CN111525969B - Spectrum sensing method, terminal and system based on white spectrum database - Google Patents
Spectrum sensing method, terminal and system based on white spectrum database Download PDFInfo
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- CN111525969B CN111525969B CN202010350358.2A CN202010350358A CN111525969B CN 111525969 B CN111525969 B CN 111525969B CN 202010350358 A CN202010350358 A CN 202010350358A CN 111525969 B CN111525969 B CN 111525969B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
Abstract
The invention discloses a spectrum sensing method, a terminal and a system based on a white spectrum database, wherein the method comprises the following steps: establishing an indoor television white spectrum database and an outdoor television white spectrum database; acquiring positioning information of a first cognitive radio device; inquiring a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information, and generating available channel information corresponding to the positioning information; and sending the available channel information to the first cognitive radio device. The invention accurately positions the user indoors or outdoors through the user positioning information such as the positioning coordinate and the environment information, thereby inquiring the corresponding indoor white spectrum database or the outdoor white spectrum database to obtain more effective available channel information and improving the efficiency and the accuracy of frequency spectrum detection.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of cognitive radio, in particular to a spectrum sensing method, a terminal and a system based on a white spectrum database.
[ background of the invention ]
In recent years, the worldwide unlimited communication service has been rapidly increased, which makes the spectrum resources available for wireless communication more and more scarce, and the problem of insufficient spectrum resources is more and more serious. How to utilize the existing spectrum resources to the maximum extent under the condition of limited wireless spectrum resources, and improving the spectrum utilization rate becomes the problem to be solved urgently at present. According to a part of survey reports, the utilization rate of VHF and UHF authorized bands originally used for television broadcasting is low and is often idle, and the part of broadcast television bands which are idle in certain geographic positions and certain time is called broadcast television white spectrum (hereinafter referred to as white spectrum), and specifically includes spectrum which is not allocated by a manager, spectrum which is allocated but not used or not fully used, and guard bands between adjacent channels, and the like. When using white spectrum for communication, the problem of spectrum acquisition, that is, acquiring available channels at a target time and a target location, needs to be solved first. White spectrum databases are one of spectrum acquisition methods. The white spectrum database stores some static information of the TV station, including the position of the TV station, the arrangement of the TV station, the transmitting power and the like, the service area of the white spectrum database is divided into a plurality of grids, each grid stores an available channel list, after the geographical position of the cognitive radio terminal is obtained, the geographical position corresponds to the grid of the database, and therefore the available channel list corresponding to the grid is issued to be selected by the cognitive radio equipment. The white spectrum database in the prior art is usually established based on outdoor conditions, so natural obstacles such as mountains and the like are usually considered, but in reality, people mostly move indoors, most of the requirements for wireless spectrum come from indoors, because the number of indoor obstacles such as walls is obviously larger than that of outdoor conditions, the signal attenuation in the indoor is very fast, and the influence of indoor complex environment, the indoor white spectrum distribution condition and the outdoor environment have great difference, if the outdoor white spectrum database is used for indoor cognitive radio equipment sensing, a great amount of white spectrum is lost, and the spectrum utilization rate is reduced.
[ summary of the invention ]
The invention provides a spectrum sensing method, a terminal and a system based on a white spectrum database, and solves the technical problems of loss of white spectrum and low spectrum utilization rate.
The technical scheme for solving the technical problems is as follows: a spectrum sensing method based on a white spectrum database comprises the following steps:
step 1, establishing an indoor television white spectrum database and an outdoor television white spectrum database;
step 2, acquiring positioning information of the first cognitive radio equipment;
step 3, inquiring a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information, and generating available channel information corresponding to the positioning information;
and 4, sending the available channel information to the first cognitive radio equipment.
In a preferred embodiment, the positioning information comprises current geographic coordinates, positioning accuracy, movement speed, movement direction and environment information of the cognitive radio device; the available channel information includes an available channel list, a maximum transmission power, and a channel validity period.
In a preferred embodiment, the querying the corresponding indoor tv white spectrum database and/or outdoor tv white spectrum database according to the positioning information includes the following steps:
step 301, judging whether the current position of the cognitive radio device is indoor or outdoor according to the current geographic coordinate, the positioning precision and the environmental information of the first cognitive radio device;
step S302, when the current position of the cognitive radio equipment is indoors, the corresponding indoor television white spectrum database is inquired to generate available channel information, and when the current position of the cognitive radio equipment is outdoors, the corresponding outdoor television white spectrum database is inquired to generate available channel information.
In a preferred embodiment, said querying the corresponding indoor tv white spectrum database and/or outdoor tv white spectrum database according to the positioning information further comprises the following steps
Step 303, calculating an expected movement range of the cognitive radio device according to the movement speed and the movement direction of the first cognitive radio device;
step 304, calculating a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected movement range of the first cognitive radio device;
step 305, querying the indoor television white spectrum database to obtain the available channel information of the cognitive radio device at the first expected time and/or querying the outdoor television white spectrum database to obtain the available channel information of the first cognitive radio device at the second expected time.
In a preferred embodiment, the method further comprises a switching step, wherein the switching step specifically comprises:
s601, judging whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received by the first cognitive radio equipment within preset time, if so, finishing the switching step, and if not, executing the step S602;
s602, inquiring whether any second cognitive radio equipment accessed to an indoor television white spectrum database and/or an outdoor television white spectrum database exists in a preset geographic range, if not, finishing the switching step, executing the step 2, and if so, executing the step S603;
s603, after the communication with the second cognitive radio equipment is established, the positioning information is sent to an indoor television white spectrum database and/or an outdoor television white spectrum database through the second cognitive radio equipment, and corresponding available channel information is received through the second cognitive radio equipment.
In a preferred embodiment, the connection is established with the second cognitive radio device by a near field wireless communication method including any one or more of wifi, uwb, bluetooth, nfc, and ZigBee.
A second aspect of the embodiments of the present invention provides a spectrum sensing terminal based on a white spectrum database, including an establishing module, an obtaining module, a first querying module and a sending module,
the building module is used for building an indoor television white spectrum database and an outdoor television white spectrum database;
the acquisition module is used for acquiring positioning information of the first cognitive radio equipment;
the first query module is used for querying a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information and generating available channel information corresponding to the positioning information;
the sending module is used for sending the available channel information to the first cognitive radio equipment.
In a preferred embodiment, the positioning information comprises current geographic coordinates, positioning accuracy, movement speed, movement direction and environment information of the cognitive radio device; the available channel information includes an available channel list, a maximum transmission power, and a channel validity period.
In a preferred embodiment, the first query module comprises:
the judging unit is used for judging whether the current position of the cognitive radio equipment is indoors or outdoors according to the current geographic coordinate, the positioning precision and the environmental information of the first cognitive radio equipment;
the first query unit is used for querying a corresponding indoor television white spectrum database to generate available channel information when the current position of the cognitive radio equipment is indoors, and querying a corresponding outdoor television white spectrum database to generate available channel information when the current position of the cognitive radio equipment is outdoors;
a first calculation unit for calculating an expected movement range of a first cognitive radio device according to a movement speed and a movement direction of the cognitive radio device;
a second calculation unit, configured to calculate a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected movement range of the first cognitive radio device;
and the second query unit is used for querying the indoor television white spectrum database, acquiring available channel information of the cognitive radio equipment at a first expected time and/or querying the outdoor television white spectrum database, and acquiring available channel information of the first cognitive radio equipment at a second expected time. A third aspect of the embodiments of the present invention provides a spectrum sensing terminal based on a white spectrum database, including the computer-readable storage medium and a processor, where the processor implements the steps of the spectrum sensing method based on the white spectrum database when executing a computer program on the computer-readable storage medium.
The third aspect of the embodiment of the present invention provides a spectrum sensing system based on a white spectrum database, which includes the above spectrum sensing terminal based on the white spectrum database, and further includes a first cognitive radio device, where the first cognitive radio device includes a determining module, a second querying module, and a control module,
the judging module is used for judging whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received within preset time, if so, the switching step is ended, and if not, a second query module is driven;
the second query module is used for querying whether any second cognitive radio equipment accessed to the indoor television white spectrum database and/or the outdoor television white spectrum database exists in a preset geographic range, if not, the switching step is ended, and if yes, the control module is driven;
and the control module is used for sending the positioning information to an indoor television white spectrum database and/or an outdoor television white spectrum database through the second cognitive radio equipment after communication is established with the second cognitive radio equipment, and receiving corresponding available channel information through the second cognitive radio equipment.
The invention provides a spectrum sensing method, a terminal and a system based on a white spectrum database, which are used for accurately positioning a user indoors or outdoors through user positioning information such as positioning coordinates and environment information so as to query the corresponding indoor white spectrum database or outdoor white spectrum database to obtain more effective available channel information and improve the efficiency and accuracy of spectrum detection.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a spectrum sensing method based on a white spectrum database provided in embodiment 1;
fig. 2 is a schematic structural diagram of a spectrum sensing terminal based on a white spectrum database provided in embodiment 2;
fig. 3 is a schematic structural diagram of a spectrum sensing system based on a white spectrum database provided in embodiment 3.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic flowchart of a spectrum sensing method based on a white spectrum database provided in embodiment 1, and as shown in fig. 1, the method includes the following steps:
step 1, establishing an indoor television white spectrum database and an outdoor television white spectrum database. In the prior art, there are various methods for establishing an indoor tv white spectrum database and an outdoor tv white spectrum database, for example, a system WISER for detecting an indoor white spectrum may be used for detection, specifically, a small number of scanners are arranged at an indoor target location, and then, a white spectrum distribution condition of the whole indoor is obtained through correlation recovery of tv channels at different locations.
And 2, acquiring positioning information of the first cognitive radio equipment, wherein the positioning information comprises the current geographic coordinate, the positioning precision, the movement speed, the movement direction and the environment information of the cognitive radio equipment. The geographic coordinates are geographic location information obtained by the positioning capabilities of the cognitive radio device itself. The positioning accuracy refers to the absolute accuracy of the self positioning capability of the cognitive radio equipment, and describes the uncertainty of the position information of the cognitive radio equipment, and the available channel information obtained by inquiring the white spectrum database is related to the positioning accuracy. And the environment information can be environment image information, light information, weather information, temperature and humidity information and the like, so that the first cognitive radio equipment can be judged to be indoors or outdoors by combining with the current geographic coordinates and the positioning accuracy.
And 3, inquiring a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information, and generating available channel information corresponding to the positioning information, wherein the available channel information comprises an available channel list, maximum transmitting power and a channel validity period. The available channels are available channels for use in the geographical location of the cognitive radio device. The maximum transmitting power refers to the maximum power which can be transmitted by the cognitive radio equipment under the normal working condition that a master user is not interfered and is calculated by a white frequency spectrum database; the channel validity period refers to the available channel transmitted by the white spectrum database to the cognitive radio device and the validity period of the corresponding maximum emissivity, and after the available channel is exceeded, the cognitive radio device needs to be accessed into the white spectrum database again to obtain information. In a preferred embodiment, querying the corresponding indoor television white spectrum database and/or outdoor television white spectrum database comprises the steps of:
step 301, judging whether the current position of the cognitive radio device is indoor or outdoor according to the current geographic coordinate, the positioning precision and the environmental information of the first cognitive radio device;
step S302, when the current position of the cognitive radio equipment is indoors, the corresponding indoor television white spectrum database is inquired to generate available channel information, and when the current position of the cognitive radio equipment is outdoors, the corresponding outdoor television white spectrum database is inquired to generate available channel information. In another preferred embodiment, the query process further includes the following steps
Step 303, calculating an expected movement range of the cognitive radio device according to the movement speed and the movement direction of the first cognitive radio device;
step 304, calculating a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected movement range of the first cognitive radio device;
and 305, querying an indoor television white spectrum database to acquire available channel information of the cognitive radio device at a first expected time and/or querying an outdoor television white spectrum database to acquire available channel information of the first cognitive radio device at a second expected time. The preferred embodiment further improves the spectrum sensing efficiency and improves the utilization rate of the idle spectrum by predicting the expected movement range of the cognitive radio terminal.
And then executing step 4, and sending the available channel information to the first cognitive radio device.
In a preferred embodiment, the spectrum sensing method based on the white spectrum database further includes a switching step, and the switching step specifically includes:
s601, judging whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received by the first cognitive radio equipment within preset time, if so, finishing the switching step, and if not, executing the step S602;
s602, inquiring whether any second cognitive radio equipment accessed to an indoor television white spectrum database and/or an outdoor television white spectrum database exists in a preset geographic range, if not, finishing the switching step, executing the step 2, and if so, executing the step S603;
s603, after communication is established with second cognitive radio equipment through a near field wireless communication method, the positioning information is sent to an indoor television white spectrum database and/or an outdoor television white spectrum database through the second cognitive radio equipment, and corresponding available channel information is received through the second cognitive radio equipment, wherein the near field wireless communication method comprises any one or more of wifi, uwb, Bluetooth, nfc and ZigBee.
The embodiment provides a spectrum sensing method based on a white spectrum database, which is used for accurately positioning a user indoors or outdoors through user positioning information such as positioning coordinates and environment information, so that a corresponding indoor white spectrum database or an outdoor white spectrum database is queried to obtain more effective available channel information, and the efficiency and accuracy of spectrum detection are improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 2 is a schematic structural diagram of a spectrum sensing terminal based on a white spectrum database according to embodiment 2, as shown in fig. 2, including a building module 100, an obtaining module 200, a first querying module 300 and a sending module 400,
the establishing module 100 is used for establishing an indoor television white spectrum database and an outdoor television white spectrum database;
the obtaining module 200 is configured to obtain positioning information of a first cognitive radio device;
the first query module 300 is configured to query a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information, and generate available channel information corresponding to the positioning information;
the sending module 400 is configured to send the available channel information to the first cognitive radio device.
In a preferred embodiment, the positioning information comprises current geographic coordinates, positioning accuracy, movement speed, movement direction and environment information of the cognitive radio device; the available channel information includes an available channel list, a maximum transmission power, and a channel validity period.
In a preferred embodiment, the first query module 300 includes:
a judging unit 301, configured to judge, according to the current geographic coordinate, the positioning accuracy, and the environment information of the first cognitive radio device, that the current location of the cognitive radio device is indoors or outdoors;
a first query unit 302, configured to query a corresponding indoor television white spectrum database to generate available channel information when the current location of the cognitive radio device is indoors, and query a corresponding outdoor television white spectrum database to generate available channel information when the current location of the cognitive radio device is outdoors;
a first calculation unit 303, configured to calculate an expected movement range of the cognitive radio device according to the movement speed and the movement direction of the first cognitive radio device;
a second calculation unit 304 for calculating a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected range of motion of the first cognitive radio device;
a second query unit 305, configured to query the indoor tv white spectrum database to obtain available channel information of the cognitive radio device at the first expected time and/or query the outdoor tv white spectrum database to obtain available channel information of the first cognitive radio device at the second expected time. A third aspect of the embodiments of the present invention provides a spectrum sensing terminal based on a white spectrum database, including a computer-readable storage medium and a processor, where the processor implements the steps of the above spectrum sensing method based on the white spectrum database when executing a computer program on the computer-readable storage medium.
The embodiment of the invention also provides a spectrum sensing system based on a white spectrum database, which comprises the spectrum sensing terminal based on the white spectrum database and a first cognitive radio device, wherein the first cognitive radio device comprises a judging module 500, a second inquiring module 600 and a control module 700,
the judging module 500 is configured to judge whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received within a preset time, if so, terminate the transferring step, and if not, drive the second querying module 600;
the second query module 600 is configured to query whether any second cognitive radio device connected to the indoor tv white spectrum database and/or the outdoor tv white spectrum database exists within a preset geographic range, if not, terminate the transfer step, and if so, drive the control module 700;
the control module 700 is configured to, after establishing communication with the second cognitive radio device, send the positioning information to the indoor tv white spectrum database and/or the outdoor tv white spectrum database via the second cognitive radio device, and receive corresponding available channel information via the second cognitive radio device.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (7)
1. A spectrum sensing method based on a white spectrum database is characterized by comprising the following steps:
step 1, establishing an indoor television white spectrum database and an outdoor television white spectrum database;
step 2, acquiring positioning information of the first cognitive radio equipment;
step 3, inquiring a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information, and generating available channel information corresponding to the positioning information;
step 4, the available channel information is sent to a first cognitive radio device;
in step 3, the querying the corresponding indoor television white spectrum database and/or outdoor television white spectrum database according to the positioning information includes the following steps:
step 301, judging whether the current position of the cognitive radio device is indoor or outdoor according to the current geographic coordinate, the positioning precision and the environmental information of the first cognitive radio device;
step S302, when the current position of the cognitive radio equipment is indoors, a corresponding indoor television white spectrum database is inquired to generate available channel information, and when the current position of the cognitive radio equipment is outdoors, a corresponding outdoor television white spectrum database is inquired to generate available channel information;
step 303, calculating an expected movement range of the cognitive radio device according to the movement speed and the movement direction of the first cognitive radio device;
step 304, calculating a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected movement range of the first cognitive radio device;
step 305, querying the indoor television white spectrum database to obtain the available channel information of the cognitive radio device at the first expected time and/or querying the outdoor television white spectrum database to obtain the available channel information of the first cognitive radio device at the second expected time.
2. The spectrum sensing method based on the white spectrum database according to claim 1, wherein the positioning information comprises current geographic coordinates, positioning accuracy, moving speed, moving direction and environment information of the cognitive radio device; the available channel information includes an available channel list, a maximum transmission power, and a channel validity period.
3. The spectrum sensing method based on the white spectrum database according to claim 1 or 2, further comprising a switching step, wherein the switching step specifically comprises:
s601, judging whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received by the first cognitive radio equipment within preset time, if so, finishing the switching step, and if not, executing the step S602;
s602, inquiring whether any second cognitive radio equipment accessed to an indoor television white spectrum database and/or an outdoor television white spectrum database exists in a preset geographic range, if not, finishing the switching step, executing the step 2, and if so, executing the step S603;
s603, after the communication with the second cognitive radio equipment is established, the positioning information is sent to an indoor television white spectrum database and/or an outdoor television white spectrum database through the second cognitive radio equipment, and corresponding available channel information is received through the second cognitive radio equipment.
4. The white-spectrum-database-based spectrum sensing method according to claim 3, wherein connection is established with the second cognitive radio device through a near-field wireless communication method, wherein the near-field wireless communication method comprises any one or more of wifi, uwb, Bluetooth, nfc, and ZigBee.
5. A spectrum sensing terminal based on a white spectrum database is characterized by comprising an establishing module, an obtaining module, a first query module and a sending module,
the building module is used for building an indoor television white spectrum database and an outdoor television white spectrum database;
the acquisition module is used for acquiring positioning information of the first cognitive radio equipment;
the first query module is used for querying a corresponding indoor television white spectrum database and/or an outdoor television white spectrum database according to the positioning information and generating available channel information corresponding to the positioning information;
the sending module is used for sending the available channel information to a first cognitive radio device;
the first query module comprises:
the judging unit is used for judging whether the current position of the cognitive radio equipment is indoors or outdoors according to the current geographic coordinate, the positioning precision and the environmental information of the first cognitive radio equipment;
the first query unit is used for querying a corresponding indoor television white spectrum database to generate available channel information when the current position of the cognitive radio equipment is indoors, and querying a corresponding outdoor television white spectrum database to generate available channel information when the current position of the cognitive radio equipment is outdoors;
a first calculation unit for calculating an expected movement range of a first cognitive radio device according to a movement speed and a movement direction of the cognitive radio device;
a second calculation unit, configured to calculate a first expected time when the cognitive radio device is indoors and/or a second expected time when the cognitive radio device is outdoors according to the current position and the expected movement range of the first cognitive radio device;
and the second query unit is used for querying the indoor television white spectrum database, acquiring available channel information of the cognitive radio equipment at a first expected time and/or querying the outdoor television white spectrum database, and acquiring available channel information of the first cognitive radio equipment at a second expected time.
6. The spectrum sensing terminal based on the white spectrum database according to claim 5, wherein the positioning information comprises current geographic coordinates, positioning accuracy, moving speed, moving direction and environment information of the cognitive radio device; the available channel information includes an available channel list, a maximum transmission power, and a channel validity period.
7. A spectrum sensing system based on a white spectrum database, comprising the spectrum sensing terminal based on the white spectrum database of claim 5 or 6, characterized by further comprising a first cognitive radio device, wherein the first cognitive radio device comprises a judging module, a second query module and a control module,
the judging module is used for judging whether available channel information sent by an indoor television white spectrum database and/or an outdoor television white spectrum database is received within preset time, if so, the switching step is ended, and if not, a second query module is driven;
the second query module is used for querying whether any second cognitive radio equipment accessed to the indoor television white spectrum database and/or the outdoor television white spectrum database exists in a preset geographic range, if not, the switching step is ended, and if yes, the control module is driven;
and the control module is used for sending the positioning information to an indoor television white spectrum database and/or an outdoor television white spectrum database through the second cognitive radio equipment after communication is established with the second cognitive radio equipment, and receiving corresponding available channel information through the second cognitive radio equipment.
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