CN103686869B - bandwidth selection method - Google Patents
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- CN103686869B CN103686869B CN201210347085.1A CN201210347085A CN103686869B CN 103686869 B CN103686869 B CN 103686869B CN 201210347085 A CN201210347085 A CN 201210347085A CN 103686869 B CN103686869 B CN 103686869B
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Abstract
The invention discloses a kind of bandwidth selection method, comprising at least one first quality information for extracting the first frequency range of correspondence, at least one first threshold value is calculated according at least one first quality information and at least one first Weighted Index, extract at least one second quality information of the second frequency range of correspondence, relatively at least one first threshold value and at least one second quality information obtaining the first comparative result, and according to the first comparative result select in the first frequency range and the second frequency range one for wave filter use frequency range.The bandwidth selection method of the present invention determines the use frequency range of wave filter based on the quality information of the signal of each frequency range, with dynamic select using frequency range reducing the impact caused by ambient noise interference, and then effectively lifts transmission quality and transmission efficiency.
Description
Technical field
The present invention is related to a kind of Radio Transmission Technology, and especially with regard to a kind of bandwidth selection method.
Background technology
As Radio Transmission Technology is widely applied, signal miscellaneous in air, is there is, can be to being wirelessly transferred
Interference is produced, therefore general wireless router or base station can be set in one and disturb less transmission channel.However, environment
It is to change always, therefore in wireless transmitting system, there are the needs of many frequency range operations.
In wireless transmitting system, the maximum allowed in operating specification is selected generally for more preferable handling capacity is obtained
Frequency range is to use frequency range.But, larger use frequency range is subject to the possibility of narrow frequency interference also larger.When the energy of interference signal
When enough big, interference signal can be considered as normal package and be received by receiving terminal, but because wireless transmitting system correctly can not be demodulated
It is judged to false alarm（false alarm）.Normally cannot receive during judging interference signal for false alarm due to receiving terminal
Package, thus resulting in the normal package needed for wireless transmitting system needs to retransmit, and then reduces transfer rate.It is in this, wireless to pass
The transmission quality of defeated system is affected.
Wherein, the package of normal package and interference signal needed for cannot efficiently separating because of wireless transmitting system, and lead
Causing wireless transmitting system to be possible to when being demodulated can be because signal-to-noise ratio（SIR）Too low and demodulation result mistake.In this, can
Increasing through-put power increases signal-to-noise ratio, and increases the correctness of receiving terminal demodulation.However, large transmission power still needs to consider
Cost and benefit.
Additionally, in the transmission environment of the wireless router of wireless transmitting system or base station in changing, therefore can often be subject to
Noise that other communication systems or some electrical equipment are sent is disturbed and reduces transmission quality.So, how to avoid noise and do
Impact caused by disturbing is one of main research and development of Radio Transmission Technology.
The content of the invention
To solve the problems referred to above of the prior art, the invention provides a kind of bandwidth selection method.
In certain embodiments, a kind of bandwidth selection method includes the first quality information for extracting the first frequency range of correspondence, root
The second quality information of corresponding second frequency range of the first threshold value, extraction is calculated according to the first quality information and the first Weighted Index, than
Compared with the first threshold value and the second quality information obtaining the first comparative result, and the first frequency range is selected according to the first comparative result
With the use frequency range that in the second frequency range is wave filter.
In certain embodiments, a kind of bandwidth selection method is included and is extracted corresponding to one of different two frequency range at least
One first quality information and compare one first quality information and a predetermined threshold value.
When the first quality information is more than predetermined threshold value, an interference detecting is performed.Conversely, when the first quality information is little
When predetermined threshold value, then following step is performed.Select the greater in described two frequency ranges as wave filter use frequency range,
Read out at least one absolute threshold value, extract the 3rd quality information, the absolute threshold value of comparison and three qualities that correspondence uses frequency range
Information is obtaining the second comparative result and selectively perform interference detecting according to the second comparative result.
Wherein, detecting is disturbed to include obtaining the first threshold value, extracting institute according to the first quality information and the first Weighted Index
State the second quality information corresponding to the other of two frequency ranges, compare the first threshold value and the second quality information to obtain the
One comparative result and the frequency range in described two frequency ranges is selected to be a wave filter using frequency according to the first comparative result
It is wide.
In sum, the quality information of bandwidth selection method according to embodiments of the present invention based on the signal of each frequency range come
The use frequency range of wave filter is determined, with dynamic select using frequency range reducing the impact caused by ambient noise interference, Jin Eryou
Effect ground lifts transmission quality and transmission efficiency.
Description of the drawings
Fig. 1 is the schematic diagram of the wireless transmitting system of an embodiment.
Fig. 2 is the flow chart of bandwidth selection method according to a first embodiment of the present invention.
Fig. 3 is the flow chart of bandwidth selection method according to a second embodiment of the present invention.
Fig. 4 is the thin portion flow chart of the interference detecting of first embodiment in Fig. 3.
Fig. 5 is the thin portion flow chart of the interference detecting of second embodiment in Fig. 3.
Fig. 6 is the flow chart of bandwidth selection method according to a third embodiment of the present invention.
Fig. 7 is the local flow chart of bandwidth selection method according to a fourth embodiment of the present invention.
Fig. 8 A and Fig. 8 B are the local flow charts of bandwidth selection method according to a fifth embodiment of the present invention.
Fig. 9 is the flow chart of the extracting method of the first quality information of an embodiment.
Figure 10 is the flow chart of the extracting method of the second quality information of an embodiment.
Wherein, description of reference numerals is as follows：
100：Wireless transmitting system
110：Antenna
130：Wireless transmitter
150：Wave filter
170：Frequency range selecting device
190：Storage element
Specific embodiment
Bandwidth selection method proposed by the invention can be applicable to a wireless transmitting system.Fig. 1 is the wireless of an embodiment
The schematic diagram of Transmission system.With reference to Fig. 1, wireless transmitting system 100 includes antenna 110, wireless transmitter 130, wave filter
150th, frequency range selecting device 170 and storage element 190.During wireless receiving and dispatching, wireless transmitter 130 is via antenna 110
Receiving and transmitting signal, and the signal that wireless transmitter 130 is received is filtered via a wave filter 150.Frequency range selecting device 170 is according to frequency
Wide system of selection determines the use frequency range of wave filter 150, and correspondence output control signal causes wave filter 150 to wave filter 150
Carry out the switching using frequency range.
In certain embodiments, frequency range selecting device 170 can be realized by one or more processors.Wave filter 150 can be propped up
Help two kinds of frequency ranges（For convenience of description, referred to as the first frequency range and the second frequency range individually below）.Wherein, the first frequency range is different from the
Two frequency ranges.Storage element 190 then can be realized by one or more storage elements, and the species of the storage element for being used（Example
Such as：Volatibility is non-volatile）Can determine according to the type of stored data.
In certain embodiments, bandwidth selection method of the invention can be realized in the way of software or firmware.
Fig. 2 is the flow chart of the bandwidth selection method according to first embodiment of the invention.
With reference to Fig. 2, wave filter 150 first will switch to first using frequency range according to the control signal of frequency range selecting device 170
Frequency range, and extract at least one first quality information of the first frequency range of correspondence（Step 210）.Also, frequency range selecting device 170 from
Corresponding first Weighted Index of each first quality information is read out in storage element 190, and according to the first corresponding quality
Information and the first Weighted Index calculate the first threshold value of each the first quality information of correspondence（Step 230）.
Wave filter 150 will switch to the second frequency range using frequency range according to the control signal of frequency range selecting device 170 again, and
Extract the second quality information of the second frequency range of correspondence（Step 250）.In this, the species of the second quality information can correspond to the first product
The species of matter information, therefore the second quality information can also correspond respectively to the first threshold value.
Then, to compare each first threshold value corresponding to obtain with corresponding second quality information for frequency range selecting device 170
The first comparative result（Step 270）.Then, one of the first frequency range and the second frequency range is selected to make according to the first comparative result
For the use frequency range of wave filter 150（Step 290）.
In this embodiment, although illustrated with a flow process, but actually can be by execution step repeatedly
210th, step 230, step 250, step 270 and step 290, or with the current use frequency range of wave filter 150（It is considered as the first frequency
It is wide）Extract at least one first quality information and repeatedly execution step 230, step 250, step 270 and step 290 reaching dynamic
Selection uses frequency range, to reduce the impact caused by ambient noise interference, and then effectively lifts transmission quality and transmission efficiency.
In other words, in certain embodiments, wireless transmitting system 100 can be set to the first frequency range and the second frequency range to float
Value.For example, the first frequency range is may be set in two use frequency ranges that frequency range median filter 150 can be used current, and second
Frequency range be then set as two can use frequency range in another frequency range.In further embodiments, wireless transmitting system 100 is also by
One frequency range and the second frequency range are set as fixed frequency range value.
Wherein, the first quality information is the false alarm number of the first frequency range of correspondence（false alarm；FA）, correspondence first
Receive the package number, the headroom channel of the first frequency range of correspondence of frequency range indicates number（CCA）Or its combination, and at least one second quality
Information is the headroom frequency for receiving the second frequency range of package number and correspondence of the false alarm number of the second frequency range of correspondence, the second frequency range of correspondence
Road indicates at least one of number.Also, different types of first quality information can be set with each self-corresponding first weighting
Index.In certain embodiments, can be by assessing whether transmission environment totally determines the selection mode using frequency range.
Fig. 3 is the flow chart of the bandwidth selection method according to second embodiment of the invention.With reference to Fig. 3, compare the first quality
Whether information is less than predetermined threshold（Step 220）.Wherein, predetermined threshold is stored in storage element 190 for setting
One fixed value.
When the first quality information is more than predetermined threshold, transmission environment is judged as unclean（Step 222）, and it is dry to perform one
Disturb detecting.Wherein, in interference detecting, step 230, step 250, step 270 and step 290 are can perform, as shown in Figure 4.
In interference detecting, step 210, and continue execution step 230, step 250, step 270 and step 290 can be also re-executed,
As shown in Figure 5.
When the first quality information is not more than predetermined threshold, transmission environment is judged as clean（Step 223）.In transmission ring
When border is clean, the first frequency range and the greater in the second frequency range are selected as the use frequency range of wave filter 150（Step 300）,
And perform transmission environment monitoring to detect whether interference occurs（That is, confirm whether transmission environment changes into sordid shape
State）.In transmission environment monitoring, frequency range selecting device 170 reads out at least one absolute threshold value from storage element 190（Step
Rapid 310）, and at least one threeth quality information of the correspondence using frequency range is extracted by wave filter 150（Step 330）.In this, the
Three quality informations correspond respectively to absolute threshold value.Frequency range selecting device 170 compares each absolute threshold value and the corresponding 3rd
Quality information is obtaining the second comparative result（Step 350）.Then, frequency range selecting device 170 is determined according to the second comparative result
Whether execution interference is detected（Step 370）, i.e., whether it is more than corresponding absolute threshold value to determine to be according to the 3rd quality information
It is no to perform interference detecting.In this, the 3rd quality information compared with absolute threshold value can be FA, CCA or its combination.
In certain embodiments, when any one of the 3rd quality information is more than corresponding absolute threshold value, frequency range choosing
Select device 170 to perform interference detecting to reselect the use frequency range of wave filter 150.Now, the execution of interference detecting can be to hold
Row step 210, step 230, step 250, step 270 and step 290, as shown in Figure 5.Furthermore, disturb the execution of detecting also may be used
It is that the first frequency range is considered as with the current use frequency range of wave filter 150（3rd quality information can be used as the first quality information）, so
After continue execution step 230, step 250, step 270 and step 290, as shown in Figure 4.
Whether there is certain information content on the use frequency range of predetermined threshold assessment wave filter 150.In this, transmission environment is
Totally do not represent that there is certain information content, and transmission environment totally to represent do not have on using frequency range on using frequency range
There is certain information content.Therefore, to judge that the first quality information of the state of transmission environment can be the reception of the first frequency range of correspondence
Package number.
Furthermore, each absolute threshold value can be the fixed value in setting storage storage element 190.In some embodiments
In, absolute threshold value can be for the false alarm number corresponding to the greater in the first frequency range and the second frequency range, receive package
Number, headroom channel indicate the set threshold values of number or its combination.
And when not having the 3rd quality information to be more than corresponding absolute threshold value, after a given time, return to step
330, re-execute step 330 and the execution subsequent step that continues.Wherein, this given time can be the several seconds, for example：Within 30 seconds.
In this, by taking the wireless telecommunication system 100 of the mechanics of communication based on IEEE802.11n as an example, wave filter 150 can be used
Frequency range be 20MHz and 40MHz respectively.Wherein, the frequency range of 40MHz is the secondary channel of main thoroughfare by 20MHz and 20MHz
Constituted.
Assume that the first frequency range is 20MHz, and the second frequency range is 40MHz, but the present invention is not limited to this.With reference to Fig. 6, frequency range
The use frequency range of wave filter 150 is first controlled to 20MHz by selecting device 170, and extracts the first quality information for corresponding to 20MHz,
By FA, as a example by receiving package number and CCA（Step 212）.By the FA of the corresponding 20MHz for extracting, receive package number and CCA difference
Each self-corresponding first Weighted Index is multiplied by, with three the first threshold values for being corresponded to FA respectively, receiving package number and CCA
（Step 232）.
For example, first threshold value of correspondence FA can be obtained after the FA of correspondence 20MHz being weighted 1.5 times；Will correspondence
Receiving after package number weights 1.5 times for 20MHz can obtain the first threshold value that correspondence receives package number；By the CCA of correspondence 20MHz
First threshold value of correspondence CCA can be obtained after 1.5 times of weighting, but the invention is not restricted to this.Furthermore, although example explanation is not of the same race
First Weighted Index of class is set to identical value, but the invention is not restricted to this, can be according to actual demand by different types of
One Weighted Index is set as different value.
Frequency range selecting device 170 controls wave filter 150 again and will switch to 40MHz using frequency range, and extracts correspondence 40MHz's
FA, reception package number and CCA, i.e. the second quality information（Step 252）.
Then, each second quality information is compared with each self-corresponding first threshold value（Step 272）.Namely
Say, relatively the FA of correspondence 40MHz is sealed with the reception of the first threshold value, the corresponding 40MHz of comparison calculated by the FA of corresponding 20MHz
Bag number with by corresponding 20MHz receive the first threshold value for calculating of package number and the relatively CCA of correspondence 40MHz with by right
The first threshold value for answering the CCA of 20MHz to calculate.
When arbitrary second quality information is more than the first corresponding threshold value（Step 274）When, judge that 40MHz's uses frequency
Road is to be interfered, for example：Affected by adjacent channel or other wireless telecommunication systems etc..Now, frequency range selecting device 170 is selected
20MHz is selected as the use frequency range of wave filter 150（Step 292）, and send corresponding control signal to control wave filter 150
20MHz will be switched to using frequency range.
When the second quality information of nothing is more than the first corresponding threshold value（Step 274）When, then judge that 40MHz's uses frequency
Road is not affected by interference.Now, frequency range selecting device 170 selects 40MHz as the use frequency range of wave filter 150（Step 294）, and
And send corresponding control signal and will remain 40MHz using frequency range to control wave filter 150.
In this, although illustrate with 20MHz as the first frequency range and by the second frequency range of 40MHz, but the present invention is not limited
In this, also can be set as that the first frequency range is 40MHz according to being actually needed, and the second frequency range is 20MHz, or be set to filter
The current use frequency range of device 150 is the first frequency range, and another frequency range is the second frequency range.
In certain embodiments, it is assumed that the first frequency range is 40MHz, and the second frequency range is 20MHz.Now, then it is with correspondence
The FA of 40MHz, receive package number and CCA（That is the first quality information）It is multiplied by each self-corresponding first Weighted Index to obtain correspondence
First threshold value of FA, correspondence receive first threshold value of the first threshold value of package number and correspondence CCA.Now, the first weighting
Index may be less than 1, and be more than 0.
Also, the relatively FA of correspondence 20MHz（That is the second quality information）It is corresponding with first threshold value of corresponding FA, comparison
The reception package number of 20MHz（That is the second quality information）With corresponding the first threshold value for receiving package number and comparison correspondence
The CCA of 20MHz（That is the second quality information）With first threshold value of corresponding CCA.
Similarly, when arbitrary second quality information is more than the first corresponding threshold value, judge the use channel of 40MHz
It is to be interfered, and frequency range selecting device 170 then selects 20MHz as the use frequency range of wave filter 150.When without the second quality letter
When breath is more than the first corresponding threshold value, then judge that the use channel of 40MHz is not affected by disturbing, and frequency range selecting device 170
40MHz is selected as the use frequency range of wave filter 150.
In certain embodiments, the first quality for using can be also determined according to the transmission state of wireless telecommunication system 100
The value of the type and quantity and the first Weighted Index of information and the second quality information.
With reference to Fig. 7, before the first quality information and the second quality information is extracted, first detecting wireless communication system 100
Transmission state（Step 201）, to judge whether transmission state is busy（Step 203）.In this, can be by the number of detecting wireless transmission
It is whether busy to learn wireless telecommunication system 100 according to measuring.For example, when the data volume being wirelessly transferred is more than a predetermined amount,
Wireless telecommunication system 100 is busy condition；Conversely, when the data volume being wirelessly transferred is not more than this predetermined amount, wireless telecommunications system
System 100 is idle condition
When the transmission state of wireless telecommunication system 100 is busy condition（Step 205）When, set the first quality letter for extracting
The FA for the first frequency range of correspondence is ceased, and sets the FA of the second quality information of extraction as the second frequency range of correspondence（Step 207）.And
And, setting is using the first little Weighted Index of relative free state（Step 207）.
When the transmission state of wireless telecommunication system 100 is idle condition（Step 206）When, set the first quality letter for extracting
Cease the FA for the first frequency range of correspondence, receive package number, CCA or its combination, and set the second quality information for extracting as corresponding the
The FA of two frequency ranges, receive package number, CCA or its combination（Step 209）.Also, set use relative busy condition big first
Weighted Index（Step 209）.In this, first quality information and the second quality information of extraction can preferably be FA, reception package number
And CCA.
For example, when wireless telecommunication system 100 is busy condition, the first Weighted Index can be 1.5 times；Work as channel radio
When news system 100 is idle condition, the first Weighted Index can be 2.5 times.
In certain embodiments, each first quality information includes the signal quality information of respective center passage and multiple neighbouring
The signal quality information of passage, and central passage is continuously to sort and be respectively provided with identical frequency range with adjacent channel.Each second quality
Information includes the signal quality information of the signal quality information of respective center passage and multiple adjacent channels, and central passage and neighbour
Nearly passage is continuously to sort and be respectively provided with identical frequency range.Wherein, central passage is in 100 service bands of wireless telecommunication system
The passage that frequency of heart is located.The frequency band of adjacent channel and the band overlapping of central passage.
In this, the communications protocol supported by wireless telecommunication system 100 can be bluetooth（BlueTooth）、IEEE802.11a/
B/g/n, family expenses high frequency are wirelessly transferred（Home RF）Standard, radio area network road technique（HiperLan2）, or infrared ray
（Infrared）Technology etc..
By taking IEEE802.11n wireless telecommunication systems 100 as an example, in the ISM band of 2.4GHz, wireless telecommunication system 100
Working frequency range be 2412-2472MHz, a total of 13 passages, and these passages sequentially sort with the interval of 5MHz.Its
In, when the centre frequency of service band is 2437MHz, under the frequency range pattern of 20MHz, central passage is Ch6, and frequency band is
2427MHz to 2447MHz.The adjacent channel of an adjacent channel（Ch7）Centre frequency be 2442MHz, and frequency band be 2432MHz
To 2452MHz.It is to overlap that both frequency bands have 15MHz.The rest may be inferred, when wireless telecommunication system 100 is using the 20MHz of Ch6
Frequency range pattern when, Ch2 to Ch5 and Ch7 to Ch10 is can the adjacent channel Chong Die with Ch6.In the frequency range pattern of 40MHz
Under, then represent that this be by the passage of the frequency range pattern of two 20MHzs for Ch6 using passage（Ch6 and Ch10）Constituted, i.e. frequency band
For 2427MHz to 2467MHz.Now, central passage is Ch8, and the adjacent channel Chong Die with central passage then has Ch3 extremely
Ch5 and Ch7 to Ch13.
For convenience of description, below with using passage as Ch1, the first frequency range as 20MHz, and the second frequency range be 40MHz as a example by.
Under the frequency range pattern of 40MHz, the use of the frequency band of passage can be by main thoroughfare（Ch1 under the frequency range pattern of 20MHz）With
And secondary channel（Ch5 under the frequency range pattern of 20MHz）Combine.Under the frequency range pattern of 40MHz, service band is
2402MHz to 2442MHz, and centre frequency is position in Ch3.For the first frequency range, central passage is Ch1, and Ch2, Ch3
All there is the adjacent channel of overlap with Ch4 at last.For the second frequency range, central passage is Ch3, and Ch1, Ch2, Ch4, Ch6,
Ch7 and Ch8 have the adjacent channel of overlap at last.
With reference to following table one, when to receive package number to calculate the first quality information and the second quality information, correspondence 20MHz
The first quality information be the summation of the reception package number extracted in Ch1, Ch2, Ch3 and Ch4, and correspondence 40MHz
Second quality information is the summation of the reception package number extracted in Ch1, Ch2, Ch3, Ch4, Ch5, Ch6, Ch7 and Ch8.
In this, it is assumed that the first Weighted Index is set to 1.5, then the first threshold value can be calculated for 51 by the first quality information.Also,
After obtain the second quality information more than the first threshold value（220>51）, thus select 20MHz to be to use frequency range.
Table one
In certain embodiments, neighbour can be given according to each adjacent channel and the band overlapping size of central passage, correspondence
The different weighted value of the signal quality information of nearly passage.For example：Less with central passage overlapping bands, the weighted value for being given is then
It is less；Conversely, bigger with central passage overlapping bands, the weighted value for being given is then bigger.Wherein, each weighted value be less than or wait
Multiple in 1 and more than 0.
In other words, each first quality information includes the signal quality information of a corresponding central passage and has each weighting
The signal quality information of multiple adjacent channels of value, and central passage is continuously to sort and be respectively provided with same frequency with adjacent channel
It is wide.Each second quality information includes the signal quality information of respective center passage and the multiple adjacent channels with respective weighted value
Signal quality information, and central passage and adjacent channel are continuously to sort and be respectively provided with identical frequency range.
Wherein, passage of the central passage for the centre frequency place of 100 service bands of wireless telecommunication system.Adjacent channel
It can be the passage with the band overlapping of central passage.Additionally, within adjacent channel is alternatively specific quantity adjacent with central passage
Passage, imply that and be connected at certain amount of passage before and after central passage.For example, it is connected at spy before and after central passage
Front 1 passage and rear 1 passage of the passage of fixed number amount such as central passage, or front 2 passages of central passage and latter 2
Passage.
For example, with reference to table two, it is assumed that the weighted value of an adjacent passage is 0.8（W1）, two neighboring passage plus
Weights are 0.6（W2）, and the weighted value of adjacent more than three is 0.4（W3）.For first frequency range of 20MHz, neighbouring logical
Road（Ch2, Ch3 and Ch4）Extracted reception package number is first multiplied with respective weighted value, afterwards again with central passage（Ch1）
Extracted reception package number is added up together, and obtains the first quality information for 23.6.
Similarly, for second frequency range of 40MHz, in adjacent channel（Ch1, Ch2, Ch4, Ch5, Ch6, Ch7 and Ch8）
The reception package number that extracted first is multiplied with respective weighted value, afterwards again with central passage（Ch3）It is extracted to receive envelope
Bag number is added up together, and obtains the second quality information for 102.2.In this, it is assumed that the first Weighted Index is set to 1.5, then
First threshold value can be calculated for 35.4 by the first quality information.As the second quality information is more than the first threshold value, so choosing
20MHz is selected as using frequency range.
Table two
In certain embodiments, select interference detecting can be being re-executed after setting time using after frequency range, to supervise
The change disturbed in control transmission environment.Wherein, setting time can be the time threshold being stored in storage element 190.
Reference picture 8A, is selecting to use frequency range（Step 290, step 292 or step 294）Afterwards, one cumulative time of timing（Step
Rapid 410）, and judge whether the cumulative time reaches time threshold（Step 430）.
When step 430 judges that the cumulative time reaches time threshold, interference detecting is re-executed.In this, the weight of detecting is disturbed
New execution can be to be considered as the first frequency range with the current use frequency range of wave filter 150（3rd quality information can be used as the first quality
Information）And continue execution step 230, step 250, step 270 and step 290.Furthermore, what interference was detected re-executes alternatively
Re-execute step 210, step 230, step 250, step 270 and step 290.
Also, after interference detecting is re-executed, confirm whether the use frequency range of selection is same as previous selection knot
Really（Step 450）.In other words, after interference detecting is re-executed, can confirm whether wave filter 150 carries out cutting using frequency range
Change.
When the use frequency range for selecting is same as previous selection result（Step 450）, imply that wave filter 150 does not enter to exercise
With the switching of frequency range, increase the value of time threshold（Step 470）.In some embodiments, time threshold can be increased with an arithmetic series
Plus its value, or its value is increased with geometric progression.Also, this geometric progression can be ascending.
When step 430 judges that the cumulative time does not reach time threshold, quality detecting is performed, monitored using frequency range at any time
Whether signal quality changes.
Reference picture 8B, in quality detecting, obtains at least one the 3rd threshold value（Step 510）Also, pass through wave filter 150
Extract at least one threeth quality information of the correspondence using frequency range（Step 530）.In this, the 3rd quality information corresponds respectively to the 3rd
Threshold value.
3rd threshold value can select to use frequency range（Step 290, step 292 or step 294）Afterwards, immediately according to selection
Quality information and the second Weighted Index corresponding to frequency range is calculating, and the 3rd threshold value for calculating is stored in storage element
In 190.In step 510, frequency range selecting device 170 reads out the 3rd threshold value of storage again from storage element 190.
For example, when being to select the first frequency range as using frequency range in step 290, step 292 or step 294,
For the species of quality information, the second the first quality information of each species corresponding Weighted Index is multiplied to obtain each
Plant the 3rd threshold value of quality information.When in step 290, step 292 or step 294 be select the second frequency range as use frequency
When wide, then it is multiplied to obtain various quality letters by the second corresponding Weighted Index of the second quality information by each species
3rd threshold value of breath.
Frequency range selecting device 170 compares each the 3rd threshold value and compares knot to obtain the 3rd with corresponding 3rd quality information
Really（Step 550）.Then, decide whether to perform interference detecting according to the 3rd comparative result（Step 570）.
Wherein, when the use frequency range selected in step 290, step 292 or step 294 is relatively small frequency range（Example
Such as：20MHz in 20MHz and 40MHz）When, the second Weighted Index is that, less than 1, and step 550 is to judge that the 3rd quality information is
It is no to disturb detecting to decide whether to perform less than corresponding 3rd threshold value.In other words, when any one the 3rd quality information is less than
During corresponding three threshold value, interference detecting is re-executed.Conversely, work as not having the 3rd quality information to be less than corresponding 3rd thresholding
During value, then step 410 is returned to.
When the use frequency range selected in step 290, step 292 or step 294 is relatively large frequency range（For example：
40MHz in 20MHz and 40MHz）When, the second Weighted Index is that, more than 1, and step 550 is whether to judge the 3rd quality information
Decide whether to perform interference detecting more than corresponding 3rd threshold value.In other words, when any one the 3rd quality information is more than right
During three threshold value answered, interference detecting is re-executed.Conversely, work as not having the 3rd quality information to be more than corresponding 3rd threshold value
When, then return to step 410.
Also, the 3rd quality information compared with the 3rd threshold value can be FA, CCA, reception package number or its combination.
In certain embodiments, step 210, step 212, step 250, step 252 and step 330 can be by analyses in filter
Ripple device 150 it is current using crossfire signal received under frequency range obtaining corresponding quality information.
Fig. 9 is referred to, and by taking the first quality information as an example, first, the use frequency range of wave filter 150 is set as the first frequency range
（Step 213）, wave filter 150 is caused using the first frequency range as current use frequency range.Wireless transmitter 130 is via antenna
The 110 one first crossfire signals for receiving corresponding first frequency range（Step 215）.Frequency range selecting device 170 is by analyzing the first crossfire
Signal obtains the first quality information（Step 217）.
Figure 10 is referred to, and by taking the second quality information as an example, first, the use frequency range of wave filter 150 is set as the second frequency range
（Step 253）, wave filter 150 is caused using the second frequency range as current use frequency range.Then, wireless transmitter 130 via
Antenna 110 receives one second crossfire signal of corresponding second frequency range（Step 255）.Frequency range selecting device 170 is by analysis second
Crossfire signal obtains the second quality information（Step 257）.
It will be appreciated that, the execution sequence of step is not limited to the description order in previous embodiment, can be according to step
Rapid execution content suitably allocates execution sequence.For example, the extraction of the second quality information（Step 250）Only need to be with the
One threshold value compares（Step 270）Before complete, however it is not limited to the first threshold value calculate（Step 230）After perform.That is,
Step 250 can be also performed before step 210 in addition to performing between step 230 and step 270, or in step 210 and step
Perform between rapid 230, or performed with step 230 simultaneously.
In sum, the quality information of bandwidth selection method according to embodiments of the present invention based on the signal of each frequency range come
The use frequency range of wave filter is determined, with dynamic select using frequency range reducing the impact caused by ambient noise interference, Jin Eryou
Effect ground lifts transmission quality and transmission efficiency.For example, when interference is disturbed for narrow frequency or Chong Die with other wireless telecommunication systems
During frequency band very little, bandwidth selection method according to embodiments of the present invention is adapted dynamically and is reduced service band using frequency range,
The energy for disturbing is suppressed by the help of wave filter, to provide signal noise power ratio.
Although the technology contents of the present invention are disclosed above with preferred embodiment, so which is not limited to the present invention,
It is any to be familiar with this those skilled in the art, in the made a little change of spirit and retouching without departing from the present invention, should all be covered by the present invention's
In category, therefore protection scope of the present invention ought be defined depending on the defined person of appended claims.
Claims (29)
1. a kind of bandwidth selection method, comprising：
Extract at least one first quality information of one first frequency range of correspondence；
One first threshold value is calculated according at least one first quality information and one first Weighted Index；
Extract one second quality information of one second frequency range of correspondence；
Compare first threshold value with second quality information to obtain one first comparative result；And
Use frequency range with first frequency range or second frequency range as a wave filter is selected according to first comparative result；
Wherein first quality information be to should the first frequency range false alarm number, to should the first frequency range reception package number
With to should the headroom channel of the first frequency range indicate at least one of number, and second quality information is to should the second frequency
Wide false alarm number, to should the second frequency range receive package number and to should the headroom channel of the second frequency range indicate in number
At least one.
2. bandwidth selection method as claimed in claim 1, wherein selected according to first comparative result with first frequency range or
Second frequency range as a wave filter use frequency range the step of include：
It is whether clean according to the transmission environment that first comparative result assesses first frequency range or second frequency range, to select with this
First frequency range or second frequency range use frequency range as this.
3. bandwidth selection method as claimed in claim 1, wherein the step of extracting first quality information includes：
Set this frequency range is used as first frequency range；
Receive mutually should the first frequency range one first crossfire signal；And
At least one first quality information is obtained by analyzing the first crossfire signal.
4. bandwidth selection method as claimed in claim 1, wherein the step of extracting second quality information includes：
Set this frequency range is used as second frequency range；
Receive mutually should the second frequency range one second crossfire signal；And
At least one second quality information is obtained by analyzing the second crossfire signal.
5. bandwidth selection method as claimed in claim 1, also includes：
After the selection step, according to one cumulative time of a time threshold timing；And
When the cumulative time time threshold is reached, re-execute this at least the extraction step of one first quality information, this
The calculation procedure of one threshold value, the extraction step of second quality information, the generation step of first comparative result and the use
The selection step of frequency range.
6. bandwidth selection method as claimed in claim 5, wherein when selected this of selection step is same as using frequency range
When selected this of front once selection step uses frequency range, increase the value of the time threshold.
7. bandwidth selection method as claimed in claim 5, also includes：
When the cumulative time time threshold is not up to, detecting receives the quality of signal, comprising：
When the selection step selects first frequency range, one the 3rd is calculated according to one second Weighted Index and first quality information
Threshold value；
When the selection step selects second frequency range, one the 3rd is calculated according to one the 3rd Weighted Index and second quality information
Threshold value；
Extract one the 3rd quality information to frequency range should be used；
Compare the 3rd threshold value with the 3rd quality information to obtain one second comparative result；And
The extraction step of first quality information, first threshold value surely whether are re-executed than relatively knot fruit Decision according to the 2nd
The calculation procedure, the extraction step of second quality information, the comparison step of first comparative result and the selection walk
Suddenly.
8. bandwidth selection method as claimed in claim 7, if wherein first frequency range is less than second frequency range, when the choosing
When selecting step and selecting first frequency range, second Weighted Index is less than 1, when the selection step selects second frequency range, the 3rd
Weighted Index is more than 1；If first frequency range is more than second frequency range, when the selection step selects first frequency range, should
Second Weighted Index is more than 1, when the selection step selects second frequency range, the 3rd Weighted Index to be less than 1.
9. bandwidth selection method as claimed in claim 1, also includes：
Detect the transmission state of the wireless telecommunication system belonging to the wave filter；And
When the transmission state be busy condition when, first quality information be to should the first frequency range false alarm number, and should
Second quality information be to should the second frequency range false alarm number；
Wherein, first Weighted Index under the busy condition less than the transmission state be idle condition under it is corresponding this first plus
Power index.
10. bandwidth selection method as claimed in claim 1, wherein in the extraction step, first quality information and this
Signal quality of any one of two quality informations including corresponding one signal quality information and multiple adjacent channels for using passage
Information, and this is continuous sequence and with identical frequency range using passage and the plurality of adjacent channel.
11. bandwidth selection methods as claimed in claim 1, wherein in the extraction step, first quality information and this
Signal quality information and multiple neighbours with respective weighted value of any one of two quality informations including a corresponding central passage
The signal quality information of nearly passage, and the central passage is with the plurality of adjacent channel is for continuous sequence and has identical frequency range.
12. bandwidth selection methods as claimed in claim 11, wherein the frequency band of the plurality of adjacent channel and the central passage
Band overlapping.
13. bandwidth selection methods as claimed in claim 11, wherein the frequency band of the plurality of adjacent channel and the central passage
Band overlapping, the weighted value of the adjacent channel less with the central passage overlapping bands is less, Chong Die with the central passage
The weighted value of the bigger adjacent channel of frequency band is bigger.
14. bandwidth selection methods as claimed in claim 1, wherein in the calculation procedure of first threshold value, this first
Limit value is the product of first Weighted Index and corresponding first quality information.
15. bandwidth selection methods as claimed in claim 1, wherein first frequency range are less than second frequency range.
16. bandwidth selection methods as claimed in claim 1, wherein second frequency range are less than first frequency range.
A kind of 17. bandwidth selection methods, comprising：
Step a:One first quality information corresponding to one of two frequency ranges is extracted, wherein described two frequency ranges are different
Value；
Step b：Compare first quality information and a predetermined threshold value；
Step c：When first quality information is more than the predetermined threshold value, an interference detecting is performed, the interference detecting includes：
One first threshold value is obtained according to first quality information and one first Weighted Index；
Extract one second quality information corresponding to the other of described two frequency ranges；
Compare first threshold value with second quality information to obtain one first comparative result；And
One in the described two frequency ranges use frequency range for a wave filter is selected according to first comparative result；And
Step c '：When first quality information is not more than the predetermined threshold value, the method includes：
The greater in described two frequency ranges is selected to use frequency range as this of the wave filter；
Read out an absolute threshold value；
Extract one the 3rd quality information to frequency range should be used；
Compare the absolute threshold value with the 3rd quality information to obtain one second comparative result；And
Decide whether that performing the interference detects according to second comparative result.
18. bandwidth selection methods as claimed in claim 17, wherein selecting described two frequency ranges according to first comparative result
In a use frequency range for a wave filter the step of include：
It is whether clean according to the transmission environment that first comparative result assesses described two frequency ranges, to select with described two frequencies
One in wide uses frequency range as this.
19. bandwidth selection methods as claimed in claim 17, wherein the interference detecting are also included：
After the selection step using frequency range, according to one cumulative time of a time threshold timing；And
When the cumulative time time threshold is reached, re-execute the interference and detect.
20. bandwidth selection methods as claimed in claim 19, wherein in interference detecting, when the selection step it is selected
This using frequency range be same as before once the selection step it is selected this use frequency range when, increase the value of the time threshold.
21. bandwidth selection methods as claimed in claim 19, wherein the interference detecting are also included：
When the cumulative time time threshold is not up to, quality detecting is performed, the quality detecting is included：
Obtain one the 3rd threshold value, wherein the 3rd threshold value according in first quality information and second quality information with should
Person and one second Weighted Index corresponding to the frequency range selected in step is selected to be calculated；
Extract one the 3rd quality information to frequency range should be used；
Compare the 3rd threshold value with the 3rd quality information to obtain one the 3rd comparative result；And
The extraction step that first quality information was detected or returned in the interference is re-executed according to the 3rd comparative result, is held again
Row step a is to step c.
22. bandwidth selection methods as claimed in claim 21, if wherein the frequency range selected in the selection step is institute
Relatively small in two frequency ranges one is stated, then second Weighted Index is less than 1；If the frequency range selected in the selection step
For one relatively large in described two frequency ranges, then second Weighted Index is more than 1.
23. bandwidth selection methods as claimed in claim 17, also include：
Detect the transmission state of the wireless telecommunication system belonging to the wave filter；And
When the transmission state is busy condition, first quality information used in the interference detecting is described two frequencies
False alarm number corresponding to one of width, and second quality information is corresponding to the other of described two frequency ranges
False alarm number；
Wherein, first Weighted Index under the busy condition less than the transmission state be idle condition under it is corresponding this first plus
Power index.
24. bandwidth selection methods as claimed in claim 23, wherein when the transmission state is not busy, first quality is believed
Cease the false alarm number corresponding to one of described two frequency ranges, receive package number, headroom channel indicate number or its
Combination, and second quality information be the false alarm number corresponding to the other of described two frequency ranges, receive package number,
Headroom channel indicates number or its combination.
25. bandwidth selection methods as claimed in claim 17, wherein in the extraction step, first quality information, this
Any one of two quality informations and the 3rd quality information signal quality information and multiple neighbours including a corresponding central passage
The signal quality information of nearly passage, and the central passage is with the plurality of adjacent channel is for continuous sequence and has identical frequency range.
26. bandwidth selection methods as claimed in claim 17, wherein in the extraction step, first quality information, this
Any one of two quality informations and the 3rd quality information are including the signal quality information of a corresponding central passage and with each
From the signal quality information of multiple adjacent channels of weighted value, and the central passage and the plurality of adjacent channel system are continuous row
Sequence and have identical frequency range.
27. bandwidth selection methods as described in claim 25 or 26, wherein the frequency band of the plurality of adjacent channel and the center
The band overlapping of passage.
28. bandwidth selection methods as claimed in claim 26, wherein the frequency band of the plurality of adjacent channel and the central passage
Band overlapping, the weighted value of the adjacent channel less with the central passage overlapping bands is less, Chong Die with the central passage
The weighted value of the bigger adjacent channel of frequency band is bigger.
29. bandwidth selection methods as claimed in claim 17, wherein in the calculation procedure of first threshold value, this first
Limit value is the product of first Weighted Index and corresponding first quality information.
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