CN103476037A - Low-power-loss multi-channel spectrum sensing method and system facing cellular communication network - Google Patents
Low-power-loss multi-channel spectrum sensing method and system facing cellular communication network Download PDFInfo
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Abstract
The invention discloses a low-power-loss multi-channel spectrum sensing method and system facing a cellular communication network. The method comprises the steps that first, a channel management entity selects a shared spectrum which is divided into a plurality of channels; second, the channel management entity divides the channels into a plurality of channel clusters in a frequency domain, during spectrum sensing, an asynchronization silent period is used for channels in different channel clusters, a synchronization silent period is used for channels in the same channel cluster; third, during the silent period, a cognition user terminal completes corresponding spectrum sensing operation in a current cell according to control of a cognitive base station, sensing results are reported to the cognitive base station, the cognitive base station integrates the sensing results and reports the sensing results to the channel management entity; fourth, the channel management entity refreshes state information of all of the current channels in each cell according to the integrated sensing results and feeds the information back to the base station. The frequency of spectrum sensing by the system is reduced, and accordingly power loss is lowered.
Description
Technical field
The present invention relates to cognitive radio networks, particularly relate to the method and system that carries out low-power consumption multichannel frequency spectrum perception in the cellular communications networks based on cognitive radio.
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 may policy causes some frequency range utilance on time and space not high.Cognitive radio (Cognitive Radio, CR) proposition purpose is by the perception to the current wireless electrical environment, from time and the idle frequency spectrum of space re-using, solve current wireless communication network intermediate frequency spectrum resource anxiety and the low problem of frequency spectrum resource utilization rate, main research is how on the basis that does not affect the authorized user proper communication, utilize idle frequency spectrum to communicate to the chance formula, meet the service needed of cognitive user and improve the availability of frequency spectrum.
In the CR system, the user that share spectrum resources is provided is authorized user (Primary User, PU), the system at its place is authoring system, it is cognitive user (Cognitive User that chance formula ground utilizes the user who shares frequency spectrum hollow ideler frequency spectrum resource, CU), the system at its place is cognitive system (CR system).Shared frequency spectrum refers to that distributing to authoring system in fixing spectrum allocation may policy uses, and other system does not allow the frequency spectrum used simultaneously, and idle frequency spectrum is also frequency spectrum cavity-pocket, is the untapped frequency spectrum resource that can be used by CU of authorized user.In order to protect authorized user and effectively to utilize idle frequency spectrum; the CR system need to be carried out perception to channel; to detect authorized user, whether on this channel, occur; perception is by cognitive base station (Cognitive Base Station; CBS) with CU, cooperated, gathering with spectrum allocation may of testing result completed by CBS or other entity.
As CBS and CU, during to corresponding channel-aware, the CU be operated on this channel need to keep mourning in silence of a period of time, with the communication that guarantees CU, can not impact sensing results, is called during this period of time quiet period.Quiet period can be divided into two kinds by implementation: synchronize quiet phase and asynchronous quiet period, and interim in synchronize quiet, all CU in the CR system stop sending data at one time, and the CR system completes the detection to all channels; In asynchronous quiet period, the quiet period of different channels can be not in the same time, each test section channel, and CU only need stop transmitting data on the channel detected, and can continue to transmit data on other channel.
In order to complete multi channel frequency spectrum perception in cellular network, in existing CR technology, the different quiet period of the distribution that the CR system is different operating channel in system adopts the method for asynchronous quiet period, CBS and CU have the function of Channel Detection, in given quiet period, corresponding channel is detected respectively, the CBS and the CU that are operated on this channel temporarily stop at this channel data, and the CBS and the CU that are not operated on this channel only need to be detected this channel.After detecting end, CU sends to affiliated CBS by sensing results, and then the CR system is upgraded state information and the channel allocation information of current channel according to testing result.
In existing technical scheme, when each channel during in quiet period, CBS in network and CU need to be detected this channel, produce a large amount of power consumptions during due to detection, for conventional wireless communication network, 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.The actual conditions of simultaneously when channel is carried out to frequency spectrum perception, not considering each community judge whether that the Gai community need to carry out corresponding frequency spectrum perception, with the detection number of times that reduces system to reduce energy consumption.
Summary of the invention
The object of the present invention is to provide a kind of multichannel of the low-power consumption towards cellular communications networks frequency spectrum sensing method and system thereof, for authorized user being disturbed avoiding as far as possible by taking full advantage of at cognitive radio system to share again and again, and the minimizing system is carried out the number of times of frequent perception, the power consumption of reduction CU and CBS.
To achieve these goals, the invention provides a kind of multichannel of the low-power consumption towards cellular communications networks frequency spectrum sensing method, it is characterized in that, comprising:
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 unavailable channel according to the state of channel by channel distribution.
Described low-power consumption multichannel frequency spectrum sensing method wherein, in described step 3, comprising:
Described cognitive base station operates in the frequency spectrum perception of disposing as required during quiet period in community according to working channel, alternate channel and the traffic case of current area.
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 the frequency spectrum perception operation, if need to carry out the frequency spectrum perception operation, to the cognitive user terminal in current area, send the signaling of carrying out the frequency spectrum perception operation, do not carry out the frequency spectrum perception operation if do not need, notify the cognitive user terminal in current area not carry out the frequency spectrum perception operation.
Described low-power consumption multichannel frequency spectrum sensing method wherein, in described step 3, comprising:
When needs carry out working channel or the alternate channel that the cluster of channels of frequency spectrum perception comprises current area, the frequency spectrum perception operation need to be carried out in the Ze Duigai community, notifies the cognitive user terminal in current area when quiet period, working channel or alternate channel to be detected; Or
The working channel and the alternate channel that do not comprise current area in needs carry out the cluster of channels of frequency spectrum perception determine whether to carry out the 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 out the frequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out the frequency spectrum perception operation, transfers the part alternate channel to working channel as required;
C, when working channel and alternate channel less, but when the traffic carrying capacity of community is little, current area does not need to carry out the frequency spectrum perception operation, otherwise need to carry out the frequency spectrum perception operation, and report resource bid to the channel management entity, if application is not to enough resources, upper, once proceed the frequency spectrum perception operation or, when the continuous several times frequency spectrum perception can't obtain new resource, by the channel management entity, stop the local resource application.
To achieve these goals, the present invention also provides a kind of multichannel of the low-power consumption towards cellular communications networks frequency spectrum perception system, it is characterized in that, comprising: channel management entity, cognitive base station and the cognitive user terminal of serving;
The channel management entity, for the shared frequency spectrum of selecting the present cognitive radio system to use, and should to share spectrum division be a plurality of channels, at frequency domain, by each channel distribution, be a plurality of cluster of channels, when frequency spectrum perception, the channel in different channels bunch is adopted to asynchronous quiet period, the channel in same cluster of channels is adopted to synchronize quiet phase, the sensing results gathered according to cognitive base station, upgrade the state information of current all channels in each community, and feed back to cognitive base station;
The cognitive user terminal, complete the frequency spectrum perception operation in corresponding current area for the control according to cognitive base station, and sensing results reported to cognitive base station;
Cognitive base station, be responsible for the use of share spectrum resources in community, after sensing results is integrated, reports to the channel management entity.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described channel management entity is working channel, alternate channel and unavailable channel according to the state of channel by channel distribution.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station operates in the frequency spectrum perception of disposing as required during quiet period in community according to working channel, alternate channel and the traffic case of current area.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station judges according to the load condition of current area whether current area needs to carry out the frequency spectrum perception operation, if need to carry out the frequency spectrum perception operation, to the cognitive user terminal in current area, send the signaling of carrying out frequency spectrum perception, do not carry out the frequency spectrum perception operation if do not need, notify the cognitive user terminal in current area not carry out the frequency spectrum perception operation.
Described low-power consumption multichannel frequency spectrum perception system, wherein, described cognitive base station also for:
When needs carry out working channel or the alternate channel that the cluster of channels of frequency spectrum perception comprises current area, the frequency spectrum perception operation need to be carried out in the Ze Duigai community, notifies the cognitive user terminal in current area when quiet period, working channel or alternate channel to be detected; Or
The working channel and the alternate channel that do not comprise current area in needs carry out the cluster of channels of frequency spectrum perception determine whether to carry out the 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 out the frequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out the frequency spectrum perception operation, transfers the part alternate channel to working channel as required;
C, when working channel and alternate channel less, but when the traffic carrying capacity of community is little, current area does not need to carry out the frequency spectrum perception operation, otherwise need to carry out the frequency spectrum perception operation, and report resource bid to the channel management entity, if application is not to enough resources, upper, once proceed the frequency spectrum perception operation or, when the continuous several times frequency spectrum perception can't obtain new resource, by the channel management entity, stop the local resource application.
Compared with prior art, useful technique effect of the present invention is:
The invention provides a kind of method and system of the multichannel of the low-power consumption towards cognitive radio cellular communications networks frequency spectrum perception, it is classified according to channel status, and according to the concrete condition of cell load, in conjunction with dissimilar channel quantity, judge whether to carry out the frequency spectrum perception operation, reduce the frequency spectrum perception number of times to reduce power consumption.
The accompanying drawing explanation
Fig. 1 is the low-power consumption multichannel frequency spectrum sensing method overall flow figure of the present invention towards cellular communications networks;
Fig. 2 is the low-power consumption multichannel frequency spectrum perception entire system structure chart of the present invention towards cellular communications networks;
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 spectrum detecting method flow chart while in one embodiment of the invention, comprising cell operation channel and alternate channel in cluster of channels;
Frequency spectrum detecting method flow chart when Fig. 9 is one embodiment of the invention small area inadequate resource.
Embodiment
Below in conjunction with the drawings and specific embodiments, describe the present invention, but not as a limitation of the invention.
As shown in Figure 1, be the low-power consumption multichannel frequency spectrum sensing method overall flow figure of the present invention towards cellular communications networks, this flow process comprises:
Step 101, the shared frequency spectrum that channel management entity 10 selects current systems to use, and will to share spectrum division be some channels, according to the state of channel, is divided into working channel, alternate channel and unavailable channel.
Step 102, channel management entity 10 is some cluster of channels by channel distribution, and channel during frequency spectrum perception in different channels bunch adopts asynchronous quiet period, and the channel in same cluster of channels adopts the synchronize quiet phase.
Step 104, channel management entity 10, according to the sensing results gathered, upgrades the state information of current all channels in each community, feeds back to each CBS30 simultaneously.
As shown in Figure 2, be the low-power consumption multichannel frequency spectrum perception entire system structure chart of the present invention towards cellular communications networks.This system 200 comprises: channel management entity 10, CU20, CBS30.
CU20, carry out the frequency spectrum perception operation for the quiet period mechanism according to CBS30 to channel, and result reported to CBS30.
CBS30, be responsible for the use of share spectrum resources in community, the frequency spectrum perception operation in CBS30 and CU20 Dui Qi community, and after perception completes, CU20 reports to CBS30, and CBS30 reports to channel management entity 10 after sensing results is integrated.
In the present invention, channel management entity 10 is divided into some cluster of channels by subchannel, and the channel in frequency spectrum perception different channels bunch adopts the asynchronous silent phase, and the channel in same cluster of channels adopts the synchronize quiet phase; CBS30 is according to the situation of current area working channel, alternate channel and cell business volume, dispose as required the frequency spectrum perception operation in community when quiet period, to realize taking full advantage of shared frequency spectrum in cognitive radio system, when avoiding as far as possible the authorized user interference, the minimizing system is carried out the number of times of frequency spectrum perception, reduces the 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 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.
In Fig. 3, shared frequency spectrum is the frequency range that the channel management entity is the system choice for use, be divided into 1～12 sub-channels and be divided into some cluster of channels according to system bandwidth, 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 are detected frequency spectrum, the report phase is the period that sensing results was reported and processed to base station and terminal, the period that transmission period is base station and the transmitting-receiving of terminal normal data, the quiet period position of different channels bunch is in the different moment, therefore report phase and transmission period are backward also along moving, for alternate channel and unavailable channel, transmission period does not have transfer of data simultaneously.
In Fig. 5, the quiet period mechanism of each channel in individual channel bunch has been described, the implication in itself and Fig. 4 is similar, and in this figure individual channel bunch, the quiet period of each channel is in the identical moment simultaneously.
As shown in Figure 6, in the method provided in example of the present invention, at least comprise following content:
Step 601, the shared spectrum division that channel management entity 10 is used the present cognitive radio system is some subchannels, according to authorized user, whether occur simultaneously and authorized user while occurring channel whether in community, by CBS30, used be working channel, alternate channel and unavailable channel by channel classification.
Working channel is the channel that current area is being used; Alternate channel is to distribute to current area but the channel that do not used by current area, when make a concession scene or cell load at frequency spectrum, changes working channel into when heavier, and when cell load is lighter, alternate channel can be discharged and use for other communities by current area; Unavailable channel refers to the channel except working channel and alternate channel, therefore this local channel can be by CBS30 to 10 applications of channel management entity when the CBS alternate channel is not enough, its state will become stand-by state by down state in community, while on working channel, authorized user occurring, its state becomes unavailable channel, when due to authorized user, occurring causing working channel unavailable and the working channel that uses while increasing of current area traffic carrying capacity can not meet the condition such as business demand the time, alternate channel becomes working channel.The state of channel in community also depends on the state of channel at neighbor cell, as channel A in community 1 is working channel, in neighbor cell 2, channel A is down state, and no matter now whether authorized user occurs on channel A, while only in community 2, there is no other any available channel, channel A just can become working 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 be take channel bunch as unit and is divided into some cluster of channels, and be that cluster of channels is distributed quiet period according to the sequence number order from low to high of cluster of channels, the channel in different channels bunch adopts asynchronous quiet period, and the channel in same cluster of channels adopts the synchronize quiet phase.
One of purpose of dividing cluster of channels is to be convenient to carry out the configuration of quiet period, the number of channel comprised in individual channel bunch is relevant with the spectral bandwidth that equipment can detect at every turn with the bandwidth of channel, must guarantee while distributing quiet period that in certain cluster of channels other all cluster of channels must be tested during again in quiet period.Therefore the quiet period that belongs to each channel in same cluster of channels can be in synchronization, and what adopt is the synchronize quiet 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 judge according to the load condition of current area whether current area needs to carry out the frequency spectrum perception operation, the CBS30 that need to carry out frequency spectrum perception sends to the CU30 in community the signaling of carrying out frequency spectrum perception, the CBS30 that does not need the to carry out frequency spectrum perception CU30 in notifying cell does not carry out frequency spectrum perception, and this signaling comprises the channel that whether carries out frequency spectrum perception and need perception.
Be specially: if need to carry out working channel or the alternate channel that the cluster of channels of perception comprises CBS30 when quiet period, the frequency spectrum perception operation need to be carried out in the Ze Gai community, the CBS30 interior CU30 of notifying cell is detected working channel or alternate channel when quiet period, if also have other channel in cluster of channels, CBS30 judges whether other channel is detected according to the load condition of community.
If need to 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 the frequency spectrum perception operation according to the load condition of current area, and situation is divided into:
(1). the work at present channel meets the business demand of community and alternate channel when more, do not need to carry out the frequency spectrum perception operation, the CU30 in the CBS30 notifying cell does not carry out frequency spectrum perception, when reporting, CBS30 reports current area to channel management entity 10 and does not carry out the frequency spectrum perception operation, and release portion alternate channel according to circumstances;
(2). work at present channel deficiency, but when alternate channel is more, current area does not need to carry out the frequency spectrum perception operation yet, transfers the part alternate channel to working channel as required;
. when working channel and alternate channel all less, when but the traffic carrying capacity of community is not very large, current area does not need to carry out the frequency spectrum perception operation, otherwise need to carry out the frequency spectrum perception operation, and report resource bid to channel management entity 10, if application does not obtain enough resources, upper, once proceed described operation or when the continuous several times frequency spectrum perception also can't obtain new resource, stop the local resource application by channel management entity 10, stop allowing again it to carry out resource bid after a period of time;
(4). also have a kind of special circumstances, channel must be detected once in certain time interval T Nei Bei community, to upgrade the state of channel in community.It is tested that as supposed, channel A does not have in duration T in community 1, and the cluster of channels at upper once its place need to be detected channel A in quiet period Shi， community 1.
For the measurement to above-mentioned several situations, the working channel number of definition current area is N, and the alternate channel number is M, and the traffic carrying capacity that current area need to be transmitted is S, and the channel capacity of working channel N is C
n(n=1 ..., N), C
minfor C
nin minimum value, P
low, P
highfor the average service rate of cell spectrum resource in a period of time T, for weighing cell load situation, P
lowfor weighing the lighter threshold value of cell load, P
highfor weighing the heavier threshold value of cell load, can be divided into:
(1) when
the time, the some work channel is converted into to alternate channel, make
to ensure higher frequency spectrum resource utilization rate, simultaneously in order to guarantee that alternate channel can be not too much, the number that limits alternate channel is 3, and remaining discharges for other communities uses.Now current area only needs testing channel and alternate channel, does not need other channels are detected.N
leftmean the cognitive frequency spectrum number that current base station is used, N
releasemean to need the channel number discharged.
(2) when
the time, current testing channel and the alternate channel of only needing.
(3) when
the time, at first consider to transfer alternate channel to working channel, if can meet
do not need to apply for resource, if while meeting this condition, the alternate channel number is 0, needs the resource new to 10 applications of channel management entity and need to constantly carry out frequency spectrum perception at next, take and guarantee that alternate channel is not 0; If
still need to carry out frequency spectrum perception to obtain extra frequency spectrum resource for current area.
Realize that frequency spectrum perception is by the arrangement of CR systematic unity, the purpose of perception detects authorized user and obtains new resource, whether carry out frequency spectrum detection and determined by each CBS30, operate to reduce frequency spectrum detection number of times and the power consumption of entire system by reducing unnecessary frequency spectrum detection.
Step 604, after CU30 receives the signaling of frequency spectrum perception, carry out the frequency spectrum perception operation in quiet period to corresponding channel.
Below in conjunction with specific embodiment, technical scheme of the present invention is described in detail:
Suppose that the working channel in community 1 is 1,3,4, alternate channel is 6,10; Working channel in community 2 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 out the frequency spectrum perception operation.
In the working channel that need to be detected to the channel in cluster of channels 1 Shi， community 1,1 and 3 are arranged in cluster of channels 1, thereby community 1 need to be detected the channel in cluster of channels 1 when quiet period, and in like manner community 2 also needs to carry out Channel Detection; Working channel 4 in need to being detected Shi， community 1 to cluster of channels 2 is arranged in cluster of channels 2, thereby community 1 need to be carried out in Channel Detection ，Er community 2 alternate channel 5 and is positioned at cluster of channels 2 Zhong， communities 2 and also needs to carry out Channel Detection; When needs are detected cluster of channels 3, now in community 1, working channel and alternate channel are more, can meet the business demand of current area, thereby do not carry out in Channel Detection ，Er community 2, working channel and alternate channel are respectively 1, now just need to consider the load condition in community 2, if do not carry out Channel Detection when lighter yet, if need to carry out Channel Detection when heavier, with according to testing result to channel management entity 10 application resources.In like manner to the detection of cluster of channels 4 too.
As shown in Figure 8, be the frequency spectrum detecting method flow chart while in one embodiment of the invention, comprising cell operation channel and alternate channel in cluster of channels.
In Fig. 8, cluster of channels 1 is carried out to the frequency spectrum perception flow process that working channel 1 and 3 in Channel Detection Shi， community 1 is arranged in cluster of channels 1:
In step 801， community 1, at first CBS30 judges whether need to each channel in cluster of channels 1 be detected.Now for being detected.
CBS30 in step 802， community 1 sends to the CU30 in community the signaling of carrying out frequency spectrum perception, comprises the cluster of channels number that need to be detected.
In step 803， community 1, CU30, after receiving the signaling of frequency spectrum perception, is detected the channel in cluster of channels 1 when the quiet period of cluster of channels 1, and now CBS30 needs to carry out the frequency spectrum detection operation too.
Step 804, after the quiet period of cluster of channels 1 finishes, CU20 reports the result of perception to the CBS30 in community 1.
Step 805, CBS30 carries out the sensing results received to send to channel management entity 10 after aggregation process.
Frequency spectrum detecting method flow chart while as shown in Figure 9, being one embodiment of the invention small area inadequate resource.
In Fig. 9, to carry out 2 pairs of ，Yi communities of frequency spectrum detection operation cluster of channels 3 while having described the inadequate resource distributed for current area and detect as example, flow process is:
In step 901， community 2, the CBS30 judgement need to be detected each channel in cluster of channels 3.
In step 902， community 2, CBS30 sends to the CU20 in community the signaling of carrying out frequency spectrum perception.
After CU in step 903， community 2 receives the signaling of frequency spectrum perception, when the quiet period of cluster of channels 3, 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 the CBS30 in community 2.
CBS30 in step 905， community 2 will send to channel management entity 10 and apply for frequency spectrum resource to it after the sensing results aggregation process received.
The present invention has following features:
1, when carrying out frequency spectrum perception, adopt " the unified arrangement, detect as required " thought, unified arrange to be that the CR system formulates unified quiet period configuration to the channel of required detection, detect and be whether examinations is determined according to the situation of community by CBS30 as required.
2, CBS30 makes whether carrying out the decision-making of Channel Detection according to the situation of working channel, alternate channel and cell business volume in current area.
3, channel management entity 10 completes the division of subchannel and cluster of channels, and each channel in same cluster of channels adopts synchronize quiet phase, and the channel between different channels bunch adopts asynchronous quiet period.
4, channel management entity 10 is in charge of the state information of channel in each community, and channel status comprises work, standby and unavailable.
5, when the community available channel is not enough, CBS30 applies for new resource to channel management entity 10 after frequency spectrum perception, if do not meet the demands, in next cluster of channels, proceed Channel Detection or until continuous several times does not stop its resource bids by channel management entity 10 while still having resource available.
6, channel management entity 10 completes the resource of each community of CR system and distributes, and the execution of controlling CBS30 when channel condition information changes operates accordingly.
Thought based on " the unified arrangement; detect as required " in this programme, completed the quiet period configuration of CR system by the channel management entity, and considered the situation of the working channel in the community, alternate channel and traffic carrying capacity while in each community, carrying out frequency spectrum perception, and determine with this whether current area carries out the frequency spectrum perception operation, avoid unnecessary frequency spectrum perception by distinguishing different situations, and then reduce the detection number of times of entire system, reduce the energy consumption of bringing due to frequency spectrum detection.
Certainly; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the multichannel of the low-power consumption towards a cellular communications networks frequency spectrum sensing method, is characterized in that, comprising:
Step 1, the shared frequency spectrum that channel management entity selection present cognitive radio system is used, and should to share spectrum division be a plurality of channels;
Step 2, the channel management entity is a plurality of cluster of channels at frequency domain by each channel distribution, when 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, the 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 the channel management entity;
Step 4, the channel management entity, according to the sensing results after integrating, upgrades the state information of current all channels in each community, and feeds back to cognitive base station.
2. low-power consumption multichannel frequency spectrum sensing method according to claim 1, is characterized in that, in described step 1, comprising:
Described channel management entity is working channel, alternate channel and unavailable channel according to the state of channel by channel distribution.
3. low-power consumption multichannel frequency spectrum sensing method according to claim 1 and 2, is characterized in that, in described step 3, comprising:
Described cognitive base station operates in the frequency spectrum perception of disposing as required during quiet period in community according to working channel, alternate channel and the traffic case of current area.
4. low-power consumption multichannel frequency spectrum sensing method according to claim 3, is characterized in that, 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 the frequency spectrum perception operation, if need to carry out the frequency spectrum perception operation, to the cognitive user terminal in current area, send the signaling of carrying out the frequency spectrum perception operation, do not carry out the frequency spectrum perception operation if do not need, notify the cognitive user terminal in current area not carry out the frequency spectrum perception operation.
5. low-power consumption multichannel frequency spectrum sensing method according to claim 4, is characterized in that, in described step 3, comprising:
When needs carry out working channel or the alternate channel that the cluster of channels of frequency spectrum perception comprises current area, the frequency spectrum perception operation need to be carried out in the Ze Duigai community, notifies the cognitive user terminal in current area when quiet period, working channel or alternate channel to be detected; Or
The working channel and the alternate channel that do not comprise current area in needs carry out the cluster of channels of frequency spectrum perception determine whether to carry out the 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 out the frequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out the frequency spectrum perception operation, transfers the part alternate channel to working channel as required;
C, when working channel and alternate channel less, but when the traffic carrying capacity of community is little, current area does not need to carry out the frequency spectrum perception operation, otherwise need to carry out the frequency spectrum perception operation, and report resource bid to the channel management entity, if application is not to enough resources, upper, once proceed the frequency spectrum perception operation or, when the continuous several times frequency spectrum perception can't obtain new resource, by the channel management entity, stop the local resource application.
6. the multichannel of the low-power consumption towards a cellular communications networks frequency spectrum perception system, is characterized in that, comprising: channel management entity, cognitive base station and the cognitive user terminal of serving;
The channel management entity, for the shared frequency spectrum of selecting the present cognitive radio system to use, and should to share spectrum division be a plurality of channels, at frequency domain, by each channel distribution, be a plurality of cluster of channels, when frequency spectrum perception, the channel in different channels bunch is adopted to asynchronous quiet period, the channel in same cluster of channels is adopted to synchronize quiet phase, the sensing results gathered according to cognitive base station, upgrade the state information of current all channels in each community, and feed back to cognitive base station;
The cognitive user terminal, complete the frequency spectrum perception operation in corresponding current area for the control according to cognitive base station, and sensing results reported to cognitive base station;
Cognitive base station, be responsible for the use of share spectrum resources in community, after sensing results is integrated, reports to the channel management entity.
7. low-power consumption multichannel frequency spectrum perception system according to claim 6, is characterized in that, described channel management entity is working channel, alternate channel and unavailable channel according to the state of channel by channel distribution.
8. according to the described low-power consumption multichannel of claim 6 or 7 frequency spectrum perception system, it is characterized in that, described cognitive base station operates in the frequency spectrum perception of disposing as required during quiet period in community according to working channel, alternate channel and the traffic case of current area.
9. low-power consumption multichannel frequency spectrum perception system according to claim 8, it is characterized in that, described cognitive base station judges according to the load condition of current area whether current area needs to carry out the frequency spectrum perception operation, if need to carry out the frequency spectrum perception operation, to the cognitive user terminal in current area, send the signaling of carrying out frequency spectrum perception, do not carry out the frequency spectrum perception operation if do not need, notify the cognitive user terminal in current area not carry out the frequency spectrum perception operation.
10. low-power consumption multichannel frequency spectrum perception system according to claim 9, is characterized in that, described cognitive base station also for:
When needs carry out working channel or the alternate channel that the cluster of channels of frequency spectrum perception comprises current area, the frequency spectrum perception operation need to be carried out in the Ze Duigai community, notifies the cognitive user terminal in current area when quiet period, working channel or alternate channel to be detected; Or
The working channel and the alternate channel that do not comprise current area in needs carry out the cluster of channels of frequency spectrum perception determine whether to carry out the 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 out the frequency spectrum perception operation;
B, work at present channel deficiency, but alternate channel is when more, and current area does not need to carry out the frequency spectrum perception operation, transfers the part alternate channel to working channel as required;
C, when working channel and alternate channel less, but when the traffic carrying capacity of community is little, current area does not need to carry out the frequency spectrum perception operation, otherwise need to carry out the frequency spectrum perception operation, and report resource bid to the channel management entity, if application is not to enough resources, upper, once proceed the frequency spectrum perception operation or, when the continuous several times frequency spectrum perception can't obtain new resource, by the channel management entity, stop the local resource application.
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