Abstract: This application provides a communication method and apparatus, and relate to the communication field, so that an inter-node negotiation process between an MN and an SN can be completed when the MN uses a CU-DU architecture in DC communication. The method includes: A DU receives a first request message from a CU, where the first request message requests the DU to determine configuration information of an MN, and the configuration information of the MN is used to assist an SN in determining configuration information used for a terminal device; and the DU sends a first response message to the CU, where the first response message includes the configuration information of the MN. Embodiments of this application are applied to a DC scenario.

Abstract: This application provides a communication method and apparatus. Before a source terminal establishes a unicast connection to a first target terminal, the source terminal allocates a first identifier to the first target terminal based on a request of a relay terminal, where a bit length of the first identifier is less than or equal to 8 bits. The source terminal sends first data to the first target terminal, where the first identifier is configured in the first data. The relay terminal forwards the first data to the first target terminal for the source terminal based on the first identifier. In the foregoing solutions, the source terminal may send a message to a specific target terminal based on the first identifier and the bit length of the first identifier is less than or equal to 8 bits.

Abstract: A communication method, a device, and a system, the method including sending, by a terminal device that supports a first user identity and a second user identity, first information to a first access network device using the first user identity, the first access network device being an access network device to which a first cell belongs, where the first cell is a primary cell in which the terminal device communicates with the first access network device by using the first user identity, where the second cell is a cell on which the terminal device camps using the second user identity, and the first indication information indicates that the first user identity and the second user identity that are supported by the terminal device share capabilities of the terminal device, and receiving first configuration information from the first access network device using the first user identity.

Abstract: This application provides a communication method including: A first terminal device receives first indication information sent by a first network device, where the first indication information indicates to release a first sidelink between the first terminal device and a second terminal device, the second terminal device provides a function needed for communication between the first terminal device and the first network device. The first terminal device releases the first sidelink based on the first indication information.

Abstract: A data transmission method, an apparatus, and a system, where the method includes: A network device sends information about a first resource to a first terminal device, where the information about the first resource indicates that the first resource is used to transmit a first service of the first terminal device. The network device sends information about a second resource to a second terminal device, where the information about the second resource indicates that the second resource is used to transmit the first service. The network device receives the first service from the first terminal device via the second terminal device.

Abstract: Embodiments of this application provide a data transmission method, an apparatus, and a system. The method may include: A first device sends information about a transmission resource and first information to a second device, where the transmission resource includes a first resource and a second resource, the first resource is used by the second device to receive a first service from the first device, the second resource is used by a third device to receive the first service from the second device, the first information indicates that the second resource is used to transmit the first service, and the first service is a service of the third device. In this way, it can reduce a data transmission delay, and improve user experience.

Abstract: This application provides a communication method and apparatus, and relates to the field of communication technologies. The method includes: a relay terminal detects that a link fault occurs on a first link, wherein the first link is a link between the relay terminal and a remote terminal; and the relay terminal sends first notification information to the access network device, wherein the first notification information is for notifying the access network device that a link fault occurs on the first link.

Abstract: A terminal device obtains first configuration information, where the first configuration information includes indication information of a UL MAC CE. Then, the terminal device preferentially sends a UL MAC PDU or an SL MAC PDU based on the indication information, where the UL MAC PDU can be used to transmit the UL MAC CE.

Abstract: A communication method includes: a terminal device sends, to a network side device, information indicating that a first user identity of the terminal device and a second user identity of the terminal device are associated with the terminal device; and the terminal device receives, by using the first user identity, paging information corresponding to the second user identity of the terminal device. In the method, the terminal device receives a paging-related message or paging-related information in a cell corresponding to a single user identity, to monitor paging information of a plurality of user identities of the terminal device, so that the plurality of user identities of the terminal device can be effectively paged.

Abstract: This application relates to the field of wireless communication technologies, and provides an information transmission method, an apparatus, and a communication system, to improve communication quality. In the method, a first terminal device receives first indication information from a second terminal device. The first indication information indicates capability information of the second terminal device, and the capability information of the second terminal device. The first terminal device sends second indication information to a network device. The second indication information indicates the capability information of the second terminal device. Based on the foregoing solution, the first terminal device may report the capability information of the second terminal device to the network device by using the second indication information.

Abstract: A communication method and a communication apparatus, the method including receiving first information from a network device, where the first information indicates, to a terminal device, to suspend a secondary cell group (SCG), suspending the SCG based on the first information, and changing a configuration parameter of a master cell group (MCG), where the configuration parameter comprises at least one of an available uplink transmission time period, a maximum transmit power, or a control channel blind detection parameter.

Abstract: Embodiments of this application provides a communication method for releasing a sidelink radio bearer (SLRB), this method can be implemented by a terminal device, the method including: the terminal device obtains an indication, the indication indicates that no Quality of Service (QoS) flow with data that is mapped to a first SLRB; and the terminal device releases the first SLRB.

Abstract: This application provides a communication method, a communication apparatus, and a communication system. The method includes: A first terminal device sends N first signals to a second terminal device on a first beam, where N is a positive integer greater than or equal to 1; the first terminal device determines, based on M measurement results and threshold information, to select a second beam, where the M measurement results are measurement results corresponding to the first beam, the second beam is a beam in at least one candidate beam, and 1?M?N; and when determining that the first beam fails, the first terminal device sends a second signal to the second terminal device on the second beam. According to technical solutions provided in this application, sidelink beam failure recovery can be implemented, and communication reliability can be improved.

Abstract: This application provides failure processing methods, handover methods, terminal devices, and network devices. One method includes receiving a radio resource control (RRC) configuration of a secondary network device, if the RRC configuration of the secondary network device is from the secondary network device and the RRC configuration fails, sending, to a primary network device, first indication information for indicating a configuration failure of the RRC configuration.

Abstract: A communication method, apparatus and storage medium are provided to resolve conflicts between different configurations of a terminal device. A first communication apparatus receives a first message from a network device. The first message includes first configuration information. The first communication apparatus receives or sends a discovery message and performs measurement based on the first configuration information by receiving or sending the discovery message. The measurement is measurement on signal quality of a sidelink between the first communication apparatus and a second communication apparatus. The first communication apparatus sends measurement information of the measurement to the network device.

Abstract: This application provides a communication method and apparatus, to resolve a problem that frequent switching or even data flow interruption may occur when a terminal device performs cell selection or cell reselection. In this application, the terminal device receives first information from a network device, where the first information includes uptilt beam information, and the uptilt beam information indicates that there is an uptilt beam in a cell. The terminal device accesses the cell based on the uptilt beam information.

Abstract: The present disclosure relates to communication methods and network devices. In one example method, a first network device receives a first message sent by a second network device, where the first message is used to notify whether the first network device configures a default data radio bearer (DRB), and the first network device and the second network device are network devices that provide a multi-connectivity service for a same terminal device. The first network device determines, based on the first message, whether to configure the default DRB.

Abstract: Embodiments of this application provide a sidelink management method, an apparatus, and a system. The method includes: A first terminal device repeatedly sends first request information to a second terminal device via a plurality of first to-be-selected beams, where the first request information is used to trigger a connection to the second terminal device; the first terminal device receives first feedback information from the second terminal device via the plurality of first to-be-selected beams, where the first feedback information is used to provide feedback on the first request information; and the first terminal device determines a first beam based on the first feedback information, where the first beam is one of the plurality of first to-be-selected beams. The sidelink management method, the apparatus, and the system can less limit a link establishment distance between terminal devices, and improve a sidelink establishment success rate.

Abstract: Embodiments of this application provide a beam failure recovery method and apparatus, and a system. The method includes: After a beam failure occurs on a first beam on a first carrier, a first terminal device activates resources of candidate beams on the first carrier. The first beam is a beam used for communication between the first terminal device and a second terminal device. The first terminal device communicates with the second terminal device based on a second beam. The second beam is one of the candidate beams. The beam failure recovery method and apparatus, and the system can reduce overheads of a beam failure recovery procedure in a sidelink system.

Abstract: Embodiments of this disclosure relate to a sidelink communication method, including: A first user equipment receives a first message from a second user equipment; the first user equipment determines, based on the first message, a first frequency used to communicate with the second user equipment, where the first user equipment supports at least the first frequency and a second frequency, and the second user equipment supports at least the first frequency; and the first user equipment sends a second message to the second user equipment at the first frequency, where the second message is associated with a unicast connection establishment process or a discovery process. Therefore, the unicast connection establishment process or the discovery process can be performed on a carrier supported by all terminal devices that perform communication, to ensure that the unicast connection establishment process or the discovery process can be correctly performed, improving sidelink communication quality.