Abstract: This application discloses a satellite network communication method and a related apparatus, and relates the field of communications technologies. The method includes: determining user device address information of a user device, where the user device address information includes a second sub-area identifier EID and a user device identifier UDID of the user device, the second EID is used to indicate a second sub-area in which the user device is currently located, and the second sub-area is one of a plurality of sub-areas divided from the earth surface; and sending, by the user device, the user device address information to a first satellite. The identifier of the sub-area in which the user device is located is included in the user device address information. This can adapt to a high-speed mobility feature of a satellite on a satellite network and improve communication efficiency of the satellite network.

Abstract: The application provides a communication method, an apparatus, and a system that are used in a satellite network. A user terminal receives, on a management channel, a sounding signal sent by a management satellite. The management satellite manages one or more serving satellites. The user terminal sends a respiratory signal to the management satellite. The respiratory signal carries information about the user terminal. The information about the user terminal is used to determine information about a serving satellite that serves the user terminal. The management satellite or a ground station may uniformly schedule the serving satellite to serve the user terminal. When the serving satellite is switched, a negotiation between satellites may be omitted.

Abstract: A data processing method for a data processing system having a first communications node and a second communications node where the first communications node corresponds to a first blockchain node and the second communications node corresponds to a second blockchain node that maintains a same block chain as the first blockchain node, the method including obtaining, by the first communications node, to-be-verified data when a terminal camps on a target cell, where the to-be-verified data is obtained based on camping information of the terminal, and the target cell is a cell within signal coverage of the first communications node sending, by the first communications node, the to-be-verified data to the second communications node, so that the second communications node verifies the to-be-verified data based on the second blockchain node, and obtaining, by the first communications node, a target block if the verification succeeds.

Abstract: A channel prediction method and a related device, where the method includes: obtaining a first channel coefficient sequence in a first time period, where the first channel coefficient sequence includes a plurality of complex values of a channel coefficient; and determining a prediction value of the channel coefficient in a second time period based on the first channel coefficient sequence and a preset vocabulary of channel changes, where the preset vocabulary of channel changes includes a mapping relationship between a channel change value index and each change value of the channel coefficient, and where the second time period is later than the first time period.

Abstract: Embodiments of the present invention disclose a road condition information sharing method. The method includes: receiving, by a server, a road condition information request sent by a first terminal, where the road condition information request carries a road condition position of concern; determining, by the server, a second terminal according to the road condition position of concern, where the second terminal has a road condition recording capability, and a distance between the second terminal and the road condition position of concern is less than a preset threshold; and sending, by the server, a road condition sharing request to the second terminal, so that the second terminal shares a road condition according to the road condition position of concern.

Abstract: An LDPC code encoding and modulation method and a communications apparatus are provided to resolve a problem of poor transmission performance and low transmission reliability that are caused in an existing modulation method. Under the method, an information bit sequence Sb can be obtained. The Sb can be encoded by using a LDPC matrix H to generate an encoded code sequence Sc. The Sc can be modulated to obtain a modulated symbol sequence SM. This modulation may include mapping bits in a least reliable code block in the Sc to non-least reliable bit locations for constellation modulation. SM can be sent to a receive end. In this way, reliability of all symbols in the SM is relatively high and uniform. A bit error rate can be effectively reduced, so that encoding performance is improved and more reliable transmission is implemented.

Abstract: Embodiments of the present invention disclose a polar polar code encoding and decoding method and an apparatus. The decoding method may include: obtaining a polar polar code a code length N of the polar polar; determining a survivor path quantity L of the polar polar code according to the code length N of the polar polar code and a signal-to-noise ratio SNR for receiving the polar polar code, where L is a positive integer; and performing successive cancellation list SCL decoding on the polar polar code according to the survivor path quantity L, to obtain L survivor paths, and checking at least one of the L survivor paths, to obtain a decoding result of the polar polar code. The present invention can address a prior-art disadvantage that decoding is rather complex because of a fixed survivor path quantity L for polar code decoding.

Abstract: A coding scheme determining method and apparatus are provided. In various embodiments, a base station device sends, to a terminal device, higher layer control signaling, physical layer control signaling, or a synchronization signal that carries coding scheme indication information. In some embodiments, a terminal device sends, to a base station device, a capability information report message that carries coding scheme indication information, so that the base station device or the terminal device can clearly and flexibly indicate a coding scheme. At least one information block size IBS greater than or equal to a preset first specified value X is determined, and an IBS is selected from the at least one IBS to code an information block of bits or a code block of the information block of bits. X and a coding scheme are determined by a scenario, information type, and/or service type.

Abstract: This application provides encoding and decoding methods to reduce retransmission in satellite communication. A sending apparatus obtains an information transport block, where the information transport block includes a plurality of code blocks; and generates a redundant code block based on at least two of the plurality of code blocks. The at least two code blocks and the redundant code block are sent over a satellite channel after channel coding. A receiving apparatus receives the to-be-decoded information over the satellite channel, calculates, based on the to-be-decoded information of the at least two code blocks and the redundant code block, an a priori log-likelihood ratio of a to-be-decoded bit, and combines the a priori log-likelihood ratio and a log-likelihood ratio obtained after demodulation, to obtain a diversity gain. Decoding is performed based on the combined log-likelihood ratio. This method improves decoding accuracy and reduces the need for retransmission.

Abstract: This application discloses a user sequence transmission method, a network device, and a terminal device. The method includes: sending, by a network device, first signaling to a terminal device, where the first signaling includes first information indicating a quantity of user sequences in a first user sequence space, and the user sequences in the first user sequence space include a universal set of user sequences used by the terminal device served by the network device; receiving, by the network device, a first user sequence sent by the terminal device based on the first information; and performing, by the network device, user detection and/or communication parameter estimation based on the first user sequence.

Abstract: A communication method includes obtaining, by a first device, first target information, determining, by the first device based on the first target information, a data transmit array element from light emitting diodes (LEDs) of the first device, where each data transmit array element of the first device includes at least one LED, and sending, by the first device, to-be-sent data to a data receive array element of a second device using the data transmit array element, where each data receive array element of the second device includes at least one LED of the second device.

Abstract: Embodiments of the present invention provide a communication enhancement method for a mobile terminal, and a mobile terminal. A force touch technology and a communications technology are combined, to enhance user communication by means of force touch; and a quantity of transmit and receive antennas, a transmit power, a transmission bandwidth, a transmission rate, a quantity of connections, and the like for mobile communication are adjusted, thereby providing users with better communication experience. The method provided in the present invention includes: obtaining, by a mobile terminal, a sensing signal generated from a press of a user; detecting, by the mobile terminal, a strength value of the sensing signal; and determining, by the mobile terminal, an uplink communication transmission capability according to the strength value of the sensing signal.

Abstract: The present disclosure provides a signal processing method, including: performing discrete Fourier transform (DFT) on a data symbol block including M data symbols, where the M data symbols obtained after the DFT belong to K carriers, and at least two adjacent carriers in the K carriers are non-contiguous on a spectrum; or the M data symbols obtained after the DFT belong to K resource blocks of one carrier, and at least two adjacent resource blocks in the K resource blocks are non-contiguous on a spectrum; mapping the M symbols obtained after the DFT to M subcarriers corresponding to inverse fast Fourier transformation IFFT; and performing N-order IFFT on a plurality of mapped symbols.

Abstract: An information transmission method, an apparatus, and a system are disclosed. A first base station may identify, according to indication information, global information and local information in uplink information sent by user equipment. If the indication information indicates that the uplink information includes the global information, the first base station uploads the global information to a core network device. If the indication information indicates that the uplink information includes the local information, the first base station directly delivers the local information to a neighboring base station to cause the neighboring base station to deliver the local information to user equipment in a cell covered by the neighboring base station.

Abstract: A data processing method and a data processing apparatus are provided to reduce a bit error rate of a wireless communications system and improve transmission performance of the wireless communications system. The method includes: mapping L to-be-sent bits to L bit locations included in at least one modulation symbol, where the L to-be-sent bits include at least one bit field, a bit in a bit field having a high priority is preferentially mapped to a bit location that is of the at least one modulation symbol and that has a high reliability level, the at least one bit field is at least one of an information bit field, a first parity bit field, and a second parity bit field; and outputting the at least one modulation symbol.

Abstract: A communication control method is disclosed, including: connecting, by a small cell by using a built-in soft SIM card or an inserted SIM card, to a Uu air interface of a macro cell to access the macro cell; after receiving a broadcast synchronization signal of the macro cell, synchronizing, by the small cell, with the macro cell, and acquiring configuration information of the macro cell; and performing, by the small cell, system configuration for the small cell according to the configuration information of the macro cell. A SIM card is added to the small cell, so that the small cell can access a macro cell in a terminal form, which is equivalent to addition of a Uu air interface between the small cell and the macro cell. Therefore, configuration management, performance optimization, admissible subscriber configuration, and the like are implemented for the small cell by using this air interface.

Abstract: A call processing method, including receiving a first call request of a calling terminal for a called terminal, triggering a mobility management entity to control a base station to page the called terminal, performing call waiting according to a paging response message when receiving the paging response message from the mobility management entity indicating that the called terminal is a power saving state and cannot be paged by the base station, and establishing a session coupling between the calling terminal and the called terminal according to addressing information of the called terminal when receiving, in a call waiting process, the addressing information of the called terminal from the mobility management entity.

Abstract: The present invention discloses a communication method that is based on a visible light source and a transport device. In the solution, before a visible light signal is generated, related information carried in the visible light signal is processed by using orthogonal sequences, and different visible light signals processed by using the orthogonal sequences do not interfere with each other. In this way, even if an optical receiving device receives multiple visible light signals, because the received multiple visible light signals are orthogonal to each other, the visible light signals can be accurately received.

Abstract: A communication control method is disclosed, including: connecting, by a small cell by using a built-in soft SIM card or an inserted SIM card, to a Uu air interface of a macro cell to access the macro cell; after receiving a broadcast synchronization signal of the macro cell, synchronizing, by the small cell, with the macro cell, and acquiring configuration information of the macro cell; and performing, by the small cell, system configuration for the small cell according to the configuration information of the macro cell. A SIM card is added to the small cell, so that the small cell can access a macro cell in a terminal form, which is equivalent to addition of a Uu air interface between the small cell and the macro cell. Therefore, configuration management, performance optimization, admissible subscriber configuration, and the like are implemented for the small cell by using this air interface.

Abstract: A small-cell subscriber management method includes receiving, by a terminal, a closed subscriber group (CSG) identity broadcast by a small cell, determining whether the CSG identity is in a CSG identity list stored by the terminal, sending, by the terminal, an access request to the small cell when the CSG identity is in the CSG identity list, requesting, by the terminal after successfully accessing the small cell, a current CSG subscriber list of the small cell from the small cell, managing, by the terminal after receiving the current CSG subscriber list of the small cell, the current CSG subscriber list of the small cell, where a management includes adding a subscriber to, removing a subscriber from, or changing a subscriber in the current CSG subscriber list. According to the foregoing method, a management terminal is used to manage the CSG subscriber list to implement convenient management of a small cell.