Abstract: Embodiments of the present application relates to a method and device for random access, for use in resolving the problem that no current random access process can satisfy requirements of a satellite communication system. The method of the embodiments of the present application comprises: receiving and obtaining a related parameter in a configuration message, the related parameter comprising common cell delay information; generating a physical random access channel random access preamble (PRACH Preamble) sequence, and determining an uplink sending timing location according to the common cell delay information; and sending the PRACH Preamble sequence on a time-frequency resource corresponding to the uplink sending timing location. A relative transmission delay and a multi-path channel delay from a terminal, to a satellite, and to a base station are compensated according to the determined uplink sending timing location, thereby reducing overheads of a PRACH channel.

Abstract: Disclosed in the embodiments of the present application are a network access method and apparatus for a terminal, an electronic device and a storage medium. The method includes a terminal determining a beam sweeping interval and a sweeping frequency point, and receiving a base station signal sent or forwarded by a satellite; determining the downlink signal quality of the base station according to the base station signal; and if it is determined, according to the downlink signal quality, that the terminal can successfully find a satellite, executing a network access process of the terminal. In the embodiments of the present application, the downlink signal quality of a base station is determined by means of a base station signal sent or forwarded by a satellite; and it is further determined, according to the downlink signal quality, whether a terminal can successfully find a satellite.

Abstract: Provided in the embodiments of the present disclosure are an information reporting method, a terminal and a base station. The method includes receiving first indication information that is configured for a terminal by a base station and is used for reporting channel state information (CSI) in an energy-saving state; receiving first downlink control information (DCI) that is sent by the base station and is scrambled by a power saving radio network temporary identity (PS-RNTI); and performing CSI measurement according to the first indication information and/or the first DCI, and reporting a CSI measurement result to the base station. Therefore, by means of the present disclosure, a base station can obtain a CSI measurement result in a timely manner and perform effective scheduling, and a terminal executes CSI reporting in an energy-saving state under the instruction of the base station, to improve the efficiency of CSI reporting.

Abstract: A method and apparatus for transmitting downlink control information. In the present invention, transmitted downlink control information at least comprises one or more of the following information fields: a first information field used for indicating the frequency domain resources occupied by the data resources scheduled by the DCI, a second information field used for indicating the time frequency resources occupied by the data resources scheduled by the DCI, and a third information field used for indicating the scheduled N users. As the resource size occupied by the transmission resources in the frequency domain and/or in the time domain is indicated by means of the downlink control information, transmission of downlink control information can be implemented in flexible resource allocation scenarios having variable transmission time intervals.

Abstract: Embodiments of the present application provide a power-saving information transmission method, a base station, and a terminal. The method includes configuring, by a base station, first power-saving information of a first moment of a first carrier, the first power-saving information being used for indicating transmission of first information of the first carrier and/or a second carrier; and transmitting, by the base station, the first power-saving information. Embodiments of the present application can solve the problem that how to configure the power-saving information of multiple carriers in case that the base station is provided with multiple carriers and a terminal achieves a power-saving effect, and avoid or mitigate the problem that in case that different energy saving information are configured for different carriers, the terminal cannot save energy as long as the configuration for one carrier is not configured for energy saving, to reduce the power consumption of the terminal.

Abstract: Disclosed are a beam switching method and apparatus, relating to the field of wireless communications, and used for reducing beam switching time and reducing the signaling overhead of switching. The method comprises: determining a beam that needs to be switched, and obtaining the beam identifier of a switched beam and physical random access channel (PRACH) resource indication information; and after the switching of the beam is completed, transmitting, to a network device on the time frequency resource of the switched beam indicated by the PRACH resource indication information, a PRACH signal used for indicating that the switching of the beam is completed. By means of the beam switching method, a beam switching process does not need to transmit an RRC signaling to the network device, and does not need to wait to establish an RRC connection with the network device.

Abstract: A control method and a control device in a heterogeneous three-dimensional hierarchical network, and a communication system are provided. The control method includes: obtaining a coverage mode of a terminal; when the coverage mode is single-layered sub-network coverage, setting a non-ground mobile communication sub-network or a ground mobile communication sub-network corresponding to the single-layered sub-network coverage to be in a standalone operating mode or an intra-layer carrier aggregation mode; and when the coverage mode is multi-layered sub-network coverage, setting the non-ground mobile communication sub-network corresponding to the multi-layered sub-network coverage, or the ground mobile communication sub-network and the non-ground mobile communication sub-network corresponding to the multi-layered sub-network coverage, to be in a cross-layer carrier aggregation mode.

Abstract: Disclosed are beam training methods and devices. A beam training method includes: a transmitting end determining a first mapping relationship between BPL identifiers, CRIs, and transmitting beams; the transmitting end configuring a first reference signal resource for a receiving end, and transmitting configuration information of the first reference signal resource to the receiving end, the configuration information including a first BPL identifier; the transmitting end determining a first transmitting beam; the transmitting end transmitting a reference signal to the receiving end, by using the first transmitting beam within the first reference signal resource, so that the receiving end receives the reference signal on the first reference signal resource.

Abstract: Disclosed in the embodiments of the present application are a method and a device for eliminating non-line of sight (NLOS) in time of arrival (TOA) measurement values, and a terminal. The method includes: modeling a probability density of the first TOA measurement values from each base station to a terminal into a Gaussian mixture model, and selecting the TOA measurement values modeled into the Gaussian mixture model; performing NLOS identification on the selected TOA measurement values to obtain an identification label; and the identification label is used to indicate whether the selected TOA measurement values correspond to NLOS; and correcting the selected TOA measurement values according to the identification label, to eliminate errors caused by NLOS in the selected TOA measurement values.

Abstract: Disclosed are a signal transmission method and device. In the present application, the method includes: a base station configuring sending resources for at least two of a first signal, a second signal and a third signal, and sending the at least two signals according to the sending resources for the at least two signals, wherein in the at least two signals, the transceiving of one signal is indicated by at least one of the other signals; the first signal is a signal for at least one of the functions of synchronization, wave beam measurement, wave beam acquisition and RRM; the second signal is a signal for at least one of the functions of synchronization, fine synchronization, wave beam measurement, wave beam acquisition, RRM, CSI measurement and terminal wakeup; and the third signal is a signal for paging.

Abstract: A feeder link handover method, device and apparatus, and a handover method, device and apparatus for user equipment belonging to a satellite are provided. The method includes: interacting with a target gateway by a source gateway and determining a handover time instant T and/or a target cell activation time instant T?, wherein the handover time instant T is a time instant at which a previous feeder link is disconnected and establishment of a new feeder link is initiated, the target cell activation time instant T? is T+a time period ? (delta) required for the establishment of the new feeder link; initiating a feeder-link handover at the handover time instant T, and instructing a user equipment to synchronize with a target cell at the T?.

Abstract: Systems and methods are described for creating three dimensional models of building objects by creating a point cloud from a plurality of input images, defining edges of the building object's surfaces represented by the point cloud, creating simplified geometries of the building object's surfaces and constructing a building model based on the simplified geometries. Input images may include ground, orthographic, or oblique images. The resultant model may be scaled according to correlation with select image types and textured.

Abstract: The present disclosure provides a terminal device locating method, an apparatus and a storage medium. The method includes: receiving, by a first network element, a reference signal; determining a time-domain channel response of the reference signal according to the reference signal; performing filtering processing on the time-domain channel response to obtain a line-of-sight time-domain signal; determining subcarrier phase information of a line-of-sight frequency-domain signal according to the line-of-sight time-domain signal, where the subcarrier phase information is used to determine location information of a terminal device. The present disclosure can improve the accuracy of locating the terminal device.

Abstract: The present application relates to a Doppler shift compensation method and device. The method includes: indicating by a network side, to a terminal side, Doppler compensation reference information preset for each beam cell in a satellite coverage area, so that a terminal accessing the beam cell can timely obtain a terminal side Doppler compensation value.

Abstract: A communication method, a device, an apparatus and a readable storage medium are provided. The communication method includes: receiving first information transmitted by a first UE; and when determining that the first UE supports a T2T service, processing the first information as follows: when the first information needs to be processed through a control plane, transmitting the first information to a second UE through a control plane channel; and when the first information needs to be processed through a data plane, transmitting the first information to the second UE through an inter-satellite channel.

Abstract: A random access method, a user equipment and a network-side equipment are provided, related to the field of communication technology. The method includes: sending to a network-side equipment, by a user equipment, a service beam resource request message required for a random access, in a control beam of a hopping beam; receiving in the control beam, by the user equipment, resource configuration information sent by the network-side equipment; and initiating, by the user equipment, a random access process in a service beam of the hopping beam according to the resource configuration information.

Abstract: The present application discloses a method and device for determining information, which are used to implement terminal positioning based on carrier signal phase measurement values and improve terminal positioning accuracy. The method for determining information provided by the present application includes: receiving the carrier signal discontinuously sent by the network side; determining the carrier signal phase measurement value for positioning the terminal based on the carrier signal discontinuously sent by the network side.

Abstract: Systems, methods, and non-transitory computer-readable media can determine sensor data captured by at least one sensor of a vehicle while navigating an environment over a period of time. Information describing one or more agents associated with the environment during the period of time can be determined based at least in part on the captured sensor data. A schema-based encoding describing the environment during the period of time can be generated based at least in part on the determined information and a scenario schema, wherein the schema-based encoding provides a structured representation of the environment during the period of time.

Abstract: Disclosed in embodiments of the present application are a resource allocation method, a device, and a medium. The method comprises: a terminal device determines N NPRACH transmission resources corresponding to a sending period of an ephemeris-bearing SIB bearing according to said sending period as well as configuration information for an NPRACH transmission resource indicated in an SIB2, where N is a natural number greater than zero; the terminal device randomly selects one NPRACH transmission resource from among the N NPRACH transmission resources; and the terminal device performs random access on a network device by means of the selected NPRACH transmission resource.

Abstract: Methods for selecting and configuring a random access channel, an access device and a network device are provided.