CN111417103A - System and method for realizing W L AN seamless roaming based on multiple radio frequencies - Google Patents
System and method for realizing W L AN seamless roaming based on multiple radio frequencies Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/54—Organization of routing tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/34—Modification of an existing route
- H04W40/36—Modification of an existing route due to handover
Abstract
The invention provides a system for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized by comprising a data proxy forwarding module, a roaming control module and a plurality of radio frequency modules on STA, wherein the data proxy module directly changes the interface of proxy forwarding data in a mode of modifying a strategy routing table and AN ARP table.
Description
Technical Field
The invention relates to the field of W L AN seamless roaming, in particular to W L AN seamless roaming realized based on multiple radio frequencies.
Background
W L AN (Wireless L AN, Wireless local area network) seamless roaming refers to a behavior that when AN STA (Station, Wireless client Station) moves between coverage areas of different APs (access points), user service is kept uninterrupted and data transmission is not delayed.
(1) IEEE802.11R- -this is a fast roaming protocol, deployed on both the STA and the AP. This protocol reduces the time required for authentication while roaming, reducing the roaming authentication time from a few hundred milliseconds to around 50 milliseconds. Generally applied to household products.
(2) AC (access controller) + AP- - -seamless roaming dominated by AC, different manufacturers have different implementation schemes, and the roaming time is within hundred milliseconds. The method is generally applied to enterprise-level products.
These two techniques have a delay of several tens of milliseconds in roaming, and are not strictly true seamless roaming.
Disclosure of Invention
In order to solve the above problems, the present invention provides a system and method for implementing W L AN seamless roaming based on multiple radio frequencies, which consumes less time for roaming.
Another object of the present invention is to provide a system and method for implementing W L AN seamless roaming based on multiple radio frequencies without disconnecting and reestablishing data connection during roaming and without performing ARP learning again.
In order to achieve the above object, the present invention has the following technical means.
The invention provides a system for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized in that the system comprises a data proxy forwarding module, a roaming control module, a plurality of radio frequency modules on STA and more than one AP;
a plurality of radio frequency modules: one radio frequency module is responsible for data transmission with the AP, and the other radio frequency modules are responsible for scanning and associating the AP with better signal quality;
the data proxy forwarding module: the STA is responsible for data communication between the STA and the AP;
a roaming control module: and the data proxy forwarding module is used for selecting the radio frequency module meeting the conditions and realizing data communication with the corresponding AP.
The data agent module changes the interface of agent forwarding data directly by modifying the strategy routing table and the ARP table. The modules are arranged, so that data connection is not required to be disconnected and reestablished in the roaming process, ARP learning is not required to be carried out again, the actual test roaming time is less than 0.01 millisecond, and real seamless roaming is realized. And when the data agent module carries out roaming operation, the interface for transmitting data by the agent is directly changed by modifying the strategy routing table and the ARP table, a two-layer routing broadcast message does not need to be sent, the efficiency is higher, and real seamless roaming can be realized. The policy routing table is a flexible and customizable routing table stored in the operating system. Changing the proxy forwarding interface means changing the rf module that needs proxy forwarding data, that is, if the data is forwarded through the rf module 1 originally, the data is forwarded through the rf module 2 instead.
Furthermore, the system also comprises an equipment wired interface, the data proxy forwarding module establishes a relay among the radio frequency module, the equipment wired interface and the AP, data packets among all the APs and the STAs are forwarded through the data proxy forwarding module, and the data proxy forwarding module also proxies and forwards the ARP, the DHCP packet and other broadcast packets. The relay is a software relay, that is, the function of the relay is realized by software. The device wired interface is a wired interface of the STA. The wired interface is responsible for accessing wired users. The STA itself does not use data, and the STA is a bridge for data transmission between the wired user and the AP. The proxy forwarding module of the STA is used for forwarding data of all wired interfaces to the AP through the designated radio frequency module, and meanwhile, data sent by the AP is received and forwarded to all wired interfaces through the radio frequency module.
Further, the plurality of radio frequency modules are 2.4G or 5G or a combination of 2.4G and 5G; when the plurality of radio frequency modules are a combination of 2.4G and 5G, the AP end also supports 2.4G and 5G; the plurality of radio frequency modules are all independently provided with SSID, encryption mode and encryption password. The plurality of radio frequency modules are respectively provided with the SSID, the encryption mode and the encryption password, which means that the AP end can be configured with different SSIDs, encryption modes and encryption passwords, thereby providing configuration flexibility, and users can realize the limitation of the number of the AP access clients and the roaming domain through different settings.
Further, the plurality of radio frequency modules include n radio frequency modules from the radio frequency module 1 to the radio frequency module n, and the radio frequency modules from the radio frequency module 1 to the radio frequency module n are respectively associated with n APs, such as the APs 1 to the APn; the device list of the data proxy forwarding module only has one radio frequency module, when the roaming control module finds that the radio frequency module meeting the roaming condition exists in the rest n-1 backup modules, the roaming control module sends a message to inform the data proxy forwarding module, after receiving the message, the data proxy module replaces the original radio frequency module in the device list with the radio frequency module meeting the roaming condition, and the original radio frequency module is deleted from the device list of the data proxy module to finish roaming.
Further, the radio frequency modules in the data agent module device list are primary modules, the remaining n-1 radio frequency modules not in the data agent module device list are backup modules, the roaming control module continuously and circularly checks the connection states and signal strengths of all the radio frequency modules, compares the signal strengths of the current primary module and the other n-1 backup modules, if the signal strength of the backup module is greater than that of the primary module, calculates the minimum signal strength difference according to the signal strength of the primary module, and when the signal strengths satisfy the roaming formula for a plurality of times: the signal strength of the backup module is greater than that of the primary module — the signal strength of the primary module is equal to the minimum signal strength difference, that is, roaming starts.
Further, when the roaming formula is satisfied three times in succession, the roaming control module sends a roaming message to the data proxy forwarding module, that is, the roaming is started. The equation is satisfied three times in succession to ensure that the backup module signal is stable enough to re-roam, preventing unwanted roaming caused by occasional fading or boosting of the signal.
Further, the minimum signal strength difference is obtained through dynamic calculation, and the minimum signal strength difference is related to the signal strength of the main module. The smaller the master module signal strength, the smaller the minimum signal strength difference.
Further, the minimum signal strength difference is calculated according to the three conditions of the current main module signal strength, the base number and the increment: when the signal intensity of the current main module is less than-85, the minimum signal intensity difference value is the base number; when the signal strength of the current main module is greater than or equal to-85 and less than-80, the minimum signal strength difference is radix + increment; when the current main module signal strength is greater than or equal to-80 and less than-75, the minimum signal strength difference is base + (increment 2); when the front main module signal strength is greater than or equal to-75 and less than-70, the minimum signal strength difference is base + (increment 3); when the signal strength of the front main module is larger than or equal to-70, the minimum signal strength difference value is base + (increment is 4); the base number and the increment are set autonomously according to requirements. This arrangement means that roaming is more likely to occur when the signal strength of the master module is smaller, and vice versa, which prevents frequent roaming when the signal strength of the master module is sufficiently large.
Further, the roaming control module also includes a 5G priority rule when calculating the minimum signal strength difference, where the 5G priority rule is: when the main module is 2.4G and the backup module is 5G, the minimum signal intensity difference value is reduced; when the number of the backup modules is 2.4G, the number of the main modules is 5G, and the minimum signal strength difference value is increased. Preferably, when the main module is 2.4G, the backup module is 5G, and the minimum signal intensity difference is halved; when the number of backup modules is 2.4G and the number of main modules is 5G, the minimum signal strength difference is increased by 1.5 times. And the 5G priority principle adjusts the multiple of the minimum signal intensity difference value to be autonomously set according to the requirement. Because the connection rate and throughput of 5G is much greater than 2.4G, the roaming algorithm may tilt towards 5G roaming. If the primary module is 2.4G and the backup module is 5G, the minimum signal strength difference will be smaller, which makes roaming from 2.4G to 5G easier.
Further, when the roaming control module monitors that the signal intensity of the backup module in the n-1 backup modules is smaller than the roaming threshold, the roaming control module controls the backup module with the signal intensity smaller than the roaming threshold to perform scanning operation, and when the backup module with the signal intensity smaller than the roaming threshold scans, the AP backup module with better signal quality is found to automatically disconnect the association with the original AP, and apply for authentication and association with a new AP. The roaming threshold is set by the user according to the actual environment and the actual requirement. Because the backup module is not in the device list of the data proxy forwarding module, the normal data communication between the main module and the AP is not affected by the actions of scanning, disassociating and reassociation performed by the backup module.
The invention provides a method for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized by comprising the following steps:
step 1, distinguishing radio frequency modules, namely, taking one radio frequency module as a main module, setting a plurality of radio frequency modules as backup modules, transmitting data between the main module and APs, and correspondingly associating a plurality of APs with the plurality of backup modules;
step 2, judging once, reading and judging the signal intensity of the main module and the plurality of backup modules, and entering step 3 if the backup modules meet the conditions;
step 3, judging for the second time, judging whether the backup module meeting the first judging condition meets the roaming formula for a plurality of times, and entering step 4 if the backup module meets the roaming formula; it is preferable to determine whether the roaming formula is satisfied three times.
And 4, switching the main module, and replacing the backup module meeting the secondary judgment with a new main module.
Further, in step 1, the primary module and the plurality of backup modules are all 2.4G or 5G or a combination of 2.4G and 5G; when the main module and the plurality of backup modules are all the combination of 2.4G and 5G, the AP end also supports 2.4G and 5G; the main module and the plurality of backup modules are respectively provided with an SSID, an encryption mode and an encryption password.
Further, when the first judgment in step 2 fails and the second judgment in step 3 fails, the step 5 is executed, where the step 5 is:
step 5, judging for three times to judge whether the signal intensity of the plurality of backup modules is smaller than a roaming threshold value; the backup module which is judged to be the AP carries out scanning operation, and the corresponding backup module automatically disconnects the association with the original AP after finding the AP with better signal quality during scanning, and applies for authentication and association of a new AP; if the determination is no, the process proceeds to step 2 again. The roaming threshold is set by the user according to the actual environment.
Further, after step 4 is completed, the process proceeds to step 5.
Further, the conditions required to be satisfied by the first judgment are as follows: judging whether the signal intensity of the backup module is greater than that of the main module; the roaming formula required to be satisfied by the secondary judgment is as follows: judging whether the signal intensity of the main module subtracted from the signal intensity of the backup module for a plurality of times is larger than or equal to the minimum signal intensity difference value or not; the minimum signal strength difference is a value set according to the signal strength of the main module and the 5G priority principle. The minimum signal strength difference is obtained through dynamic calculation, and the minimum signal strength difference is related to the signal strength of the main module. The smaller the master module signal strength, the smaller the minimum signal strength difference. If the minimum signal strength difference is calculated according to the three conditions of the current main module signal strength, the base number and the increment: when the signal intensity of the current main module is less than-85, the minimum signal intensity difference value is the base number; when the signal strength of the current main module is greater than or equal to-85 and less than-80, the minimum signal strength difference is radix + increment; when the current main module signal strength is greater than or equal to-80 and less than-75, the minimum signal strength difference is base + (increment 2); when the front main module signal strength is greater than or equal to-75 and less than-70, the minimum signal strength difference is base + (increment 3); when the signal strength of the front main module is larger than or equal to-70, the minimum signal strength difference value is base + (increment is 4); the base number and the increment are set autonomously according to requirements. The 5G priority principle is as follows: when the main module is 2.4G and the backup module is 5G, the minimum signal intensity difference value is reduced; when the number of the backup modules is 2.4G, the number of the main modules is 5G, and the minimum signal strength difference value is increased. Preferably, when the main module is 2.4G, the backup module is 5G, and the minimum signal intensity difference is halved; when the number of backup modules is 2.4G and the number of main modules is 5G, the minimum signal strength difference is increased by 1.5 times. And the 5G priority principle adjusts the multiple of the minimum signal intensity difference value to be autonomously set according to the requirement.
Furthermore, in step 4, the interface for forwarding data by the proxy is directly changed by modifying the policy routing table and the ARP table.
Compared with the prior art, the invention has the beneficial effects that the data connection is not required to be disconnected and reestablished in the roaming process and the ARP learning is not required to be carried out again due to the arrangement of the modules. And when the data agent module carries out roaming operation, the interface for transmitting data by the agent is directly changed by modifying the strategy routing table and the ARP table, a two-layer routing broadcast message does not need to be sent, the efficiency is higher, and real seamless roaming can be realized.
Drawings
Fig. 1 is a schematic diagram of dual radio frequency module roaming of AN inventive system for implementing W L AN seamless roaming based on multiple radio frequencies.
Fig. 2 is a control flow diagram of a roaming control module of the system for implementing seamless roaming of W L AN based on multiple radio frequencies.
Fig. 3 is a flow chart of AN inventive method for implementing seamless roaming of W L AN based on multiple radio frequencies.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 invention and are not intended to limit the invention.
In order to achieve the above object, the technical solution of the present invention is as follows.
The invention provides a system for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized in that the system comprises a data proxy forwarding module, a roaming control module, a plurality of radio frequency modules on STA and more than one AP;
a plurality of radio frequency modules: one radio frequency module is responsible for data transmission with the AP, and the other radio frequency modules are responsible for scanning and associating the AP with better signal quality;
the data proxy forwarding module: the STA is responsible for data communication between the STA and the AP;
a roaming control module: and the data proxy forwarding module is used for selecting the radio frequency module meeting the conditions and realizing data communication with the corresponding AP.
The data agent module changes the interface of agent forwarding data directly by modifying the strategy routing table and the ARP table.
Furthermore, the system also comprises an equipment wired interface, the data proxy forwarding module establishes a relay among the radio frequency module, the equipment wired interface and the AP, data packets among all the APs and the STAs are forwarded through the data proxy forwarding module, and the data proxy forwarding module also proxies and forwards the ARP, the DHCP packet and other broadcast packets.
Further, the plurality of radio frequency modules are 2.4G or 5G or a combination of 2.4G and 5G; when the plurality of radio frequency modules are a combination of 2.4G and 5G, the AP end also supports 2.4G and 5G; the plurality of radio frequency modules are all independently provided with SSID, encryption mode and encryption password.
Further, the plurality of radio frequency modules include n radio frequency modules from the radio frequency module 1 to the radio frequency module n, and the radio frequency modules from the radio frequency module 1 to the radio frequency module n are respectively associated with n APs, such as the APs 1 to the APn; the device list of the data proxy forwarding module only has one radio frequency module, when the roaming control module finds that the radio frequency module meeting the roaming condition exists in the rest n-1 backup modules, the roaming control module sends a message to inform the data proxy forwarding module, after receiving the message, the data proxy module replaces the original radio frequency module in the device list with the radio frequency module meeting the roaming condition, and the original radio frequency module is deleted from the device list of the data proxy module to finish roaming.
Further, the radio frequency modules in the data agent module device list are primary modules, the remaining n-1 radio frequency modules not in the data agent module device list are backup modules, the roaming control module continuously and circularly checks the connection states and signal strengths of all the radio frequency modules, compares the signal strengths of the current primary module and the other n-1 backup modules, if the signal strength of the backup module is greater than that of the primary module, calculates the minimum signal strength difference according to the signal strength of the primary module, and when the signal strengths satisfy the roaming formula for a plurality of times: the signal strength of the backup module is greater than that of the primary module — the signal strength of the primary module is equal to the minimum signal strength difference, that is, roaming starts.
Further, when the roaming formula is satisfied three times in succession, the roaming control module sends a roaming message to the data proxy forwarding module, that is, the roaming is started.
Further, the minimum signal strength difference is obtained through dynamic calculation, and the minimum signal strength difference is related to the signal strength of the main module. The smaller the master module signal strength, the smaller the minimum signal strength difference.
Further, the minimum signal strength difference is calculated according to the three conditions of the current main module signal strength, the base number and the increment: when the signal intensity of the current main module is less than-85, the minimum signal intensity difference value is the base number; when the signal strength of the current main module is greater than or equal to-85 and less than-80, the minimum signal strength difference is radix + increment; when the current main module signal strength is greater than or equal to-80 and less than-75, the minimum signal strength difference is base + (increment 2); when the front main module signal strength is greater than or equal to-75 and less than-70, the minimum signal strength difference is base + (increment 3); when the signal strength of the front main module is larger than or equal to-70, the minimum signal strength difference value is base + (increment is 4); the base number and the increment are set autonomously according to requirements.
Further, the roaming control module also includes a 5G priority rule when calculating the minimum signal strength difference, where the 5G priority rule is: when the main module is 2.4G and the backup module is 5G, the minimum signal intensity difference value is reduced; when the number of the backup modules is 2.4G, the number of the main modules is 5G, and the minimum signal strength difference value is increased. Preferably, when the main module is 2.4G, the backup module is 5G, and the minimum signal intensity difference is halved; when the number of backup modules is 2.4G and the number of main modules is 5G, the minimum signal strength difference is increased by 1.5 times. And the 5G priority principle adjusts the multiple of the minimum signal intensity difference value to be autonomously set according to the requirement.
Further, when the roaming control module monitors that the signal intensity of the backup module in the n-1 backup modules is smaller than the roaming threshold, the roaming control module controls the backup module with the signal intensity smaller than the roaming threshold to perform scanning operation, and when the backup module with the signal intensity smaller than the roaming threshold scans, the AP backup module with better signal quality is found to automatically disconnect the association with the original AP, and apply for authentication and association with a new AP. The roaming threshold is set by the user according to the actual environment.
The invention provides a method for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized by comprising the following steps:
step 1, distinguishing radio frequency modules, namely, taking one radio frequency module as a main module, setting a plurality of radio frequency modules as backup modules, transmitting data between the main module and APs, and correspondingly associating a plurality of APs with the plurality of backup modules;
step 2, judging once, reading and judging the signal intensity of the main module and the plurality of backup modules, and entering step 3 if the backup modules meet the conditions;
step 3, judging for the second time, judging whether the backup module meeting the first judging condition meets the roaming formula for a plurality of times, and entering step 4 if the backup module meets the roaming formula; it is preferable to determine whether the roaming formula is satisfied three times.
And 4, switching the main module, and replacing the backup module meeting the secondary judgment with a new main module.
Further, in step 1, the primary module and the plurality of backup modules are all 2.4G or 5G or a combination of 2.4G and 5G; when the main module and the plurality of backup modules are all the combination of 2.4G and 5G, the AP end also supports 2.4G and 5G; the main module and the plurality of backup modules are respectively provided with an SSID, an encryption mode and an encryption password.
Further, when the first judgment in step 2 fails and the second judgment in step 3 fails, the step 5 is executed, where the step 5 is:
step 5, judging for three times to judge whether the signal intensity of the plurality of backup modules is smaller than a roaming threshold value; the backup module which is judged to be the AP carries out scanning operation, and the corresponding backup module automatically disconnects the association with the original AP after finding the AP with better signal quality during scanning, and applies for authentication and association of a new AP; if the determination is no, the process proceeds to step 2 again. The roaming threshold is set by the user according to the actual environment.
Further, after step 4 is completed, the process proceeds to step 5.
Further, the conditions required to be satisfied by the first judgment are as follows: judging whether the signal intensity of the backup module is greater than that of the main module; the roaming formula required to be satisfied by the secondary judgment is as follows: judging whether the signal intensity of the main module subtracted from the signal intensity of the backup module for a plurality of times is larger than or equal to the minimum signal intensity difference value or not; the minimum signal strength difference is a value set according to the signal strength of the main module and the 5G priority principle. The minimum signal strength difference is obtained through dynamic calculation, and the minimum signal strength difference is related to the signal strength of the main module. The smaller the master module signal strength, the smaller the minimum signal strength difference. If the minimum signal strength difference is calculated according to the three conditions of the current main module signal strength, the base number and the increment: when the signal intensity of the current main module is less than-85, the minimum signal intensity difference value is the base number; when the signal strength of the current main module is greater than or equal to-85 and less than-80, the minimum signal strength difference is radix + increment; when the current main module signal strength is greater than or equal to-80 and less than-75, the minimum signal strength difference is base + (increment 2); when the front main module signal strength is greater than or equal to-75 and less than-70, the minimum signal strength difference is base + (increment 3); when the signal strength of the front main module is larger than or equal to-70, the minimum signal strength difference value is base + (increment is 4); the base number and the increment are set autonomously according to requirements. The 5G priority principle is as follows: when the main module is 2.4G and the backup module is 5G, the minimum signal intensity difference value is reduced; when the number of the backup modules is 2.4G, the number of the main modules is 5G, and the minimum signal strength difference value is increased. Preferably, when the main module is 2.4G, the backup module is 5G, and the minimum signal intensity difference is halved; when the number of backup modules is 2.4G and the number of main modules is 5G, the minimum signal strength difference is increased by 1.5 times. And the 5G priority principle adjusts the multiple of the minimum signal intensity difference value to be autonomously set according to the requirement.
Furthermore, in step 4, the interface for forwarding data by the proxy is directly changed by modifying the policy routing table and the ARP table.
Compared with the prior art, the invention has the beneficial effects that the data connection is not required to be disconnected and reestablished in the roaming process and the ARP learning is not required to be carried out again due to the arrangement of the modules. And when the data agent module carries out roaming operation, the interface for transmitting data by the agent is directly changed by modifying the strategy routing table and the ARP table, a two-layer routing broadcast message does not need to be sent, the efficiency is higher, and real seamless roaming can be realized.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The invention provides a system for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized in that the system comprises a data proxy forwarding module, a roaming control module, a plurality of radio frequency modules on STA and more than one AP;
a plurality of radio frequency modules: one radio frequency module is responsible for data transmission with the AP, and the other radio frequency modules are responsible for scanning and associating the AP;
the data proxy forwarding module: the STA is responsible for data communication between the STA and the AP;
a roaming control module: the data proxy forwarding module is used for selecting the radio frequency module meeting the conditions and realizing data communication with the corresponding AP;
the data agent module changes the interface of agent forwarding data directly by modifying the strategy routing table and the ARP table.
2. The system of claim 1, further comprising a device wired interface, wherein the data proxy forwarding module establishes a relay among the radio frequency module, the device wired interface, and the AP, all data packets between the AP and the STA are forwarded through the data proxy forwarding module, and the data proxy forwarding module further proxies the broadcast packet, wherein the plurality of radio frequency modules are 2.4G or 5G or a combination of 2.4G and 5G, when the plurality of radio frequency modules are a combination of 2.4G and 5G, the AP also supports 2.4G and 5G, and the plurality of radio frequency modules are individually configured with SSID, encryption scheme, and encryption password.
3. The system according to claim 1, wherein the plurality of RF modules include n RF modules from 1 to n, the RF modules from 1 to n are respectively associated with APs 1 to APn, only one RF module exists in the device list of the data agent forwarding module, the roaming control module sends a message to notify the data agent forwarding module when finding that there is AN RF module satisfying the roaming condition in the remaining n-1 backup modules, the data agent module replaces the original RF module in the device list with the RF module satisfying the roaming condition after receiving the message, and the original RF module is deleted from the device list of the data agent module to complete the roaming.
4. The system according to claim 3, wherein the radio frequency modules in the data agent module device list are primary modules, the remaining n-1 radio frequency modules not in the data agent module device list are backup modules, the roaming control module continuously and cyclically checks the connection status and signal strength of all the radio frequency modules, compares the signal strength of the primary module with the signal strength of the other n-1 backup modules, calculates a minimum signal strength difference according to the signal strength of the primary module if the signal strength of the backup module is greater than that of the primary module, and when a roaming formula is satisfied for a plurality of times, the signal strength of the backup module having a signal strength greater than that of the primary module — the signal strength of the primary module is equal to the minimum signal strength difference, the roaming starts, the minimum signal strength difference is obtained by dynamic calculation, the minimum signal strength difference is related to the signal strength of the primary module, the minimum signal strength difference is smaller, the roaming control module calculates the minimum signal strength difference, and further includes a 5G-first rule, that is a second rule, when the backup module has a 2.4G, the minimum signal strength difference is greater than that is equal to a second rule, and the backup module has a second minimum signal strength.
5. The system of claim 4, wherein the roaming control module monitors that the backup module with the signal strength less than the roaming threshold exists in the n-1 backup modules, and controls the backup module with the signal strength less than the roaming threshold to perform scanning operation, and when the backup module with the signal strength less than the roaming threshold scans, the AP backup module with better signal quality automatically disconnects from the original AP and applies for authentication and association with a new AP.
6. The invention provides a method for realizing W L AN seamless roaming based on multiple radio frequencies, which is characterized by comprising the following steps:
step 1, distinguishing radio frequency modules, namely, taking one radio frequency module as a main module, setting a plurality of radio frequency modules as backup modules, transmitting data between the main module and APs, and correspondingly associating a plurality of APs with the plurality of backup modules;
step 2, judging once, reading and judging the signal intensity of the main module and the plurality of backup modules, and entering step 3 if the backup modules meet the conditions;
step 3, judging for the second time, judging whether the backup module meeting the first judging condition meets the roaming formula for a plurality of times, and entering step 4 if the backup module meets the roaming formula;
and 4, switching the main module, and replacing the backup module meeting the secondary judgment with a new main module.
7. The method as claimed in claim 6, wherein in step 1, the primary module and the plurality of backup modules are 2.4G or 5G or a combination of 2.4G and 5G, and when the primary module and the plurality of backup modules are a combination of 2.4G and 5G, the AP side also supports 2.4G and 5G, and the primary module and the plurality of backup modules are respectively configured with SSID, encryption scheme and encryption password.
8. The method as claimed in claim 6, wherein the step 5 is performed when the first judgment in step 2 fails and the second judgment in step 3 fails, and the step 5 is performed by:
step 5, judging for three times to judge whether the signal intensity of the plurality of backup modules is smaller than a roaming threshold value; the backup module which is judged to be the AP carries out scanning operation, and the corresponding backup module automatically disconnects the association with the original AP after finding the AP with better signal quality during scanning, and applies for authentication and association of a new AP; if not, re-entering the step 2; the roaming threshold is set by the user according to the actual environment; after step 4, the process proceeds to step 5.
9. The method as claimed in claim 6, wherein the condition required for the first determination is to determine whether the signal strength of the backup module is greater than the signal strength of the primary module, the roaming formula required for the second determination is to determine whether the signal strength of the backup module minus the signal strength of the primary module is greater than or equal to a minimum signal strength difference value, and the minimum signal strength difference value is a value set according to the signal strength of the primary module and a 5G priority rule.
10. The method of claim 6, wherein in step 4, the interface for proxy forwarding data is directly changed by modifying the policy routing table and the ARP table.
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| CN105430699A (en) * | 2015-11-18 | 2016-03-23 | 北京华信联创科技有限公司 | Method, device and system for inter-AP high-speed switching of terminal in WLAN network |
| CN110602704A (en) * | 2019-09-19 | 2019-12-20 | 深圳市瑞科慧联科技有限公司 | Non-sensing roaming system and method |
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