Patent application number | Description | Published |
20090034508 | METHOD AND APPARATUS FOR SPECTRUM SHARING BETWEEN AN INCUMBENT COMMUNICATIONS SYSTEM AND A COGNITIVE RADIO SYSTEM - Efficient frequency spectrum sharing between at least one incumbent communication system(s) ( | 02-05-2009 |
20090061779 | METHOD FOR ADDRESSING USER LOCATION ERRORS IN A COGNITIVE RADIO SYSTEM - A cognitive radio (CR) system ( | 03-05-2009 |
20090141662 | METHOD AND APPARATUS FOR OPERATING A NODE WITHIN A MOBILE AD HOC COGNITIVE RADIO NETWORK - A method and apparatus for operation of a node within a mobile ad hoc cognitive radio network is provided. The method includes sensing at least one assigned communications channel. Sensing at least one assigned communications channel includes measuring a value of at least one parameter corresponding to the communications channel. The method further includes comparing the measured value of the at least one parameter with a set of stored values of the at least one parameter to determine a change in the measured values. Finally a sleep mode of the node is activated for a time period, wherein the time period is determined using the change in the measured values. | 06-04-2009 |
20090197627 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT POWER AND INCUMBENT PROTECTION IN A COGNITIVE RADIO SYSTEM - A cognitive radio (CR) device ( | 08-06-2009 |
20090298522 | COEXISTENCE AND INCUMBENT PROTECTION IN A COGNITIVE RADIO NETWORK | 12-03-2009 |
20100081449 | METHOD AND APPARATUS FOR OPTIMIZING SPECTRUM UTILIZATION BY A COGNITIVE RADIO NETWORK - A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of criteria is developed for selecting a highest ranked secondary base station for operation within a primary's spectrum. The ranking may be adapted based on mobility of the secondary's subscriber; and as such the secondary system communicates within the primary's spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) network to operate within an incumbent network's spectrum. | 04-01-2010 |
20100144357 | ALLOCATION OF CHANNELS IN A DEDICATED FREQUENCY SPECTRUM ON A SECONDARY BASIS - Allocation of channels in a dedicated frequency spectrum on a secondary basis. A direct mode communication request ( | 06-10-2010 |
20100238798 | SYSTEM AND METHOD FOR MAINTAINING A BACKUP RADIO OPERATING PARAMETER LIST IN A SECONDARY USE COMMUNICATION SYSTEM - A radio communication system ( | 09-23-2010 |
20100304680 | METHOD AND APPARATUS FOR UTILIZING A TRANSMISSION POLARIZATION TO REDUCE INTERFERENCE WITH A PRIMARY INCUMBENT SIGNAL - A mobile station ( | 12-02-2010 |
20100330919 | METHOD FOR DATABASE DRIVEN CHANNEL QUALITY ESTIMATION IN A COGNITIVE RADIO NETWORK - 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. | 12-30-2010 |
20110087639 | METHOD AND APPARATUS FOR AUTOMATICALLY ENSURING CONSISTENCY AMONG MULTIPLE SPECTRUM DATABASES - An apparatus and method of providing accurate and consistent open spectrum results for secondary devices from different geo-location databases is presented. The results, which may be independently derived by each database, are independent of the database queried. The comparison permits some amount of latitude in spatial and temporal consistency between the databases as errors are only indicated if the temporal or spatial discrepancies are pervasive. In addition, large percentages of different locations showing discrepancies when compared also lead to corrective action being taken. Corrective actions that may be taken include forcing problematic databases to update, shunting requests by secondary devices in the problematic locations to acceptable databases or shutting down the problematic databases entirely. | 04-14-2011 |
20110124291 | METHOD FOR QUIETING AND SENSING IN A SECONDARY COMMUNICATIONS SYSTEM - A method of retaining channel use by a secondary system is described. A secondary channel used during periods of normal communication between a secondary transmitter and receiver is split into sub-bands for use during a quiet period containing quiet phases. During the quiet period, while the transmitter communicates with the receiver on one sub-band, the receiver simultaneously senses for incumbent devices on another sub-band, as well as vice-versa. Transmission and sensing do not occur simultaneously on the same sub-band and transmission is limited to only one of the sub-bands. Transmission and sensing are performed by both the transmitter and the receiver on every sub-band over the course of the quiet period. The locations of secondary receivers are determined and employed during scheduling such that devices sufficiently separated from each other transmit during different quiet phases and transmit and sense in sub-bands separated by another sub-band. | 05-26-2011 |
20120238309 | METHOD AND APPARATUS FOR OPTIMIZING SPECTRUM UTILIZATION BY A COGNITIVE RADIO NETWORK - A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of criteria is developed for selecting a highest ranked secondary base station for operation within a primary's spectrum. The ranking may be adapted based on mobility of the secondary's subscriber; and as such the secondary system communicates within the primary's spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) network to operate within an incumbent network's spectrum. | 09-20-2012 |
20130012250 | SYSTEM AND METHOD FOR MAINTAINING A BACKUP RADIO OPERATING PARAMETER LIST IN A SECONDARY USE COMMUNICATION SYSTEM - A radio communication system ( | 01-10-2013 |
20140153627 | SYSTEMS, METHODS, AND DEVICES FOR IMPROVING SIGNAL QUALITY - Improving signal quality by sampling an intermediate frequency signal by an analog-to-digital converter (ADC) and determining spectral characteristic data of the output signal of the ADC, and processing the spectral characteristic data to identify blocking signals and blocking spur signals that interfere with any desired signals. An adjustment is made to the frequency of one or more oscillators to reduce the interference resulting from the blocking signals if a ratio of the desired signal level to the total interfering blocker spur level is below a threshold. | 06-05-2014 |
20140243034 | METHOD AND APPARATUS FOR CREATING A TALKGROUP - A method and apparatus for talkgroup creation are provided herein. During operation context-aware circuitry will continuously monitor a given area for a specific event or condition. When triggered, the context-aware circuitry will notify a radio controller of the trigger causing talkgroups to be formed specific to the event or condition that is detected. Thus, various radios will be included within a talkgroup as a direct result of the triggering event or condition. | 08-28-2014 |