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1301 results about "Cognitive radio" patented technology
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A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best wireless channels in its vicinity to avoid user interference and congestion. Such a radio automatically detects available channels in wireless spectrum, then accordingly changes its transmission or reception parameters to allow more concurrent wireless communications in a given spectrum band at one location. This process is a form of dynamic spectrum management.
Method for database driven channel quality estimation in a cognitive radio network
ActiveUS20100330919A1Power managementTransmission monitoringCo-channel interferenceGeolocation database
A method of determining operating parameters for a secondary system transmitter is described. The transmitter characteristics, including location and operating frequency band, are provided to a geo-location database. The database determines the maximum allowable transmission power that meets various specifications for different channels and conveys the power and channel(s) to the transmitter. The database estimates channel incumbent signal strengths based on the transmitter location and primary and higher-priority secondary incumbent systems, estimates the splatter levels, determines whether adjacent and co-channel interference protection ratios are met, and adjusts the allowable power level accordingly. The database also estimates aggregate co- and adjacent channel primary and secondary incumbent system interference levels at the transmitter location and predicts channel quality for each allowable channel. The estimated levels are updated using measurements of actual levels at the transmitter location. The database dynamically allocates channels using the secondary system priorities.
Owner:MOTOROLA SOLUTIONS INC +1
Dynamic allocation of spectrum sensing resources in cognitive radio networks
ActiveUS20090247201A1Satisfies requirementFulfil requirementsNetwork traffic/resource managementTransmission monitoringInformation processingFrequency spectrum
A method, wireless controller, and information processing system are provided to dynamically allocate spectrum sensing resources. A first input (804) including available sensing session time for performing spectrum sensing with respect to one or more primary systems (102) is received. A second input (806) including a set of communication channels to be monitored in the spectrum sensing session is received. A third input (808) including detection constraints associated with a plurality of available sensing nodes (114) in a secondary network (104) for performing the spectrum sensing is received. Spectrum sensing resources are dynamically allocated (814) among a set of the plurality of available sensing nodes (114) based on the first (804), second (806), and third inputs (808).
Owner:MOTOROLA SOLUTIONS INC
Cognitive radio system
ActiveUS20070253394A1Assess restrictionRadio/inductive link selection arrangementsTerminal equipmentCognitive radio
A cognitive radio system includes: a state detecting device that scans a frequency band allocated to another radio system than the cognitive radio system to detect a first use-state of the frequency band; a first server including a first gathering unit that receives first information relating to the first use-state and a second gathering unit; a second server that stores a second use-state of the frequency band allocated to the other radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and a notifying unit that notifies a terminal device in the cognitive radio system of information of an available channel based on the first information and the second information.
Owner:KK TOSHIBA
Method and apparatus for distributed sensing management and control within a cognitive radio network
ActiveUS20100069013A1Transmission control/equalisingTransmission monitoringCommunications systemFrequency spectrum
A technique for spectrum sensing management and control for a secondary communication system seeking to utilize another communication system's spectrum is provided (600). Sensor control data is sent from a base station to subscriber units (604). Sensing measurements are taken and sent back to the base station for ranking (608) as sensed feedback information. Comparisons of the sensed feedback information are made to each other and to thresholds aligned with the types of measurements taken (610). An initial ranked channel list is generated (612). Weighting of the initial ranking list and secondary ranking list is followed by re-ranking the channels according to the weighting into a final ranking list (612). The final ranking list is transmitted to the mobile units to enable operation within the other communication system's spectrum within interfering with that system (614). The weighting is based on the type of sensing measurement taken as opposed to the channel.
Owner:MOTOROLA SOLUTIONS INC
Interference based scheduling using cognitive radios
ActiveUS7801490B1Facilitate communication opportunityRoom for improvementTransmission monitoringWireless commuication servicesFrequency spectrumDiversity scheme
Disclosed are systems and methods which implement communication scheduling to reduce service level variance associated with interference. In providing communication scheduling according to embodiments, mult-channel coverage may be provided throughout all portions of a service area to facilitate resource flexibility. According to embodiments, interference metrics are collected in real time for use in scheduling decisions. Synchronized point to multipoint wireless network protocols may be used to facilitate interference metric collection and / or communication scheduling. Uplink and / or downlink communications may be scheduled using one or more diversity attribute in order to achieve a desired level of bandwidth throughput, communication service level variance, and / or communication reliability in spite of the presence of unpredictable interference in the spectrum.
Owner:KIWI NETWORKS +1
Method of partitioning resources in a cognitive radio wireless communication system and system supporting the same
InactiveUS20070115878A1Partly effectiveImprove efficiencyBroadcast service distributionRadio/inductive link selection arrangementsCommunications systemRadio resource
A method of partitioning resources in a CR wireless communication system and a system supporting the same are provided. A new BS receives radio resource status information from a prior BS using a particular frequency band, and requests resource partitioning to the prior BS using a new uplink subchannel defined for communications between BSs. Resource negotiation messages are exchanged over a channel defined between the two BSs so as to efficiently partition resources between the BSs.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Method of managing resources in a cognitive radio communication system
InactiveUS20070117537A1Efficient methodBroadcast service distributionAutomatic exchangesCommunications systemResource information
A resource management method in a Cognitive Radio communication system where at least two Base Stations of heterogeneous networks provide a connection service to Mobile Stations within their service areas is provided. In the method, at least one BS having candidate resources broadcasts its candidate resource information on the downlink of a system information channel. At least one BS lacking in resources searches the downlinks of system information channels from neighbor heterogeneous networks, selects an offer BS among the BSs having candidate resources, and rents resources from the selected offer BS by negotiations.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Simultaneous sensing and data transmission
ActiveUS20080165754A1Minimize interruptionMinimized transmission delayRadio transmissionNetwork planningSelf interferenceFrequency spectrum
In order to satisfy the conflicting requirements for spectrum sensing and QoS of data transmission, it is highly desirable for a cognitive radio system, e.g. IEEE 802.22 WRAN, to perform spectrum sensing and data transmission simultaneously. Embodiments of the invention address critical issues of self-interference generated from a transmission unit to the co-located sensing unit when the simultaneous sensing and data transmission technique is applied. A number of interference mitigation techniques are described and analyses are given.
Owner:STMICROELECTRONICS SRL
Cognitive WIFI radio network
InactiveUS20120257585A1Avoid interferenceAvoid radio interferenceNetwork topologiesWireless commuication servicesTelecommunicationsRadio networks
The invention relates to a cognitive radio (CR) WiFi network which includes a plurality of radio environment aware WiFi terminals, which collect local WiFi interference information and send this information to a CR network management system (NMS). The CR NMS includes a database for storing historical records of the interference information obtained from the terminals, and cognitive engines for analyzing the stored historical interference records and determining terminal-specific transmission and reception parameters. In one embodiment the network implements a deterministic NMS-directed networks-wide TDD / TDM scheduling of WiFi communications for optimal channel re-use and interference avoidance, and a novel terminal synchronization mechanism.
Owner:HER MAJESTY THE QUEEN & RIGHT OF CANADA REPRESENTED BY THE MIN OF IND THROUGH THE COMM RES CENT
Cognitive radio engine based on genetic algorithms in a network
ActiveUS20060009209A1Enable spontaneous inspiration and creativityNetwork traffic/resource managementGenetic modelsTransmitted powerGenetic algorithm
A genetic algorithm (GA) approach is used to adapt a wireless radio to a changing environment. A cognitive radio engine implements three algorithms; a wireless channel genetic algorithm (WCGA), a cognitive system monitor (CSM) and a wireless system genetic algorithm (WSGA). A chaotic search with controllable boundaries allows the cognitive radio engine to seek out and discover unique solutions efficiently. By being able to control the search space by limiting the number of generations, crossover rates, mutation rates, fitness evaluations, etc., the cognitive system can ensure legal and regulatory compliance as well as efficient searches. The versatility of the cognitive process can be applied to any adaptive radio. The cognitive system defines the radio chromosome, where each gene represents a radio parameter such as transmit power, frequency, modulation, etc. The adaptation process of the WSGA is performed on the chromosomes to develop new values for each gene, which is then used to adapt the radio settings.
Owner:VIRGINIA TECH INTPROP INC
Methods of RF sensing control and dynamic frequency selection control for cognitive radio based dynamic spectrum access network systems-cognitive dynamic frequency hopping
ActiveUS20080090581A1Improve protectionError preventionTransmission systemsAccess networkFrequency spectrum
This invention relates to cognitive radio based wireless communications of dynamic spectrum access networks, and more particularly to a method of addressing radio frequency sensing control and dynamic frequency selection control. A method called Cognitive Dynamic Frequency Hopping that is based on the selective Simultaneous Sensing and Data Transmissions is described. The Cognitive Dynamic Frequency Hopping method is further facilitated by a collision avoidance technique. The described method satisfies both reliable and timely RF sensing for guaranteeing licensed user protection, and QoS satisfaction for services of the dynamic spectrum access systems.
Owner:STMICROELECTRONICS SRL
Resource allocation in co-existence mode
ActiveUS8326309B2Assisted mobilityNetwork traffic/resource managementSubstation equipmentQuality of serviceCommunications system
Owner:US SEC THE ARMY THE +1
Apparatus and method for signal detection in a cognitive radio-based wireless communication system
ActiveUS20070100922A1Avoid performance degradationModulation type identificationAmplitude-modulated carrier systemsCognitive radioCalculator
An apparatus and method for signal detection in a CR-based wireless communication system are provided. In the signal detection apparatus, a cyclic power calculator calculates the power spectral density of a cyclo-stationary and periodical signal to be detected with respect to a cyclic frequency and calculates optimum statistics using the power spectral density. A signal detector determines whether a signal exists or not according to the optimum statistics.
Owner:SAMSUNG ELECTRONICS CO LTD
Dynamic cellular cognitive system
ActiveUS8094610B2High quality cognitive communicationReducing and eliminating interferenceNetwork traffic/resource managementCriteria allocationDevice typeFrequency spectrum
Owner:VIRGINIA TECH INTPROP INC
Cognitive radio engine based on genetic algorithms in a network
ActiveUS7289972B2Enable spontaneous inspiration and creativityNetwork traffic/resource managementGenetic modelsAlgorithmTransmitted power
A genetic algorithm (GA) approach is used to adapt a wireless radio to a changing environment. A cognitive radio engine implements three algorithms; a wireless channel genetic algorithm (WCGA), a cognitive system monitor (CSM) and a wireless system genetic algorithm (WSGA). A chaotic search with controllable boundaries allows the cognitive radio engine to seek out and discover unique solutions efficiently. By being able to control the search space by limiting the number of generations, crossover rates, mutation rates, fitness evaluations, etc., the cognitive system can ensure legal and regulatory compliance as well as efficient searches. The versatility of the cognitive process can be applied to any adaptive radio. The cognitive system defines the radio chromosome, where each gene represents a radio parameter such as transmit power, frequency, modulation, etc. The adaptation process of the WSGA is performed on the chromosomes to develop new values for each gene, which is then used to adapt the radio settings.
Owner:VIRGINIA TECH INTPROP INC
Signalling method of detecting hidden incumbent system in cognitive radio environment and channel fractioning method used to enable the method
InactiveUS20080014880A1Reduce impactQuicklySpectral gaps assessmentTransmission path divisionTelecommunicationsCognitive radio
A signaling method between a cognitive radio (CR) base station and a CR terminal in a CR environment, and a channel division method used for the signaling method, includes: detecting a channel usage of an incumbent system, which communicates with a CR base station; sensing an outband channel to communicate with the CR base station; receiving an EOS, which is broadcasted from the CR base station via the outband channel according to a predetermined period; and transmitting a sensing report signal with respect to the channel to the CR base station.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and Apparatus for Cognitive Radio Coexistence
ActiveUS20110286401A1Network topologiesWireless commuication servicesTelecommunicationsCognitive radio
In a non-limiting and exemplary embodiment, a method is provided for sharing secondary cognitive radio resource user related information. A coexistence node receives information on network properties associated with secondary cognitive radio resource users. An upload message is generated and sent, the upload message including for a secondary user database at least information on the received network properties associated with secondary cognitive radio resource users. A location-dependent network map including at least information on network properties is generated. The network map is sent to assist one or more secondary cognitive radio resource users.
Owner:NOKIA TECHNOLOGLES OY
Method, apparatus for dynamic resource allocation method in ofdma-based cognitive radio system and forward link frame structure thereof
Provided are a dynamic resource allocation method and apparatus in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cognitive radio system and a downlink frame structure of the method and apparatus. The method includes a base station (BS) selecting one of an Adaptive Modulation and Coding (AMC) subchannel allocation scheme, in which a subchannel comprising at least one bin comprising a first plurality of continuous subcarriers in a frequency domain, is allocated, and a diversity subchannel allocation scheme, in which a subchannel comprising a second plurality of scattered subcarriers in the frequency domain is allocated, according to a level of frequency selectivity of an unused idle frequency band; and the BS allocating at least one subchannel to a terminal according to the selected subchannel allocation scheme. Accordingly, downlink throughput in the cognitive radio system can be increased.
Owner:ELECTRONICS & TELECOMM RES INST
Method for dynamic frequency selection and system supporting the same in a cognitive radio wireless communication system
ActiveUS20070117517A1Reduce mutual interferenceEfficiently rapidly changeReceivers monitoringRadio/inductive link selection arrangementsCommunications systemEngineering
Dynamic frequency selection based on CR is provided. A CR BS detects an interference-free and unused frequency band. When sensing a new BS that has great signal strength and requires the frequency band during communications in the frequency band, the CR BS releases the frequency band and dynamically selects another frequency band to avoid interference.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Communication method and apparatus for distributed network system where cognitive radio technology is applied
ActiveUS20080171552A1Overcome disadvantagesSmall sizeConductive materialNetwork topologiesComputer networkNetworked system
A communication method and apparatus for a distributed network system where a cognitive radio (CR) technology is used. A communication method of a distributed network system where the CR technology is used includes transmitting adjacent channel information,from at least one first neighbor node adjacent to a source node, first adjacent channel information of the at least one first neighbor node using a pulse signal according to a request ofthe source node; by transmitting, from at least one second neighbor node adjacent to adestination node, second adjacent channel information of the at least one second neighbor node to the destination node using a pulse signal according to a request of the destination node; and exchanging data between the source node and the destination node using a channel that is not currently used, according to the transmitted adjacent channel information.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Space-Time-Frequency Sensing of RF Spectrum in Cognitive Radios
A method detects unused frequency bands in a cognitive radio network. Multiple frequency bands for RF signals are sensed using an antenna array including a plurality of elements coupled to a receive RF chain, in which the plurality of elements are individually controllable. For each frequency band, multiple spatial directions are sensed for the RF signals using the antenna array. A particular frequency band and a particular direction and a particular time slot are assigned as an available frequency band, an available direction and a particular time slot for transmitting RF signals in a cognitive radio if the RF signals are not sensed in the particular spatial direction for the particular frequency band, and in which the RF signals are transmitted by a transmit chain connected to the antenna array.
Owner:MITSUBISHI ELECTRIC RES LAB INC
Method and apparatus for radio spectrum sensing or monitoring
InactiveUS20100195590A1Efficient and cost-effectiveWireless commuication servicesNetwork planningWorkloadRadio frequency
There is provided a system and method of sensing a radio frequency channel to determine activity, determining location, mapping location to existing radio frequency licenses, determining the radio frequency channel to be available and sharing that the radio frequency channel is available. Systems implementing this method may use a single device to perform the method steps or may use several different devices to share the complexity and workload associated with the method. This method is applicable to white space radio and to cognitive radio.
Owner:AIRHOP COMMUNICATIONS
Spectrum sensing function for cognitive radio applications
ActiveUS20090102981A1Television system detailsModulated-carrier systemsWireless microphoneTelevision system
A method and system are disclosed to detect a broad class of signals including Advanced Television Systems Committee (ATSC) digital television (DTV) and wireless microphone signals. This signal detection method performs in Gaussian noise, employing Higher Order Statistics (HOS). Signals are processed in time and frequency domains as well as by real and imaginary components. The spectrum sensing employed also supports Denial of Service (DoS) signal classification. The method can include parameters that may be tailored to adjust the probability of detection and false alarm.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
System and method for the delivery of high speed data services over dedicated and non-dedicated private land mobile radio (PLMR) channels using cognitive radio technology
ActiveUS20100303033A1Low costIncrease speedNetwork topologiesWireless commuication servicesEngineeringMobile radio
A system and method for delivery of high speed data services over dedicated and non-dedicated private land mobile radio (PLMR) channels using cognitive radio technology. The PLMR system provides bi-directional Point-to-Multipoint (PtMP) data communication between a dispatch center and many fixed or mobile remote terminals. A plurality of base stations communicate with a base station controller at the dispatch center and a plurality of remote radios communicate with at least one of the remote terminals. PLMR channel scanners, located in each base station and remote radio, scan the PLMR channels to determine which of the PLMR channels is idle at any point of time so that data communication may take place.
Owner:ONDAS NETWORKS INC
Combined sensing methods for cognitive radio
ActiveUS20080198948A1Television system detailsModulated-carrier systemsFrequency spectrumEngineering
Embodiments of cognitive radio technology can recover and utilize under-utilized portions of statically-allocated radio-frequency spectrum. A plurality of sensing methods can be employed. Transmission power control can be responsive to adjacent channel measurements. Digital pre-distortion techniques can enhance performance. Embodiments of a high DNR transceiver architecture can be employed.
Owner:SILICONWAVES TECH CO LTD
Signal detection in cognitive radio systems
ActiveUS20100081387A1Efficient use ofTransmission monitoringLine-transmission monitoring/testingEnergy estimationComputer science
A cognitive radio wireless device (114) dynamically manages signal detection in a cognitive radio system (100). Spectrum sensing is performed for a first sensing frame on at least one communication channel. At least one observed signal is received (204) on the at least one communication channel. A detection decision (210) is performed to determine if the observed signal is noise or an active signal associated with an active user. The detection decision (210) is performed by comparing observed signal energy estimation with a current detection threshold. The current detection threshold can be an arbitrarily defined threshold or a detection threshold based on a previous detection decision for a sensing frame immediately prior to the first sensing frame.
Owner:MOTOROLA SOLUTIONS INC
Communication initialization method at medium access control layer in a cognitive radio wireless communication system
ActiveUS20070104140A1Minimize detection timeMinimize timeFrequency-division multiplexRadio/inductive link selection arrangementsCommunications systemBroadband
A communication initialization method at a MAC layer in a CR wireless communication system is provided. The use or non-use of a frequency band is sensed over a broadband with a minimized sensing time in a non-interfering manner with existing communication systems.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Method and apparatus for jointly controlling transmit power in cognitive radio communication system
Provided is an apparatus and method for controlling power in a cognitive radio wireless communication system, the method comprising: performing channel scheduling and the first power control for at least one terminal; checking whether the at least one terminal exist within constraint area, and determining whether the at least one terminal within constraint area cause interference to incumbent system; and performing the secondary power control so that an allocating power may be less than the maximum tolerable interference.
Owner:SAMSUNG ELECTRONICS CO LTD
Resource allocation in co-existence mode
ActiveUS20100227622A1Assisted mobilityNetwork traffic/resource managementSubstation equipmentQuality of serviceCommunications system
Techniques are disclosed that allow for resource allocation during situations requiring co-existence in cognitive radios. Even under situations of bandwidth scarcity, the techniques allow various users to be guaranteed quality of service (QoS) by proper distribution and allocation of resources. The techniques allow wireless communication systems to operate in a normal mode and a co-existence mode. In the co-existence mode of operation, sub-frame creation, sharing and zone formation schemes are implemented that enable the existing underlying frame structure to remain intact and inter-operable with the legacy systems and at the same time, provide a guaranteed QoS. The zones effectively create partitions in space, time and frequency, which result in interference avoidance and allow various users in neighboring cells to communicate on the same frequencies.
Owner:US SEC THE ARMY THE +1
Spectrum-sensing algorithms and methods
InactiveUS20080080604A1Minimize overall sensing timeModulated carrier system with waveletsAssess restrictionFrequency spectrumImage resolution
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
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