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 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 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: This disclosure describes signal transmission methods and apparatus. On example method includes: receiving, by a terminal device, a paging indication sent by a network device, where the paging indication carries information about a plurality of paging groups; and sending, by the terminal device to the network device based on an association relationship between a paged paging group in the plurality of paging groups and a random access preamble, a random access preamble associated with a paging group in which the terminal device is located.

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: A random access method includes determining, by a network device, configuration information and sending the configuration information to a terminal. The configuration information indicates at least a quantity of random access preambles transmitted on one random access resource, a quantity of contention-based random access preambles transmitted on the one random access resource, a quantity of contention-free random access preambles transmitted on the one random access resource, the quantity of random access preambles associated with one downlink signal, the quantity of contention-free random access preambles associated with the one downlink signal, the quantity of contention-based random access preambles associated with the one downlink signal, or a quantity of transmitted downlink signals associated with the one random access resource.

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: 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. 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: This application discloses a paging method and apparatus. The method includes: receiving, by a network device, a random access preamble from a terminal device, where the random access preamble is used to request a paging message; obtaining, by the network device, a paging identifier associated with the random access preamble; and sending, by the network device, a paging message to the terminal device based on the paging identifier.

Abstract: This application provides a random access method, a terminal, and a network device. The random access method includes: determining, by a terminal, whether a resource used for random access conflicts with a resource used for receiving a downlink signal; and if the resource used for the random access conflicts with the resource used for the downlink signal, preferentially using the conflicting random access resource for receiving the downlink signal but not for the random access.

Abstract: This application discloses a signal transmission method. The method may include: obtaining, by a terminal, a first configuration parameter; determining, by the terminal based on the first configuration parameter from random access resources separately associated with a plurality of downlink signals, a random access resource used for random access preamble retransmission; and retransmitting, by the terminal, a random access preamble by using the random access resource used for random access preamble retransmission.

Abstract: A communication method and an apparatus, the method including generating a demodulation reference signal (DMRS) sequence of a broadcast signal according to a pseudo-random sequence c(m), where the DMRS sequence is related to a quantity NRB of resource blocks (RBs) of the broadcast signal and a quantity nRE of resource elements (REs) occupied by the DMRS sequence in one RB, and mapping the DMRS sequence to one or more symbols.

Abstract: This application provides a random access method, a terminal, and a network device. The random access method includes: determining, by a terminal, whether a resource used for random access conflicts with a resource used for receiving a downlink signal; and if the resource used for the random access conflicts with the resource used for the downlink signal, preferentially using the conflicting random access resource for receiving the downlink signal but not for the random access. This avoids a conflict between receiving of the downlink signal and sending of an uplink random access preamble.

Abstract: This application discloses a resource configuration method and an apparatus. The method includes: obtaining, by a terminal device, configuration information, where the configuration information includes at least one piece of the following information: random access resource configuration information and downlink signal parameter information; and accessing, by the terminal device, a network device based on the configuration information. A corresponding apparatus is also disclosed.

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 discloses a random access method; the random access method includes: sending a random access preamble to a network device; receiving a random access response from the network device according to a random access radio network temporary identifier (RA-RNTI); wherein: the RA-RNTI is related to a group index of a random access occasion group to which a random access occasion of the random access preamble belongs. This application further discloses a corresponding random access response method, terminal device, and network device.

Abstract: A random access/responding method and device are provided. In some embodiments, at least two random access preambles can be received before responding to random access of a terminal device, where each of the at least two random access preambles includes at least one sequence. In some embodiments, one random access preamble can be received before responding to random access of a terminal device, where the one random access preamble includes at least two sequences. The sequences in the received random access preambles can be checked. A successfully detected sequence or a random access preamble with the successfully detected sequence can then be responded to. In this way, responding to a plurality of successfully detected random access preambles or a plurality of successfully detected sequences included in one random access preamble is implemented.

Abstract: This application provides a communication method and a communications apparatus. The method includes: determining a system frame number of a radio system frame in which a to-be-sent first broadcast channel PBCH is located, to obtain a first transport block, where the first processing manner is used to indicate some bits of the system frame number of the radio system frame in which the first PBCH is located, and the first MIB includes remaining bits, other than the some bits, of the system frame number of the radio system frame in which the first PBCH is located; and sending, by using the first PBCH, the first transport block in the radio system frame.