless access point AP is directly connected.
In this embodiment, if a wireless access point AP is already connected, each station node STA sets its own state as connected, that is, X is 0, and sets the cascade stage Y as 1; if the wireless access point AP is not connected, the state of the wireless access point AP is set to be unconnected, that is, X is 1, and the cascade number Y is an initial value and null.
It should be noted that, a wireless device operating in the station mode is a station node, and operating in the AP mode is a wireless access point. The wireless access point AP always works in a wireless access point mode, namely the AP mode. The STA can work in a station mode and a cascade mode, and when the STA works in the cascade mode, the STA is called a cascade mode node.
The station node in this embodiment may be applied as a cascade mode node, and for a connected station node STA, an original station mode is modified into a cascade mode, which is called a cascade mode node, and when the cascade mode node in this embodiment performs networking, the cascade mode node broadcasts an own broadcast packet (i.e., Beacon frame) outwards, where the broadcast packet carries an own Service Set Identifier (SSID), and takes the SSID of STA1 as SSID1 as an example, and the broadcast packet carries SSID 1. When other work station nodes STA scan the broadcast message, wireless connection can be established with the broadcast message, and at the moment, the cascade mode node forwards the data message and accesses the other work station nodes STA connected to the cascade mode node STA into the network.
And step S2, for the workstation nodes with the connected state, the workstation nodes convert the working modes into the cascade mode one by one, the workstation nodes serve as the cascade mode nodes to send out wireless broadcast, the workstation nodes in the unconnected state scan the wireless broadcast of each cascade mode node one by one, and the signal intensity between the workstation nodes and each cascade mode node and the cascade stage number of each cascade mode node are recorded.
In step S2, if the self status is the connected station node, the working mode is converted into the cascade mode, and the node serving as the cascade mode sends out the radio broadcast carrying the self service set identifier and carrying the cascade stage information of the self. And other non-connected working station nodes STA scan the air wireless broadcast to obtain the signal intensity between each cascade mode node and the cascade stage number of each cascade mode node.
For example, the STA node STA4 is in an unconnected state, and the STA1, STA2 and STA3 are all cascade mode nodes, and after scanning, the STA4 records the signal strength and the cascade number of the STA1, STA2 and STA 3.
And step S3, the workstation node in the unconnected state compares the recorded signal intensity among the cascade mode nodes and the cascade stage number of each cascade mode node, selects the cascade mode node of which the signal intensity is greater than or equal to the first threshold value and the cascade stage number meets the cascade strategy to carry out wireless connection, sets the self state as connected, and updates the cascade stage number of the workstation node to be the cascade stage number of the connected cascade mode node plus one.
In this step, STA4 compares the recorded signal strengths of STA1, STA2, and STA3 with the cascade stage number, and if the signal strength is less than the first threshold (R1), the corresponding cascade mode node is not connected; if the signal strength is greater than or equal to the first threshold (R1), the cascade stages are further compared.
In an embodiment of the present application, if the cascade policy is the shortest path, the cascade mode node with the minimum cascade stage number is selected to perform wireless connection when the signal strength is greater than or equal to the first threshold (R1).
It is easy to understand that the cascading strategy is formulated according to each different scenario, for example, a cascading mode node with the minimum cascading number or the next minimum cascading number may also be selected, and then the wireless access with the large signal strength is selected, which is not limited in the present application.
In this embodiment, once the workstation node is connected to the tandem mode node, the workstation node sets its own state as connected, and then becomes the tandem mode node, and similarly, the workstation node may send out a radio broadcast as the tandem mode node. And updating the cascade stage number of the self to be the cascade stage number of the connected cascade mode node plus one.
For example, STA4 is connected to STA1, and if the number of cascade stages of STA1 is originally 1, STA4 sets its own number of cascade stages to 2.
If STA3 is connected to STA4, and the cascade stage number of STA3 is originally 2, STA4 sets its cascade stage number to 3.
Step S4, if there are any workstation nodes in the unconnected state, the steps S2 and S3 are continued until the termination condition is reached.
It is easy to understand that after the above steps, it is not excluded that there are also station nodes STA not connected to the network, but a group of station nodes already connected to the tandem mode node and changing themselves to the connected state to become the tandem mode node.
At this time, only the step S2 and the step S3 need to be executed continuously, and the wireless network can be extended continuously by repeating the steps, so as to realize automatic networking. The termination condition of this embodiment may be time, that is, a period of networking, for example, five minutes, during which it is generally considered that networking is completed, and if there are unconnected workstation nodes, the distance is too far away to connect. Or a signal intensity threshold value can be set, and networking cannot be performed any more if the scanned signal intensity is always smaller than the signal intensity threshold value.
In an embodiment of the present application, for a station node whose own state is connected, a working mode is converted into a cascade mode one by one, and the station node serving as the cascade mode node sends out a radio broadcast, including:
setting a first threshold value of the cascade time, setting the first threshold value as connected state, starting timing when the working mode is converted into the cascade mode, and sending wireless broadcast outwards as a node of the cascade mode;
when the timing reaches a first threshold value of the cascade time, if the wireless connection between the self and other workstation nodes is established, the self continues to work in the cascade mode, otherwise, the working mode is converted into the workstation mode.
Taking STA1 as an example, the service set identifier SSID is SSID1, and after scanning the wireless broadcast of the wireless access point AP, the STA connects to the wireless access point AP and sets its own state as connected, at this time, the operating mode is switched from the station mode to the tandem mode, which becomes a tandem mode node.
And starting to count time, and sending out a wireless broadcast carrying the SSID 1.
The unconnected workstation node STA4 scans the radio broadcast of STA1, acquires the signal strength with STA1, and if the signal strength is less than the first threshold (R1), then STA1 is not connected; if the signal strength is greater than or equal to the first threshold (R1) and the cascade stage number is the smallest, the STA1 is directly connected.
When the timing reaches the first threshold value of the cascade time, if the STA1 is taken as a cascade mode node and has established wireless connection with other workstation nodes, the STA continues to work in the cascade mode, otherwise, the STA1 converts the self working mode from the cascade mode to the workstation mode.
For example, if STA4 is connected to STA1, STA1 would subsequently operate in tandem mode, responsible for cascading APs with STA 4.
On the other hand, if STA1 is already the outermost node and no further tandem station node is connected to STA1, it may operate in the station mode.
It should be noted that the first threshold of the cascade time may not be set, that is, the workstation nodes all operate in the cascade mode as long as the workstation nodes are in the connected state, and thus the cascade networking is performed, except that the outermost workstation node STA also operates in the cascade mode as long as it is connected to the internet.
Through the mode, outward extension is carried out step by step, the first threshold value of the cascade time is set in the embodiment, when the state X of the workstation node just becomes 0, the workstation node enters the cascade mode, the SSID of the workstation node is broadcasted outwards, the cascade quantity is increased continuously, and one stage of the workstation node is extended outwards.
In one embodiment, a node list is set in a wireless access point and a workstation node, and the node list records information of the wireless access point and all the workstation nodes participating in networking.
As shown in the following table:
TABLE 2
In this embodiment, the node information includes a node name, an SSID of the node, and a wireless password, so that each workstation node can be conveniently connected to the wireless access point AP directly or connected to a node operating in the cascade mode.
Further, the selecting the node in the cascade mode, the intensity of which is greater than or equal to the first threshold value and the cascade progression of which satisfies the cascade strategy, to perform wireless connection further includes:
and further judging whether the cascade mode node is in a node list or not, and if the cascade mode node is in the node list, connecting the cascade mode node.
The embodiment can prevent the workstation node from being interfered by an irrelevant wireless access point, and ensure that wireless access is carried out only when the workstation node is in the node list. Meanwhile, relevant information of all nodes in the network, including node names, SSIDs of the nodes and wireless passwords, is written into each workstation node, so that the workstation nodes can log in quickly without inputting passwords manually. Even if the irrelevant wireless access point is scanned, the connection is not automatically carried out, and the situation that the irrelevant wireless access point is scanned and is wrongly connected to the irrelevant wireless access point is avoided.
According to the technical scheme, the automatic cascade connection can be realized for the packaged products with the Wi-Fi function without manual configuration of customers. The application expands the range of the use area of the Wi-Fi suit type product, and automatic wireless cascade can be realized even in the place where the AP wireless signal cannot be directly covered. In addition, by adopting the technical scheme, the remote signals can be transmitted to the wireless access point AP without a relay, so that the networking cost is reduced. Theoretically, as long as the signal strength between the stations is enough, the stations can be cascaded infinitely.
As shown in fig. 3, in an embodiment, a long-distance wireless access automatic cascade system is used for implementing wireless access of a long-distance workstation node, and the long-distance wireless access automatic cascade system includes a wireless access point and a workstation node, wherein:
all the workstation nodes scan the wireless broadcast of the wireless access point, if the signal intensity between the workstation nodes and the wireless access point is greater than or equal to a first threshold value, the workstation nodes are directly connected with the wireless access point, the self state is set to be connected, the cascade stage number of the workstation nodes is updated to be one stage, and otherwise, the workstation nodes are set to be unconnected;
for the workstation nodes with the connected states, the working modes are converted into the cascade mode one by one and used as the cascade mode nodes to send wireless broadcasts outwards, the workstation nodes in the unconnected states scan the wireless broadcasts of all the cascade mode nodes one by one, and the signal intensity between the workstation nodes and all the cascade mode nodes and the cascade stages of all the cascade mode nodes are recorded;
the workstation node in the unconnected state compares the recorded signal intensity among all the cascade mode nodes and the cascade progression of each cascade mode node, selects the cascade mode node with the signal intensity more than or equal to a first threshold value and the cascade progression meeting the cascade strategy to carry out wireless connection, sets the self state as connected, and updates the cascade progression of the self to be the cascade progression of the connected cascade mode node plus one;
and when the recorded signal intensity between the workstation node and each cascade mode node is smaller than a first threshold value, judging whether a termination condition is reached, and terminating scanning when the termination condition is reached.
For a specific limitation of the long-range radio access automatic cascade system in this embodiment, reference may be made to the above limitation on an automatic cascade method for long-range radio access, which is not described herein again.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A remote wireless access automatic cascade method is used for realizing wireless access of remote workstation nodes, and is characterized in that the remote wireless access automatic cascade method comprises the following steps:
step 1, all work station nodes scan wireless broadcasts of wireless access points, if the signal intensity between the work station nodes and the wireless access points is larger than or equal to a first threshold value, the work station nodes are directly connected with the wireless access points, the states of the work station nodes are set to be connected, the cascade stages of the work station nodes are updated to be one stage, and otherwise, the work station nodes are set to be unconnected;
step 2, for the workstation nodes with the connected states, the working modes are converted into cascade modes one by one, the cascade modes are used as the cascade mode nodes to send wireless broadcasts outwards, the workstation nodes in the unconnected states scan the wireless broadcasts of the cascade mode nodes one by one, and the signal intensity between the workstation nodes and the cascade mode nodes and the cascade stages of the cascade mode nodes are recorded;
step 3, the workstation nodes in the unconnected state compare the recorded signal intensity among all the cascade mode nodes and the cascade progression of each cascade mode node, select the cascade mode nodes of which the signal intensity is more than or equal to a first threshold value and the cascade progression meets the cascade strategy to carry out wireless connection, set the self state as connected, and update the self cascade progression to add one to the cascade progression of the connected cascade mode nodes;
and 4, if the workstation nodes in the unconnected state exist, continuing to execute the step 2 and the step 3 until a termination condition is reached.
2. The method according to claim 1, wherein said step of switching the working mode to the cascade mode one by one for the station nodes whose own status is connected, and sending out the radio broadcast as the cascade mode node comprises:
setting a first threshold value of the cascade time, setting the first threshold value as connected state, starting timing when the working mode is converted into the cascade mode, and sending wireless broadcast outwards as a node of the cascade mode;
when the timing reaches a first threshold value of the cascade time, if the wireless connection between the self and other workstation nodes is established, the self continues to work in the cascade mode, otherwise, the working mode is converted into the workstation mode.
3. A long-distance wireless access automatic cascading method as claimed in any one of claims 1-2, wherein the wireless access points and the workstation nodes are provided with a node list, and the node list records information of the wireless access points and all the workstation nodes participating in networking.
4. The method according to claim 3, wherein the cascade mode nodes whose signal strength is greater than or equal to the first threshold and whose cascade progression satisfies the cascade strategy are selected for wireless connection, further comprising:
and further judging whether the cascade mode node is in a node list or not, and if the cascade mode node is in the node list, connecting the cascade mode node.
5. A remote wireless access automatic cascade system for realizing wireless access of remote workstation nodes, characterized in that the remote wireless access automatic cascade system comprises wireless access points and workstation nodes, wherein:
all the workstation nodes scan the wireless broadcast of the wireless access point, if the signal intensity between the workstation nodes and the wireless access point is greater than or equal to a first threshold value, the workstation nodes are directly connected with the wireless access point, the self state is set to be connected, the cascade stage number of the workstation nodes is updated to be one stage, and otherwise, the workstation nodes are set to be unconnected;
for the workstation nodes with the connected states, the working modes are converted into the cascade mode one by one and used as the cascade mode nodes to send wireless broadcasts outwards, the workstation nodes in the unconnected states scan the wireless broadcasts of all the cascade mode nodes one by one, and the signal intensity between the workstation nodes and all the cascade mode nodes and the cascade stages of all the cascade mode nodes are recorded;
the workstation node in the unconnected state compares the recorded signal intensity among all the cascade mode nodes and the cascade progression of each cascade mode node, selects the cascade mode node with the signal intensity more than or equal to a first threshold value and the cascade progression meeting the cascade strategy to carry out wireless connection, sets the self state as connected, and updates the cascade progression of the self to be the cascade progression of the connected cascade mode node plus one;
and when the recorded signal intensity between the workstation node and each cascade mode node is smaller than a first threshold value, judging whether a termination condition is reached, and terminating scanning when the termination condition is reached.
6. The long-range wireless access automatic cascade system according to claim 5, wherein said step of switching the operation mode to the cascade mode one by one for the workstation node whose own status is connected, and sending out the radio broadcast as the cascade mode node comprises:
setting a first threshold value of the cascade time, setting the first threshold value as connected state, starting timing when the working mode is converted into the cascade mode, and sending wireless broadcast outwards as a node of the cascade mode;
when the timing reaches a first threshold value of the cascade time, if the wireless connection between the self and other workstation nodes is established, the self continues to work in the cascade mode, otherwise, the working mode is converted into the workstation mode.
7. A long-distance wireless access automatic cascade system according to any of claims 5-6, wherein the wireless access points and the workstation nodes are provided with a node list, and the node list records information of the wireless access points and all the workstation nodes participating in networking.
8. The system according to claim 7, wherein said cascade mode nodes whose signal strength is greater than or equal to a first threshold and whose cascade progression satisfies a cascade strategy are selected for wireless connection, further comprising:
and further judging whether the cascade mode node is in a node list or not, and if the cascade mode node is in the node list, connecting the cascade mode node.
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