Abstract: A communication method and a related apparatus. The communication method includes determining, based on a starting location of a first remaining minimum system information RMSI detection window and a time index of a synchronization signal (SS)/physical broadcast channel (PBCH) block, a starting location of an RMSI detection window corresponding to a terminal device, where a value of the starting location of the RMSI detection window is one of four possible values of the starting location of the RMSI detection window, and receiving the RMSI based on the starting location of the RMSI detection window.

Abstract: This application discloses a communication method and apparatus. A terminal device determines a frequency position of a random access resource based on at least one of an initial frequency offset, a random access resource configuration period, an uplink channel bandwidth, a bandwidth of the random access resource, a time period of a random access resource, a time period of the random access resource, and a frequency index of the random access resource that are configured by a network device, and the terminal device sends a random access signal to the network device at the determined frequency position.

Abstract: Embodiments of this application provide a communication method and a communication apparatus. According to the method, a terminal device receives configuration information from a network device. The terminal device determines, in a first parameter set based on the configuration information, a parameter corresponding to a random access preamble. The terminal sends the random access preamble to the network device based on the parameter corresponding to the random access preamble and the configuration information.

Abstract: A method and an apparatus for transmitting a random access signal. The method includes receiving configuration information, wherein the configuration information indicates a random access preamble length, a random access signal subcarrier spacing, and a data subcarrier spacing, determining a subcarrier quantity parameter k based on at least one of the random access preamble length, the random access signal subcarrier spacing, or the data subcarrier spacing, generating a random access signal based on the subcarrier quantity parameter k, and sending the random access signal.

Abstract: This application discloses a delay reduction method and apparatus, applied to a random access process. The method includes: sending, by a terminal device, a message 1 to a network device, where the message 1 is a random access preamble; receiving, by the terminal device, a message 2 sent by the network device; and sending, by the terminal device, a message 3 to the network device, where a time gap between receiving the message 2 and sending the message 3 is set by the terminal based on a timing advance (TA) value. In an embodiment, the TA value is related to a message 1 format of the terminal device and a cell radius or subcarrier spacing supported by the message 1. In this solution, a TA value is reduced, and random access efficiency is improved.

Abstract: Embodiments of this application disclose a synchronization signal block determining method and a related apparatus. The method includes: A terminal device detects a first synchronization signal block (SSB); the terminal device determines a second SSB based on the first SSB, where a frequency domain position of the first SSB and a frequency domain position of the second SSB are within a preset bandwidth, or a difference between frequency domain positions of the first SSB and the second SSB is a preset value. The second SSB may be considered as a backup SSB for the first SSB.

Abstract: A message retransmission method and a related apparatus are disclosed. The message retransmission method includes: User equipment sends a message to a network device at a first power using a first spatial filter; and the user equipment retransmits the message to the network device using N second spatial filters, where a second power ramping counter corresponding to a transmit power of each of P second spatial filters is greater than a first power ramping counter corresponding to the first power, and the N second spatial filters include at least one spatial filter different from the first spatial filter. Both N and P are positive integers, and P?N.

Abstract: This application provides a system information redundancy version determining method and apparatus. A communications device determines at least one time-domain resource unit Ux, and determines a redundancy version RVx for system information on the time-domain resource unit Ux according to the time-domain resource unit Ux, where x is an identifier of the time-domain resource unit, the redundancy version RVx satisfies RVx=(Int1(X1/X2*(Int2(x/M) mod K))) mod L, x is a non-negative integer, X1 and X2 are non-zero real numbers, M is a positive real number, K and L are positive integers, mod indicates a modulo operation, Int1 indicates rounding up or rounding down, and Int2 indicates rounding up or rounding down.

Abstract: This application relates to the field of communication technologies, and discloses a communication method and apparatus. On example method includes: a backscatter device receives an excitation signal from an exciter. The backscatter device determines a backscatter signal pattern in a backscatter signal pattern set, where the backscatter signal pattern set includes a plurality of backscatter signal patterns, and backscatter reference signals in the plurality of backscatter signal patterns do not overlap in time domain. The backscatter device modulates a backscatter reference signal and a backscatter data signal on the excitation signal based on the determined backscatter signal pattern, to obtain a backscatter signal. The backscatter device sends the backscatter signal to a receiver.

Abstract: This application provides a method for transmitting a paging message, a terminal device, and a network device. The method includes: determining, by a terminal device, a target paging resource, where the target paging resource includes at least one of the following types of information: position information of a target paging occasion, position information of a target paging frame, and position information of a target monitoring window; and receiving, by the terminal device, a target paging message on the target paging resource, where the target paging message is a paging message sent by a network device to the terminal device. The terminal device and the network device can be used in a communications system applying a beamforming technology, so that the terminal device can receive a paging message sent by the network device to the terminal device.

Abstract: The present disclosure provides a downlink data transmission method, including: using a time-division multiplexing transmission mode in one transmission time interval; sending, by using a wide beam, a control signal to a user served in the current transmission time interval; and grouping users and sending data signals to different user groups by using different narrow beams. In one transmission time interval, time-division multiplexing is used, and a wide beam and a narrow beam are respectively used to transmit a control signal and a data signal. This can avoid a throughput bottleneck resulting from use of a transmission scheme that is based on frequency-division multiplexing only.

Abstract: This application provides a random access method and apparatus. The method includes: receiving, by a terminal, first indication information transmitted by a network device, where the first indication information is used to indicate a random access configuration index; determining, by the terminal, a random access resource based on the random access configuration index; determining, based on an association relationship between the random access resource and a downlink signal, a random access resource corresponding to the downlink signal; and transmitting a random access preamble to the network device based on the random access resource corresponding to the downlink signal.

Abstract: A method includes generating a data signal based on data, scrambling the data signal with a pseudo-random signal thereby generating a scrambled data signal, generating an amplitude shift keying (ASK) signal based on the scrambled data signal, and transmitting, by a transceiver, the ASK signal.

Abstract: This application provides a random access preamble transmission method and an apparatus. In one example method, a terminal receives indication information, and may indicate, with reference to the indication information, whether a first path loss is the same as a second path loss, and determine the first path loss based on the second path loss. Then, the terminal may set, based on a path loss for transmitting a random access preamble between the terminal and a network device, a transmit power for sending the random access preamble.

Abstract: Methods, apparatuses, and storage media for transmitting a system information block are described. In an example implementation, a network device sends indication information to a terminal device. The terminal device determines a period of periodic transmission of a system information block (SIB) based on the received indication information, and receives, based on the period, a SIB1 sent by the network device. Alternatively, the terminal device determines a transmission location of aperiodic transmission of a system transport block based on the indication information, and receives, at the indicated transmission location, a SIB1 sent by the network device.

Abstract: This application provides a system information redundancy version determining method and apparatus. A communications device determines at least one time-domain resource unit Ux, and determines a redundancy version RVx for system information on the time-domain resource unit Ux according to the time-domain resource unit Ux, where x is an identifier of the time-domain resource unit, the redundancy version RVx satisfies RVx=(Int1(X1/X2*(Int2(x/M) mod K))) mod L, x is a non-negative integer, X1 and X2 are non-zero real numbers, M is a positive real number, K and L are positive integers, mod indicates a modulo operation, Int1 indicates rounding up or rounding down, and Intl indicates rounding up or rounding down.

Abstract: This application discloses a communications method and apparatus. The method includes: obtaining, by a terminal device, downlink synchronization signal block index information; receiving, by the terminal device, information used to indicate an association relationship between a random access resource RO and a synchronization signal block; and accessing, by the terminal device, a network device based on the information on an RO corresponding to the synchronization signal block index information. This application further discloses a corresponding apparatus. A time-frequency location of a random access resource associated with each downlink synchronization signal is indicated, so that the terminal device obtains, through downlink synchronization, a time-frequency location for sending an uplink random access signal, to avoid a blind attempt of the terminal device and a beam mismatch of the network device occurring when the network device receives a random access signal, thereby improving efficiency.

Abstract: This application provides a random access method and apparatus. In the method, a terminal device may determine a first random access resource for sending a random access preamble by using reference signal grouping information. This helps the terminal device send the random access preamble to a network device on the first random access resource, thereby improving a random access success rate.

Abstract: This application provides a paging message transmission method and apparatus, where the method includes: receiving, by a terminal device, a physical downlink control channel (PDCCH) from a network device, where one or more types of first indication information, second indication information, a short message, and scheduling information of a paging message are carried on the PDCCH, the first indication information is used to indicate that the PDCCH carries the short message and/or the scheduling information, and the second indication information is used to indicate whether the scheduling information of the paging message is valid and/or whether the terminal device needs to receive a physical downlink shared channel (PDSCH); and obtaining, by the terminal device based on the PDCCH, one or more types of the information carried on the PDCCH.

Abstract: This application provides a signal transmission method and apparatus, a reflector, and a receiver. In one example method, a reflector receives W excitation signals, where W exciters may be configured to carry data and a reference signal that are reflected by the reflector; and the reflector reflects data and L reference signals to a receiver, where the L reference signals are respectively carried in L excitation signals in the W excitation signals, where W and L are both integers greater than or equal to 1, and L is less than or equal to W.