CN104519496B - A kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand - Google Patents
A kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand Download PDFInfo
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- 230000001149 cognitive effect Effects 0.000 title claims abstract description 166
- 238000001228 spectrum Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000019771 cognition Effects 0.000 claims description 41
- 230000006870 function Effects 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 24
- 230000008447 perception Effects 0.000 claims description 23
- 230000003920 cognitive function Effects 0.000 claims description 21
- 230000006798 recombination Effects 0.000 claims description 12
- 238000005215 recombination Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 abstract description 13
- 230000021715 photosynthesis, light harvesting Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
- 238000009432 framing Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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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
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Abstract
The invention discloses a kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand, comprise the following steps：（1）, user classification；（2）, cognitive radio users selection；（3）, cognitive open user's selection（4）, perceive user selection；（5）, frequency spectrum distribution according to need.Secondary user's equipped with switch controllable intelligent module can decide whether to open switch controllable intelligent module according to it to the real-time requirement of frequency spectrum resource.The secondary user's for opening switch controllable intelligent module can be on the premise of primary user's proper communication not be disturbed using mandate frequency spectrum.Remaining secondary user's communicates in unauthorized frequency range.The secondary user's selected section user progress spectrum cognitive of switch controllable intelligent module is being opened by perceiving user's selection algorithm.The problems such as unnecessary equipment cost that secondary user's are present in the effective communication congested problem and conventional cognitive radio network for solving unauthorized frequency range in conventional wireless network of the invention, energy dissipation and equipment complexity.
Description
Technical field
The present invention relates to a kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand, belong to radio network technology neck
Domain.
Background technology
Radio Spectrum Resource is distributed and managed by special radio regulatory organization.Current frequency spectrum distribution is all
It is fixed.Whole frequency spectrum resource is divided into two parts：Authorize frequency spectrum and unlicensed spectrum.Most of frequency spectrum resource all by with
It is used as mandate frequency range, such as television broadcast band.And the resource of unauthorized frequency range is much less, such as fast-developing in the recent period is wireless
Metropolitan Area Network (MAN) (WMAN), WLAN (WLAN) and Wireless Personal Network (WPAN).For the user in unauthorized frequency range,
They need not use licensing to radio regulatory organization application frequency spectrum, so that the commercial value of unauthorized frequency range is able to fully
Exploitation.Due to increasing for the communication equipment in unauthorized frequency range in recent years and application, the communication in unauthorized frequency range is increasingly
In saturation, and the utilization rate of the frequency spectrum resource to authorizing frequency range is extremely low.In summary, frequency spectrum resource is faced with
Such a problem, the i.e. utilization rate of mandate frequency spectrum is very low, and at the same time, the communication in unlicensed spectrum resource is increasingly
It is crowded.In order to solve the above problems, cognitive radio technology arises at the historic moment.Cognitive radio technology is to solve spectrum utilization injustice
A kind of very promising solution for this problem that weighs.In cognitive radio networks, the holder of frequency spectrum is authorized to be called
Primary user, does not distribute and authorizes the user of frequency spectrum to be called secondary user's.Primary user has using the priority for authorizing frequency spectrum.It is secondary
User can not use the mandate frequency spectrum that primary user is using.If primary user is wanted to reuse by awarding that secondary user's are used
When weighing frequency spectrum, secondary user's must vacate mandate frequency spectrum.When secondary user's carry out data transmission on frequency spectrum is authorized, it is necessary to assure
Normal data transfer of the primary user on frequency spectrum is authorized is not disturbed.
For the implementation of cognitive radio technology, the system knot of some cognitive radio networks has been proposed in researchers
Structure.The architecture of these cognitive radio networks can be divided into three major types：Cognitive cellular network, cognitive ad hoc networks are mixed
Close network.In cognitive cellular network, the communication between secondary user's is connected to base station to realize by single-hop transmission.This
Plant communication mode and limit the capacity of system, and add the energy expenditure of secondary user's.In cognitive ad hoc networks, do not have
There is the infrastructure of centralization, packet is usually required by being forwarded to up to its destination node between multiple secondary user's.With
On secondary user's in the architecture mentioned be equipped with cognitive radio module.Cognitive radio module can be in very wide frequency
The mandate frequency spectrum of free time is perceived in section, unemployed mandate frequency spectrum is selected, so that secondary user's are not being done
On the premise of disturbing main user data transmission, carry out data transmission on unemployed mandate frequency spectrum.Cognitive radio module
Huge effort is made in terms of hardware design and signal transacting using needs.Therefore, inherently brought largely to secondary user's
Cost, add the complexity of equipment.Simultaneously as cognitive radio module has the performances such as cognitive and reconstruct, necessarily give
Cognitive radio users bring huge energy dissipation.
It is as follows currently for the research papers of the architecture in cognitive radio networks：
1.Kaigui Bian et al. were in 2011《IEEE INFOCOM》On the article " Asynchronous that delivers
Make in Channel Hopping for Establishing Rendezvous in Cognitive Radio Networks "
The architecture of cognitive radio networks is an opportunistic spectrum sharing network architecture.In this cognitive nothing
In line radio network architecture, secondary user's are equipped with cognition wireless module, all with the right to use for authorizing frequency spectrum.
2.Lanj ie Zhai were in 2012《IEEE Globecom》On article " the Coalition Graph that deliver
Game for Joint Relay Selection and Resource Allocation in Cooperative
The cognitive nothing of OFDMA cooperations of single point-to-multipoint based on infrastructure is used in Cognitive Radio Networks "
Line radio network architecture.This cognitive radio networks architecture includes primary user, cognitive access point and secondary user's.
3.Bin Cao were in 2013《IEEE INFOCOM》On article " the On Optimal that deliver
Used in Communication Strategies for Cooperative Cognitive Radio Networking "
The architecture of cognitive radio networks is made up of a master network and a secondary network.Master network be by primary user and
What one master base station was constituted.Secondary network is made up of secondary user's and secondary access point.
4.Teng Wei et al. were in 2013《IEEE ICC》On article " the Opportunistic Access that deliver
Used in for Cooperative Cognitive Radio Networks with Requirement Constraint "
Cognitive radio networks architecture be by primary user, the composition such as secondary user's and access point.Primary user and secondary user's are logical
The mode for crossing TDMA is communicated with access point.
5.Hao Yue et al. were in 2013《IEEE JOURNAL ON SELECTED AREAS IN
COMMUNICATIONS》On article " the Spectrum and Energy Efficient Relay Station that deliver
The complicated CCH architectures of its proposition are extended in Placement in Cognitive Radio Networks ".CCH bodies
Architecture includes the entity of four types：One SSP (secondary ISP), BSs (base station), RSs (relay station) and secondary
Level user.SSP is an independent Wireless Service Provider, and it possesses the frequency spectrum of oneself.It is the electricity by high speed between base station
Cable connection, secondary user's can be communicated with base station, to be further attached with internet or other data networks.
Accessed for the ease of secondary user's, SSP deploys many RSs.BSs and RSs are equipped with cognitive radio module.Secondary user's
It is that the equipment that can use any access technology accesses BS or RS.BSs and RSs possess cognitive function, can use mandate frequency spectrum
Communication between progress.Secondary user's do not have cognitive function, and they can not utilize and authorize frequency spectrum.BSs and RSs is collected can
The spectrum information and the demand for services of secondary user's utilized, then by the information transmission being collected into SSP.SSP collects available
Spectrum information and using frequency spectrum distribute to BSs and RSs by optimal.At the same time, SSP guides secondary user's to be linked into
Router (BSs or RSs) near them.The complexity of secondary user's equipment is converted into the complexity of system design by CCH.
CCH is intended to reduce the complexity and energy loss of secondary user's.However, secondary user's itself can not use mandate frequency spectrum, and
And CCH brings many extra infrastructure to cognitive radio networks.
On the basis of these researchs are summarized, it can be seen that exist in the design of present cognitive radio network architecture
Following subject matter：
1. the architecture of the cognitive radio networks used in many articles all includes infrastructure.The portion of infrastructure
Administration and maintenance can bring huge cost to cognitive radio networks.
2. most of article all thinks that secondary user's all in cognitive radio networks are equipped with cognitive radio module.
However, the secondary user's in cognitive radio networks install cognitive radio module, it will necessarily be brought to secondary user's very big
Equipment is spent, and largely adds the complexity of equipment.The demand side of frequency spectrum is considered from secondary user's, not
It is that all secondary user's all have a mind to install cognitive radio module.
3. most of article all thinks that secondary user's all in cognitive radio networks all carry out frequency spectrum perception.However,
Secondary user's, which carry out frequency spectrum perception, will necessarily consume substantial amounts of energy.Therefore, if secondary user's itself do not have data to need transmission,
Not to the demand for authorizing frequency spectrum to use, in order to save energy, secondary user's are not necessarily to implement cognitive function.
The content of the invention
Technical problem：The present invention designs a kind of cognitive radio networks system knot based on secondary user's spectrum requirement
Secondary user's in structure, the structure can according to its own demand to frequency spectrum resource, itself spend and energy in terms of balance,
Decide whether that switch controllable intelligent module is installed.The secondary user's for installing switch controllable intelligent module can be in real time according to its oneself
Body decides whether to open to the demand of frequency spectrum resource switchs controllable intelligent mould, and final achievement unit point secondary user's use mandate frequency range
Carry out data transmission, the communication mode that part secondary user's are carried out data transmission using unauthorized frequency range.Calculated by perceiving selection
The secondary user's that method selected section in the secondary user's for opening switch controllable intelligent mould meets certain condition carry out cognitive function,
Final achievement unit separates the secondary user's progress cognitive function that breakdown closes controllable intelligent mould, and switch controllable intelligent mould is opened in part
Secondary user's need not carry out cognitive function.So that while conventional wireless network intermediate frequency spectrum is solved using unbalanced problem,
Solve infrastructure unnecessary present in existing cognitive radio networks and equipment is spent, the problems such as energy dissipation.
Technical scheme is as follows：
Secondary user's spectrum requirement distribution method, comprises the following steps in a kind of cognitive radio networks system：
(1), user classifies in network architecture
It is divided into primary user and secondary user's, the secondary user's are divided into cognitive radio users and non-cognitive radio is used
Family, the cognitive radio users equipped with switch controllable intelligent module, switch controllable intelligent module include cognitive function module and
Recombination function module, the non-cognitive radio users are carried out data transmission using unauthorized frequency range, it is not necessary to perform cognitive nothing
The distinctive function of line electricity；
(2), cognitive radio users are selected
Secondary user's calculate its own parameter value, decide whether to install switch controllable intelligent module；Secondary user's are according to being
No switch controllable intelligent module of installing is divided into cognitive radio users and non-cognitive radio users；
(3) it is, cognitive to open user's selection
The parameter value that controllable intelligent module calculates cognitive radio users is switched, cognitive radio users are controllable according to switching
The on off state of intelligent object is divided into cognitive unlatching user and cognitive closing user；
(4) user's selection, is perceived
User is opened in cognition, and by perceiving, user is divided into perception user the choice phase and non-perceives user, if cognitive open is used
Family is chosen as perceiving user perceiving user the choice phase, then opens its cognitive function module and again for switching controllable intelligent module
Structure functional module；If cognition opens user and is not chosen as perceiving user in perception user's choice phase, and is non-perception user,
Then open its recombination function module for switching controllable intelligent module, the cognitive function module of closing switch controllable intelligent module；
(5), frequency spectrum is distributed according to need
Primary user is all using authorizing frequency spectrum to be communicated, and user is opened in cognition can be under particular circumstances using mandate
Frequency spectrum, user is opened in cognition may only use the mandate frequency spectrum not taken by primary user, also, when primary user want to use by
When the mandate frequency spectrum that user uses is opened in cognition, user is opened in cognition must vacate the mandate frequency spectrum used in time, so as to
The normal transmission of primary user is not disturbed, and transmission of the cognition unlatching user on frequency spectrum is authorized, which must assure that, does not disturb primary user awarding
The normal data transfer on frequency spectrum is weighed, user and non-cognitive radio users are closed in cognition can not use mandate frequency spectrum to enter line number
According to transmission, unauthorized frequency range can only be used to be communicated.
The computational methods of secondary user's are as follows in above-mentioned steps (2)：
(a) α S, are calculatedP- β E- γ C, wherein SPThe predicted value of spectral bandwidth for needed for cognitive radio users, E is switch
The predicted value of controllable intelligent module energy consumption, C is installs the cost of switch controllable intelligent module, and α, beta, gamma is SPAnd E, C are each
From weight parameter；
(b) α S, are comparedP- β E- γ C and TaSize, wherein, TaTo judge whether secondary user's install switch controllable intelligent
The threshold value of module, if α SP-βE-γC≥Ta, then switch controllable intelligent module is installed, secondary user's are cognitive radio users；If
αSP- β E- γ C ＜ Ta, switch controllable intelligent module is not installed, secondary user's are non-cognitive radio users.
The computational methods of switch controllable intelligent module are as follows in above-mentioned steps (3)：
(a) λ S- μ ν E, are calculateds-οEr, wherein S spectral bandwidth, E for needed for cognitive radio users are real-timesFor cognition wireless
Electric user performs the predicted value for the energy expenditure that cognitive function can be produced, ErPerforming recombination function for cognitive radio users can produce
The predicted value of raw energy expenditure, ν be cognitive radio users be chosen as perceive user probability, λ, μ, ο be S and Es, ErEach
Weight parameter；
(b) λ S- μ ν E, are compareds-οErWith TtSize, wherein, TtTo judge threshold that whether cognitive radio module opens
Value, if λ S- μ ν Es-οEr≥Tt, then switch controllable intelligent module is opened, cognitive radio users open user to be cognitive；If λ S-
μνEs-οEr＜ Tt, switch controllable intelligent module and be then closed, cognitive radio users close user to be cognitive.
The beneficial effect that the present invention is reached：
(1) the cognitive radio networks architecture based on secondary user's spectrum requirement designed by the present invention is to belong to not
Dependent on the distributed cognitive Ad Hoc networks of infrastructure, there is no any infrastructure, therefore, solve and recognize in the network
Know the unnecessary cost that the deployment and maintenance of infrastructure in radio net are brought；
(2) secondary in the cognitive radio networks architecture based on secondary user's spectrum requirement designed by the present invention
User can decide whether to install switch controllable intelligent module according to own spectrum demand.The design of this network architecture is big
It is big to reduce the complexity for installing unnecessary cost that cognitive radio module brings to secondary user's and equipment；
(3) in the cognitive radio networks architecture based on secondary user's spectrum requirement designed by the present invention, it is equipped with
Switch it is controllable can only module secondary user's can also be decided whether according to own spectrum demand open cognitive radio module, and
And selected section cognition opens user and carries out frequency spectrum perception, greatly reduces all secondary user's and all carries out what frequency spectrum perception was brought
Energy dissipation.
Brief description of the drawings
Fig. 1 is the secondary user's in the cognitive radio networks architecture based on secondary user's spectrum requirement of the present invention
Composition schematic diagram；
Fig. 2 is the cognitive radio networks architectural schematic based on secondary user's spectrum requirement of the invention；
Fig. 3 is the physical platform structure of non-cognitive radio users；
Fig. 4 is the cognitive physical platform structure for closing user；
Fig. 5 is the physical platform structure for perceiving user；
Fig. 6 is the non-physical platform structure for perceiving user；
Fig. 7 switchs controllable intelligence in the cognitive radio networks architecture based on secondary user's spectrum requirement for the present invention
The operation principle flow chart of energy module.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, secondary user's spectrum requirement distribution method in a kind of cognitive radio networks system, including following step
Suddenly：
(1), user classifies in network architecture
It is divided into primary user and secondary user's, the secondary user's are divided into cognitive radio users and non-cognitive radio is used
Family, the cognitive radio users equipped with switch controllable intelligent module, switch controllable intelligent module include cognitive function module and
Recombination function module, the non-cognitive radio users are carried out data transmission using unauthorized frequency range, it is not necessary to perform cognitive nothing
The distinctive function of line electricity；
(2), cognitive radio users are selected
Secondary user's calculate its own parameter value, decide whether to install switch controllable intelligent module；Secondary user's are according to being
No switch controllable intelligent module of installing is divided into cognitive radio users and non-cognitive radio users；
(3) it is, cognitive to open user's selection
The parameter value that controllable intelligent module calculates cognitive radio users is switched, cognitive radio users are controllable according to switching
The on off state of intelligent object is divided into cognitive unlatching user and cognitive closing user；
(4) user's selection, is perceived
User is opened in cognition, and by perceiving, user is divided into perception user the choice phase and non-perceives user, if cognitive open is used
Family is chosen as perceiving user perceiving user the choice phase, then opens its cognitive function module and again for switching controllable intelligent module
Structure functional module；If cognition opens user and is not chosen as perceiving user in perception user's choice phase, and is non-perception user,
Then open its recombination function module for switching controllable intelligent module, the cognitive function module of closing switch controllable intelligent module；
(5), frequency spectrum is distributed according to need
Primary user is all using authorizing frequency spectrum to be communicated, and user is opened in cognition can be under particular circumstances using mandate
Frequency spectrum, user is opened in cognition may only use the mandate frequency spectrum not taken by primary user, also, when primary user want to use by
When the mandate frequency spectrum that user uses is opened in cognition, user is opened in cognition must vacate the mandate frequency spectrum used in time, so as to
The normal transmission of primary user is not disturbed, and transmission of the cognition unlatching user on frequency spectrum is authorized, which must assure that, does not disturb primary user awarding
The normal data transfer on frequency spectrum is weighed, user and non-cognitive radio users are closed in cognition can not use mandate frequency spectrum to enter line number
According to transmission, unauthorized frequency range can only be used to be communicated.
The computational methods of secondary user's are as follows in above-mentioned steps (2)：
(a) α S, are calculatedP- β E- γ C, wherein SPThe predicted value of spectral bandwidth for needed for cognitive radio users, E is switch
The predicted value of controllable intelligent module energy consumption, C is installs the cost of switch controllable intelligent module, and α, beta, gamma is SPAnd E, C are each
From weight parameter；
(b) α S, are comparedP- β E- γ C and TaSize, wherein, TaTo judge whether secondary user's install switch controllable intelligent
The threshold value of module, if α SP-βE-γC≥Ta, then switch controllable intelligent module is installed, secondary user's are cognitive radio users；If
αSP- β E- γ C ＜ Ta, switch controllable intelligent module is not installed, secondary user's are non-cognitive radio users.
As shown in Fig. 2 the cognitive radio networks architecture proposed by the present invention based on secondary user's spectrum requirement by
Two big networks are constituted：That is master network and secondary network.Spectrum regulatory distributor gear can will authorize distributing to for frequency spectrum fixation primary
Family, primary user is using authorizing frequency spectrum to be communicated, and primary user has the priority for authorizing frequency spectrum to use.The present invention based on secondary
Mandate frequency spectrum in the cognitive radio networks architecture of level user's spectrum requirement is only in situation about not taken by primary user
Under, cognition is opened user and can just used.Also, when primary user is want using the mandate frequency spectrum used by cognitive unlatching user
When, user is opened in cognition must vacate the mandate frequency spectrum used in time, so as not to disturb the normal transmission of primary user.It is cognitive
Open transmission of the user on frequency spectrum is authorized and must assure that the normal data transfer for not disturbing primary user on frequency spectrum is authorized., recognize
MS, which closes user and non-cognitive radio users, can not use mandate frequency spectrum to carry out data transmission, and can only use unauthorized frequency range
Carry out data transmission.
As shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, all secondary user's are all main by RF front-end module, and digital-to-analogue modulus turns
Block is changed the mold, modulation /demodulation module, channel encode-decode module, framing module, data processing module realizes communication function.Respectively
The main distinction of communication module is needed for class secondary user's complete communication：
1. RF front-end module：User is closed in cognition, perceives user, the RF front-end module of non-perception user is except completing
Outside conversion before the broadband rf signal and intermediate-freuqncy signal of different frequency range, in addition it is also necessary to have the ability to assist even individually to complete broadband
The distinctive function of the cognitive radios such as frequency spectrum perception.Cognitive radio spy's functional, which is assisted or is implemented separately, to be leaned on before radio frequency
The peculiar function of cognitive radio in end module realizes what module was completed.The RF front-end module of non-cognitive radio users is not required to
Possess the special functional ability of completion cognitive radio.The peculiar function of cognitive radio in RF front-end module realizes module
It is intelligent to be turned on and off.The peculiar function of cognitive radio that cognition is closed in the RF front-end module of user realizes mould
Block is closed.The peculiar function of cognitive radio of the non-RF front-end module for perceiving user realizes that module is in and opens shape
State, only assists to complete the recombination function in cognitive radio networks.The peculiar function of cognitive radio of perceiving user realizes module
In opening, assist even individually to complete to include the distinctive work(of all cognitive radios such as cognitive function and recombination function
Energy.
2. digital-to-analogue analog-to-digital conversion module, data processing module：User is closed in non-cognitive radio users, cognition, perceives and uses
Family, the digital-to-analogue analog-to-digital conversion module of non-perception user, the effect of data processing module and performance indications are essentially identical.
3. modulation /demodulation module, channel encode-decode module, framing module, switch controllable intelligent module：Non- cognition wireless
The physical platform structure of electric user does not include switch controllable intelligent module.Therefore, the modulatedemodulate mode transfer of non-cognitive radio users
Block, channel encode-decode module, framing module is not controlled by switch controllable intelligent module, it is not necessary to which auxiliary completes cognition wireless
The distinctive function of electricity.User is closed in cognition, perceives user, and the physical platform structure of non-perception user includes switching controllable intelligent
Module.The switch controllable intelligent module that cognition is closed in user is closed, it is not necessary to complete cognitive radio distinctive
Function.Therefore, the cognitive modulation /demodulation module closed in user, channel encode-decode module, framing module is again without auxiliary
Help the completion distinctive function of cognitive radio.The switch controllable intelligent module for perceiving user is in opening, carries out frequency spectrum sense
Know, spectrum analysis, the distinctive function of all cognitive radios such as frequency spectrum judging.Perceive the modulation /demodulation module in user, channel
Coding and decoding module, framing module needs to aid in completing all distinctive functions of cognitive radio.The non-switch for perceiving user can
Control intelligent object and be in semi-open state, without frequency spectrum perception, spectrum analysis, frequency spectrum judging.Non- perception user uses from perception
Family there obtains available spectrum information, and switch controllable intelligent module controls modulatedemodulate mode transfer according to available spectrum information
Block, channel encode-decode module, framing module auxiliary completes parameter and reconstructs the peculiar function of this cognitive radio.
As shown in fig. 7, the cognitive radio networks architecture proposed by the present invention based on secondary user's spectrum requirement
Open controllable intelligent module operation principle as follows：
1. cognitive radio users calculate λ S- μ ν Es-οEr, wherein S spectral bandwidths for needed for cognitive radio users are real-time,
EsThe predicted value for the energy expenditure that cognitive function can be produced, E are performed for cognitive radio usersrPerformed for cognitive radio users
The predicted value for the energy expenditure that recombination function can be produced, ν is the probability that cognitive radio users are chosen as perceiving user, λ, μ, ο
For S and Es, ErRespective weight parameter.Compare λ S- μ ν Es-οErWith TtSize, wherein, TtTo judge cognitive radio module
The threshold value whether opened.If λ S- μ ν Es-οEr≥Tt, then controllable intelligent module is opened；If λ S- μ ν Es-οEr＜ Tt, switch controllable
Intelligent object is then closed.
2. cognition opens user and carries out perceiving user's choice phase.Cognition is opened user and existed by perceiving user's selection algorithm
The perception user that selected section in user meets certain condition is opened in cognition.If cognition opens user and is perceiving user's choice phase
It is chosen as perceiving user, then opens its cognitive function module and recombination function module for switching controllable intelligent module；If cognition is opened
Enable family not to be chosen as perceiving user in perception user's choice phase, and be non-perception user, then open its and switch controllable intelligence
The recombination function module of energy module, the cognitive function module of closing switch controllable intelligent module.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and deformed
Also it should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand, it is characterised in that comprise the following steps：
(1), user classifies in network architecture
It is divided into primary user and secondary user's, the secondary user's are divided into cognitive radio users and non-cognitive radio users, institute
Cognitive radio users are stated equipped with switch controllable intelligent module, switch controllable intelligent module includes cognitive function module and reconstruct work(
Energy module, the non-cognitive radio users are carried out data transmission using unauthorized frequency range, it is not necessary to perform cognitive radio special
Some functions；
(2), cognitive radio users are selected
Secondary user's calculate its own parameter value, decide whether to install switch controllable intelligent module；Secondary user's are according to whether peace
Dress switch controllable intelligent module is divided into cognitive radio users and non-cognitive radio users；
(3) it is, cognitive to open user's selection
The parameter value that controllable intelligent module calculates cognitive radio users is switched, cognitive radio users are according to switch controllable intelligent
The on off state of module is divided into cognitive unlatching user and cognitive closing user；
(4) user's selection, is perceived
User is opened in cognition, and by perceiving, user is divided into perception user the choice phase and non-perceives user, exists if user is opened in cognition
Perceive user to be chosen as the choice phase perceiving user, then open cognitive function module and reconstruct work(that it switchs controllable intelligent module
Can module；If cognition opens user and is not chosen as perceiving user in perception user's choice phase, and is non-perception user, then open
Open its recombination function module for switching controllable intelligent module, the cognitive function module of closing switch controllable intelligent module；
(5), frequency spectrum is distributed according to need
Primary user is all using authorizing frequency spectrum to be communicated, and user is opened in cognition can be under particular circumstances using mandate frequency
Spectrum, user is opened in cognition may only use the mandate frequency spectrum not taken by primary user, also, be recognized when primary user wants to use
When knowing the mandate frequency spectrum that unlatching user uses, user is opened in cognition must vacate the mandate frequency spectrum used in time, so as not to
The normal transmission of primary user is disturbed, transmission of the cognition unlatching user on frequency spectrum is authorized, which must assure that, does not disturb primary user in mandate
Normal data transfer on frequency spectrum, user and non-cognitive radio users are closed in cognition can not use mandate frequency spectrum to carry out data
Transmission, can only use unauthorized frequency range to be communicated；
The computational methods of secondary user's are as follows in the step (2)：
(2a), calculate α SP- β E- γ C, wherein SPThe predicted value of spectral bandwidth for needed for cognitive radio users, E is controllable to switch
The predicted value of intelligent object energy expenditure, C is installs the cost of switch controllable intelligent module, and α, beta, gamma is SPAnd E, C are respective
Weight parameter；
(2b), compare α SP- β E- γ C and TaSize, wherein, TaTo judge whether secondary user's install switch controllable intelligent mould
The threshold value of block, if α SP-βE-γC≥Ta, then switch controllable intelligent module is installed, secondary user's are cognitive radio users；If α
SP- β E- γ C ＜ Ta, switch controllable intelligent module is not installed, secondary user's are non-cognitive radio users.
2. a kind of cognitive radio networks intermediate frequency spectrum allocation method based on demand according to claim 1, it is characterised in that described
The computational methods of switch controllable intelligent module are as follows in step (3)：
(3a), calculate λ S- μ ν Es-οEr, wherein S spectral bandwidth, E for needed for cognitive radio users are real-timesFor cognitive radio
User performs the predicted value for the energy expenditure that cognitive function can be produced, ErPerforming recombination function for cognitive radio users can produce
Energy expenditure predicted value, ν be cognitive radio users be chosen as perceive user probability, λ, μ, ο be S and Es, ErIt is respective
Weight parameter；
(3b), compare λ S- μ ν Es-οErWith TtSize, wherein, TtTo judge threshold value that whether cognitive radio module opens, if
λS-μνEs-οEr≥Tt, then switch controllable intelligent module is opened, cognitive radio users open user to be cognitive；If λ S- μ ν Es-
οEr＜ Tt, switch controllable intelligent module and be then closed, cognitive radio users close user to be cognitive.
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| CN102404751A (en) * | 2011-12-05 | 2012-04-04 | 昆明理工大学 | Cross-layer cognitive radio network user access method based on frequency hopping |
| WO2014121459A1 (en) * | 2013-02-06 | 2014-08-14 | Nokia Corporation | A method and apparatus for cooperative spectrum sensing |
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| CN102404751A (en) * | 2011-12-05 | 2012-04-04 | 昆明理工大学 | Cross-layer cognitive radio network user access method based on frequency hopping |
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