CN104219686B - A kind of frequency spectrum sensing method and equipment - Google Patents

A kind of frequency spectrum sensing method and equipment Download PDF

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CN104219686B
CN104219686B CN201310213741.3A CN201310213741A CN104219686B CN 104219686 B CN104219686 B CN 104219686B CN 201310213741 A CN201310213741 A CN 201310213741A CN 104219686 B CN104219686 B CN 104219686B
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resource
silent
cognitive radio
radio system
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CN104219686A (en
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蒋成钢
杨宇
李媛媛
白文岭
胡金玲
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses a kind of frequency spectrum sensing method and equipment, this method includes：Network side equipment determines that cognitive radio system needs silent frequency resource and time resource；The network side equipment generates the silent pattern of cell using the frequency resource and time resource；The network side equipment utilizes the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern；And/or the silent pattern is sent to the terminal device in the cell by the network side equipment, and the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern is utilized by the terminal device.In the embodiment of the present invention, it can reduce with influence of the interior frequency spectrum perception to cognitive radio system handling capacity, to improve throughput of system, and improve the frequency spectrum service efficiency of cognitive radio system；In addition, the interruption of communication link will not be brought due to execution frequency spectrum perception, so as to reduce due to propagation delay time caused by frequency spectrum perception.

Description

A kind of frequency spectrum sensing method and equipment
Technical field
The present invention relates to field of communication technology more particularly to a kind of frequency spectrum sensing method and equipment.
Background technology
With the fast development of mobile communication cause, growing broadband wireless communications demand and limited frequency spectrum resource Between contradiction become clear day by day, although in LTE（Long Term Evolution, long term evolution）System has used OFDM （Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing）、MIMO（Multiple-Input Multiple-Output, multiple-input and multiple-output）Etc. technologies improve the availability of frequency spectrum, but these can not fundamentally be solved The problem of certainly frequency spectrum resource is short.With the rapid development of mobile service, telecom operators will face severeer frequency spectrum resource The problem of short.On the other hand, the frequency spectrum use of some wireless communication systems is in the time and geographically almost idle, such as wide TV band is broadcast, since Digital Transmission greatly improves transmission capacity, as radio data system is from analogue transmission to number The development of word transmission, makes many radio and television frequency ranges be chronically at idle state, wastes valuable radio resource, and it is other very Multi wireless communication system is also proved to its frequency spectrum and is underutilized.
To solve the problems, such as that frequency spectrum resource is short, CR（Cognitive Radio, cognitive radio）Technology is extensive Concern.CR is intelligent wireless communication system, the idle resource of frequency range workable for obtaining current location by frequency spectrum perception, and energy Enough opportunistics use idle frequency range, so as to improve frequency spectrum service efficiency, alleviate the situation of frequency spectrum resource anxiety.CR can be perceived External environment, and using artificial intelligence technology from environment learning, by changing certain operating parameters in real time（As transimission power, Carrier frequency and modulation technique etc.）, change the wireless signal statistical property that the adaptation of its internal state receives, to reach following Purpose：（1）Any time, the highly reliable communication in any place；（2）Frequency spectrum resource is efficiently used.
In order to achieve the above objectives, CR completes cognitive process by recognizing ring, cognition ring schematic diagram as shown in Figure 1, Include the following steps：（1）Frequency spectrum perception；（2）Spectrum analysis；（3）Frequency spectrum decision.Wherein, frequency spectrum perception is by inputting RF （Radio Frequency, radio frequency）The analysis of pumping signal, completes the detection to idle frequency spectrum, and frequency spectrum perception is using certain Signal detection algorithm（Such as energy detection algorithm, matched filtering detection algorithm etc.）, whether there is signal to deposit in certain frequency range by detecting To judge whether the frequency spectrum is occupied, so as to complete the detection to idle frequency spectrum；Spectrum analysis is according to frequency spectrum perception result With the analysis to other wireless input signals, the estimation of channel state information and being expected for channel capacity are completed；Frequency spectrum decision is The idle frequency spectrum resource and result of spectrum analysis obtained according to frequency spectrum perception obtains the decision that last frequency spectrum uses, this decision Include the decision of frequency point, bandwidth, transmission power, modulation system etc..
Frequency spectrum perception is by detecting the detection to complete idle frequency spectrum resource by the binary signal of frequency band, when in some quilt Authoring system signal is detected on the frequency band of detection, then it is assumed that the frequency band is occupied；When on some detected frequency band Authoring system signal is not detected, then it is assumed that the frequency band is in the free time.Further, frequency spectrum perception needs periodically sense Know the frequency point of current cognitive system work, so as to monitor the working condition of the frequency point authoring system, while can also monitor inoperative The working condition of frequency point authoring system, to ensure certain spare frequency point for cognition system reserve.Wherein, work to CR systems frequency The frequency spectrum perception of point, commonly referred to as with interior frequency spectrum perception；To the frequency spectrum perception of CR system inoperative frequency points, commonly referred to as with outer frequency Spectrum perceives.As shown in Fig. 2, for the schematic diagram with interior frequency spectrum perception and out of band spectrum perception.
Under plurality of application scenes, the demand to frequency spectrum perception ability is able to detect faint authoring system letter Number, this requires frequency spectrum perception in low SNR（Signal to Noise Ratio, signal-to-noise ratio）High detection performance is obtained under environment.But It is that frequency spectrum perception in low snr environments is easily disturbed influence, if when performing with interior frequency spectrum perception, cognitive system still exists Work, then frequency spectrum perception will be interfered by serious this system, so as to largely reduce the accuracy of frequency spectrum perception, and most The performance of CR systems is influenced eventually.
Therefore, at present for needing to keep cognitive system silent with interior frequency spectrum perception, i.e., when performing with interior frequency spectrum perception, CR systems do not emit any signal over the whole width, keep radio listening silence；Within the time of the silence, the CR systems are perceived Whether working frequency points are resumed by other authoring systems；And within the non-silence time, CR transmits communication correlation in the frequency point Information, quiet period schematic diagram are as shown in Figure 3.
In the implementation of the present invention, inventor has found to have at least the following problems in the prior art：
Current frequency spectrum sensing method in order to avoid this system is to the interference with interior frequency spectrum perception, needs that CR systems is allowed to exist Some time keeps the radio listening silence of full bandwidth, and is carried out in the time with interior frequency spectrum perception；Due within the silent time Radio system is completely in silent status, it is impossible to any communication data is transmitted, so as to cause the waste of radio resource.Into One step, if perform frequency spectrum perception period it is shorter or it is each perform frequency spectrum perception duration it is longer, it is right The reduction of throughput of system is apparent.Further, since wireless radio transmission understands periodic interruptions, the delay of transmission may be brought It can increase.
Invention content
The embodiment of the present invention provides a kind of frequency spectrum sensing method and equipment, to improve the efficiency that frequency spectrum uses.
In order to achieve the above object, the embodiment of the present invention provides a kind of frequency spectrum sensing method, and this method includes：
Network side equipment determines that cognitive radio system needs silent frequency resource and time resource；
The network side equipment generates the silent pattern of cell using the frequency resource and time resource；
The network side equipment utilizes the received signal progress frequency spectrum sense on the corresponding resource location of the silence pattern Know；And/or the silent pattern is sent to the terminal device in the cell by the network side equipment, by the terminal device Utilize the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern.
The embodiment of the present invention provides a kind of frequency spectrum sensing method, and this method includes：
Terminal device receives the silent pattern of network side equipment notice；Wherein, the silent pattern is that the network side is set For after determining that cognitive radio system needs silent frequency resource and time resource, the frequency resource and time is utilized to provide Source generates and notifies to the silent pattern of the terminal device；
The terminal device utilizes the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern.
The embodiment of the present invention provides a kind of network side equipment, which includes：
Determining module, for determining that cognitive radio system needs silent frequency resource and time resource；
Generation module, for utilizing the silent pattern of the frequency resource and time resource generation cell；
First processing module, for utilizing the received signal progress frequency spectrum on the corresponding resource location of the silence pattern It perceives；And/or the silent pattern is sent to the terminal device in the cell, it is utilized by the terminal device described quiet Received signal carries out frequency spectrum perception on the corresponding resource location of silent pattern.
The embodiment of the present invention provides a kind of terminal device, which includes：
Receiving module, for receiving the silent pattern of network side equipment notice；Wherein, the silent pattern is the network Side apparatus after determining that cognitive radio system needs silent frequency resource and time resource, using the frequency resource and when Between resource generate and notify to the silent pattern of terminal device；
Frequency spectrum sensing module, for utilizing the received signal progress frequency spectrum on the corresponding resource location of the silence pattern It perceives.
Compared with prior art, the embodiment of the present invention has at least the following advantages：In the embodiment of the present invention, network side equipment By determining that cognitive radio system needs silent frequency resource and time resource, and utilizes the frequency resource and time resource The corresponding silent pattern of generation, and received signal carries out frequency spectrum perception on the corresponding resource location of silence pattern, so as to Cognitive radio system is avoided to keep the radio listening silence of full bandwidth in certain time so that cognitive radio system can be at this Between transmit communication data, the interruption of communication link will not be brought, and can reduce due to frequency spectrum sense due to performing frequency spectrum perception Know caused propagation delay time.Further, since avoid cognitive radio system certain time keep full bandwidth radio listening silence, It also is able to reduce the waste of radio resource, improves the frequency spectrum service efficiency of cognitive radio system.In addition, if perform frequency spectrum The period of perception it is shorter or it is each perform frequency spectrum perception duration it is longer, since cognitive radio system being avoided to exist Certain time keeps the radio listening silence of full bandwidth, additionally it is possible to reduce the shadow to cognitive radio system handling capacity with interior frequency spectrum perception It rings, to improve throughput of system.
Description of the drawings
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme of the present invention It is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field For logical technical staff, without creative efforts, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is cognition ring schematic diagram of the prior art；
Fig. 2 is the schematic diagram perceived in the prior art with interior frequency spectrum perception and out of band spectrum；
Fig. 3 is quiet period schematic diagram of the prior art；
Fig. 4 is a kind of frequency spectrum sensing method flow diagram that the embodiment of the present invention one provides；
Fig. 5 is the frequency spectrum perception schematic diagram of the working frequency points of cognitive radio system in the embodiment of the present invention one；
Fig. 6 is the schematic diagram of DTMB and CMMB power spectral densities in the embodiment of the present invention one；
Fig. 7 is the silent pattern schematic diagram in the embodiment of the present invention one；
Fig. 8 is the DTMB power spectral density schematic diagrames that double pilot signal is inserted into the embodiment of the present invention one；
Fig. 9 is the ATSC power spectrum density schematic diagrames that pilot signal is inserted into the embodiment of the present invention one；
Figure 10 is the silent pattern schematic diagram in the embodiment of the present invention one；
Figure 11 is PAL-D power spectrum densities schematic diagram in the embodiment of the present invention one；
Figure 12 is the silent pattern schematic diagram in the embodiment of the present invention one；
Figure 13 and Figure 14 is the process flow schematic diagram of the frequency spectrum perception in the embodiment of the present invention one；
Figure 15 be in the embodiment of the present invention one whether adjudicate the channel according to the sensing results in each channel available Schematic diagram；
Figure 16 is a kind of frequency spectrum sensing method flow diagram provided by Embodiment 2 of the present invention；
Figure 17 is a kind of structure diagram for network side equipment that the embodiment of the present invention three provides；
Figure 18 is a kind of structure diagram for terminal device that the embodiment of the present invention four provides.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described, is shown So, described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work, all Belong to the scope of protection of the invention.
Embodiment one
For problems of the prior art, the embodiment of the present invention one provides a kind of frequency spectrum sensing method, and this method is fitted For using the cognitive radio system of OFDM multi-access modes, including but not limited to TD-LTE（Time Division-Long Time Evolution, time-division long term evolution）System, LTE system, WiMAX（Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave connect）System etc., as shown in figure 4, the frequency spectrum sensing method includes the following steps：
Step 401, network side equipment（Such as base station equipment）Determine cognitive radio system need silent frequency resource and Time resource.Wherein, the method for determination of time resource can be configured according to demand.
In a kind of preferred embodiment of the embodiment of the present invention, it is quiet that network side equipment determines that cognitive radio system needs Silent frequency resource, specifically includes：When selection is performed with interior frequency spectrum perception, network side equipment is according to cognitive radio system The prior information of the corresponding authoring system of working frequency points（That is the working frequency points authoring system that may be present of cognitive radio system The prior information of signal）Determine that cognitive radio system needs silent frequency resource.
Frequency spectrum perception detects the working condition of authoring system in band of interest by signal detection, these frequencies interested The authoring system signal characteristic that takes is usually that can know in advance, the center frequency point that may be occupied including signal, signal Modulation system that bandwidth, signal use etc..To study more scenes：Cognitive radio system chance is empty using broadcasting service The scene of ideler frequency spectrum is illustrated, and frequency range that inland of China broadcasting service can occupy is discrete many from 526.5kHz to 806MHz Frequency range divides table according to television channel, and the television channel bandwidth of each standard is 8MHz, the i.e. bandwidth of TV signal about 8MHz, One TV signal occupies a channel.Further, signals below feature is currently found：The broadcast television signal of certain systems There is obvious characteristic on frequency domain, such as：DTMB（Digital Television Multimedia Broadcasting, number Television multimedia is broadcasted）Signal may be inserted into the higher double pilot signal of power, from frequency domain, the frequency of double pilot in frequency The power of rate position is apparently higher than the power of data portion acquisition frequency position；ATSC（Advanced Television Systems Committee, the Advanced Television Systems committee）Signal can also be inserted into pilot signal in frequency.In addition, from The angle of frequency spectrum perception, by detecting these pilot signals, it is possible to determine that the channel whether there is authoring system signal.
In the embodiment of the present invention, network side equipment is according to the corresponding authoring system of working frequency points of cognitive radio system Prior information determines that cognitive radio system needs silent frequency resource, specifically includes：
Situation one, when the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system（Treat Perceive authoring system signal that may be present on channel）Power spectral density when frequency domain distribution is uniform, for the frequency of the channel Spectrum perceives, and network side equipment determines that cognitive radio system needs silent frequency resource（That is frequency location）In channel to be perceived Inside it is uniformly distributed.In addition, cognitive radio system needs silent frequency bandwidth and time resource that can be matched according to demand It puts.
Situation two, when the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system（Treat Perceive authoring system signal that may be present on channel）Include in frequency domain more than specified power（It, can be with for representing high power It is set according to practical experience value）Signal（There is high power pilot signal in frequency domain）When, for the frequency spectrum perception of the channel, Network side equipment determines that cognitive radio system needs silent frequency resource（That is frequency location）Power is being specified more than this Frequency location（I.e. in high power pilot frequency locations）.In addition, cognitive radio system needs silent frequency bandwidth according to mandate system Unite signal high power pilot signal band width configuration, and cognitive radio system need silent time resource can according to demand into Row configuration.
Situation three, when the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system（Treat Perceive authoring system signal that may be present on channel）Power spectral density in specific frequency position integrated distribution（That is power spectrum Density is in certain frequency location integrated distributions）When, for the frequency spectrum perception of the channel, network side equipment determines cognitive radio system System needs silent frequency resource（That is frequency location）In the specific frequency position（That is the frequency location of power integrated distribution）.This Outside, cognitive radio system needs silent frequency bandwidth to be matched according to the frequency bandwidth of authoring system signal power integrated distribution It puts, and cognitive radio system needs silent time resource that can be configured according to demand.
Step 402, network side equipment generates the silent pattern of cell using frequency resource and time resource.Wherein, this is quiet Silent pattern is specifically including but not limited to：System-frame, subframe either OFDM symbol and subcarrier or t easet ofasubcarriers；Specifically , silent pattern specifically includes：Cognitive radio system needs silent system-frame resource, cognitive radio system to need silence Sub-frame resources either OFDM symbol resource and cognitive radio system need silent sub-carrier resources or subcarrier collection Joint source.
Step 401 and step 402 are described in detail below in conjunction with specific embodiment.
Under the present embodiment, the acquisition modes of authoring system signal characteristic information on each channel can pass through external world's input dynamic It obtains, the database of authoring system signal characteristic information on each channel is such as stored with by dynamic queries；In addition, for it is long when Between frequency spectrum use will not changed channel, can in a radio communications system be prestored on each channel by static mode Authoring system signal characteristic information.As shown in figure 5, the frequency spectrum perception schematic diagram of the working frequency points for cognitive radio system, with Lower combination Fig. 5 provides the power for having uniform power spectrum density distribution, high power pilot signal and concentration when authoring system signal Under spectrum density distribution situation, cognitive radio system needs the selection mode of silent frequency resource and time resource.
（1）When authoring system power spectrum density on frequency domain when being uniformly distributed, such as：It is not inserted into the DTMB letters of double pilot Number use OFDM modulation systems, the signal after shaping filter frequency domain occupy about 8MHz bandwidth；Alternatively, CMMB （China Mobile Multimedia Broadcasting, China Mobile Multimedia Broadcasting）Signal is modulated by OFDM Signal afterwards also occupies the bandwidth of about 8MHz；Above-mentioned both signals power spectral density on frequency domain is evenly distributed in about 8MHz In bandwidth, as shown in fig. 6, for DTMB and CMMB power spectral density schematic diagrames.
For the signal occupied channel of the above-mentioned type（8MHz bandwidth）Frequency spectrum perception when, the quiet period position of frequency domain is at this It is uniformly distributed in channel 8MHz bandwidth, and silent position can be configured, such as 1 according to demand, 2,4 etc..In addition, each frequency The bandwidth of rate quiet period can also be configured according to demand, such as：50kHz, 100kHz etc..In addition, quiet period time span, period Etc. can also be configured according to demand, for example silent time span is 2ms, 5ms etc., period 500ms, 1s etc..
It should be noted that the reasonable selection of above-mentioned parameter, is to ensure the accurate perception for channel occupancy. As shown in fig. 7, for silent pattern schematic diagram, in the silence pattern schematic diagram, quiet period is evenly distributed in frequency In 8MHz bandwidth, lasting 2ms in time.
（2）In order to realize synchronous, channel estimation, authoring system signal may be inserted into pilot signal, pilot tone letter in frequency Number power it is higher.Such as：DTMB signals can be inserted into double pilot signal in the transmitted signals, which is equivalent to data - the 16dB of power, i.e. two double pilot total power signals are the 1/40 of the entire frequency band data part powers of DTMB；But from power spectrum From the point of view of density, the position power that pilot tone occurs is significantly higher than data portion, and in frequency domain, double pilot signal is ± 3.78MHz's Spectral line；As shown in figure 8, the DTMB power spectrum density schematic diagrames to be inserted into double pilot signal.For another example：ATSC uses VSB （Vestigial Side Band, vestigial sideband）Then modulated signal can insert in the baseband signal -2.69MHz positions of generation Enter the pilot signal of a single-frequency, the low 11.3dB of mean power of the power ratio data portion of the pilot signal, i.e. pilot signal General power is probably 0.074 times of the entire frequency band data part powers of ATSC；But from the point of view of power spectral density, the position of pilot tone appearance Put that power is significantly higher than data portion, as shown in figure 9, the ATSC power spectrum density schematic diagrames to be inserted into pilot signal.
For the signal occupied channel of the above-mentioned type（6MHz 8MHz bandwidth）Frequency spectrum perception, the quiet period position of frequency domain It puts and needs be only present in the frequency location for pilot tone occur, the bandwidth of frequency quiet period can be configured according to demand, such as：10kHz, 50kHz, 100kHz etc.；Quiet period time span, period etc. can also be configured according to demand, for example silent time span is 2ms, 5ms etc., period 500ms, 1s etc..
It should be noted that the reasonable selection of above-mentioned parameter, is to ensure the accurate perception for channel occupancy. As shown in Figure 10, it is silent pattern schematic diagram, in the silence pattern schematic diagram, quiet period appears in that there are pilot tones in frequency The frequency location of position, in time lasting 2ms.
（3）In addition there is a kind of signal, power spectrum density concentrates on certain several frequency band in the bandwidth that it is occupied On width.Such as：PAL-D（Phase Alternating Line-Delay postpone phase-aoternation line system）TV signal uses mould Intend modulation, and its audio signal uses FM（Frequency Modulation, frequency modulation(PFM)）Modulation, centre frequency are believed with image Number centre frequency interval 6.5MHz, maximum frequency deviation 50kHz, signal bandwidth about 130kHz, and the power of picture signal then mainly collects In near baseband；In addition, the PAL-D signals by VSB modulation in a 8MHz channel, as shown in figure 11, are believed for PAL-D Power frequency spectrum density schematic diagram, two of which peak difference representative image signal and audio signal.
For the signal occupied channel of the above-mentioned type（8MHz bandwidth）Frequency spectrum perception, the quiet period position of frequency domain only needs It is present in the frequency location of signal power concentration（Frequency location existing for picture-and-sound signal is appeared in for PAL-D signals） On, and quiet period bandwidth is determined according to the frequency bandwidth that signal power is concentrated, such as：The frequency occurred for PAL-D audio signals Rate position, quiet period frequency bandwidth can select to be more than 130kHz；In addition, quiet period time span, period etc. can also bases Demand is configured, for example silent time span is 2ms, 5ms etc., period 500ms, 1s etc..
It should be noted that the reasonable selection of above-mentioned parameter, is to ensure the accurate perception for channel occupancy. As shown in figure 12, it is silent pattern schematic diagram, in the silence pattern schematic diagram, quiet period exists only in picture-and-sound signal Existing frequency location, in time lasting 2ms.
Step 403, network side equipment is utilized in the corresponding resource location of silent pattern（That is the corresponding uplink money of silence pattern Source position）Upper received signal carries out frequency spectrum perception；And/or silent pattern is sent in respective cell by network side equipment Terminal device is utilized by the terminal device in the corresponding resource location of silent pattern（That is the corresponding downlink resource position of silence pattern It puts）Upper received signal carries out frequency spectrum perception.
In the preferred embodiment of the embodiment of the present invention, network side equipment is utilized on the corresponding resource location of silent pattern Received signal carries out frequency spectrum perception, is specifically including but not limited to following situation：
Situation one, network side equipment are needed in cognitive radio system in silent sub-frame resources or OFDM symbol resource Signal is received, based on existing communications link signals and data handling procedure, network side equipment selection cognitive radio system needs The silent corresponding frequency location of sub-carrier resources or the FFT of the corresponding frequency location of t easet ofasubcarriers resource（Fast Fourier Transformation, fast Fourier transform）Output signal, and letter is carried out to the FFT output signals of corresponding position Number detection process, obtains the whether occupied frequency spectrum perception result of channel to be perceived.
Situation two, network side equipment are needed in cognitive radio system in silent sub-frame resources or OFDM symbol resource Signal is received, based on narrow band filter, network side equipment needs silent sub-carrier resources corresponding cognitive radio system The signal of frequency location or the corresponding frequency location of t easet ofasubcarriers resource is filtered, and carries out letter to filtered signal Number detection process, obtains the whether occupied frequency spectrum perception result of channel to be perceived.
In addition, for multiaerial system, the reception signal on an antenna is can be used alone, and use the above situation one Or the processing procedure of situation two, to obtain the whether occupied frequency spectrum perception result of channel to be perceived；Alternatively, can also combine makes It is whether occupied as a result, as using the above situation one or situation two that channel to be perceived is obtained with the reception signal of mutiple antennas Processing procedure obtains the court verdict of each antenna, and then each antenna amalgamation result is merged using OR criterion, with To the whether occupied final result of channel to be perceived.
In the embodiment of the present invention, network side equipment using frequency resource and time resource generation cell silent pattern it Afterwards, which can also be sent to silent pattern on the terminal device in the cell, and network side is received by terminal device The silent pattern of this cell corresponding to the frequency resource and time resource of the cognitive radio system needs silence of equipment notice, And utilize the corresponding resource location of silence pattern（That is the corresponding downlink resource position of silence pattern）Upper received signal carries out Frequency spectrum perception.
In a preferred embodiment, network side equipment can utilize cognitive radio system to need silent frequency The index of the silent pattern of silent pattern generation corresponding to resource and time resource, and silent pattern is broadcasted by system message It indexes to the terminal device in affiliated subdistrict；Further, terminal device is obtained by monitoring the system message of this Cell Broadcast CB The index of the silent pattern of this cell, and determine the silent pattern corresponding to the index of silent pattern, i.e. cognitive radio system Silent system frame number, cognitive radio system is needed to need silent subframe number or OFDM symbol number and recognize Know that radio system needs silent subcarrier number or t easet ofasubcarriers number etc..
In the preferred embodiment of the embodiment of the present invention, terminal device is utilized and is connect on the corresponding resource location of silent pattern The signal of receipts carries out frequency spectrum perception, is specifically including but not limited to following situation：
Situation one, terminal device need to connect in silent sub-frame resources or OFDM symbol resource in cognitive radio system The collection of letters number, based on existing communications link signals and data handling procedure, terminal device selection cognitive radio system needs silence The corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource FFT output signals, it is and right The FFT output signals of corresponding position carry out signal detection processing, obtain the whether occupied frequency spectrum perception result of channel to be perceived.
Situation two, terminal device need to connect in silent sub-frame resources or OFDM symbol resource in cognitive radio system The collection of letters number, based on narrow band filter, terminal, which is set, needs cognitive radio system the silent corresponding frequency position of sub-carrier resources It puts or the signal of the corresponding frequency location of t easet ofasubcarriers resource is filtered, and signal detection is carried out to filtered signal Processing, obtains the whether occupied frequency spectrum perception result of channel to be perceived.
In addition, for multiaerial system, the reception signal on an antenna is can be used alone, and use the above situation one Or the processing procedure of situation two, to obtain the whether occupied frequency spectrum perception result of channel to be perceived；Alternatively, can also combine makes It is whether occupied as a result, as using the above situation one or situation two that channel to be perceived is obtained with the reception signal of mutiple antennas Processing procedure obtains the court verdict of each antenna, and then each antenna amalgamation result is merged using OR criterion, with To the whether occupied final result of channel to be perceived.
The corresponding money of silent pattern is utilized to above-mentioned network side equipment and/or terminal device below in conjunction with specific embodiment The process of received signal progress frequency spectrum perception is described in detail on source position.
Under the present embodiment, network side equipment and/or terminal device obtain silent pattern（I.e. cognitive radio system needs quiet Silent system-frame, cognitive radio system need silent subframe or OFDM symbol, cognitive radio system need it is silent Subcarrier or t easet ofasubcarriers）Later, the PRB in the sub-frame resources of corresponding system frame resource（Physical Resource Block, Physical Resource Block）Position（It is PRB resource informations, corresponding to the subcarrier or t easet ofasubcarriers for needing silence）Inspection Whether have the signal of authoring system, and the method detected can include but is not limited to following manner if surveying：
Mode one：For the system using OFDM multi-access modes, network side equipment and/or terminal device connect in progress signal In Base-Band Processing, frequency domain is transformed to by FFT transform by the time receiving for time-domain signal, to restore the signal of transmitting.Network side equipment And/or terminal device is obtaining the son that cognitive radio system needs silent system-frame, cognitive radio system needs silence After frame and corresponding PRB resource informations, signal is used for for the FFT output signals that there are the subframe of quiet period, corresponding PRB pair is answered Energy measuring may be used in detection, the method specifically detected, i.e.,：The mean power of the FFT output signals of direct statistical correlation, and By the mean power of statistics compared with decision threshold, obtain that signal whether there is as a result, process flow such as Figure 13 of its frequency spectrum perception It is shown.
Mode two：Network side equipment and/or terminal device are obtaining the silent system-frame of cognitive radio system needs, are recognizing After knowing radio system and needing silent subframe and corresponding PRB resource informations, for there are the subframe of the system-frame of quiet period, Signal for frequency spectrum perception is filtered out using a narrow band filter, the centre frequency and bandwidth of the wave filter are according to silence PRB location determinations, the time of wave filter work is by silent system-frame, subframe, OFDM symbol location determination.Further, it is right Signal detecting method may be used in the signal filtered out to detect whether there are authoring system signal, such as：Network side equipment and/ Or filtered signal and known signal can be carried out relevant treatment by terminal device, and by the maximum value of correlated results and judgement Thresholding compares, and obtains the result that signal whether there is；Alternatively, the power of the signal directly after statistical filtering, and by the power of statistics with Decision threshold compares, and obtains that signal whether there is as a result, the process flow of its frequency spectrum perception is as shown in figure 14.
In addition, when being handled, the PRB resource locations of multiple silences can also be used in combination, multiple subframe positions are more The reception signal of a antenna carries out frequency spectrum perception processing.A kind of processing mode is：It is adopted on each independent silent resource respectively It is perceived with above-mentioned frequency spectrum sensing method as a result, and independent silent resource is time-frequency sky（Corresponding subframe, PRB, antenna）It can The resource of resolution.Assuming that the sensing results on each independent silent resource are：Di can then be obtained by merging the result of multiple Di To final judging result；Such as：It sums to Di（I=1,2 ... N, N are N number of independent resource）And by the result after summation and certain door Limit compares, and obtains the whether occupied result of frequency spectrum.By the signal of the multiple silent resources of Combined Treatment, can obtain frequency, when Between, the gain of space diversity, and the robustness of perception can be effectively improved.
In the embodiment of the present invention, network side equipment and/or terminal device on the corresponding resource location of silent pattern using connecing After the signal of receipts carries out the process of frequency spectrum perception, whether network side equipment and/or terminal device can also occupied according to frequency spectrum Court verdict forms the conclusive judgement of the whether occupied situation of each channel, and specific judging process is：（1）If some frequency Quiet period subcarrier in road（Or t easet ofasubcarriers）The signal detecting result of resource location is occupied, then the channel is adjudicated It is occupied；If the quiet period subcarrier in some channel（Or t easet ofasubcarriers）The signal detecting result of resource location for not by It occupies, then the channel is judged as unoccupied；（2）If there are multiple quiet period subcarriers in some channel（Or subcarrier collection It closes）Resource location, then multi-section divide quiet period subcarrier（Or t easet ofasubcarriers）The signal detecting result of resource location to be occupied, Then the channel is judged as occupied；Otherwise, it is unoccupied to adjudicate.
Below in conjunction with specific embodiment to network side equipment and/or terminal device according to the whether occupied judgement of frequency spectrum As a result the process for forming the conclusive judgement of the whether occupied situation of each channel is described in detail.
It is as shown in figure 15, whether available to adjudicate the channel according to the sensing results in each channel under the present embodiment Schematic diagram.Such as：For the frequency band of a 8MHz, the silent position in a frequency is configured in the frequency band, then according to quiet at this Whether the signal detecting result on silent position, the 8MHz frequency bands where judging can be used.If the signal detection on the silence position As a result it is that there are authoring system signals, then the 8MHz frequency bands are unavailable；It, should if testing result is there is no authoring system signal 8MHz frequency bands can be used.In addition, if there are the frequency locations of multiple silences in channel, the above method may be used first to each frequency Court verdict on resource location is merged, and adjudicates whether channel can be used further according to fusion results.
In the embodiment of the present invention, network side equipment using frequency resource and time resource generation cell silent pattern it Afterwards, network side equipment is carrying out scheduling of resource（Ascending resource scheduling/scheduling downlink resource）When, network side equipment is in cognition wireless Electric system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources or OFDM symbol money Cognitive radio system on source needs not dispatch terminal device in silent sub-carrier resources or t easet ofasubcarriers resource； And/or network side equipment needs the cognitive radio system needs in silent system-frame resource quiet in cognitive radio system Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or subcarrier to silent sub-frame resources Do not emit signal in set resource.And/or after terminal device obtains silent pattern, terminal device is in cognitive radio system The cognitive radio system in silent system-frame resource is needed to need in silent sub-frame resources or OFDM symbol resource Cognitive radio system needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource.
In a kind of preferred embodiment of the embodiment of the present invention, network side equipment needs silence in cognitive radio system Cognitive radio system in system-frame resource needs the cognitive radio in silent sub-frame resources or OFDM symbol resource System needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource（Any signal）, specifically include but not It is limited to：
Situation one needs silent sub-frame resources or OFDM symbol resource, network side to set cognitive radio system It is standby to check that cognitive radio system needs silent sub-carrier resources or t easet ofasubcarriers resource and physical layer control channel（Such as LTE PUCCH（Physical Uplink Control Channel, Physical Uplink Control Channel））Occupy whether resource conflicts； If it is, network side equipment needs the cognitive radio system in silent system-frame resource to need in cognitive radio system Silent sub-frame resources, which do not emit in all sub-carrier resources in OFDM symbol resource or t easet ofasubcarriers resource either, appoints What signal；If it is not, then network side equipment only needs to need the cognition in silent system-frame resource in cognitive radio system Radio system needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource that silent son is needed to carry Any signal is not emitted in wave resource or t easet ofasubcarriers resource.
Situation two needs silent sub-frame resources or OFDM symbol resource, network side to set cognitive radio system There are corresponding communication systems in the standby sub-carrier resources silent in cognitive radio system needs or t easet ofasubcarriers resource Pilot tone（Pilot）When, then network side equipment needs the cognitive radio in silent system-frame resource in cognitive radio system System needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need silent sub-carrier resources Or the pilot tone is not emitted in t easet ofasubcarriers resource；Alternatively, for cognitive radio system need silent sub-frame resources or Person's OFDM symbol resource, network side equipment need silent sub-carrier resources or t easet ofasubcarriers money in cognitive radio system There are the reference signals of corresponding communication system in source（Reference Signal）When, then network side equipment is in cognitive radio system System needs the cognitive radio system in silent system-frame resource to need in silent sub-frame resources or OFDM symbol resource Cognitive radio system need not emitting the reference signal in silent sub-carrier resources or t easet ofasubcarriers resource.
Situation three, when there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, net Network side apparatus needs the cognitive radio system in silent system-frame resource in the corresponding cognitive radio system of each antenna port System need the cognitive radio system in silent sub-frame resources or OFDM symbol resource need silent sub-carrier resources or Any signal is not emitted in person's t easet ofasubcarriers resource.
In a kind of preferred embodiment of the embodiment of the present invention, terminal device is what cognitive radio system needed silence Cognitive radio system in frame resource of uniting needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource System needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource（Any signal）, specifically include but unlimited In：
Situation one needs silent sub-frame resources or OFDM symbol resource, terminal device for cognitive radio system Check that cognitive radio system needs silent sub-carrier resources or t easet ofasubcarriers resource and physical layer control channel（Such as LTE PUCCH（Physical Uplink Control Channel, Physical Uplink Control Channel））Occupy whether resource conflicts； If it is, terminal device needs the cognitive radio system needs in silent system-frame resource quiet in cognitive radio system Silent sub-frame resources do not emit in all sub-carrier resources in OFDM symbol resource or t easet ofasubcarriers resource either any Signal；If it is not, then terminal device only needs to need the cognition wireless in silent system-frame resource in cognitive radio system Electric system needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need silent subcarrier money Any signal is not emitted in source or t easet ofasubcarriers resource.
Situation two needs silent sub-frame resources or OFDM symbol resource, terminal device for cognitive radio system Leading there are corresponding communication system in silent sub-carrier resources or t easet ofasubcarriers resource is needed in cognitive radio system Frequently（Pilot）When, then terminal device needs the cognitive radio system in silent system-frame resource in cognitive radio system Need cognitive radio system of the silent sub-frame resources either in OFDM symbol resource need silent sub-carrier resources or The pilot tone is not emitted in t easet ofasubcarriers resource；Alternatively, for cognitive radio system need silent sub-frame resources or OFDM symbol resource, terminal device are needed in cognitive radio system in silent sub-carrier resources or t easet ofasubcarriers resource There are the reference signals of corresponding communication system（Reference Signal）When, then terminal device is needed in cognitive radio system Cognitive radio system in silent system-frame resource needs the cognition in silent sub-frame resources or OFDM symbol resource Radio system needs not emitting the reference signal in silent sub-carrier resources or t easet ofasubcarriers resource.
Situation three, when there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, eventually End equipment needs the cognitive radio system in silent system-frame resource in the corresponding cognitive radio system of each antenna port Need cognitive radio system of the silent sub-frame resources either in OFDM symbol resource need silent sub-carrier resources or Any signal is not emitted in t easet ofasubcarriers resource.
Silence is needed in cognitive radio system to network side equipment and/or terminal device below in conjunction with specific embodiment System-frame resource on cognitive radio system need cognition wireless in silent sub-frame resources or OFDM symbol resource Electric system needs the process for not emitting any signal in silent sub-carrier resources or t easet ofasubcarriers resource to carry out specifically It is bright.
Under the present embodiment, network side equipment is according to quiet period frequency resource and time resource, and the characteristics of combine this system, Generation is intended for the silent pattern of this system.Wherein, if having multiple cells under a network side equipment, the network side equipment The frequency resource and time resource respectively according to corresponding to each cell occupied channel are needed, generates the silent pattern of the cell. Wherein, for TD-LTE/LTE systems, above-mentioned silence pattern can specifically include：In which system-frame, which subframe which PRB resources are silent（In TD-LTE/LTE systems, PRB is made of continuous Nsy OFDM symbol and continuous Nsc sub- carrier waves Resource collection）.The index information of silent system frame number, subframe number and PRB numbers can be generated based on silent pattern, Such as：The of the system-frame of SFN mod SilencePeriod=SilenceFrameIndex SilencePRBIndex1 in SilenceSubFrameIndex1 and SilenceSubFrameIndex2 work song frames, SilencePRBIndex2 PRB resource locations are silent.
Network side equipment can also be by above-mentioned resource indexing information（The index information of i.e. silent pattern）Pass through the system of broadcast Message is sent to the terminal device in related cell, such as：Network side equipment is in SIB（System Information Block, System information block）Above-mentioned index position SilencePeriod, SilenceFrameIndex are added in message, SilenceSubFrameIndex1, SilenceSubFrameIndex2, SilencePRBIndex1, SilencePRBIndex2.Further, the terminal device of TD-LTE/LTE systems is disappeared by monitoring the system of the Cell Broadcast CB Breath obtains silent resource indexing information, and so as to understand the cell in which system-frame, which PRB resource of which subframe is quiet It is silent.
When carrying out downlink, network side equipment is in the corresponding subcarrier money of downlink subframe for needing silent system-frame Signal or transmitting zero energy signal are not emitted on source.For TD-LTE and LTE system, due to the preceding 2-3 OFDM of downlink subframe Region, other OFDM symbols are data area to symbol in order to control, need the PRB moneys of silent downlink subframe silence data part Source, and the resource of control area is unaffected；In addition, the reference signal in the PRB data areas of above-mentioned silent subframe does not emit. When carrying out uplink transmitting, terminal device does not emit letter in the corresponding PRB resources of sub-frame of uplink for needing silent system-frame Number or transmitting zero energy signal.For TD-LTE and LTE system, due to the PRB resources at sub-frame of uplink system bandwidth of operation edge For physical layer control channel occupied area, other PRB are data transmission region, may be with object so there is silent PRB resources The situation for the PRB resource contentions that layer control channel occupied area occupies is managed, needs to judge that silent PRB resources are before uplink transmitting It is no to conflict with control area occupancy PRB；It is completely silent in the sub-frame of uplink if there is conflict, do not emit in the subframe any Signal, including physical layer control signal, data-signal, pilot signal etc.；If there is no conflict, silent sub-frame of uplink is needed Corresponding PRB resources, not transmitted data signal and reference signal in the PRB resources.
Further, since some reference signals are periodical launchs, such as：Location pilot, upstream detection pilot frequency rate signal It all may be with tens of ms periodic emissions.In order to reduce the silent influence emitted for reference signal, in selection parameter SilencePeriod, SilenceFrameIndex, SilenceSubFrameIndex1, SilenceSubFrameIndex2 When, can avoiding selection as possible, there are the subframes that periodic reference signal emits.
In addition, for the system of multiple antennas, it is not considered each antenna port and different silent patterns, Ge Getian is configured Line is according to the method described above in relevant system-frame, subframe and PRB silences.
Embodiment two
The embodiment of the present invention two provides a kind of frequency spectrum sensing method, and this method is suitable for the cognition using OFDM multi-access modes Radio system includes but not limited to TD-LTE system, LTE system, WiMAX system etc., as shown in figure 16, the frequency spectrum perception Method includes the following steps：
Step 1601, terminal device receives the silent pattern of network side equipment notice.Wherein, which is network side Equipment is provided after determining that cognitive radio system needs silent frequency resource and time resource using the frequency resource and time Source generates and notifies to the silent pattern of terminal device.
In a kind of preferred embodiment of the embodiment of the present invention, when selection is performed with interior frequency spectrum perception, network side is set The prior information of the standby corresponding authoring system of working frequency points according to cognitive radio system determines cognitive radio system needs Silent frequency resource.Specifically, when the corresponding authoring system letter of the channel to be perceived of the working frequency points of cognitive radio system Number power spectral density when frequency domain distribution is uniform, for the frequency spectrum perception of the channel, network side equipment determines cognitive radio System needs silent frequency resource to be uniformly distributed in channel to be perceived；When the working frequency points of cognitive radio system are waited to feel The corresponding authoring system signal of channel is known when frequency domain includes the signal more than specified power, the frequency spectrum sense for the channel Know, network side equipment determines that cognitive radio system needs silent frequency resource in the frequency location that power is specified more than this； When the power spectral density of the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system is in specific frequency During the integrated distribution of rate position, for the frequency spectrum perception of the channel, network side equipment determines that cognitive radio system needs silence Frequency resource is in the specific frequency position.
In the embodiment of the present invention, terminal device receives the silent pattern of network side equipment notice, specifically includes：Terminal device The index of the silent pattern of this cell is obtained by the system message for monitoring this Cell Broadcast CB, and determines the index of the silence pattern Corresponding silent pattern.Wherein, which is specifically including but not limited to：System-frame, subframe or OFDM symbol and Subcarrier or t easet ofasubcarriers；Specifically, silent pattern specifically includes：Cognitive radio system needs silent system-frame money Source, cognitive radio system need silent sub-frame resources or OFDM symbol resource and cognitive radio system needs quiet Silent sub-carrier resources or t easet ofasubcarriers resource.
Step 1602, terminal device utilizes the received signal progress frequency spectrum sense on the corresponding resource location of silent pattern Know.
In the preferred embodiment of the embodiment of the present invention, terminal device is utilized and is connect on the corresponding resource location of silent pattern The signal of receipts carries out frequency spectrum perception, is specifically including but not limited to following situation：
Situation one, terminal device need to connect in silent sub-frame resources or OFDM symbol resource in cognitive radio system The collection of letters number, based on existing communications link signals and data handling procedure, terminal device selection cognitive radio system needs silence The corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource FFT output signals, it is and right The FFT output signals of corresponding position carry out signal detection processing, obtain the whether occupied frequency spectrum perception result of channel to be perceived.
Situation two, terminal device need to connect in silent sub-frame resources or OFDM symbol resource in cognitive radio system The collection of letters number, based on narrow band filter, terminal, which is set, needs cognitive radio system the silent corresponding frequency position of sub-carrier resources It puts or the signal of the corresponding frequency location of t easet ofasubcarriers resource is filtered, and signal detection is carried out to filtered signal Processing, obtains the whether occupied frequency spectrum perception result of channel to be perceived.
In addition, for multiaerial system, the reception signal on an antenna is can be used alone, and use the above situation one Or the processing procedure of situation two, to obtain the whether occupied frequency spectrum perception result of channel to be perceived；Alternatively, can also combine makes It is whether occupied as a result, as using the above situation one or situation two that channel to be perceived is obtained with the reception signal of mutiple antennas Processing procedure obtains the court verdict of each antenna, and then each antenna amalgamation result is merged using OR criterion, with To the whether occupied final result of channel to be perceived.
In the preferred embodiment of the embodiment of the present invention, after terminal device obtains silent pattern, terminal device is recognizing Radio system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources or OFDM symbols Cognitive radio system in number resource needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource.
In a kind of preferred embodiment of the embodiment of the present invention, terminal device is what cognitive radio system needed silence Cognitive radio system in frame resource of uniting needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource System needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource（Any signal）, specifically include but unlimited In：
Situation one needs silent sub-frame resources or OFDM symbol resource, terminal device for cognitive radio system Check that cognitive radio system needs silent sub-carrier resources or t easet ofasubcarriers resource and physical layer control channel（Such as LTE PUCCH）Occupy whether resource conflicts；If so, terminal device needs silent system-frame money in cognitive radio system Cognitive radio system on source need all sub-carrier resources of the silent sub-frame resources either in OFDM symbol resource or Any signal is not emitted in t easet ofasubcarriers resource；If not, terminal device only needs to need silence in cognitive radio system System-frame resource on cognitive radio system need cognition wireless in silent sub-frame resources or OFDM symbol resource Electric system needs not emitting any signal in silent sub-carrier resources or t easet ofasubcarriers resource.
Situation two needs silent sub-frame resources or OFDM symbol resource, terminal device for cognitive radio system Leading there are corresponding communication system in silent sub-carrier resources or t easet ofasubcarriers resource is needed in cognitive radio system During frequency, then terminal device needs the cognitive radio system in silent system-frame resource to need silence in cognitive radio system Sub-frame resources either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or subcarrier collection The pilot tone is not emitted on joint source；Alternatively, silent sub-frame resources or OFDM symbol is needed to provide cognitive radio system Source, terminal device need to exist in silent sub-carrier resources or t easet ofasubcarriers resource corresponding logical in cognitive radio system During the reference signal of letter system, then terminal device needs the cognition wireless in silent system-frame resource in cognitive radio system Electric system needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need silent subcarrier money The reference signal is not emitted in source or t easet ofasubcarriers resource.
Situation three, when there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, eventually End equipment needs the cognitive radio system in silent system-frame resource in the corresponding cognitive radio system of each antenna port Need cognitive radio system of the silent sub-frame resources either in OFDM symbol resource need silent sub-carrier resources or Any signal is not emitted in t easet ofasubcarriers resource.
Embodiment three
Based on the same inventive concept of the above method, additionally provide a kind of network side equipment in the embodiment of the present invention, such as Shown in Figure 17, which includes：
Determining module 11, for determining that cognitive radio system needs silent frequency resource and time resource；
Generation module 12, for utilizing the silent pattern of the frequency resource and time resource generation cell；
First processing module 13, for using on the corresponding resource location of the silent pattern received signal into line frequency Spectrum perceives；And/or the silent pattern is sent to the terminal device in the cell, it is utilized by the terminal device described Received signal carries out frequency spectrum perception on the corresponding resource location of silent pattern.
The determining module 11, specifically for the elder generation of the corresponding authoring system of working frequency points according to cognitive radio system It tests information and determines that the cognitive radio system needs silent frequency resource.
The determining module 11, specifically for working as, the channel to be perceived of working frequency points of cognitive radio system is corresponding to be awarded The power spectral density of system signal is weighed when frequency domain distribution is uniform, determines that the cognitive radio system needs silent frequency money Source is uniformly distributed in the channel to be perceived；Alternatively,
When the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system includes in frequency domain More than specified power signal when, determine that the cognitive radio system needs silent frequency resource more than the specified work( The frequency location of rate；Alternatively,
When the power spectral density of the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system In specific frequency position during integrated distribution, determine that the cognitive radio system needs silent frequency resource in the specific frequency Rate position.
The first processing module 13 specifically for generating the index of the silent pattern, and is broadcasted by system message The index of the silence pattern；The rope of the silent pattern is obtained by monitoring the system message of this Cell Broadcast CB by terminal device Draw, and determine the silent pattern corresponding to the index of the silent pattern.
The silent pattern that the generation module 12 generates specifically includes：Cognitive radio system needs silent system Frame resource, cognitive radio system need silent sub-frame resources or orthogonal frequency division multiplex OFDM sign resources and cognition Radio system needs silent sub-carrier resources or t easet ofasubcarriers resource.
The first processing module 13 is additionally operable to when carrying out scheduling of resource, needs silence in cognitive radio system Cognitive radio system in system-frame resource needs the cognitive radio in silent sub-frame resources or OFDM symbol resource System needs not dispatch terminal device in silent sub-carrier resources or t easet ofasubcarriers resource；And/or
The cognitive radio system in silent system-frame resource is needed to need silent subframe in cognitive radio system Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or t easet ofasubcarriers resource to resource On do not emit signal.
The first processing module 13, specifically for check cognitive radio system need silent sub-carrier resources or T easet ofasubcarriers resource occupies whether resource conflicts with physical layer control channel；If so, it is needed in cognitive radio system quiet Cognitive radio system in silent system-frame resource needs all sons in silent sub-frame resources or OFDM symbol resource Do not emit signal in carrier resource or t easet ofasubcarriers resource；If not, silent system is needed in cognitive radio system Cognitive radio system in frame resource needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource It needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during pilot tone, Cognitive radio system need the cognitive radio system in silent system-frame resource need silent sub-frame resources or Cognitive radio system in OFDM symbol resource needs not emit in silent sub-carrier resources or t easet ofasubcarriers resource The pilot tone；Alternatively, when cognitive radio system needs the presence of reference in silent sub-carrier resources or t easet ofasubcarriers resource During signal, the cognitive radio system in silent system-frame resource is needed to need silent subframe money in cognitive radio system Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource in source The reference signal is not emitted；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, in each antenna The corresponding cognitive radio system in port needs the cognitive radio system in silent system-frame resource to need silent subframe Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or t easet ofasubcarriers resource to resource On do not emit signal.
The first processing module 13, specifically for needing silent sub-frame resources or OFDM in cognitive radio system Signal is received in sign resources, and select cognitive radio system need the silent corresponding frequency location of sub-carrier resources or The output signal of the corresponding frequency location of t easet ofasubcarriers resource, and the output signal of corresponding position is carried out at signal detection Reason, obtains the whether occupied frequency spectrum perception result of channel to be perceived；Alternatively,
It needs to receive signal in silent sub-frame resources or OFDM symbol resource, and to cognition in cognitive radio system Radio system needs the silent corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource Signal be filtered, and to filtered signal carry out signal detection processing, obtain the whether occupied frequency of channel to be perceived Compose sensing results.
Wherein, the modules of apparatus of the present invention can be integrated in one, and can also be deployed separately.Above-mentioned module can close And be a module, multiple submodule can also be further split into.
Embodiment three
Based on the same inventive concept of the above method, additionally provide a kind of terminal device in the embodiment of the present invention, such as scheme Shown in 17, which includes：
Receiving module 21, for receiving the silent pattern of network side equipment notice；Wherein, the silent pattern is the net Network side apparatus after determining that cognitive radio system needs silent frequency resource and time resource, using the frequency resource and Time resource is generated and is notified to the silent pattern of terminal device；
Frequency spectrum sensing module 22, for using on the corresponding resource location of the silent pattern received signal into line frequency Spectrum perceives.
The receiving module 21, the system message that this Cell Broadcast CB is monitored specifically for passing through obtain the silent figure of this cell The index of sample, and determine the silent pattern corresponding to the index of the silent pattern.
The silent pattern that the receiving module 21 receives specifically includes：Cognitive radio system needs silent system Frame resource, cognitive radio system need silent sub-frame resources or orthogonal frequency division multiplex OFDM sign resources and cognition Radio system needs silent sub-carrier resources or t easet ofasubcarriers resource.
The terminal device further includes：Second processing module 23, for needing silent system-frame in cognitive radio system Cognitive radio system in resource needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need Do not emit signal in sub-carrier resources or t easet ofasubcarriers resource that will be silent.
The Second processing module 23, specifically for check cognitive radio system need silent sub-carrier resources or T easet ofasubcarriers resource occupies whether resource conflicts with physical layer control channel；If so, it is needed in cognitive radio system quiet Cognitive radio system in silent system-frame resource needs all sons in silent sub-frame resources or OFDM symbol resource Do not emit signal in carrier resource or t easet ofasubcarriers resource；If not, silent system is needed in cognitive radio system Cognitive radio system in frame resource needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource It needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during pilot tone, Cognitive radio system need the cognitive radio system in silent system-frame resource need silent sub-frame resources or Cognitive radio system in OFDM symbol resource needs not emit in silent sub-carrier resources or t easet ofasubcarriers resource The pilot tone；Alternatively, when cognitive radio system needs the presence of reference in silent sub-carrier resources or t easet ofasubcarriers resource During signal, the cognitive radio system in silent system-frame resource is needed to need silent subframe money in cognitive radio system Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource in source The reference signal is not emitted；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, in each antenna The corresponding cognitive radio system in port needs the cognitive radio system in silent system-frame resource to need silent subframe Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or t easet ofasubcarriers resource to resource On do not emit signal.
The frequency spectrum sensing module 22, specifically for needing silent sub-frame resources or OFDM in cognitive radio system Signal is received in sign resources, and select cognitive radio system need the silent corresponding frequency location of sub-carrier resources or The output signal of the corresponding frequency location of t easet ofasubcarriers resource, and the output signal of corresponding position is carried out at signal detection Reason, obtains the whether occupied frequency spectrum perception result of channel to be perceived；Alternatively,
It needs to receive signal in silent sub-frame resources or OFDM symbol resource, and to cognition in cognitive radio system Radio system needs the silent corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource Signal be filtered, and to filtered signal carry out signal detection processing, obtain the whether occupied frequency of channel to be perceived Compose sensing results.
Wherein, the modules of apparatus of the present invention can be integrated in one, and can also be deployed separately.Above-mentioned module can close And be a module, multiple submodule can also be further split into.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be by Software adds the mode of required general hardware platform to realize, naturally it is also possible to which by hardware, but the former is more in many cases Good embodiment.Based on such understanding, what technical scheme of the present invention substantially in other words contributed to the prior art Part can be embodied in the form of software product, which is stored in a storage medium, if including Dry instruction is used so that a computer equipment（Can be personal computer, server or the network equipment etc.）Perform this hair Method described in bright each embodiment.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, module or stream in attached drawing Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment It is distributed in the device of embodiment, respective change can also be carried out and be located in one or more devices different from the present embodiment.On The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Disclosed above is only several specific embodiments of the present invention, and still, the present invention is not limited to this, any ability What the technical staff in domain can think variation should all fall into protection scope of the present invention.

Claims (24)

1. a kind of frequency spectrum sensing method, which is characterized in that this method includes：
Network side equipment determines that cognitive radio system needs silent frequency resource and time resource；
The network side equipment generates the silent pattern of cell using the frequency resource and time resource；
The network side equipment utilizes the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern； The terminal device being sent to the silent pattern with, the network side equipment in the cell, is utilized by the terminal device Received signal carries out frequency spectrum perception on the corresponding resource location of the silence pattern；
Wherein, the silent pattern is sent to the terminal device in the cell by the network side equipment, is specifically included：
The index of the network side equipment generation silent pattern, and pass through the rope that system message broadcasts the silent pattern Draw；The index of the silent pattern is obtained, and determine institute by monitoring the system message of this Cell Broadcast CB by the terminal device State the silent pattern corresponding to the index of silent pattern.
2. the method as described in claim 1, which is characterized in that it is quiet that the network side equipment determines that cognitive radio system needs Silent frequency resource, specifically includes：
The network side equipment determines institute according to the prior information of the corresponding authoring system of working frequency points of cognitive radio system Stating cognitive radio system needs silent frequency resource.
3. method as claimed in claim 2, which is characterized in that the network side equipment is according to the work of cognitive radio system The prior information of the corresponding authoring system of frequency point determines that the cognitive radio system needs silent frequency resource, specific to wrap It includes：
When the power spectral density of the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system is in frequency When domain is evenly distributed, the network side equipment determines that the cognitive radio system needs silent frequency resource to wait to feel described Know in channel and be uniformly distributed；Alternatively,
It is more than when the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system includes in frequency domain During the signal of specified power, the network side equipment determine the cognitive radio system need silent frequency resource more than The frequency location of the specified power；Alternatively,
When the power spectral density of the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system is in spy When determining frequency location integrated distribution, the network side equipment determines that the cognitive radio system needs silent frequency resource to exist The specific frequency position.
4. the method as described in claim 1, which is characterized in that the silence pattern specifically includes：
Cognitive radio system needs silent system-frame resource, cognitive radio system to need silent sub-frame resources or just Frequency division multiplex OFDM sign resources and cognitive radio system is handed over to need silent sub-carrier resources or t easet ofasubcarriers money Source.
5. method as claimed in claim 4, which is characterized in that the network side equipment is provided using the frequency resource and time After the silent pattern of source generation cell, the method further includes：
When carrying out scheduling of resource, the network side equipment needs recognizing in silent system-frame resource in cognitive radio system Know that radio system needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need silent son Terminal device is not dispatched in carrier resource or t easet ofasubcarriers resource；And/or
The network side equipment needs the cognitive radio system in silent system-frame resource to need in cognitive radio system Cognitive radio system of the silent sub-frame resources either in OFDM symbol resource needs silent sub-carrier resources or son to carry Do not emit signal in wave set resource.
6. method as claimed in claim 5, which is characterized in that the network side equipment needs silence in cognitive radio system System-frame resource on cognitive radio system need cognition wireless in silent sub-frame resources or OFDM symbol resource Electric system needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource, specifically includes：
The network side equipment check cognitive radio system need silent sub-carrier resources or t easet ofasubcarriers resource with Physical layer control channel occupies whether resource conflicts；If so, the network side equipment needs silence in cognitive radio system System-frame resource on cognitive radio system need all sub- loads in silent sub-frame resources or OFDM symbol resource Do not emit signal in wave resource or t easet ofasubcarriers resource；If not, the network side equipment is needed in cognitive radio system Recognizing in the sub-frame resources of cognitive radio system needs silence or OFDM symbol resource in system-frame resource that will be silent Know that radio system needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during pilot tone, the net Network side apparatus needs the cognitive radio system in silent system-frame resource to need silent subframe in cognitive radio system Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or t easet ofasubcarriers resource to resource On do not emit the pilot tone；Alternatively, when cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource There are during reference signal, the network side equipment needs the cognition wireless in silent system-frame resource in cognitive radio system Electric system needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need silent subcarrier money The reference signal is not emitted in source or t easet ofasubcarriers resource；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, the network side is set It is standby the cognitive radio system in silent system-frame resource to be needed to need in the corresponding cognitive radio system of each antenna port Cognitive radio system of the silent sub-frame resources either in OFDM symbol resource needs silent sub-carrier resources or son to carry Do not emit signal in wave set resource.
7. method as claimed in claim 4, which is characterized in that the network side equipment utilizes corresponding in the silent pattern Received signal carries out frequency spectrum perception on resource location, specifically includes：
The network side equipment needs to receive letter in silent sub-frame resources or OFDM symbol resource in cognitive radio system Number, and cognitive radio system is selected to need the silent corresponding frequency location of sub-carrier resources or t easet ofasubcarriers resource pair The output signal for the frequency location answered, and signal detection processing is carried out to the output signal of corresponding position, obtain channel to be perceived Whether occupied frequency spectrum perception result；Alternatively,
The network side equipment needs to receive letter in silent sub-frame resources or OFDM symbol resource in cognitive radio system Number, and the silent corresponding frequency location of sub-carrier resources or t easet ofasubcarriers resource is needed to correspond to cognitive radio system The signal of frequency location be filtered, and signal detection processing is carried out to filtered signal, whether obtain channel to be perceived Occupied frequency spectrum perception result.
8. a kind of frequency spectrum sensing method, which is characterized in that this method includes：
Terminal device receives the silent pattern of network side equipment notice；Wherein, the silent pattern is that the network side equipment exists After determining frequency resource and time resource that cognitive radio system needs silence, the frequency resource and time resource is utilized to give birth to Into and notify to the silent pattern of the terminal device；
The terminal device utilizes the received signal progress frequency spectrum perception on the corresponding resource location of the silence pattern；
Wherein, the terminal device receives the silent pattern of network side equipment notice, specifically includes：
The index that the terminal device obtains the silent pattern of this cell by monitoring the system message of this Cell Broadcast CB, and determine Silent pattern corresponding to the index of the silence pattern.
9. method as claimed in claim 8, which is characterized in that the silence pattern includes：
Cognitive radio system needs silent system-frame resource, cognitive radio system to need silent sub-frame resources or just Frequency division multiplex OFDM sign resources and cognitive radio system is handed over to need silent sub-carrier resources or t easet ofasubcarriers money Source.
10. method as claimed in claim 9, which is characterized in that the terminal device receives the silence of network side equipment notice After pattern, the method further includes：
It is quiet that the terminal device needs the cognitive radio system in silent system-frame resource to need in cognitive radio system Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or subcarrier to silent sub-frame resources Do not emit signal in set resource.
11. method as claimed in claim 10, which is characterized in that the terminal device needs silence in cognitive radio system System-frame resource on cognitive radio system need cognition wireless in silent sub-frame resources or OFDM symbol resource Electric system needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource, specifically includes：
The terminal device checks that cognitive radio system needs silent sub-carrier resources or t easet ofasubcarriers resource and object Reason layer control channel occupies whether resource conflicts；If so, the terminal device is what cognitive radio system needed silence Cognitive radio system in frame resource of uniting needs all subcarriers money in silent sub-frame resources or OFDM symbol resource Do not emit signal in source or t easet ofasubcarriers resource；If not, the terminal device needs silence in cognitive radio system System-frame resource on cognitive radio system need cognition wireless in silent sub-frame resources or OFDM symbol resource Electric system needs not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during pilot tone, the end End equipment needs the cognitive radio system in silent system-frame resource to need silent subframe money in cognitive radio system Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource in source The pilot tone is not emitted；Alternatively, when cognitive radio system needs silent sub-carrier resources or t easet ofasubcarriers resource memory In reference signal, the terminal device needs the cognitive radio system in silent system-frame resource in cognitive radio system System need the cognitive radio system in silent sub-frame resources or OFDM symbol resource need silent sub-carrier resources or The reference signal is not emitted in person's t easet ofasubcarriers resource；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, the terminal device The cognitive radio system in silent system-frame resource is needed to need in the corresponding cognitive radio system of each antenna port quiet Either the cognitive radio system in OFDM symbol resource needs silent sub-carrier resources or subcarrier to silent sub-frame resources Do not emit signal in set resource.
12. method as claimed in claim 9, which is characterized in that the terminal device utilizes corresponding in the silent pattern Received signal carries out frequency spectrum perception on resource location, specifically includes：
The terminal device needs to receive signal in silent sub-frame resources or OFDM symbol resource in cognitive radio system, And select cognitive radio system that the silent corresponding frequency location of sub-carrier resources or t easet ofasubcarriers resource is needed to correspond to Frequency location output signal, and signal detection processing is carried out to the output signal of corresponding position, obtaining channel to be perceived is No occupied frequency spectrum perception result；Alternatively,
The terminal device needs to receive signal in silent sub-frame resources or OFDM symbol resource in cognitive radio system, And need the silent corresponding frequency location of sub-carrier resources or t easet ofasubcarriers resource corresponding cognitive radio system The signal of frequency location is filtered, and to filtered signal carry out signal detection processing, obtain channel to be perceived whether by The frequency spectrum perception result of occupancy.
13. a kind of network side equipment, which is characterized in that the network side equipment includes：
Determining module, for determining that cognitive radio system needs silent frequency resource and time resource；
Generation module, for utilizing the silent pattern of the frequency resource and time resource generation cell；
First processing module, for utilizing the received signal progress frequency spectrum sense on the corresponding resource location of the silence pattern Know；With the terminal device being sent to the silent pattern in the cell, by the terminal device using in the silent pattern Received signal carries out frequency spectrum perception on corresponding resource location；
Wherein, the first processing module specifically for generating the index of the silent pattern, and passes through system message and broadcasts institute State the index of silent pattern；By the terminal device the silent pattern is obtained by monitoring the system message of this Cell Broadcast CB Index, and determine the silent pattern corresponding to the index of the silent pattern.
14. network side equipment as claimed in claim 13, which is characterized in that
The determining module, specifically for the prior information of the corresponding authoring system of working frequency points according to cognitive radio system Determine that the cognitive radio system needs silent frequency resource.
15. network side equipment as claimed in claim 14, which is characterized in that
The determining module, the corresponding authoring system of channel to be perceived of the working frequency points specifically for working as cognitive radio system The power spectral density of signal determines that the cognitive radio system needs silent frequency resource in institute when frequency domain distribution is uniform It states and is uniformly distributed in channel to be perceived；Alternatively,
It is more than when the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system includes in frequency domain During the signal of specified power, determine that the cognitive radio system needs silent frequency resource more than the specified power Frequency location；Alternatively,
When the power spectral density of the corresponding authoring system signal of the channel to be perceived of the working frequency points of cognitive radio system is in spy When determining frequency location integrated distribution, determine that the cognitive radio system needs silent frequency resource in the specific frequency position It puts.
16. network side equipment as claimed in claim 13, which is characterized in that
The silent pattern of the generation module generation specifically includes：Cognitive radio system needs silent system-frame money Source, cognitive radio system need silent sub-frame resources or orthogonal frequency division multiplex OFDM sign resources and cognition wireless Electric system needs silent sub-carrier resources or t easet ofasubcarriers resource.
17. network side equipment as claimed in claim 16, which is characterized in that
The first processing module is additionally operable to when carrying out scheduling of resource, and silent system-frame is needed in cognitive radio system Cognitive radio system in resource needs the cognitive radio system in silent sub-frame resources or OFDM symbol resource to need Terminal device is not dispatched in sub-carrier resources or t easet ofasubcarriers resource that will be silent；And/or
The cognitive radio system in silent system-frame resource is needed to need silent sub-frame resources in cognitive radio system Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource not Emit signal.
18. network side equipment as claimed in claim 17, which is characterized in that
The first processing module, specifically for checking that cognitive radio system needs silent sub-carrier resources or subcarrier Set resource occupies whether resource conflicts with physical layer control channel；If so, it is what cognitive radio system needed silence Cognitive radio system in frame resource of uniting needs all subcarriers money in silent sub-frame resources or OFDM symbol resource Do not emit signal in source or t easet ofasubcarriers resource；If not, silent system-frame resource is needed in cognitive radio system On cognitive radio system that the cognitive radio system in silent sub-frame resources or OFDM symbol resource is needed to need is quiet Do not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system needs recognizing there are during pilot tone in silent sub-carrier resources or t easet ofasubcarriers resource Radio system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources or OFDM symbols Cognitive radio system in number resource needs not emitting the pilot tone in silent sub-carrier resources or t easet ofasubcarriers resource； Alternatively, when cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during reference signal, Needed in cognitive radio system the cognitive radio system in silent system-frame resource need silent sub-frame resources or Cognitive radio system in OFDM symbol resource needs not emit in silent sub-carrier resources or t easet ofasubcarriers resource The reference signal；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, in each antenna port Corresponding cognitive radio system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource not Emit signal.
19. network side equipment as claimed in claim 16, which is characterized in that
The first processing module, specifically for silent sub-frame resources or OFDM symbol being needed to provide in cognitive radio system Signal is received on source, and cognitive radio system is selected to need the silent corresponding frequency location of sub-carrier resources or subcarrier Gather the output signal of the corresponding frequency location of resource, and signal detection processing is carried out to the output signal of corresponding position, obtain The whether occupied frequency spectrum perception result of channel to be perceived；Alternatively,
It needs to receive signal, and to cognition wireless in silent sub-frame resources or OFDM symbol resource in cognitive radio system Electric system needs the letter of the silent corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource It number is filtered, and signal detection processing is carried out to filtered signal, obtain the whether occupied frequency spectrum sense of channel to be perceived Know result.
20. a kind of terminal device, which is characterized in that the terminal device includes：
Receiving module, for receiving the silent pattern of network side equipment notice；Wherein, the silent pattern is that the network side is set For after determining that cognitive radio system needs silent frequency resource and time resource, the frequency resource and time is utilized to provide Source generates and notifies to the silent pattern of terminal device；
Frequency spectrum sensing module, for utilizing the received signal progress frequency spectrum sense on the corresponding resource location of the silence pattern Know；
Wherein, the receiving module, the system message that this Cell Broadcast CB is monitored specifically for passing through obtain the silent figure of this cell The index of sample, and determine the silent pattern corresponding to the index of the silent pattern.
21. terminal device as claimed in claim 20, which is characterized in that
The silent pattern that the receiving module receives specifically includes：Cognitive radio system needs silent system-frame money Source, cognitive radio system need silent sub-frame resources or orthogonal frequency division multiplex OFDM sign resources and cognition wireless Electric system needs silent sub-carrier resources or t easet ofasubcarriers resource.
22. terminal device as claimed in claim 21, which is characterized in that further include：
Second processing module, for the cognitive radio system in silent system-frame resource to be needed to need in cognitive radio system The cognitive radio system of sub-frame resources that will be silent either in OFDM symbol resource needs silent sub-carrier resources or son Do not emit signal in carrier set resource.
23. terminal device as claimed in claim 22, which is characterized in that
The Second processing module, specifically for checking that cognitive radio system needs silent sub-carrier resources or subcarrier Set resource occupies whether resource conflicts with physical layer control channel；If so, it is what cognitive radio system needed silence Cognitive radio system in frame resource of uniting needs all subcarriers money in silent sub-frame resources or OFDM symbol resource Do not emit signal in source or t easet ofasubcarriers resource；If not, silent system-frame resource is needed in cognitive radio system On cognitive radio system that the cognitive radio system in silent sub-frame resources or OFDM symbol resource is needed to need is quiet Do not emit signal in silent sub-carrier resources or t easet ofasubcarriers resource；Alternatively,
When cognitive radio system needs recognizing there are during pilot tone in silent sub-carrier resources or t easet ofasubcarriers resource Radio system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources or OFDM symbols Cognitive radio system in number resource needs not emitting the pilot tone in silent sub-carrier resources or t easet ofasubcarriers resource； Alternatively, when cognitive radio system is needed in silent sub-carrier resources or t easet ofasubcarriers resource there are during reference signal, Needed in cognitive radio system the cognitive radio system in silent system-frame resource need silent sub-frame resources or Cognitive radio system in OFDM symbol resource needs not emit in silent sub-carrier resources or t easet ofasubcarriers resource The reference signal；Alternatively,
When there are mutiple antennas emission system, and when each antenna port is corresponding with identical silent pattern, in each antenna port Corresponding cognitive radio system needs the cognitive radio system in silent system-frame resource to need silent sub-frame resources Either the cognitive radio system in OFDM symbol resource is needed in silent sub-carrier resources or t easet ofasubcarriers resource not Emit signal.
24. terminal device as claimed in claim 21, which is characterized in that
The frequency spectrum sensing module, specifically for silent sub-frame resources or OFDM symbol being needed to provide in cognitive radio system Signal is received on source, and cognitive radio system is selected to need the silent corresponding frequency location of sub-carrier resources or subcarrier Gather the output signal of the corresponding frequency location of resource, and signal detection processing is carried out to the output signal of corresponding position, obtain The whether occupied frequency spectrum perception result of channel to be perceived；Alternatively,
It needs to receive signal, and to cognition wireless in silent sub-frame resources or OFDM symbol resource in cognitive radio system Electric system needs the letter of the silent corresponding frequency location of sub-carrier resources or the corresponding frequency location of t easet ofasubcarriers resource It number is filtered, and signal detection processing is carried out to filtered signal, obtain the whether occupied frequency spectrum sense of channel to be perceived Know result.
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