CN109889992B - Wireless access point filtering method and system and electronic device - Google Patents
Wireless access point filtering method and system and electronic device Download PDFInfo
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Abstract
A wireless access point filtering method for filtering wireless access points scanned by an electronic device located in a moving vehicle, the method comprising: judging whether the electronic device is positioned in the vehicle; calculating, namely calculating the relative speed of the electronic device and the wireless access point when the electronic device is judged to be positioned in the vehicle; and a screening step, wherein the wireless access points are screened and filtered according to the relative speed. The invention also provides a wireless access point filtering system and an electronic device corresponding to the method.
Description
Technical Field
The present invention relates to a method, a system and an electronic device for filtering Access Points (APs), and more particularly, to a method, a system and an electronic device for filtering APs in a mobile state (e.g., a vehicle in motion).
Background
When a user of a mobile device takes a bus, even if the bus has Access Points (APs), the mobile device may be automatically connected to the APs outside the bus, but in the driving process of the bus, along with the continuous movement of the bus, the distance between the mobile device and the APs is continuously changed, so that the mobile device is continuously disconnected from the APs and is reconnected with new APs, and the wireless connection of the mobile device on the bus is not stable enough and the communication quality is poor.
Disclosure of Invention
In view of the above problems, it is desirable to provide a wireless access point filtering method that can screen out wireless access points that can provide stable wireless connection.
In addition, it is necessary to provide a system and an electronic device corresponding to the above method.
A wireless access point filtering method for filtering wireless access points scanned by an electronic device located in a moving vehicle, the method comprising:
judging whether the electronic device is positioned in the vehicle;
calculating, namely calculating the relative speed of the electronic device and the wireless access point when the electronic device is judged to be positioned in the vehicle; and
and a screening step, wherein the wireless access points are screened and filtered according to the relative speed.
A wireless access point filtering system for filtering wireless access points scanned by an electronic device located within a moving vehicle, the system comprising:
the judging module is used for judging whether the electronic device is positioned in the vehicle or not;
the calculating module is used for calculating the relative speed of the electronic device and the wireless access point when the judging module judges that the electronic device is positioned in the vehicle; and
and the screening module is used for screening and filtering the wireless access points according to the relative speed.
An electronic device comprises a processor and a memory connected with the processor, wherein the memory is used for storing the wireless access point filtering system, and the processor is used for executing the wireless access point filtering system.
The wireless access point filtering system and the wireless access point filtering method can screen out the wireless access points which can provide stable wireless connection, so that the electronic device can still obtain stable wireless connection even in a mobile state.
Drawings
FIG. 1 is a functional block diagram of an electronic device according to a preferred embodiment of the invention.
Fig. 2 is a functional block diagram of a wireless access point filtering system according to a preferred embodiment of the present invention.
Fig. 3A-3B are flow charts of methods for filtering aps according to preferred embodiments of the present invention.
Fig. 4A-4B are schematic diagrams illustrating a moving direction of a wireless access point and an electronic device according to a preferred embodiment of the invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "electrically connected" to another element, it can be connected by contact, e.g., by wires, or by contactless connection, e.g., by contactless coupling.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 and 2, an operating environment and functional block diagram of a wireless access point filtering system 10 according to a preferred embodiment of the invention is shown. The wireless access point filtering system 10 is installed and operated in the electronic device 1. The electronic device 1 may be a mobile phone, a PDA (personal digital assistant), a handheld game machine, a digital camera, a handheld computer, or other devices that need to be connected to a wireless access point. The wireless access point filtering system 10 can filter the wireless access points scanned by the electronic device 1 when the electronic device 1 is in a moving state (for example, in a vehicle such as a running car or a running ship), so as to screen out the wireless access points that can provide a stable wireless connection to the electronic device 1, for example, the wireless access points provided by the vehicle itself. In the preferred embodiment, the wireless ap filtering system 10 can filter out wireless aps with zero or low relative velocity to the electronic device 1.
The electronic device 1 further includes a speed measuring module 11, a distance sensing module 13, a receiving module 15, a display 17, a memory 18 and a processor 19.
The speed measuring module 11 is used for measuring the moving speed of the electronic device 1. For example, the speed measuring module 11 can determine the position of the electronic device 1 by using the existing satellite positioning system, and calculate the moving speed of the electronic device 1 by using the variation of the position with time. The satellite positioning system may be the russian global navigation satellite system (GLONASS), the united states Global Positioning System (GPS), the european union galileo positioning system, or the chinese beidou satellite positioning system. When the electronic device 1 is located in a running vehicle, the moving speed is the running speed of the vehicle.
The distance sensing module 13 is used for measuring the distance between the electronic device 1 and the surrounding objects. In the preferred embodiment, the distance sensing module 13 can be a microwave sensor, and the object can be an inner wall, a ceiling wall, etc. of a vehicle when the electronic device 1 is located in the vehicle. The distance measured by the distance sensing module 13 is used to determine whether the electronic device 1 is located in a driving vehicle according to the moving speed of the electronic device 1 measured by the speed measuring module 11.
The receiving module 15 is configured to receive information periodically broadcast by a wireless access point, for example, the information may be a wireless signal such as a signal frame (beacon frame), and obtain a signal frequency Fap of the information and a signal frequency Fsta of the electronic device 1 actually receiving the information. Specifically, the receiving module 15 can obtain current channel information (current channel information) of the wireless access point and the signal frequency Fsta of the electronic device 1 actually receiving the information according to the information received from the wireless access point, and then query the signal frequency Fap of the wireless access point sending the information corresponding to the current channel number included in the current channel information. The signal frequency Fap of the wireless access point sending the information and the signal frequency Fsta of the electronic device 1 actually receiving the information are used by the wireless access filtering system 10 to calculate the relative speed between the wireless access point and the electronic device 1.
The display 17 is used to display the list of wireless access points screened by the wireless access filtering system 10 for selection by the user.
The memory 18 may be built in the electronic device 1, or may be a separate external memory Card, such as an SM Card (Smart Media Card), an SD Card (Secure Digital Card), or the like. The memory 18 is used for storing various data and program codes, such as the wireless access filtering system 10 described above. The processor 19 is configured to execute an operating system and various applications in the electronic device 1, such as the wireless access filtering system 10.
The wireless access filtering system 10 includes a setting module 101, an obtaining module 102, a determining module 103, a monitoring module 104, a calculating module 105, a screening module 106, and a recording module 107.
The setting module 101 is configured to set an initial value of a state parameter P of the electronic device 1, where the state parameter P represents whether the electronic device 1 is located in a vehicle. In the preferred embodiment, the initial value of the state parameter P is set to false, indicating that the electronic device 1 is located outside the vehicle. In addition, when the state parameter P is true, it indicates that the electronic device 1 is located in a vehicle.
The obtaining module 102 is configured to obtain the moving speed of the electronic device 1 and the distance of an object farthest from the electronic device 1 through the speed measuring module 11 and the distance sensing module 13, where the object may be an inner wall or a top wall of a vehicle.
The determining module 103 is configured to determine whether the electronic device 1 is located in the transportation vehicle, specifically, the determining module 103 determines whether the moving speed is greater than a first predetermined speed (e.g., 20km/h) and the distance is less than a predetermined distance (e.g., 1m), if the moving speed is greater than the first predetermined speed and the distance is less than the predetermined distance, then determines that the electronic device 1 is located in the transportation vehicle, if the moving speed is less than the first predetermined speed or the distance is greater than the predetermined distance, the determining module 103 further determines whether the moving speed is less than a second predetermined speed (e.g., 2km/h) and the distance is greater than the predetermined distance (e.g., 1m), if the moving speed is less than the second predetermined speed and the distance is greater than the predetermined distance, then determines that the electronic device 1 is located outside the transportation vehicle, and if the moving speed is greater than a second preset speed or the distance is less than the preset distance, judging whether the electronic device 1 is positioned in the vehicle again.
The monitoring module 104 is configured to monitor the information periodically broadcast by the wireless access point through the receiving module 15, and obtain the signal frequency Fap of the information sent by the wireless access point and the signal frequency Fsta of the information actually received by the electronic device 1 according to the information.
The calculating module 105 is configured to calculate a relative speed between the electronic device 1 and the wireless access point according to the signal frequency Fap of the information sent by the wireless access point and the signal frequency Fsta of the information actually received by the electronic device 1. In the preferred embodiment, the calculation module 105 calculates the Doppler Effect (Doppler Effect) according to the formula: (Fsta-Fap)/Fap ═ Vsta × cos θ/c, where Fap represents the signal frequency of the wireless access point sending the information, Fsta represents the signal frequency of the electronic device 1 actually receiving the information, and θ represents the angle between the traveling direction of the electromagnetic wave of the wireless access point sending the information and the moving direction of the electronic device 1 (e.g., the angle between the traveling direction of the electromagnetic wave of the wireless access point sending the information and the moving direction of the electronic device 1)As shown in fig. 4A, where AP represents a wireless access point and STA represents the electronic device 1), in the preferred embodiment, the included angle θ is defined as zero, i.e. assuming that the electromagnetic wave traveling direction of the information is the same as the moving direction of the electronic device 1 (as shown in fig. 4B), c is the speed of light, which is equal to 2.99792458 × 108m/s, Vsta represents the relative velocity.
The screening module 106 is configured to screen and filter the wireless access points according to the relative speed. Specifically, the screening module 106 determines whether the relative speed is equal to zero, if the relative speed is equal to zero, the recording module 107 determines whether the wireless access point has not waited, if the wireless access point has not waited, the monitoring module 104 monitors the information periodically broadcast by the wireless access point after waiting for a preset time (e.g., 1s), and the calculating module 105 calculates the relative speed between the wireless access point and the electronic device 1, if the relative speed is still zero and has waited, it indicates that the wireless access point is stationary with respect to the electronic device 1, and can provide stable wireless connection, and then accepts the wireless access point.
If the relative speed is not equal to zero, the screening module 106 further determines whether the relative speed is less than a predetermined relative speed (e.g., 2km/h), and if the relative speed is less than the predetermined relative speed, it indicates that the wireless access point can provide a relatively stable wireless connection, and the screening module 106 accepts the wireless access point. The screening module 106 may provide a list of wireless access points accepted by the screening module 106 via the display 17, and a user may select a wireless access point that provides a more stable wireless connection based on the list. If the relative speed is greater than or equal to the predetermined relative speed, which indicates that the wireless access point cannot provide a relatively stable wireless connection, the filtering module 106 filters the wireless access point, i.e., does not accept the wireless access point.
Referring to fig. 3A-3B, a flow chart of a preferred embodiment of the wireless access point filtering method of the present invention is shown. The wireless access filtering method is applied to the electronic device 1 provided with the wireless access system 10 and comprises the following steps.
In step 301, the setting module 101 sets a state parameter P, which represents whether the electronic device 1 is located inside the vehicle, in the preferred embodiment, the initial value of the state parameter P is set to false, indicating that the electronic device 1 is located outside the vehicle. It is understood that the step 301 may be omitted when the initial value of the state parameter P is set and the process is performed again.
In step 303, the obtaining module 102 obtains the moving speed of the electronic device 1 and the distance of the object farthest from the electronic device 1 through the speed measuring module 11 and the distance sensing module 13, where the object may be an inner wall or a top wall of a vehicle.
In step 307, the setting module 101 sets the state parameter P to true, indicating that the electronic device 1 is located in a vehicle.
In step 311, the setting module 101 sets the status parameter P to false, indicating that the electronic device 1 is located outside the vehicle.
It is understood that the steps 301, 307, 311, and 313 may be omitted, and the subsequent processes may be performed directly according to the determination results of the determining module 103 in the steps 305 and 309, if the electronic device 1 is determined to be located inside the vehicle, the process proceeds to step 315, and if the electronic device 1 is determined to be located outside the vehicle, the process ends.
In step 315, the monitoring module 104 monitors the information periodically broadcast by the wireless access point through the receiving module 15, and obtains the signal frequency Fap of the information sent by the wireless access point and the signal frequency Fsta of the information actually received by the electronic device 1 according to the information.
In step 317, the calculating module 105 calculates the relative speed between the electronic device 1 and the wireless access point according to the signal frequency Fap of the information sent by the wireless access point and the signal frequency Fsta of the information actually received by the electronic device 1. In the preferred embodiment, the calculation module 105 calculates the Doppler shift according to the formula: (Fsta-Fap)/Fap ═ Vsta × cos θ/c, where Fap represents the signal frequency of the information sent by the AP, Fsta represents the signal frequency of the information actually received by the electronic device 1, θ represents the angle between the direction of the electromagnetic wave from the AP and the direction of the electronic device 1 (as shown in fig. 4A, where AP represents AP and STA represents the electronic device 1), and in the preferred embodiment, the angle θ is defined as zero, i.e., assuming that the direction of the electromagnetic wave from the information is the same as the direction of the electronic device 1 (as shown in fig. 4B), and c is the speed of light, which is equal to 2.99792458 × 108m/s, Vsta represents the relative velocity.
In step 319, the screening module 106 screens and filters the wireless aps according to the relative speed, specifically, the screening module 106 determines whether the relative speed is equal to zero, if the relative speed is equal to zero, step 321 is performed, and if the relative speed is not equal to zero, step 325 is performed.
In step 325, the screening module 106 further determines whether the relative speed is less than a predetermined relative speed (e.g., 2km/h), and if the relative speed is less than the predetermined relative speed, it indicates that the wireless ap can provide a relatively stable wireless connection, and the process proceeds to step 329. If the relative speed is greater than or equal to the predetermined relative speed, which indicates that the wireless access point cannot provide a relatively stable wireless connection, step 327 is entered.
In step 327, the filtering module 106 filters out the wireless access point, i.e. does not accept the wireless access point, and the process ends.
In step 329, the screening module 106 accepts the wireless access point, the screening module 106 may provide a list of the wireless access points accepted by the screening module 106 through the display 17, and the user may select a wireless access point that provides a more stable wireless connection according to the list, and the process is ended.
The wireless access point filtering system and method of the invention can screen out the wireless access points which can provide stable wireless connection, so that the electronic device 1 can obtain stable wireless connection even in a mobile state.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.
Claims (13)
1. A method for filtering wireless access points scanned by an electronic device located in a moving vehicle, the method comprising:
an obtaining step, obtaining the moving speed of the electronic device and the distance of an object which is farthest away from the electronic device;
judging whether the electronic device is positioned in the vehicle;
calculating, namely calculating the relative speed of the electronic device and the wireless access point when the electronic device is judged to be positioned in the vehicle; and
a screening step, screening and filtering the wireless access points according to the relative speed;
the judging step is to judge whether the moving speed is greater than a first preset speed and the distance is less than a preset distance, and if the moving speed is greater than the first preset speed and the distance is less than the preset distance, the electronic device is judged to be located in the vehicle.
2. The wireless access point filtering method of claim 1, wherein:
if the moving speed is less than a first preset speed or the distance is greater than a preset distance, the judging step further judges whether the moving speed is less than a second preset speed or not and the distance is greater than the preset distance or not, and if the moving speed is less than the second preset speed and the distance is greater than the preset distance, the electronic device is judged to be positioned outside the vehicle; and if the moving speed is greater than a second preset speed or the distance is less than the preset distance, returning to the acquiring step.
3. The wireless access point filtering method of claim 1, wherein: the method comprises the following steps:
monitoring information periodically broadcast by the wireless access point, and acquiring the signal frequency of the information sent by the wireless access point and the signal frequency of the information actually received by the electronic device according to the information;
the calculating step calculates the relative speed according to the signal frequency of the wireless access point for sending the information and the signal frequency of the electronic device for actually receiving the information.
4. The wireless access point filtering method of claim 3, wherein: the calculating step calculates the relative speed according to a formula (Fsta-Fap)/Fap ═ Vsta × cos θ/c, where Fsta represents a signal frequency at which the electronic device actually receives the information, Fap represents a signal frequency at which the wireless access point transmits the information, θ represents an angle between a traveling direction of an electromagnetic wave in which the wireless access point transmits the information and a moving direction of the electronic device, θ is defined as zero, c is a speed of light, and Vsta represents the relative speed.
5. The wireless access point filtering method of claim 3, wherein:
the screening step, judging whether the relative speed is equal to zero, if the relative speed is equal to zero, judging whether the wireless access point has not waited, if so, accepting the wireless access point; if not, after waiting for the preset time, repeating the monitoring step, the calculating step and the screening step.
6. The wireless access point filtering method of claim 5, wherein:
if the relative speed is not equal to zero, the screening step further determines whether the relative speed is less than a preset relative speed, if the relative speed is greater than or equal to the preset relative speed, the wireless access point is filtered, and if the relative speed is less than the preset relative speed, the wireless access point is accepted.
7. A wireless access point filtering system for filtering wireless access points scanned by an electronic device located in a moving vehicle, the system comprising:
the acquisition module is used for acquiring the moving speed of the electronic device and the distance between the electronic device and an object farthest away from the electronic device;
the judging module is used for judging whether the electronic device is positioned in the vehicle or not;
the calculating module is used for calculating the relative speed of the electronic device and the wireless access point when the judging module judges that the electronic device is positioned in the vehicle; and
the screening module is used for screening and filtering the wireless access points according to the relative speed;
the judging module judges whether the moving speed is greater than a first preset speed or not and whether the distance is smaller than a preset distance or not, and if the moving speed is greater than the first preset speed and the distance is smaller than the preset distance, the electronic device is judged to be located in the vehicle.
8. The wireless access point filtering system of claim 7, wherein:
if the moving speed is less than a first preset speed or the distance is greater than a preset distance, the judging module further judges whether the moving speed is less than a second preset speed or not and whether the distance is greater than the preset distance or not, and if the moving speed is less than the second preset speed and the distance is greater than the preset distance, the electronic device is judged to be positioned outside the vehicle; and if the moving speed is greater than a second preset speed or the distance is less than the preset distance, returning to the acquisition module.
9. The wireless access point filtering system of claim 7, wherein: the system further comprises:
the monitoring module is used for monitoring the information periodically broadcast by the wireless access point and acquiring the signal frequency of the information sent by the wireless access point and the signal frequency of the information actually received by the electronic device according to the information;
the calculating module calculates the relative speed according to the signal frequency of the wireless access point for sending the information and the signal frequency of the electronic device for actually receiving the information.
10. The wireless access point filtering system of claim 9, wherein: the calculating module calculates the relative speed according to a formula (Fsta-Fap)/Fap ═ Vsta × cos θ/c, where Fsta represents a signal frequency at which the electronic device actually receives the information, Fap represents a signal frequency at which the wireless access point transmits the information, θ represents an angle between a traveling direction of an electromagnetic wave in which the wireless access point transmits the information and a moving direction of the electronic device, θ is defined as zero, c is a speed of light, and Vsta represents the relative speed.
11. The wireless access point filtering system of claim 9, wherein:
the screening module judges whether the relative speed is equal to zero, if the relative speed is equal to zero, the screening module judges whether the wireless access point has not waited, and if the relative speed is equal to zero, the screening module accepts the wireless access point; if not, the monitoring module monitors the information periodically broadcast by the wireless access point after waiting for the preset time.
12. The wireless access point filtering system of claim 11, wherein:
if the relative speed is not equal to zero, the screening module further judges whether the relative speed is smaller than a preset relative speed, if the relative speed is larger than or equal to the preset relative speed, the wireless access point is filtered, and if the relative speed is smaller than the preset relative speed, the wireless access point is accepted.
13. An electronic device comprising a processor and a memory coupled to the processor, the memory for storing a wireless access point filtering system, the processor for executing the wireless access point filtering system, wherein the wireless access point filtering system is the system of any one of claims 7 to 12.
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| US8346478B2 (en) * | 2010-03-25 | 2013-01-01 | GM Global Technology Operations LLC | Location and mobile-adaptation of wireless access-points using map-based navigation |
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| EP2797366A1 (en) * | 2011-12-20 | 2014-10-29 | Huawei Technologies Co., Ltd. | Method, device and system for vehicular communication |
| CN103442413A (en) * | 2013-08-29 | 2013-12-11 | 惠州Tcl移动通信有限公司 | Wireless network setting method of mobile terminal |
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