80 results about "Cognitive base station" patented technology

The present application relates to of the communication field and discloses a method, device and system for implementing frequency point shift based on CR. The method comprises: determining, by a cognitive base station, a candidate working frequency point for UE deployed in a cognitive frequency band; then sending to the UE broadcast information which at least carries the candidate working frequency point and instructing the UE to shift from the working frequency point currently used thereby to the candidate working frequency point by way of a frequency point shift command. In this way, the UE deployed in the cognitive frequency band can achieve frequency point shift quickly and accurately according to the instruction from the cognitive base station when an authorized user accesses the working frequency point currently used by the UE, effectively avoiding interference to the authorized user and thereby ensuring the service performance and service continuity of the system. The present application also discloses a corresponding device and system.

The invention provides a cross-layer cognitive radio network user access method based on frequency hopping, and belongs to the field of application of radio networks. According to the method, cognitive users in primary user network is divided into a plurality of clusters according to the cognitive base station service range; each cluster comprises a cognitive base station (cluster head) and a plurality of cognitive users (cluster nodes); the cognitive base station is connected with a primary user base station and is managed by the user base station; however, the communications of cognitive users are controlled and managed by the cognitive base station. Based on the fact that corresponding idle spectrum information is obtained through monitoring a primary user on the network physical layer and sensing the spectrum, a plurality of frequency hopping patterns are generated by using a frequency hopping technology, and the cognitive users are made to carry out hopping communications between a plurality of signal channels as per certain frequency hopping pattern within different frequency ranges at different time on the MAC (Media Access Control) layer, so that the cognitive user dynamic access is achieved. The invention has the excellent effects of small network expense, high utilization ratio of spectrum, small interference and flexible and efficient user access manner.

The invention applies for protecting a double coordination detection method for vacant frequency spectrum detection in a cognitive radio system, relating to a radio communication system. The method is as follows: a plurality of cognitive users which take part in coordination in a traditional coordination detection algorithm are partitioned into different groups; a cognitive user needing communication is a group leader of the group; then the purposes of reducing spending of a control channel and improving detection performance of a system are gained by coordination within groups and coordination between groups. The users within the group locally judge by using an energy-check algorithm whether a master user signal exists in a certain frequency band authorized to the master user and transmits a local judgment result to the group leader. The group leader syncretizes the local judgments to make a group judgment result. A cognitive base station further syncretizes the group judgment resultto make judgment, thus getting the final judgment of the system. Bit numbers of the judgment result transmitted to the cognitive base station are largely reduced by using the method, thus greatly saving bandwidth of the control channel, and detection performance is increased.

The invention relates to a cognitive radio system based on relay cooperation transmission and a resource allocation method thereof. The system comprises a cognitive base station and a plurality of cognitive terminals, wherein the cognitive base station comprises a base station environment cognitive module, a cognitive information library, a wireless resource allocation module and a base station reconfiguration management module; and the cognitive terminal comprises a business state module, a terminal environment cognitive module and a terminal reconfiguration management. The system and the method of the invention takes satisfaction of QoS demands from users and maximization of effective throughput of the system as targets, further has practical meaning, and meets experience requirements of the users. The policies on relay and transmission path selection, frequency spectrum allocation, transmission rate control and other wireless resource allocation are determined based on various useful cognitive information of the system, thereby solving the problem of the wireless resource allocation in the cognitive radio system based on the relay cooperation transmission, optimizing system performance and improving utilization rate of system frequency spectrum.

The invention provides a band dynamic selecting and time scheduling method in a heterogeneous network, relating to a method and equipment for dynamically selecting usable frequency resources in a plurality of main system bands in a heterogeneous network system based on the cognitive technology, in particular to a method and equipment used for opportunity spectrum access, frequency resource efficient utilization, and combination of heterogeneous network resource amalgamation and user business service quality (QoS) assurance. The invention has the band dynamic selecting method as follows: firstly, aiming to different main system characteristics, an average main system user detection threshold of each main system of a base station CBS accessory is defined and cognized, and the threshold is an average value of the prior detection threshold in a wireless network transmission environment; secondly, according to the average main system user detection threshold and the throughput needs of a secondary system user, scanning efficient time of CBS to each main system is defined; thirdly, the CBS selects the optimal main system band from a usable band list according to a request of a user, the wireless transmission characteristics and a channel state of a band channel are the basis for selecting the optimal band, and interruption of the equipment CPE transmission throughput is preset according to the user.

The invention relates to the field of communication and discloses a method, a device and a system for realizing cell switch based on CR (Cognitive Radio). In the method, when the access of an authorized user to a working frequency point of a current cell is determined, a target working frequency point determined according to a frequency spectrum detection result is transmitted to UE (User Equipment) resided in the current cell by a cognitive base station through an RRC (Radio Resource Controller) connection reconfiguration message, so that the UE can quickly and accurately exit from the current cell and is switched to a target cell using the target working frequency point, further the interference of the UE on the authorized user is avoided, the service continuousness of the system is ensured, the performance indication requirement of a mobile communication system during adoption of a CR technology is met and the service quality of the system is improved. The invention also discloses the corresponding device and the corresponding system.

The invention relates to a game type selection-based method for realizing dynamic spectrum allocation. With the development of the wireless communication technology, the traditional fixed spectrum allocation mode which leads to the waste of resources and has low spectrum utilization rate, has become the key factor of limiting the further development of the wireless communication network. The cognitive radio-based dynamic spectrum allocation technology is considered as a key technology for effectively solving the problem. In the method of the invention, by comparing the perfect dynamic game with the return of Nash Bargaining, the cognitive base station and the secondary user can separately choose an optimal strategy flexibly and fairly, namely an optimal spectrum quoted unit price and a spectrum purchase quantity. Meanwhile, in order to realize the selection operations of the both sides, a simple spectrum access procedure is designed to be compatible with the traditional mobile call access procedure. By adopting the invention, the returns of the cognitive base station and the secondary user can be effectively increased and the spectrum utilization can be promoted.

The invention provides a solving method which coordinates a cognitive radio system to enhance robustness detection. The method for detecting a frequency spectrum hole in cognitive radio mainly comprises the following steps: independently sampling a frequency spectrum environment which needs to be detected by a plurality of cognitive users of a cognitive system in different geographical positions so as to obtain perceptive signals; sending perceptive data obtained by means of sampling by the cognitive user through a control channel in the cognitive system to a cognitive based station; receiving a plurality of perceptive signals and splitting the perceptive signals into a plurality of shorter perceptive signal sections with identical slot time by the cognitive based station, and obtaining a perceptive signal matrix through data infusion; and calculating the perceptive signal matrix and a covariance matrix, maximum and minimum eigenvalues of the covariance matrix and eigenratio of the maximum eigenvalues and minimum eigenvalues, comparing the eigenratio with a decision threshold, and judging whether the frequency spectrum hole exists or not. The method for detecting the frequency spectrum hole in the cognitive radio can effectively improve systematic detecting performance under the condition that the number of cooperative users are less.

The invention discloses a channel and power joint distribution method for guaranteeing communication continuity in cognitive radio. The method includes that S1, a cognitive user periodically perceives radio environment, and a cognitive base station obtains sub-channel state information; S2, a cognitive user sends a communication request to the cognitive base station and informs the cognitive base station of amount of information required to be transmitted, and simultaneously the cognitive base station acquires service quality demand information of the cognitive user; S3, the cognitive base station distributes optimum channel and power of an initial phase for the cognitive user through solving an optimization problem, and the cognitive user starts to communicate; S4, when the communication of the initial phase is finished, the sub-channel state information and the service quality demand information are updated; S5, the cognitive base station performs the optimal joint distribution of channel and power of i phase; and S6, the cognitive user continues to periodically perceiving surrounding radio environment, and the optimal distribution of the channel and power of subsequent phases is achieved. The method can guarantee the communication continuity of the cognitive user at different resource distribution phases.

The invention provides a cognitive wireless communication system for an electric system, and a MAC protocol realization method for the electric system. The system includes a main base station, a cognitive base station, a spectrum negotiation terminal, an authorized user and a cognitive user; the main base station and the cognitive base station respectively manages the authorized user and the cognitive user; the main base station and the cognitive base station carry out information interaction; and the cognitive base station and the spectrum negotiation terminal carry out the information interaction. The MAC protocol realization method provides a more scientific spectrum resource allocation method on basis of urgency and fairness based, and also a multi-parameter frequency switching method on basis of a weighting. The cognitive wireless communication system of the invention reduces the spectrum sensing time and improves the sensing efficiency, so that the radio frequency utilization efficiency is increased; the communication anti-interference capacity of the electric wireless terminal is improved; the more scientific spectrum resource allocation is realized; the rational resource sharing is ensured; the more comprehensive and integrated frequency switching is achieved; the smooth transition of switching is ensured; and the switching performance impact is reduced.

The invention relates to a cognitive SIMO network access method based on cooperative relay, wherein a cognitive base station collects channel responses in a network and judges whether the cognitive users can cooperate with a primary user to achieve the target transmission rate required by the primary user or not, if so, a cognitive SIMO network is accessible to a frequency band licensed to the primary user; otherwise, the cognitive SIMO network is non-accessible. The access method can enable a plurality of the cognitive users and the primary user to simultaneously use the same licensed spectrum in the same geographical position, on the premise of ensuring the target transmission rate of the primary user, and further improve the utilization efficiency of the spectrum as far as possible. As the access method is based on cooperative communication, the nearer the distance from the cognitive network to the primary network is, the greater the network throughput can be achieved; and furthermore, a large-range network coverage can be realized, so the deficiencies in the existing cognitive radio access ways are made up.

The invention discloses an optimal resource distribution method for a cooperative transmission energy collection cognitive radio network, solving the problem that an existing cognitive radio resource distribution strategy cannot meet energy collection requirements and cannot ensure fairness between secondary users. The method comprises the implementation steps of setting a target parameter; initializing a secondary user parameter; performing iterative computation on the secondary user parameter; judging an iteration condition of secondary user perception time; acquiring the best secondary user parameter; and completing the optimal resource distribution of the cooperative transmission energy collection cognitive radio network. According to the method provided by the invention, channel distribution with maximal fairness, the optimal perception time and the optimal power distribution can be rapidly acquired in the case of ensuring the minimal energy collection requirement of an energy collector and providing better fairness for the secondary user; the energy collector is used for collecting energy of radio frequency signals sent by a cognitive base station, the energy is recycled, and utilization efficiency is improved; the method provided by the invention is low in computation complexity, and has a prospect of engineering application.

The invention discloses a dynamic cognitive network resource allocating method, and belongs to the technical field of wireless communication. The occupied situation of a master user authorization frequency band is predicted based on master user historical information and service characteristics, a cognitive base station carries out subordinate user frequency spectrum and power joint optimization allocation according to the frequency spectrum prediction information and subordinate user service requirement information, and therefore maximization of the subordinate user joint energy efficiency and minimization of the number of switching times are achieved. According to the method, the occupied state of the cognitive network master user frequency band, the subordinate user service requirement and switching cost caused by frequency band switching are comprehensively taken into consideration, the joint resource allocation is carried out based on a network energy efficiency maximization criterion, and the subordinate user joint energy optimization is achieved while the subordinate user service requirement is guaranteed and the performance drop caused by switching is reduced.

The invention belongs to the field of water area monitoring, in particular to a multi-base station type water area monitoring control system and a monitoring control method thereof. The multi-base station type water area monitoring control system comprises a multi-base station target data fusion system, an electronic chart system, a ship control system, a video monitoring system, a video transferservice system, an AIS base station and a water area multiple joint cognitive base station; the multi-base station target data fusion system firstly fuses multiple paths of radar target data to obtaina path of radar target data, and fuses a path of radar target data with AIS data to obtain track target data, thereby greatly reducing the negative influence caused by sea clutter and improving the target measurement precision. If the optoelectronic device cannot perform accurate evidence extraction, an unmanned aerial vehicle is called to perform onsite snapshot evidence extraction, so that theship management reliability is greatly improved.

The invention discloses a robust wave beam forming method in a multi-antenna multi-user relay cognitive radio network, relating to the technical field of wireless communication. Aiming at the condition that the cognitive radio network channel information has uncertainty, a robust linear wave beam forming method of a cognitive base station and a cognitive relay is designed, interference from or to a main user is suppressed and eliminated, and maximization of weighting rate of a plurality of receiving end users in the cognitive radio network under the most severe condition of the channel is ensured. The invention has the advantages and the characteristics that aiming at a relay-based multi-user multi-antenna complex cognitive communication network that has uncertainty of channel information, the method can be used for effectively simplifying the complex problem needing being solved into a problem capable of being rapidly calculated, therefore, a wave beam forming parameter is rapidly designed, and optimal communication is realized by the relay-based multi-user multi-antenna cognitive radio network under the condition that channel information is incompletely known.

The invention provides a beam-forming-based power distribution method for restraining interference between a cognitive base station and a master user and improving the performance of a cognitive system at the cognitive environment. The method comprises the steps that a plurality of antennas are respectively used at the cognitive base station side and cognitive user sides; according to the channel environment of the system, the beam forming technology is adopted at the cognitive base station side and the cognitive user sides for distributing transmitting power to the multiple cognitive users. In the power distributing process, the interference between the cognitive system and a main system and the performance indexes of the cognitive system and the main system are taken into consideration at the same time, and the optimization theory is used for modeling beam forming and power distribution problems of the cognitive system to be a multiobjective optimization problem. In the optimal solution solving process, beam forming and power distribution are achieved through an iterative method based on the fixed variate thought. The beam-forming-based power distribution method has the advantages of being low in complexity, high in rate of convergence and the like, and has the certain application value in the actual use process.

The invention discloses a power grid supply and demand adjustment method based on synergy of a power grid and a base station. The power grid supply and demand adjustment method based on the synergy of the power grid and the base station includes steps: using an energy supply and demand ratio as a main parameter of interaction between an energy supply main body and the base station in a smart power grid, setting the maximum energy efficiency ratio as a target, building a cognition base station component channel and a power optimization allocation model of a base station down link OFDM system, obtaining an allocation plan of communication base station resources by performing stepping solutions on the cognition base station component channel and the power optimization allocation model, maximizing a ratio of the quantity of information emitted by the base station to the quantity of information consumed by the base station, guaranteeing supply and demand transient equilibrium of power energy, and maintaining stabilization of the power grid. The power grid supply and demand adjustment method based on the synergy of the power grid and the base station introduces the energy supply and demand ratio into the cognition base station component channel and the power optimization allocation model, and can guarantee the supply and demand transient equilibrium of the power energy and maintain the stabilization of the power grid on the premise of reasonably allocating and efficiently using electric power resources provided by the smart power grid.

The invention discloses a cognitive communication physical layer secure energy efficiency optimization method based on artificial noises. A cognitive base station carries out joint design of secret signals and the artificial noises according to channel state information between the cognitive base station and a cognitive user; and through optimization of power allocation of the secret signals and the artificial noises, on the basis of ensuring a secure transmission rate, the secure transmission energy efficiency of a cognitive network is maximized. According to the method, a double-layer optimization algorithm is designed; an external layer optimization problem is solved through one-dimensional search; an internal layer optimization problem is solved through converting a fractional form into a subtractive form; and compared with a traditional average power allocation scheme, the method has the advantage of clearly improving the energy efficiency of a cognitive communication system.

The invention discloses a proportional fairness resource distribution method of a cognition OFDM system based on spectrum lining. The proportional fairness resource distribution method of the cognition OFDM system based on spectrum lining comprises the steps that a cognition base station obtains channel state information needed by resource distribution; the cognition base station carries out proportional fairness resource distribution on the frequency and power resources through a firefly method; the cognition base station initializes the parameters of the firefly method and determines the target function value of fireflies; the relative brightness and attractiveness of the fireflies in a group are determined, and the firefly position where the target function value is the maximum is determined; the spatial position vector of the fireflies is updated; whether the newly generated firefly position meets the limitation conditions is detected, if yes, the next step is carried out, and if not, the last step is carried out again; the detection is repeated and the optimal solution of frequency and power resource distribution is output; the cognition base station informs a cognition user of the resource distribution result. The proportional fairness resource distribution method of the cognition OFDM system based on spectrum lining distributes the resources from the two dimensions of frequency and power according to the proportional fairness principle, and provides technical support for efficiently using wireless resources and improving throughput.

The invention relates to a resource distribution method for throughput maximization in a cooperative cognitive SIMO network. The primary user sends data after receiving a cooperation confirmation message, and the cognitive network keeps silence, receives the information data of the primary user and simultaneously decodes the data. The cognitive users which successfully decode the data utilize part of their transmission power to send the data of themselves to the cognitive base station, the remaining transmission power is used for helping in forwarding the data of the primary user; the cognitive users which cannot successfully decode the data only send the data of themselves and do not forward the data of the primary user. The cognitive base station eliminates the interference of the data of primary user in the received mixed signals and performs beamforming on the signals after eliminating the interference. According to the combined adjustment of the transmission power vector, the power distribution factor vector and the beamforming weight vectors of the cognitive SIMO network, the maximum throughput performance can be realized in the cognitive network while the target transmission rate of the primary user is ensured, furthermore, very fast convergence rate can be realized in the proposed resource distribution method.

A cognitive terminal includes different types of radio modules suiting to different types radio media employed by a cognitive base station in the radio communication system. The radio module of the cognitive terminal counts the number of times it receives / transmits ACK / NACK in each unit time. A radio environment cognition unit of the cognitive terminal performs calculations using the count number(s) in consideration of the packet transmission time interval or the time required for repeating a single data packet, thus measuring characteristics of delay time variations in uplink / downlink communication with respect to each radio media. Thus, it is possible for the cognitive terminal to switch over radio media based on ACK / NACK in uplink / downlink communication.

The invention provides a multi-user admission control method used in an uplink of a cognitive radio communication system. The method comprises the following steps that: a cognitive base station receives an access request message from one or more cognitive users; the cognitive base station acquires frequency range information from available frequency range and user information of an authorized user using the authorized frequency range, wherein the user information at least comprises pilot frequency information of the authorized user; the cognitive base station transmits the acquired frequency range information and the user information of the authorized user to the one or more cognitive users; and based on interference channel gain reported by the one or more cognitive users and a channel fading characteristic in the authorized frequency range, the cognitive base station performs admission control on the one or more cognitive users. In addition, the cognitive base station performs power distribution on the cognitive users subjected to admission control, so that the cognitive users can efficiently use the authorized frequency range for communication without influence on the normal communication of the authorized user.

The present invention relates to a spectrum switching method based on a reputation system in a cognitive heterogeneous wireless network. For the problem that selfish or malicious behaviors of secondary users in a spectrum switching process cause degradation of network performance, firstly, the behavior of a secondary user after accessing a channel is evaluated by extracting user behavior characteristic information, a reputation value is determined according to the behavior of the secondary user, and a reputation system is established on a cognitive base station; secondly, the secondary user isranked according to a reputation status of the secondary user, and a licensed channel or a channel of an ISM frequency band is allocated to the secondary user according to the ranking situation of the secondary user; and finally, in a process of accessing a licensed spectrum, when a requirement for a waiting delay of a user is met, the secondary user with a high reputation value has a higher access priority. A simulation result shows that the method can effectively improve system throughput, reduce probability of switching and interruption, reduce the chances to access the licensed spectrum by secondary users with low reputation, and improve system security.

The invention discloses a self-adaptive method for multi-channel assignment in a cognitive radio network. The method mainly solves the problem that an existing method for channel assignment in the cognitive radio network cannot meet the requirement of cognitive users for large bandwidth. The method includes the specific steps that first, a cognitive base station initializes channels assigned to the cognitive users and senses channels occupied by authorized users; second, the cognitive users send user state information and channel gain information to the cognitive base station according to the geographical positions and the bandwidth requirements of the cognitive users and the interference to each authorized user; third, the cognitive base station assigns the channels after receiving the information sent by the cognitive users; fourth, after the assignment is finished, the cognitive base station broadcasts channel assignment information to every cognitive user. Through the method, the requirement of users for large bandwidth can be met, unnecessary bandwidth waste can be avoided, and while the spectral efficiency is improved, it is guaranteed that the channel assigned to each user has high channel quality. The method can be used for assigning channels to cognitive users with disperse geographical positions in the cognitive radio network.

The invention relates to a frequency allocation method of an electric power cognitive wireless network. The electric power cognitive wireless network includes an electric power cognitive base station, electric power cognitive nodes and a cognitive coordination center, the power allocation method is realized directed at the electric power cognitive base station and the electric power cognitive nodes and based on fairness and frequency utilization rate. Frequency resources available to the electric power cognitive wireless network come from idle frequency resources of one or more networks of an electric power McWiLL communication network, an electric power WiMax communication network, an electric power 230MHz private network and public free ISM frequency bands. The method not only considers access fairness of the cognitive nodes under electric power application conditions, but also provides an allocation algorithm with a high frequency utilization rate, thereby satisfying a requirement for access of more nodes, and realizing efficient utilization on the basis of frequency resource allocation fairness.

The invention relates to a spectrum sharing using cognitive radios. Base stations and mobile devices have limited radio frequency spectrum through which they may communicate. Moreover, this spectrum is usually owned by a party having proprietary control. In order to allow for spectrum sharing, cognitive base stations (CBS) may be configured to select a radio frequency channel owned by another entity for its own use, and to determine how much additional noise it will create for such other entity. Based on this determination, the additional noise may be monetized, so that spectrum owners may becompensated for the additional noise created by use of their radio frequency channel.

The invention discloses a low-power-loss multi-channel spectrum sensing method and system facing a cellular communication network. The method comprises the steps that first, a channel management entity selects a shared spectrum which is divided into a plurality of channels; second, the channel management entity divides the channels into a plurality of channel clusters in a frequency domain, during spectrum sensing, an asynchronization silent period is used for channels in different channel clusters, a synchronization silent period is used for channels in the same channel cluster; third, during the silent period, a cognition user terminal completes corresponding spectrum sensing operation in a current cell according to control of a cognitive base station, sensing results are reported to the cognitive base station, the cognitive base station integrates the sensing results and reports the sensing results to the channel management entity; fourth, the channel management entity refreshes state information of all of the current channels in each cell according to the integrated sensing results and feeds the information back to the base station. The frequency of spectrum sensing by the system is reduced, and accordingly power loss is lowered.

The invention relates to a resource allocation algorithm in LTE-R based on recognition. The algorithm comprises the following steps: step one, providing a novel multi-purpose state action set form a dual-target optimization problem of throughput and resource block switching frequency in the LTE-R; step two, providing an exploratory method for a second exploration and utilization balance problem, wherein the performance of the cognitive base station for balancing the exploration and the utilization is better in the process of comparing with a greedy decision method, thereby proving the necessity of environment exploration in the LTE-R cognitive wireless network; and step three, introducing the specific application scene of the embodiment of the invention, discovering that two values in thealgorithm of the invention have respective emphasis on influencing different optimization targets, finding a group of appropriate values, thereby enabling the performance of the system to be more excellent in comparison with other values. Furthermore, the application scene further proves the effectiveness of performing spectrum management in the base station of the LTE-R environment.

The invention discloses a multi-user cognitive MIMO (Multiple-Input Multiple-Output) system concurrent transmission and user scheduling method based on IAC (interactive application communication). The method comprises the following steps that: (1) an authorized user and an authorized base station obtain channel information H0, cognitive users obtain channel information H0, Hi and H<s>i, and a cognitive base station obtains all channel information; (2) the authorized user, the authorized base station, the cognitive users and the cognitive base station respectively implement singular value decomposition on the H0; (3) all the cognitive users respectively calculate an intermediate matrix norm value, and the cognitive user with the maximum value is selected to be scheduled; (4) the cognitive base station gives notice to the scheduled cognitive user SUxi, and the authorized user and the cognitive user SUxi respectively construct a precoding matrix P0 and a precoding vector pxi; (5) data of the authorized user and the activated cognitive user are respectively pre-treated by P0 and pxi and then are sent to a base station; (6) the authorized base station solves a primary data stream x01 of the authorized user and sends the primary data stream x01 to the cognitive base station; (7) filter waves are received by utilizing F<H>, x01 is removed from a received mixed signal, a secondary data stream x02 of the authorized user and a data stream x(xi) of the cognitive user are respectively solved, and x02 is sent to the authorized base station.

The invention discloses a cognitive system frequency spectrum sharing method on the basis of space signal processing, which can be used for a cognitive radio system. The cognitive system frequency spectrum sharing method specifically comprises the following process that: firstly, transceiving ends of the cognitive system respectively acquire required channel information and construct different matrixes to carry out spacial related degree calculation of the transceiving ends after preprocessing the channel information; then according to the spacial related degrees calculated at the transceiving ends, a CBS (cognitive base station) combines the transmission gain to calculate an airspace resource quality factor; and finally, the CBS completes combined selection of an authorize channel and a characteristic mode according to an airspace resource quality factor calculating result, and after the result is notified to a cognitive user, the transceiving ends carry out combined signal processing, so that the simultaneous and same-frequency coexistence of the cognitive system and an authorization system is realized. The method disclosed by the invention has the advantages that all the transceiving ends participate in making a decision and the combined selection of the authorize channel and the characteristic mode is considered. The method has a more reasonable design. The cognitive communication performance is obviously improved.