CN103596228B - A kind of wireless channel switching method and device - Google Patents
A kind of wireless channel switching method and device Download PDFInfo
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Abstract
Embodiments providing a kind of wireless channel switching method and device, in the method, AP is set the scanning of duration successively under promiscuous mode according to predetermined period to current operating channel and part inoperative channel, obtains the scanning information of each channel；According to the detection response message in scanning information, and from the corresponding probe requests thereby message sent in each setting duration, determine the response time of each channel, and the response time determined is not more than the channel of setting time as candidate channel；According to the re-transmission message flag position, node identification and the message transmission rate that carry in the data message in the scanning information of candidate channel, calculate corresponding channel quality assessment value, and the channel quality assessment value being switched to self calculate is not less than in the candidate channel setting threshold value.Current operating channel and part inoperative channel are scanned under promiscuous mode by the present invention by AP, switch on the preferable channel of channel quality, and switching accuracy rate is higher.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of wireless channel switching method and device.
Background technology
For WLAN (Wireless Local Area Network, WLAN), channel right and wrong
The most rare resource, each access point AP is only capable of and is operated in as on its channel distributed.Due to WLAN
There are the most possible interference source, such as radar, microwave, other AP being currently in use and ends in working frequency range
The interference etc. that the end common busy channel of STA produces, they are by the normal work of interfering AP, so,
By the channel of AP is switched over, to ensure that each AP is operated on the channel that channel quality is optimum,
Reduce as far as possible and avoid adjacent-channel interference, it appears be particularly important.
At present, following flow process is generally used to realize the switching of wireless channel: AP is successively according to predetermined period
Current operating channel and default inoperative channel are set the scanning of duration, obtain the scanning of each channel
Information, the scanning information of each channel includes the every other AP that AP receives in each setting duration
That broadcasts carries beacon (Beacon) message, and these Beacon messages all carry received signal strength indicator
(Received Signal Strength Indication, RSSI) value；Then, AP is respectively to each letter obtained
The RSSI value that Beacon message in the scanning information in road carries is carried out averaging computing, and will calculate
RSSI meansigma methods as the channel quality assessment value of each channel, this channel quality assessment value is for table
Reference road occupied extent index value；Finally, self is switched to channel quality assessment value and is not less than by AP
Set on the channel of threshold value.
It should be noted that AP is when performing above-mentioned switching flow, it is to work under non-motley pattern always
, in this mode, AP only receives the message that destination address is self, and certainly, AP is non-except being operable with
Under promiscuous mode, may also be operated under promiscuous mode, in this case, AP receives owning through it
Data message, the most not only receiving destination address is the message of self, also receives the report that destination address is not self
Literary composition.It addition, in above-mentioned flow process, AP predetermined period, setting duration and setting threshold value all can be according to WLAN
Practical operation situation carry out value.
Below in conjunction with following example, above-mentioned switching flow is described in detail:
Assuming that AP is currently operating on 1 channel, predetermined period is 100ms, a length of 10ms during setting, in advance
If inoperative channel be 6 channels and 11 channels, it is assumed that AP starts to perform above-mentioned switching flow from 0ms,
So, concrete execution flow process is as follows:
1 channel is scanned by AP, terminates when scanning 10ms, and AP obtains and receives in this 10ms
All Beacon messages, then proceed to normally work in remaining 90ms, so, arrive
During 100ms (i.e. first predetermined period), AP is switched to 6 channels, starts to be scanned 6 channels,
After scanning 10ms (when i.e. scanning 110ms), AP also obtains all Beacon received in this 10ms
Message, then, AP is switched to 1 channel again, the normally work in 90 seconds of the residue in this predetermined period.
It follows that when arriving 200ms (i.e. second predetermined period), AP is switched to 11 channels, start
Being scanned 11 channels, after scanning 10ms (when i.e. scanning 210ms), AP obtains again at this
The all Beacon messages received in 10ms, then, AP is switched to 1 channel again；Follow-up AP is according to this
The Beacon message that 3 scanning obtains, the channel quality counting 1 channel, 6 channels and 11 channels is commented
Valuation, it is assumed that count 1 channel and be unsatisfactory for above-mentioned Rule of judgment, 6 channels and 11 channels and be satisfied by above-mentioned sentencing
Broken strip part, in this case, AP switches to 6 channels, it is possible to be switched to 11 channels, i.e. from 6 letters
Road and 11 channels select one.
From above-mentioned flow process it can be seen that AP needs to be switched to which high-quality channel, mainly by channel matter
Amount assessed value determines, and this channel quality assessment value is by the RSSI value of other AP in respective channel
Embody, owing to other AP are in the case of by some interference sources interference such as microwave ovens, it is impossible to from AP
RSSI value embody, this results in the channel that the RSSI value according to AP determines may not be letter
Road optimal quality, and then the accuracy rate causing channel to switch is relatively low.
Summary of the invention
Embodiments provide a kind of wireless channel switching method and device, cut in order to solve existing channel
The problem that the accuracy rate changed is relatively low.
Based on the problems referred to above, a kind of wireless channel switching method that the embodiment of the present invention provides, including:
AP successively according to predetermined period under promiscuous mode to current operating channel and preset inoperative channel
Being set the scanning of duration, obtain the scanning information of each channel, the scanning information of each channel includes described
All detection response messages that AP receives in each setting duration, and all carry re-transmission message mark
The data message of will position, node identification and message transmission rate；
According to the detection response message in the scanning information of each channel obtained, with from during in each setting
The corresponding probe requests thereby message sent in long, determines the response time of each channel, and the response that will determine
Time is not more than the channel of setting time as candidate channel；
The re-transmission message flag position carried in the data message in scanning information according to described candidate channel, joint
Point identification and message transmission rate, calculate the channel quality assessment value of described candidate channel, and self switched
To the channel quality assessment value calculated not less than in the candidate channel setting threshold value.
A kind of wireless channel switching device that the embodiment of the present invention provides, including:
Scan module, for successively according to predetermined period under promiscuous mode to current operating channel and preset
Inoperative channel is set the scanning of duration, obtains the scanning information of each channel, the scanning letter of each channel
Breath includes all detection response messages that described AP receives in each setting duration, and all carries
There are re-transmission message flag position, node identification and the data message of message transmission rate；
Determine module, the detection response message in the scanning information according to each channel obtained, and institute
State the corresponding probe requests thereby message that AP sends in each setting duration, determine the response time of each channel,
And the response time determined is not more than the channel of setting time as candidate channel；
Computing module, for according to the re-transmission carried in the data message in the scanning information of described candidate channel
Message flag position, node identification and message transmission rate, calculate the channel quality assessment value of described candidate channel；
Handover module, the channel quality assessment value for described device is switched to calculate is not less than setting threshold
In the candidate channel of value.
The beneficial effect of the embodiment of the present invention includes:
A kind of wireless channel switching method of embodiment of the present invention offer and device, in the method, AP depends on
Secondary according to predetermined period under promiscuous mode to current operating channel and preset inoperative channel be set
The scanning of duration, obtains the scanning information of each channel, and these scanning informations include that AP is at each setting duration
The all detection response messages inside received, and all carry re-transmission message flag position, node identification and
The data message of message transmission rate；Then, according to the detection response message in the scanning information obtained, and
The corresponding probe requests thereby message that AP sends in each setting duration, determines the response time of each channel,
And the response time determined is not more than the channel of setting time as candidate channel；Finally, according to candidate
Re-transmission message flag position, node identification and the message transmissions carried in data message in the scanning information of channel
Speed, calculates the channel quality assessment value of candidate channel, and the channel quality being switched to calculate by self is commented
Valuation is not less than in the candidate channel setting threshold value.The AP of the embodiment of the present invention is by right under promiscuous mode
Different channels (such as current operating channel and inoperative channel) is scanned, and obtains probe requests thereby response message
With other AP on each channel and the more information of terminal so that the channel quality assessment value calculated relatively is as the criterion
Really, improve the accuracy rate of switching.
Accompanying drawing explanation
The flow chart of the wireless channel switching method that Fig. 1 provides for the embodiment of the present invention；
The structural representation of the wireless channel switching device that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, a kind of wireless channel switching method that the embodiment of the present invention is provided and dress
The detailed description of the invention put illustrates.
A kind of wireless channel switching method that the embodiment of the present invention provides, as it is shown in figure 1, specifically include following
Step:
S11:AP successively according to predetermined period under promiscuous mode to current operating channel and preset inoperative
Channel is set the scanning of duration, obtains the scanning information of each channel；
Here, the scanning information of each channel includes all spies that AP receives in each setting duration
Survey response message, and all carrying retransmits message flag position, node identification and the number of message transmission rate
According to message；
S12: according to the detection response message in the scanning information obtained, and from each setting duration
The corresponding probe requests thereby message sent, determines the response time of each channel, and the response time that will determine
It is not more than the channel of setting time as candidate channel；
S13: according to the re-transmission message flag position carried in the data message in the scanning information of candidate channel,
Node identification and message transmission rate, calculate the channel quality assessment value of candidate channel, and self be switched to
The channel quality assessment value calculated is not less than in the candidate channel setting threshold value.
Preferably, in above-mentioned steps S11, above-mentioned predetermined period and setting duration can be according to wireless networks
Practical operation situation determines, such as, in order to avoid predetermined period relatively short-range missile causes AP switching channel more frequency
Numerous, predetermined period may be set to 100ms, sets duration and may be set to 10ms, and certainly, the two can also
It is set as other numerical value.It addition, above-mentioned default inoperative channel can be except AP current operating channel it
Outer whole inoperative channels, it is also possible to be part inoperative channel.
In above-mentioned steps S11, why AP works in when each setting duration interscan respective channels
Promiscuous mode, is primarily due to, and AP can obtain more report in respective settings duration in this mode
Literary composition information, in order to the follow-up channel quality assessment value calculating each channel exactly, improves switching accurately
Rate；After the end of scan, AP can actively be switched to normal mode of operation (i.e. non-motley pattern).
Further, in above-mentioned steps S12, AP can determine each channel especially by following manner
Response time:
AP adds up self respectively on each channel from sending each probe requests thereby message to receiving correspondence
Response time between detection response message；
Respectively the response time counted is averaged computing, obtain the response time of each channel.
Specifically, determine in mode above-mentioned, each probe requests thereby that AP sends in each setting duration
Message, actually AP are from the Beacon judging that purpose AP of each probe requests thereby message is sent
The RSSI value carried in message, not less than when setting numerical value, sends to corresponding purpose AP.
It is to say, for AP, as a example by scanning AP current operating channel, when above-mentioned setting
In long, in order to avoid some AP from farther out and RSSI value is less, cause the sound of the follow-up channel determined
Between Ying Shi longer so that the channel quality assessment value deviation finally calculated is relatively big, and the AP in the present invention is also
It not during this period of time to receive a Beacon message, the mark just carried in this Beacon message
AP corresponding to information (such as bssid) sends probe requests thereby message, but receive this Beacon message it
After, first judge whether the RSSI value carried in this Beacon message meets above-mentioned condition (i.e. RSSI value
Not less than setting numerical value), in the case of meeting condition, then the bssid carried in this Beacon message
Corresponding AP sends probe requests thereby message, to improve switching accuracy rate.
It should be noted that above-mentioned setting numerical value still can determine according to the practical operation situation of wireless network,
The most above-mentioned setting numerical value can be 70, it is of course also possible to be set as other numerical value.
Preferably, in above-mentioned steps S13, AP can be calculated candidate channel especially by following manner
Channel quality assessment value:
According to the re-transmission message flag position carried in the data message in the scanning information of candidate channel, node mark
Know and message transmission rate, calculate the message retransmission rate of candidate channel, terminal number and message transmission rate；
The message retransmission rate calculated, terminal number and message transmission rate are computed weighted, is waited
Select the channel quality assessment value of channel.
Specifically, AP can be calculated the message retransmission rate of candidate channel especially by following manner:
AP adds up respectively and carries re-transmission message flag position in the data message in the scanning information of candidate channel
For setting the message number of flag bit, and the data message sum in the scanning information of candidate channel；
The message number counted and data message sum are carried out ratio computing, obtains the message weight of candidate channel
Biography rate.
In aforesaid way, setting flag bit can set according to the practical situation of wireless network, such as, if
Determining flag bit is 1, represents this message for retransmitting message, it is, of course, also possible to be other setting means, at this
Enumerate the most one by one.
Specifically, AP can be calculated the terminal number of candidate channel by following manner:
The node identification carried in data message in the scanning information of AP statistics candidate channel is terminal iidentification
Number, obtain the terminal number of candidate channel.
In aforesaid way, above-mentioned terminal iidentification still can set according to the practical situation of wireless network, such as,
Terminal iidentification is TODS, and representative is the MAC Address of terminal, it is, of course, also possible to be other setting means,
Enumerate the most one by one at this.
Specifically, AP is calculated the message transmission rate of candidate channel by following manner:
Message transmission rate in data messages all in the scanning information of candidate channel is averaged
Computing, obtains the message transmission rate of candidate channel.
Specifically, AP can pass through formula (A+B+C) × 0.3, is calculated the channel quality assessment of candidate channel
Value.Here, A is the message retransmission rate of candidate channel, and B is the terminal number of candidate channel, and C is for waiting
Select the message transmission rate of channel.
It should be noted that the embodiment of the present invention is not limited in above-mentioned formula calculates channel quality assessment value,
Other formula can also be used to calculate, above-mentioned computing formula is not done any restriction at this.
Further, in above-mentioned steps S13, after calculating channel quality assessment value, if met
The channel quality assessment value of above-mentioned condition has multiple, and in this case, AP can be switched to meet above-mentioned
On arbitrary channel that the channel quality assessment value of condition is corresponding.
As a example by an AP in WLAN, it is assumed that it is currently operating in 1 channel, default inoperative letter
Road is 6 and 11 channels, and predetermined period is 100ms, and the time that sets is as 10ms, then, above-mentioned in execution
During method, when certain 100ms arrives, AP starts to carry out 1 channel the scanning of 10ms, thus obtains
Relevant scanning information to 1 channel；Then proceed to work to this cycle remaining 90ms, next
100ms arrive time, it is assumed that AP is switched on 6 channels, start for time 10ms scanning, obtain 6 letters
The relevant scanning information in road, is switched on 1 channel this cycle remaining 90ms that works on after the end of scan,
When follow-up 100ms arrives again, AP is switched on 11 channels, start for time 10ms scanning,
Obtain the relevant scanning information of 11 channels, again switch to after the end of scan work on 1 channel.
Further, AP, after the relevant scanning information obtaining these channels, performs above-mentioned steps S12-13,
Assume that the follow-up channel quality assessment value determining 1 channel is unsatisfactory for above-mentioned condition, and 6 and 11 channels
Channel quality assessment value is satisfied by above-mentioned condition, and in this case, AP can be switched to 6 channels, also
11 channels can be switched to.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of wireless channel switching device, due to
The principle of the solved problem of this device is similar to aforementioned wireless channel switching method, and therefore the enforcement of this device can
To see the enforcement of preceding method, repeat no more in place of repetition.
The wireless channel switching device that the embodiment of the present invention provides, as in figure 2 it is shown, specifically include:
Scan module 21, for successively according to predetermined period under promiscuous mode to current operating channel and preset
Inoperative channel be set the scanning of duration, obtain the scanning information of each channel；
Here, the scanning information of each channel includes all spies that AP receives in each setting duration
Survey response message, and all carrying retransmits message flag position, node identification and the number of message transmission rate
According to message；
Determine module 22, the detection response message in the scanning information that basis obtains, and device is each
The corresponding probe requests thereby message sent in setting duration, determines the response time of each channel, and will determine
Response time be not more than the channel of setting time as candidate channel；
Computing module 23, for according to the re-transmission report carried in the data message in the scanning information of candidate channel
Literary composition flag bit, node identification and message transmission rate, calculate the channel quality assessment value of candidate channel；
Handover module 24, for switching the device into the channel quality assessment value calculated not less than setting threshold value
Candidate channel on.
Preferably, above-mentioned determine module 22, every from sending on each channel specifically for adding up self respectively
Individual probe requests thereby message is to the response time received between corresponding detection response message；And respectively to statistics
The response time gone out is carried out averaging computing, obtains the response time of each channel.
Preferably, above-mentioned determine when module 22 calculates the response time of each channel that each detection of foundation please
Seek message, take in the Beacon message that purpose AP judging each probe requests thereby message is sent for device
The RSSI value of band, not less than when setting numerical value, sends to corresponding purpose AP.
Preferably, above-mentioned computing module 23, specifically for according to the datagram in the scanning information of candidate channel
Re-transmission message flag position, node identification and the message transmission rate carried in literary composition, calculates the message of candidate channel
Retransmission rate, terminal number and message transmission rate；And to the message retransmission rate calculated, terminal number and
Message transmission rate computes weighted, and obtains the channel quality assessment value of candidate channel.
Preferably, above-mentioned computing module 23, specifically for adding up the number in the scanning information of candidate channel respectively
The message number that message flag position is setting flag bit is retransmitted according to message carries, and the scanning of candidate channel
Data message sum in information, and the message number counted and data message sum are carried out ratio computing,
Obtain the message retransmission rate of candidate channel；Data message in the scanning information of statistics candidate channel carries
Node identification is the number of terminal iidentification, obtains the terminal number of candidate channel；And sweeping candidate channel
The message transmission rate retouched in information in all data messages is carried out averaging computing, obtains candidate channel
Message transmission rate.
Preferably, above-mentioned computing module 23, specifically for by formula (A+B+C) × 0.3, being calculated time
Selecting the channel quality assessment value of channel, wherein, A is the message retransmission rate of candidate channel, and B is candidate channel
Terminal number, C is the message transmission rate of candidate channel.
The AP of the embodiment of the present invention by under promiscuous mode to different channels (such as current operating channel and
Inoperative channel) it is scanned, on acquisition probe requests thereby response message and each channel, other AP and terminal are more
Multi information so that the channel quality assessment value calculated is more accurate, improves the accuracy rate of switching.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a wireless channel switching method, it is characterised in that including:
AP successively according to predetermined period under promiscuous mode to current operating channel and preset inoperative channel
Being set the scanning of duration, obtain the scanning information of each channel, the scanning information of each channel includes described
All detection response messages that AP receives in each setting duration, and all carry re-transmission message mark
The data message of will position, node identification and message transmission rate；
According to the detection response message in the scanning information of each channel obtained, with from during in each setting
The corresponding probe requests thereby message sent in long, determines the response time of each channel, and the response that will determine
Time is not more than the channel of setting time as candidate channel；
The re-transmission message flag position carried in the data message in scanning information according to described candidate channel, joint
Point identification and message transmission rate, calculate the channel quality assessment value of described candidate channel, and self switched
To the channel quality assessment value calculated not less than in the candidate channel setting threshold value；
Wherein, described AP is calculated the channel quality assessment value of described candidate channel by following manner:
The re-transmission message flag position carried in the data message in scanning information according to described candidate channel, joint
Point identification and message transmission rate, calculate the message retransmission rate of described candidate channel, terminal number and message and pass
Defeated speed；
The message retransmission rate calculated, terminal number and message transmission rate are computed weighted, obtains institute
State the channel quality assessment value of candidate channel.
2. the method for claim 1, it is characterised in that described AP is determined by following manner
The response time of each channel:
Described AP adds up self respectively on each channel from sending each probe requests thereby message to receiving
Response time between corresponding detection response message；
Respectively the response time counted is averaged computing, obtain the response time of each channel.
3. method as claimed in claim 2, it is characterised in that described each probe requests thereby message, for
Described AP is in the beacon Beacon message that purpose AP judging described each probe requests thereby message is sent
The received signal strength RSSI value carried, not less than when setting numerical value, sends to corresponding purpose AP.
4. the method for claim 1, it is characterised in that described AP is calculated by following manner
Message retransmission rate to described candidate channel:
Described AP adds up respectively and carries re-transmission report in the data message in the scanning information of described candidate channel
Literary composition flag bit is the message number setting flag bit, and the data message in the scanning information of described candidate channel
Sum；
The message number counted and data message sum are carried out ratio computing, obtains the report of described candidate channel
Literary composition retransmission rate；
Described AP is calculated the terminal number of described candidate channel by following manner:
Described AP adds up the node identification carried in the data message in the scanning information of described candidate channel
The number of terminal iidentification, obtains the terminal number of described candidate channel；
Described AP is calculated the message transmission rate of described candidate channel by following manner:
Carry out asking flat by the message transmission rate in data messages all in the scanning information of described candidate channel
Mean operation, obtains the message transmission rate of described candidate channel.
5. a wireless channel switching device, it is characterised in that including:
Scan module, for successively according to predetermined period under promiscuous mode to current operating channel and preset
Inoperative channel is set the scanning of duration, obtains the scanning information of each channel, the scanning letter of each channel
Breath includes all detection response messages that AP receives in each setting duration, and all carries weight
Pass message flag position, node identification and the data message of message transmission rate；
Determine module, the detection response message in the scanning information according to each channel obtained, and institute
State the corresponding probe requests thereby message that AP sends in each setting duration, determine the response time of each channel,
And the response time determined is not more than the channel of setting time as candidate channel；
Computing module, for according to the re-transmission carried in the data message in the scanning information of described candidate channel
Message flag position, node identification and message transmission rate, calculate the channel quality assessment value of described candidate channel；
Handover module, the channel quality assessment value for described device is switched to calculate is not less than setting threshold
In the candidate channel of value；
Wherein, described computing module, specifically for the datagram in the scanning information according to described candidate channel
Re-transmission message flag position, node identification and the message transmission rate carried in literary composition, calculates described candidate channel
Message retransmission rate, terminal number and message transmission rate；And to the message retransmission rate calculated, terminal
Number and message transmission rate compute weighted, and obtain the channel quality assessment value of described candidate channel.
6. device as claimed in claim 5, it is characterised in that described determine module, specifically for point
Do not add up self on each channel from sending each probe requests thereby message to receiving corresponding probe response report
Response time between literary composition；And computing of respectively response time counted being averaged, obtain every
The response time of individual channel.
7. device as claimed in claim 6, it is characterised in that described determine that module calculates each channel
Response time time foundation each probe requests thereby message, for described device judging described each detection please
Ask the received signal strength RSSI value carried in the beacon Beacon message that purpose AP of message sends little
In time setting numerical value, send to corresponding purpose AP.
8. device as claimed in claim 5, it is characterised in that described computing module, specifically for dividing
Do not add up and the data message in the scanning information of described candidate channel carries re-transmission message flag position for setting
Determine the message number of flag bit, and the data message sum in the scanning information of described candidate channel, and will system
The message number counted out and data message sum carry out ratio computing, obtain the message retransmission of described candidate channel
Rate；Adding up the node identification carried in the data message in the scanning information of described candidate channel is terminal iidentification
Number, obtain the terminal number of described candidate channel；And by institute in the scanning information of described candidate channel
Having the message transmission rate in data message to carry out averaging computing, the message obtaining described candidate channel passes
Defeated speed.
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| CN111163497B (en) * | 2019-12-19 | 2022-08-16 | 展讯通信（上海）有限公司 | Communication device, system and channel switching method |
| CN111031583A (en) * | 2019-12-19 | 2020-04-17 | 杭州迪普科技股份有限公司 | Channel switching method and device |
| CN111465084B (en) * | 2020-06-01 | 2022-06-03 | 杭州鸿雁智能科技有限公司 | Access method and device of equipment, storage medium and processor |
| CN115243333A (en) * | 2021-04-23 | 2022-10-25 | 华为技术有限公司 | Communication method and AP |
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