CN101729164A - Wireless resource allocation method and cognitive radio user equipment - Google Patents

Wireless resource allocation method and cognitive radio user equipment Download PDF

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Publication number
CN101729164A
CN101729164A CN200810225063A CN200810225063A CN101729164A CN 101729164 A CN101729164 A CN 101729164A CN 200810225063 A CN200810225063 A CN 200810225063A CN 200810225063 A CN200810225063 A CN 200810225063A CN 101729164 A CN101729164 A CN 101729164A
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available channel
cognitive radio
user equipment
radio user
transmitting power
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CN101729164B (en
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曾志民
郭彩丽
李琳
刘芳芳
冯春燕
王海光
冯淑兰
刘劲楠
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The embodiment of the invention discloses a wireless source allocation method and cognitive radio user equipment, belonging to the technical field of communication. The method comprises the steps of calculating the utility of each available channel and emitting power for reaching the utility by the cognitive radio user equipment; comparing the utilities of all available channels; and selecting an available channel with maximum utility and the emitting power corresponding to the maximum utility. The user equipment comprises a calculating module, a comparing module and a selecting module. In the embodiment of the invention, the selective frequency spectrum resource and the emitting power are combined to further reduce the co-channel interference between users.

Description

Wireless resource allocation methods and cognitive radio user equipment
Technical field
The present invention relates to wireless communication field, particularly wireless resource allocation methods and cognitive radio user equipment.
Background technology
Along with development of wireless communication devices, people are increasing to the demand of radio spectrum resources.Yet wireless frequency spectrum is rare, Limited resources.How to make full use of frequency spectrum resource, improve the availability of frequency spectrum, become a problem demanding prompt solution.CR (Cognitive radio, cognitive radio) technology is for a kind of feasible scheme that provides is provided.In the CR network, the user (CR user) with cognitive function need detect the authorized user frequency spectrum, utilizes the frequency spectrum resource of having authorized frequency range under the prerequisite that does not influence the authorized user proper communication.
Because CR user depends on authorized user to the utilization of frequency spectrum, and the frequency spectrum of authorized user take situation be in time, the place is fast-changing, so the distributing radio resource that the CR network must can be flexible and efficient.Compare with centralized network, distributed network has reduced the resource allocation time owing to need not the mutual of spectrum information between the user, adapts to fast-changing CR network environment more.
In addition, CR user has intelligent, but the perception surrounding environment and according to environmental change to transmission parameter make intelligence adjustment.May there be multiple user in the real network, cooperation, selfishness or even malice, be necessary to further investigate how to compete Radio Resource in the CR network between the user.The process of the Resources allocation of vying each other between a plurality of CR users can adopt game theoretical model research.Under this model, CR user is the participant, and its decision-making is selected transmission parameter (channel, power etc.) exactly, makes resource allocation decisions by the maximization of pursuing utility function between the user.CR user's decision-making not only can influence the performance of self, also can other users' performance be exerted an influence.
In the prior art, a kind of distributed resource allocation method that joint spectrum distributes and power is controlled based on game theoretical model has been proposed.In the method, the chance that each CR user selects with certain probability acquisition strategy.The user who obtains chance turns to target with the utility function maximum and comes selective channel, has selected channel after, basis satisfies the condition selection CR user's of minimum signal interference ratio transmitting power again.When all CR users' current channel all was the channel of effectiveness maximum, then each user can not change channel, i.e. algorithmic statement again.
In realizing process of the present invention, the inventor finds that above-mentioned prior art has following shortcoming at least:
Though considered power control and spectrum allocation may, but control of user's power and spectrum allocation may are carried out after remaining and having earlier successively, there is not to consider can be real the time factor of two aspects, this has just caused the user for reaching the maximum transmitting power that improves of utility function, and malice is competed the interference between the user who brings each other.
Summary of the invention
In order to reduce the co-channel interference between the CR user, the embodiment of the invention provides a kind of wireless resource allocation methods and cognitive radio user equipment.Described technical scheme is as follows:
A kind of wireless resource allocation method comprises:
Cognitive radio user equipment calculates the effectiveness on each available channel and reaches the transmitting power of described effectiveness;
Effectiveness on more described each available channel;
Choose the available channel of maximum utility and the transmitting power of described maximum utility correspondence.
A kind of cognitive radio user equipment comprises:
Computing module is used to calculate effectiveness and the transmitting power that reaches described effectiveness on each available channel;
Comparison module is used for the effectiveness on more described each available channel;
Choose module, be used to choose the available channel of maximum utility and the transmitting power of described maximum utility correspondence.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
When CR user carries out resource selection, unite selection, can reduce the co-channel interference between the user, improve the average signal interference ratio of system, guarantee certain fairness simultaneously by frequency spectrum resource and transmitting power.
Description of drawings
Fig. 1 is a distributed network topology schematic diagram in the prior art;
Fig. 2 is the wireless resource allocation method flow diagram that the embodiment of the invention one provides;
Fig. 3 is the wireless resource allocation method flow diagram that the embodiment of the invention two provides;
Fig. 4 is the CR user device architecture schematic diagram that the embodiment of the invention three provides;
Fig. 5 is the another kind of CR user device architecture schematic diagram that the embodiment of the invention three provides.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The CR network topology of the embodiment of the invention as shown in Figure 1, N is evenly distributed in the zone of D*D CR subscriber equipment (transmitter-receiver), and M available channel arranged in the network, M＜N wherein, M, N are positive integer, each CR user only takies a channel.The CR subscriber equipment carries out Channel Detection, determines available channel, shared these channel resources of all CR users.
Embodiment one
Referring to Fig. 2, the embodiment of the invention provides a kind of wireless resource allocation method, comprising:
Effectiveness on each available channel of 201:CR subscriber devices compute and the transmitting power that reaches this effectiveness;
According to the interfere information on each available channel, when calculating the effectiveness on each available channel and reaching the transmitting power of this effectiveness.
202: compare the effectiveness on each available channel;
203: choose the available channel of maximum utility and the transmitting power of this maximum utility correspondence, respectively as the available channel and the transmitting power of this CR subscriber equipment.
201 comprise:
A: survey the interfere information on each available channel;
B: calculate transmitting power on each available channel according to interfere information;
C: calculate effectiveness on each available channel according to transmitting power.
Wherein, i is an example with the CR subscriber equipment, and steps A specifically comprises:
CR subscriber equipment i surveys the background noise N of available channel j 0, and other CR subscriber equipment interference on available channel j
Figure G2008102250631D0000031
Wherein, N is the number of CR subscriber equipment, 1≤i≤N, f jExpression available channel j, p k(f j) transmitting power of expression CR subscriber equipment k on available channel j, k ≠ i, 1≤k≤N, G KiLink gain between expression CR subscriber equipment k and the CR subscriber equipment i, p k(f j) G KiRepresent CR subscriber equipment k interference to CR subscriber equipment i on available channel j.
Step B comprises:
According to
Figure G2008102250631D0000032
Calculate the transmitting power of CR subscriber equipment i on available channel j;
Wherein
Figure G2008102250631D0000033
Be described interfere information; p i(f j) transmitting power of expression CR subscriber equipment i on available channel j, G IiThe link gain of expression CR subscriber equipment i self, λ iExpression Power penalty index, λ i=C/d i, C is a constant for all cognitive radio user equipments, d iDistance between the transmitter and receiver of expression CR subscriber equipment i.
Transmitting power p i(f j) span be: P Min≤ P i(f j)≤P Max
P MinFor when not having other users to disturb, make the minimum emissive power of transmitter of CR subscriber equipment i of the receiver normal decoder of CR subscriber equipment i;
P MaxFor the maximum of the transmitter of CR subscriber equipment i allow transmitting power and the maximum transmission power that calculates according to the interference temperature thresholding in minimum value.
Step C comprises:
According to formula
Figure G2008102250631D0000041
Calculate effectiveness;
Wherein, p i(f j) the expression transmitting power; u j(p i(f j), P -i(f j)) effectiveness of expression CR subscriber equipment i on available channel j, P -i(f j) other CR subscriber equipmenies the transmitting power on available channel j of expression except that CR subscriber equipment i, p i(f j) G IiSignal power on the available channel j that expression CR subscriber equipment i receives, λ ip i(f j) the expression cost function.
Described method also comprises:
204: judge whether the available channel of choosing changes; If change, then distribute again.
The embodiment of the invention is found spectrum opportunities and surveys interfere information that autonomous distributing radio resource has taken into full account the competitive relation between the CR user flexibly, adapts to fast-changing CR network environment more by the detection of CR subscriber equipment self; When user's group was carried out resource selection, frequency spectrum resource and transmitting power were united selection, can further reduce the co-channel interference between the user, improved the average signal interference ratio of system, guaranteed certain fairness simultaneously; In addition, by in utility function, adding the relevant cost index of transceiver distance, when guaranteeing certain average signal interference ratio and fairness, significantly reduced the average transmit power of system.
Embodiment two
Referring to Fig. 3, the embodiment of the invention provides a kind of wireless resource allocation methods, comprising:
301:, the CR network is set up game theoretical model G=＜N, A, { u according to the situation of CR network i}＞; Wherein,
1. N is the participant, N CR user;
2. A is a policy space; Wherein mainly comprise two parts:
Channel selection strategy (f 1, f 2, f 3F M), M represents the number of available channel;
Power selection strategy (P Min＜P i(f j)＜P Max), i=1,2,3 ... N; J=1,2,3 ... M;
Wherein, P MinFor when not having other users to disturb, make the minimum emissive power of transmitter of CR subscriber equipment i of the receiver normal decoder of CR subscriber equipment i;
P MaxFor the maximum of the transmitter of CR subscriber equipment i allow transmitting power and the maximum transmission power that calculates according to the interference temperature thresholding in minimum value.
3. { u iIt is utility function;
302:N CR subscriber equipment Initial Channel Assignment distributes and power, wherein can adopt at random channel allocation and firm power.
After the CR network was finished aforesaid operations, each CR subscriber equipment began the wireless resource allocation process:
The 303:CR subscriber equipment is surveyed the interfere information on M the available channel.
Wherein, interfere information comprises background noise and other CR subscriber equipment interference on same available channel on the channel; Concrete, CR subscriber equipment i surveys the background noise N on the available channel j 0With the interference to CR subscriber equipment i on available channel j of other CR subscriber equipmenies
Figure G2008102250631D0000051
Wherein, N is the number of CR subscriber equipment, 1≤i≤N, f jExpression available channel j, p k(f j) transmitting power of expression CR subscriber equipment k on available channel j, k ≠ i, 1≤k≤N, G KiLink gain between expression CR subscriber equipment k and the CR subscriber equipment i, p k(f j) G KiRepresent CR subscriber equipment k interference to CR subscriber equipment i on available channel j.
The 304:CR subscriber equipment is according to the interfere information that detects, the transmitting power of transmitter computes;
Interfere information is expressed as:
Figure G2008102250631D0000052
The computing formula of transmitting power is:
p i ( f j ) = 1 / ( λ i ln 2 ) - ( Σ k ≠ i , k = 1 N p k ( f j ) G ki + N 0 ) / G ii
Wherein, p i(f j) transmitting power of the described user i of expression on available channel j, G IiThe link gain of expression CR subscriber equipment i self, λ iExpression Power penalty index, λ i=C/d i, C is a constant for all cognitive radio user equipments, d iDistance between the transmitter and receiver of expression CR subscriber equipment i.
Work as p i(f j) result of calculation greater than P MaxThe time, p i(f j)=P Max
Wherein, P MaxValue be the maximum of the transmitter of CR subscriber equipment allow transmitting power (hardware constraints or energy constraint) and these two values of maximum transmission power of calculating according to the interference temperature thresholding in minimum value.
Work as p i(f j) result of calculation less than P MinThe time, p i(f j)=P Min
Wherein, P MinValue be not have under the situation that other CR subscriber equipmenies disturb, make the minimum emissive power of the transmitter of the CR subscriber equipment that the receiver of CR subscriber equipment can normal decoder.
305:, calculate the effectiveness on the respective channels according to transmitting power;
The computing formula of effectiveness is:
u j ( p i ( f j ) , p - i ( f j ) ) = log 2 ( 1 + p i ( f j ) G ii Σ k ≠ i , k = 1 N p k ( f j ) G ki + N 0 ) - λ i p i ( f j )
Wherein, p i(f j) the expression transmitting power; u j(p i(f j), p -i(f j)) effectiveness of expression CR subscriber equipment i on available channel j, p -i(f j) other CR subscriber equipmenies the transmitting power on available channel j of expression except that CR subscriber equipment i, p i(f j) G IiTransmitting power on the available channel j that expression CR subscriber equipment i receives, λ ip i(f j) the expression cost function.
The 306:CR subscriber equipment is chosen the channel of maximum utility relatively from the effectiveness in each channel;
Maximum utility can be expressed as:
U i ( p i ( f j ) , p - i ( f j ) ) = max j { u j ( p i ( f j ) , p - i ( f j ) ) } , j = = 1,2,3 · · · · · · M
If u sMaximum, then CR subscriber equipment i selective channel s and transmitting power p i(f s).
Each CR equipment carries out the selection of channel and transmitting power according to above-mentioned 303 to 305 step, and the CR subscriber equipment in the CR network is all finished resource allocation.
307: judge to distribute whether restrain, if convergence, then resource allocation finishes; If do not restrain, then repeat 302 to 306.The essential condition of judging convergence is whether the channel of judging all CR user equipment allocation changes, and promptly whether reaches Nash Equilibrium (Nash Equilibrium).
The embodiment of the invention is found spectrum opportunities and surveys interfere information that by CR user's self detection autonomous distributing radio resource has taken into full account the competitive relation between the CR user flexibly, adapts to fast-changing CR network environment more; When user's group was carried out resource selection, frequency spectrum resource and transmitting power were united selection, can further reduce the co-channel interference between the user, improved the average signal interference ratio of system, guaranteed certain fairness simultaneously; In addition, by in utility function, adding the relevant cost index of transceiver distance, when guaranteeing certain average signal interference ratio and fairness, significantly reduced the average transmit power of system.
Embodiment three
Referring to Fig. 4, the embodiment of the invention provides a kind of cognitive radio user equipment, comprising:
Computing module 401 is used to calculate effectiveness and the transmitting power that reaches this effectiveness on each available channel;
Comparison module 402 is used for the effectiveness on each available channel of comparison;
Choose module 403, be used to choose the available channel of maximum utility and the transmitting power of this maximum utility correspondence.
Wherein, described computing module 401 can comprise:
Interfere information obtains module, is used to obtain the interfere information on each available channel;
Transmitting power obtains module, is used for calculating transmitting power on each available channel according to interfere information;
Effectiveness obtains module, is used for calculating effectiveness on each available channel according to transmitting power.
Further, referring to Fig. 5, cognitive radio user equipment also comprises:
Judge module 404 is used to judge whether the available channel of choosing changes;
If change, then distribute again.
The embodiment of the invention is found spectrum opportunities and surveys interfere information that by CR user's self detection autonomous distributing radio resource has taken into full account the competitive relation between the CR user flexibly, adapts to fast-changing CR network environment more; When user's group was carried out resource selection, frequency spectrum resource and transmitting power were united selection, can further reduce the co-channel interference between the user, improved the average signal interference ratio of system, guaranteed certain fairness simultaneously; In addition, by in utility function, adding the relevant cost index of transceiver distance, when guaranteeing certain average signal interference ratio and fairness, significantly reduced the average transmit power of system.
The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of router, buffer memory or the CD.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a wireless resource allocation method is characterized in that, comprising:
Cognitive radio user equipment calculates the effectiveness on each available channel and reaches the transmitting power of described effectiveness;
Effectiveness on more described each available channel;
Choose the available channel of maximum utility and the transmitting power of described maximum utility correspondence.
2. wireless resource allocation method as claimed in claim 1 is characterized in that, the effectiveness on more described each available channel comprises:
Survey the interfere information on each available channel;
According to the transmitting power on described each available channel of described interfere information calculating;
According to the effectiveness on described each available channel of described transmitting power calculating.
3. wireless resource allocation method as claimed in claim 2 is characterized in that, described cognitive radio user equipment is cognitive radio user equipment i, and the interfere information on each available channel of described detection comprises:
Described cognitive radio user equipment i surveys the background noise N of available channel j 0, and the interference of other cognitive radio user equipments on described available channel j
Wherein, N is the number of cognitive radio user equipment, 1≤i≤N, f jRepresent described available channel j, p k(f j) transmitting power of expression cognitive radio user equipment k on described available channel j, k ≠ i, 1≤k≤N, G KiRepresent the link gain between described cognitive radio user equipment k and the described cognitive radio user equipment i, p k(f j) G KiRepresent described cognitive radio user equipment k interference to described cognitive radio user equipment i on described available channel i.
4. wireless resource allocation method as claimed in claim 3 is characterized in that, and is described according to the transmitting power on described each available channel of described interfere information calculating, comprising:
According to
Figure F2008102250631C0000012
Calculate the transmitting power of described cognitive radio user equipment i on described available channel j;
Wherein
Figure F2008102250631C0000013
Be described interfere information; p i(f j) transmitting power of the described cognitive radio user equipment i of expression on described available channel j, G IiThe link gain of representing described cognitive radio user equipment i self, λ iExpression Power penalty index, λ i=C/d i, C is a constant for all cognitive radio user equipments, d iRepresent the distance between the transmitter and receiver of described cognitive radio user equipment i.
5. wireless resource allocation method as claimed in claim 4 is characterized in that, described transmitting power p i(f j) span be: P Min≤ p i(f j)≤P Max
Described P MinFor when not having other cognitive radio users to disturb, make the minimum emissive power of transmitter of described cognitive radio user equipment i of the receiver normal decoder of described cognitive radio user equipment i;
Described P MaxFor the maximum of the transmitter of described cognitive radio user equipment i allow transmitting power and the maximum transmission power that calculates according to the interference temperature thresholding in minimum value.
6. as wireless resource allocation method as described in the claim 4, it is characterized in that, describedly calculate effectiveness on described each available channel, comprising according to described transmitting power:
According to formula
Figure F2008102250631C0000021
Calculate described effectiveness;
Wherein, p i(f j) represent described transmitting power; u j(p i(f j), p -i(f j)) effectiveness of the described cognitive radio user equipment i of expression on described available channel j, p -i(f j) other cognitive radio user equipments the transmitting power on described available channel j of expression except that cognitive radio user equipment i, p i(f j) G IiRepresent the transmitting power on the available channel j that described cognitive radio user equipment i receives, λ ip i(f j) the expression cost function.
7. wireless resource allocation method as claimed in claim 1 is characterized in that, described choose the available channel of described effectiveness maximum and reach the transmitting power of described effectiveness maximum after, described method also comprises:
Judge whether the described available channel of choosing changes;
If change, then distribute again.
8. a cognitive radio user equipment is characterized in that, comprising:
Computing module is used to calculate effectiveness and the transmitting power that reaches described effectiveness on each available channel;
Comparison module is used for the effectiveness on more described each available channel;
Choose module, be used to choose the available channel of maximum utility and the transmitting power of described maximum utility correspondence.
9. cognitive radio user equipment as claimed in claim 8 is characterized in that, also comprises:
Judge module is used to judge whether the described available channel of choosing changes;
If change, then distribute again.
10. cognitive radio user equipment as claimed in claim 8 or 9 is characterized in that described computing module comprises:
Interfere information obtains module, is used to obtain the interfere information on each available channel;
Transmitting power obtains module, is used for calculating transmitting power on each available channel according to interfere information;
Effectiveness obtains module, is used for calculating effectiveness on each available channel according to transmitting power.
CN2008102250631A 2008-10-27 2008-10-27 Wireless resource allocation method and cognitive radio user equipment Expired - Fee Related CN101729164B (en)

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