CN106412928A - Collaborative cognitive radio network cross-layer design method - Google Patents

Abstract

The invention relates to a collaborative cognitive radio network cross-layer design method. The collaborative cognitive radio network cross-layer design method is used in a collaborative cognitive radio network; the collaborative cognitive radio network is characterized by comprising at least one main user network, a fusion centre and at least one secondary user network; the main user network includes a main user base station and multiple main users; the main user base station and various main users are in communication connection; the secondary user network includes a secondary user base station and multiple secondary users; and the secondary user base station and various secondary users are in communication connection. When the main users perform communication by not occupying an authorized frequency band, frequency band information in an idle state can be notified to the secondary users needing to use the frequency band in time through the collaborative cognitive radio network cross-layer design method; and thus, on the premise of not interfering normal communication of the main users, instant and rapid communication of the secondary users can be ensured.

Description

Coordinating cognition wireless network cross-layer design method

Technical field

The present invention relates to the communications field, more particularly, to a kind of coordinating cognition wireless network cross-layer design method.

Background technology

Cognitive radio technology (Cognitive Radio, abbreviation CR) be one kind can " wait for an opportunity " ground-to-air ideler frequency compose into Row cognition detection, the idle frequency spectrum detecting is carried out shared utilization, and then solves a frequency spectrum resource difficult problem in short supply, thus really Realize improving the emerging communication technology of the availability of frequency spectrum.

The cognitive process of cognitive radio is：First, secondary user's (or claiming cognitive user) is constantly supervised using frequency spectrum perception Survey the resource of frequency range of mandate in surrounding；Then, ensureing that primary user can preferentially take mandate frequency range and primary user passes Under conditions of defeated performance is barely affected, secondary user is adaptively adjusted transceiver, and transceiver was adjusted to the free time Communicate in frequency range；Finally, when secondary user detects primary user's signal and occurs, secondary user quickly vacates currently used frequency range, So that the primary user belonging to this frequency range uses, it is to avoid be interfered when primary user is using this band communication.

Cognition wireless network is based on cognitive radio technology, and is at least formed by primary user and time user, to realize Secondary user utilizes the idle frequency range of primary user with waiting for an opportunity.However, in the cognition wireless network being formed by primary user and time user In, once primary user does not take it authorizes band communication, mandate frequency range now is in idle condition.How to need in secondary user Will using band communication when, the band information being in the free time licensing to primary user can be notified in time to secondary user, with Meet the communicating requirement of time user, and do not affect the proper communication of primary user and become the reality that cognition wireless network faces to ask Topic.

Content of the invention

The technical problem to be solved is to provide one kind to be not take up it in primary user for above-mentioned prior art to award During power band communication, the band information being in idle condition can be notified in time to the association of the secondary user needing using frequency range With cognition wireless network cross-layer design method.

The present invention solves the technical scheme that adopted of above-mentioned technical problem：

Coordinating cognition wireless network cross-layer design method, for recognizing it is characterised in that working in coordination with coordinating cognition wireless network Know that wireless network is made up of at least one primary user's network, a fusion center and at least one user network, primary user Primary user base station and multiple primary user, primary user base station and each primary user's communication connection is included, in secondary user network in network Include time user base station and multiple users, secondary user base station is connected with each telex network；This coordinating cognition wireless network Cross-layer design method comprises the steps 1 to step 8：

Step 1, sets up in each primary user's network primary user base station respectively and in each user network between time user base station Communication connection, to receive what time user sent through the secondary user base station in residing user network at any time by primary user base station Required using the access service that primary user's network Mid Frequency is communicated；

Secondary user base station in step 2, the primary user base station in each primary user's network and each user network is respectively Corresponding acquisition self-position, sets up primary user base station in fusion center and each primary user's network, in each user network Communication connection between secondary user base station, to obtain, by fusion center, the position that each primary user base station is sent with each user base station Confidence ceases；

Step 3, the positional information that fusion center sends according to each primary user base station and each user base station, count respectively Calculate the air line distance value between each primary user base station and each user base station, and according to gained each primary user base station and each use Distance value between the base station of family accesses situation to the cooperation between primary user's network and secondary user network and carries out Classification Management：

For a primary user base station, when there is lowest distance value between secondary user base station and this primary user base station, then select Fixed this user base station and this primary user base station as the pairing base station realizing cross-layer access, and be responsible for by this primary user base station right The access service of time user in time user network residing for this user base station；Otherwise, continue search for having with this primary user base station The secondary user base station of lowest distance value realizes, as with primary user base station, the pairing base station that cross-layer accesses, with by this primary user base station It is responsible for the access service of time user in time user network residing for the secondary user base station to this pairing specially；

Step 4, in each user network, secondary user base station presets M alliance's partition threshold, and each time user will obtain respectively Itself signal to noise ratio taking is sent to the secondary user base station in residing same user network, by secondary user base station, residing time is used Secondary user in the network of family carries out alliance's subregion the alliance's numbering to each subregion；M≥1；Secondary user base station is to residing user Alliance's subregion process of the secondary user in network comprises the steps 4-1 to step 4-4：

Step 4-1, the signal to noise ratio that secondary user base station sends according to each user in residing user network, calculate successively The normalization interference factor of other user's interference in network suffered by each user；Wherein, secondary user CR_iNormalization interference because Son is designated as

SNR_iRepresent time user CR_iItself signal to noise ratio, N represents time user CR_iAll users in residing user network Total number；I=1,2 ..., N, N >=3；

Step 4-2, secondary user base station calculates each user normalization in all user networks and trusts index；Its In：Secondary user CR_iNormalization trust index be designated as

Step 4-3, secondary user base station trusts index according to the normalization interference factor of each user of gained and normalization, Obtain the priority access index of each user's access primary user's network；Wherein, secondary user CR_iAccess preferentially connecing of primary user's network Enter index and be designated as ρ_i；For secondary user CR_iNormalization trust index,For Secondary user CR_iNormalization interference factor；

Step 4-4, secondary user base station presets M alliance's partition threshold, set M+1 alliance's sectional respectively [- ∞, λ₁)、[λ₁,λ₂)、…、[λ_M-1,λ_M) and [λ_M,∞)；Wherein, the secondary user corresponding priority access index in the first alliance It is in [- ∞, λ₁) in segment, the secondary user corresponding priority access index in the second alliance is in [λ₁,λ₂) segment Interior, the like, the secondary user corresponding priority access index in M alliance is in [λ_M-1,λ_M) in segment, be located at Secondary user corresponding priority access index in M+1 alliance is in [λ_M, ∞) and in segment, and each alliance is compiled successively Number；

Step 5, after each primary user's base station search obtains the secondary user network that it is responsible for specially, when in secondary user network When secondary user needs to be communicated using frequency range, secondary user sends its residing alliance and numbers to secondary user base station, and by this time User base station sends asks to the primary user base station of corresponding pairing using frequency range, to monitor residing primary user by primary user base station In network, each primary user is used the seizure condition situation authorizing frequency range, and the idle frequency spectrum monitoring information is sent to and is somebody's turn to do The secondary user base station of primary user base station pairing：

Primary user base station passes through the mandate frequency range on a physical layer primary user each in residing primary user's network being taken in real time Situation is monitored primary corresponding to idle frequency spectrum and the identification each mandate frequency range obtaining in residing primary user's network to integrate The modulation system of family signal, and the idle frequency spectrum that it is monitored by primary user base station real-time update, and by primary user base station After the idle frequency spectrum of recent renewal is uploaded to MAC layer management, by this primary user base station by the free time of this recent renewal monitoring Spectrum information and each primary user's signal modulation mode are transmitted to the secondary user base station with the pairing of this primary user base station；

Step 6, is needing using in the secondary user network residing for the secondary user of band communication, secondary in this user network User base station after receiving the idle frequency spectrum that primary user base station sent and primary user's signal modulation mode, this user's base Stand and utilize OFDMA technology to generate multiple discontinuous free time frequency ranges and according to the idle frequency range generating idle frequency spectrum Produce multiple frequency hopping patterns, and the alliance's numbering according to residing for secondary user using frequency hopping, will be received by secondary user base station All primary user's signal modulation modes and the frequency hopping pattern of generation be dynamically assigned to need to be communicated using frequency range Secondary user, then by secondary user according to the primary user's signal modulation mode receiving, adjustment its own signal modulation system is different from master Subscriber signal modulation system, and different band communication are not being taken in the same time according to frequency hopping pattern by secondary user, secondary to meet User is linked into the requirement in primary user's network, thus realize time user's interference-free being linked in primary user's network, to meet This time user is communicated using the idle frequency range in primary user's network；

Step 7, described user in step 6 completes after communication using frequency range, and this user sends and vacate frequency range Announcement information and residing alliance number to the secondary user base station in residing user network, with by secondary user base station by secondary user The feedback information having vacateed frequency range is sent to corresponding primary user base station；

Step 8, primary user base station after receiving the feedback information that time user base station is vacateed for frequency range, if primary user When base station judges that the primary user belonging to this frequency range does not propose the request taking this frequency range, then primary user base station using this frequency range as across The standby frequency range that layer accesses, the secondary user for subsequently needing band communication accesses and uses；If primary user base station judges this frequency Section belonging to primary user propose take this frequency range request when, then this frequency range of primary user's base station feedback can recover take information to Primary user, to realize the normal use to this frequency range for the primary user.

Compared with prior art, it is an advantage of the current invention that：

First, the coordinating cognition wireless network cross-layer design method that the present invention provides is by being divided into master by cognition wireless network User network and time user network, thus will provide the primary user of idle frequency range and need the secondary user of idle band communication to divide Open, definition needs cross-layer, to realize the secondary user of access service；

Secondly, it is equipped with the monitoring that primary user base station is responsible for idle frequency range in present networks specially in each primary user's network Work；It is equipped with time user base station to be responsible for specially and match primary user's base station communication, to realize Home Network in each user network The secondary user communicating is needed to successfully use the idle frequency range in primary user's network in network；

Again, secondary user base station is after receiving the idle frequency spectrum that sends of pairing primary user base station, by secondary user base station To be responsible for for idle frequency spectrum being divided into multiple no free time frequency ranges, to meet the secondary telex network in network residing for time user base station Need, secondary telex network needs in time user network can be well adapted for it is ensured that primary user base station is to primary user's network The monitoring efficiency of middle idle frequency spectrum；

Finally, secondary user is after vacateing frequency range, the secondary user base station being in consolidated network send vacate band information to Behind the primary user base station of pairing, primary user base station can need situation, to choose whether for this to vacate frequency range according to primary user The standby frequency range accessing as cross-layer, the secondary user for needing band communication accesses and uses, thus needing frequency by secondary user During Duan Tongxin, the very first time this standby frequency range can be supplied to time user through time user base station it is ensured that secondary user is timely, fast The carrying out of speed communicates.

Brief description

Fig. 1 is the schematic diagram of coordinating cognition wireless network in the embodiment of the present invention；

Fig. 2 is the schematic flow sheet of coordinating cognition wireless network cross-layer design method in the embodiment of the present invention；

Fig. 3 is the schematic diagram of frequency hopping pattern in the embodiment of the present invention.

Specific embodiment

Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.

Coordinating cognition wireless network cross-layer design method in the present embodiment, for, in coordinating cognition wireless network, working in coordination with Cognition wireless network is made up of at least one primary user's network, a fusion center and at least one user network, primary Primary user base station and multiple primary user, primary user base station and each primary user's communication connection, secondary user network is included in the network of family In include time user base station and multiple users, secondary user base station is connected with each telex network；Wherein, in the present embodiment Referring to shown in Fig. 1, being set in coordinating cognition wireless network, the number of primary user's network is labeled as coordinating cognition network structure X, primary user's network identity is PUN_x, primary user network PUN_xInterior primary user's number is labeled as I, primary user network PUN_xInterior Primary user is labeled as PU_x,i, primary user network PUN_xInterior primary user's basestation marker is PUBS_x；Fusion center is labeled as FC；Secondary use The number of family network is labeled as Y, and secondary user network is labeled as CRN_y, secondary user network CRN_yInterior secondary user's number is J, secondary use Family network C RN_yInterior secondary user's mark is CR_y,j, secondary user network CRN_yInterior secondary user base station is labeled as CRBS_y；X >=1,1 ≤ x≤X, Y >=1,1≤y≤Y, 1≤j≤J；Set primary user network PUN₁In primary user's number be I₁, primary user's network PUN₂In primary user's number be I₂..., primary user network PUN_XIn primary user's number be I_X；Secondary user network CRN₁In time User's number is J₁, secondary user network CRN₂In secondary user's number be J₂..., secondary user network CRN_YIn secondary user's number For J_Y；Shown in Figure 2, this coordinating cognition wireless network cross-layer design method comprises the steps：

Step 1, sets up in each primary user's network primary user base station respectively and in each user network between time user base station Communication connection, to receive what time user sent through the secondary user base station in residing user network at any time by primary user base station Required using the access service that primary user's network Mid Frequency is communicated；

For example, in the coordinating cognition wireless network shown in Fig. 1, primary user network PUN₁Primary user base station PUBS₁Respectively With secondary user base station CRBS₁, secondary user base station CRBS₂..., secondary user base station CRBS_y-1And secondary user base station CRBS_ySet up logical Letter connects；Primary user base station PUBS₂Respectively with secondary user base station CRBS₁, secondary user base station CRBS₂..., secondary user base station CRBS_Y-1And secondary user base station CRBS_YSet up communication connection；By that analogy, primary user base station PUBS₃To primary user base station PUBS₁Respectively accordingly with secondary user base station CRBS₁, secondary user base station CRBS₂..., secondary user base station CRBS_y-1And secondary use Family base station CRBS_ySet up communication connection；

Wherein, primary user base station PUBS₁To primary user base station CRBS_yIt is ready to receive time user to send out through time user base station The access service sent requires；

Secondary user base station in step 2, the primary user base station in each primary user's network and each user network is respectively Corresponding acquisition self-position, sets up primary user base station in fusion center and each primary user's network, in each user network Communication connection between secondary user base station, to obtain, by fusion center, the position that each primary user base station is sent with each user base station Confidence ceases；

Primary user network PUN_xIn, primary user base station PUBS_xObtain self-position be1≤ x≤X；Secondary user network CRN_yIn, secondary user base station CRBS_yObtain self-position be1≤y≤ Y；

Step 3, the positional information that fusion center sends according to each primary user base station and each user base station, count respectively Calculate the air line distance value between each primary user base station and each user base station, and according to gained each primary user base station and each use Distance value between the base station of family accesses situation to the cooperation between primary user's network and secondary user network and carries out Classification Management：

For a primary user base station, when there is lowest distance value between secondary user base station and this primary user base station, then select Fixed this user base station and this primary user base station as the pairing base station realizing cross-layer access, and be responsible for by this primary user base station right The access service of time user in time user network residing for this user base station；Otherwise, continue search for having with this primary user base station The secondary user base station of lowest distance value realizes, as with primary user base station, the pairing base station that cross-layer accesses, with by this primary user base station It is responsible for the access service of time user in time user network residing for the secondary user base station to this pairing specially；

Fusion center FC is according to each primary user base station PUBS_xSelf-positionAnd each use Family base station CRBS_ySelf-positionObtain primary user base station PUBS_xWith secondary user base station CRBS_yIt Between air line distance value be d (PUBS_x,CRBS_y)：

Wherein, 1≤x≤X, 1≤y≤Y；

For example, in primary user network PUN₁In, for primary user base station PUBS₁, each user base station and this primary user base station PUBS_xAir line distance value be respectively d (PUBS₁,CRBS₁)、d(PUBS₁,CRBS₂)、…、d(PUBS₁,CRBS_Y)；If d (PUBS₁,CRBS₂) be minima in this Y air line distance value, then by secondary user base station CRBS₂With primary user base station PUBS₁ As the pairing base station realizing cross-layer access, primary user base station PUBS₁It is responsible for secondary user base station CRBS to this pairing specially₂Institute Place time user network CRN₂In time user access service；Certainly, if d is (PUBS₁,CRBS_Y) in this Y air line distance value Minima, then by secondary user base station CRBS_YWith primary user base station PUBS₁As the pairing base station realizing cross-layer access, primary user Base station PUBS₁It is responsible for secondary user base station CRBS to this pairing specially_YResiding user network CRN_YIn time user access clothes Business；

In the same manner, in other primary user's networks, get the secondary user base station with the pairing of corresponding primary user base station successively, Here is omitted pairing base station acquisition process；

Step 4, in each user network, secondary user base station presets M alliance's partition threshold, and each time user will obtain respectively Itself signal to noise ratio taking is sent to the secondary user base station in residing same user network, by secondary user base station, residing time is used Secondary user in the network of family carries out alliance's subregion the alliance's numbering to each subregion；M≥1；Secondary user base station is to residing user Alliance's subregion process of the secondary user in network comprises the steps 4-1 to step 4-4：

Step 4-1, the signal to noise ratio that secondary user base station sends according to each user in residing user network, calculate successively The normalization interference factor of other user's interference in network suffered by each user；Wherein, secondary user CR_iNormalization interference because Son is designated as

SNR_iRepresent time user CR_iItself signal to noise ratio, N represents time user CR_iAll users in residing user network Total number；I=1,2 ..., N, N >=3；In addition, according to the state of signal-to-noise of each user, being calculated residing user network The normalization Annoyance Index to secondary user for the secondary user around is obtained in network, secondary around truly to be reflected by normalization Annoyance Index The integrated interference situation to it for the user；

Step 4-2, secondary user base station calculates each user normalization in all user networks and trusts index；Its In：Secondary user CR_iNormalization trust index be designated as

Step 4-3, secondary user base station trusts index according to the normalization interference factor of each user of gained and normalization, Obtain the priority access index of each user's access primary user's network；Wherein, secondary user CR_iAccess preferentially connecing of primary user's network Enter index and be designated as ρ_i；For secondary user CR_iNormalization trust index,For Secondary user CR_iNormalization interference factor；The priority access exponential representation of secondary user when there being frequency range to be available for utilizing, secondary user Enjoy the sequencing situation of this available frequency band；Wherein, secondary user base station is given priority in arranging for, and high secondary user is sharp for priority access index It is linked in network with available frequency band；

Step 4-4, secondary user base station presets M alliance's partition threshold, set M+1 alliance's sectional respectively [- ∞, λ₁)、[λ₁,λ₂)、…、[λ_M-1,λ_M) and [λ_M,∞)；Wherein, the secondary user corresponding priority access index in the first alliance It is in [- ∞, λ₁) in segment, the secondary user corresponding priority access index in the second alliance is in [λ₁,λ₂) segment Interior, the like, the secondary user corresponding priority access index in M alliance is in [λ_M-1,λ_M) in segment, be located at Secondary user corresponding priority access index in M+1 alliance is in [λ_M, ∞) and in segment, and each alliance is compiled successively Number；

For example, for secondary user network CRN_y, this user network CRN_yInterior secondary number of users is J, secondary user base station CRBS_yDefault 5 alliance's partition threshold are λ₁、λ₂、λ₃、λ₄、λ₅；λ₁=0.1, λ₂=0.2, λ₃=0.4, λ₄=0.5 and λ₅= 0.7；

First alliance C₁The priority access index of interior secondary user be in (- ∞, 0.1] segment in, the second alliance C₂Interior Secondary user priority access index be in (0.1,0.2] segment in, the 3rd alliance C₃The priority access of interior secondary user Index be in (0.2,0.4] segment in, fourth federation C₄The priority access index of interior secondary user be in (0.4,0.5] In segment, the 5th alliance C₅The priority access index of interior secondary user be in (0.5,0.7] segment in, the 6th alliance C₆ The priority access index of interior secondary user is in the segment of (0.7, ∞)；

Thus, in secondary user network CRN_yInterior secondary user CR_y,1Priority access index be in (0.2,0.4] segment When interior, then labelling time user CR₁Alliance to number be C₃；Likewise it is possible to obtain the alliance's numbering residing for other user；

Step 5, after each primary user's base station search obtains the secondary user network that it is responsible for specially, when in secondary user network When secondary user needs to be communicated using frequency range, secondary user sends its residing alliance and numbers to secondary user base station, and by this time User base station sends asks to the primary user base station of corresponding pairing using frequency range, to monitor residing primary user by primary user base station In network, each primary user is used the seizure condition situation authorizing frequency range, and the idle frequency spectrum monitoring information is sent to and is somebody's turn to do The secondary user base station of primary user base station pairing：

Primary user base station passes through the mandate frequency range on a physical layer primary user each in residing primary user's network being taken in real time Situation is monitored primary corresponding to idle frequency spectrum and the identification each mandate frequency range obtaining in residing primary user's network to integrate The modulation system of family signal, and the idle frequency spectrum that it is monitored by primary user base station real-time update, and by primary user base station After the idle frequency spectrum of recent renewal is uploaded to MAC layer management, by this primary user base station by the free time of this recent renewal monitoring Spectrum information and each primary user's signal modulation mode are transmitted to the secondary user base station with the pairing of this primary user base station；

For example, in primary user base station PUBS₁Search obtains the secondary user network CRN that it is responsible for specially_YAfterwards, as this user Network C RN_YIn secondary user CR_Y,jWhen needing to be communicated using frequency range, secondary user CR_Y,jSend its residing alliance number to Secondary user base station CRBS_Y, and by this user base station CRBS_YSend and asked to the primary user base station of corresponding pairing using frequency range PUBS₁, by primary user base station PUBS₁To monitor residing primary user network PUN₁Interior each primary user is used the occupancy authorizing frequency range State status：

Primary user base station PUBS₁Pass through on a physical layer to residing primary user network PUN in real time₁In each primary user take Frequency range situation is authorized to be monitored obtaining residing primary user network PUN to integrate₁In idle frequency spectrum and identification each authorize frequency The modulation system of primary user's signal corresponding to section, and by primary user base station PUBS₁Its idle frequency spectrum of being monitored of real-time update, And by primary user base station PUBS₁After the idle frequency spectrum of recent renewal is uploaded to MAC layer management, by this primary user base station PUBS₁Will The idle frequency spectrum information of this recent renewal monitoring and each primary user's signal modulation mode are transmitted to and this primary user base station PUBS₁Secondary user base station CRBS of pairing_Y；Where it is assumed that primary user base station PUBS₁It is transmitted to time user base station CRBS_YFrequency range For primary user PU_1,2License；Primary user base station PUBS herein₁Integrate the idle frequency spectrum that obtains at least include one available Idle frequency range；

Step 6, is needing using in the secondary user network residing for the secondary user of band communication, secondary in this user network User base station after receiving the idle frequency spectrum that primary user base station sent and primary user's signal modulation mode, this user's base Stand and utilize OFDMA technology to generate multiple discontinuous free time frequency ranges and according to the idle frequency range generating idle frequency spectrum Produce multiple frequency hopping patterns, and the alliance's numbering according to residing for secondary user using frequency hopping, will be received by secondary user base station All primary user's signal modulation modes and the frequency hopping pattern of generation be dynamically assigned to need to be communicated using frequency range Secondary user, then by secondary user according to the primary user's signal modulation mode receiving, adjustment its own signal modulation system is different from master Subscriber signal modulation system so that secondary user will not and primary user's network in signal between produce interference, and by secondary use Family is not taking different band communication in the same time according to frequency hopping pattern, is linked into wanting in primary user's network to meet time user Asking, thus realize time user's interference-free being linked in primary user's network, being utilized in primary user's network with meeting this user Idle frequency range is communicated；

With in step 5 accordingly it is assumed that secondary user CR_Y,jIt is C that residing alliance numbers₅, needing using band communication Secondary user CR_Y,jResiding secondary user network CRN_YIn, this user network CRN_YIn secondary user base station CRBS_YReceiving master User base station PUBS₁After the idle frequency spectrum being sent, this user base station CRBS_YFrequency hopping is utilized to produce according to idle frequency spectrum Raw frequency hopping pattern, and according to secondary user CR_Y,jResiding alliance's numbering C₅, the frequency hopping pattern of generation is dynamically assigned to need The secondary user CR that frequency range to be used is communicated_Y,j, then by this user CR_Y,jAccording to the frequency hopping pattern receiving not in the same time Take different band communication, to meet time user CR_Y,jIt is linked into primary user network PUN₁In requirement, thus realize time use Family CR_Y,jIt is linked into primary user network PUN₁In, to meet this user CR_Y,jUsing primary user network PUN₁In idle frequency range Communicated；Wherein, in primary user base station, the idle frequency spectrum information in network residing for it is sent to the secondary user base station of pairing Afterwards, it is responsible for for idle frequency spectrum generating multiple discontinuous free time frequency ranges by secondary user base station, can use and fully meet time user network Middle have multiple user's being actually needed using band communication；Will be many for the generation of idle frequency range if be responsible for by primary user base station Individual discontinuous free time frequency range, so can weaken primary user base station to a certain extent and residing primary user's network Mid Frequency is taken The monitoring efficiency of situation, and because the very first time can not be known the secondary number of users needing using band communication in primary user base station, Thus the idle frequency range number also resulting in the generation of primary user base station is not matched that with the secondary number of users being actually needed；

In the present embodiment, to be responsible for specially generating idle frequency spectrum according to time being actually needed of user using secondary user base station The idle frequency range of desirable number, can be well adapted for secondary telex network needs in time user network it is ensured that primary user's base The monitoring efficiency stood to idle frequency spectrum in primary user's network；Secondary user base station CRBS_YFrequency hopping is utilized to produce according to idle frequency range Raw frequency hopping pattern is referring to shown in Fig. 3；In frequency hopping pattern shown in Fig. 3, the primary user base station that secondary user base station will be matched The idle frequency spectrum sending divide into h discontinuous frequency range, and the secondary user for needing communication uses；

Step 7, described user in step 6 completes after communication using frequency range, and this user sends and vacate frequency range Announcement information and residing alliance number to the secondary user base station in residing user network, with by secondary user base station by secondary user The feedback information having vacateed frequency range is sent to corresponding primary user base station；

As secondary user CR_Y,jComplete after communication using frequency range, secondary user CR_Y,jSend announcement information and the institute vacateing frequency range Alliance of place numbering C₅To residing user network CRN_YIn secondary user base station CRBS_Y, with by secondary user base station CRBS_YBy secondary use The feedback information that frequency range has been vacateed at family is sent to corresponding primary user base station PUBS₁；

Step 8, primary user base station after receiving the feedback information that time user base station is vacateed for frequency range, if primary user When base station judges that the primary user belonging to this frequency range does not propose the request taking this frequency range, then primary user base station using this frequency range as across The standby frequency range that layer accesses, the secondary user for needing band communication accesses and uses；If primary user base station judges this frequency range institute When the primary user belonging to proposes the request taking this frequency range, then this frequency range of primary user's base station feedback can recover the information taking to primary Family, to realize the normal use to this frequency range for the primary user.

Accordingly, primary user base station PUBS₁Receiving time user base station CRBS_YAfter the feedback information vacateed for frequency range, If primary user base station PUBS₁Judge the primary user PU belonging to this frequency range_1,2When not proposing the request taking this frequency range, then primary Family base station PUBS₁The standby frequency range that this frequency range is accessed as cross-layer, the secondary user for needing band communication accesses and uses；As Fruit primary user base station PUBS₁Judge the primary user PU belonging to this frequency range_1,2When proposing the request taking this frequency range, then primary user's base Stand PUBS₁Feed back this frequency range and can recover the information taking to primary user PU_1,2, to realize primary user PU_1,2Normal to this frequency range Use.

Claims (1)

1. coordinating cognition wireless network cross-layer design method, in coordinating cognition wireless network it is characterised in that coordinating cognition Wireless network is made up of at least one primary user's network, a fusion center and at least one user network, primary user's net Include primary user base station and multiple primary user, primary user base station and each primary user's communication connection in network, wrap in secondary user network Time user base station and multiple users are included, secondary user base station is connected with each telex network；This coordinating cognition wireless network across Layer method for designing comprises the steps 1 to step 8：

Step 1, sets up primary user base station in each primary user's network respectively and logical between time user base station in each user network Letter connects, to receive, by primary user base station, the utilization that time user sends through the secondary user base station in residing user network at any time The access service that primary user's network Mid Frequency is communicated requires；

Secondary user base station in step 2, the primary user base station in each primary user's network and each user network respectively corresponds to Acquisition self-position, set up primary user base station in fusion center and each primary user's network, the secondary use in each user network Communication connection between the base station of family, to obtain, by fusion center, the position letter that each primary user base station is sent with each user base station Breath；

Step 3, the positional information that fusion center sends according to each primary user base station and each user base station, calculate respectively Air line distance value between each primary user base station and each user base station, and according to gained each primary user base station and each user's base Distance value between standing accesses situation to the cooperation between primary user's network and secondary user network and carries out Classification Management：

For a primary user base station, when having lowest distance value between secondary user base station and this primary user base station, then selecting should Secondary user base station and this primary user base station are as the pairing base station realizing cross-layer access, and are responsible for this time by this primary user base station The access service of time user in time user network residing for user base station；Otherwise, continue search for, with this primary user base station, there is minimum The secondary user base station of distance value realizes, as with primary user base station, the pairing base station that cross-layer accesses, with special by this primary user base station It is responsible for the access service of time user in time user network residing for the secondary user base station to this pairing；

Step 4, in each user network, secondary user base station presets M alliance's partition threshold, and each user is respectively by acquisition Itself signal to noise ratio is sent to the secondary user base station in residing same user network, by secondary user base station to residing user network Secondary user in network carries out alliance's subregion the alliance's numbering to each subregion；M≥1；Secondary user base station is to residing user network Alliance's subregion process of interior secondary user comprises the steps 4-1 to step 4-4：

Step 4-1, the signal to noise ratio that secondary user base station sends according to each user in residing user network, calculate each time successively The normalization interference factor of other user's interference in network suffered by user；Wherein, secondary user CR_iNormalization interference factor note For

${\mathrm{\ζ}}_i=\frac{\underset{l=1,l\≠i}{\overset{N}{\mathrm{\Σ}}}\frac{{{\mathrm{SNR}}^2}_l-{{\mathrm{SNR}}^2}_i}{{{\mathrm{SNR}}^2}_i}}{\sqrt{\frac{1}{N}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{(1/{{\mathrm{SNR}}^2}_i)}^2}};\stackrel{\‾}{{\mathrm{\ζ}}_i}=\frac{{\mathrm{\ζ}}_i}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\ζ}}_i};$

SNR_iRepresent time user CR_iItself signal to noise ratio, N represents time user CR_iIn residing user network, all users' is total Number；I=1,2 ..., N, N >=3；

Step 4-2, secondary user base station calculates each user normalization in all user networks and trusts index；Wherein：Secondary User CR_iNormalization trust index be designated as

${\mathrm{\ψ}}_i=\frac{\frac{1}{N}\underset{l=1,l\≠i}{\overset{N}{\mathrm{\Σ}}}{({\mathrm{SNR}}_i-{\mathrm{SNR}}_l)}^2}{\sqrt{\frac{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\left({\mathrm{SNR}}_i\right)}^2}{N}}};\stackrel{\‾}{{\mathrm{\ψ}}_i}=\frac{{\mathrm{\ψ}}_i}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\mathrm{\ψ}}_i};$

Step 4-3, secondary user base station trusts index according to the normalization interference factor of each user of gained and normalization, obtains Each user accesses the priority access index of primary user's network；Wherein, secondary user CR_iThe priority access accessing primary user's network refers to Number scale is ρ_i；I=1,2 ..., N, N >=3；For secondary user CR_iNormalization trust index,For secondary user CR_i Normalization interference factor；

Step 4-4, secondary user base station presets M alliance's partition threshold, sets M+1 alliance's sectional and is respectively [- ∞, λ₁)、 [λ₁,λ₂)、…、[λ_M-1,λ_M) and [λ_M,∞)；Wherein, the secondary user corresponding priority access index in the first alliance is in [-∞,λ₁) in segment, the secondary user corresponding priority access index in the second alliance is in [λ₁,λ₂) in segment, The like, the secondary user corresponding priority access index in M alliance is in [λ_M-1,λ_M) in segment, positioned at M+ Secondary user corresponding priority access index in 1 alliance is in [λ_M, ∞) and in segment, and each alliance is numbered successively；

Step 5, after each primary user's base station search obtains the secondary user network that it is responsible for specially, when the secondary use in secondary user network When family needs to be communicated using frequency range, secondary user sends its residing alliance and numbers to secondary user base station, and by this user Base station sends asks to the primary user base station of corresponding pairing using frequency range, to monitor residing primary user's network by primary user base station Interior each primary user is used the seizure condition situation authorizing frequency range, and the idle frequency spectrum monitoring information is sent to primary with this The secondary user base station of family base station pairing：

Primary user base station passes through the mandate frequency range situation on a physical layer primary user each in residing primary user's network being taken in real time It is monitored obtaining the idle frequency spectrum in residing primary user's network and primary user's letter corresponding to identification each mandate frequency range to integrate Number modulation system, and the idle frequency spectrum that it is monitored by primary user base station real-time update, and will be nearest for primary user base station After the idle frequency spectrum updating is uploaded to MAC layer management, by this primary user base station by the idle frequency spectrum of this recent renewal monitoring Information and each primary user's signal modulation mode are transmitted to the secondary user base station with the pairing of this primary user base station；

Step 6, is needing using the secondary user in the secondary user network residing for the secondary user of band communication, in this user network After receiving the idle frequency spectrum that primary user base station sent and primary user's signal modulation mode, this time user base station will for base station Idle frequency spectrum utilizes OFDMA technology to generate multiple discontinuous free time frequency ranges and utilized according to the idle frequency range generating Frequency hopping produces multiple frequency hopping patterns, and the alliance's numbering according to residing for secondary user, with the institute that will be received by secondary user base station The frequency hopping pattern having primary user's signal modulation mode and generation is dynamically assigned to need the secondary use being communicated using frequency range Family, then by secondary user according to the primary user's signal modulation mode receiving, adjustment its own signal modulation system is different from primary user Signal modulation mode, and different band communication are not being taken in the same time according to frequency hopping pattern by secondary user, to meet time user It is linked into the requirement in primary user's network, thus realize time user's interference-free being linked in primary user's network, to meet this time User is communicated using the idle frequency range in primary user's network；

Step 7, described user in step 6 completes after communication using frequency range, and this time user sends the notice vacateing frequency range Information and residing alliance number to the secondary user base station in residing user network, to be risen secondary user by secondary user base station The feedback information going out frequency range is sent to corresponding primary user base station；

Step 8, primary user base station after receiving the feedback information that time user base station is vacateed for frequency range, if primary user base station When judging that the primary user belonging to this frequency range does not propose the request taking this frequency range, then this frequency range is connect by primary user base station as cross-layer The standby frequency range entering, the secondary user for subsequently needing band communication accesses and uses；If primary user base station judges this frequency range institute When the primary user belonging to proposes the request taking this frequency range, then this frequency range of primary user's base station feedback can recover the information taking to primary Family, to realize the normal use to this frequency range for the primary user.