Abstract: A downhole throttling device based on wireless control includes an inlet nozzle, a throttling assembly, an electrical sealing cylinder, a gas guide cylinder, a lower adapter sleeve, an end socket, a female sleeve, and electrical components. The inlet nozzle is connected to the throttling assembly, the throttling assembly is connected to the electrical sealing cylinder and the gas guide cylinder, the electrical sealing cylinder and the gas guide cylinder are both connected to the lower adapter sleeve, the lower adapter sleeve is respectively connected to the end socket and the female sleeve, and the electrical components are arranged in the electrical sealing cylinder. A throttling effect is achieved by detecting the temperature and pressure in a tube by a temperature/pressure sensor in the electrical components and controlling a motor to rotate a movable valve in the throttling assembly by a circuit control assembly, thereby achieving wireless control over downhole throttling.

Abstract: Embodiments of this application disclose a data transmission method and a communications apparatus. A method in an embodiment includes: sending, by a network device, first data to a terminal in a first subframe through a first channel, where the first channel is a channel occupied in a channel system by a service between the network device and the terminal; performing, by the network device, channel listening on a channel that is not occupied in the channel system by the service; and when there is a second channel in an idle state, sending, by the network device, second data of the service to the terminal in a second subframe through the first channel and the second channel, where the second subframe is after the first subframe. The service includes the first data and the second data, and a data frame of the service includes the first subframe and the second subframe.

Abstract: Embodiments of this application disclose a data transmission method and a communications apparatus. A method in an embodiment includes: sending, by a network device, first data to a terminal in a first subframe through a first channel, where the first channel is a channel occupied in a channel system by a service between the network device and the terminal; performing, by the network device, channel listening on a channel that is not occupied in the channel system by the service; and when there is a second channel in an idle state, sending, by the network device, second data of the service to the terminal in a second subframe through the first channel and the second channel, where the second subframe is after the first subframe. The service includes the first data and the second data, and a data frame of the service includes the first subframe and the second subframe.

Abstract: The present disclosure relates to inter-cell beam coordination scheduling methods and related devices. One example inter-cell beam coordination scheduling method includes receiving, by a first wireless access device serving a coordinated cell, a coordination scheduling request specific to an edge user terminal of a serving cell, where the coordination scheduling request carries an indication of a downlink narrow-transmission beam set DX1, and the downlink narrow-transmission beam set DX1 is a downlink narrow-transmission beam set that satisfies a principle of minimal interference and that is determined by the edge user terminal through beam training, and in a slot in which downlink scheduling is performed on the edge user terminal in the serving cell, preferably using, by the first wireless access device, a narrow-transmission beam in the downlink narrow-transmission beam set DX1 to schedule a camping user terminal of the coordinated cell in downlink.

Abstract: The present disclosure relates to inter-cell beam coordination scheduling methods and related devices. One example inter-cell beam coordination scheduling method includes receiving, by a first wireless access device serving a coordinated cell, a coordination scheduling request specific to an edge user terminal of a serving cell, where the coordination scheduling request carries an indication of a downlink narrow-transmission beam set DX1, and the downlink narrow-transmission beam set DX1 is a downlink narrow-transmission beam set that satisfies a principle of minimal interference and that is determined by the edge user terminal through beam training, and in a slot in which downlink scheduling is performed on the edge user terminal in the serving cell, preferably using, by the first wireless access device, a narrow-transmission beam in the downlink narrow-transmission beam set DX1 to schedule a camping user terminal of the coordinated cell in downlink.

Abstract: Various examples of the present disclosure describe a method for configuring a quiet period in a CR system and a device thereof. The method includes: determining, by a base station, a maximum value of a quiet period parameter of a CR system based on maximum duration of interference which a radio authorization system tolerates and maximum loss of capacity which the CR system tolerates; determining a sensing algorithm based on a detecting performance requirement and the maximum value of the quiet period parameter; determining a value of the quiet period parameter based on the sensing algorithm; and sending the quiet period parameter to a terminal of the CR system. When the examples of the present disclosure are employed, the rationality of the configuration of the quiet period parameter of the CR system is improved and the capacity loss of the CR system is reduced when the interference to the authorization system is reduced.

Abstract: The present disclosure provides a dynamic spectrum allocation method and a dynamic spectrum allocation device. In the method, a centralized node performs spectrum allocation and transmits a spectrum allocation result to each communication node, so that the communication node operates at a corresponding spectrum resource in accordance with the spectrum allocation result and performs statistics of communication quality measurement information. The centralized node receives the communication quality measurement information reported by the communication node, and determines whether or not it is required to trigger the spectrum re-allocation for the communication node in accordance with the communication quality measurement information about the communication node. When it is required to trigger the spectrum re-allocation, the centralized node re-allocates the spectrum for the communication node.

Abstract: A method and device for determining available spectrums is disclosed in embodiments of the present invention. By applying the technical solution of the embodiments of the present invention, with consideration on the bi-directionality of the interference between wireless communication systems, when introduction of the cognitive system is required, the corresponding frequency will be determined as an available frequency only in the case the incumbent system and the cognitive system can be simultaneously guaranteed to meet the corresponding coexistence criterion among the corresponding frequency and adjacent frequencies thereof, thus ensuring that the determined available frequency band guarantees that the normal operation of the incumbent system is not interfered by the cognitive system while ensuring that the newly-introduced cognitive system can also operate normally without interference of the incumbent system, thereby improving the communication quality of the wireless communication systems.

Abstract: The cognitive radio cell acquires a scheme dividing frequency band resources into a number of sub-bands and corresponding silent period time frequency pattern, when performing silence on the sub-band which the cognitive radio cell works on according to the silence period time position of each sub-band defined in the silent period time frequency pattern, spectrum sensing on corresponding sub-band is implemented by radio spectrum sensing system or cognitive radio cell.

Abstract: Various examples provide a method and a system for spectrum handover in cognitive radio (CR) systems. According to the method, after detecting a user of an authorized system appears at a current working frequency, the base station generates a spectrum handover command and sends the spectrum handover command via a channel identified by the CR DWNDI to instruct the UEs in the cell to perform spectrum handover according to the spectrum handover command.

Abstract: Disclosed are a method and device for determining and assisting in determining a back-up frequency in a cognitive radio system. A first cognitive system shares the wireless communication spectrum resources of an incumbent system, and the method thereof for determining a back-up frequency comprises: through a terminal, a first cognitive system obtaining a back-up frequency of a second cognitive system which has overlapping coverage in a target area in an overlapping coverage area; and according to the back-up frequency of the second cognitive system in the overlapping coverage area, selecting from the wireless communication spectrum resources at least one frequency as a back-up frequency in the target area. When determining the back-up frequency, the first cognitive system can refer to the back-up frequency of the second cognitive system to conduct determination, thereby optimizing the system performance.

Abstract: Embodiments of the present application relate to the field of wireless communications, and in particular, to a method and an apparatus for cell search in a sensor system, used for solving the problem in the prior art that an operation time delay is long in cell selection and cell residence. The method of the embodiments of the present application comprises: a terminal determining different types of frequency points in frequency points supported by the sensor system, the frequency points of the sensor system being divided, in a diminishing sequence of priorities, into a first type of authorization frequency point, a first type of non-authorization frequency point, a second type of authorization frequency point and a second type of non-authorization frequency point; and performing, in a diminishing sequence of priorities, cell search and cell residence on the frequency points supported by the sensor system.

Abstract: The embodiments of the present application relate to the technical field of wireless communications, and in particular to a method, system and device for triggering and performing spectrum sensing, used for solving the problem in the prior art that if the sensing period is set too long, a decline of service quality between an authorization system and a cognitive system or even a network paralysis will be caused due to interference; and if the sensing period is set too short, an increase in power consumption of devices and a waste of spectrum resources will be caused. The method for performing spectrum sensing in the embodiments of the present application includes: a sensing node judging whether or not the channel quality has declined to the requirement for performing in-band spectrum sensing; and after determining that the channel quality has declined to the requirement for performing in-band spectrum sensing, the sensing node performing in-band spectrum sensing.

Abstract: The present disclosure provides a dynamic spectrum allocation method and a dynamic spectrum allocation device. In the method, a centralized node performs spectrum allocation and transmits a spectrum allocation result to each communication node, so that the communication node operates at a corresponding spectrum resource in accordance with the spectrum allocation result and performs statistics of communication quality measurement information. The centralized node receives the communication quality measurement information reported by the communication node, and determines whether or not it is required to trigger the spectrum re-allocation for the communication node in accordance with the communication quality measurement information about the communication node. When it is required to trigger the spectrum re-allocation, the centralized node re-allocates the spectrum for the communication node.

Abstract: Various examples of the present disclosure describe a random access method and device in a CR system. The method includes: generating, by a base station device, a spectrum handover command, wherein the spectrum handover command comprises random access backoff time parameter information; and sending, by the base station device, the spectrum handover command to a user equipment in a cell to instruct the UE to initiate, during a spectrum handover procedure, a random access procedure using the random access backoff time parameter information. According to the various examples of the present disclosure, the random access backoff time parameter information is carried in the spectrum handover command, so that a random access conflict is suppressed during the spectrum handover procedure of the CR system. A large number of UEs that intensively perform random access on a target working frequency are pre-dispersed in time.

Abstract: The present application relates to of the communication field and discloses a method, device and system for implementing frequency point switch 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 switch from the working frequency point currently used thereby to the candidate working frequency point by way of a frequency point switching command. In this way, the UE deployed in the cognitive frequency band can achieve frequency point switch quickly and accurately according to the instruction from the cognitive base station when an incumbent user accesses the working frequency point currently used by the UE, effectively avoiding interference to the incumbent user and thereby ensuring the service performance and service continuity of the system.

Abstract: The present disclosure provides a method and an apparatus for obtaining an idle spectrum. The method includes: obtaining, by a central management unit, configuration information of a transmitter of an authorized system, and obtaining geographic location information of candidate sense nodes; selecting, by the central management unit, sense nodes from the candidate sense nodes according to the configuration information and the geographic location information, and informing the selected sense nodes to perform spectrum sensing; and receiving, by the central management unit, sensing results of the selected sense nodes, and obtaining information of an idle spectrum according to the sensing results.

Abstract: Disclosed are a method and device for determining and assisting in determining a back-up frequency in a cognitive radio system. A first cognitive system shares the wireless communication spectrum resources of an incumbent system, and the method thereof for determining a back-up frequency comprises: through a terminal, a first cognitive system obtaining a back-up frequency of a second cognitive system which has overlapping coverage in a target area in an overlapping coverage area; and according to the back-up frequency of the second cognitive system in the overlapping coverage area, selecting from the wireless communication spectrum resources at least one frequency as a back-up frequency in the target area. When determining the back-up frequency, the first cognitive system can refer to the back-up frequency of the second cognitive system to conduct determination, thereby optimizing the system performance.

Abstract: Embodiments of the present application relate to the field of wireless communications, and in particular, to a method and an apparatus for cell search in a sensor system, used for solving the problem in the prior art that an operation time delay is long in cell selection and cell residence. The method of the embodiments of the present application comprises: a terminal determining different types of frequency points in frequency points supported by the sensor system, the frequency points of the sensor system being divided, in a diminishing sequence of priorities, into a first type of authorization frequency point, a first type of non-authorization frequency point, a second type of authorization frequency point and a second type of non-authorization frequency point; and performing, in a diminishing sequence of priorities, cell search and cell residence on the frequency points supported by the sensor system.

Abstract: A method and device for determining available spectrums is disclosed in embodiments of the present invention. By applying the technical solution of the embodiments of the present invention, with consideration on the bi-directionality of the interference between wireless communication systems, when introduction of the cognitive system is required, the corresponding frequency will be determined as an available frequency only in the case the incumbent system and the cognitive system can be simultaneously guaranteed to meet the corresponding coexistence criterion among the corresponding frequency and adjacent frequencies thereof, thus ensuring that the determined available frequency band guarantees that the normal operation of the incumbent system is not interfered by the cognitive system while ensuring that the newly-introduced cognitive system can also operate normally without interference of the incumbent system, thereby improving the communication quality of the wireless communication systems.