CN106131854A - Base station and signaling method based on frequency spectrum perception technology - Google Patents

Abstract

An embodiment of the present invention provides a base station and a signal transmission method based on spectrum sensing technology. The method includes: when the base station arrives at each detection cycle, apply the spectrum sensing technology to measure the noise power ratio of uplink signals of all authorized frequency points in the cell; If the base station detects that the noise power ratio of N frequency points among the consecutive M frequency points is greater than the threshold, it broadcasts blocking information on the downlink channel of the M frequency points to indicate the transmission frequency point of the blocking information to the terminal The signal transmission is suspended; after that, the base station suspends the signal transmission of the M frequency points. By applying the present invention, the utilization rate of frequency spectrum resources of the industry wireless communication system can be improved, interference frequency bands can be avoided to ensure communication quality, and system reliability can be improved.

Description

Base station and signal transmission method based on spectrum sensing technology

technical field

The present invention relates to the field of radio technology, in particular to a base station and a signal sending method based on spectrum sensing technology.

Background technique

With the rapid development of wireless technology, mobile high-speed data networks, wireless multimedia applications and other wireless applications with high data rate requirements have been widely deployed, and the number of wireless users is growing explosively, which puts forward new requirements for wireless spectrum. As a country's scarce and non-renewable strategic resources, wireless spectrum resources are uniformly allocated by the relevant management departments of various countries, and all walks of life carry out business applications in the authorized spectrum. Once the spectrum resources are authorized and allocated, it indicates that the wireless resources available for the business are fixed. Facing the new demands of new services and new technologies for spectrum utilization and the challenges of a large number of users, how to use limited spectrum resources to meet the spectrum requirements of various wireless applications has become the current popular research topic.

At present, there are several power wireless communication systems in China. The communication protocols of traditional 230MHz digital transmission stations and Mobitex are simple, and it is difficult to guarantee the spectrum utilization rate; the communication protocols of WiMAX, McWill, and TD-LTE are perfect, but the network structure is complex and the The power consumption is high, and it is especially difficult to obtain a unified authorized frequency point, which is not suitable for large-scale and unified promotion of industrial wireless communication systems. In the allocation of existing wireless spectrum resources in China, the spectrum allocated to power users for load monitoring is 40 discrete frequency points within the 223MHz-235MHz frequency band, with a total bandwidth of 1MHz. The frequency point is used for business data transmission, so the channel environment for communication terminals in the electric power 230MHz frequency band is complex. There is not only adjacent channel interference from data transmission stations of other industry users, but also in-band interference from data transmission stations controlled by power users.

Therefore, it is necessary to further improve the utilization rate of spectrum resources in industrial wireless communication systems, avoid interference frequency bands, ensure communication quality, and improve system reliability.

Contents of the invention

In view of this, the present invention proposes a base station and its communication method based on spectrum sensing technology to improve the utilization rate of spectrum resources in industrial wireless communication systems, avoid interference frequency bands, ensure communication quality, and improve system reliability.

Based on the above purpose, the present invention provides a signal transmission method based on spectrum sensing technology, including:

When the base station arrives in each detection cycle, it applies spectrum sensing technology to measure the noise power of uplink signals at all authorized frequency points in the cell;

If the base station detects that the noise power of N frequency points in consecutive M frequency points is greater than the threshold, it broadcasts blocking information on the downlink channel of the M frequency points to indicate to the terminal that the transmission frequency point of the blocking information will Pause signal sending;

Afterwards, the base station suspends the signal transmission of the M frequency points;

Wherein, M is a natural number smaller than the number of all authorized frequency points, and N is a natural number smaller than M.

Further, after the base station suspends the signal transmission of the M frequency points, it also includes:

If the base station detects that the M frequency points meet the recovery condition, then resume the signal transmission of the M frequency points;

Wherein, the recovery condition is specifically that the noise power of R frequency points among the M frequency points is less than the threshold; the R is a natural number less than or equal to M and greater than M-N.

According to another aspect of the present invention, a base station is also provided, including:

The noise monitoring module is used to apply spectrum sensing technology to measure the noise power ratio of uplink signals of all authorized frequency points in the cell when each detection cycle arrives;

A blocking determination module, configured to determine the M frequency points as blocking frequency points if it is determined that the noise power ratios of N frequency points in consecutive M frequency points are greater than a threshold according to the detection result of the noise monitoring module;

The wireless resource scheduling module is used to broadcast blocking information on the downlink channel of the blocking frequency point, and is used to instruct the terminal that the transmission frequency point of the blocking information will suspend signal transmission; after that, suspend the signal transmission of the M frequency points.

Further, the blocking determination module is further configured to determine the M frequency points as normal frequency points if it is determined that the M frequency points meet the recovery condition according to the detection result of the noise monitoring module; and

The wireless resource scheduling module uses a normal frequency point for signal transmission;

Wherein, the recovery condition is specifically that the noise power of R frequency points among the M frequency points is less than the threshold; the R is a natural number less than or equal to M and greater than M-N.

In the technical solution of the present invention, the spectrum sensing technology is used to measure the noise power ratio of the uplink signals of all authorized frequency points in the cell, and the measured noise power ratio is compared with the set threshold, thereby identifying the available spectrum and the interfered spectrum; and then , if it is determined that the noise power ratio of N frequency points among the consecutive M frequency points is greater than the threshold value, then give up a group of air interface resources of M frequency points, and broadcast blocking information on the downlink channel that blocks the M frequency points; In order to avoid interference, minimize interference to other systems, and at the same time ensure the signal transmission quality of the system, improve system reliability, and improve the utilization rate of spectrum resources in industrial wireless communication systems.

Furthermore, when measuring the noise power ratio, the out-of-band interference power is mainly considered to clarify the interference of the out-of-band heterogeneous system on the in-band, so that the frequency points with large out-of-band interference can be blocked in a targeted manner, so as to avoid out-of-band interference If the signal sent by the internal system is interfered, it can also avoid signal interference to the out-of-band different system, so that wireless communication systems in different industries can avoid mutual interference and achieve harmonious coexistence.

Further, plan spectrum resources for the 223MHz-235MHz frequency range of the wireless communication system in the power industry, consider avoiding the third-order intermodulation effect between frequency points, plan some frequency points to be unavailable, and divide them into 3 clusters of frequency points, so that Make full use of spectrum resources while avoiding mutual interference between frequency points as much as possible.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a flowchart of a signal transmission method based on spectrum sensing technology according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of wireless frequency band interference avoidance in the electric power industry according to an embodiment of the present invention;

FIG. 3 is a spectrum comparison diagram before and after transmission of a 4-frequency point carrier aggregation power amplifier according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of subcarrier allocation of a downlink channel according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of subcarrier allocation of an uplink channel according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an internal structure of a base station according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. The expression "and/or" used herein includes all or any elements and all combinations of one or more associated listed items.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with their meaning in the context of the prior art, and unless specifically defined as herein, are not intended to be idealized or overly Formal meaning to explain.

Those skilled in the art can understand that the "terminal" and "terminal equipment" used here not only include wireless signal receiver equipment, which only has wireless signal receiver equipment without transmission capabilities, but also include receiving and transmitting hardware. A device having receive and transmit hardware capable of bi-directional communication over a bi-directional communication link. Such equipment may include: cellular or other communication equipment, which has a single-line display or a multi-line display or a cellular or other communication equipment without a multi-line display; PCS (Personal Communications Service, personal communication system), which can combine voice, data Processing, facsimile and/or data communication capabilities; PDA (Personal Digital Assistant, Personal Digital Assistant), which may include radio frequency receiver, pager, Internet/Intranet access, web browser, notepad, calendar and/or GPS (Global Positioning System (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "terminal", "terminal device" may be portable, transportable, installed in a vehicle (air, sea, and/or land), or adapted and/or configured to operate locally, and/or In distributed form, the operation operates at any other location on Earth and/or in space. The "terminal" and "terminal equipment" used here can also be communication terminals, Internet terminals, music/video playback terminals, such as PDAs, MIDs (Mobile Internet Devices, mobile Internet devices) and/or with music/video playback terminals. Functional mobile phones, smart TVs, set-top boxes and other devices.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

The inventors of the present invention consider that using the spectrum sensing technology of cognitive radio to effectively identify the available spectrum and the interfered spectrum at the licensed frequency point can maximize the use of spectrum resources and improve the utilization rate of spectrum resources; and on the basis of spectrum sensing On the one hand, avoid interference to ensure communication quality and improve system reliability.

Cognitive radio technology is a novel communication technology, which can effectively alleviate the problem of spectrum scarcity caused by existing shareholders' spectrum management methods, and is considered to be one of the most potential communication technologies in the next generation. As one of the key technologies of radio, spectrum sensing can detect spectrum holes in the surrounding space and provide usable spectrum for cognitive wireless users.

The inventor of the present invention applies the spectrum sensing technology to the industrial wireless communication system, and accordingly provides a signal sending method and base station based on the spectrum sensing technology. The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings.

The flow chart of the signal transmission method based on spectrum sensing technology provided by the present invention, as shown in Figure 1, includes the following steps:

S101: The base station measures the noise power ratio of uplink signals of all authorized frequency points in the cell by applying spectrum sensing technology when each detection cycle arrives;

Specifically, the base station periodically detects the noise power ratio of the uplink signal of each licensed frequency point; that is, within a detection period, the base station applies spectrum sensing technology to measure the noise power ratio of the uplink signal of each licensed frequency point in the cell.

In fact, the method of the present invention is mainly to avoid the interference of different systems within the band; therefore, when performing noise power ratio measurement, the noise of the out-of-band interference is mainly considered; therefore, preferably, when the base station arrives in each detection period, Calculate the bandwidth power value of each authorized frequency point, and then measure the out-of-band interference power of each authorized frequency point; for an authorized frequency point, the ratio of the out-of-band interference power of the frequency point to the bandwidth power value of the frequency point is taken as The measured noise power ratio of the uplink signal at this frequency point.

Calculating the noise power based on the out-of-band interference power can clarify the interference of different out-of-band systems on the in-band, so that the frequency points with large out-of-band interference can be blocked in a targeted manner, so as to avoid interference to the signal sent by the in-band system , It can also avoid signal interference to out-of-band heterogeneous systems.

For example, the electromagnetic environment in the 223MHz-235MHz frequency band of the electric power industry is complex. There is not only adjacent channel interference from high-power digital transmission stations in other industries, but also interference from the electric power industry’s own digital transmission stations, especially the digital transmission stations used for negative control monitoring in the electric power industry. The radio interference is serious, and the power wireless communication system needs to coexist harmoniously with the negative control digital radio, and interference avoidance needs to be performed on the basis of spectrum sensing.

S102: The base station detects whether the noise power of the uplink signal of each authorized frequency point exceeds a threshold;

Specifically, the base station compares the measured noise power ratios of the uplink signals of each licensed frequency point with a preset noise threshold, and uses the licensed frequency point whose noise power ratio exceeds the threshold as a candidate frequency point. In addition, it can also calculate the effective in-band power of the candidate frequency point; perform out-of-band blocking conversion on the candidate frequency point; perform peak interference processing on the candidate frequency point; set the frequency point with the smallest interference in the candidate frequency point set to be effective flag bit.

S103: If the base station detects that the noise power ratios of N frequency points among the consecutive M frequency points are greater than a threshold, broadcast blocking information on downlink channels of the M frequency points.

Specifically, if the base station determines that the number of candidate frequency points in the consecutive M frequency points is greater than or equal to N, that is, it judges that the noise power ratio of N frequency points in the consecutive M frequency points is greater than the threshold value, then at the M frequency points The downlink channel broadcasts the blocking information, which is used to indicate to the terminal that the transmission frequency point of the blocking information will suspend signal transmission.

When the base station senses the interference of other systems, it should avoid it immediately and let other systems transmit first. In order to minimize the interference to other systems, it can give up the air interface resources of a group of frequency points at a time. The base station can perceive whether the uplink channel is normal, and the terminal can perceive whether the downlink channel is normal. When the base station determines that the uplink channel interference is relatively large, and the noise power ratio of N frequency points in consecutive M frequency points is greater than the threshold, the The cells of the M frequency points are blocked, and the blocking information is broadcast on the downlink channels of the M frequency points.

Preferably, the smallest unit of blocking is M frequency points, that is, when N frequency points within M frequency points detect relatively large noise, the M frequency points are blocked; where M is less than all authorized The number of frequency points is a natural number, N is a natural number smaller than M, and M and N can be set by technical personnel according to the actual situation; for example, set M to 5 and N to 3.

When the base station detects uplink congestion, the downlink channel may still be available, and the base station can continue to use the downlink channel to broadcast cell congestion information on the blocked frequency, but does not start any services. The blocking signal is only sent once, and after sending, the entire blocked frequency point group does not send any signal (including reference signal, synchronization, broadcast). Fig. 2 shows a schematic diagram of wireless frequency band interference avoidance in the electric power industry.

Further, after the base station suspends the signal transmission of the M frequency points, if it detects that the M frequency points meet the recovery condition, then resumes the signal transmission of the M frequency points; wherein, the recovery condition is specifically the M frequency points The noise power of the R frequency points in is less than the threshold; the R is a natural number less than or equal to M and greater than M-N.

After recovering the transmission of the signals of the M frequency points, the terminal can perceive the uplink channel by itself, and after meeting the recovery conditions, directly send the uplink information on the M frequency points; or, the base station sends the recovery information notification on the downlink channels of the M frequency points The terminal, and the terminal sends uplink information on the M frequency points.

More preferably, in consideration of making full use of spectrum resources while avoiding mutual interference between frequency points as much as possible, it is necessary to study the planning of frequency points. In fact, when two or more interference signals that are relatively close to the frequency of the useful signal enter the front-end circuit of the receiver at the same time, a new frequency component may be generated under the action of a nonlinear circuit (such as high-frequency amplification, mixing, etc.) Falling into the IF passband of the receiver, causing interference to the receiver. The nonlinear circuit of the receiver can be regarded as a network, and the transfer function of this network can be expressed by the following power series:

H(s)＝A ₀ +A ₁ h(s)+A ₂ h ² (s)+A ₃ h ³ (s)+…+A _n h ⁿ (s)

Although the second, fourth, and sixth even power components in the transfer function can generate new frequency components, they will not fall into the passband of the useful signal and will not cause interference; only the third, fifth, and seventh odd power components can generate new frequency components. Lead to intermodulation interference, and are called third-order intermodulation, fifth-order intermodulation, seventh-order intermodulation, and so on. The higher the order, the smaller the amplitude of the interference signal generated, so the most influential is the third-order intermodulation interference. The logarithm of the ratio of the coefficient A3 of the cubic term in the transfer function to the coefficient A1 of the fundamental component is used to measure the ability of the network to resist third-order intermodulation interference, which is called "intermodulation response immunity". It is not difficult to see that the generation of intermodulation interference is determined by two factors: one is the existence of two input interference signals that have a certain frequency relationship with the useful signal; the other is the existence of nonlinear components in the transfer function. Figure 3 is a spectrum comparison diagram of a 4-frequency point carrier aggregation power amplifier before and after transmission. It can be seen that the output of the power amplifier brings serious out-of-band spurs without considering the influence of third-order intermodulation.

For the 40 discrete frequency points dedicated to the power system, considering that due to the influence of third-order intermodulation, some planned frequency points are not available, the present invention intends to analyze the impact of spurs according to the uplink and downlink classification of 3 clusters of frequency points, and finally determine the frequency points The parameters are as follows:

The bandwidth of each discrete frequency point is 25kHz, which is allocated with 10 subcarriers, and the bandwidth of each subcarrier is 2kHz;

The downlink frequency points are available in the following three groups:

The first group: distribute 15 frequency points in the 223.025-225MHz frequency band;

The second group: distribute 10 frequency points in the 228.025-230MHz frequency band;

The third group: distribute 15 frequency points in the 230.025-232MHz frequency band;

The sub-carrier allocation of the downlink channel is shown in Figure 4: one sub-carrier bandwidth is vacated between every 5 consecutive sub-carriers in the same frequency point; two sub-carrier bandwidths are vacated between an odd-numbered frequency point and subsequent adjacent even-numbered frequency points. The bandwidth of the carrier; the bandwidth of a subcarrier is vacated between the even frequency point and the subsequent adjacent odd frequency point.

Determine the available uplink frequency points into the following three groups:

The first group: distribute 15 frequency points in the 223.025-225MHz frequency band;

The second group: distribute 10 frequency points in the 228.025-230MHz frequency band;

The third group: distribute 15 frequency points in the 230.025-232MHz frequency band;

The subcarrier allocation of the uplink channel is shown in Figure 5: a frequency point includes 10 consecutive subcarriers; there is a bandwidth of 3 subcarriers between an even frequency point and subsequent adjacent odd frequency points; The bandwidth of two sub-carriers is vacant between adjacent even-numbered frequency points.

In the solution of the present invention, based on the signal transmission method based on the spectrum sensing technology provided above, the present invention also provides a block diagram of the internal structure of a smart base station, as shown in FIG. 6 , including: a noise monitoring module 601, a blocking judgment module 602, A radio resource scheduling module 603 .

The noise monitoring module 601 is used to apply spectrum sensing technology to measure the noise power ratio of uplink signals at all authorized frequency points in the cell when each detection period arrives; specifically, the noise monitoring module 601 applies the spectrum sensing technology when each detection period arrives. Sensing technology measures the out-of-band interference power of uplink signals of all authorized frequency points in the cell; for each authorized frequency point in the cell, the ratio of the measured out-of-band interference power of the frequency point to the bandwidth power of the frequency point is used as the frequency The noise power ratio of the uplink signal of the point.

Blocking judgment module 602 is used for according to the detection result of described noise monitoring module, if it is determined that the noise power ratio of N frequency points in consecutive M frequency points is greater than the threshold value, then determine the M frequency points as blocking frequency points; further The blocking determination module 602 further determines that the M frequency points are normal frequency points if it is subsequently determined that the M frequency points meet the recovery condition according to the detection result of the noise monitoring module.

The wireless resource scheduling module 603 is configured to broadcast blocking information on the downlink channel of the blocking frequency point, to instruct the terminal that the transmission frequency point of the blocking information will suspend signal transmission; after that, suspend signal transmission of the M frequency points; and , the radio resource scheduling module 603 uses normal frequency points and frequency points that are not determined as blocked frequency points to perform signal transmission.

For the specific function realization of each module of the above base station, reference may be made to the specific realization of each step in the signal transmission method based on the spectrum sensing technology mentioned above.

In the technical solution of the present invention, the spectrum sensing technology is used to measure the noise power ratio of the uplink signals of all authorized frequency points in the cell, and the measured noise power ratio is compared with the set threshold, thereby identifying the available spectrum and the interfered spectrum; and then , if it is determined that the noise power ratio of N frequency points among the consecutive M frequency points is greater than the threshold value, then give up a group of air interface resources of M frequency points, and broadcast blocking information on the downlink channel that blocks the M frequency points; In order to avoid interference, minimize interference to other systems, and at the same time ensure the signal transmission quality of the system, improve system reliability, and improve the utilization rate of spectrum resources in industrial wireless communication systems.

Furthermore, when measuring the noise power ratio, the out-of-band interference power is mainly considered to clarify the interference of the out-of-band heterogeneous system on the in-band, so that the frequency points with large out-of-band interference can be blocked in a targeted manner, so as to avoid out-of-band interference If the signal sent by the internal system is interfered, it can also avoid signal interference to the out-of-band different system, so that wireless communication systems in different industries can avoid mutual interference and achieve harmonious coexistence.

Further, plan spectrum resources for the 223MHz-235MHz frequency range of the wireless communication system in the power industry, consider avoiding the third-order intermodulation effect between frequency points, plan some frequency points to be unavailable, and divide them into 3 clusters of frequency points, so that Make full use of spectrum resources while avoiding mutual interference between frequency points as much as possible.

Those skilled in the art will appreciate that the present invention includes devices related to performing one or more of the operations described in this application. These devices may be specially designed and fabricated for the required purposes, or they may include known devices found in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program can be stored in a device (e.g., computer) readable medium, including but not limited to any type of medium suitable for storing electronic instructions and respectively coupled to a bus. Types of disks (including floppy disks, hard disks, CDs, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (eg, a computer).

Those skilled in the art will understand that computer program instructions can be used to implement each block in these structural diagrams and/or block diagrams and/or flow diagrams and combinations of blocks in these structural diagrams and/or block diagrams and/or flow diagrams . Those skilled in the art can understand that these computer program instructions can be provided to general-purpose computers, professional computers, or processors of other programmable data processing methods for implementation, so that the computer or processors of other programmable data processing methods can execute the present invention. A scheme specified in a block or blocks of a structure diagram and/or a block diagram and/or a flow diagram of the invention disclosure.

Those skilled in the art can understand that the various operations, methods, and steps, measures, and solutions in the processes discussed in the present invention can be replaced, changed, combined, or deleted. Furthermore, other steps, measures, and schemes in the various operations, methods, and processes that have been discussed in the present invention may also be replaced, changed, rearranged, decomposed, combined, or deleted. Further, steps, measures, and schemes in the prior art that have operations, methods, and processes disclosed in the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

The above descriptions are only part of the embodiments of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principles of the present invention. It should be regarded as the protection scope of the present invention.

Claims (10)

1. a signaling method based on frequency spectrum perception technology, it is characterised in that including:

Base station when each detection cycle arrives, the upward signal of all mandate frequencies in application frequency spectrum perception commercial measurement community Noise power ratio；

If the noise power ratio that described base station detects the N number of frequency in continuous N frequency is more than threshold value, then at this M frequency Down channel broadcasting blocks information, in order to indicate the transmission frequency that blocks information described in terminal to be sent by halt signal；

Afterwards, the signal transmission of this M frequency is suspended in described base station；

Wherein, M is the natural number less than all mandate frequency points, and N is the natural number less than M.

Method the most according to claim 1, it is characterised in that after the signal transmission of this M frequency is suspended in described base station, also Including:

If described base station detects that this M frequency reaches recovery condition, then the signal recovering this M frequency sends；

Wherein, the noise power of R frequency during described recovery condition is specially this M frequency is less than described threshold value；Described R is Less than or equal to M and the natural number more than M-N.

Method the most according to claim 1, it is characterised in that the upward signal of all mandate frequencies in described measurement community Noise power ratio, specifically include:

For mandate frequency each in community, base station is by the bandwidth power of the out-of-band interference power of this frequency measured with this frequency Ratio as the noise power ratio of the upward signal of this frequency.

4. according to the arbitrary described method of claim 1-3, it is characterised in that described mandate frequency includes 223-235MHz frequency range 40 interior discrete frequencies；And M is specially 5.

Method the most according to claim 4, it is characterised in that a width of 25KHz of band of each discrete frequency, is wherein assigned 10 subcarriers, a width of 2KHz of each sub-carrier bin；And

15 frequencies it are distributed in 223-225MHz frequency range；

10 frequencies it are distributed in 228-229MHz frequency range；

15 frequencies it are distributed in 230-232MHz frequency range；

The subcarrier of the down channel of described discrete frequency is assigned as: vacate between every 5 continuous print subcarriers in same frequency The bandwidth of one subcarrier；The bandwidth of two subcarriers is vacated between odd number frequency with follow-up adjacent even number frequency；Even number frequency Point and the bandwidth vacating a subcarrier between follow-up adjacent odd number frequency；

The subcarrier of the up channel of described discrete frequency is assigned as: a frequency includes 10 continuous print subcarriers；Even number The bandwidth of 3 subcarriers is vacated between frequency with follow-up adjacent odd number frequency；Odd number frequency and follow-up adjacent even number frequency Between vacate the bandwidth of two subcarriers.

6. a base station, it is characterised in that including:

Noise module, for when each detection cycle arrives, applies all mandates in frequency spectrum perception commercial measurement community The noise power ratio of the upward signal of frequency；

Block determination module, for according to the testing result of described noise module, however, it is determined that N number of in continuous N frequency The noise power ratio of frequency is more than threshold value, then be judged to this M frequency block frequency；

Wireless resource scheduling module, for the down channel broadcasting blocks information at described obstruction frequency, in order to indicate terminal institute Halt signal is sent by the transmission frequency stating obstruction information；Afterwards, the signal suspending this M frequency sends.

Base station the most according to claim 6, it is characterised in that

Described obstruction determination module is additionally operable to the testing result according to described noise module, however, it is determined that this M frequency reaches Recovery condition, then be judged to normal frequency by this M frequency；And

Described wireless resource scheduling module uses normal frequency to carry out signal transmission；

Wherein, the noise power of R frequency during described recovery condition is specially this M frequency is less than described threshold value；Described R is Less than or equal to M and the natural number more than M-N.

Base station the most according to claim 6, it is characterised in that

Described noise module, specifically for when each detection cycle arrives, applies institute in frequency spectrum perception commercial measurement community There is the out-of-band interference power of the upward signal authorizing frequency；For mandate frequency each in community, by the band of this frequency of measurement The ratio of the bandwidth power of outer jamming power and this frequency is as the noise power ratio of the upward signal of this frequency.

9. according to the arbitrary described base station of claim 6-8, it is characterised in that described mandate frequency includes 223-235MHz frequency range 40 interior discrete frequencies；And M is specially 5.

Base station the most according to claim 9, it is characterised in that a width of 25kHz of band of each discrete frequency, wherein distributes There are 10 subcarriers, a width of 2kHz of each sub-carrier bin；And

15 frequencies it are distributed in 223-225MHz frequency range；

10 frequencies it are distributed in 228-229MHz frequency range；

15 frequencies it are distributed in 230-232MHz frequency range；

The subcarrier of the down channel of described discrete frequency is assigned as: vacate between every 5 continuous print subcarriers in same frequency The bandwidth of one subcarrier；The bandwidth of two subcarriers is vacated between odd number frequency with follow-up adjacent even number frequency；Even number frequency Point and the bandwidth vacating a subcarrier between follow-up adjacent odd number frequency；

The subcarrier of the up channel of described discrete frequency is assigned as: a frequency includes 10 continuous print subcarriers；Even number The bandwidth of 3 subcarriers is vacated between frequency with follow-up adjacent odd number frequency；Odd number frequency and follow-up adjacent even number frequency Between vacate the bandwidth of two subcarriers.