CN105792228A - Cognitive radio frequency spectrum sharing system and frequency spectrum sharing method adopted by same - Google Patents
Cognitive radio frequency spectrum sharing system and frequency spectrum sharing method adopted by same Download PDFInfo
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- CN105792228A CN105792228A CN201610357091.3A CN201610357091A CN105792228A CN 105792228 A CN105792228 A CN 105792228A CN 201610357091 A CN201610357091 A CN 201610357091A CN 105792228 A CN105792228 A CN 105792228A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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Abstract
The invention relates to a cognitive radio frequency spectrum sharing system.The system comprises a cognitive system and a cognitive database.The cognitive system senses available sharing resource groups included in frequency spectrums and reports information of all the available sharing resource groups, and the cognitive database conducts frequency spectrum coordination and distribution according to the information, provided by the cognitive system, of the available sharing resource groups in combination with a decision making strategy.An adopted frequency spectrum sharing method includes the following steps that 1, the cognitive system senses all the sharing resource groups, judges the available sharing resource groups according to available values of all the sharing resource groups, conducts use priority division on the available sharing resource groups and reports priority information and the available values of all the available sharing resource groups to the cognitive database; 2, the cognitive database gives preference to the available sharing resource groups with the largest available value for distribution and use according to the priority information and all the available sharing resource groups, reported by the cognitive system.The use efficiency of frequency spectrum resources can be improved.
Description
Technical field
The present invention relates to a kind of cognitive radio frequency spectrum shared system for coordinating and distribute frequency spectrum resource and the frequency spectrum sharing method adopted in this cognitive radio frequency spectrum shared system.
Background technology
230MHz frequency range includes 223.025～235.000 and is total to 12MHz bandwidth.And being allocated with 25kHz for a frequency at present, totally 480 frequencies, wherein nearly 100 frequencies are allocated to the energy, army, meteorology, earthquake, water conservancy, Di Kuang, light industry and construction totally 8 ministries and commissions' uses by National Radio management board.All the other 380 frequencies, are allocated according to industry requirement by local radio administration.230MHz frequency range mainly adopts arrowband data radio station system to carry out collection and the transmission of industry wireless data.Along with the deep development of the industrial application of information technology, the broadband demand of industry wireless private network strengthens day by day so that the frequency spectrum resource growing tension of 230MHz frequency range.
When 230MHz frequency range carries out sharing planning, the broadband demand of sector application should be met, also need to consider by the compatibility of narrowband systems, to realize seamlessly transitting simultaneously.The frequency spectrum share planning of 230MHz frequency range can adopt following scheme: the division methods that the frequency bandwidth of (1) 230MHz frequency range keeps original 25kHz to be a frequency, to be guaranteed in the normal operation by arrowband data radio station system.Cognitive system can aggregate into wide-band spectrum resources by modes such as carrier aggregation and use；(2) 230MHz frequency range is divided into N number of shared resource group, as shown in Figure 1.Cognitive system will apply for that one or more share spectrum resources uses in units of shared resource group, use procedure needs evade in shared resource group with frequency.Meanwhile, in order to ensure that multiple Industry system shares use frequency spectrum resource in 230MHz frequency range simultaneously, it is possible to apply at most each cognitive system and be polymerized shared resource group quantity being limited.
And in cognitive radio frequency spectrum secret sharing, cognitive system can the change of wireless frequency spectrum environment around perception, study, self adaptation, by the interaction with wireless frequency spectrum environment around, cognitive system is in conjunction with frequency spectrum perception, spectrum management, frequency spectrum mobility and four optimum idle frequency spectrums of function dynamic access of frequency spectrum share, it is achieved efficient communication.Current frequency spectrum share scheme mainly includes two kinds, a kind of frequency spectrum share scheme being based on mandate frequency spectrum access, in this scheme, cognitive radio system is divided into primary user and time user, primary user is the authorized user of certain frequency range, when this frequency range free time, secondary user can access this and authorize frequency spectrum when not affecting primary user；Another kind is based on the frequency spectrum share scheme of fair competition, and in this scheme, cognitive radio system does not differentiate between primary and secondary, but carrys out share spectrum resources by fair competition.For 230MHz frequency range, owing to this frequency range is shared by multiple Industry system, therefore it is suitable for the scheme adopting cognitive radio system fair competition to share frequency spectrum.And the method carrying out spectrum management and distribution with authorization that 230MHz frequency range adopts at present so that the availability of frequency spectrum of 230MHz frequency range is relatively low.
Summary of the invention
It is an object of the invention to provide a kind of cognitive radio frequency spectrum shared system that can improve frequency spectrum resource service efficiency.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of cognitive radio frequency spectrum shared system, for coordinating and distribute frequency spectrum resource, described cognitive radio frequency spectrum shared system include that perceived spectral comprises can shared resource group and by report each described can shared resource group information cognitive system, according to described cognitive system provide described in can the information of shared resource group carry out the cognitive database of spectral coordination and distribution in conjunction with self decision strategy.
Cognitive nodes that described cognitive system reports after including the usable levels for calculating each described shared resource group and judging the shared resource group that can use accordingly, each the available described shared resource group reported according to each described cognitive nodes usable levels calculate the average usable levels of each described shared resource group and divide the use priority of each described shared resource group to carry out the location resource allocation center of spectral coordination and distribution according to the average usable levels of resource group shared each described and the shared resource group available threshold of setting.
Described cognitive nodes is the one in following three kinds of situations:
(1) described cognitive nodes include frequency that each described shared resource group of direct perception comprises and judge the frequency that can use, whether can with the base station after calculating the usable levels of each described shared resource group and judging the shared resource group that can use accordingly, the usable levels of described available shared resource group reported according to each described frequency；
(2) described cognitive nodes include frequency that each described shared resource group of perception comprises the terminal judging the frequency that can use and according to each described frequency of described terminal to report whether can with confirm available frequency, whether can with the base station after calculating the usable levels of each described shared resource group and judging the shared resource group that can use accordingly, the usable levels of described available shared resource group reported according to the described each available frequency confirmed；
(3) whether described cognitive nodes includes frequency that each described shared resource group of perception comprises and judges the terminal of the frequency that can use and can use according to each described frequency of described terminal to report and confirm available frequency, according to whether the described each available frequency confirmed with calculating the usable levels of each described shared resource group and can be judged the shared resource group that the can use frequency that directly each described shared resource group of perception comprises accordingly and judge the frequency that can use simultaneously, according to whether each described frequency can use the usable levels calculating each described shared resource group, thus the base station that the usable levels of described available shared resource group is reported after going out available shared resource group by comprehensive descision.
Described base station is preset with for judge described shared resource group whether can frequency range available threshold, described base station is preset with for judge described frequency whether can frequency available threshold.
Present invention also offers the frequency spectrum sharing method that above-mentioned cognitive radio frequency spectrum shared system adopts, this frequency spectrum sharing method comprises the steps:
(1) each described shared resource group of described cognitive system perception the usable levels according to each described shared resource group judge the shared resource group that can use, are undertaken available shared resource group using priority, after dividing, the usable levels of precedence information and each available shared resource group is reported described cognitive database；
(2) described cognitive database reports according to described cognitive system precedence information and the usable levels of each available shared resource group in conjunction with self decision strategy, the maximum available shared resource group of prioritizing selection usable levels be allocated for.
In described step (1), described cognitive system reports location resource allocation center after passing through cognitive nodes perception and calculating the usable levels of each described shared resource group and judge the shared resource group that can use accordingly, and the usable levels of each available described shared resource group that described location resource allocation center reports according to each described cognitive nodes calculates the average usable levels of each described shared resource group and divides the use priority of each described shared resource group according to the average usable levels of resource group shared each described and the shared resource group available threshold of setting.
Described cognitive nodes adopts the one in following three kinds of working methods:
(1) described cognitive nodes adopts base station, frequency that each described shared resource group of the direct perception in described base station comprises and judge the frequency that can use, according to whether each described frequency with calculating the usable levels of each described shared resource group and can judge that the shared resource group that can use reports；
(2) described cognitive nodes adopts terminal and base station, frequency that each described shared resource group of described terminal perception comprises also judges the frequency that can use, and whether described base station can with confirming available frequency, according to whether each described frequency confirmed with calculating the usable levels of each described shared resource group and can judge that the shared resource group that can use reports according to each described frequency of described terminal to report；
(3) described cognitive nodes adopts terminal and base station, frequency that each described shared resource group of described terminal perception comprises also judges the frequency that can use, whether described base station can be used according to each described frequency of described terminal to report on the one hand confirms available frequency, according to whether each described frequency confirmed with calculating the usable levels of each described shared resource group and can judge the shared resource group that can use, the another aspect frequency that directly each described shared resource group of perception comprises also judges the frequency that can use, according to whether each described frequency with calculating the usable levels of each described shared resource group and can judge the shared resource group that can use, described base station considers the usable levels of the available described shared resource group that two aspects obtain and finally judges that the shared resource group that can use reports.
According to the frequency range available threshold preset, described base station judges whether described shared resource group can be used；According to the frequency available threshold preset, described base station judges whether described frequency can be used.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that the cognitive radio frequency spectrum shared system of the present invention can determine available frequency spectrum resource in conjunction with its frequency spectrum sharing method before only distributing with frequency spectrum resource, and available frequency spectrum resource is carried out priority division, make it possible to the high frequency spectrum resource of priority allocation priority for, thus improve the service efficiency of frequency spectrum resource.
Accompanying drawing explanation
Accompanying drawing 1 is shared resource group for 230MHz frequency range and is divided schematic diagram.
Accompanying drawing 2 is the system architecture schematic diagram of the cognitive radio frequency spectrum shared system of the present invention.
Accompanying drawing 3 is the schematic flow sheet of the frequency spectrum sharing method of the cognitive radio frequency spectrum shared system employing of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment one: as shown in Figure 2, a kind of cognitive radio frequency spectrum shared system for coordinating and distribute frequency spectrum resource, including cognitive system and cognitive database two large divisions, a cognitive database can connect and overlaps cognitive system more.
Available shared resource group that cognitive system comprises for perceived spectral also will report the information of each available shared resource group.Concrete, when cognitive system adopts cellular radio Communication system, it includes cognitive nodes and location resource allocation center.
Cognitive nodes is for reporting after calculating the usable levels of each shared resource group and judging the shared resource group that can use accordingly, and it can adopt the one in following three kinds of situations:
(1) cognitive nodes includes base station, and whether frequency that this base station comprises for each shared resource group of direct perception is also judged the frequency that can use, the usable levels of available shared resource group can be reported with after calculating the usable levels of each shared resource group and judging the shared resource group that can use accordingly according to each frequency；
(2) cognitive nodes includes terminal and base station, frequency that wherein terminal comprises for each shared resource group of perception also judges the frequency that can use, and whether whether base station can with confirming available frequency, the usable levels of available shared resource group can be reported with after calculating the usable levels of each shared resource group and judging the shared resource group that can use accordingly according to each available frequency confirmed for each frequency according to terminal to report；
(3) cognitive nodes includes terminal and base station, wherein terminal is used for the frequency that each shared resource group of perception comprises the terminal judging the frequency that can use, whether base station can be used for each frequency according to terminal to report on the one hand confirms available frequency, according to whether each available frequency confirmed with calculating the usable levels of each shared resource group and can judge the shared resource group that can use accordingly, the frequency that comprises for each shared resource group of direct perception on the other hand also judges the frequency that can use, according to whether each frequency can use the usable levels calculating each shared resource group, thus the usable levels of available shared resource group is reported after going out available shared resource group by comprehensive descision.
In the base station that cognitive nodes comprises, be preset with for judge to share resource group whether can frequency range available threshold, base station is preset with for judge frequency whether can frequency available threshold.
The usable levels of the location resource allocation center each available shared resource group for reporting according to each cognitive nodes calculates the average usable levels of each shared resource group and divides the use priority of each shared resource group according to the average usable levels of each shared resource group and the shared resource group available threshold of setting, uses with distribution for the follow-up spectral coordination that carries out.
The information of the cognitive database available shared resource group for providing according to cognitive system (includes the average usable levels of shared resource group and the priority that can use) and carries out spectral coordination and distribution in conjunction with self decision strategy.
The enforcement step of the frequency spectrum sharing method that above-mentioned cognitive radio frequency spectrum shared system adopts is as shown in Figure 3, the part steps two large divisions of its part steps that can be divided into cognitive system and cognitive database, first, the each shared resource group of cognitive system perception the usable levels according to each shared resource group judge the shared resource group that can use, and are undertaken available shared resource group using priority, after dividing, the usable levels of precedence information and each available shared resource group is reported cognitive database.Then, precedence information that cognitive database reports according to cognitive system and the usable levels of each available shared resource group in conjunction with self decision strategy, the maximum available shared resource group of prioritizing selection usable levels be allocated for.
Concrete, cognitive system reports location resource allocation center after passing through cognitive nodes perception and calculating the usable levels of each shared resource group and judge the shared resource group that can use accordingly, and the usable levels of each available shared resource group that location resource allocation center reports according to each cognitive nodes calculates the average usable levels of each shared resource group and divides the use priority of each shared resource group according to the average usable levels of each shared resource group and the shared resource group available threshold of setting.
Cognitive nodes adopts the one in following three kinds of working methods:
Working method (1): cognitive nodes adopts base station, now, each shared resource group of the direct perception in base station comprises frequency and judge the frequency that can use, according to whether each frequency with calculating the usable levels of each shared resource group and can judge that the shared resource group that can use reports.
Working method (2): cognitive nodes adopts terminal and base station, frequency that each shared resource group of terminal perception comprises also judges the frequency that can use, and whether base station can with confirming available frequency, according to whether each frequency confirmed with calculating the usable levels of each shared resource group and can judge that the shared resource group that can use reports according to each frequency of terminal to report.
Working method (3): cognitive nodes adopts terminal and base station, frequency that each shared resource group of terminal perception comprises also judges the frequency that can use, whether base station can be used according to each frequency of terminal to report on the one hand confirms available frequency, according to whether each frequency confirmed with calculating the usable levels of each shared resource group and can judge the shared resource group that can use, the another aspect frequency that directly each shared resource group of perception comprises also judges the frequency that can use, according to whether each frequency with calculating the usable levels of each shared resource group and can judge the shared resource group that can use, base station considers the usable levels of the available shared resource group that two aspects obtain and finally judges that the shared resource group that can use reports.
The work of cognitive system specifically includes following steps:
1. the frequency in shared resource group is carried out perception by cognitive nodes, it is determined that whether frequency can be used.
If only with base station perception, then base station records whether each frequency can be used after each frequency in each shared resource group is carried out perception.
If adopting terminal perception, then each frequency in each shared resource group is carried out perception by terminal, with regard to perception whether can result report base station, base station is further according to whether the results verification frequency of each terminal to report can be used, now, it is preset with frequency available threshold a for frequency in a base stationfp, as the usable levels b of the i-th frequency calculatedfpI () meets bfp(i)≥afpTime, then base station thinks that this frequency can be used, otherwise it is assumed that this frequency is unavailable, wherein
If adopting base station and terminal to carry out collaborative perception, then base station is determined when whether each frequency is available, need to consider the frequency that himself draws whether can result and the frequency that draws based on terminal perception whether can result, only when perception frequency is available for the two simultaneously, just confirm that this frequency can be used.
When terminal thinks that base station reports its sensing results, whether the mode that can adopt bitmap can with being identified to frequency, and as " 1 " represents that frequency can be used, " 0 " represents that frequency is unavailable.
2. the cognitive nodes applicable according to frequency, adds up the availability of each shared resource group, calculates the usable levels of each shared resource group.
The base station of cognitive nodes is provided with frequency range available threshold a for each shared resource groupcsFor judging to share whether resource group can be used, as the usable levels b of the shared resource group obtained according to cognitive nodes statisticscs(i)≥acsTime, then base station thinks that this shared resource group can use, otherwise it is assumed that this shared resource group is unavailable, whereinFor only comprising the system of base station, base station is according to usable levels b to shared resource group of self sensing resultscsI () adds up, according to the terminal coordinated and base station, then after based on the sensing results of terminal, base station confirms whether frequency can use, then the usable levels b to shared resource groupcsI () adds up.Terminal and base station according to collaborative work, base station then needs to consider self sensing results and terminal sensing results, the availability of shared resource group is added up, only when perception frequency is available for two aspects simultaneously, just confirm that this frequency can be used, thus calculating the usable levels b of shared resource group furthercs(i)。
3. available shared resource group and usable levels thereof are reported location resource allocation center by cognitive nodes.
Now, share whether resource group with bitmap mode can also be adopted to be identified, additionally can also need definition respective field that the available usable levels sharing resource group is identified.
4. the availability of shared resource group is added up by location resource allocation center, calculates the average usable levels of each shared resource group, and the average usable levels according to each shared resource group carries out using priority to divide.
For location resource allocation center, it is provided with shared resource group available threshold a for each shared resource groupmc, location resource allocation center calculates the average usable levels b of each shared resource group according to oneself usable levels of shared resource that each (1～n) cognitive nodes reportsmcI (), works as bmc(i)≥amcTime, then location resource allocation center thinks that this shared resource group can use, otherwise it is assumed that this shared resource group is unavailable, whereinN is the quantity of cognitive nodes.
5. available shared resource group and usable levels thereof and available priorities are reported cognitive database by location resource allocation center.
Here, available shared resource group is also adopted by bitmap mode and indicates, and the usable levels of available shared resource group needs additionally definition respective field to be identified.So far, the work process of cognitive system terminates, and cognitive database continues following steps.
6. cognitive database reports according to cognitive system precedence information and the usable levels of each available shared resource group in conjunction with self decision strategy, the maximum available shared resource group of prioritizing selection usable levels be allocated for.
In existing frequency spectrum sharing method, cognitive system is when carrying out share spectrum resources application, can according to business demand, frequency spectrum resource demand is reported cognitive database, by cognitive database according to current frequency spectrum resource service condition, the website distribution of cognitive system, distributes correspondingly frequency spectrum resource and uses to cognitive system.When cognitive system obtains share spectrum resources from cognitive database, may due to the difference of cognitive system self-ability, or there is the reasons such as interference in adjacent sites or successive bands with other cognitive system, cause that the frequency spectrum resource applied for is partly or entirely unavailable.Now, cognitive system needs to carry out repeatedly consulting could apply for arriving share spectrum resources with cognitive database, increases the time delay of frequency spectrum application, it is possible to will be unable to meet the response delay requirement of business.And the present invention provides a kind of frequency spectrum share resource application method, cognitive system is before carrying out frequency spectrum resource application, available spectrum resources is determined by frequency spectrum perception, and carry out using priority to divide to available frequency spectrum resource, make cognitive database priority allocation the frequency spectrum resource that priority is high can be used to use to cognitive system, avoid cognitive system application to disabled frequency spectrum resource, the use of 230MHz frequency range can be planned again, spectrum efficiency can be effectively improved, alleviate the contradiction that 230 frequency range frequency spectrum resource supply and demand are nervous.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (8)
1. a cognitive radio frequency spectrum shared system, for coordinating and distributing frequency spectrum resource, it is characterised in that: described cognitive radio frequency spectrum shared system include that perceived spectral comprises can shared resource group and by report each described can shared resource group information cognitive system, according to described cognitive system provide described in can the information of shared resource group carry out the cognitive database of spectral coordination and distribution in conjunction with self decision strategy.
2. cognitive radio frequency spectrum shared system according to claim 1, it is characterised in that: cognitive nodes that described cognitive system reports after including the usable levels for calculating each described shared resource group and judging the shared resource group that can use accordingly, each the available described shared resource group reported according to each described cognitive nodes usable levels calculate the average usable levels of each described shared resource group and divide the use priority of each described shared resource group to carry out the location resource allocation center of spectral coordination and distribution according to the average usable levels of resource group shared each described and the shared resource group available threshold of setting.
3. cognitive radio frequency spectrum shared system according to claim 2, it is characterised in that: described cognitive nodes is the one in following three kinds of situations:
(1) described cognitive nodes include frequency that each described shared resource group of direct perception comprises and judge the frequency that can use, whether can with the base station after calculating the usable levels of each described shared resource group and judging the shared resource group that can use accordingly, the usable levels of described available shared resource group reported according to each described frequency；
(2) described cognitive nodes include frequency that each described shared resource group of perception comprises the terminal judging the frequency that can use and according to each described frequency of described terminal to report whether can with confirm available frequency, whether can with the base station after calculating the usable levels of each described shared resource group and judging the shared resource group that can use accordingly, the usable levels of described available shared resource group reported according to the described each available frequency confirmed；
(3) whether described cognitive nodes includes frequency that each described shared resource group of perception comprises and judges the terminal of the frequency that can use and can use according to each described frequency of described terminal to report and confirm available frequency, according to whether the described each available frequency confirmed with calculating the usable levels of each described shared resource group and can be judged the shared resource group that the can use frequency that directly each described shared resource group of perception comprises accordingly and judge the frequency that can use simultaneously, according to whether each described frequency can use the usable levels calculating each described shared resource group, thus the base station that the usable levels of described available shared resource group is reported after going out available shared resource group by comprehensive descision.
4. cognitive radio frequency spectrum shared system according to claim 3, it is characterized in that: described base station is preset with for judge described shared resource group whether can frequency range available threshold, described base station is preset with for judge described frequency whether can frequency available threshold.
5. the frequency spectrum sharing method that a cognitive radio frequency spectrum shared system as claimed in claim 1 adopts, it is characterised in that: described frequency spectrum sharing method comprises the steps:
(1) each described shared resource group of described cognitive system perception the usable levels according to each described shared resource group judge the shared resource group that can use, are undertaken available shared resource group using priority, after dividing, the usable levels of precedence information and each available shared resource group is reported described cognitive database；
(2) described cognitive database reports according to described cognitive system precedence information and the usable levels of each available shared resource group in conjunction with self decision strategy, the maximum available shared resource group of prioritizing selection usable levels be allocated for.
6. frequency spectrum sharing method according to claim 5, it is characterized in that: in described step (1), described cognitive system reports location resource allocation center after passing through cognitive nodes perception and calculating the usable levels of each described shared resource group and judge the shared resource group that can use accordingly, the usable levels of each available described shared resource group that described location resource allocation center reports according to each described cognitive nodes calculates the average usable levels of each described shared resource group and divides the use priority of each described shared resource group according to the average usable levels of resource group shared each described and the shared resource group available threshold of setting.
7. frequency spectrum sharing method according to claim 6, it is characterised in that: described cognitive nodes adopts the one in following three kinds of working methods:
(1) described cognitive nodes adopts base station, frequency that each described shared resource group of the direct perception in described base station comprises and judge the frequency that can use, according to whether each described frequency with calculating the usable levels of each described shared resource group and can judge that the shared resource group that can use reports；
(2) described cognitive nodes adopts terminal and base station, frequency that each described shared resource group of described terminal perception comprises also judges the frequency that can use, and whether described base station can with confirming available frequency, according to whether each described frequency confirmed with calculating the usable levels of each described shared resource group and can judge that the shared resource group that can use reports according to each described frequency of described terminal to report；
(3) described cognitive nodes adopts terminal and base station, frequency that each described shared resource group of described terminal perception comprises also judges the frequency that can use, whether described base station can be used according to each described frequency of described terminal to report on the one hand confirms available frequency, according to whether each described frequency confirmed with calculating the usable levels of each described shared resource group and can judge the shared resource group that can use, the another aspect frequency that directly each described shared resource group of perception comprises also judges the frequency that can use, according to whether each described frequency with calculating the usable levels of each described shared resource group and can judge the shared resource group that can use, described base station considers the usable levels of the available described shared resource group that two aspects obtain and finally judges that the shared resource group that can use reports.
8. frequency spectrum sharing method according to claim 7, it is characterised in that: according to the frequency range available threshold preset, described base station judges whether described shared resource group can be used；According to the frequency available threshold preset, described base station judges whether described frequency can be used.
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