CN111935743A - Wireless roaming optimization method, system, device and storage medium - Google Patents

Wireless roaming optimization method, system, device and storage medium Download PDF

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Publication number
CN111935743A
CN111935743A CN202010805148.8A CN202010805148A CN111935743A CN 111935743 A CN111935743 A CN 111935743A CN 202010805148 A CN202010805148 A CN 202010805148A CN 111935743 A CN111935743 A CN 111935743A
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roaming
wireless
wireless roaming
short
optimization
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CN111935743B (en
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吴海丁
单志胜
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Hangzhou Ezviz Software Co Ltd
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Hangzhou Ezviz Software Co Ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a wireless roaming optimization method, a system, a device and a storage medium, which are applied to a wireless network, wherein the wireless network comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group, and the method is specifically applied to the AC and comprises the following steps: performing the following wireless roaming optimization operations for each AP in the roaming group: acquiring surrounding AP information scanned by the AP; judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP; when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.

Description

Wireless roaming optimization method, system, device and storage medium
Technical Field
The present invention relates to the field of technologies, and in particular, to a method, a system, an apparatus, and a storage medium for optimizing wireless roaming.
Background
802.11r is a wireless roaming protocol intended to reduce the time required for authentication when an STA (wireless client) roams.
The following describes an 802.11 r-based wireless roaming procedure with reference to specific examples.
Assuming that the STA first accesses the AP1 and then moves to the direction of the AP2 to perform a roaming procedure of switching from the AP1 to the AP2, the roaming switching procedure of the STA from the AP1 to the AP2 is as shown in fig. 1, and includes the following steps:
S01-S04: the STA communicates with the AP1 to complete security authentication and association;
S05-S08: the STA and the AP1 complete key negotiation through a four-way handshake, and successfully access the AP 1.
S09-S11: the AP1 sends a node add notification (node add notification) to other APs in the lan, distributing a key (PMK-R1) with other APs (e.g., AP 2).
S12-S15: the STA detects that the signal strength between the STA and the AP1 is weakened to a switching threshold value in the process of moving towards the AP2, communicates with the AP2 to complete security authentication and re-association, and completes key negotiation by using a key distributed by the AP1 in the process, so as to successfully access the AP 2.
S16: the STA disassociates with the AP 1.
It can be seen that when the STA roams from the AP1 to the AP2, only the security authentication and association with the AP2 (and the key negotiation is implemented in the process) are required to successfully access the AP2, and no four-segment handshake needs to be separately performed for key negotiation, so that the access process consumes less time.
However, the above wireless roaming procedure is not suitable for a scenario where the APs are too close, for example, in a small family, a problem may occur that the wireless roaming of the STA cannot be triggered because the APs are close to each other. For example, assuming that the distance between the AP1 and the AP2 is short, when the STA moves from the AP1 to the AP2, the signal strength between the STA and the AP1 is not attenuated enough to reach the handoff threshold, and thus the wireless roaming of the STA cannot be triggered.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, a system, an apparatus and a storage medium for optimizing wireless roaming, which can solve the problem that the wireless roaming of an STA between Access Points (APs) cannot be triggered.
In order to achieve the purpose, the invention provides the following technical scheme:
a wireless roaming optimization method is applied to a wireless network, the wireless network comprises an AC (Access Controller) and an AP (Access Controller) which is hung under the AC and belongs to the same roaming group, the method is specifically applied to the AC, and comprises the following steps:
performing the following wireless roaming optimization operations for each AP in the roaming group:
acquiring surrounding AP information scanned by the AP;
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP;
when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
A wireless roaming optimization system comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group;
the AC configured to perform the following wireless roaming optimization operations for each AP in the roaming group: acquiring surrounding AP information scanned by the AP; judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP; when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by meeting the short-distance wireless roaming condition corresponding to the AP according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the AP of the maximum transmitting power;
each AP in the roaming group is used for scanning the information of surrounding APs and providing the scanned information of the surrounding APs for the AC to acquire; and the maximum transmission power corresponding to the AP which is used for receiving the AC notification and allowed by meeting the short-range wireless roaming condition is used for adjusting the transmission power of the AP to be equal to or less than the maximum transmission power.
A wireless roaming optimization device is applied to a wireless network, the wireless network comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group, and the device is specifically applied to the AC and comprises the following steps: a processor, and a non-transitory computer readable storage medium connected to the processor by a bus;
the non-transitory computer readable storage medium storing one or more computer programs executable by the processor; the processor, when executing the one or more computer programs, implements the steps of:
performing the following wireless roaming optimization operations for each AP in the roaming group:
acquiring surrounding AP information scanned by the AP;
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP;
when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps in the wireless roaming optimization method described above.
According to the above technical solution, in the present invention, the information of the surrounding APs scanned by each AP in the roaming group is obtained, when the AP is judged not to satisfy the short-distance wireless roaming condition according to the signal intensity contained in the information of each surrounding AP scanned by the AP, determining the maximum transmitting power corresponding to the AP and allowed by meeting the short-distance wireless roaming condition according to the signal strength contained in the surrounding AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the AP of the maximum transmission power so that the AP adjusts the transmission power downwards to be equal to or less than the maximum transmission power, thereby reducing the signal strength between the AP and other APs in the roaming group to satisfy the short-range wireless roaming condition, therefore, the problem that the wireless roaming of the STA between the close-range APs cannot be triggered can be solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic diagram of a wireless roaming process based on 802.11r in the prior art;
fig. 2 is a flowchart of a wireless roaming optimization method according to an embodiment of the present invention;
fig. 3 is a flowchart of a wireless roaming optimization method according to a second embodiment of the present invention;
fig. 4 is a flowchart of a wireless roaming optimization method according to a third embodiment of the present invention;
fig. 5 is a flowchart of a wireless roaming optimization method according to a fourth embodiment of the present invention;
fig. 6 is a flowchart of a wireless roaming optimization method according to a fifth embodiment of the present invention;
fig. 7 is a flowchart of a wireless roaming optimization method according to a sixth embodiment of the present invention;
fig. 8 is a flowchart of a wireless roaming optimization method according to a seventh embodiment of the present invention;
fig. 9 is a flowchart of a method for optimizing wireless roaming according to an eighth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a wireless roaming optimization system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a wireless roaming optimization apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiment of the present invention, for a wireless network with a short distance between APs (Access points), such as a wireless network of a small-dwelling house, to solve the problem that the wireless roaming of the STA cannot be triggered due to the short distance between APs in such a wireless network, a corresponding relationship between a signal strength attenuation and a transmission power reduction is obtained through summary of experimental data of an actual scene, and a down-regulation operation is performed on the transmission power of each AP by referring to the corresponding relationship, so that the wireless roaming of the STA between APs in a short distance can be triggered.
The method provided by the invention is specifically explained by combining the specific embodiment as follows:
referring to fig. 2, fig. 2 is a flowchart of a wireless roaming optimization method according to an embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 2, the method specifically includes the following steps:
step 201, performing the following wireless roaming optimization operations from step 202 to step 204 on each AP in the roaming group;
step 202, obtaining the surrounding AP information scanned by the AP;
step 203, judging whether the AP meets the short-range wireless roaming condition according to the signal strength contained in the scanned surrounding AP information by the AP;
step 204, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power.
In the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 204, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
As can be seen from the method shown in fig. 2, in this embodiment, when it is determined that the AP does not satisfy the short-range wireless roaming condition according to the signal strength included in the information of each surrounding AP scanned by each AP in the roaming group, the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition is determined by referring to the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, so as to adjust the transmission power of the AP to be equal to or less than the maximum transmission power, so that the signal strength between the AP and other APs in the roaming group is reduced to be able to satisfy the short-range wireless roaming condition, and therefore, the problem that the wireless roaming of the STA between the short-range APs cannot be triggered can be solved.
Referring to fig. 3, fig. 3 is a flowchart of a wireless roaming optimization method according to a second embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 3, the method specifically includes the following steps:
step 301, when it is determined that the roaming group satisfies the wireless roaming optimization triggering condition, performing the wireless roaming optimization operations from step 302 to step 304 for each AP in the roaming group.
The above step 301 is a detailed refinement of step 201 shown in fig. 2.
In this embodiment of the present invention, when it is determined that the roaming group does not satisfy the wireless roaming optimization triggering condition, the wireless roaming optimization operation is prohibited from being performed on each AP in the roaming group, that is, the wireless roaming optimization operations from step 302 to step 304 are not performed on the AP.
Step 302, obtaining the surrounding AP information scanned by the AP;
step 303, determining whether the AP satisfies a short-range wireless roaming condition according to the signal strength included in the information of each neighboring AP scanned by the AP;
step 304, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power.
In the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 304, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
As can be seen from the method shown in fig. 3, compared with the embodiment shown in fig. 2, in this embodiment, in addition to solving the problem that the wireless roaming of the STA between the close-range APs cannot be triggered, the time for performing the wireless roaming optimization on the APs in the roaming group is controlled by the wireless roaming optimization triggering condition, so that frequent wireless roaming optimization operations on the roaming group can be avoided.
Referring to fig. 4, fig. 4 is a flowchart of a wireless roaming optimization method provided by a third embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 4, the method specifically includes the following steps:
step 4011, receiving a roaming optimization triggering instruction;
in the embodiment of the present invention, a function button may be added to the group configuration of the AC, for example, called "802.11 r optimization", and the user may trigger the roaming optimization triggering instruction by clicking the function button.
Step 4012, judge whether the number of APs in the roaming group is greater than 1, if yes, execute step 4013, otherwise, execute step 4014;
step 4013, determining that the roaming group meets the triggering condition for wireless roaming optimization, and performing the wireless roaming optimization operations from step 402 to step 404 on each AP in the roaming group.
Step 4014, determining that the roaming group does not satisfy the wireless roaming optimization triggering condition, and ending the process.
In this embodiment, when it is determined that the roaming group satisfies the wireless roaming optimization triggering condition, the wireless roaming optimization operation is prohibited from being performed on each AP in the roaming group, that is, the wireless roaming optimization operations from step 402 to step 404 are not performed on the AP.
The above steps 4011 to 4014 are a detailed refinement of step 301 shown in fig. 3.
Step 402, obtaining the surrounding AP information scanned by the AP;
step 403, determining whether the AP satisfies a short-range wireless roaming condition according to the signal strength included in the information of each surrounding AP scanned by the AP;
step 404, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power.
In the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 404, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
As can be seen from the method shown in fig. 4, compared with the embodiment shown in fig. 3, in this embodiment, in addition to solving the problem that the wireless roaming of the STA between the close-range APs cannot be triggered, it is determined that the roaming group satisfies the wireless roaming optimization triggering condition by receiving the roaming optimization triggering instruction and determining whether the number of APs in the roaming group is greater than 1 after receiving the roaming optimization triggering instruction, so as to avoid performing unnecessary wireless roaming optimization operation on the roaming group.
Referring to fig. 5, fig. 5 is a flowchart of a wireless roaming optimization method according to a fourth embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 5, the method specifically includes the following steps:
step 501, selecting an unselected AP from the roaming group every a preset time period, and performing the following wireless roaming optimization operations from step 502 to step 504 on the AP;
in this embodiment, the predetermined time period is a predetermined time value, which can be set empirically, for example, 6 seconds. By selecting one AP in the roaming group at intervals of a preset time period to perform wireless roaming optimization operation, the situation that a plurality of APs scan surrounding APs at the same time can be avoided, and therefore the success rate and the integrity of scanning are effectively increased.
Step 502, obtaining the surrounding AP information scanned by the AP;
step 503, determining whether the AP satisfies the short-range wireless roaming condition according to the signal strength included in the scanned information of each surrounding AP by the AP;
step 504, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power.
In the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 504, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
As can be seen from the method shown in fig. 5, in this embodiment, compared with the embodiment shown in fig. 2, in addition to solving the problem that the wireless roaming of the STA between the close-range APs cannot be triggered, the number of APs simultaneously performing scanning on the surrounding APs is controlled by selecting one unselected AP from the roaming group at intervals of a preset time period to perform wireless roaming optimization, so as to increase the success rate and integrity of the scanning.
Referring to fig. 6, fig. 6 is a flowchart of a wireless roaming optimization method provided by a fifth embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 6, the method specifically includes the following steps:
step 601, setting a configuration suspension flag corresponding to each AP in the roaming group to prohibit the AC from performing configuration operations on the AP except configuration operations in the wireless roaming optimization operation process; and performing the following wireless roaming optimization operations of steps 602 to 604 on the AP;
in this embodiment, since the configuration operation of adjusting the transmission power of the AP may be involved in the process of performing the wireless roaming optimization operation on the AP, if the user also configures the AP in other manners at this time, the two configurations may conflict with each other, and in order to avoid such a conflict problem, the AP does not respond to any other configuration instruction for the AP in the wireless roaming optimization process by setting the suspension configuration flag corresponding to the AP.
Step 602, obtaining the surrounding AP information scanned by the AP;
step 603, judging whether the AP meets the short-distance wireless roaming condition according to the signal intensity contained in the information of each surrounding AP scanned by the AP;
step 604, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power;
in the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 604, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
Step 605, deleting the suspend configuration flag corresponding to the AP, so as to allow the AC to perform configuration operations on the AP except configuration operations in the wireless roaming optimization operation process.
In this embodiment, before performing the wireless roaming optimization operation on each AP in the roaming group, the suspend configuration flag corresponding to the AP is set, so that the AP no longer responds to any configuration instruction for the AP, and after performing the wireless roaming optimization operation on each AP in the roaming group, an operation opposite to the operation needs to be performed, that is, the suspend configuration flag corresponding to the AP is deleted, so that the AP can respond to any other configuration instruction for the AP.
As can be seen from the method shown in fig. 6, compared with the embodiment shown in fig. 2, in this embodiment, in addition to solving the problem that the wireless roaming of the STA between the close-range APs cannot be triggered, the response of the AP to any other configuration instruction for the AP in the process of performing the wireless roaming optimization for the AP is controlled by setting and deleting the configuration suspension flag corresponding to the AP, so as to avoid the occurrence of configuration conflict.
Referring to fig. 7, fig. 7 is a flowchart of a wireless roaming optimization method according to a sixth embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 7, the method specifically includes the following steps:
step 701, performing the following wireless roaming optimization operations from step 7021 to step 704 on each AP in the roaming group:
step 7021, issuing a wireless roaming optimization command to the AP, so that the AP scans surrounding AP information and reports the scanned surrounding AP information;
step 7022, receiving the surrounding AP information reported by the AP.
In this embodiment, a new capwap protocol is added between the AC and the AP, and is used for the AC to issue a wireless roaming optimization instruction to the AP, and the AP to report surrounding AP information to the AC.
The above steps 7021 to 7022 are specific refinements of step 202 shown in fig. 2.
Step 703, determining whether the AP satisfies the short-range wireless roaming condition according to the signal strength included in the scanned information of each surrounding AP by the AP;
step 704, when the AP does not satisfy the short-range wireless roaming condition, determining the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, and notifying the maximum transmission power to the AP, so that the AP down-regulates the transmission power to be equal to or less than the maximum transmission power.
In the embodiment of the present invention, when the AP satisfies the short-range wireless roaming condition, which means that when the STA moves from the AP to another AP in the roaming group, the wireless roaming may be triggered, so that the operations of determining the maximum transmission power allowed by the AP satisfying the short-range wireless roaming condition and corresponding to the AP in step 704, and adjusting the transmission power to be equal to or less than the maximum transmission power are not required.
As can be seen from the method shown in fig. 7, in this embodiment, compared with the embodiment shown in fig. 2, in addition to solving the problem that the wireless roaming of the STA between the short-distance APs cannot be triggered, a new capwap protocol is newly defined, so that the wireless roaming optimized communication between the AC and the AP can be realized, and the control of the AC on the wireless roaming optimization of the AP is ensured.
Referring to fig. 8, fig. 8 is a flowchart of a wireless roaming optimization method according to a seventh embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 8, the method specifically includes the following steps:
step 801, performing the following wireless roaming optimization operations from step 802 to step 804 for each AP in the roaming group:
step 802, obtaining the surrounding AP information scanned by the AP;
step 8031, determining whether the maximum signal strength among the signal strengths included in the surrounding AP information scanned by the AP is greater than a preset roaming handover threshold, if so, executing step 8032, otherwise, executing step 8033;
step 8032, determining that the AP does not satisfy the short-range wireless roaming condition, go to step 804 to execute;
step 8033, determining that the AP meets the short-range wireless roaming condition, and ending the wireless roaming optimization operation on the AP;
in the embodiment of the invention, when the AP meets the short-distance wireless roaming condition, the wireless roaming can be triggered when the STA moves from the AP to other APs in the roaming group, so that the wireless roaming optimization operation of the AP can be directly finished.
The above steps 8031 to 8033 are specific refinements of step 203 shown in fig. 2.
Step 804, determining the maximum transmitting power allowed by the AP meeting the short-range wireless roaming condition according to the signal strength included in each piece of surrounding AP information scanned by the AP and the corresponding relationship between the pre-configured signal strength attenuation and the transmitting power reduction, and notifying the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
As can be seen from the method shown in fig. 8, in this embodiment, compared with the embodiment shown in fig. 2, in addition to solving the problem that the wireless roaming of the STA between the close-range APs cannot be triggered, in the process of performing the wireless roaming optimization operation on the AP, it is determined whether the AP satisfies the close-range wireless roaming condition by using the signal strength in the information of each surrounding AP scanned by the AP, and the wireless roaming optimization process is continued only when the AP does not satisfy the close-range wireless roaming condition, and the wireless roaming optimization process is ended when the AP satisfies the close-range wireless roaming condition, so that the unnecessary wireless roaming optimization operation can be avoided.
Referring to fig. 9, fig. 9 is a flowchart of a wireless roaming optimization method according to an eighth embodiment of the present invention, where the method is applied to a wireless network, where the wireless network includes an AC and an AP that is hung from the AC and belongs to the same roaming group, and the method is specifically applied to the AC, and as shown in fig. 9, the method specifically includes the following steps:
step 901, performing the following wireless roaming optimization operations from step 902 to step 9045 for each AP in the roaming group:
step 902, obtaining the surrounding AP information scanned by the AP;
step 903, judging whether the AP meets the short-distance wireless roaming condition according to the signal intensity contained in the scanned surrounding AP information of the AP;
step 9041, when the AP does not satisfy the short-range wireless roaming condition, executing the following steps 9042 to 9045;
step 9042, calculating a signal strength difference between the maximum signal strength of the signal strengths included in the peripheral AP information scanned by the AP and a preset roaming handover threshold;
in this embodiment, the preset roaming switching threshold may be determined in advance through a test, for example, a mainstream mobile phone supporting 802.11r may be selected to perform a wireless roaming test: configuring two APs (access points), such as APx and APy, in a wireless network and configuring the distance between the two APs, so that a mobile phone cannot roam when moving between the two APs; and then, the mobile phone is accessed to the APx firstly, then slowly moves towards the APy, the transmission power is gradually reduced on the APx through a command, when the mobile phone roams at the critical moment, the APx is scanned for one time by the command to obtain the signal intensity of the APy at the moment, and the signal intensity is used as the roaming threshold value of the mobile phone. And obtaining the roaming threshold value of each mobile phone by the same method, and taking the minimum roaming threshold value as a preset switching threshold value.
9043, determining a transmission power reduction amount corresponding to the signal strength difference value according to a preset corresponding relation between the signal strength attenuation amount and the transmission power reduction amount;
in this embodiment, the corresponding relationship may be determined through testing, for example, letting APx and APy be separated by a suitable distance (which may be slightly closer than that in normal roaming networking, mainly considering a case that two APs of a small-sized home are not separated by a long distance), first obtaining the signal strength of APy by scanning a surrounding AP list once by a command on APx, recording the transmission power value of APx at this time, then gradually reducing the transmission power of APx by a command, scanning a surrounding AP list once on APx every time the transmission power is reduced, and recording the signal strength of APy.
And 9044, calculating a power difference value between the transmission power of the AP and the transmission power reduction amount, and determining the power difference value as the maximum transmission power corresponding to the AP and required to meet the short-range wireless roaming condition.
Step 9045, notifying the maximum transmission power to the AP, so that the AP adjusts the transmission power down to be equal to or less than the maximum transmission power.
The above steps 9041 to 9045 are a specific refinement of step 204 shown in fig. 2.
As can be seen from the method shown in fig. 9, in this embodiment, when it is determined that the AP does not satisfy the short-range wireless roaming condition according to the signal strength included in the information of each surrounding AP scanned by each AP in the roaming group, the maximum transmission power allowed by the AP to satisfy the short-range wireless roaming condition is determined by referring to the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, so as to adjust the transmission power of the AP to be equal to or less than the maximum transmission power, so that the signal strength between the AP and other APs in the roaming group is reduced to be able to satisfy the short-range wireless roaming condition, and therefore, the problem that the wireless roaming of the STA between the short-range APs cannot be triggered can be solved.
The wireless roaming optimization method provided by the embodiment of the present invention is described in detail above, and the embodiment of the present invention also provides a wireless roaming optimization system, which is described in detail below with reference to fig. 10.
Referring to fig. 10, fig. 10 is a schematic diagram of an architecture of a wireless roaming optimization system according to an embodiment of the present invention, and as shown in fig. 10, the system includes an AC and an AP under the AC and belonging to the same roaming group;
the AC configured to perform the following wireless roaming optimization operations for each AP in the roaming group: acquiring surrounding AP information scanned by the AP; judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP; when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by meeting the short-distance wireless roaming condition corresponding to the AP according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the AP of the maximum transmitting power;
each AP in the roaming group is used for scanning the information of surrounding APs and providing the scanned information of the surrounding APs for the AC to acquire; and the maximum transmission power corresponding to the AP which is used for receiving the AC notification and allowed by meeting the short-range wireless roaming condition is used for adjusting the transmission power of the AP to be equal to or less than the maximum transmission power.
In the system shown in figure 10 of the drawings,
the AC performing wireless roaming optimization operations for each AP in the roaming group, including:
when the roaming group is determined to meet the wireless roaming optimization triggering condition, performing wireless roaming optimization operation on each AP in the roaming group;
the AC further to: and when the roaming group is determined not to meet the wireless roaming optimization triggering condition, prohibiting the wireless roaming optimization operation of each AP in the roaming group.
In the system shown in figure 10 of the drawings,
the AC, when determining whether the roaming group satisfies a wireless roaming optimization triggering condition, is configured to:
receiving a roaming optimization triggering instruction;
judging whether the number of the APs in the roaming group is more than 1;
when the number of the APs in the roaming group is larger than 1, determining that the roaming group meets a wireless roaming optimization triggering condition;
and when the number of the APs in the roaming group is not more than 1, determining that the roaming group does not meet the wireless roaming optimization triggering condition.
In the system shown in figure 10 of the drawings,
the AC performing wireless roaming optimization operations for each AP in the roaming group, including:
and selecting one unselected AP from the roaming group at intervals of a preset time period, and executing wireless roaming optimization operation on the AP.
In the system shown in figure 10 of the drawings,
the AC, prior to performing wireless roaming optimization operations for each AP in the roaming group, is further configured to: setting a pause configuration flag corresponding to the AP to prohibit the AC from executing configuration operations except the configuration operation in the wireless roaming optimization operation process on the AP;
the AC, after performing a wireless roaming optimization operation for each AP in the roaming group, is further configured to: and deleting the corresponding suspended configuration mark of the AP so as to allow the AC to perform configuration operations on the AP except the configuration operations in the wireless roaming optimization operation process.
In the system shown in figure 10 of the drawings,
the AC acquiring the surrounding AP information scanned by the AP includes:
issuing a wireless roaming optimization instruction to the AP, and receiving surrounding AP information reported by the AP;
each of the APs scans for surrounding AP information and provides the scanned surrounding AP information to the AC for acquisition, including:
and receiving a wireless roaming optimization instruction issued by the AC, scanning the surrounding AP information and reporting the scanned surrounding AP information to the AC.
In the system shown in figure 10 of the drawings,
the AC determining whether the AP satisfies the short-range wireless roaming condition according to the signal strength included in the information of each surrounding AP scanned by the AP, includes:
and judging whether the maximum signal intensity in the signal intensities contained in the peripheral AP information scanned by the AP is greater than a preset roaming switching threshold value, if so, determining that the AP does not meet the short-distance wireless roaming condition, and otherwise, determining that the AP meets the short-distance wireless roaming condition.
In the system shown in figure 10 of the drawings,
the AC determining, according to the signal strength included in each piece of surrounding AP information scanned by the AP and a correspondence between a pre-configured signal strength attenuation and a transmission power reduction, a maximum transmission power allowed to satisfy a short-range wireless roaming condition corresponding to the AP, includes:
calculating the signal intensity difference value between the maximum signal intensity in the signal intensities contained in the surrounding AP information scanned by the AP and a preset roaming switching threshold value;
determining the transmitting power reduction amount corresponding to the signal strength difference value according to the corresponding relation between the pre-configured signal strength attenuation amount and the transmitting power reduction amount;
and calculating the power difference between the transmitting power of the AP and the transmitting power reduction amount, and determining the power difference as the maximum transmitting power corresponding to the AP and required by meeting the short-distance wireless roaming condition.
An embodiment of the present invention further provides a wireless roaming optimization apparatus, which is described below with reference to fig. 11:
referring to fig. 11, fig. 11 is a schematic structural diagram of a wireless roaming optimization apparatus according to an embodiment of the present invention, where the apparatus is applied to a wireless network, where the wireless network includes an access controller AC and a wireless access point AP that is under the AC and belongs to the same roaming group, and the apparatus is specifically applied to the AC, and includes: a processor 1101, and a non-transitory computer readable storage medium 1102 connected to the processor 1101 through a bus;
the non-transitory computer readable storage medium 1102 storing one or more computer programs executable by the processor 1101; the processor 1101, when executing the one or more computer programs, performs the steps of:
performing the following wireless roaming optimization operations for each AP in the roaming group:
acquiring surrounding AP information scanned by the AP;
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP;
when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the AP of the maximum transmitting power so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
In the device shown in figure 11 of the drawings,
the processor 1101, performing a wireless roaming optimization operation on each AP in the roaming group, including:
when the roaming group is determined to meet the wireless roaming optimization triggering condition, performing wireless roaming optimization operation on each AP in the roaming group;
the processor 1101, further configured to: and when the roaming group is determined not to meet the wireless roaming optimization triggering condition, prohibiting the wireless roaming optimization operation of each AP in the roaming group.
In the device shown in figure 11 of the drawings,
the processor 1101, when determining whether the roaming group satisfies the wireless roaming optimization triggering condition, is configured to:
receiving a roaming optimization triggering instruction;
judging whether the number of the APs in the roaming group is more than 1;
when the number of the APs in the roaming group is larger than 1, determining that the roaming group meets a wireless roaming optimization triggering condition;
and when the number of the APs in the roaming group is not more than 1, determining that the roaming group does not meet the wireless roaming optimization triggering condition.
In the device shown in figure 11 of the drawings,
the processor 1101, performing a wireless roaming optimization operation on each AP in the roaming group, including:
and selecting one unselected AP from the roaming group at intervals of a preset time period, and executing wireless roaming optimization operation on the AP.
In the device shown in figure 11 of the drawings,
the processor 1101, before performing the wireless roaming optimization operation on each AP in the roaming group, further sets a suspension configuration flag corresponding to the AP, so as to prohibit the AC from performing configuration operations on the AP except the configuration operation in the wireless roaming optimization operation process;
the processor 1101 further deletes the suspend configuration flag corresponding to each AP in the roaming group after performing the wireless roaming optimization operation on the AP, so as to allow the AC to perform configuration operations on the AP except the configuration operation during the wireless roaming optimization operation.
In the device shown in figure 11 of the drawings,
the processor 1101, obtaining the surrounding AP information scanned by the AP, includes:
issuing a wireless roaming optimization instruction to the AP so that the AP scans surrounding AP information and reports the scanned surrounding AP information;
and receiving the surrounding AP information reported by the AP.
In the device shown in figure 11 of the drawings,
the processor 1101, which determines whether the AP satisfies the short-range wireless roaming condition according to the signal strength included in the information of each surrounding AP scanned by the AP, includes:
and judging whether the maximum signal intensity in the signal intensities contained in the peripheral AP information scanned by the AP is greater than a preset roaming switching threshold value, if so, determining that the AP does not meet the short-distance wireless roaming condition, and otherwise, determining that the AP meets the short-distance wireless roaming condition.
In the device shown in figure 11 of the drawings,
the processor 1101, which determines the maximum transmission power allowed to satisfy the short-range wireless roaming condition corresponding to the AP according to the signal strength included in each piece of surrounding AP information scanned by the AP and the correspondence between the pre-configured signal strength attenuation and the transmission power reduction, includes:
calculating the signal intensity difference value between the maximum signal intensity in the signal intensities contained in the surrounding AP information scanned by the AP and a preset roaming switching threshold value;
determining the transmitting power reduction amount corresponding to the signal strength difference value according to the corresponding relation between the pre-configured signal strength attenuation amount and the transmitting power reduction amount;
and calculating the power difference between the transmitting power of the AP and the transmitting power reduction amount, and determining the power difference as the maximum transmitting power corresponding to the AP and required by meeting the short-distance wireless roaming condition.
An embodiment of the present invention further provides a non-transitory computer readable storage medium storing instructions, wherein the instructions, when executed by a processor, cause the processor to perform the steps of the wireless roaming optimization method as shown in any one of the flowcharts of fig. 2 to 9.
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 (11)

1. A wireless roaming optimization method is applied to a wireless network, and is characterized in that the wireless network comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group, and the method is specifically applied to the AC and comprises the following steps:
performing the following wireless roaming optimization operations for each AP in the roaming group:
acquiring surrounding AP information scanned by the AP;
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP;
when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
2. The method of claim 1,
performing wireless roaming optimization operations for each AP in the roaming group, including:
when the roaming group is determined to meet the wireless roaming optimization triggering condition, performing wireless roaming optimization operation on each AP in the roaming group;
the method further comprises the following steps: and when the roaming group is determined not to meet the wireless roaming optimization triggering condition, prohibiting the wireless roaming optimization operation of each AP in the roaming group.
3. The method of claim 2,
the method for determining whether the roaming group meets the wireless roaming optimization triggering condition comprises the following steps:
receiving a roaming optimization triggering instruction;
judging whether the number of the APs in the roaming group is more than 1;
when the number of the APs in the roaming group is larger than 1, determining that the roaming group meets a wireless roaming optimization triggering condition;
and when the number of the APs in the roaming group is not more than 1, determining that the roaming group does not meet the wireless roaming optimization triggering condition.
4. The method of claim 1,
performing wireless roaming optimization operations for each AP in the roaming group, including:
and selecting one unselected AP from the roaming group at intervals of a preset time period, and executing wireless roaming optimization operation on the AP.
5. The method of claim 1,
before executing wireless roaming optimization operation on each AP in the roaming group, further setting a configuration suspension mark corresponding to the AP to prohibit the AC from executing configuration operation except configuration operation in the wireless roaming optimization operation process on the AP;
and further deleting the configuration suspension mark corresponding to each AP after executing the wireless roaming optimization operation on each AP in the roaming group so as to allow the AC to execute configuration operation on the AP except the configuration operation in the wireless roaming optimization operation process.
6. The method of claim 1,
acquiring the surrounding AP information scanned by the AP, including:
issuing a wireless roaming optimization instruction to the AP so that the AP scans surrounding AP information and reports the scanned surrounding AP information;
and receiving the surrounding AP information reported by the AP.
7. The method of claim 1,
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal strength contained in the peripheral AP information scanned by the AP, wherein the judging step comprises the following steps:
and judging whether the maximum signal intensity in the signal intensities contained in the peripheral AP information scanned by the AP is greater than a preset roaming switching threshold value, if so, determining that the AP does not meet the short-distance wireless roaming condition, and otherwise, determining that the AP meets the short-distance wireless roaming condition.
8. The method of claim 1,
determining the maximum transmission power allowed by the AP to meet the short-range wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmission power reduction, wherein the maximum transmission power is determined by the AP and comprises the following steps:
calculating the signal intensity difference value between the maximum signal intensity in the signal intensities contained in the surrounding AP information scanned by the AP and a preset roaming switching threshold value;
determining the transmitting power reduction amount corresponding to the signal strength difference value according to the corresponding relation between the pre-configured signal strength attenuation amount and the transmitting power reduction amount;
and calculating the power difference between the transmitting power of the AP and the transmitting power reduction amount, and determining the power difference as the maximum transmitting power corresponding to the AP and required by meeting the short-distance wireless roaming condition.
9. A wireless roaming optimization system is characterized in that the system comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group;
the AC configured to perform the following wireless roaming optimization operations for each AP in the roaming group: acquiring surrounding AP information scanned by the AP; judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP; when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by meeting the short-distance wireless roaming condition corresponding to the AP according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the AP of the maximum transmitting power;
each AP in the roaming group is used for scanning the information of surrounding APs and providing the scanned information of the surrounding APs for the AC to acquire; and the maximum transmission power corresponding to the AP which is used for receiving the AC notification and allowed by meeting the short-range wireless roaming condition is used for adjusting the transmission power of the AP to be equal to or less than the maximum transmission power.
10. A wireless roaming optimization device is applied to a wireless network, and is characterized in that the wireless network comprises an Access Controller (AC) and a wireless Access Point (AP) which is hung under the AC and belongs to the same roaming group, and the device is specifically applied to the AC and comprises the following steps: a processor, and a non-transitory computer readable storage medium connected to the processor by a bus;
the non-transitory computer readable storage medium storing one or more computer programs executable by the processor; the processor, when executing the one or more computer programs, implements the steps of:
performing the following wireless roaming optimization operations for each AP in the roaming group:
acquiring surrounding AP information scanned by the AP;
judging whether the AP meets the short-distance wireless roaming condition or not according to the signal intensity contained in the peripheral AP information scanned by the AP;
when the AP does not meet the short-distance wireless roaming condition, determining the maximum transmitting power allowed by the AP meeting the short-distance wireless roaming condition according to the signal strength contained in the peripheral AP information scanned by the AP and the corresponding relation between the pre-configured signal strength attenuation and the transmitting power reduction, and informing the maximum transmitting power to the AP so as to enable the AP to adjust the transmitting power down to be equal to or less than the maximum transmitting power.
11. A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps in the wireless roaming optimization method of any one of claims 1-8.
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