CN103139785A - Space-time spectrum sharing method and system based on regional division - Google Patents
Space-time spectrum sharing method and system based on regional division Download PDFInfo
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Abstract
The invention discloses a space-time spectrum sharing method and a system based on regional division. Master user communication parameters and secondary user communication parameters respectively sent by master users and secondary users are received; Boundary calculation of a spectrum sharing area is conducted by the combination of the master user communication parameters and the secondary user communication parameters, and the spectrum sharing area is divided into five areas; Each secondary user belongs to which area is judged according to the secondary user parameters, and a corresponding sharing way is adopted to conduct the space-time spectrum sharing according to the judged results. According to the space-time spectrum sharing method and the system based on the regional division, spectrum opportunities on a time domain are fully used in a cognitive wireless network., the space-domain spectrum sharing and the time-domain spectrum sharing are organically combined, and thereby the spectrum utilization efficiency is further improved, boundaries of each area in the spectrum sharing area are calculated, and the actual operation value is strong.
Description
Technical field
The present invention relates to wireless communication system intermediate frequency spectrum technology of sharing field, relate in particular to a kind of empty time-frequency spectrum of dividing based on the zone and share method and system.
Background technology
" frequency spectrum is rare " become a bottleneck of restriction Next-Generation Wireless Communication Systems development.Traditional method be take fixed form with the radio communication spectrum allocation may to different business, frequency range is generally only independent for a wireless communication system, by unification of the motherland distribute, mandate.But, along with the complexity day by day of wireless network architecture and the severization of communication technology quality requirement, make the sharp increase of frequency spectrum resource demand and the limited contradiction of resource self-capacity day by day intensify.Along with software and radio technique (Software Defined Radio, SDR) development and cognitive radio (Cognitive Radio, CR) proposition of concept, the insider generally believes that cognitive radio technology is to improve a kind of effective ways that frequency spectrum uses effectiveness efficient.Based on the understanding wireless network (Cognitive Radio Networks, CRN) of cognitive radio technology, it is one of research field of forefront, the current communications field.Cognition wireless network is a kind of network with cognitive function, and it can differentiate current network state, then according to these states plan, decision-making and response.
Dynamic spectrum technology of sharing (Dynamic Spectrum sharing, DSS) be that cognition wireless network can improve the very crucial technology that the availability of frequency spectrum relies on, its basic thought is that cognitive user is under the prerequisite of the service quality (QoS) that guarantees the primary user, the cognition network user dynamically utilizes primary user's frequency range (being primary user's mandate frequency range) to communicate, thereby improves spectrum utilization efficiency.It is two classes that the dynamic spectrum technology of sharing that proposes at present is divided into, and namely the spatial domain dynamic spectrum is shared and time-domain spectral is shared, but each defectiveness both.
The spatial domain frequency spectrum share is known as again spectrum underlay, allows cognitive user under the prerequisite of interfere with primary users not, adopts simultaneously with the primary user and authorizes frequency range to communicate, and is not subjected to time restriction.But because cognitive user need to be carried out power effectively and controlled the interference of avoiding the primary user, thereby cause reducing time user's transmission rate.In addition, if inferior user distance primary user is excessively near, can not carry out transfer of data owing to disturbing excessive.Therefore in fact the spatial domain frequency spectrum share has ignored certain spatial domain spectrum utilization chance.
Whether time-domain spectral is shared, and is known as again spectrum overlay, allow cognitive user idle by frequency spectrum detection technology for detection mandate frequency range, thereby can not carry out transfer of data during the use authority frequency range the primary user, is not subjected to the distance limit with the primary user.But time-domain spectral is shared the behavioural characteristic that greatly relies on the primary user, if the primary user takies certain section frequency spectrum certain period always, cognitive user can not be utilized this section frequency spectrum.Therefore time-domain spectral is shared and has in fact been ignored certain time-domain spectral and improve the occasion.
In sum, present dynamic spectrum technology of sharing is all studied separately for spatial domain or time domain mostly, but there is defective in the aspect that utilizes of each comfortable spectrum utilization chance.Although existing relevant research and technology have proposed the concept of the spectrum utilization chance that spatial domain and time domain combine, and with it as the index of weighing frequency spectrum detection, further do not study how effectively not utilize above-mentioned two spectrum opportunities.Although approved gradually based on the frequency spectrum share technology that the zone is divided, it is mainly used in the spatial domain frequency spectrum share, lack the effective utilization to the time-domain spectral chance.
Summary of the invention
The technical problem that (one) will solve
For defects, the technical problem to be solved in the present invention is how to realize spatial domain and the time domain combined frequency spectrum share of carrying out under cognition wireless network, improves spectrum utilization efficiency.
(2) technical scheme
For addressing the above problem, the invention provides a kind of empty time-frequency spectrum sharing method of dividing based on the zone, described method specifically comprises:
A: receive primary user's messaging parameter and cognitive user messaging parameter that primary user and cognitive user send respectively;
B: carry out the feature modeling in frequency spectrum share zone in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter, described frequency spectrum share zone is divided into five zones;
C: judge according to described cognitive user messaging parameter each cognitive user belongs to which zone in described frequency spectrum share zone, and adopt corresponding sharing mode to carry out sharing of sky time-frequency spectrum according to result of determination.
Preferably, described primary user's messaging parameter comprises: the interference threshold that primary user position, primary user's Transmission probability threshold and primary user can bear; Described cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
Preferably, describedly described frequency spectrum share zone is divided into five zones specifically comprises: primary user protection zone, time-domain spectral shared region, mix frequency spectrum share zone, spatial domain and the frequency spectrum share zone, the unrestricted spatial domain of power of frequency spectrum share zone, power limited system when empty.
Preferably, the described feature modeling that carries out the frequency spectrum share zone in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter specifically comprises:
B1: calculate primary user protection zone outer radius, calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, described communication interruption probability is when reaching described primary user's Transmission probability threshold, and the distance between the receiver at described primary user's transmitter and its covering edge is described primary user protection zone outer radius;
B2: calculate time-domain spectral shared region outer radius, when described cognitive user and described primary user carry out the spatial domain frequency spectrum share, distance according to cognitive user transmitter and cognitive user receiver, the distance of described primary user's transmitter and described cognitive user receiver is calculated the signal to noise ratio of accepting of the cognitive user receiver be in described cognitive user transmitter smallest coverage edge, draw the expression formula of the track of described cognitive user receiver, described track for the circle, wherein the center of circle is the position of described cognitive user transmitter, the distance between described cognitive user transmitter and primary user's transmitter is described time-domain spectral shared region outer radius,
B3: mix the regional outer radius of frequency spectrum share when calculating sky, the upper bound and lower bound that the described cognitive user false dismissal probability that according to frequency spectrum detection is and described false alarm probability thresholding are determined detection threshold, the cognitive user when the described upper bound equates with described lower bound and the distance between primary user's transmitter are the described regional outer radius of frequency spectrum share of mixing when empty;
B4: frequency spectrum share zone, the unrestricted spatial domain of rated output inside radius, suppose that frequency spectrum share zone, the unrestricted spatial domain of described power inside radius is unknown parameter, calculating described unknown parameter to the accumulative total of all cognitive user of infinite point disturbs, and calculate when described accumulative total and disturb when equaling interference threshold that described primary user can bear, the value of described unknown parameter is the regional inside radius of described power unrestricted spatial domain frequency spectrum share;
B5: the size of mixing frequency spectrum share zone outer radius and frequency spectrum share zone, the unrestricted spatial domain of described power inside radius during according to described sky judges whether the frequency spectrum share zone, spatial domain of described power limited system exists, if mix the regional outer radius of frequency spectrum share during described sky less than frequency spectrum share zone, the unrestricted spatial domain of described power inside radius, the frequency spectrum share zone, spatial domain of described power limited system exists, otherwise does not exist.
Preferably, described step C specifically comprises:
C1: judge whether described cognitive user belongs to described primary user protection zone, if it is described cognitive user is not carried out the frequency spectrum share zone, otherwise enters step C2;
C2: judge whether described cognitive user belongs to the time-domain spectral shared region, it is shared that if it is described cognitive user is carried out time-domain spectral, otherwise enter step C3;
C3: judge when whether described cognitive user belongs to sky and to mix the frequency spectrum share zone, if it is described cognitive user is carried out time-domain spectral and is shared or the spatial domain frequency spectrum share, otherwise enters step C4;
C4: judge whether described cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, and if it is described cognitive user is carried out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters step C5;
C5: carry out the spatial domain frequency spectrum share with any power.
For addressing the above problem, the present invention also provides a kind of empty time-frequency spectrum shared system of dividing based on the zone, and described system comprises:
Primary user unit, frequency spectrum share unit and cognitive user unit;
Described primary user unit comprises primary user's messaging parameter reporting module, is used for sending primary user's messaging parameter;
Described frequency spectrum share unit is used for carrying out in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter the feature modeling in frequency spectrum share zone, described frequency spectrum share zone is divided into five zones, specifically comprises: regional computing module, region allocation module and region allocation information sending module;
Described cognitive user unit is used for judging according to described cognitive user messaging parameter each cognitive user belongs to which zone in described frequency spectrum share zone, and adopt corresponding sharing mode to carry out sharing of sky time-frequency spectrum according to result of determination, specifically comprise: cognitive user messaging parameter reporting module, frequency spectrum share mode decision module, time-domain spectral sharing module and spatial domain frequency spectrum share module.
Preferably, the cognitive user messaging parameter of primary user's messaging parameter of the described primary user's messaging parameter reporting module transmission of described regional computing module reception and the transmission of described cognitive user messaging parameter reporting module carries out the feature modeling in described frequency spectrum share zone;
Wherein said primary user's messaging parameter comprises the interference threshold that primary user position, primary user's Transmission probability threshold and primary user can bear; Described cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
Preferably, described regional computing module with described frequency spectrum share zone be divided into primary user protection zone, time-domain spectral shared region, mix the frequency spectrum share zone when empty, frequency spectrum share zone, spatial domain and five zones, frequency spectrum share zone, the unrestricted spatial domain of power of power limited system.
Preferably, it is characterized in that, described regional computing module specifically comprises:
The first computing module, the second computing module, the 3rd computing module, the 4th computing module and the 5th regional determination module;
Described the first computing module, be used for to calculate primary user protection zone outer radius, calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, described communication interruption probability is when reaching described primary user's Transmission probability threshold, and the distance between the receiver at described primary user's transmitter and its covering edge is described primary user protection zone outer radius;
described the second computing module, be used for calculating time-domain spectral shared region outer radius, when described cognitive user and described primary user carry out the spatial domain frequency spectrum share, distance according to cognitive user transmitter and cognitive user receiver, the distance of described primary user's transmitter and described cognitive user receiver is calculated the signal to noise ratio of accepting of the cognitive user receiver be in described cognitive user transmitter smallest coverage edge, draw the expression formula of the track of described cognitive user receiver, described track for the circle, wherein the center of circle is the position of described cognitive user transmitter, the distance between described cognitive user transmitter and primary user's transmitter is described time-domain spectral shared region outer radius,
Described the 3rd computing module, mix the regional outer radius of frequency spectrum share when being used for calculating sky, the upper bound and lower bound that the described cognitive user false dismissal probability that according to frequency spectrum detection is and described false alarm probability thresholding are determined detection threshold, the cognitive user when the described upper bound equates with described lower bound and the distance between primary user's transmitter are the described regional outer radius of frequency spectrum share of mixing when empty;
Described the 4th computing module, be used for frequency spectrum share zone, the unrestricted spatial domain of rated output inside radius, suppose that frequency spectrum share zone, the unrestricted spatial domain of described power inside radius is unknown parameter, calculating described unknown parameter to the accumulative total of all cognitive user of infinite point disturbs, and calculate when described accumulative total and disturb when equaling interference threshold that described primary user can bear, the value of described unknown parameter is the regional inside radius of described power unrestricted spatial domain frequency spectrum share;
The size of mixing frequency spectrum share zone outer radius and frequency spectrum share zone, the unrestricted spatial domain of described power inside radius when described the 5th regional determination module is used for according to described sky judges whether the frequency spectrum share zone, spatial domain of described power limited system exists, if mix the regional outer radius of frequency spectrum share during described sky less than frequency spectrum share zone, the unrestricted spatial domain of described power inside radius, the frequency spectrum share zone, spatial domain of described power limited system exists, otherwise does not exist.
Preferably, described region allocation module comprises: the first judge module, the second judge module, the 3rd judge module, the 4th judge module and the 5th module;
Described the first judge module is used for judging whether described cognitive user belongs to described primary user protection zone, and if it is described cognitive user is not carried out the frequency spectrum share zone, otherwise enters described the second judge module;
Described the second judge module is used for judging whether described cognitive user belongs to the time-domain spectral shared region, and if it is described cognitive user enters described time-domain spectral sharing module and carries out time-domain spectral and share, otherwise enters described the 3rd judge module;
Described the 3rd judge module, be used for judging mixing frequency spectrum share zone when whether described cognitive user belongs to sky, if it is described cognitive user enters described time-domain spectral sharing module and carries out time-domain spectral and share or enter described spatial domain frequency spectrum share module and carry out the spatial domain frequency spectrum share, otherwise enters described the 4th judge module;
Described the 4th judge module, be used for judging whether described cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, if it is described cognitive user enters described spatial domain frequency spectrum share module and carries out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters described the 5th module;
Described the 5th module enters described spatial domain frequency spectrum share module for described cognitive user and carries out the spatial domain frequency spectrum share with any power.
(3) beneficial effect
The present invention proposes a kind of empty time-frequency spectrum of dividing based on the zone and share method and system, take full advantage of the spectrum opportunities on time domain in cognition wireless network, spatial domain frequency spectrum share and time-domain spectral are shared combination, thereby further promote spectrum utilization efficiency, computational methods are carried out on each regional border in the frequency spectrum share zone, have very strong practical operation and be worth.
Description of drawings
Fig. 1 is the flow chart of a kind of empty time-frequency spectrum sharing method of dividing based on the zone of the embodiment of the present invention one;
Fig. 2 is that the empty time-frequency spectrum of dividing based on the zone in cognition wireless network in the embodiment of the present invention one is shared scene graph;
Fig. 3 is a kind of particular flow sheet based on the step B in the empty time-frequency spectrum sharing method of zone division of the embodiment of the present invention one;
Fig. 4 is a kind of particular flow sheet based on the step C in the empty time-frequency spectrum sharing method of zone division of the embodiment of the present invention one;
Fig. 5 be in a kind of empty time-frequency spectrum sharing method of dividing based on the zone of the embodiment of the present invention one cognitive data can with the using method flow chart of frequency spectrum detection combination;
Fig. 6 is the composition schematic diagram of a kind of empty time-frequency spectrum shared system of dividing based on the zone of the embodiment of the present invention two;
Fig. 7 is a kind of composition schematic diagram based on regional computing module in the empty time-frequency spectrum shared system of zone division of the embodiment of the present invention two;
Fig. 8 is a kind of composition schematic diagram based on region allocation module in the empty time-frequency spectrum shared system of zone division of the embodiment of the present invention two.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Embodiment one
A kind of empty time-frequency spectrum sharing method of dividing based on the zone is provided in the embodiment of the present invention one, and steps flow chart specifically comprises the following steps as shown in Figure 1:
Steps A: receive primary user's messaging parameter and cognitive user messaging parameter that primary user and cognitive user send respectively.
Wherein, primary user's messaging parameter comprises: the interference threshold that primary user position, primary user's Transmission probability threshold and primary user can bear.The cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
Step B: carry out the feature modeling in frequency spectrum share zone in conjunction with primary user's messaging parameter and cognitive user messaging parameter, the frequency spectrum share zone is divided into five zones.
Concrete; five zones comprise: primary user protection zone, time-domain spectral shared region, mix frequency spectrum share zone, spatial domain and the frequency spectrum share zone, the unrestricted spatial domain of power of frequency spectrum share zone, power limited system when empty; share as shown in Figure 2 based on the empty time-frequency spectrum that the zone is divided, concrete introduction figure is as follows:
1. primary user protection zone: in this zone, for the transfer of data that guarantees the primary user unaffected (be primary user's outage probability of communicating by letter need to less than threshold value), cognitive user can not be carried out transfer of data.
2. time-domain spectral shared region: due to this zone from the primary user close to, for guaranteeing that the cognitive user receiver is not subject to the interference of primary user's transmitter when transmitting, cognitive user is merely able to carry out time-domain spectral and shares, namely utilizing in primary user's channel idle authorizes frequency spectrum to carry out transfer of data, and can not carry out the spatial domain frequency spectrum share, namely adopt simultaneously with the primary user and authorize frequency range to communicate.
3. when empty in conjunction with the frequency spectrum share zone: the cognitive user this zone in both can adopt the spatial domain frequency spectrum share, also can adopt time-domain spectral shared.
4. the spatial domain frequency spectrum share of power-controlled system is regional: this regional cognitive user is because the restriction that is subject to the frequency spectrum detection ability is (because far away apart from the primary user, detect error excessive), simultaneously again in order to ensure to primary user's the interference interference threshold lower than the primary user, need to carry out power and control.
5. the uncontrolled spatial domain of power frequency spectrum share zone: this regional cognitive user due to the distance primary user farthest, can carry out the spatial domain frequency spectrum share with maximum transmission power, namely power is unrestricted.
Concrete, the feature modeling steps flow chart that carries out the frequency spectrum share zone in conjunction with primary user's messaging parameter and cognitive user messaging parameter specifically comprises as shown in Figure 3:
Step B1: calculate primary user protection zone outer radius R
1Calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, communication interruption probability is when reaching primary user's Transmission probability threshold, and the distance between the receiver at primary user's transmitter and its covering edge is primary user protection zone outer radius R
1At R
1With interior primary user's communication interruption probability all lower than threshold value, namely can both proper communication.
Step B2: calculate time-domain spectral shared region outer radius R
2Suppose that a certain cognitive user and primary user adopt the mandate frequency range to communicate (namely carrying out the spatial domain frequency spectrum share) simultaneously, when cognitive user and primary user carry out the spatial domain frequency spectrum share, distance between the area coverage of cognitive user transmitter and primary user's transmitter and cognitive user is inversely proportional to (because cognitive user is nearer apart from the primary user, the interference that is subject to primary user's transmitter is larger, cognitive user that can not proper communication is corresponding just more, thereby causes the area coverage of cognitive user transmitter to reduce).Calculate when reaching the minimum area coverage of cognitive user transmitter (being the area coverage threshold value) distance R between primary user's transmitter and cognitive user
2Calculate the signal to noise ratio of accepting of the cognitive user receiver that is in cognitive user transmitter smallest coverage edge according to the distance of distance, primary user's transmitter and the cognitive user receiver of cognitive user transmitter and cognitive user receiver, draw the expression formula of the track of cognitive user receiver, track for the circle, wherein the center of circle is the position of cognitive user transmitter, and the distance between cognitive user transmitter and primary user's transmitter is time-domain spectral shared region outer radius R
2
Circular is as follows: (1) calculates the signal to noise ratio of accepting of the cognitive user receiver be in cognitive user transmitter smallest coverage edge, and this signal to noise ratio is the function of the distance of the distance of cognitive user transmitter and cognitive user receiver and primary user's transmitter and cognitive user receiver.(2) can draw the expression formula of the track of this cognitive user receiver according to the functional expression in (1), this track is round, and the center of circle is the position of cognitive user transmitter, and radius is
(3) according to the position of cognitive user transmitter, can calculate the distance between cognitive user transmitter and primary user's transmitter.
Due in case lower than R
2, the cognitive user of carrying out the spatial domain frequency spectrum share can't reach the area coverage threshold value, and can not carry out the spatial domain frequency spectrum share and can only carry out time-domain spectral and share, therefore, R
2Be time-domain spectral shared region outer radius.
Step B3: mix frequency spectrum share zone outer radius R when calculating sky
3The upper bound and lower bound that the cognitive user false dismissal probability that according to frequency spectrum detection is and false alarm probability thresholding are determined detection threshold, can arrive according to calculating the subtraction function that the upper bound is cognitive user and primary user's transmitter distance, and the range-independence between lower bound and cognitive user and primary user's transmitter.When being sky with the distance between primary user's transmitter, the cognitive user when the upper bound is equal with lower bound mixes frequency spectrum share zone outer radius R
3
Step B4: the unrestricted spatial domain of rated output frequency spectrum share zone inside radius R
4Suppose that frequency spectrum share zone, the unrestricted spatial domain of power inside radius is unknown parameter X, calculate unknown parameter X to the accumulative total interference of all cognitive user of infinite point, and calculate when accumulative total and disturb when equaling interference threshold that the primary user can bear, the value of unknown parameter X is the regional inside radius R of power unrestricted spatial domain frequency spectrum share
4
Step B5: mix frequency spectrum share zone outer radius R during according to sky
3With the unrestricted spatial domain of power frequency spectrum share zone inside radius R
4Size judge whether the frequency spectrum share zone, spatial domain of power limited system exists, if mix frequency spectrum share zone outer radius R when empty
3Less than the unrestricted spatial domain of power frequency spectrum share zone inside radius R
4, the frequency spectrum share zone, spatial domain of power limited system exists, otherwise does not exist.
Step C: judge according to the cognitive user messaging parameter each cognitive user belongs to which zone in the frequency spectrum share zone, and adopt corresponding sharing mode to carry out sharing of sky time-frequency spectrum according to result of determination.
The steps flow chart of step C specifically comprises the following steps as shown in Figure 4:
Step C1: judge whether cognitive user belongs to the primary user protection zone, if it is cognitive user is not carried out the frequency spectrum share zone, otherwise enters step C2.
Step C2: judge whether cognitive user belongs to the time-domain spectral shared region, it is shared that if it is cognitive user is carried out time-domain spectral, otherwise enter step C3.
Step C3: judge when whether cognitive user belongs to sky and to mix the frequency spectrum share zone, if it is cognitive user is carried out time-domain spectral and is shared or the spatial domain frequency spectrum share, otherwise enters step C4.
Step C4: judge whether cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, and if it is cognitive user is carried out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters step C5.
Step C5: carry out the spatial domain frequency spectrum share with any power.
The using method flow process of cognitive database and frequency spectrum detection combination as shown in Figure 5 under heterogeneous network.
It is single transmit machine, multi-receiver that embodiments of the invention are applicable to primary user's network, and the transmission range between the transmitter and receiver of cognitive user is far smaller than the scene of the transmission range between primary user's transmitter and receiver simultaneously.Cognitive user adopts the mode of energy measuring to carry out frequency spectrum detection.If primary user's network is the scene of multi-transmitter multi-receiver, it can be divided into several single transmit machines, the subfield scape of multi-receiver, the method that adopts respectively the embodiment of the present invention to provide to each subfield scape gets final product.
By using said method, take full advantage of the spectrum opportunities on time domain in cognition wireless network, spatial domain frequency spectrum share and time-domain spectral are shared combination, thereby further promote spectrum utilization efficiency, computational methods are carried out on each regional border in the frequency spectrum share zone, have very strong practical operation and be worth.
Embodiment two
For achieving the above object, a kind of empty time-frequency spectrum shared system of dividing based on the zone also is provided in embodiments of the invention two, form schematic diagram as shown in Figure 6, specifically comprise:
Frequency spectrum share unit 620 is used for carrying out in conjunction with primary user's messaging parameter and cognitive user messaging parameter the feature modeling in frequency spectrum share zone, the frequency spectrum share zone is divided into five zones, specifically comprises: regional computing module 621, region allocation module 622 and region allocation information sending module 623.
Cognitive user messaging parameter reporting module 631 is used for sending the cognitive user messaging parameter to regional computing module 621.Wherein, the cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
The first computing module 6211 is used for calculating primary user protection zone outer radius R
1Calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, communication interruption probability is when reaching primary user's Transmission probability threshold, and the distance between the receiver at primary user's transmitter and its covering edge is primary user protection zone outer radius R
1
The second computing module 6212 is used for calculating time-domain spectral shared region outer radius R
2When cognitive user and primary user carry out the spatial domain frequency spectrum share, calculate the signal to noise ratio of accepting of the cognitive user receiver that is in cognitive user transmitter smallest coverage edge according to the distance of distance, primary user's transmitter and the cognitive user receiver of cognitive user transmitter and cognitive user receiver, draw the expression formula of the track of cognitive user receiver, track for the circle, wherein the center of circle is the position of cognitive user transmitter, and the distance between cognitive user transmitter and primary user's transmitter is time-domain spectral shared region outer radius R
2
The 3rd computing module 6213 mixes frequency spectrum share zone outer radius R when being used for calculating sky
3The upper bound and lower bound that the cognitive user false dismissal probability that according to frequency spectrum detection is and false alarm probability thresholding are determined detection threshold, the cognitive user when the upper bound equates with lower bound mix the regional outer radius R of frequency spectrum share when being sky with the distance between primary user's transmitter
3
The 4th computing module 6214 is used for the unrestricted spatial domain of rated output frequency spectrum share zone inside radius R
4Suppose that frequency spectrum share zone, the unrestricted spatial domain of power inside radius is unknown parameter X, calculate unknown parameter X to the accumulative total interference of all cognitive user of infinite point, and calculate when accumulative total and disturb when equaling interference threshold that the primary user can bear, the value of unknown parameter X is the regional inside radius R of power unrestricted spatial domain frequency spectrum share
4Circular is as follows: (1) calculates the signal to noise ratio of accepting of the cognitive user receiver be in cognitive user transmitter smallest coverage edge, and this signal to noise ratio is the function of the distance of the distance of cognitive user transmitter and cognitive user receiver and primary user's transmitter and cognitive user receiver.(2) can draw the expression formula of the track of this cognitive user receiver according to the functional expression in (1), this track is round, and the center of circle is the position of cognitive user transmitter, and radius is
(3) according to the position of cognitive user transmitter, can calculate the distance between cognitive user transmitter and primary user's transmitter.
The 5th regional determination module 6215 is mixed frequency spectrum share zone outer radius R when being used for according to sky
3With the unrestricted spatial domain of power frequency spectrum share zone inside radius R
4Size judge whether the frequency spectrum share zone, spatial domain of power limited system exists.If mix frequency spectrum share zone outer radius R when empty
3Less than the unrestricted spatial domain of power frequency spectrum share zone inside radius R
4, the frequency spectrum share zone, spatial domain of power limited system exists, otherwise does not exist.
By calculate with the frequency spectrum share zone be divided into primary user protection zone, time-domain spectral shared region, mix the frequency spectrum share zone when empty, frequency spectrum share zone, spatial domain and five zones, frequency spectrum share zone, the unrestricted spatial domain of power of power limited system, and output primary user protection zone outer radius R
1, time-domain spectral shared region outer radius R
2, mix frequency spectrum share zone outer radius R when empty
3, power unrestricted spatial domain frequency spectrum share zone outer radius R
4With the cognitive user positional information.
The first judge module 6221 is used for judging whether cognitive user belongs to the primary user protection zone, and if it is cognitive user is not carried out the frequency spectrum share zone, otherwise enters the second judge module 6222.
The second judge module 6222 is used for judge whether cognitive user belongs to the time-domain spectral shared region, and if it is cognitive user enters the time-domain spectral sharing module to carry out time-domain spectral shared, otherwise enters the 3rd judge module 6223.
The 3rd judge module 6223, be used for judging mixing frequency spectrum share zone when whether cognitive user belongs to sky, if it is cognitive user enters the time-domain spectral sharing module and carries out time-domain spectral and share or enter spatial domain frequency spectrum share module and carry out the spatial domain frequency spectrum share, otherwise enters the 4th judge module 6224.
The 4th judge module 6224, be used for judging whether cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, if it is cognitive user enters spatial domain frequency spectrum share module and carries out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters the 5th module 6225.
The 5th module 6225 enters spatial domain frequency spectrum share module for cognitive user and carries out the spatial domain frequency spectrum share with any power.
By the judgement of above-mentioned judge module, export at last the information that cognitive user is belonged to which zone in frequency spectrum share zone, and send to the frequency spectrum share mode decision module 632 in the cognitive user unit.
The data that frequency spectrum share mode decision module 632 receiving area assignment information sending modules 623 send, and transfer corresponding frequency spectrum share module and carry out frequency spectrum share.Frequency spectrum share module wherein comprises time-domain spectral sharing module 633 and spatial domain frequency spectrum share module 634.Whether time-domain spectral sharing module 633 is at first idle by frequency spectrum detection technology for detection mandate frequency range, and then do not carry out transfer of data during the use authority frequency range the primary user.Spatial domain frequency spectrum share module 634 adopts simultaneously with the primary user and authorizes frequency range to communicate under the prerequisite of interfere with primary users not, specifically comprises: the spatial domain frequency spectrum share of power limited system and power unrestricted spatial domain frequency spectrum share.
Pass through said system, take full advantage of the spectrum opportunities on time domain in cognition wireless network, spatial domain frequency spectrum share and time-domain spectral are shared combination, thereby further promote spectrum utilization efficiency, computational methods are carried out on each regional border in the frequency spectrum share zone, have very strong practical operation and be worth.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. an empty time-frequency spectrum sharing method of dividing based on the zone, is characterized in that, described method specifically comprises:
A: receive primary user's messaging parameter and cognitive user messaging parameter that primary user and cognitive user send respectively;
B: carry out the feature modeling in frequency spectrum share zone in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter, described frequency spectrum share zone is divided into five zones;
C: judge according to described cognitive user messaging parameter each cognitive user belongs to which zone in described frequency spectrum share zone, and adopt corresponding sharing mode to carry out sharing of sky time-frequency spectrum according to result of determination.
2. the method for claim 1, is characterized in that, described primary user's messaging parameter comprises: the interference threshold that primary user position, primary user's Transmission probability threshold and primary user can bear; Described cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
3. the method for claim 1; it is characterized in that, describedly described frequency spectrum share zone is divided into five zones specifically comprises: primary user protection zone, time-domain spectral shared region, mix frequency spectrum share zone, spatial domain and the frequency spectrum share zone, the unrestricted spatial domain of power of frequency spectrum share zone, power limited system when empty.
4. the method for claim 1, is characterized in that, the described feature modeling that carries out the frequency spectrum share zone in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter specifically comprises:
B1: calculate primary user protection zone outer radius, calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, described communication interruption probability is when reaching described primary user's Transmission probability threshold, and the distance between the receiver at described primary user's transmitter and its covering edge is described primary user protection zone outer radius;
B2: calculate time-domain spectral shared region outer radius, when described cognitive user and described primary user carry out the spatial domain frequency spectrum share, distance according to cognitive user transmitter and cognitive user receiver, the distance of described primary user's transmitter and described cognitive user receiver is calculated the signal to noise ratio of accepting of the cognitive user receiver be in described cognitive user transmitter smallest coverage edge, draw the expression formula of the track of described cognitive user receiver, described track for the circle, wherein the center of circle is the position of described cognitive user transmitter, the distance between described cognitive user transmitter and primary user's transmitter is described time-domain spectral shared region outer radius,
B3: mix the regional outer radius of frequency spectrum share when calculating sky, the upper bound and lower bound that the described cognitive user false dismissal probability that according to frequency spectrum detection is and described false alarm probability thresholding are determined detection threshold, the cognitive user when the described upper bound equates with described lower bound and the distance between primary user's transmitter are the described regional outer radius of frequency spectrum share of mixing when empty;
B4: frequency spectrum share zone, the unrestricted spatial domain of rated output inside radius, suppose that frequency spectrum share zone, the unrestricted spatial domain of described power inside radius is unknown parameter, calculating described unknown parameter to the accumulative total of all cognitive user of infinite point disturbs, and calculate when described accumulative total and disturb when equaling interference threshold that described primary user can bear, the value of described unknown parameter is the regional inside radius of described power unrestricted spatial domain frequency spectrum share;
B5: the size of mixing frequency spectrum share zone outer radius and frequency spectrum share zone, the unrestricted spatial domain of described power inside radius during according to described sky judges whether the frequency spectrum share zone, spatial domain of described power limited system exists, if mix the regional outer radius of frequency spectrum share during described sky less than frequency spectrum share zone, the unrestricted spatial domain of described power inside radius, the frequency spectrum share zone, spatial domain of described power limited system exists, otherwise does not exist.
5. the method for claim 1, is characterized in that, described step C specifically comprises:
C1: judge whether described cognitive user belongs to described primary user protection zone, if it is described cognitive user is not carried out the frequency spectrum share zone, otherwise enters step C2;
C2: judge whether described cognitive user belongs to the time-domain spectral shared region, it is shared that if it is described cognitive user is carried out time-domain spectral, otherwise enter step C3;
C3: judge when whether described cognitive user belongs to sky and to mix the frequency spectrum share zone, if it is described cognitive user is carried out time-domain spectral and is shared or the spatial domain frequency spectrum share, otherwise enters step C4;
C4: judge whether described cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, and if it is described cognitive user is carried out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters step C5;
C5: carry out the spatial domain frequency spectrum share with any power.
6. an empty time-frequency spectrum shared system of dividing based on the zone, is characterized in that, described system specifically comprises:
Primary user unit, frequency spectrum share unit and cognitive user unit;
Described primary user unit comprises primary user's messaging parameter reporting module, is used for sending primary user's messaging parameter;
Described frequency spectrum share unit is used for carrying out in conjunction with described primary user's messaging parameter and described cognitive user messaging parameter the feature modeling in frequency spectrum share zone, described frequency spectrum share zone is divided into five zones, specifically comprises: regional computing module, region allocation module and region allocation information sending module;
Described cognitive user unit is used for judging according to described cognitive user messaging parameter each cognitive user belongs to which zone in described frequency spectrum share zone, and adopt corresponding sharing mode to carry out sharing of sky time-frequency spectrum according to result of determination, specifically comprise: cognitive user messaging parameter reporting module, frequency spectrum share mode decision module, time-domain spectral sharing module and spatial domain frequency spectrum share module.
7. system as claimed in claim 6, it is characterized in that, the cognitive user messaging parameter that primary user's messaging parameter that the described primary user's messaging parameter reporting module of described regional computing module reception sends and described cognitive user messaging parameter reporting module send carries out the feature modeling in described frequency spectrum share zone;
Wherein said primary user's messaging parameter comprises the interference threshold that primary user position, primary user's Transmission probability threshold and primary user can bear; Described cognitive user messaging parameter comprises: cognitive user position, cognitive user false dismissal probability and false alarm probability thresholding.
8. system as claimed in claim 6; it is characterized in that, described regional computing module with described frequency spectrum share zone be divided into primary user protection zone, time-domain spectral shared region, mix the frequency spectrum share zone when empty, frequency spectrum share zone, spatial domain and five zones, frequency spectrum share zone, the unrestricted spatial domain of power of power limited system.
9. system as claimed in claim 6, is characterized in that, described regional computing module specifically comprises:
The first computing module, the second computing module, the 3rd computing module, the 4th computing module and the 5th regional determination module;
Described the first computing module, be used for to calculate primary user protection zone outer radius, calculate the communication interruption probability that primary user's transmitter covers the receiver at edge, described communication interruption probability is when reaching described primary user's Transmission probability threshold, and the distance between the receiver at described primary user's transmitter and its covering edge is described primary user protection zone outer radius;
described the second computing module, be used for calculating time-domain spectral shared region outer radius, when described cognitive user and described primary user carry out the spatial domain frequency spectrum share, distance according to cognitive user transmitter and cognitive user receiver, the distance of described primary user's transmitter and described cognitive user receiver is calculated the signal to noise ratio of accepting of the cognitive user receiver be in described cognitive user transmitter smallest coverage edge, draw the expression formula of the track of described cognitive user receiver, described track for the circle, wherein the center of circle is the position of described cognitive user transmitter, the distance between described cognitive user transmitter and primary user's transmitter is described time-domain spectral shared region outer radius,
Described the 3rd computing module, mix the regional outer radius of frequency spectrum share when being used for calculating sky, the upper bound and lower bound that the described cognitive user false dismissal probability that according to frequency spectrum detection is and described false alarm probability thresholding are determined detection threshold, the cognitive user when the described upper bound equates with described lower bound and the distance between primary user's transmitter are the described regional outer radius of frequency spectrum share of mixing when empty;
Described the 4th computing module, be used for frequency spectrum share zone, the unrestricted spatial domain of rated output inside radius, suppose that frequency spectrum share zone, the unrestricted spatial domain of described power inside radius is unknown parameter, calculating described unknown parameter to the accumulative total of all cognitive user of infinite point disturbs, and calculate when described accumulative total and disturb when equaling interference threshold that described primary user can bear, the value of described unknown parameter is the regional inside radius of described power unrestricted spatial domain frequency spectrum share;
The size of mixing frequency spectrum share zone outer radius and frequency spectrum share zone, the unrestricted spatial domain of described power inside radius when described the 5th regional determination module is used for according to described sky judges whether the frequency spectrum share zone, spatial domain of described power limited system exists, if mix the regional outer radius of frequency spectrum share during described sky less than frequency spectrum share zone, the unrestricted spatial domain of described power inside radius, the frequency spectrum share zone, spatial domain of described power limited system exists, otherwise does not exist.
10. system as claimed in claim 6, is characterized in that, described region allocation module comprises: the first judge module, the second judge module, the 3rd judge module, the 4th judge module and the 5th module;
Described the first judge module is used for judging whether described cognitive user belongs to described primary user protection zone, and if it is described cognitive user is not carried out the frequency spectrum share zone, otherwise enters described the second judge module;
Described the second judge module is used for judging whether described cognitive user belongs to the time-domain spectral shared region, and if it is described cognitive user enters described time-domain spectral sharing module and carries out time-domain spectral and share, otherwise enters described the 3rd judge module;
Described the 3rd judge module, be used for judging mixing frequency spectrum share zone when whether described cognitive user belongs to sky, if it is described cognitive user enters described time-domain spectral sharing module and carries out time-domain spectral and share or enter described spatial domain frequency spectrum share module and carry out the spatial domain frequency spectrum share, otherwise enters described the 4th judge module;
Described the 4th judge module, be used for judging whether described cognitive user belongs to the frequency spectrum share zone, spatial domain of power limited system, if it is described cognitive user enters described spatial domain frequency spectrum share module and carries out the spatial domain frequency spectrum share with the power lower than power-limiting, otherwise enters described the 5th module;
Described the 5th module enters described spatial domain frequency spectrum share module for described cognitive user and carries out the spatial domain frequency spectrum share with any power.
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