CN103476037B - Towards low-power consumption multichannel frequency spectrum sensing method and the system thereof of cellular communications networks - Google Patents
Towards low-power consumption multichannel frequency spectrum sensing method and the system thereof of cellular communications networks Download PDFInfo
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- CN103476037B CN103476037B CN201310395408.9A CN201310395408A CN103476037B CN 103476037 B CN103476037 B CN 103476037B CN 201310395408 A CN201310395408 A CN 201310395408A CN 103476037 B CN103476037 B CN 103476037B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a kind of low-power consumption multichannel frequency spectrum sensing method and system thereof towards cellular communications networks, the method comprises: step 1, and channel management entity selection is shared frequency spectrum, and is multiple channels by this shared spectrum division; Step 2, channel management entity is multiple cluster of channels at frequency domain by each channel distribution, in the time of frequency spectrum perception, the channel in different channels bunch is adopted to asynchronous quiet period, and the channel in same cluster of channels is adopted to the synchronize quiet phase; Step 3, during quiet period, cognitive user terminal completes the frequency spectrum perception operation in corresponding current area according to the control of cognitive base station, and sensing results is reported to cognitive base station, after by cognitive base station, sensing results being integrated, reports to channel management entity; And step 4, channel management entity, according to the sensing results after integrating, upgrades the status information of current all channels in each community, and feeds back to cognitive base station. The present invention has reduced system and has carried out the number of times of frequent perception, thereby has reduced power consumption.
Description
Technical field
The present invention relates to cognitive radio networks, particularly relate at the cellular communications network based on cognitive radioIn network, carry out the method and system of low-power consumption multichannel frequency spectrum perception.
Background technology
Along with the raising of the message transmission rate of radio communication, for the demand of frequency spectrum resource in continuous increase,And fixing spectrum allocation policy causes some frequency range utilization rate on time and space not high. Cognitive radioThe proposition object of (CognitiveRadio, CR) is by the perception to current wireless electrical environment, from timeBetween and on space, re-use idle frequency spectrum, solve current wireless communication network intermediate frequency spectrum resource nervous and frequentlyHow the problem that spectrum resource utilization rate is low, mainly study on the basis that does not affect authorized user proper communicationUpper, utilize idle frequency spectrum to communicate to chance formula, meet the service needed of cognitive user and improve frequency spectrum profitBy rate.
In CR system, the user that share spectrum resources is provided is authorized user (PrimaryUser, PU),The system at its place is authoring system, and chance formula ground utilizes the user who shares frequency spectrum hollow ideler frequency spectrum resource for recognizingKnow user (CognitiveUser, CU), the system at its place is cognitive system (CR system). ShareFrequency spectrum refers to that in fixing spectrum allocation policy, distributing to authoring system uses, and other system does not permit simultaneouslyPermitted the frequency spectrum using, idle frequency spectrum is also frequency spectrum cavity-pocket, and being that authorized user is untapped can be used by CUFrequency spectrum resource. In order to protect authorized user and effectively to utilize idle frequency spectrum, CR system need to be entered channelWhether row perception, occur on this channel to detect authorized user, perception is by cognitive base station (CognitiveBaseStation, CBS) cooperated the gathering with spectrum allocation by CBS of testing result with CUOr other entity completes.
When CBS and CU are during to corresponding channel-aware, the CU being operated on this channel need to keep oneMourning in silence of section time, can not impact sensing results with the communication that ensures CU, is called during this period of time quietThe silent phase. Quiet period can be divided into two kinds by implementation: synchronize quiet phase and asynchronous quiet period, and quiet synchronouslySilent interim, all CU in CR system stop sending data at one time, and it is right that CR system completesThe detection of all channels; In asynchronous quiet period, the quiet period of different channels can be not in the same time, eachTest section channel, CU only need stop transmitting data on the channel detecting, and on other channel, can continueTransmission data.
In order to complete multi channel frequency spectrum perception in cellular network, in existing CR technology, CR system is for beingIn system, the different quiet period of the distribution of different operating channel adopts the method for asynchronous quiet period, CBS and CUAll there is the function of Channel Detection, in given quiet period, corresponding channel is detected respectively, be operated inCBS on this channel and CU temporarily stop at this channel data, are not operated on this channelCBS and CU only need to detect this channel. Detection finishes under rear CU sends to sensing resultsCBS, then CR system is upgraded status information and the channel allocation information of current channel according to testing result.
In existing technical scheme, when each channel is during in quiet period, the CBS in network and CUNeed to detect this channel, during due to detection, produce a large amount of power consumptions, with respect to traditional wireless communication netNetwork, the power consumption of cognitive radio networks can increase greatly, and this has not only increased the operation cost of system,Also can make CU continuous working period to reduce. In the time that being carried out to frequency spectrum perception, channel do not consider simultaneouslyThe actual conditions of each community judge whether that Gai community need to carry out corresponding frequency spectrum perception, to reduce systemThe detection number of times of system is to reduce energy consumption.
Summary of the invention
The object of the present invention is to provide a kind of low-power consumption multichannel frequency spectrum perception towards cellular communications networksMethod and system thereof, for sharing again and again to avoid as far as possible by making full use of at cognitive radio systemAuthorized user is disturbed, and the number of times that reduces system and carry out frequent perception, reduce the power consumption of CU and CBS.
To achieve these goals, the invention provides a kind of low-power consumption multichannel towards cellular communications networks frequentlySpectrum cognitive method, is characterized in that, comprising:
Step 1, the shared frequency spectrum that channel management entity selection present cognitive radio system uses, and willThis shared spectrum division is multiple channels;
Step 2, channel management entity is multiple cluster of channels at frequency domain by each channel distribution, in the time of frequency spectrum perceptionChannel in different channels bunch is adopted to asynchronous quiet period, the channel in same cluster of channels is adopted to synchronize quietPhase;
Step 3, during quiet period, cognitive user terminal completes corresponding current according to the control of cognitive base stationFrequency spectrum perception operation in community, and sensing results is reported to cognitive base station, by cognitive base station, perception is tiedFruit is reported to channel management entity after integrating; And
Step 4, channel management entity, according to the sensing results after integrating, upgrades current all channels at eachThe status information of community, and feed back to cognitive base station.
Described low-power consumption multichannel frequency spectrum sensing method, wherein, in described step 1, comprising:
Described channel management entity is working channel, alternate channel and not according to the state of channel by channel distributionAvailable channel.
Described low-power consumption multichannel frequency spectrum sensing method, wherein, in described step 3, comprising:
Mourning in silence according to the working channel of current area, alternate channel and traffic case in described cognitive base stationDuring phase, dispose as required the frequency spectrum perception operation in community.
Described low-power consumption multichannel frequency spectrum sensing method, wherein, in described step 3, comprising:
Described cognitive base station judges according to the load condition of current area whether current area needs to carry out frequency spectrumSense operation, if desired carries out frequency spectrum perception operation, sends and holds to the cognitive user terminal in current areaThe signaling of line frequency spectrum sense operation, carries out frequency spectrum perception operation if do not need, and notifies recognizing in current areaKnow that user terminal does not carry out frequency spectrum perception operation.
Described low-power consumption multichannel frequency spectrum sensing method, wherein, in described step 3, comprising:
When working channel or the alternate channel that need to carry out the cluster of channels of frequency spectrum perception and comprise current area, rightFrequency spectrum perception operation need to be carried out in this community, notifies cognitive user terminal in current area in the time of quiet periodWorking channel or alternate channel are detected; Or
When not comprising working channel and the alternate channel of current area in the cluster of channels that need to carry out frequency spectrum perception,Determine whether to carry out frequency spectrum perception operation according to the load condition of current area:
A, work at present channel meet the business demand of community and alternate channel when more, do not need to carry outFrequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out frequency spectrum senseKnow operation, transfer part alternate channel to working channel as required;
C, when working channel and alternate channel less, but the portfolio of community is when little, current area does not needCarry out frequency spectrum perception operation, otherwise need to carry out frequency spectrum perception operation, and report money to channel management entityApply in source, if application is not to enough resources, once proceeds frequency spectrum perception operation or work as continuously upperWhen repeatedly frequency spectrum perception cannot obtain new resource, stop local resource application by channel management entity.
To achieve these goals, the present invention also provides a kind of low-power consumption multichannel towards cellular communications networksFrequency spectrum perception system, is characterized in that, comprising: channel management entity, cognitive base station and the cognition of servingUser terminal;
Channel management entity, for the shared frequency spectrum of selecting present cognitive radio system to use, and shouldShared spectrum division is multiple channels, is multiple cluster of channels, at frequency domain by each channel distribution in the time of frequency spectrum perceptionChannel in different channels bunch is adopted to asynchronous quiet period, the channel in same cluster of channels is adopted to synchronize quietPhase, the sensing results gathering according to cognitive base station, upgrades the status information of current all channels in each community,And feed back to cognitive base station;
Cognitive user terminal, for completing the frequency spectrum perception in corresponding current area according to the control of cognitive base stationOperation, and sensing results is reported to cognitive base station;
Cognitive base station, is responsible for the use of share spectrum resources in community, after sensing results is integrated, reports to letterRoad management entity.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described channel management entity is according to channelState is working channel, alternate channel and unavailable channel by channel distribution.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station is according to current areaWorking channel, alternate channel and traffic case are being disposed as required the frequency spectrum perception in community during quiet periodOperation.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station is according to current areaLoad condition judges that whether current area needs to carry out frequency spectrum perception operation, if desired carries out frequency spectrum perception behaviourDo, send to the cognitive user terminal in current area the signaling of carrying out frequency spectrum perception, carry out if do not needFrequency spectrum perception operation, notifies the cognitive user terminal in current area not carry out frequency spectrum perception operation.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station also for:
When working channel or the alternate channel that need to carry out the cluster of channels of frequency spectrum perception and comprise current area, rightFrequency spectrum perception operation need to be carried out in this community, notifies cognitive user terminal in current area in the time of quiet periodWorking channel or alternate channel are detected; Or
When not comprising working channel and the alternate channel of current area in the cluster of channels that need to carry out frequency spectrum perception,Determine whether to carry out frequency spectrum perception operation according to the load condition of current area:
A, work at present channel meet the business demand of community and alternate channel when more, do not need to carry outFrequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out frequency spectrum senseKnow operation, transfer part alternate channel to working channel as required;
C, when working channel and alternate channel less, but the portfolio of community is when little, current area does not needCarry out frequency spectrum perception operation, otherwise need to carry out frequency spectrum perception operation, and report money to channel management entityApply in source, if application is not to enough resources, once proceeds frequency spectrum perception operation or work as continuously upperWhen repeatedly frequency spectrum perception cannot obtain new resource, stop local resource application by channel management entity.
Compared with prior art, useful technique effect of the present invention is:
The invention provides a kind of low-power consumption multichannel frequency spectrum sense towards cognitive radio cellular communications networksThe method and system of knowing, it is classified according to channel status, and according to the concrete condition of cell load, knotClose dissimilar channel quantity, judge whether to carry out frequency spectrum perception operation, reduce frequency spectrum perception number of timesTo reduce power consumption.
Brief description of the drawings
Fig. 1 is the low-power consumption multichannel frequency spectrum sensing method overall flow of the present invention towards cellular communications networksFigure;
Fig. 2 is the low-power consumption multichannel frequency spectrum perception entire system structure of the present invention towards cellular communications networksFigure;
Fig. 3 is the division schematic diagram of subchannel of the present invention and cluster of channels;
Fig. 4 is the quiet period mechanism of multichannel of the present invention bunch;
Fig. 5 is the quiet period mechanism of each channel in individual channel of the present invention bunch;
Fig. 6 is the method flow diagram of multichannel frequency spectrum detection in one embodiment of the invention;
Fig. 7 is one embodiment of the invention small area distribution schematic diagram;
Fig. 8 is the frequency while comprising cell operation channel and alternate channel in cluster of channels in one embodiment of the inventionSpectrum detection method flow chart;
Frequency spectrum detecting method flow chart when Fig. 9 is one embodiment of the invention small area inadequate resource.
Detailed description of the invention
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as to of the present inventionLimit.
As shown in Figure 1, be that the present invention is whole towards the low-power consumption multichannel frequency spectrum sensing method of cellular communications networksBody flow chart, this flow process comprises:
Step 101, the shared frequency spectrum that channel management entity 10 selects current system to use, and will shareSpectrum division is some channels, is divided into working channel, alternate channel and unavailable letter according to the state of channelRoad.
Step 102, channel management entity 10 is some cluster of channels by channel distribution, difference when frequency spectrum perceptionChannel in cluster of channels adopts asynchronous quiet period, and the channel in same cluster of channels adopts the synchronize quiet phase.
Step 103, during quiet period, is completed in its community by CBS30 and the CU30 that serves thereofFrequency spectrum perception operation, after perception completes, CU20 reports to CBS30, CBS30 integrates sensing resultsRear report is to channel management entity 10.
Step 104, channel management entity 10, according to the sensing results gathering, upgrades current all channels and existsThe status information of each community feeds back to each CBS30 simultaneously.
As shown in Figure 2, be that the present invention is whole towards the low-power consumption multichannel frequency spectrum perception system of cellular communications networksBody structure figure. This system 200 comprises: channel management entity 10, CU20, CBS30.
Channel management entity 10, is responsible for the shared frequency spectrum that selection current system uses, and will share frequency spectrum and drawBe divided into some subchannels, be divided into working channel, alternate channel and unavailable channel according to the state of channel,At frequency domain, subchannel is divided into some cluster of channels, channel when frequency spectrum perception in different channels bunch adopts asynchronousQuiet period, the channel in same cluster of channels adopts the synchronize quiet phase; According to the sensing results gathering, upgrade and work asFront all channels, in the status information of each community, feed back to each CBS30 simultaneously.
CU20, carries out frequency spectrum perception operation for the quiet period mechanism according to CBS30 to channel, and willResult is reported to CBS30.
CBS30, is responsible for the use of share spectrum resources in community, in CBS30 and CU20 Dui Qi communityFrequency spectrum perception operation, after perception completes, CU20 reports to CBS30, CBS30 integrates sensing resultsRear report is to channel management entity 10.
In the present invention, subchannel is divided into some cluster of channels by channel management entity 10, and frequency spectrum perception is notChannel in cochannel bunch adopts the asynchronous silent phase, and the channel in same cluster of channels adopts the synchronize quiet phase; CBS30 according to the situation of current area working channel, alternate channel and cell business volume, in the time of quiet period as requiredDispose the frequency spectrum perception operation in community, in cognitive radio system, make full use of shared frequency spectrum to realize,In avoiding as far as possible authorized user interference, minimizing system is carried out the number of times of frequency spectrum perception, reducesThe power consumption of CU20 and CBS30.
As shown in Figure 3, be the division schematic diagram of subchannel of the present invention and cluster of channels; Fig. 4 is that the present invention believes moreThe quiet period mechanism in road bunch; Fig. 5 is the quiet period mechanism of each channel in individual channel of the present invention bunch; Fig. 6It is the method flow diagram of multichannel frequency spectrum detection in one embodiment of the invention.
In Fig. 3, shared frequency spectrum is that channel management entity is the frequency range of system choice for use, according to system bandWidely be divided into 1～12 sub-channels and be divided into some cluster of channels, simultaneously due to the uncertainty of authorized user,The position difference that authorized user occurs in not sharing frequency spectrum in the same time.
In Fig. 4, the quiet period mechanism of multichannel bunch has been described, comprise quiet period, report phase and transmission period,Quiet period is the period that base station and terminal detect frequency spectrum, and the report phase is that base station and terminal are reported and processedThe period of sensing results, transmission period is the period of base station and terminal normal data transmitting-receiving, different channels bunch quietPhase and transmission period, in the different moment, are therefore reported backward also along moving, simultaneously for letter for subsequent use in silent phase positionRoad and unavailable channel, transmission period does not have transfer of data.
In Fig. 5, the quiet period mechanism of each channel in individual channel bunch is described, the implication in itself and Fig. 4Similar, simultaneously in this figure individual channel bunch, the quiet period of each channel is in the identical moment.
As shown in Figure 6, in the method providing in example of the present invention, at least comprise following content:
Step 601, the shared spectrum division that channel management entity 10 uses present cognitive radio systemFor some subchannels, whether occur according to authorized user simultaneously and when authorized user occurs channel in community beNo use by CBS30 is working channel, alternate channel and unavailable channel by channel classification.
The channel that working channel is using for current area; Alternate channel is not for distributing to current area butThe channel being used by current area, changes work letter when heavier into when make a concession scene or cell load at frequency spectrumRoad, in the time that cell load is lighter, alternate channel can be discharged and use for other communities by current area; NoAvailable channel refers to the channel except working channel and alternate channel, and therefore this local channel is standby at CBSWhen not enough with channel, can be applied for to channel management entity 10 by CBS30, its state will be by communityDown state becomes stand-by state, and in the time there is authorized user on working channel, its state becomes unavailableChannel, when occurring while causing working channel unavailable due to authorized user and current area portfolio increasesTime the working channel that uses can not meet the conditions such as business demand time, alternate channel becomes working channel. LetterThe state of Dao community also depends on the state of channel in neighbor cell, if channel A in community 1 is workChannel, in neighbor cell 2, channel A is down state, and no matter now whether authorized user existsChannel A is upper to be occurred, while only thering is no other any available channel in community 2, channel A just can becomeWorking channel.
In this part, the CR system that is divided in of channel is selected while sharing frequency spectrum and is completed.
Step 602, channel management entity 10 bunch to be divided into some cluster of channels as unit, and is pressed channelBe that cluster of channels is distributed quiet period according to the sequence number of cluster of channels order from low to high, the channel in different channels bunch is adoptedUse asynchronous quiet period, the channel in same cluster of channels adopts the synchronize quiet phase.
One of the object of dividing cluster of channels is to be convenient to carry out the configuration of quiet period, and in individual channel bunch, institute comprisesThe bandwidth of the number of channel and channel relevant with the spectral bandwidth that equipment can detect at every turn, must when distribution quiet periodMust ensure that in certain cluster of channels other all cluster of channels must be tested during again in quiet period. ThereforeThe quiet period that belongs to each channel in same cluster of channels can be in synchronization, and what adopt is synchronously quietThe silent phase; Different channels bunch adopts asynchronous quiet period mechanism, as shown in Fig. 3,4,5.
Step 603, before some cluster of channels quiet period, CBS30 can be according to the load of current areaSituation judges that whether current area needs to carry out frequency spectrum perception operation, need to carry out the CBS30 of frequency spectrum perceptionCU30 in community sends the signaling of carrying out frequency spectrum perception, does not need to carry out the CBS30 of frequency spectrum perceptionThe CU30 in notifying cell does not carry out frequency spectrum perception, this signaling comprise whether carry out frequency spectrum perception andNeed the channel of perception.
Be specially: in the time of quiet period, if desired carry out working channel that the cluster of channels of perception comprises CBS30 orAlternate channel, frequency spectrum perception operation need to be carried out in Ze Gai community, and CBS30 is the CU30 in notifying cellIn the time of quiet period, working channel or alternate channel are detected, if also have other channel in cluster of channels,CBS30 judges whether other channel to detect according to the load condition of community.
If desired carry out not comprising in the cluster of channels of perception working channel and the alternate channel of current area,CBS30 determines whether carry out frequency spectrum perception operation according to the load condition of current area, and situation is divided into:
(1). work at present channel meets the business demand of community and alternate channel when more, does not need to carry outFrequency spectrum perception operation, the CU30 in CBS30 notifying cell does not carry out frequency spectrum perception, in the time reportingCBS30 reports current area to channel management entity 10 and does not carry out frequency spectrum perception operation, and can be according to feelingsCondition release portion alternate channel;
(2). work at present channel deficiency, but when alternate channel is more, current area does not need to carry out frequency yetSpectrum sense operation, transfers part alternate channel to working channel as required;
. when working channel and alternate channel all less, but when the portfolio of community is not very large, currentCommunity does not need to carry out frequency spectrum perception operation, otherwise need to carry out frequency spectrum perception operation, and real to channel managementBody 10 reports resource bid, if not application does not obtain enough resources, once proceeds described behaviour upperDo or in the time that continuous several times frequency spectrum perception also cannot obtain new resource, stopped by channel management entity 10Local resource application, stops allowing it to carry out resource bid after a period of time again;
(4). also have a kind of special circumstances, channel must detect once in certain time interval T Nei Bei community,To upgrade the state of channel in community. As suppose channel A in community 1 in duration T not byDetected, in the cluster of channels at upper once its place during in quiet period, community 1 need to be entered channel ARow detects.
For the measurement to above-mentioned several situations, the working channel number of definition current area is N, alternate channelNumber is M, and the portfolio that current area need to be transmitted is S, and the channel capacity of working channel N is Cn(n＝1,...,N)，CminFor CnIn minimum of a value, Plow、PhighFor cell spectrum resource in a period of time TAverage service rate, for weighing cell load situation, PlowFor weighing the lighter threshold value of cell load, PhighFor weighing the heavier threshold value of cell load, can be divided into:
(1) whenTime, some work channel is converted into alternate channel, makeTo ensure higher frequency spectrum resource utilization rate, simultaneously in order to protectCard alternate channel can be not too much, and the number that limits alternate channel is 3, and remaining discharges for other littleDistrict is used. Now current area only needs testing channel and alternate channel, does not need other channels to enterRow detects. NleftRepresent the cognitive frequency spectrum number that current base station is used, NreleaseRepresent to need the channel of releaseNumber.
(2) whenTime, current testing channel and the alternate channel of only needing.
(3) whenTime, first consider to transfer alternate channel to working channel, if can meetDo not need to apply for resource, if alternate channel number while meeting this conditionBe 0, need apply for new resource and need to carry out frequency spectrum sense in next moment to channel management entity 10Know, to ensure that alternate channel is not as 0; IfStill need to carry out frequency spectrum senseKnow to obtain extra frequency spectrum resource for current area.
Realizing frequency spectrum perception is to be arranged by CR systematic unity, and the object of perception detects authorized user and obtains newResource, whether carry out frequency spectrum detection and determined by each CBS30, by reducing unnecessary frequency spectrum detectionOperation reduces frequency spectrum detection number of times and the power consumption of entire system.
Step 604, CU30 receives after the signaling of frequency spectrum perception, in quiet period, corresponding channel is heldLine frequency spectrum sense operation.
Step 605, after quiet period finishes, CU30 reports the result of perception to CBS30, does not carry outThe CU30 of the community of frequency spectrum perception does not need to carry out any operation, reports content and comprises each sub-channelsStatus information.
Step 606, CBS30 will feed back to channel management entity after the sensing results aggregation process receiving10, for the community of not carrying out frequency spectrum perception, send and do not carry out frequency spectrum to channel management entity 10The information (method that also can adopt the method for timing to receive) detecting.
Step 607, channel management entity 10 utilizes institute's acquired information to upgrade the Channel Status Table of each community,And according to the variation of channel status, upgrade working channel, alternate channel and unavailable channel in each communityStatus information. For the community of not detecting channel status remain unchanged.
Below in conjunction with specific embodiment, technical scheme of the present invention is described in detail:
Cognitive system 200 comprises 10,7 communities of a channel management entity and some users, community pointAs shown in Figure 7, the division of subchannel and cluster of channels as shown in Figure 3 for cloth.
Suppose that the working channel in community 1 is 1,3,4, alternate channel is 6,10; Work letter in community 2Road is 2, and alternate channel is 5. According to the configuration of quiet period, successively to cluster of channels 1,2, the channel in 3,4 carries outFrequency spectrum perception operation.
In the time need to detecting the channel in cluster of channels 1, in the working channel of community 1,1 and 3 are positioned atIn cluster of channels 1, thereby community 1 need to detect the channel in cluster of channels 1 in the time of quiet period, in like mannerCommunity 2 also needs to carry out Channel Detection; In the time that needs detect cluster of channels 2, the work in community 1Channel 4 is arranged in cluster of channels 2, thereby Channel Detection need to be carried out, letter for subsequent use in Er community 2 in community 1Road 5 is arranged in cluster of channels 2, and community 2 also needs to carry out Channel Detection; At needs, cluster of channels 3 is examinedWhen survey, now in community 1, working channel and alternate channel are more, can meet the business demand of current area,Thereby do not carry out Channel Detection, in Er community 2, working channel and alternate channel are respectively 1, nowNeed to consider the load condition in community 2, if also do not carry out Channel Detection when lighter, if need when heavierCarry out Channel Detection, to apply for resource according to testing result to channel management entity 10. In like manner to channelBunches 4 detection too.
As shown in Figure 8, be in one embodiment of the invention, in cluster of channels, to comprise cell operation channel and alternate channelTime frequency spectrum detecting method flow chart.
In Fig. 8, when cluster of channels 1 is carried out to Channel Detection, the working channel 1 and 3 in community 1 is positioned atFrequency spectrum perception flow process in cluster of channels 1:
Step 801, in community 1, first judge whether need to be to each channel in cluster of channels 1 for CBS30Detect. Now for detecting.
Step 802, the CBS30 in community 1 sends to the CU30 in community the letter of carrying out frequency spectrum perceptionOrder, comprises the cluster of channels number that need to detect.
Step 803, in community 1, CU30 is receiving after the signaling of frequency spectrum perception, in cluster of channels 1When quiet period, the channel in cluster of channels 1 is detected, now CBS30 needs to carry out frequency spectrum inspection tooSurvey operation.
Step 804, after the quiet period of cluster of channels 1 finishes, CU20 reports the result of perception to community 1In CBS30.
Step 805, CBS30 carries out the sensing results receiving to send to channel management after aggregation processEntity 10.
Step 806, channel management entity 10 utilizes each channel in institute's acquired information renewal cluster of channels 1 to existStatus information in community 1, and carry out corresponding operation according to the variation of channel status.
As shown in Figure 9, the frequency spectrum detecting method flow process while being one embodiment of the invention small area inadequate resourceFigure.
In Fig. 9, while having described the inadequate resource distributing for current area, carry out frequency spectrum detection operation, withCommunity 2 is detected as example cluster of channels 3, and flow process is:
Step 901, in community 2, CBS30 judgement need to detect each channel in cluster of channels 3.
Step 902, in community 2, CBS30 sends to the CU20 in community the signaling of carrying out frequency spectrum perception.
Step 903, the CU in community 2 receives after the signaling of frequency spectrum perception, quiet in cluster of channels 3When the silent phase, the channel in cluster of channels 3 is detected.
Step 904, after the quiet period of cluster of channels 3 finishes, CU20 reports the result of perception to community 2In CBS30.
Step 905, the CBS30 in community 2 will send to letter after the sensing results aggregation process receivingRoad management entity 10 is also applied for frequency spectrum resource to it.
Step 906, channel management entity 10 utilizes each channel in obtained information updating cluster of channels 3Status information in community 2, and determine according to the channel behaviour in service of channel condition information and neighbor cellWhether be that new resource is distributed in community 2, if all channels in cluster of channels 3 can not be used by community 2,In the time of cluster of channels 4, frequency spectrum detection operation is continued to carry out in community 2.
The present invention has following features:
1, when carrying out frequency spectrum perception, adopt " unified arrangement, detects as required " thought, unified being arranged inIn CR system, the channel of required detection is formulated to unified quiet period configuration, detect as required and whether to be in factExecuting detection is to be determined according to the situation of community by CBS30.
2, CBS30 makes according to the situation of working channel, alternate channel and cell business volume in current areaWhether carry out the decision-making of Channel Detection.
3, channel management entity 10 completes the division of subchannel and cluster of channels, each in same cluster of channelsChannel adopts the synchronize quiet phase, and the channel between different channels bunch adopts asynchronous quiet period.
4, channel management entity 10 is in charge of the status information of channel in each community, and channel status comprisesWork, for subsequent use and unavailable.
5, in the time that community available channel is not enough, CBS30 after frequency spectrum perception to channel management entity 10Apply for new resource, if do not meet the demands, in next cluster of channels, proceed Channel Detection orUntil continuous several times stops its resource bid by channel management entity 10 while still not having resource available.
6, channel management entity 10 completes the resource of each community of CR system and distributes, and believes at channel statusThe execution of controlling CBS30 when breath changes operates accordingly.
Thought based on " unified arrangement, detects as required " in this programme, completes CR by channel management entityThe quiet period configuration of system, and considered while carrying out frequency spectrum perception in each community the working channel in community,The situation of alternate channel and portfolio, and determine that with this whether current area carries out frequency spectrum perception operation, passes throughDistinguish different situations and avoid unnecessary frequency spectrum perception, and then reduce the detection number of times of entire system, reduceThe energy consumption of bringing due to frequency spectrum detection.
Certainly, the present invention also can have other various embodiments, in the feelings that do not deviate from spirit of the present invention and essence thereofUnder condition, those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, butThese corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (6)
1. towards a low-power consumption multichannel frequency spectrum sensing method for cellular communications networks, it is characterized in that,Comprise:
Step 1, the shared frequency spectrum that channel management entity selection present cognitive radio system uses, and willThis shared spectrum division is multiple channels;
Step 2, channel management entity is multiple cluster of channels at frequency domain by multiple channel distribution, works as frequency spectrum perceptionTime the channel in different channels bunch is adopted to asynchronous quiet period, adopt synchronously quiet to the channel in same cluster of channelsThe silent phase;
Step 3, during quiet period, cognitive user terminal completes corresponding current according to the control of cognitive base stationFrequency spectrum perception operation in community, and sensing results is reported to cognitive base station, by cognitive base station, perception is tiedFruit is reported to channel management entity after integrating;
Step 4, channel management entity, according to the sensing results after integrating, upgrades current all channels at eachThe status information of community, and feed back to cognitive base station;
In described step 3, comprising:
Mourning in silence according to the working channel of current area, alternate channel and traffic case in described cognitive base stationDuring phase, dispose as required the frequency spectrum perception operation in community;
Described cognitive base station judges according to the load condition of current area whether current area needs to carry out frequency spectrumSense operation, if desired carries out frequency spectrum perception operation, sends and holds to the cognitive user terminal in current areaThe signaling of line frequency spectrum sense operation, carries out frequency spectrum perception operation if do not need, and notifies recognizing in current areaKnow that user terminal does not carry out frequency spectrum perception operation.
2. low-power consumption multichannel frequency spectrum sensing method according to claim 1, is characterized in that instituteState in step 1, comprising:
Described channel management entity is working channel, alternate channel and not according to the state of channel by channel distributionAvailable channel.
3. low-power consumption multichannel frequency spectrum sensing method according to claim 1, is characterized in that instituteState in step 3, comprising:
When working channel or the alternate channel that need to carry out the cluster of channels of frequency spectrum perception and comprise current area, rightFrequency spectrum perception operation need to be carried out in this community, notifies cognitive user terminal in current area in the time of quiet periodWorking channel or alternate channel are detected; Or
When not comprising working channel and the alternate channel of current area in the cluster of channels that need to carry out frequency spectrum perception,Determine whether to carry out frequency spectrum perception operation according to the load condition of current area:
A, work at present channel meet the business demand of community and alternate channel when more, do not need to carry outFrequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out frequency spectrum senseKnow operation, transfer part alternate channel to working channel as required;
C, when working channel and alternate channel less, but the portfolio of community is when little, current area does not needCarry out frequency spectrum perception operation, otherwise need to carry out frequency spectrum perception operation, and report money to channel management entityApply in source, if application is not to enough resources, once proceeds frequency spectrum perception operation or work as continuously upperWhen repeatedly frequency spectrum perception cannot obtain new resource, stop local resource application by channel management entity.
4. towards a low-power consumption multichannel frequency spectrum perception system for cellular communications networks, it is characterized in that,Comprise: channel management entity, cognitive base station and the cognitive user terminal of serving;
Channel management entity, for the shared frequency spectrum of selecting present cognitive radio system to use, and shouldShared spectrum division is multiple channels, is multiple cluster of channels at frequency domain by multiple channel distribution, works as frequency spectrum perceptionTime the channel in different channels bunch is adopted to asynchronous quiet period, adopt synchronously quiet to the channel in same cluster of channelsThe silent phase, the sensing results gathering according to cognitive base station, upgrades the state letter of current all channels in each communityBreath, and feed back to cognitive base station;
Cognitive user terminal, for completing the frequency spectrum perception in corresponding current area according to the control of cognitive base stationOperation, and sensing results is reported to cognitive base station;
Cognitive base station, is responsible for the use of share spectrum resources in community, after sensing results is integrated, reports to letterRoad management entity;
Mourning in silence according to the working channel of current area, alternate channel and traffic case in described cognitive base stationDuring phase, dispose as required the frequency spectrum perception operation in community;
Described cognitive base station judges according to the load condition of current area whether current area needs to carry out frequency spectrumSense operation, if desired carries out frequency spectrum perception operation, sends and holds to the cognitive user terminal in current areaThe signaling of row frequency spectrum perception, carries out frequency spectrum perception operation if do not need, and notifies the cognition in current area to useFamily terminal is not carried out frequency spectrum perception operation.
5. low-power consumption multichannel frequency spectrum perception system according to claim 4, is characterized in that instituteStating channel management entity is working channel, alternate channel and unavailable letter according to the state of channel by channel distributionRoad.
6. low-power consumption multichannel frequency spectrum perception system according to claim 4, is characterized in that instituteState cognitive base station also for:
When working channel or the alternate channel that need to carry out the cluster of channels of frequency spectrum perception and comprise current area, rightFrequency spectrum perception operation need to be carried out in this community, notifies cognitive user terminal in current area in the time of quiet periodWorking channel or alternate channel are detected; Or
When not comprising working channel and the alternate channel of current area in the cluster of channels that need to carry out frequency spectrum perception,Determine whether to carry out frequency spectrum perception operation according to the load condition of current area:
A, work at present channel meet the business demand of community and alternate channel when more, do not need to carry outFrequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out frequency spectrum senseKnow operation, transfer part alternate channel to working channel as required;
C, when working channel and alternate channel less, but the portfolio of community is when little, current area does not needCarry out frequency spectrum perception operation, otherwise need to carry out frequency spectrum perception operation, and report money to channel management entityApply in source, if application is not to enough resources, once proceeds frequency spectrum perception operation or work as continuously upperWhen repeatedly frequency spectrum perception cannot obtain new resource, stop local resource application by channel management entity.
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