CN109309937B - Method for switching access point, controller, network equipment and storage medium - Google Patents

Method for switching access point, controller, network equipment and storage medium Download PDF

Info

Publication number
CN109309937B
CN109309937B CN201710617820.9A CN201710617820A CN109309937B CN 109309937 B CN109309937 B CN 109309937B CN 201710617820 A CN201710617820 A CN 201710617820A CN 109309937 B CN109309937 B CN 109309937B
Authority
CN
China
Prior art keywords
terminal
rtt
rtts
reference value
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710617820.9A
Other languages
Chinese (zh)
Other versions
CN109309937A (en
Inventor
王瑞丰
王云贵
孙福清
何志健
潘淳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201710617820.9A priority Critical patent/CN109309937B/en
Priority to PCT/CN2018/096795 priority patent/WO2019020004A1/en
Publication of CN109309937A publication Critical patent/CN109309937A/en
Application granted granted Critical
Publication of CN109309937B publication Critical patent/CN109309937B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

Abstract

A method, controller, network device, and computer-readable storage medium of switching access points, the method comprising: the controller determines an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal; and if the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement instructs the terminal to switch the working channel to the working channel of the next AP. After the embodiment of the invention is adopted, the terminal can switch the access point in time on the basis of improving the accuracy of the RTT reference value.

Description

Method for switching access point, controller, network equipment and storage medium
Technical Field
The present invention relates to the field of communications, and in particular, to a method for switching access points, a controller, a network device, and a computer-readable storage medium.
Background
The coverage radius of a Wireless Local Area Network (WLAN) is usually 20 meters (m) to 30m indoors and about 100m outdoors. If a high gain directional antenna is used, the coverage radius of the WLAN can be increased to over 600 m. WLANs are deployed in highways with WLAN devices that can employ high gain directional antennas.
Referring to fig. 1, fig. 1 is a schematic diagram of a highway WLAN system. Access Points (APs) of a WLAN are placed beside a highway, such as: AP1, AP2, and AP 3. A user uses a terminal, such as a cell phone, in a car. The handset connects to a wayside AP, accesses the internet via the AP and further via a wired network device (e.g., a switch or router).
The terminal moves at high speed with the vehicle in the automobile running at high speed. And the terminal is rapidly switched among the APs. The terminal switching means: when the terminal moves from the coverage area of one AP to the coverage area of another AP, the terminal disconnects from the source AP and connects to the destination AP.
In the process of switching the AP, the real-time distance between the terminal and the AP needs to be determined. The real-time distance is calculated according to the round-trip time (RTT) between the AP and the terminal.
The AP sends a detection message comprising a data null frame to the terminal through the air interface, and records the time length from the sending of the detection message to the receiving of an Acknowledgement (ACK) frame as the round-trip time. The real-time distance between the AP and the terminal may be calculated according to formula (1):
D＝RTT*C/2 (1)
wherein, C is the speed of light, and D is the real-time distance between the AP and the terminal.
The RTT calculated according to the method is larger than the time length from the AP to the terminal of the detection message.
Due to the large error of RTT, the access point cannot be switched in time.
Disclosure of Invention
A method, controller, network device, and computer-readable storage medium for switching access points and a time-switch access point are provided.
In a first aspect, a method for switching an access point is provided, the method including:
the controller determines an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal;
and if the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement instructs the terminal to switch the working channel to the working channel of the next AP.
In the above technical solution, the reference value is determined according to a minimum value of multiple RTTs of the terminal, and the reference value is an RTT measured when a physical distance between the terminal and the AP is the closest, and may represent a processing time of a physical device chip. The difference between the RTT of the terminal at the real-time position and the RTT reference value eliminates the influence of different physical devices on the RTT. And if the switching condition is met, indicating the AP currently connected with the terminal to send a channel switching announcement to the terminal so that the terminal can switch the working channel to the working channel of the next AP in time.
With reference to the first aspect, in a first possible implementation manner, the determining, by the controller, the RTT reference value according to a minimum value of multiple RTTs of the terminal includes:
the controller calculates a plurality of RTT average values according to the plurality of RTTs of the terminal, and determines a minimum value of the plurality of RTT average values as an RTT reference value.
In the above technical solution, the minimum value of the RTT mean value is determined as the RTT reference value, and the purpose of calculating the RTT mean value is to reduce the influence of the abnormal RTT on the determination of the RTT reference value.
With reference to the first aspect, the multiple RTTs of the terminal include multiple RTTs measured by multiple APs and associated with the terminal.
In the technical scheme, the RTTs between the APs and the terminal are more in sampling data, so that the RTT reference value is determined in a larger range, and the accuracy of the RTT reference value is improved.
With reference to the first aspect, when the AP switching success rate is less than the preset switching success rate, the multiple RTTs of the terminal only include multiple RTTs measured by the AP to which the terminal is currently connected and between the AP and the terminal.
In the above technical solution, when the AP switching success rate is less than the preset switching success rate, it indicates that the accuracy of the RTT is poor, and therefore, when the RTT reference value is determined, the RTT obtained before needs to be discarded, so as to improve the accuracy of the RTT reference value.
A second aspect of the application provides a controller comprising means for performing the steps of any of the methods described above.
A third aspect of the application provides a network device, the network device comprising a processor and a port,
the processor is configured to:
determining an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal;
and if the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the port indicates the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement indicates the terminal to switch the working channel to the working channel of the next AP.
With reference to the third aspect, in a first possible implementation manner, the processor is specifically configured to calculate a plurality of RTT mean values according to the plurality of RTTs of the terminal, and determine a minimum value of the plurality of RTT mean values as the reference value.
With reference to the third aspect, in an foregoing possible implementation manner, the multiple RTTs of the terminal include multiple RTTs measured by multiple APs and associated with the terminal.
With reference to the third aspect, in the foregoing possible implementation manner, when the AP switching success rate is less than a preset switching success rate, the multiple RTTs of the terminal only include multiple RTTs measured by an AP to which the terminal is currently connected and between the terminal and the AP.
A fourth aspect of the present application provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the above-described aspects.
A fifth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above-described aspects.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
FIG. 1 is a schematic diagram of a highway WLAN system;
fig. 2 is a flowchart illustrating a method for switching an access point according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a wayside deployment of an AP in an embodiment of the present invention;
fig. 4 is a schematic diagram of signaling interaction for obtaining a terminal RTT reference value in the embodiment of the present invention;
figure 5 is a schematic diagram of RTT;
FIG. 6 is a schematic diagram of a handover based on real-time distance;
fig. 7 is a schematic diagram of signaling interaction for obtaining a terminal RTT reference value in the embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a controller according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a network device in an embodiment of the present invention.
Detailed Description
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for switching an access point according to an embodiment of the present invention. The method may be used in a system comprising an AP and a controller. The method comprises the following steps.
S201, the controller determines an RTT reference value according to the minimum value of a plurality of RTTs of the terminal.
A conventional AP provides an independent Basic Service Set Identifier (BSSID). The terminal associates with the AP, i.e. joins the Basic Service Set (BSS) identified by the BSSID. The conventional handover of the terminal between APs changes the BSS where the terminal is located. Accordingly, the terminal may request a BSS having an associated BSSID different from that of the BSS associated before handover.
The terminal is in a vehicle in a highway scenario. Vehicles on a highway are generally in a high-speed moving state. If the AP with which the terminal is associated is switched in a conventional manner, the terminal may associate with a next AP soon after associating with one AP, thereby frequently switching between APs. In order for the terminal not to perceive the occurrence of a handover, a change of BSSID is to be avoided. In the embodiment of the invention, when the new AP provides service for the terminal, BSSID used when the old AP provides service for the terminal is simulated. This process can be regarded as the BSSID moving following the movement of the terminal. An AP which provides a service to a terminal by simulating a corresponding BSSID will be referred to as an AP connected to the terminal hereinafter.
In the above scheme, multiple APs provide the same BSSID. After association, the terminal joins the BSS identified by the BSSID, rather than associating with a particular AP. Neighboring APs typically use different operating channels. The AP connected to the terminal instructs the terminal to Switch the working Channel to the working Channel of the next AP using a Channel Switch Announcement (CSA), thereby switching the terminal between APs.
And the AP connected with the terminal sends an RTT detection message. The RTT probe packet is, for example, an empty data frame. The receiver address of the RTT detection packet is a Media Access Control (MAC) address of the terminal.
The AP may periodically send RTT probe messages for each terminal connected to the AP. For example, the period for sending RTT probe messages is 200 milliseconds, i.e. 5 RTT probe messages are sent to a single terminal every second. The AP may also send probe messages aperiodically.
The AP sends the RTT to a controller connected to the AP, and the controller may determine the RTT reference value according to a minimum value of the RTTs of the terminal.
Referring to fig. 3, fig. 3 is a schematic roadside deployment diagram of an AP in the embodiment of the present invention. The terminal connected to the AP1 moves from the position a to the position a1, and the terminal connected to the AP1 moves from the position a1 to the position a 2.
During the movement of the terminal connected to the AP1, the RTT gradually decreases from a large value to a minimum value, and then gradually increases from the minimum value. That is, the RTT of the terminal connected to the AP1 at the position a is greater than the RTT of the terminal at the position a1, and the RTT of the terminal at the position a1 is smaller than the RTT of the terminal at the position a 2. When a terminal connected to the AP1 is at a position a1 closest to the AP1, the RTT of the terminal with the AP1 is minimum.
The RTT closest to the RTT minimum value is referred to as an RTT reference value. The RTT reference value is an RTT measured when the physical distance between the terminal and the AP is the closest, and may represent a processing time of the physical device chip. In order to determine the RTT reference value, the controller may select a minimum value among a plurality of RTTs of the terminal, and use the minimum value as the RTT reference value. Thereby ensuring the accuracy of the RTT reference value.
In addition, the controller may further calculate a plurality of RTT mean values according to a plurality of RTTs of the terminal, determine a minimum value among the plurality of RTT mean values, and use the minimum value as the RTT reference value. The purpose of calculating the RTT mean value is to reduce the influence of the abnormal RTT on the determination of the RTT reference value.
The controller may also calculate an average value of RTTs over a specified period from a plurality of RTTs of the terminal. The specified period can be preset according to actual requirements. As an example, if the specified period is 1 hour, the controller may calculate an RTT average value within 1 hour according to a plurality of RTTs of the terminal, and then each hour has a corresponding RTT average value, and select a minimum value among the RTT average values in each hour, and then use the minimum value as the RTT reference value.
Consider that there is a minimum value of RTT for the terminal when connecting to each AP. Theoretically, when the AP models are all the same, the RTT minimum is equal for a terminal when connecting to each AP.
In the practical application process, various factors are considered, such as: weather conditions, speed of movement of the AP, or equipment loss. Even if the AP models are all identical, the RTT minimum may not be equal for one terminal in connection with each AP.
Taking an example of obtaining the RTT reference value of the terminal as an example, refer to fig. 4, which is a schematic diagram of signaling interaction for obtaining the RTT reference value in the embodiment of the present invention.
First, a terminal is connected with an AP, and the AP reports an event to a controller.
Then, the AP sends RTT detection messages to the terminal at regular time, and after obtaining the RTT each time, the AP reports the RTT to the controller.
Finally, the controller selects a minimum value of the RTTs from among the RTTs, and determines the minimum value as an RTT reference value.
The first scheme is as follows:
the controller may determine the RTT reference value according to a minimum value of a plurality of RTTs when the terminal is connected to the plurality of APs.
Specifically, there are multiple RTTs when a terminal connects to one AP. The terminal is connected with the APs in sequence and goes to be connected, so that each AP has a plurality of RTTs, the APs measure a plurality of RTTs between the AP and the terminal, the RTT reference value is determined based on the RTTs, and the accuracy of the RTT reference value can be improved.
Scheme II:
the AP to which the terminal is connected may be of the same or different model. The RTT is different for APs of different models. Then, an RTT reference value corresponding to each AP may be determined for the AP.
The controller may determine the RTT reference value according to a minimum value of RTTs when connecting with each AP. Specifically, when the terminal connects to each AP, there are a plurality of RTTs, and the minimum value among the plurality of RTTs is determined as the RTT reference value. That is, the RTT reference value differs from AP to AP.
For the APs of different models, the RTT reference value corresponding to the AP may be determined, and the pertinence and accuracy of the RTT reference value may be improved.
The third scheme is as follows:
considering the AP switching success rate, when the AP switching success rate is less than the preset switching success rate, it indicates that the RTT accuracy during AP connection may be poor, and therefore when the RTT reference value is determined, the RTT used before connection with the AP needs to be discarded. The multiple RTTs of the terminal only include multiple RTTs measured between the AP to which the terminal is currently connected and the terminal.
For example: the AP1, the AP2, the AP … …, the AP10, the AP11 and the AP12 are sequentially arranged on the roadside of the expressway, the terminal sequentially drives to the AP12 from the AP1, and the terminal is sequentially connected with the AP1, the AP2, the AP … … and the AP 12.
And in the 9 switching processes from the AP1 to the AP10, the success rate of switching the AP is less than the preset success rate of switching. During the connection process of the AP10 switching to the AP11, the controller discards a plurality of RTTs when the AP1 to AP10 connected with the terminal are connected.
The controller may determine the RTT reference value according to a minimum value of a plurality of RTTs when connecting with the AP10, so as to improve accuracy of the RTT reference value.
The three schemes can be selected and used according to actual conditions. That is, a plurality of the above-described three schemes may be simultaneously performed.
S202, if the switching condition based on the difference value of the real-time RTT and the RTT reference value is met, the controller is used for indicating the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement indicates the terminal to switch the working channel to the working channel of the next AP.
Referring to fig. 5, the AP acquires 2 more RTT times (T1+ T2) than the real RTT time. 2(T1+ T2) is called an RTT reference value (RTT BASE value, RTT-BASE). T1 is related to the chip used by AP, and T2 is related to the chip used by the terminal, which is 2 times (T1+ T2) because it is the round trip delay. The RTT-BASE value for a given pair of AP and terminal is fixed.
L＝(RTT-b)*C/2 (2)
Wherein b is the RTT-BASE value of the terminal, and L is the real-time distance between the AP currently connected with the terminal and the terminal.
Consider that the change in real-time distance is related to the true RTT.
Real RTT-b (3)
The real RTT is the actual round trip delay between the AP to which the terminal is currently connected and the terminal.
And the difference between the real RTT and the RTT reference value is the real RTT, the real RTT meets the switching condition, the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement instructs the terminal to switch the working channel to the working channel of the next AP.
The first condition is as follows:
referring to fig. 6, fig. 6 is a schematic diagram of switching based on real-time distance. The terminal approaches the AP1 gradually, and the real-time distance of the terminal can know whether the terminal enters the handover area. The handover area is determined by a preset minimum handover threshold and a preset maximum handover threshold.
In position a, the terminal does not enter the handover area. In position B, the terminal enters the handover area. And the controller judges that the switching condition is met, and the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal.
And (3) calculating to obtain the real-time distance between the currently connected AP and the terminal based on the real RTT and the formula (2). The handover condition is greater than a preset minimum handover threshold.
And the real-time distance between the currently connected AP and the terminal is greater than the preset minimum switching threshold, and the controller instructs the currently connected AP of the terminal to send a channel switching announcement to the terminal.
Case two:
the handover condition is greater than a preset RTT threshold. The handover region in fig. 6 may be determined by a preset minimum RTT threshold and a preset maximum RTT threshold.
And (4) calculating the obtained real RTT according to the formula (3), wherein the real RTT is greater than a preset minimum RTT threshold value, and the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal.
Case three:
the handover condition may also take into account the Received Signal strength indication, i.e. (RSSI), as well as a preset maximum handover threshold and a preset minimum handover threshold.
The real-time distance between the currently connected AP and the terminal can be calculated and obtained based on the real RTT and the formula (2), the real-time distance between the currently connected AP and the terminal is larger than a preset minimum switching threshold value and smaller than a preset maximum switching threshold value, and meanwhile, if the RSSI is smaller than the RSSI threshold value, the controller indicates the currently connected AP of the terminal to send a channel switching announcement to the terminal.
Case four:
the handover condition takes into account the RSSI, as well as a preset maximum RTT threshold and a preset minimum RTT threshold.
And (3) calculating the obtained real RTT according to the formula (3), wherein the real RTT is greater than a preset maximum RTT threshold and smaller than a preset minimum RTT threshold, and simultaneously the RSSI is smaller than the RSSI threshold, and the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal.
That is, based on that the difference between the real-time RTT and the RTT reference value satisfies the handover condition, the controller instructs the AP to which the terminal is currently connected to send a channel handover announcement to the terminal.
In the embodiment of the invention, the controller determines the RTT reference value according to the minimum value of the RTTs of the terminal, so that the error of the RTT reference value can be ensured to be smaller. If the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the controller is used for indicating the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement indicates the terminal to switch the working channel to the working channel of the next AP, so that the terminal is ensured to communicate through the AP.
Referring to fig. 7, fig. 7 is a schematic signaling interaction diagram for acquiring a terminal RTT reference value in the embodiment of the present invention, which specifically includes:
first, the AP1 sends an RTT probe message to the terminal, and the terminal replies an ACK message to the AP 1. The AP1 reports the terminal RTT reference value to the controller. And the controller determines the difference value between the real-time RTT and the RTT reference value according to the reported terminal RTT reference value.
Then, the controller sends a channel switch announcement to the terminal through the AP1 when the switching condition is satisfied. The terminal is switched from the working channel of the AP1 to the working channel of the AP2, and the AP2 sends switching result feedback to the controller.
Finally, the controller records the switching result.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a controller according to an embodiment of the present invention, which specifically includes: a calculation module 801 and a sending module 802. The function of each module is described in detail in the above steps.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a network device in an embodiment of the present invention, including a processor 901 and a port 902, for implementing a method for switching an access point. Optionally, the network device further comprises a memory 903.
The processor 901, the port 902, and the memory 903 are connected to each other, for example, by a bus. Processor 901 may be a Central Processing Unit (CPU). The port 902 may be a wireless port or a wired port. The wireless port may be a cellular mobile network port, a WLAN port, etc. The wired port may be an ethernet port, for example, an optical port or an electrical port.
The memory 903 may be a Read Only Memory (ROM) or a Random Access Memory (RAM), a magnetic memory, or the like, among others.
The processor 901 determines an RTT reference value according to a minimum value of multiple RTTs of the terminal; if the switching condition based on the difference between the real-time RTT and the RTT reference value is satisfied, the port 902 indicates the AP to which the terminal is currently connected to send a channel switching announcement to the terminal, and the channel switching announcement indicates the terminal to switch the working channel to the working channel of the next AP.
Specific processing details of the processor 901 refer to the embodiments corresponding to fig. 2-8.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, twisted pair, optical fiber) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any medium that can be accessed by a computer or a data storage device including one or more integrated servers, data centers, and the like. The media may be magnetic media (e.g., floppy disks, hard disks, magnetic tape), optical media (e.g., compact disks), or semiconductor media (e.g., Solid State Disks (SSDs)), among others.

Claims (13)

1. A method of switching access points, the method comprising:
the controller determines an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal;
and if the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the controller instructs the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement instructs the terminal to switch the working channel to the working channel of the next AP.
2. The method of claim 1, wherein the controller determines the RTT reference value according to a minimum value of RTTs of the terminal, and the method comprises:
the controller calculates a plurality of RTT average values according to the plurality of RTTs of the terminal, and determines the minimum value of the plurality of RTT average values as the RTT reference value.
3. The method according to claim 1 or 2, wherein the plurality of RTTs of the terminal includes a plurality of RTTs measured by a plurality of APs and the terminal.
4. The method of switching access points according to claim 1 or 2,
and when the AP switching success rate is less than the preset switching success rate, the RTTs of the terminal only comprise a plurality of RTTs measured by the AP currently connected with the terminal and between the AP and the terminal.
5. A controller, characterized in that the controller comprises:
the calculation module is used for determining an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal;
and a sending module, configured to instruct an AP to which the terminal is currently connected to send a channel switching announcement to the terminal if a switching condition based on a difference between the real-time RTT and the RTT reference value is satisfied, where the channel switching announcement instructs the terminal to switch a working channel to a working channel of a next AP.
6. The controller according to claim 5, wherein the calculating module is specifically configured to calculate a plurality of RTT averages according to the plurality of RTTs of the terminal, and determine a minimum value of the plurality of RTT averages as the reference value.
7. The controller according to claim 5 or 6, wherein the plurality of RTTs of the terminal comprises a plurality of RTTs measured by a plurality of APs with the terminal.
8. The controller according to claim 5 or 6, wherein when the success rate of switching the AP is less than a preset success rate of switching, the RTTs of the terminal only include RTTs measured by the AP to which the terminal is currently connected and the terminal.
9. A network device, comprising a processor and a port, the processor configured to:
determining an RTT reference value according to the minimum value of a plurality of round trip time RTTs of the terminal;
and if the switching condition based on the difference value between the real-time RTT and the RTT reference value is met, the port indicates the AP currently connected with the terminal to send a channel switching announcement to the terminal, and the channel switching announcement indicates the terminal to switch the working channel to the working channel of the next AP.
10. The network device according to claim 9, wherein the processor is specifically configured to calculate a plurality of RTT averages according to the plurality of RTTs of the terminal, and determine a minimum value of the plurality of RTT averages as the reference value.
11. The network device according to claim 9 or 10, wherein the plurality of RTTs of the terminal includes a plurality of RTTs measured by a plurality of APs and the terminal.
12. The network device according to claim 9 or 10, wherein when the AP handover success rate is less than the preset handover success rate, the RTTs of the terminal only include RTTs measured by the AP to which the terminal is currently connected and the terminal.
13. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-4.
CN201710617820.9A 2017-07-26 2017-07-26 Method for switching access point, controller, network equipment and storage medium Active CN109309937B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201710617820.9A CN109309937B (en) 2017-07-26 2017-07-26 Method for switching access point, controller, network equipment and storage medium
PCT/CN2018/096795 WO2019020004A1 (en) 2017-07-26 2018-07-24 Method for switching access point, controller, network device and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710617820.9A CN109309937B (en) 2017-07-26 2017-07-26 Method for switching access point, controller, network equipment and storage medium

Publications (2)

Publication Number Publication Date
CN109309937A CN109309937A (en) 2019-02-05
CN109309937B true CN109309937B (en) 2020-07-07

Family

ID=65040854

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710617820.9A Active CN109309937B (en) 2017-07-26 2017-07-26 Method for switching access point, controller, network equipment and storage medium

Country Status (2)

Country Link
CN (1) CN109309937B (en)
WO (1) WO2019020004A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021051286A1 (en) * 2019-09-17 2021-03-25 Oppo广东移动通信有限公司 Method for switching network devices, terminal device and network device
CN110868747B (en) * 2019-11-28 2020-09-25 上海商米科技集团股份有限公司 Method for detecting delay and automatically switching multiple network modes
CN113300898A (en) * 2020-04-10 2021-08-24 阿里巴巴集团控股有限公司 Information processing method and system and electronic equipment
CN114258126A (en) * 2020-09-25 2022-03-29 上海华为技术有限公司 Data processing method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102457510A (en) * 2010-11-02 2012-05-16 中兴通讯股份有限公司 Method and system for HAP (Host Access Point) switching
CN104471966A (en) * 2012-07-20 2015-03-25 高通股份有限公司 Relative positioning applications in wireless devices
CN105492922A (en) * 2013-08-30 2016-04-13 高通股份有限公司 Passive positioning utilizing round trip time information

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120057481A1 (en) * 2010-09-07 2012-03-08 Electronics And Telecommunications Research Institute System and method for measuring round trip time based on wireless local area network
CN101977423B (en) * 2010-10-19 2013-01-30 北京航空航天大学 Method for selecting access point by vehicle-mounted WiFi (Wireless Fidelity) equipment
US8761142B2 (en) * 2012-10-19 2014-06-24 Ubiquiti Networks, Inc. Distributed seamless roaming in wireless networks
CN102917424A (en) * 2012-10-25 2013-02-06 陕西科技大学 AP (application process) switching method used in WiFi (wireless fidelity) communication
US20150131460A1 (en) * 2013-11-13 2015-05-14 Qualcomm Incorporated Method and apparatus for using rssi and rtt information for choosing access points to associate with

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102457510A (en) * 2010-11-02 2012-05-16 中兴通讯股份有限公司 Method and system for HAP (Host Access Point) switching
CN104471966A (en) * 2012-07-20 2015-03-25 高通股份有限公司 Relative positioning applications in wireless devices
CN105492922A (en) * 2013-08-30 2016-04-13 高通股份有限公司 Passive positioning utilizing round trip time information

Also Published As

Publication number Publication date
WO2019020004A1 (en) 2019-01-31
CN109309937A (en) 2019-02-05

Similar Documents

Publication Publication Date Title
US9247394B2 (en) Using neighboring access points to provide client device location data
US11368822B2 (en) Changing topology in a wireless network
CN109309937B (en) Method for switching access point, controller, network equipment and storage medium
US9226260B2 (en) Initiator-conditioned fine timing measurement service request
US9107134B1 (en) Edge sector handoff determination
CN109275168B (en) System and method for optimizing switching parameter settings of terminals on public transportation platform
US9072018B2 (en) Wireless channel switching using co-located radios
CN102196556B (en) System and method for determining position and coverage radium of APs (access points) of WIFI (wireless fidelity) network
CN103596228A (en) Wireless channel switching method and device
EP2578013A1 (en) Network-based area positioning for capacity and coverage improvement
WO2022000144A1 (en) Measurement method, base station, multi-mode terminal, communication device and storage medium
US9769853B2 (en) Communication apparatus, communication system, and computer-readable recording medium
US20160109554A1 (en) ADAPTIVE OPTIMIZATION OF TIME OF FLIGHT (ToF) EXCHANGE
JP2020502862A (en) Beam measuring method and device
JP7358710B2 (en) Equipment and user equipment positioning methods
CN103747431A (en) Method and device for realizing rapid roaming based on neighbor detection
US20230328537A1 (en) Radio wave map provision device, and radio wave map acquisition usage device
EP3419325B1 (en) Distance measurement method using wireless fidelity (wi-fi), related device, and system
JP2015041944A (en) Method of measuring signal quality, communication method, controller, communication device, and communication system
WO2018121439A1 (en) Method and apparatus for determining direct path
US20210084563A1 (en) Electronic apparatus, system, and server
CN109104762A (en) A kind of method and apparatus that adjustment wlan network frame sends power
CN111199312B (en) Path planning method, path planning device, storage medium and electronic equipment
WO2022085315A1 (en) Radio map generation device, radio map provision device, radio map acquisition and utilization device, and probe information transmission device
CN115776685A (en) Communication method, device, equipment and storage medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant