Abstract: A data transmission method, a device, and a communications system are described. The method includes generating, by a terminal device, first indication information. The first indication information is used to indicate logical channel groups having to-be-sent data and amount of to-be-sent data on part of the logical channel groups having to-be-sent data. The method includes sending, by the terminal device, the first indication information. According to the data transmission method, the device, and the communications system provided in the described embodiments, when a current quantity idle bits in a MAC PDU is insufficient, the terminal device may indicate, to a network device by using the first indication information, the LCGs having to-be-sent data on the terminal device. In this way, uplink transmission resource allocation improved efficiency.

Abstract: This application provides a data transmission method and apparatus, and a system, to reduce outdated information sent by a terminal to a network device, thereby reducing improper scheduling decisions made by the network device. The method includes: sending a first data packet to a network device, and storing the first data packet; receiving a first uplink grant from the network device, and skipping using the first uplink grant to perform uplink transmission; receiving a second uplink grant from the network device, where the second uplink grant is a grant for retransmission and generated due to a failure of transmission on the first uplink grant; and ignoring the second uplink grant, or transmitting a second data packet to the network device based on the second uplink grant.

Abstract: Embodiments of this application provide a random access processing method. A random access preamble and uplink data are sent in an initiation phase of a random access procedure, and the random access procedure is ended in time after feedback information for the uplink data is received. According to technical solutions provided in the embodiments of this application, a terminal side device may send the uplink data when sending the random access preamble in the random access procedure. In addition, the random access procedure can be ended in advance after the feedback information for the uplink data is received.

Abstract: The present invention discloses an uplink transmission method, a base station, and a terminal device, to implement uplink multiuser scheduling and multiuser resource multiplexing, and save resources. The method in embodiments of the present invention includes: obtaining, by a base station, first configuration information and instruction information, where the first configuration information is channel contention configuration information before uplink data is sent, the instruction information is information that instructs a terminal device to send a channel occupancy indication signal, and the channel occupancy indication signal is used to indicate that a current channel belongs to a radio access technology user; and sending, by the base station, the first configuration information and the instruction information to the terminal device, so that the terminal device sends the channel occupancy indication signal based on the first configuration information and the instruction information.

Abstract: Embodiments of the present invention provide a communication method used for random access, including: receiving, by a terminal, random access preamble information sent by a base station; and before sending random access to the base station based on the random access preamble information, receiving, by the terminal, a random access response sent by the base station, where the random access response includes an uplink asynchronous hybrid automatic repeat request HARQ process identifier, and the uplink asynchronous HARQ process identifier is used by the terminal to send uplink data to the base station. Compared with the prior art, the communication method provided in the embodiments of the present invention can ensure to some extent that uplink data is transmitted timely and can effectively improve uplink data transmission reliability.

Abstract: A multimedia broadcast multicast communication method, an apparatus, and a system are provided. The method includes: receiving, by a base station, first indication information at a first time, where the first indication information is used to indicate that transmitting service data in a multimedia broadcast multicast service MBSFN manner is to be suspended; and sending, by the base station, second indication information to user equipment UE according to the first indication information, so that the UE suspends, at a second time according to the second indication information, receiving the service data in the MBSFN manner. The first time is earlier than the second time, and duration between the first time and the second time is less than a multicast control channel MCCH modification period. The user equipment is notified in a more timely manner to suspend transmitting the service data in the MBSFN manner.

Abstract: A data processing method and apparatus are disclosed, and the method includes: determining a radio bearer, RB, to which a first flow is mapped changing from a first RB to a second RB; and sending end indication information. Data packet disorder can be avoided by said method and apparatus.

Abstract: Embodiments provide a user equipment handover method, and a device. In embodiments of the present invention, when a handover is to be performed, user equipment may send first information that is used to request a handover, and then a destination network device may allocate a first uplink resource to the user equipment.

Abstract: Embodiments of the present disclosure provide a data transmission method, user equipment, and an access network device. UE transmits air interface data to an access network device by using a serving cell set including at least two core serving cells that can independently serve the UE to transmit data, and initiates an RRC connection re-establishment process to the access network device only when detecting that all core serving cells in the serving cell set are unavailable. Data transmission is performed by using an available serving cell to the greatest extent. In other words, data transmission can be performed by using any available core serving cell, to reduce the dependence of data transmission between serving cells and minimize possibility of data transmission interruption, thereby improving data transmission robustness.

Abstract: Example data sending methods and apparatus are described. One example method includes sending a first message to a network device by a terminal device. The first message is used to indicate information about remaining time of each of one or more data packets. The remaining time of each of the one or more data packets is used to indicate that the terminal device needs to finish sending each of the one or more data packets before the end of the remaining time. The terminal device obtains information about a resource configured by the network device for the terminal device, wherein the resource is used to send each of the one or more data packets before the end of the remaining time.

Abstract: Embodiments of this application provide a wireless communication method, a terminal, and a network device. In the embodiments of this application, an operation on a wideband that includes a plurality of bandwidth parts can be supported.

Abstract: This application provides a communications method and apparatus. The method includes: obtaining, by a media access control (MAC) entity, M radio link control (RLC) protocol data units PDUs, where M is an integer greater than or equal to 2; and generating, by the MAC entity, N media access control MAC protocol data units (PDUs) based on a logical channel corresponding to each of the M RLC PDUs, where any two RLC PDUs corresponding to a same logical channel and having consecutive RLC sequence numbers are carried in different MAC PDUs, and N is an integer greater than or equal to 2. Consecutive RLC PDUs are placed into different MAC PDUs, so that a continuous packet loss of a same service can be avoided, and transmission reliability can be improved.

Abstract: A random access method includes working, by a user equipment (UE), on a first bandwidth part (BWP), where the first BWP is a currently active BWP, when the UE needs to perform a random access procedure, the UE performs the random access procedure on an initial BWP or on the first BWP, and when the UE receives BWP switching indication information from a network device instructing the UE to use a second BWP when performing the random access procedure on the first BWP, continuing, by the UE, to perform the random access procedure on the first BWP, or stopping, by the UE, performing the random access procedure on the first BWP, and performing the random access procedure on the second BWP.

Abstract: A method includes the following. A first communications device obtains an ith data packet, divides the ith data packet into N data blocks, performs fountain-code encoding on the N data blocks to generate K fountain-code codewords, generates K protocol data units (PDUs) based on the K fountain-code codewords, and sends the K PDUs to a second communications device; and after the first communications device receives first acknowledgement information sent by the second communications device, the first communications device stops, based on the first acknowledgement information, sending a to-be-sent PDU in the K PDUs to the second communications device.

Abstract: A communications method and apparatus. The communications method includes: transmitting a first request to a network device through a first resource, where the first request is used to request beam failure recovery of a first cell or is used to request system information of the first cell, the first resource is a resource of a second cell, and the first cell and the second cell are serving cells of a same terminal; and receiving a first response corresponding to the first request from the network device. Therefore, when a terminal has a plurality of serving cells, the terminal may transmit a request across cells (or across carriers), to improve transmission reliability.

Abstract: This application discloses an information indication method, a terminal device, and a network device. The method includes: determining, by a terminal device, time domain requirement information of data transmission, where the time domain requirement information includes at least one of time adjustment information, jitter time information, time domain resource information, latest sending time information, and remaining duration of the data transmission, the time adjustment information is used to indicate allocation of a resource for the data transmission, the jitter time information is used to indicate a time range in which the data is generated, the time domain resource information is used to indicate a sending time of the data, and the latest sending time information and/or the remaining duration is used to indicate a latest sending time of the data; and sending, by the terminal device, the time domain requirement information to a network device.

Abstract: Embodiments of the present invention provide a communication method used for random access, including: receiving, by a terminal, random access preamble information sent by a base station; and before sending random access to the base station based on the random access preamble information, receiving, by the terminal, a random access response sent by the base station, where the random access response includes an uplink asynchronous hybrid automatic repeat request HARQ process identifier, and the uplink asynchronous HARQ process identifier is used by the terminal to send uplink data to the base station. Compared with the prior art, the communication method provided in the embodiments of the present invention can ensure to some extent that uplink data is transmitted timely and can effectively improve uplink data transmission reliability.

Abstract: Embodiments provide a data transmission method, a device, and a system. The method includes: acquiring, by user equipment, a first preamble corresponding to a cell set of a primary timing advance group of a first base station and a second preamble corresponding to a cell set of a secondary timing advance group of a second base station; sending the first preamble to the first base station, to initiate random access to the first base station according to the first preamble; and sending the second preamble to the second base station, to initiate random access to the second base station according to the second preamble.

Abstract: Embodiments provide a user equipment handover method, and a device. In embodiments of the present invention, when a handover is to be performed, user equipment may send first information that is used to request a handover, and then a destination network device may allocate a first uplink resource to the user equipment.

Abstract: This application provides a data transmission method. In the method, a first access network device and a second access network device establish a data radio bearer (DRB)-based tunnel and a session-based tunnel. The second access network device sends a Packet Data Convergence Protocol (PDCP) layer data packet to the first access network device via the DRB-based tunnel; and the second access network device sends a Service Data Adaptation Protocol (SDAP) layer data packet to the first access network device via the session-based tunnel.