CN105516993B - Frequency spectrum resource allocation method and device in a kind of cognition network - Google Patents

Frequency spectrum resource allocation method and device in a kind of cognition network Download PDF

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CN105516993B
CN105516993B CN201410493917.XA CN201410493917A CN105516993B CN 105516993 B CN105516993 B CN 105516993B CN 201410493917 A CN201410493917 A CN 201410493917A CN 105516993 B CN105516993 B CN 105516993B
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user equipment
cognitive
frequency band
detection
data transmission
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CN105516993A (en
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陈丹
刘磊
聂昌
邱勇
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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Abstract

Frequency spectrum resource allocation method and device in a kind of cognition network of the embodiment of the present invention offer, are related to the communications field, can either effectively improve the availability of frequency spectrum, and can effectively reduce the interference between primary user device and cognitive user equipment.In the first default detection period, detecting state, detection probability and the non-false alarm probability of authorized spectrum band in primary user's network are obtained；When detecting state is " spare time ", according to detecting state and non-false alarm probability selection data transmission policies；When detecting state is " busy ", data transmission policies are selected according to detecting state and detection probability；Cognitive user equipment dispatch order message into cognitive user network, the notification message is used to indicate the cognitive user equipment to be carried out data transmission using the data transmission policies.Frequency spectrum resource allocation method and device are for distributing frequency spectrum resource in the cognition network.

Description

Spectrum resource allocation method and device in cognitive network
Technical Field
The invention relates to the field of communication, in particular to a method and a device for allocating spectrum resources in a cognitive network.
Background
The cognitive network includes a master user network and a cognitive user network, and specifically may be an LTE (Long term evolution) stereo heterogeneous network, for example, as shown in fig. 1, the LTE stereo heterogeneous network is a schematic diagram of an LTE stereo heterogeneous network architecture, and includes a master user network (also called Macro cell) and a cognitive user network (also called micro cell network Smallcell), and generally adopts a same-frequency networking manner, that is, the master user network and the cognitive user network share all spectrum resources authorized to the master user network, in such a networking scheme, for master user devices of the master user network that are farther from a master user network base station (eNB) and closer to a cognitive user network base station (SC-AP), strong downlink interference of the cognitive user network base station is easily received; meanwhile, the transmission power of the cognitive user network base station is generally far less than that of the master user network base station, so that the master user network base station is easy to cause strong downlink interference to the cognitive user equipment of the cognitive user network.
In the prior art, cognitive user equipment can adopt cognitive radio technology, monitors the detection state of the authorized frequency band of main user equipment, works as when the detection state of the authorized frequency band is "idle", cognitive user equipment uses the authorized frequency band to communicate, works as when the detection state of the authorized frequency band is "busy", no business operation is carried out, thus the frequency spectrum utilization rate is relatively low, and if wrong detection probability exists, the cognitive user equipment can be used when the detection state of the authorized frequency band is "busy", the authorized frequency band is used for data transmission, and interference to the main user equipment is caused. Therefore, how to improve the spectrum utilization rate and reduce the interference between the primary user equipment and the cognitive user equipment is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a method and a device for allocating spectrum resources in a cognitive network, which can effectively improve the spectrum utilization rate and effectively reduce the interference between master user equipment and cognitive user equipment.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a method for allocating spectrum resources in a cognitive network is provided, including:
acquiring a detection state, a detection probability and a non-false alarm probability of an authorized frequency band in a master user network in a first preset detection period;
when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value;
if the non-false alarm probability is larger than a first preset threshold value, selecting a data transmission strategy;
if the non-false alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods;
when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value;
if the detection probability is larger than a second preset threshold value, selecting a data transmission strategy;
if the detection probability is less than or equal to a second preset threshold value, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection time period;
sending a notification message to cognitive user equipment in a cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy for data transmission;
the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
In a second aspect, an apparatus for allocating spectrum resources in a cognitive network is provided, including:
the processing unit is used for acquiring the detection state, the detection probability and the non-false alarm probability of the authorized frequency band in the master user network in a first preset detection period;
the processing unit is further to:
when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value;
if the non-false alarm probability is larger than a first preset threshold value, selecting a data transmission strategy;
if the non-false alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods;
when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value;
if the detection probability is larger than a second preset threshold value, selecting a data transmission strategy;
if the detection probability is less than or equal to a second preset threshold value, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection time period;
a sending unit, configured to send a notification message to a cognitive user device in a cognitive user network, where the notification message is used to instruct the cognitive user device to perform data transmission using the data transmission policy;
the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
The embodiment of the invention provides a method and a device for allocating spectrum resources in a cognitive network. The method for allocating the spectrum resources in the cognitive network comprises the following steps: firstly, acquiring a detection state, a detection probability and a non-false alarm probability of an authorized frequency band in a master user network in a first preset detection period; then, when the detection state is idle, judging that the non-false-alarm probability is greater than a first preset threshold value, and selecting a data transmission strategy; judging whether the non-false alarm probability is less than or equal to a first preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period; when the detection state is busy, judging that the detection probability is greater than a second preset threshold value, and selecting a data transmission strategy; judging that the detection probability is less than or equal to a second preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection period; sending a notification message to cognitive user equipment in a cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy for data transmission; the data transmission strategy is used for deciding an authorized frequency band used in data transmission between the cognitive user equipment, the transmitting power of the cognitive user equipment and a relay node meeting conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an LTE stereoheterogeneous network architecture provided in the prior art;
fig. 2 is a flowchart of a method for allocating spectrum resources in a cognitive network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an LTE stereoheterogeneous network architecture according to an embodiment of the present invention;
fig. 4 is a flowchart of another method for allocating spectrum resources in a cognitive network according to an embodiment of the present invention;
fig. 4a is a flowchart of a method for allocating spectrum resources in a cognitive network according to another embodiment of the present invention;
fig. 4b is a flowchart of a method for allocating spectrum resources in a cognitive network according to another embodiment of the present invention;
FIG. 5 is a graph illustrating the relationship between false alarm probability and false detection probability according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a spectrum resource allocation apparatus in a cognitive network according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another spectrum resource allocation apparatus in a cognitive network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for allocating spectrum resources in a cognitive network, which comprises the following steps of:
step 101, acquiring a detection state, a detection probability and a non-false alarm probability of an authorized frequency band in a master user network in a first preset detection period.
And 102a, when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value.
And 103, selecting a data transmission strategy if the non-false alarm probability is greater than a first preset threshold.
And 104, if the non-false-alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods.
And 102b, when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value.
And 105, selecting a data transmission strategy if the detection probability is greater than a second preset threshold.
And 106, if the detection probability is less than or equal to a second preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network, which is acquired in the second preset detection time period.
Step 107, sending a notification message to the cognitive user equipment in the cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy for data transmission; the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
In this way, firstly, in a first preset detection period, the detection state, the detection probability and the non-false alarm probability of the authorized frequency band in the master user network are obtained; then, when the detection state is idle, judging that the non-false-alarm probability is greater than a first preset threshold value, and selecting a data transmission strategy; judging whether the non-false alarm probability is less than or equal to a first preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period; when the detection state is busy, judging that the detection probability is greater than a second preset threshold value, and selecting a data transmission strategy; judging that the detection probability is less than or equal to a second preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection period; and then sending a notification message to the cognitive user equipment in the cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy to perform data transmission, so that compared with the prior art, the frequency spectrum utilization rate is effectively improved, and the interference between the master user equipment and the cognitive user equipment is effectively reduced.
It should be noted that the detection states include "busy" and "idle", where the "busy" indicates that there is data transmission on the authorized frequency band, the "idle" indicates that there is no data transmission on the authorized frequency band, the detection probability indicates a probability that the detection state of the authorized frequency band is "busy" and the actual state is "busy", and the non-false alarm probability indicates a probability that the detection state of the authorized frequency band is "idle" and the actual state is "idle".
As shown in fig. 3, forThe spectrum resource allocation method provided by the invention provides a schematic diagram of a stereo heterogeneous network structure, and the schematic diagram comprises an LET core network 201, a spectrum resource allocation device 202, a primary user network 203 and a cognitive user network 204. The master user network 203 and the cognitive user network 204 form a stereo heterogeneous network, and the master user network 203 comprises a source master user device PT2031. Target master user equipment PR2032 and a base station 2033, the cognitive user network 204 comprises a source cognitive user equipment ST2041. Destination cognitive user equipment SR2042. A first relay node 2043, a second relay node 2044, and a third relay node 2045. The spectrum resource allocation apparatus 202 is connected to the LET core network 201 and the base station 2033, respectively, and the spectrum resource allocation apparatus 202 performs wireless transmission with the first relay node 2043, the second relay node 2044, and the third relay node 2045, respectively. The spectrum resource allocation device 202 may listen to the licensed frequency band in the primary user network 203 using the cognitive radio technology, so that the cognitive user network 204 uses the licensed frequency band available in the primary user network 203 for communication.
An embodiment of the present invention provides a method for allocating spectrum resources in a cognitive network, which is applied to a spectrum resource allocation device in a stereo heterogeneous network shown in fig. 3, and as shown in fig. 4 to 4b, the method includes:
and 301, intercepting an authorized frequency band in the master user network.
The frequency spectrum resource allocation device listens to N authorized frequency bands (Band _ 1-Band _ N) and monitors whether P exists on each authorized frequency BandTTo PRThe authorized frequency band is a frequency band authorized to the master user equipment by a base station (eNB) in the master user network, so that the master user equipment can use the authorized frequency band for data transmission, and N is an integer greater than or equal to 1. The embodiment of the invention assumes that Band _ n is intercepted.
Step 302, in a first preset detection period, obtaining a detection state, a detection probability and a non-false alarm probability of an authorized frequency band in a master user network.
The detection state comprises busy and idle, the busy indicates that data transmission exists on the authorized frequency band, the idle indicates that no data transmission exists on the authorized frequency band, the detection probability indicates that the detection state of the authorized frequency band is busy and the actual state is busy, the non-false-alarm probability indicates that the detection state of the authorized frequency band is idle and the actual state is idle, the false-detection probability indicates that the detection state of the authorized frequency band is idle and the actual state is busy, and the false-alarm probability indicates that the detection state of the authorized frequency band is busy and the actual state is idle.
In the embodiment of the invention, if no data transmission exists on the Band _ n in the authorized frequency Band, the state of the Band _ n is judged to be idle and is marked as H0:Xn(t) ═ 1; if data transmission exists on the authorized frequency Band _ n, the state of the Band _ n is judged to be busy and is marked as H1:Xn(t) is 0. The detection probability may be expressed as PD(τ, ε), the false alarm probability may be expressed as PFA(τ, ε), the probability of false detection can be expressed as 1-PD(τ, ε), the non-false alarm probability may be expressed as 1-PFA(τ, ε), where τ represents a first preset detection period and ε represents a detection threshold preset threshold. As shown in table 1, a probability table of occurrence of the detection state of the licensed band.
Table 1 probability table of occurrence of detection state of licensed band
As shown in fig. 4a, when the detection status of the licensed band is "idle" in the first preset detection period, after step 302, steps 303 to 3012 are performed.
Step 303, determining whether the non-false alarm probability is greater than a first preset threshold.
If the non-false alarm probability is greater than the first preset threshold, the spectrum resource allocation device considers that the probability value of the idle authorized frequency band is greater, step 304 is executed, and the throughput rates of all relay nodes in the cognitive network are calculated by adopting a shannon formula according to the first transmission time period, the channel bandwidth of the authorized frequency band, the signal power and the first noise power. If the non-false alarm probability is less than or equal to the first preset threshold, go to step 306.
And step 304, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to the first transmission time interval, the channel bandwidth of the authorized frequency band, the signal power and the first noise power. Step 305 is performed.
The first transmission time interval is a time interval of data transmission between the cognitive user equipment and the relay node after the first preset detection time interval, and the first noise power includes the noise power of the authorized frequency band and does not include the noise power of interference of the master user equipment to the cognitive user equipment in the master user network.
Specifically, the throughput rates of all relay nodes in the cognitive network can be calculated according to the formula (1.1),
wherein,for a first transmission period, N0BnIs the power of the first noise, and,andas signal power, BnIs authorized for the nChannel bandwidth of frequency band, N0In order to be able to measure the noise power spectral density,cognizant user equipment S for sourceTThe maximum transmit power of the antenna is determined,cognizant user equipment S for sourceTAnd the average value of the channel gain between the relay nodes,cognizant user equipment S for sourceTWith the target cognitive user equipment SRThe transmit power of the relay node used for data transmission therebetween,cognitive user equipment for purposes SRAnd the average of the channel gains between the relay nodes.
It is noted thatThe value 1 in the above description is a planning period for the user equipment to perform data transmission, which is defined when the throughput rate is calculated according to the shannon formula, because the first preset detection period τ exists in the planning period "1", the first preset detection period needs to be subtracted from the planning period "1", and because the relay node is adopted in the present invention to forward the data transmission between the source cognitive user equipment and the destination cognitive user equipment in order to improve the throughput rate of the link between the source cognitive user equipment and the destination cognitive user equipment, therefore, the period obtained by subtracting the first preset detection period from the planning period "1" is divided by 2 to obtain the first transmission period for the cognitive user equipment and the relay node to perform data transmission.
And 305, selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network. Step 3012 is performed.
The spectrum resource allocation device stores the maximum transmitting power of all the cognitive user equipment in the cognitive user network, and can select the source cognitive user equipment STThe maximum transmit power of. The spectrum resource allocation device can select the relay node with the maximum throughput rate in the cognitive network according to the calculation result, and the relay node is used for data transmission among the cognitive user equipment.
Step 306, obtaining the detection state of the authorized frequency band in a second preset detection period. Step 307 is performed.
When the detection state of the authorized frequency band is idle in the first preset detection period, and the non-false-alarm probability is smaller than or equal to the first preset threshold value, the intercepted authorized frequency band is detected again, and the detection state of the authorized frequency band in the second preset detection period is obtained.
And 307, judging whether the detection state of the authorized frequency band is idle in the second preset detection time period.
If the detection state of the authorized frequency band is "idle" in the second preset detection period, the frequency spectrum resource allocation device considers that the probability value of the idle authorized frequency band is large, step 308 is executed, and the throughput rates of all relay nodes in the cognitive network are calculated by adopting a shannon formula according to the second transmission period, the channel bandwidth of the authorized frequency band, the signal power and the first noise power. The embodiment of the invention assumes a source cognitive user equipment STMay be expressed as
If the detection state of the authorized frequency band is "busy" in the second preset detection period, the probability value that the authorized frequency band is busy is considered to be larger by the spectrum resource allocation device, step 309 is executed, the throughput rates of all relay nodes in the cognitive network are calculated by adopting a shannon formula according to the second transmission period, the channel bandwidth of the authorized frequency band, the signal power and the second noise power, and the transmission power of the cognitive user equipment is calculated.
And 308, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to the second transmission time interval, the channel bandwidth of the authorized frequency band, the signal power and the first noise power. Step 3010 is performed.
The second transmission time interval is a time interval of data transmission between the cognitive user equipment and the relay node after the second preset detection time interval, and the first noise power includes the noise power of the authorized frequency band and does not include the noise power of interference of the master user equipment to the cognitive user equipment in the master user network.
Specifically, the throughput rates of all relay nodes in the cognitive network may be calculated according to formula (1.2):
wherein,for a second transmission period, N0BnIs the power of the first noise, and,andas signal power, BnFor channel bandwidth of the nth licensed band, N0In order to be able to measure the noise power spectral density,cognizant user equipment S for sourceTThe maximum transmit power of the antenna is determined,cognizant user equipment S for sourceTAveraging of channel gain with relay nodesThe value of the one or more of,cognizant user equipment S for sourceTWith the target cognitive user equipment SRThe transmit power of the relay node used for data transmission therebetween,cognitive user equipment for purposes SRAnd the average of the channel gains between the relay nodes.
It is noted thatThe value 1 in the above description is a planning period for the user equipment to perform data transmission, which is defined when the throughput rate is calculated according to the shannon formula, because two preset detection periods, in which the second preset detection period τ and the first preset detection period τ are continuous, exist in the planning period "1", the first preset detection period and the second preset detection period need to be subtracted in the planning period "1", and because the throughput rate of the link between the source cognitive user equipment and the destination cognitive user equipment is improved, the relay node is adopted to forward the data transmission between the source cognitive user equipment and the destination cognitive user equipment, and therefore, the period, in which the first preset detection period and the second preset detection period are subtracted in the planning period "1", is divided by 2 to obtain the first transmission period for the cognitive user equipment and the relay node to perform data transmission.
Step 3010, select the authorized frequency band, the maximum transmit power of the cognitive user equipment, and the relay node with the maximum throughput rate in the cognitive network. Step 3012 is performed.
The spectrum resource allocation device stores the maximum transmitting power of all the cognitive user equipment in the cognitive user network, and can select the source cognitive user equipment STThe maximum transmit power of. The frequency spectrum resource allocation device can select the relay node with the maximum throughput rate in the cognitive network according to the calculation result, and the relay node is used for setting the cognitive userAnd data transmission is carried out between the devices.
Step 309, calculating the throughput rates of all relay nodes in the cognitive network and calculating the transmission power of the cognitive user equipment by adopting a shannon formula according to the second transmission time period, the channel bandwidth of the authorized frequency band, the signal power and the second noise power. Step 3011 is performed.
The second transmission time interval is a time interval of data transmission between the cognitive user equipment and the relay node after the second preset detection time interval, and the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band. And the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment to the main user equipment.
Specifically, the throughput rates of all relay nodes in the cognitive network may be calculated according to formula (1.3):
wherein,for the second period of transmission time,in order to be the second noise power, the first noise power,andas signal power, BnFor channel bandwidth of the nth licensed band, N0In order to be able to measure the noise power spectral density,source aware user equipmentSTThe transmission power of the antenna is set to be,cognizant user equipment S for sourceTAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTThe transmission power of the antenna is set to be,as a primary user equipment PTAnd the average value of the channel gain between the relay nodes,cognizant user equipment S for sourceTWith the target cognitive user equipment SRThe transmit power of the relay node used for data transmission therebetween,cognitive user equipment for purposes SRAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTWith the target cognitive user equipment SRAverage value of channel gain in between.
Further, the transmission power of the relay node is less than or equal to a threshold value at which the transmission power of the relay node interferes with the primary user equipment, that is, the interrupt node needs to satisfy a conditionWherein,in order to be the transmission power of the relay node,compliance parameter ofIs used as the index distribution of (1).
Specifically, the transmission power of the cognitive user equipment may be calculated according to formula (1.4):
step 3011, select the authorized frequency band, the transmission power of the cognitive user equipment, and the relay node with the maximum throughput rate in the cognitive network. Step 3012 is performed.
Source cognitive user equipment S obtained by selecting calculation by spectrum resource allocation deviceTThe transmit power of. The spectrum resource allocation device can select the relay node with the maximum throughput rate in the cognitive network according to the calculation result, and the relay node is used for data transmission among the cognitive user equipment.
Therefore, the spectrum resource allocation method of the embodiment of the invention judges the detection state of the authorized frequency band according to the detection state and the non-false alarm probability, when the detection state of the authorized frequency band is busy and the non-false alarm probability is less than or equal to the first preset threshold, the detection state of the authorized frequency band is detected again in the second preset detection period, and whether the authorized frequency band is the frequency band available for data transmission between the cognitive user equipment is judged, so that the spectrum utilization rate is effectively improved; meanwhile, the transmitting power of the cognitive user equipment is reduced, and a proper relay node is selected to assist the cognitive user equipment in data transmission, so that the interruption probability of data transmission between the main user equipment is effectively reduced, the interference between the main user equipment and the cognitive user equipment is effectively reduced, and the throughput rate of the cognitive user equipment is improved.
And step 3012, sending a notification message to the cognitive user equipment.
The notification message is used for indicating the cognitive user equipment to use the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node of the maximum throughput rate in the cognitive network, or selecting the authorized frequency band, the transmitting power of the cognitive user equipment obtained through calculation and the relay node of the maximum throughput rate in the cognitive network, wherein the transmitting power of the relay node is smaller than or equal to a threshold value of interference caused by the transmitting power of the relay node to the main user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value of interference caused by the cognitive user equipment to the main user equipment.
As shown in fig. 4b, when the detection status of the licensed band is "busy" in the first preset detection period, after step 302, steps 3013 to 3021 are performed.
And 3013, determining whether the detection probability is greater than a second preset threshold.
If the detection probability is greater than the second preset threshold, the spectrum resource allocation device determines that the probability value of the authorized frequency band being busy is greater, step 3014 is executed, the throughput rates of all relay nodes in the cognitive network are calculated by adopting a shannon formula according to the first transmission time period, the channel bandwidth of the authorized frequency band, the signal power and the second noise power, and the transmitting power of the cognitive user equipment is calculated. If the detection probability is less than or equal to a second preset threshold, go to step 3016.
And 3014, calculating throughput rates of all relay nodes in the cognitive network and calculating transmission power of the cognitive user equipment by adopting a shannon formula according to the first transmission time interval, the channel bandwidth of the authorized frequency band, the signal power and the second noise power. Step 3015 is performed.
The first transmission time interval is a time interval of data transmission between the cognitive user equipment and the relay node after the first preset detection time interval, and the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band. And the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment to the main user equipment.
Specifically, the throughput rates of all relay nodes in the cognitive network may be calculated according to formula (1.6):
wherein,for the first period of transmission,in order to be the second noise power, the first noise power,andas signal power, BnFor channel bandwidth of the nth licensed band, N0In order to be able to measure the noise power spectral density,cognizant user equipment S for sourceTThe transmission power of the antenna is set to be,cognizant user equipment S for sourceTAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTThe transmission power of the antenna is set to be,as a primary user equipment PTAnd the average value of the channel gain between the relay nodes,cognizant user equipment S for sourceTWith the target cognitive user equipment SRThe transmit power of the relay node used for data transmission therebetween,cognitive user equipment for purposes SRAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTWith the target cognitive user equipment SRAverage value of channel gain in between.
Further, the transmission power of the relay node is less than or equal to a threshold value at which the transmission power of the relay node interferes with the primary user equipment, that is, the interrupt node needs to satisfy a conditionWherein,in order to be the transmission power of the relay node,compliance parameter ofIs used as the index distribution of (1).
Specifically, the transmission power of the cognitive user equipment may be calculated according to formula (1.4):
and 3015, selecting the authorized frequency band, the transmission power of the cognitive user equipment, and the relay node with the maximum throughput rate in the cognitive network. Step 3021 is performed.
Source cognitive user equipment S obtained by selecting calculation by spectrum resource allocation deviceTThe transmit power of. The spectrum resource allocation device can select the relay node with the maximum throughput rate in the cognitive network according to the calculation result, and the relay node is used for data transmission among the cognitive user equipment.
Step 3016, obtain the detection state of the authorized frequency band in the second preset detection period. Step 3017 is performed.
When the detection state of the authorized frequency band is busy in the first preset detection period, and the detection probability is smaller than or equal to the second preset threshold value, the intercepted authorized frequency band is detected again, and the detection state of the authorized frequency band in the second preset detection period is obtained.
Step 3017, determining whether the detection state of the authorized frequency band is "idle" in the second preset detection period.
If the detection state of the authorized frequency band is "idle" in the second preset detection period, the probability value that the authorized frequency band is busy is considered to be larger by the spectrum resource allocation device, step 3018 is executed, the throughput rates of all relay nodes in the cognitive network are calculated by adopting a shannon formula according to the second transmission period, the channel bandwidth of the authorized frequency band, the signal power and the second noise power, and the transmission power of the cognitive user equipment is calculated. If the detection status of the authorized frequency band is "busy" in the second preset detection period, go to step 3019.
And 3018, calculating throughput rates of all relay nodes in the cognitive network and calculating transmission power of the cognitive user equipment by using a shannon formula according to a second transmission time interval, a channel bandwidth of an authorized frequency band, signal power and second noise power. Step 3020 is performed.
The second transmission time interval is a time interval of data transmission between the cognitive user equipment and the relay node after the second preset detection time interval, and the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band. And the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment to the main user equipment.
Specifically, the throughput rates of all relay nodes in the cognitive network may be calculated according to formula (1.3):
wherein,for the second period of transmission time,in order to be the second noise power, the first noise power,andas signal power, BnFor channel bandwidth of the nth licensed band, N0In order to be able to measure the noise power spectral density,cognizant user equipment S for sourceTThe transmission power of the antenna is set to be,cognizant user equipment S for sourceTAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTThe transmission power of the antenna is set to be,as a primary user equipment PTAnd the average value of the channel gain between the relay nodes,cognizant user equipment S for sourceTWith the target cognitive user equipment SRThe transmit power of the relay node used for data transmission therebetween,cognitive user equipment for purposes SRAnd the average value of the channel gain between the relay nodes,as a primary user equipment PTWith the target cognitive user equipment SRAverage value of channel gain in between.
Further, the transmission power of the relay node is less than or equal to a threshold value at which the transmission power of the relay node interferes with the primary user equipment, that is, the interrupt node needs to satisfy a conditionWherein,in order to be the transmission power of the relay node,compliance parameter ofIs used as the index distribution of (1).
Specifically, the transmission power of the cognitive user equipment may be calculated according to formula (1.4):
step 3020, selecting the authorized frequency band, the transmission power of the cognitive user equipment, and the relay node with the maximum throughput rate in the cognitive network. Step 3021 is performed.
Source cognitive user equipment S obtained by selecting calculation by spectrum resource allocation deviceTThe transmit power of. The spectrum resource allocation device can select the relay node with the maximum throughput rate in the cognitive network according to the calculation result, and the relay node is used for data transmission among the cognitive user equipment.
And step 3019, discarding data transmission between the cognitive user devices.
And step 3021, sending a notification message to the cognitive user equipment.
The notification message is used for indicating the cognitive user equipment to select the authorized frequency band, the calculated transmission power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network.
Therefore, the spectrum resource allocation method of the embodiment of the invention judges the detection state of the authorized frequency band according to the detection state and the detection probability, when the detection state of the authorized frequency band is busy and the detection probability is less than or equal to the second preset threshold, the detection state of the authorized frequency band is detected again in the second preset detection period, whether the authorized frequency band is the frequency band available for data transmission between the cognitive user equipment is judged, and the spectrum utilization rate is effectively improved; meanwhile, the transmitting power of the cognitive user equipment is reduced, and a proper relay node is selected to assist the cognitive user equipment in service transmission, so that the interruption probability of data transmission between the main user equipment is effectively reduced, the interference between the main user equipment and the cognitive user equipment is effectively reduced, and the throughput rate of the cognitive user equipment is improved.
In an example, the downlink bandwidth of the primary user network is 10MHz in total, and is divided into 5 licensed frequency bands Band _1, Band _2, Band _3, Band _4, and Band _5, and then each licensed frequency Band has 2 MHz. The cognitive user network comprises 5 relay nodes R1、R2、R3、R4And R5. Values of tau and epsilon are set so that the probability of detection PD(τ, ε) ═ 0.8, the probability of false detection 1-PD(τ, ε) 0.2. As shown in FIG. 5, the false alarm probability P is obtained according to the graph of the relationship between the false alarm probability and the false detection probabilityFA(τ,ε)>0.5, then 1-PFA(τ,ε)<0.5。
In a first preset detection period, the source cognitive user equipment STAnd intercepting authorized frequency bands Band _1, Band _2, Band _3, Band _4 and Band _5 in the master user network, sensing the detection states of busy and idle of the authorized frequency bands, and obtaining that the detection states of the authorized frequency bands Band _1, Band _2 and Band _5 are idle and the detection states of Band _3 and Band _4 are busy.
When the detection states of the licensed bands Band _1, Band _2 and Band _5 are "idle", due to 1-PFA(τ,ε)<0.5, destination cognitive user Equipment SRAnd continuously monitoring the detection states of the sensing authorized frequency bands Band _1, Band _2 and Band _5 to obtain that the detection state of Band _1 is idle, the detection state of Band _2 is busy and the detection state of Band _5 is idle.
In summary, STAnd SRBy means of relay node R on authorized frequency Band _12Carrying out data transmission; by means of relay node R on authorized frequency Band _23Carrying out data transmission; by means of relay node R on authorized frequency Band _31Carrying out data transmission; performing direct link transmission on the authorized frequency Band _ 4; by means of relay node R on authorized frequency Band _54And carrying out data transmission.
An embodiment of the present invention provides a spectrum resource allocation apparatus 40 in a cognitive network, as shown in fig. 6, including:
a processing unit 401, configured to obtain, in a first preset detection period, a detection state, a detection probability, and a non-false alarm probability of an authorized frequency band in a master user network;
the processing unit 401 is further configured to:
when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value;
if the non-false alarm probability is larger than a first preset threshold value, selecting a data transmission strategy;
if the non-false alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods;
when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value;
if the detection probability is larger than a second preset threshold value, selecting a data transmission strategy;
if the detection probability is less than or equal to a second preset threshold value, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection time period;
a sending unit 402, configured to send a notification message to a cognitive user device in a cognitive user network, where the notification message is used to instruct the cognitive user device to perform data transmission by using the data transmission policy;
the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
In this way, firstly, in a first preset detection period, the detection state, the detection probability and the non-false alarm probability of the authorized frequency band in the master user network are obtained; then, when the detection state is idle, judging that the non-false-alarm probability is greater than a first preset threshold value, and selecting a data transmission strategy; judging whether the non-false alarm probability is less than or equal to a first preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period; when the detection state is busy, judging that the detection probability is greater than a second preset threshold value, and selecting a data transmission strategy; judging that the detection probability is less than or equal to a second preset threshold value, and selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection period; and then sending a notification message to the cognitive user equipment in the cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy to perform data transmission, so that compared with the prior art, the frequency spectrum utilization rate is effectively improved, and the interference between the master user equipment and the cognitive user equipment is effectively reduced.
It should be noted that the detection states include "busy" and "idle", where the "busy" indicates that there is data transmission on the authorized frequency band, the "idle" indicates that there is no data transmission on the authorized frequency band, the detection probability indicates a probability that the detection state of the authorized frequency band is "busy" and the actual state is "busy", and the non-false alarm probability indicates a probability that the detection state of the authorized frequency band is "idle" and the actual state is "idle".
The processing unit 401 is specifically configured to:
when the non-false alarm probability is greater than the first preset threshold, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a first transmission time period and a first noise power, wherein the first transmission time period is a time period after the first preset detection time period when the cognitive user equipment and the relay nodes perform data transmission, and the first noise power comprises the noise power of the authorized frequency band and does not comprise the noise power of interference of master user equipment to the cognitive user equipment in the master user network;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the non-false alarm probability is less than or equal to the first preset threshold, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a second transmission period and the first noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the detection state of the authorized frequency band is busy in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to the second transmission period and a second noise power, wherein the second noise power comprises the noise power of interference of master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value of interference of the cognitive user equipment to the master user equipment;
and selecting the authorized frequency band, the transmission power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment.
The processing unit 401 is specifically configured to:
when the detection probability is greater than a second preset threshold value, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a first transmission time period and a second noise power, wherein the first transmission time period is a time period for data transmission between the cognitive user equipment and the relay nodes after the first preset detection time period, the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value for interference of the cognitive user equipment to the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
when the detection probability is smaller than or equal to the second preset threshold value, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a second transmission period and the second noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment on the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
and when the detection state of the authorized frequency band is busy in the second preset detection period, discarding the data transmission between the cognitive user equipment.
As shown in fig. 7, in practical applications, the processing unit 401 included in the spectrum resource allocation apparatus 40 in the cognitive network may be the power control and cooperative node selection center 50 to execute the spectrum resource allocation method according to the present invention.
The power control and cooperative node selection center 50 may be specifically divided into a frequency band detection module 51, a calculation module 52, a transmission power adjustment module 53 and a relay node selection module 54. The frequency band detection module may be specifically divided into a frequency band listening unit 511 and a frequency band state decision unit 512; the calculation module may be specifically divided into a detection probability and false alarm probability calculation unit 521, an interruption probability calculation unit 522, and a link throughput calculation unit 523; the transmission power adjustment module may be specifically divided into a high transmission power selection unit 531 and a low transmission power selection unit 532; the relay node selection module may be specifically divided into a service transmission abandoning unit 541, a relay node decision unit 542 and a direct transmission decision unit 543. It should be noted that the specific execution steps of the above modules or units are as described in the present invention, and are not described herein again.
The first preset detection period and the second preset detection period may be equal. The first preset threshold and the second preset threshold may also be equal and may be set to 0.5, which is not limited in the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (6)

1. A method for allocating spectrum resources in a cognitive network is characterized by comprising the following steps:
in a first preset detection period, obtaining a detection state, a detection probability and a non-false-alarm probability of an authorized frequency band in a master user network, wherein the detection state comprises busy and idle, the busy indicates that data transmission exists on the authorized frequency band, the idle indicates that data transmission does not exist on the authorized frequency band, the detection probability indicates that the detection state of the authorized frequency band is busy and the actual state is busy, and the non-false-alarm probability indicates that the detection state of the authorized frequency band is idle and the actual state is idle;
when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value;
if the non-false alarm probability is larger than a first preset threshold value, selecting a data transmission strategy;
if the non-false alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods;
when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value;
if the detection probability is larger than a second preset threshold value, selecting a data transmission strategy;
if the detection probability is less than or equal to a second preset threshold value, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection time period;
sending a notification message to cognitive user equipment in a cognitive user network, wherein the notification message is used for indicating the cognitive user equipment to use the data transmission strategy for data transmission;
the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
2. The method of claim 1, wherein when the detection status is "idle", determining whether the non-false alarm probability is greater than a first preset threshold, and selecting a data transmission policy comprises:
when the non-false alarm probability is greater than the first preset threshold, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a first transmission time period and a first noise power, wherein the first transmission time period is a time period after the first preset detection time period when the cognitive user equipment and the relay nodes perform data transmission, and the first noise power comprises the noise power of the authorized frequency band and does not comprise the noise power of interference of master user equipment to the cognitive user equipment in the master user network;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the non-false alarm probability is less than or equal to the first preset threshold, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a second transmission period and the first noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the detection state of the authorized frequency band is busy in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to the second transmission period and a second noise power, wherein the second noise power comprises the noise power of interference of master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value of interference of the cognitive user equipment to the master user equipment;
and selecting the authorized frequency band, the transmission power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment.
3. The method of claim 1, wherein when the detection status is "busy", determining whether the detection probability is greater than a second preset threshold, and selecting a data transmission policy comprises:
when the detection probability is greater than a second preset threshold value, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a first transmission time period and a second noise power, wherein the first transmission time period is a time period for data transmission between the cognitive user equipment and the relay nodes after the first preset detection time period, the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value for interference of the cognitive user equipment to the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
when the detection probability is smaller than or equal to the second preset threshold value, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a second transmission period and the second noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment on the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
and when the detection state of the authorized frequency band is busy in the second preset detection period, discarding the data transmission between the cognitive user equipment.
4. An apparatus for allocating spectrum resources in a cognitive network, comprising:
the processing unit is used for acquiring the detection state, the detection probability and the non-false alarm probability of an authorized frequency band in a master user network in a first preset detection period, wherein the detection state comprises busy and idle, the busy indicates that data transmission exists in the authorized frequency band, the idle indicates that no data transmission exists in the authorized frequency band, the detection probability indicates that the detection state of the authorized frequency band is busy and the actual state is busy, and the non-false alarm probability indicates that the detection state of the authorized frequency band is idle and the actual state is idle;
the processing unit is further to:
when the detection state is idle, judging whether the non-false-alarm probability is greater than a first preset threshold value;
if the non-false alarm probability is larger than a first preset threshold value, selecting a data transmission strategy;
if the non-false alarm probability is less than or equal to a first preset threshold, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in a second preset detection time period, wherein the second preset detection time period and the first preset detection time period are two continuous preset detection time periods;
when the detection state is busy, judging whether the detection probability is greater than a second preset threshold value;
if the detection probability is larger than a second preset threshold value, selecting a data transmission strategy;
if the detection probability is less than or equal to a second preset threshold value, selecting a data transmission strategy according to the detection state of the authorized frequency band in the master user network acquired in the second preset detection time period;
a sending unit, configured to send a notification message to a cognitive user device in a cognitive user network, where the notification message is used to instruct the cognitive user device to perform data transmission using the data transmission policy;
the data transmission strategy is used for deciding an authorized frequency band used when data transmission is carried out between the cognitive user equipment, the transmitting power of the cognitive user equipment and the relay node meeting conditions.
5. The device for allocating spectrum resources in a cognitive network according to claim 4, wherein the processing unit is specifically configured to:
when the non-false alarm probability is greater than the first preset threshold, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a first transmission time period and a first noise power, wherein the first transmission time period is a time period after the first preset detection time period when the cognitive user equipment and the relay nodes perform data transmission, and the first noise power comprises the noise power of the authorized frequency band and does not comprise the noise power of interference of master user equipment to the cognitive user equipment in the master user network;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the non-false alarm probability is less than or equal to the first preset threshold, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a shannon formula according to a second transmission period and the first noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission;
selecting the authorized frequency band, the maximum transmitting power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, so that data transmission is carried out among the cognitive user equipment;
when the detection state of the authorized frequency band is busy in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to the second transmission period and a second noise power, wherein the second noise power comprises the noise power of interference of master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value of interference of the cognitive user equipment to the master user equipment;
and selecting the authorized frequency band, the transmission power of the cognitive user equipment and the relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment.
6. The device for allocating spectrum resources in a cognitive network according to claim 4, wherein the processing unit is specifically configured to:
when the detection probability is greater than a second preset threshold value, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a first transmission time period and a second noise power, wherein the first transmission time period is a time period for data transmission between the cognitive user equipment and the relay nodes after the first preset detection time period, the second noise power comprises the noise power of interference of the master user equipment to the cognitive user equipment in the master user network and the noise power of the authorized frequency band, calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than the threshold value for interference of the cognitive user equipment to the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
when the detection probability is smaller than or equal to the second preset threshold value, acquiring the detection state of the authorized frequency band in a second preset detection period;
when the detection state of the authorized frequency band is idle in the second preset detection period, calculating the throughput rates of all relay nodes in the cognitive network by adopting a Shannon formula according to a second transmission period and the second noise power, wherein the second transmission period is a period after the second preset detection period when the cognitive user equipment and the relay nodes perform data transmission, and calculating the transmitting power of the cognitive user equipment, and the transmitting power of the cognitive user equipment is smaller than a threshold value of interference of the cognitive user equipment on the master user equipment;
selecting the authorized frequency band, the transmission power of the cognitive user equipment and a relay node with the maximum throughput rate in the cognitive network, wherein the transmission power of the relay node is less than or equal to a threshold value of interference caused by the transmission power of the relay node to the main user equipment, so that data transmission is performed among the cognitive user equipment;
and when the detection state of the authorized frequency band is busy in the second preset detection period, discarding the data transmission between the cognitive user equipment.
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