CN113286335B - Frequency point switching method and device, storage medium and access point - Google Patents
Frequency point switching method and device, storage medium and access point Download PDFInfo
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- CN113286335B CN113286335B CN202110338724.7A CN202110338724A CN113286335B CN 113286335 B CN113286335 B CN 113286335B CN 202110338724 A CN202110338724 A CN 202110338724A CN 113286335 B CN113286335 B CN 113286335B
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- 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
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- 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
Abstract
The embodiment of the application discloses a frequency point switching method, a frequency point switching device, a storage medium and an access point, and belongs to the field of wireless communication. The access point measures the channel quality parameter value of each frequency point, compares the channel quality parameter value of the currently used frequency point, and based on the currently used channel quality parameter value, the channel quality parameter value of the frequency point with the optimal current channel quality and the channel quality parameter value of the last expected channel switching frequency point, the access point can execute the switching of the frequency point when the frequency of continuously meeting the frequency switching condition exceeds the counting threshold value, namely, the access point can not switch the frequency point at will, not only can correctly catch the change of the communication environment and timely make a response, but also can comprehensively consider the change of the communication environment, reduce the sensitivity to the change of the communication environment, avoid making unnecessary frequent frequency switching actions, and ensure the reliability and stability of data communication transmission.
Description
Technical Field
The present application relates to the field of wireless communications, and in particular, to a method, an apparatus, a storage medium, and an access point for switching frequency points.
Background
In the basic service set, there is a wireless access point (ap) and devices are allowed to access, and the accessed devices are called stations (stas). The access points and stations form a basic 802.11 wireless network and are capable of wireless communication. In the communication process, a plurality of factors influence the communication transmission quality to cause certain interference to data transmission.
Although the current 802.11 protocol provides a packet format for frequency point switching, in practical application, what index parameter should be referred to and what time should be cut is not described, and belongs to contents outside the protocol. And if the external environment where the two communication parties are located changes frequently, the access point can also switch the working frequency points frequently, so that the stability of data transmission is difficult to guarantee.
Disclosure of Invention
The frequency point switching method, the device, the storage medium and the access point provided by the embodiment of the application can avoid the access point from frequently switching the working frequency point. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a method for switching frequency points, where the method includes:
acquiring a channel quality parameter list est _ chan _ list (n) obtained after current switching evaluation is executed; wherein the channel quality parameter list est _ chan _ list (n) includes: a plurality of frequency points and channel quality parameter values of each frequency point, wherein n is an integer greater than or equal to 1;
determining a frequency point freq _ best (n) with the optimal channel quality in a channel quality parameter list est _ chan _ list (n);
acquiring channel quality parameter values of frequency points freq _ now (n) and freq _ now (n) currently used by an access point and a site;
judging whether the difference value between the channel quality parameter value of freq _ now (n) and the channel quality parameter value of the last expected switching frequency point freq _ hope (n-1) meets a first preset condition or not;
if not, continuously judging whether the difference value between the channel quality parameter value of freq _ now (n) and the channel parameter value of freq _ best (n) meets a second preset condition or not;
if yes, continuously judging whether freq _ best (n) is equal to freq _ hope (n-1);
if so, after the count value of the frequency-cutting counter is added with 1, continuously judging whether the count value of the frequency-cutting counter is greater than or equal to a count threshold value;
if yes, taking a preset initial frequency point as the expected switching frequency point freq _ hope (n) of this time, resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
In a second aspect, an embodiment of the present application provides a frequency point switching device, where the frequency point switching device includes:
an obtaining unit, configured to obtain a channel quality parameter list est _ chan _ list (n) obtained after performing current handover evaluation; wherein the channel quality parameter list est _ chan _ list (n) includes: a plurality of frequency points and channel quality parameter values of each frequency point, wherein n is an integer greater than or equal to 1;
a determining unit, configured to determine a frequency point freq _ best (n) with the best channel quality in a channel quality parameter list est _ chan _ list (n);
the acquiring unit is used for acquiring the channel quality parameter values of the frequency points freq _ now (n) and freq _ now (n) currently used by the access point and the station;
the switching unit is used for judging whether a difference value between a channel quality parameter value of freq _ now (n) and a channel quality parameter value of a last expected switching frequency point freq _ hope (n-1) meets a first preset condition or not;
if not, continuously judging whether the difference value between the channel quality parameter value of the freq _ now (n) and the channel parameter value of the freq _ best (n) meets a second preset condition or not;
if yes, continuously judging whether freq _ best (n) is equal to freq _ hope (n-1);
if so, after the count value of the frequency-cutting counter is added with 1, continuously judging whether the count value of the frequency-cutting counter is greater than or equal to a count threshold value;
if yes, taking a preset initial frequency point as the expected switching frequency point freq _ hope (n) of this time, resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
In a third aspect, embodiments of the present application provide a computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the above-mentioned method steps.
In a fourth aspect, an embodiment of the present application provides an access point, which may include: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the above-mentioned method steps.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
the method comprises the steps of periodically performing switching evaluation under the condition that communication connection is established between an access point and a station, performing channel quality evaluation on each frequency point to obtain a channel quality parameter list in the switching evaluation process, determining a frequency point with an optimal channel and a corresponding channel quality parameter value in the channel quality parameter list, calculating a difference value between a currently used frequency point and a pre-stored channel quality parameter value of a last expected switching frequency point, when the channel quality difference is determined to be larger according to the difference value, calculating a difference value between the currently used frequency point and the channel quality parameter value of the currently evaluated frequency point with the optimal channel quality, when the channel quality difference is determined to be larger according to the difference value, and when the channel quality difference is determined to continuously satisfy the frequency switching condition for multiple times based on a frequency switching counter, switching the currently used frequency point to the last expected switching frequency point. According to the method and the device, self-adaptive adjustment can be performed according to the environment in the communication process, the communication efficiency is guaranteed, the sensitivity to the change of the communication environment can be reduced, and unnecessary frequency point switching action is avoided being frequently executed, so that the communication reliability of both communication parties is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an architecture diagram of a wireless communication system provided by an embodiment of the present application;
fig. 2 is another schematic flow chart of a frequency point switching method according to an embodiment of the present application;
fig. 3 is another schematic diagram of a frequency point switching method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a frequency point switching device provided in the present application;
fig. 5 is a schematic structural diagram of an access point provided in the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a network architecture diagram of a wireless communication system. A wireless communication system includes at least one station and at least one access point. For example: the wireless fidelity communication system includes a station 10, an access point 11, an access point 12, and an access point 13. Before the station 10 does not establish a connection with any access point, the station 10 selects a frequency point to connect to the access point in a passive scanning or active scanning manner, where the frequency point is a frequency point of a center frequency of a frequency range, and corresponds to one channel, for example: station 10 establishes a connection with access point 11. In the case where station 10 establishes a communication connection with access point 11, station 10 periodically scans for a full channel based on an application trigger or a frame trigger. The station 10 performs a full channel scan based on a full channel set comprising a plurality of channels, the full channel set being related to the terminal's support capability and region. For example: the terminal supports 2.4G and 5G wifi channels, when the terminal is powered on, the terminal reads a region code from a Subscriber Identity Module (SIM) and communication capability information from a local memory, and obtains a full channel set associated with the region code and the communication capability information, where the full channel set includes 14 2.4G wifi channels and 24 5G wifi channels, the 2.4GHz wifi channel has 13 channels, and the distribution of the 13 channels is shown in table 1:
TABLE 1
After the access point establishes communication connection with the site, when the channel quality of the currently used frequency point is poor, the access point scans channel quality parameter values on each frequency point, and then switches to the frequency point with the optimal channel quality to establish communication connection with the site, however, when the communication environment changes frequently, the frequency points can be frequently switched between the access point and the site, and therefore the communication reliability is reduced.
The embodiment of the application provides a frequency point switching method which can be applied to an access point. The access point may be a router, a relay amplifier, a smartphone, a tablet, a gaming device, an AR (augmented reality) device, an automobile, a data storage device, an audio playback device, a video playback device, a notebook, a desktop computing device, a wearable device such as an electronic watch, an electronic glasses, an electronic helmet, an electronic bracelet, an electronic necklace, an electronic garment, or the like.
The frequency point switching method provided by the embodiment of the present application will be described in detail below with reference to fig. 2 to fig. 3. The frequency point based on the wireless network in the embodiment of the present application may be an access point shown in fig. 1.
Please refer to fig. 2, which is a schematic flow chart of a frequency point switching method according to an embodiment of the present application. As shown in fig. 2, the method of the embodiment of the present application may include the steps of:
s201, obtaining a channel quality parameter list est _ chan _ list (n) obtained after current switching evaluation is executed.
The access point periodically measures at each frequency point to evaluate the channel quality, and the period of the access point measurement may be determined according to actual requirements, which is not limited in the present application. The access point performs current handover evaluation to obtain a channel quality parameter list est _ chan _ list (n), where n is an integer greater than or equal to 1, the channel quality parameter list includes multiple frequency points and channel quality parameter values of the frequency points, for example, the channel quality parameter list est _ chan _ list (n) is expressed as (f 1, x 1), (f 2, x 2), …, (f 16, x 16), and the channel quality parameter list includes 16 frequency points and channel quality parameter values of the frequency points in total. The channel quality parameter value is used to indicate the quality of the channel at the frequency point, and the channel quality parameter value includes, but is not limited to: one or more of background noise, packet error rate, bit error rate, time delay, maximum interference energy, and channel busy time. The channel quality parameter value can be measured by an access point or a station or measured by the access point and the station, and the accuracy of evaluating the channel quality can be improved by measuring the channel quality parameter value on a certain frequency point by the access point and the station.
S202, determining a frequency point freq _ best (n) with optimal channel quality in a channel quality parameter list est _ chan _ list (n).
According to the channel quality parameter list, the frequency point freq _ best (n) with the optimal channel quality can be determined in the current channel quality parameter list by the access point according to the channel quality parameter value, wherein the frequency point and the channel quality parameter value have the association relationship and appear in pairs.
For example: the channel quality parameter is a time delay, and the channel quality parameter list includes: (f 1,0.5 s), (f 2,0.4 s), (f 3 (0.35 s), and f4 (0.45 s), it is easy to know that the frequency point with the best channel quality in the channel quality parameter list is f3.
S203, acquiring channel quality parameter values of frequency points freq _ now (n) and freq _ now (n) currently used by the access point and the site.
When the access point and the station establish WiFi connection, the access point and the station use the same frequency point, and the frequency points used by the access point and the station are located in the channel quality parameter list, that is, the access point can obtain the channel quality parameter value of freq _ now (n) in the channel quality parameter list after determining the currently used frequency point freq _ now (n).
S204, judging whether the channel quality parameter value of freq _ now (n) and the channel quality parameter value of the last expected switching frequency point freq _ hope (n-1) meet a first preset condition.
The access point prestores channel quality parameter values of frequency points freq _ hope (n-1) and freq _ hope (n-1) expected to be switched last time, and in an initial state, namely when n =1, freq _ hope (0) is an initial frequency point, the initial frequency point can be any one frequency point included in a channel quality parameter list, the channel quality parameter value of freq _ hope (0) is an initial channel quality parameter value, the initial channel quality parameter value generally indicates that a channel is poor, and the value can be determined according to actual requirements, which is not limited in the application.
Wherein, the first preset condition indicates that the channel quality difference between freq _ now (n) and freq _ hope (n-1) is small, for example: when the channel quality parameter is background noise, the first preset condition is as follows: the absolute value of the difference in background noise between freq _ now (n) and freq _ hope (n-1) is less than the decibel threshold (e.g., 2 dB);
and S205, if not, continuously judging whether the difference value between the channel quality parameter value of the freq _ now (n) and the channel parameter value of the freq _ best (n) meets a second preset condition.
When the determination result in S204 is negative, it is continuously determined whether the difference between the channel quality parameter value of freq _ now (n) and the channel parameter value of freq _ best (n) satisfies a second preset condition, where the second preset condition generally indicates that the channel quality difference between two frequency points is large. For example: when the channel quality parameter is background noise, the second predetermined condition is whether the difference between the background noise of freq _ now (n) and freq _ best (n) is greater than a decibel threshold (e.g., 6 dB).
S206, if yes, continuing to judge whether the freq _ best (n) is equal to the freq _ hope (n-1).
If the determination result in S205 is yes, it is continuously determined whether the frequency point freq _ best (n) with the best current channel quality is the same as the frequency point freq _ hope (n-1) expected to be switched last time.
And S207, if so, adding 1 to the count value of the frequency-cutting counter, and then continuously judging whether the count value of the frequency-cutting counter is greater than or equal to the count threshold value.
When the initial value of the frequency-cutting counter is 0, that is, n =1, the initial value of the frequency-cutting counter is 0.
And S208, if so, resetting the current expected switching frequency point freq _ hope (n) as an initial frequency point, resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
For example: the access point carries the switching time in the beacon frame, and the station switches the frequency point to freq _ hope (n-1) according to the switching time.
By implementing the embodiment of the application, before the access point does not establish communication with the station, the access point can only refer to the channel quality measurement result measured by the access point, the access point can refer to the channel quality measurement results of the access point and the station at the same time after establishing communication connection with the station, and periodically perform switching evaluation, in the switching evaluation process, a channel quality parameter list obtained by performing channel quality evaluation on each frequency point is determined, the frequency point with the optimal channel and the corresponding channel quality parameter value are determined in the channel quality parameter list, the difference value between the channel quality parameter values of the currently used frequency point and the prestored frequency point expected to be switched is calculated, when the channel quality difference is determined to be larger according to the difference value, and when the frequency switching condition is determined to be continuously satisfied for multiple times based on a frequency switching counter, the currently used frequency point is switched to the previous expected switching frequency point. The method and the device can adapt to the change of the channel environment and automatically switch to the optimal channel to improve the communication efficiency, reduce the sensitivity to the change of the communication environment and avoid frequently executing unnecessary frequency point switching actions, thereby ensuring the communication reliability of both communication parties.
Referring to fig. 3, another schematic flow chart of a frequency point switching method is provided in the embodiment of the present application. As shown in fig. 3, the method of the embodiment of the present application may include the steps of:
s301, the access point and the station establish WiFi connection.
Before the access point and the station establish the WiFi connection, the access point scans the channel quality parameter value (such as background noise) on each frequency point, and then establishes the WiFi connection with the station on the frequency point with the best channel quality.
S302, obtaining a channel quality parameter list est _ brg _ list (n) obtained after current switching evaluation is executed.
After WiFi establishment is established between the access point and the station, the access point and the station periodically perform channel quality detection, the station reports measurement results to the access point, the access point periodically performs switching evaluation, and in the switching evaluation process, the access point comprehensively considers the channel quality measurement results of the access point and the station on each frequency point included in a working frequency point list and evaluates the channel quality of each frequency point.
In one possible embodiment, the method of obtaining a channel quality list comprises:
determining a measurement time interval associated with the current handover evaluation;
in the measurement time interval, acquiring a channel quality parameter value ap _ chan _ list (n) measured by the access point on each frequency point, and acquiring a channel quality parameter value sta _ chan _ list (n) measured by the station on each frequency point;
and obtaining a channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n), and determining a frequency point freq _ best (n) with the optimal channel quality in the channel quality parameter list est _ chan _ list (n).
The method comprises the steps that a measurement time interval is a time period, the duration of the measurement time interval is smaller than the duration of executing switching evaluation, an access point and a station are both configured with the same working frequency point list, the access point and the station measure channel quality parameter values on various frequency points, the channel quality parameter value measured by the access point is ap _ chan _ list (n), the channel quality parameter value measured by the station is sta _ chan _ list (n), and the channel quality parameter value measured by the station can be weighted and averaged to obtain a final channel quality parameter list. The embodiment comprehensively considers the channel measurement results of the access point and the station, so that the accuracy of channel evaluation can be improved, and more accurate reference is improved for subsequent frequency point switching.
Further, the obtaining of the channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n) includes:
determining a first receive duty cycle of the access point within the measurement time interval and a second receive duty cycle of the station within the measurement time interval;
according to the first receiving duty ratio and the second receiving duty ratio, carrying out weighted average on ap _ chan _ list (n) and sta _ chan _ list (n) to obtain a receiving channel quality parameter list;
determining a first transmit duty cycle of the access point within the measurement time interval and a second transmit duty cycle of the station within the measurement time interval;
according to the first sending duty ratio and the second sending duty ratio, carrying out weighted average on ap _ chan _ list and sta _ chan _ list to obtain a sending channel quality parameter list;
and carrying out weighted average on the receiving channel quality parameter list and the sending channel quality parameter list to obtain a final channel quality parameter list est _ chan _ list (n).
Wherein, the first receiving duty cycle represents a proportional value corresponding to a duration of the access point performing the receiving process in the measurement time interval, and the second receiving duty cycle represents a proportional value corresponding to a duration of the station performing the receiving process in the measurement time interval, for example: the duration of the measurement time interval is 1 second, the duration of the access point performing the receiving process in the measurement time interval is 0.3 second, then the first receiving duty cycle is 0.3, the duration of the station performing the receiving process in the measurement time interval is 0.7 second, then the second receiving duty cycle is 0.7. Correspondingly, the first sending duty cycle represents a proportional value corresponding to the duration of the access point executing the sending process in the measuring time interval, and the second sending duty cycle represents a proportional value corresponding to the duration of the station executing the sending process in the measuring time interval, so that it is easy to know that the station is executing the receiving process if the access point is executing the sending process in the measuring time interval, and the station is executing the sending process if the access point is executing the receiving process, so that it can be known that the first receiving duty cycle is equal to the second sending duty cycle, and the second receiving duty cycle is equal to the first sending duty cycle. The receiving channel quality parameter list and the sending channel quality parameter list can be calculated according to the following formulas:
ap _ chan _ list (n) first transmit duty cycle + sta _ chan _ list (n) second transmit duty cycle = rx _ chan _ list (n);
ap _ chan _ list (n) first transmit duty cycle + sta _ chan _ list (n) second transmit duty cycle = tx _ chan _ list (n).
And then carrying out weighted average on rx _ chan _ list (n) and tx _ chan _ list (n) to obtain a final channel quality parameter list. Optionally, the receiver is relatively sensitive to the channel quality parameter during communication, so the weight of rx _ chan _ list (n) based on the estimation of the reception duty ratio is usually set to be larger than tx _ chan _ list (n), for example: the weight of rx _ chan _ list (n) is 67%, the weight of tx _ chan _ list (n) is 33%, and reasonable weights are set to have close relation to the frequency points reasonably and timely.
S304, acquiring background noises of frequency points freq _ now (n) and freq _ now (n) currently used by the access point and the station.
The background noise of the frequency points freq _ now (n) and freq _ now (n) currently used by the access point and the station is obtained, after the access point determines the currently used frequency point, the background noise of the currently used frequency point can be measured in real time, and the background noise corresponding to the currently used station can be obtained in the channel quality parameter list of S303
S305, judging whether the difference value between the background noise of freq _ now (n) and the background noise of the last expected switching frequency point freq _ hope (n-1) is less than the first branch Bei Yuzhi.
The access point stores the previous expected switching frequency point freq _ hope (n-1), when n =2, namely when switching evaluation is performed for the first time, freq _ hope (0) is a preset initial frequency point, the background noise value of freq _ hope (0) is also a preset initial value, the access point calculates the difference between the background noise of the currently used frequency point freq _ now (n) and the stored background noise value of the previous expected switching frequency point freq _ hope (n-1), judges whether the absolute value of the difference is smaller than the first branch Bei Yuzhi (for example, 2 dB) or not, if the judgment result is yes, S306 is executed, and if the judgment result is no, S307 is executed. The purpose of executing the determination process in S305 is to: when the background noise corresponding to the evaluated freq _ best (n) is not much different from the background noise of the freq _ hope (n-1) obtained by the last evaluation, the freq _ best (n) is updated to be freq _ hope (n-1), namely, the frequency point freq _ hope (n-1) to which the user wants to switch last time is considered to be the cleanest, so the user still wants to switch the frequency point this time.
S306, updating freq _ best (n) to freq _ hope (n-1), and updating the background noise value of freq _ best (n) to the background noise value of freq _ hope (n-1).
The access point updates the frequency point with the optimal current channel quality to freq _ hope (n-1), that is, the frequency point is expected to be switched last time, and the corresponding background noise is also updated.
S307, judging whether the difference value of the background noise of the freq _ now (n) and the background noise of the freq _ best (n) is larger than or equal to the second division Bei Yuzhi.
Calculating the difference between the background noise of the currently used frequency point and the background noise of the frequency point with the optimal current channel, judging whether the difference is greater than or equal to a second score Bei Yuzhi (such as 6 dB), and if so, executing S309; if the judgment result is negative, S308 is executed.
And S308, subtracting 1 from the count value of the frequency cutting counter.
The initial value of the frequency cutting counter is 0, and the frequency cutting counter is increased or decreased by taking 1 as a step length. When the determination result in S307 is no, the count value of the frequency-cut counter is decremented by 1 until the count value becomes 0, and then the next switching evaluation is performed.
S309, judge whether freq _ now (n) and freq _ best (n-1) are the same.
The access point judges whether the currently used frequency point is the same as the last expected switching frequency point, if so, the S310 is executed, and if not, the S311 is executed.
And S310, adding 1 to the count value of the frequency cutting counter.
S311, assign freq _ best (n) to freq _ hope (n), assign the background noise of freq _ best (n) to the background noise of freq _ hope (n), and set the counter value of the frequency-cutting counter to 1.
The access point takes the frequency point with the optimal current channel quality as the expected switching frequency point, corresponding background noise is updated, then the counting value of the frequency switching counter is set to be 1, and next switching evaluation is waited to be executed.
And S312, whether the count value of the frequency cutting counter is larger than or equal to the count threshold value.
The access point determines whether the count value of the frequency-cut counter is greater than or equal to a count threshold, and the size of the count threshold can be determined according to actual requirements, which is not limited in the present application. If the determination result is yes, S313 is executed, and if the determination result is no, S314 is executed.
S313, resetting freq _ hope (n) to an initial frequency point, resetting background noise of freq _ hope (n) to an initial decibel value, resetting the count value of the frequency-switching counter to 0, and switching to the currently used frequency point freq _ now (n) to freq _ hope (n-1) after a preset time length.
The access point takes the initial frequency point as the expected switching frequency point freq _ hope (n), resets the background noise of the expected switching frequency point freq _ hope (n) to an initial value, and resets the count value of the frequency switching counter to 0. The preset time period may be determined according to actual requirements, for example: after the access point transmits 10 beacon frames, the access point and the station switch simultaneously for freq _ hope (n-1), and then perform the next switch evaluation.
And S314, executing next switching evaluation.
Wherein the access point periodically performs handover evaluation according to the procedures of S302 to S313.
By implementing the embodiment of the application, the access point and the station Zhou Xing can measure the channel quality parameter value of each frequency point, compare the channel quality parameter values of the currently used frequency points, and evaluate the switching condition based on the currently used channel quality parameter value, the channel quality parameter value of the frequency point with the optimal current channel quality and the channel quality parameter value of the expected channel switching frequency point last time.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Please refer to fig. 4, which shows a schematic diagram of a frequency point structure provided in an exemplary embodiment of the present application. The apparatus may be implemented as all or a portion of the terminal in software, hardware, or a combination of both. Frequency point 4 (hereinafter, referred to as device 4) includes acquisition section 401, determination section 402, and switching section 403.
An obtaining unit 401, configured to obtain a channel quality parameter list est _ chan _ list (n) obtained after performing current handover evaluation; wherein the channel quality parameter list est _ chan _ list (n) includes: a plurality of frequency points and channel quality parameter values of each frequency point, wherein n is an integer greater than or equal to 1;
a determining unit 402, configured to determine a frequency bin freq _ best (n) with an optimal channel quality in a channel quality parameter list est _ chan _ list (n);
the acquiring unit 401 is configured to acquire frequency points freq _ now (n) and channel quality parameter values of freq _ now (n) currently used by the access point and the station;
a switching unit 403, configured to determine whether a difference between a channel quality parameter value of freq _ now (n) and a channel quality parameter value of a previous expected switching frequency point freq _ hope (n-1) satisfies a first preset condition;
if not, continuously judging whether the difference value between the channel quality parameter value of freq _ now (n) and the channel parameter value of freq _ best (n) meets a second preset condition or not;
if yes, continuously judging whether freq _ best (n) is equal to freq _ hope (n-1);
if so, after the count value of the frequency-cutting counter is added with 1, continuously judging whether the count value of the frequency-cutting counter is greater than or equal to a count threshold value;
if yes, taking a preset initial frequency point as the expected switching frequency point freq _ hope (n), resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
In one or more embodiments, determining unit 402 is further configured to:
updating freq _ hope (n) to freq _ best (n) and updating the channel quality parameter value of freq _ hope (n) to the channel quality parameter value of freq _ best (n) if the difference between the channel quality parameter value of freq _ now (n) and the channel quality parameter value of freq _ hope (n) satisfies the first preset condition.
In one or more embodiments, determining unit 402 is further configured to:
and if the difference value between the channel parameter value of the freq _ now (n) and the channel parameter value of the freq _ best (n) does not meet the second preset condition, subtracting 1 from the count value of the frequency switching counter, and performing n +1 switching evaluations.
In one or more embodiments, determining unit 402 is further configured to:
if freq _ best (n) is not equal to freq _ best (n-1), updating freq _ best (n) to freq _ best (n), updating the channel quality parameter value of freq _ best (n) to the channel quality parameter value of freq _ best (n), and resetting the count value of the frequency-cut counter to 1.
In one or more embodiments, the determining unit 402 is further configured to:
and if the count value of the frequency switching counter is smaller than the count threshold, executing the (n + 1) th switching evaluation.
In one or more embodiments, the obtaining a channel quality parameter list est _ chan _ list (n) obtained after performing the current handover evaluation includes:
determining a measurement time interval associated with the current handover evaluation;
in the measurement time interval, acquiring a channel quality parameter value ap _ chan _ list (n) measured by the access point on each frequency point, and acquiring a channel quality parameter value sta _ chan _ list (n) measured by the station on each frequency point;
and obtaining a channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n).
In one or more embodiments, the obtaining a channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n) includes:
determining a first receive duty cycle of the access point within the measurement time interval and a second receive duty cycle of the station within the measurement time interval;
according to the first receiving duty ratio and the second receiving duty ratio, carrying out weighted average on ap _ chan _ list (n) and sta _ chan _ list (n) to obtain a receiving channel quality parameter list rx _ chan _ list (n);
determining a first transmit duty cycle of the access point within the measurement time interval and a second transmit duty cycle of the station within the measurement time interval;
carrying out weighted average on ap _ chan _ list and sta _ chan _ list according to the first sending duty ratio and the second sending duty ratio to obtain a sending channel quality parameter list tx _ chan _ list (n);
and carrying out weighted average on the receiving channel quality parameter list and the sending channel quality parameter list to obtain a final channel quality parameter list est _ chan _ list (n).
It should be noted that, when the frequency point 4 provided in the foregoing embodiment executes the frequency point switching method, only the division of each functional module is illustrated, and in practical applications, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the touch operation response device provided by the above embodiment and the frequency point switching method embodiment belong to the same concept, and the detailed implementation process thereof is referred to as the method embodiment, which is not described herein again.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
An embodiment of the present application further provides a computer storage medium, where the computer storage medium may store a plurality of instructions, where the instructions are suitable for being loaded by a processor and executing the method steps in the embodiments shown in fig. 2 to fig. 3, and a specific execution process may refer to specific descriptions of the embodiments shown in fig. 2 to fig. 3, which is not described herein again.
The present application further provides a computer program product, where at least one instruction is stored, and the at least one instruction is loaded and executed by the processor to implement the frequency point switching method according to the above embodiments.
Referring to fig. 5, which shows a schematic structural diagram of an access point according to an embodiment of the present application, where the access point 9 may be used to implement the frequency point switching method provided in the foregoing embodiment. Specifically, the method comprises the following steps:
access point 9 includes memory 920, processor 980 and WiFi module 970, which is a wireless module for this application.
The memory 920 may be used to store software programs and modules, and the processor 980 performs various functional applications and data processing by operating the software programs and modules stored in the memory 920. The memory 920 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the access point, and the like. Further, the memory 920 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 920 may also include a memory controller to provide the processor 980 and the input unit 930 with access to the memory 920.
The processor 980 is a control center of the access point, connects various parts of the entire access point using various interfaces and lines, performs various functions of the access point and processes data by running or executing software programs and/or modules stored in the memory 920 and using data stored in the memory 920, thereby performing overall monitoring of the access point. Optionally, processor 980 may include one or more processing cores; processor 980 may, among other things, integrate an application processor, which primarily handles operating systems, user interfaces, and applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 980.
WiFi belongs to short-range wireless transmission technology, and the access point can help the user to send and receive e-mail, browse web pages, access streaming media, etc. through the WiFi module 970, which provides wireless broadband internet access for the user.
Specifically, in the present embodiment, the access point 9 includes a memory and one or more programs, where the one or more programs are stored in the memory and configured to be executed by one or more processors, and the one or more programs include instructions for executing the frequency point switching method described in fig. 2 to 3.
The embodiment of the present application and the method embodiments of fig. 2 to 3 are based on the same concept, and the technical effects brought by the embodiment are also the same, and the specific process may refer to the method embodiments of fig. 2 to 3, which are not described herein again.
Optionally, the access point 9 further comprises a display unit 940. The display unit 940 may be used to display information input by or provided to the user and various graphical user interfaces of the access point, which may be made up of graphics, text, icons, video, and any combination thereof. The Display unit 940 may include a Display panel 941, and optionally, the Display panel 941 may be configured in the form of an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), or the like. Further, the touch device 931 may overlay the display panel 941, and when the touch device 931 detects a touch operation thereon or nearby, the touch device transmits the touch operation to the processor 980 to determine the type of touch event, and then the processor 980 provides a corresponding visual output on the display panel 941 according to the type of touch event. Although in FIG. 5, touch device 931 and display panel 941 are shown as two separate components to implement input and output functions, in some embodiments, touch device 931 and display panel 941 may be integrated to implement input and output functions.
Optionally, the access point 9 further includes: an input unit 930. The input unit 930 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. Specifically, the input unit 930 may include a touch device 931 (e.g., a touch screen, a touch pad, or a touch frame). The touch device 931, also referred to as a touch screen or a touch pad, may collect a touch operation performed by a user on or near the touch device 931 (e.g., a user operating the touch device 931 or near the touch device 931 using any suitable object or accessory such as a finger, a stylus, etc.) and drive the corresponding connecting device according to a preset program. Alternatively, the touch device 931 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 980, and can receive and execute commands sent by the processor 980. In addition, the touch device 931 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave.
Optionally, the station may include RF (Radio Frequency) circuitry 910, memory 920 including one or more computer-readable storage media, an input unit 930, a display unit 940, a sensor 950, audio circuitry 960, a WiFi (wireless fidelity) module 960, a processor 980 including one or more processing cores, and a power supply 990, among other components. Those skilled in the art will appreciate that the access point architecture shown in fig. 5 does not constitute a limitation on access points, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components. Wherein:
the RF circuit 910 may be used for receiving and transmitting signals during a message transmission or call, and in particular, for receiving downlink information from a base station and then processing the received downlink information by the one or more processors 980; in addition, data relating to uplink is transmitted to the base station. In general, RF circuit 910 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, an LNA (low noise amplifier), a duplexer, and the like. In addition, the RF circuit 910 may also communicate with networks and other devices via wireless communication. The wireless Communication may use any Communication standard or protocol, including but not limited to 3GPP (3 rd Generation Partnership Project, 3GPP for Short), 3GPP2 (3 rd Generation Partnership Project 2, 3GPP2 for Short), UMTS (Universal Mobile Telecommunications System, UMTS for Short), LTE (Long Term Evolution, LTE for Short), LTE-a (LTE-Advanced, LTE-a for Short), WIMAX (Worldwide Access for Microwave Access, WIMAX), HSDPA (High Speed Downlink packet Access, HSDPA), HSDPA (High Speed Uplink packet Access, TDMA for Short), WCDMA (GSM for Short, WCDMA for Short, wideband Code Division multiple Access, WCDMA for Short, cdma for Short, and multiple Access, WCDMA for Short, multiple Access, and multiple Access for Short.
Optionally, the access point 9 may also include at least one sensor 950, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel 941 according to the brightness of ambient light, and a proximity sensor that may turn off the display panel 941 and/or backlight when the access point moves to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), detect the magnitude and direction of gravity when the device is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for identifying the attitude of an access point, and related functions (such as pedometer and tapping) for vibration identification; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be further configured by the access point, detailed description is omitted here.
Optionally, the ap 9 further includes a power supply 990 (e.g., a battery) for supplying power to various components, wherein the power supply may be logically connected to the processor 980 via a power management system, such that functions of managing charging, discharging, and power consumption may be performed via the power management system. Power supply 990 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and the like.
Optionally, the access point 9 may further include a camera 991, a bluetooth module, and the like, where the camera 991 is configured to expose the surrounding environment to obtain a frame image, and in one manner, the camera 991 transmits parameters of the frame image obtained by exposure to the processor 980 so that the processor 980 performs processing such as denoising and enhancing on the frame image to generate a picture that can be displayed to the user; in yet another alternative, the camera 991 may be equipped with an image processor chip, which may perform a preliminary processing on the frame of image, and then transmit the processed data to the processor 980 to enable the processor 980 to ultimately produce an image that can be displayed to a user. Further, the number of the cameras 991 may be one or more.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A frequency point switching method is characterized in that the method comprises the following steps:
acquiring a channel quality parameter list est _ chan _ list (n) obtained after current switching evaluation is executed; wherein the channel quality parameter list est _ chan _ list (n) includes: a plurality of frequency points and channel quality parameter values of each frequency point, wherein n is an integer greater than or equal to 1;
determining a frequency point freq _ best (n) with the optimal channel quality in a channel quality parameter list est _ chan _ list (n);
acquiring channel quality parameter values of frequency points freq _ now (n) and freq _ now (n) currently used by an access point and a site;
judging whether the difference value between the channel quality parameter value of freq _ now (n) and the channel quality parameter value of the last expected switching frequency point freq _ hope (n-1) meets a first preset condition or not;
if not, continuously judging whether the difference value between the channel quality parameter value of freq _ now (n) and the channel parameter value of freq _ best (n) meets a second preset condition or not;
if yes, continuously judging whether freq _ best (n) is equal to freq _ hope (n-1);
if so, after the count value of the frequency-cutting counter is added with 1, continuously judging whether the count value of the frequency-cutting counter is greater than or equal to a count threshold value;
if yes, taking a preset initial frequency point as the expected switching frequency point freq _ hope (n) of this time, resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
2. The method of claim 1, further comprising:
updating freq _ hope (n) to freq _ best (n) and updating the channel quality parameter value of freq _ hope (n) to the channel quality parameter value of freq _ best (n) if the difference between the channel quality parameter value of freq _ now (n) and the channel quality parameter value of freq _ hope (n) satisfies the first preset condition.
3. The method of claim 1, further comprising:
and if the difference value between the channel parameter value of the freq _ now (n) and the channel parameter value of the freq _ best (n) does not meet the second preset condition, subtracting 1 from the count value of the frequency switching counter, and performing n +1 switching evaluations.
4. The method of claim 1, further comprising:
if freq _ best (n) is not equal to freq _ best (n-1), updating freq _ best (n) to freq _ best (n), updating the channel quality parameter value of freq _ best (n) to the channel quality parameter value of freq _ best (n), and resetting the count value of the frequency-cut counter to 1.
5. The method of claim 1, further comprising:
and if the count value of the frequency switching counter is smaller than the count threshold, executing the (n + 1) th switching evaluation.
6. The method of claim 1, wherein obtaining the channel quality parameter list est _ chan _ list (n) obtained after performing the current handover evaluation comprises:
determining a measurement time interval associated with the current handover evaluation;
in the measurement time interval, acquiring a channel quality parameter value ap _ chan _ list (n) measured by the access point on each frequency point, and acquiring a channel quality parameter value sta _ chan _ list (n) measured by the station on each frequency point;
and obtaining a channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n).
7. The method of claim 6, wherein obtaining the channel quality parameter list est _ chan _ list (n) according to ap _ chan _ list (n) and sta _ chan _ list (n) comprises:
determining a first receive duty cycle of the access point for the measurement time interval and a second receive duty cycle of the station for the measurement time interval;
according to the first receiving duty ratio and the second receiving duty ratio, carrying out weighted average on ap _ chan _ list (n) and sta _ chan _ list (n) to obtain a receiving channel quality parameter list rx _ chan _ list (n);
determining a first transmit duty cycle of the access point within the measurement time interval and a second transmit duty cycle of the station within the measurement time interval;
carrying out weighted average on ap _ chan _ list and sta _ chan _ list according to the first sending duty ratio and the second sending duty ratio to obtain a sending channel quality parameter list tx _ chan _ list (n);
and carrying out weighted average on the receiving channel quality parameter list and the sending channel quality parameter list to obtain a final channel quality parameter list est _ chan _ list (n).
8. A frequency point switching apparatus, comprising:
an obtaining unit, configured to obtain a channel quality parameter list est _ chan _ list (n) obtained after performing current handover evaluation; wherein the channel quality parameter list est _ chan _ list (n) includes: a plurality of frequency points and channel quality parameter values of each frequency point, wherein n is an integer greater than or equal to 1;
a determining unit, configured to determine a frequency point freq _ best (n) with an optimal channel quality in a channel quality parameter list est _ chan _ list (n);
the acquiring unit is used for acquiring the channel quality parameter values of the frequency points freq _ now (n) and freq _ now (n) currently used by the access point and the station;
the switching unit is used for judging whether a difference value between a channel quality parameter value of freq _ now (n) and a channel quality parameter value of a last expected switching frequency point freq _ hope (n-1) meets a first preset condition or not;
if not, continuously judging whether the difference value between the channel quality parameter value of the freq _ now (n) and the channel parameter value of the freq _ best (n) meets a second preset condition or not;
if yes, continuously judging whether freq _ best (n) is equal to freq _ hope (n-1);
if so, after adding 1 to the count value of the frequency-cutting counter, continuously judging whether the count value of the frequency-cutting counter is greater than or equal to the count threshold value;
if yes, taking a preset initial frequency point as the expected switching frequency point freq _ hope (n) of this time, resetting the channel quality parameter value of the freq _ hope (n) as the initial channel quality parameter value, and switching the frequency point freq _ now (n) currently used by the access point and the station to freq _ hope (n-1) after a preset time length.
9. A computer storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to perform the method steps according to any one of claims 1 to 7.
10. An access point, comprising: a processor, a memory, and a wireless module; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps according to any of claims 1-7.
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