CN104660302B - Negotiation AFH method based on bitmap - Google Patents
Negotiation AFH method based on bitmap Download PDFInfo
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- CN104660302B CN104660302B CN201510073197.6A CN201510073197A CN104660302B CN 104660302 B CN104660302 B CN 104660302B CN 201510073197 A CN201510073197 A CN 201510073197A CN 104660302 B CN104660302 B CN 104660302B
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Abstract
The invention discloses a kind of negotiation AFH method based on bitmap.The air interference such as streaming media broadcast, equipment power frequency present on industry measurement frequency range (470 510MHz), the present invention produces multistage bitmap channel sets using the method for frequency spectrum state aware, using preferred channels set as networking channel switch sequence, optimize network entry time, using public preferred channels set as negotiation AFH sequence, timing updates multistage bitmap channel sets, it is ensured that the success rate of communication and frequency hopping reliability, reduces resource consumption.
Description
Technical field
The invention belongs to communication technical field, is related to a kind of negotiation frequency-hopping method based on frequency spectrum perception, can be used on cognition
In radio net.
Background technology
In recent years, with the development of wireless communication technology, frequency spectrum resource becomes more and more rare.In industry measurement frequency range
(470-510MHz) wireless signal such as streaming media broadcast, equipment power frequency present on, and these wireless signals extensively deposit
, therefore when using this band communication when, how under less resource consumption, to avoid co-channel interference, it is ensured that communication success rate and
Frequency hopping reliability becomes the problem for receiving significant attention.
Continuous development however as communication technology and the continuous improvement to QoS requirement, a lot of guarantee communications in the past
The method of success rate has its shortcoming and drawback, how efficiently to avoid the air interference of industry spot appearance and improve communicating into
Power becomes an important problem.
At present, for avoiding co-channel interference, frequency hopping is a kind of conventional Anti-Jamming Technique.Frequency hopping has time slot frequency hopping and self adaptation
Frequency hopping, time slot frequency hopping switch communication channel in each time slot according to frequency hop sequences and channel drift amount according to certain rule, when
Gap frequency hopping may cause the decline of transmission reliability because of partial channel degradation.AFH is in a pseudorandom
Under the control of sequence, radio-frequency apparatus send data on different channels, and receiving terminal is using same pseudo-random sequence control frequency
The change in road, but under the control of pseudo-random sequence, frequency hopping does not carry out frequency spectrum perception in advance to frequency range, channel quality not true
The qualitative reliability for causing frequency hopping reduces the decline with receptance.
Content of the invention
Present invention aims to the deficiencies in the prior art, propose a kind of negotiation frequency-hopping method based on bitmap,
Consult frequency hopping strategies raising communication success rate and stability by optimizing, improve into net spee and reduce power consumption.
In order to realize object of the invention it is proposed technical scheme below：
A kind of negotiation AFH method based on bitmap, comprises the steps：
1) initialize：
1a) first the energy of the industry measurement frequency range of 470-510MHz is scanned after electricity on device, to frequency spectrum state
Cognition and analysis is carried out, classification is extracted to channel, 3 grades of bitmap channel sets are generated by channel quality, by quality from good to difference
It is divided into bitmap1, bitmap2, bitmap3；
1b) quickly networked based on the time difference of preferred channels set：Active node A and passive section based on point-to-point communication
Point B, during networking, active node A is according in step 1a) sequence of preferred channels set bitmap1 that generates of stage switches successively
Channel sends beacon bags；Passive node B is in reception state, according to itself preferred channels set bitmap1 sequence switching letter
Road；Network successfully when A, B communicate with being successfully in same channel chansame, channel chansame is believed as initial communication
Road, it is achieved that quick networking；
1c) AFH sequence is generated：After device networking success, mutual preferred channels set is exchanged first
Bitmap1, and select two intersection of sets collection to be stored in public preferred channels set bitmap0, the sequence conduct of set bitmap0
Frequency hop sequences during AFH；
2) consult AFH：
After device networking success enter normal work time slot, monitor in communication process currently used channel acceptance rate and
The change of LQI, when acceptance rate drops to threshold value P1 or when LQI is less than threshold value L1, enters and consults the frequency hopping stage, fix at certain
Time slot moment A, B node are simultaneously switching to subsequent channels according to the sequence in public preferred channels set bitmap0 and are communicated,
Two nodes are downgraded to present channel in channel set bitmap2 simultaneously；
3) more levels of channel set bitmap Timing Negotiations update：
3a) in normal work time slot, some time slots are chosen as realizing more levels of channel set bitmap Timing Negotiations more
New renewal time slot, realizes that dynamic is cognitive and adjusts, and finds the variations in multi-stage channel set bitmap in time, and
The public preferred channels set bitmap0 of Shi Gengxin, so that reduce node power consumption on the premise of detection confidence is ensured；
Time slot is being updated 3b), and whether monitoring channel set bitmap0 has interference channel chanbad to occur, if occurring
Chanbad then by A, B node negotiation communication, by the chanbad channel degradations in set bitmap0, without chanbad then not
Operation；
Time slot is being updated 3c), the change of multistage bitmap set is being monitored, as set bitmap1, bitmap2, bitmap3
In channel quality occur change when carry out upgrade or downgrade process to respective channel, when wherein set bitmap1 changes,
Allow A, B to hold consultation communication, check whether change channel produces impact to public preferred channels, produce affect then to update public
Preferred channels bitmap0.
Wherein described step 1a) in energy scan refer to each channel for scanning 470-510MHz in non-communicating
RSSI energy values, the spacing channel of channel are 200khz, have channel 201；Channel power values are less than threshold value R1
Channel is considered as glitch-free moderately good channel and is stored in 1 grade of channel set bitmap1, and channel power values are simultaneously low higher than threshold value R1
It is considered as unstable channel in the channel of R2 and is stored in 2 grades of channel set bitmap2, channel power values is considered as higher than the channel of threshold value R2
Noisy bad channel is stored in 3 grades of channel bitmap3.
Wherein described step 1b) in A nodes send beacon bags when channel switching time interval be A transmission one
Beacon bags receive B to A and beam back ACK corresponding minimum transmitting-receiving times tmin, the minimum interval of the switching channel of B node
For minimum transmitting-receiving time tminx number of channel nbitmap0.
Spectrum cognitive analysis spectrum state of the present invention by the pre- frequency sweep of initial phase, then presses channel quality by channel
It is divided into 3 grades of bitmap set, consults to determine public preferred channels set by exchanging respective preferred channels set bitmap1
Bitmap0, and it is improve the success rate and frequency hopping accuracy and reliability of communication as frequency hop sequences.By with initial
The change stage, respective preferred channels set bitmap1 optimized network entry time as respective networking frequency hop sequences.Normal work
In the stage, automatically according to channel communication success rate and channel quality LQI, carry out AFH.Time slot is updated by bitmap, more
New bitmap channel sets at different levels, and consult to update public preferred channels set bitmap0, ensure communication success rate and can frequency hopping
Reliability.
Description of the drawings
Fig. 1 is the negotiation AFH schematic device based on bitmap；
Fig. 2 is the use scene graph of the present invention；
Fig. 3 is the whole implementation flow chart of the present invention；
Fig. 4 is multistage bitmap set generation figure；
Fig. 5 is frequency spectrum discerning design sketch.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with the drawings and specific embodiments,
The present invention is described in more detail.
Fig. 1 is the negotiation AFH apparatus structure schematic diagram based on bitmap, and the device includes that frequency hop sequences are generated
The multistage bitmap makers 103 of device 101, frequency hop sequences negotiator 102, frequency spectrum perception, spectrum monitoring Bitmap renovators 104.
With reference to Fig. 2, apparatus of the present invention include host node A and from node B, also interference signal S using scene.
With reference to Fig. 3, the specific embodiment of the present invention is as follows：
Step 1：Initialization：
1a) carry out frequency spectrum perception first and generate multistage bitmap set, generating mode is joined with reference to Fig. 4, frequency spectrum discerning effect
According to Fig. 5, channel of the threshold value less than R1 is stored in set
Bitmap1={ changood1, changood2 ..., changoodm },
Channel set of the threshold value between R1 and R2
Bitmap2={ chancom1, chancom2 ..., changcomn },
Channel set of the threshold value more than R3
Bitmap3={ chanbad1, chanbad2 ..., chanbadk },
Wherein threshold size relation is R1<R2<The bitmap set units at different levels of R3, wherein m+n+k=201, A and B node
Element and m, n, k value are not necessarily identical.
1b) beacon frame networks, and network stage A, B node switch channel successively according to itself preferred channels set bitmap1,
A sends beacon bags in each channel, and B is in reception state, returns an ACK corresponding after the data of A are received.Now enter
Net successfully, present channel is used as initial channel.
1c) various preferred channels set bitmap1 are exchanged in initial channel, consult public preferred channels set bitmap0
As frequency hop sequences.
Step 2：Consult to update frequency hop sequences：
Transmitting-receiving operation is carried out in normal work time slot 2a), and whether monitoring present channel acceptance rate or LQI reach threshold value, such as
Fruit is then by frequency hop sequences frequency hopping backward is consulted, and operates if not other are then continued
2b) time slot is updated in bitmap, monitor the variations of bitmap set at different levels, bitmap is updated time slot
When channel quality the channel of change assigned in corresponding bitmap again, while the dimensions of variability that respective bitmap1 is gathered by A, B
Element is exchanged, if producing new common factor, adds bitmap0；No longer it is that the channel of common set then removes bitmap0.
Particular embodiments described above, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, the be should be understood that specific embodiment that the foregoing is only the present invention is not limited to the present invention,
All any modification, equivalent substitution and improvements that within the spirit and principles in the present invention, is done etc., should be included in the present invention's
Within protection domain.
Claims (3)
1. a kind of negotiation AFH method based on bitmap, comprises the steps：
1) initialize：
1a) first the energy of the industry measurement frequency range of 470-510MHz is scanned after electricity on device, frequency spectrum state is carried out
Cognitive and analysis, extracts classification to channel, generates 3 grades of bitmap channel sets by channel quality, by quality from good to difference is
bitmap1、bitmap2、bitmap3；
1b) quickly networked based on the time difference of preferred channels set：Active node A and passive node B based on point-to-point communication,
During networking, active node A is according in step 1a) sequence of preferred channels set bitmap1 that generates of stage switches channel successively
Beacon bags are sent, passive node B is in reception state, switches channel according to itself preferred channels set bitmap1 sequence, when
A, B communicate with being successfully in same channel chansame and network successfully, and channel chansame is realized i.e. as initial communication channel
Quick networking；
1c) AFH sequence is generated：After device networking success, mutual preferred channels set bitmap1 is exchanged first, and
Two intersection of sets collection are selected to be stored in public preferred channels set bitmap0, the sequence of set bitmap0 is used as AFH
When frequency hop sequences；
2) consult AFH：
Normal work time slot is entered after device networking success, the acceptance rate and LQI of currently used channel in communication process, is monitored
Change, when acceptance rate drops to threshold value P1 or when LQI is less than threshold value L1, enters and consults the frequency hopping stage, in certain fixation time slot
Moment A, B node are simultaneously switching to subsequent channels according to the sequence in public preferred channels set bitmap0 and are communicated, while
Two nodes are downgraded to present channel in channel set bitmap2；
3) more levels of channel set bitmap Timing Negotiations update：
3a) in normal work time slot, some time slots are chosen as realizing what more levels of channel set bitmap Timing Negotiations updated
Time slot is updated, is realized that dynamic is cognitive and adjusts, is found the variations in multi-stage channel set bitmap in time, in time more
New public preferred channels set bitmap0, so that reduce node power consumption on the premise of detection confidence is ensured；
Time slot is being updated 3b), and whether monitoring channel set bitmap0 has interference channel chanbad to occur, if there is chanbad
Then by A, B node negotiation communication, the chanbad channel degradations in set bitmap0 are not then operated without chanbad；
Time slot is being updated 3c), the change of multistage bitmap set is being monitored, when in set bitmap1, bitmap2, bitmap3
Channel quality occurs carrying out respective channel upgrade or downgrade process during change, when wherein set bitmap1 changes, that is, allows
A, B hold consultation communication, check whether change channel produces impact to public preferred channels, and producing affects then to update public optimum
Channel bitmap0.
2. the negotiation AFH method based on bitmap according to claim 1, wherein described step 1a) in energy
Amount scanning refers to the RSSI energy values of each channel for scanning 470-510MHz in non-communicating, the spacing of channel
Channel is 200khz, has channel 201；Channel power values less than threshold value R1 channel be considered as glitch-free moderately good
Channel is stored in 1 grade of channel set bitmap1, and channel power values are considered as unstable channel less than the channel of R2 simultaneously higher than threshold value R1
2 grades of channel set bitmap2 are stored in, channel power values are considered as noisy bad channel higher than the channel of threshold value R2 and are stored in 3 grades
Channel bitmap3.
3. the negotiation AFH method based on bitmap according to claim 1, wherein described step 1b) in A
The time interval of channel switching when node sends beacon bags receives B for A one beacon bag of transmission to A and beams back ACK phases
The minimum transmitting-receiving time tmin for answering, the minimum interval of the switching channel of B node is the minimum transmitting-receiving time tminx numbers of channel
nbitmap0.
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| CN107453826B (en) * | 2017-08-14 | 2020-08-14 | 广东电网有限责任公司电力科学研究院 | Micropower wireless frequency locking communication method and device |
| CN111741476B (en) * | 2020-05-22 | 2023-04-07 | 深圳市风云实业有限公司 | Automatic channel avoidance anti-interference transmission method |
| CN112543494B (en) * | 2020-12-01 | 2021-09-17 | 北京时代凌宇信息技术有限公司 | Method and equipment for fast network access and automatic frequency hopping in wireless communication |
| CN113179141A (en) * | 2021-04-25 | 2021-07-27 | 赵天铭 | Self-adaptive channel selection algorithm for network scheduling |
| CN113179142A (en) * | 2021-04-25 | 2021-07-27 | 赵天铭 | Network scheduling system for self-adaptive channel selection |
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| CN101242239A (en) * | 2007-02-09 | 2008-08-13 | 大唐移动通信设备有限公司 | Method, system and terminal for realizing uplink frequency jumping |
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| CN102450050A (en) * | 2010-06-18 | 2012-05-09 | 联发科技股份有限公司 | System and method for coordinating multiple radio transceivers within the same device platform |
| EP2793410A1 (en) * | 2006-01-18 | 2014-10-22 | NTT DoCoMo, Inc. | Base station and method for efficiently transmitting a control channel |
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| CN101296139A (en) * | 2007-04-26 | 2008-10-29 | 北京三星通信技术研究有限公司 | Frequency spectrum cooperation method of dynamic frequency hopping wireless area network |
| CN101888261B (en) * | 2010-05-28 | 2013-02-27 | 北京科技大学 | Frequency hopping device and method on reconstructable channel set |
| CN102045889B (en) * | 2010-12-02 | 2013-10-23 | 中国电子科技集团公司第五十四研究所 | High-capacity adaptive frequency-hopping signal processing terminal |
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|---|---|---|---|---|
| EP2793410A1 (en) * | 2006-01-18 | 2014-10-22 | NTT DoCoMo, Inc. | Base station and method for efficiently transmitting a control channel |
| CN101242239A (en) * | 2007-02-09 | 2008-08-13 | 大唐移动通信设备有限公司 | Method, system and terminal for realizing uplink frequency jumping |
| CN101953107A (en) * | 2007-09-19 | 2011-01-19 | 新加坡科技研究局 | Methods for network throughput enhancement |
| CN102450050A (en) * | 2010-06-18 | 2012-05-09 | 联发科技股份有限公司 | System and method for coordinating multiple radio transceivers within the same device platform |
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