Abstract: The present disclosure provides a preparation method of a titanium implant with a surface coating in a crater-like porous shape. A titanium substrate is subjected to polishing, cleaning, and first drying in sequence to obtain a pretreated titanium substrate. This step eliminates an influence of roughness and surface impurities of the titanium substrate on roughness and a structure of a coating formed on a surface of the titanium substrate after micro-arc oxidation, so as to obtain a titanium implant with a specific structure and a desirable biological performance. The micro-arc oxidation is conducted using the pretreated titanium substrate as an anode and iron as a cathode in an electrolyte containing sodium phosphate. In this step, a micro-arc oxidation coating is formed on the surface of the titanium substrate to obtain the titanium implant with a surface coating in a crater-like porous shape.

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

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. Said method comprises: 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.

Abstract: The present disclosure discloses a positioning method, device, apparatus and a readable storage medium. The method includes: performing time synchronization with a satellite network; determining position information of a satellite; receiving a downlink positioning signal sent by a network device of the satellite network; determining a transmission delay between the satellite and the terminal according to a time synchronization result and the downlink positioning signal; determining position information of the terminal according to the transmission delay and the position information of the satellite.

Abstract: The embodiments of the present application relate to a method and device for determining a timing advance, applied to the establishment of a timing advance in a random access process of an NTN system. The method in the embodiments of the present application includes: receiving and acquiring relevant parameters in a configuration message, and the relevant parameters include cell common time delay information; and determining, according to the cell common time delay information, an uplink timing advance of an uplink transmission timing position with respect to a configuration message receiving position.

Abstract: This disclosure provides a communication method and apparatus for a satellite communication system, a device, and a readable storage medium. The method includes: transmitting an access request signal to a network side device through an uplink beam; and performing an access and data communication process through a service beam, the service beam being scheduled by the network side device after the access request signal is detected by the network side 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: Embodiments of the present disclosure provide a transmission signal compensation method, a network side device and a terminal. The method includes: obtaining, by a network side device, a reference compensation parameter of a reference transmission link of a terminal; determining, by the network side device, a first compensation parameter of a first transmission link according to the reference compensation parameter, wherein the first transmission link is a transmission link between the terminal and a first satellite; performing, by the network side device, sending or receiving compensation on a transmission signal of the first transmission link according to the first compensation parameter.

Abstract: This disclosure provides a signal sending method, a signal receiving method, a network device and a terminal. The signal sending method includes: determining a position and beam direction of a synchronization signal block SSB to be sent; sending the SSB according to the determined position and beam direction of the SSB.

Abstract: The present invention relates to the field of satellite communications, and in particular to a method for handover of a satellite base station, a terminal, the satellite base station, and a storage medium, for use in solving the problem that the current method for handover of the satellite base station is not accurate. In embodiments of the present invention, a terminal determines a pitch angle when accessing the satellite base station; and if the pitch angle is determined within a preset range, the terminal performs inter-satellite handover.

Abstract: An indication method and an indication device are provided. The method includes obtaining satellite parameters of a current satellite cell and one or more neighbor satellite cells, wherein the current satellite cell is a satellite cell where a terminal is located, the one or more neighbor satellite cells are satellite cells neighboring the current satellite cell; determining a basic list and a detailed list according to the satellite parameters of the current satellite cell and the neighbor satellite cells, wherein the basic list includes basic information of the neighbor satellites, and the detailed list includes detailed information of the neighbor satellites; sending the basic list and/or the detailed list to the terminal.

Abstract: This disclosure provides a satellite beam offset processing method, a device and a medium. The method includes: a network side device indicating a satellite beam offset parameter to a terminal via a broadcast message and/or a dedicated signalling; the terminal receiving the satellite beam offset parameter indicated by the network side device via the broadcast message and/or the dedicated signalling; and the terminal adjusting a communication process of the terminal according to the satellite beam offset parameter.

Abstract: A method and a device for determining sending parameters of a terminal are disclosed. The method includes: determining a pre-estimated signal-to-noise ratio of an uplink on at least one reference position in a cell range corresponding to a satellite beam, determining, according to the pre-estimated signal-to-noise ratio of the uplink, effective isotropic radiated power (EIRP) values corresponding to a preset carrier bandwidth of the uplink, determining, according to the EIRP values corresponding to the preset carrier bandwidth of the uplink, a maximum rate supported by the preset carrier bandwidth of the uplink, determining, according to the maximum rate supported by the preset carrier bandwidth of the uplink, a maximum uplink rate supported by the terminal, and determining an uplink sending maximum EIRP value and/or an uplink sending maximum bandwidth of the terminal according to an uplink rate to be supported by the terminal input by a user.

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

Abstract: The present application provides a method and a device for determining sending parameters of a terminal. The method comprises: firstly determining a pre-estimated uplink signal-to-noise ratio of at least one reference position in a cell range corresponding to a satellite beam, determining, according to the pre-estimated uplink signal-to-noise ratio, an EIRP value corresponding to the preset uplink carrier bandwidth of the corresponding reference position, determining, according to the EIRP value corresponding to the preset uplink carrier bandwidth, a maximum rate supported by the preset uplink carrier bandwidth, determining, according to the maximum rate supported by the preset uplink carrier bandwidth, a maximum uplink rate supported by the terminal, and determining uplink sending parameters of the terminal according to an uplink rate which is inputted by the user, is not greater than the maximum uplink rate supported by the terminal and is to be supported by the terminal.

Abstract: A method, a device, a terminal and a service device for determining satellite communication system parameters are provided. The method includes: obtaining gateway station information, according to an ephemeris information table or a system message; calculating feeder link information of a current communication link, according to the obtained gateway station information; and determining a satellite communication system parameter of the terminal according to the feeder link information.

Abstract: This disclosure provides a signal sending method, a signal receiving method, a network device and a terminal. The signal sending method includes: determining a position and beam direction of a synchronization signal block SSB to be sent; sending the SSB according to the determined position and beam direction of the SSB.

Abstract: The embodiments of the present application relate to a method and device for determining a timing advance, applied to the establishment of a timing advance in a random access process of an NTN system. The method in the embodiments of the present application includes: receiving and acquiring relevant parameters in a configuration message, wherein the relevant parameters include cell common time delay information; and determining, according to the cell common time delay information, an uplink timing advance of an uplink transmission timing position with respect to a configuration message receiving position.

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: A method, a device and an apparatus for selecting a user signature vector, and a storage medium are provided. The method includes: acquiring a measurement result of an actual channel state of a terminal; determining a measurement result interval to which the measurement result belongs, based on the measurement result and a preset measurement threshold; determining a candidate user signature vector set corresponding to the measurement result interval to which the measurement result belongs, based on a preset correspondence between measurement result intervals and user signature vector sets, where the candidate user signature vector set includes one or more user signature vectors; and selecting the user signature vector from the candidate user signature vector set.