Abstract: The present disclosure relates to radio resource control (RRC) reestablishment methods and apparatuses. In one example method, a terminal device selects a target cell, where the target cell supports an expected network slice. The terminal device sends an RRC reestablishment request message by using the target cell. The expected network slice may include a network slice that the terminal device expects to access, or a network slice corresponding to a PDU session established by the terminal device by using a last serving access network device of the terminal device. The terminal device may select the target cell within a preset time period. For example, the terminal device starts a first timer when the terminal device starts selecting the target cell, and selects the target cell during running of the first timer. The first timer may be specific to one or more network slices or all network slices.

Abstract: A relay device first receives a data packet from a network device through a first link, and sends the data packet to user equipment through a second link. A protocol stack of the relay device consists of a physical layer, a media access control layer, and a segmentation function or a resegmentation function of a radio link control layer; a protocol stack of the relay device consists of a physical layer, a media access control layer, a segmentation function or a resegmentation function of a radio link control layer, and an adaptation layer; or a protocol stack of the relay device consists of a physical layer and a hybrid automatic repeat request function of a media access control layer. The first link is a wireless communication link between the network device and the relay device, and the second link is a wireless direct communication link between the relay device and the user equipment.

Abstract: This application provides a communication method, and a communications apparatus. The communication method includes: An access network device sends a deactivation indication or an activation indication to a terminal. The deactivation indication is used to indicate that a primary secondary cell in a secondary cell group is in a deactivated state, and the activation indication is used to indicate that the primary secondary cell is in an activated state. The access network device is a master node or a secondary node of the terminal. In receiving the deactivation indication or the activation indication, the terminal performs a deactivation operation on the secondary cell group according to the deactivation indication, or activates the secondary cell group according to the activation indication.

Abstract: A communication method and a communication apparatus are provided to send, to a terminal device by using an RRC message, information about at least one first network slice corresponding to a first identifier. The method includes: a first access network device broadcasts a first identifier, where the first identifier identifies information about a first access network slice; and the first access network device sends a radio resource control RRC message to a terminal device, where the RRC message includes information about at least one first network slice corresponding to the first identifier.

Abstract: A context management method includes: when a distributed unit (DU) of a network side device receives a first message from a centralized unit (CU) of the network side device, the DU of the network side device may store a context of the terminal side device in an inactive state. The first message includes a second message, and the second message is used to indicate the terminal side device to enter the inactive state and release a connection to the network side device.

Abstract: This application provide an information update method, and related communications apparatus. In this solution, a first network device determines first information, and sends the first information to a second network device. After receiving the first information, the second network device updates, based on the first information, configuration information corresponding to a first candidate cell to obtain configuration information corresponding to a second candidate cell. The first information is used to update the configuration information corresponding to the first candidate cell to obtain the configuration information corresponding to the second candidate cell, both the first candidate cell and the second candidate cell are managed by the second network device, the first candidate cell includes at least one cell, and the second candidate cell includes at least one cell.

Abstract: A radio access network (RAN) device receives a first message, where the first message includes identifiers of one or more first network slices, and the identifiers of the one or more first network slices are included in a non-access stratum (NAS) request message sent by a terminal device to a core network (CN) device by using the RAN device. The RAN device sends a second message including network slice redirection information to the terminal device, where the network slice redirection information includes at least one of network slice remapping information or terminal device redirection information, and the network slice redirection information is obtained after the RAN device performs network slice redirection decision-making on the one or more first network slices.

Abstract: Embodiments of this application provide example authentication methods. One example method includes receiving, by a radio access network device, authentication request information from a relay device, where the authentication request information includes identity information of the relay device. The identity information of the relay device includes at least one of a temporary identifier or type indication information of the relay device, and the type indication information indicates that the relay device is a network-controlled repeater (NCR). The radio access network device sends an authentication response, where the authentication response includes a result of performing authentication on the relay device.

Abstract: Embodiments of this application provide an MBMS service communication method and a base station, and relate to the communication field. The method includes: A source base station obtains first group identity information of an MBMS service of a terminal device in a neighboring cell; and the source base station sends the first group identity information to the terminal device. In this application, after moving to or accessing the neighboring cell, the terminal device may continue to receive service content and information of the MBMS service based on the first group identity information that is of the MBMS service in the neighboring cell and that is obtained from the source base station.

Abstract: The disclosure provides communication methods and apparatuses. One example method includes that a second communication apparatus establishes at least one tunnel for a first radio bearer, where the at least one tunnel includes a first tunnel. The second communication apparatus sends a first message to a first communication apparatus, where the first message is carried in the first tunnel, the first message includes radio quality information of each of M logical channels, and the M logical channels are associated with the first radio bearer, where M is an integer greater than or equal to 1.

Abstract: Embodiments of this application provide a delay measurement method, a network device, and a terminal device. The method includes network device receiving first information from a core network requesting the network device to measure a transmission delay between the network device and the terminal device. The network device obtains a transmission delay measurement result in response to the first information, and sends second information to the core network within a first preset duration The second information provides an indication of the transmission delay measurement result.

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 an IAB node mobility management method and a related device. If an IAB node encounters an unpermitted area, the method provides a solution in which access of an JAB-MT is allowed but an IAB-DU is not activated. This is conducive to rapid recovery of communication after the IAB node moves out of the unpermitted area while satisfying an unpermitted area constraint. This application can support setting of an unpermitted area that is less than a cell granularity and that is related to a cell, and can also be compatible with setting of an unpermitted area that is greater than or equal to a cell granularity or that is unrelated to a cell.

Abstract: Embodiments of this application relate to the field of communications technologies and disclose a communication method and a device. The method includes: determining an offset based on a first quantity, wherein the first quantity is a quantity of beams that are used to determine signal quality of a first cell; and determining the signal quality of the first cell based on the offset.

Abstract: An artificial intelligence (AI) protocol layer of a first access network device generates an AI parameter, and sends the AI parameter to a terminal device. Then, the first access network device receives, from the terminal device, AI data obtained based on the AI parameter. The AI protocol layer of the first access network device is an upper layer of a radio resource control (RRC) protocol layer of the first access network device, an AI protocol layer of the terminal device is an upper layer of an RRC protocol layer of the terminal device, and the AI parameter indicates the AI data that needs to be obtained and an AI data obtaining manner.

Abstract: A core network element includes a processor, and a non-transitory memory coupled to the processor. The non-transitory memory is configured to store non-transitory instructions, and in response to being executed by the processor, cause the core network element to perform operations including generating, by a first artificial intelligence (AI) protocol layer of the core network element, an AI parameter. The first AI protocol layer of the core network element is an upper layer of a next generation application protocol (NGAP) protocol layer of the core network element. The operations further include sending the AI parameter to a first access network device, and receiving the AI data from the first access network device. The AI parameter is useable for indicating AI data that is to be obtained and an obtaining manner of the AI data.

Abstract: A communication method and apparatus are provided to improve an immersive experience of a user. The method includes: a terminal apparatus receives information from a network device, where the information indicates an air interface status or indicates an amount of data stored by the network device, the terminal apparatus receives data from the network device and processes the data based on the air interface status or the amount of data stored by the network device.

Abstract: A communication method includes receiving, by a terminal device comprising a processor, indication information from a master node. The indication information is used to indicate that a key used for signaling transmission performed between the terminal device and a first secondary node by using a second signaling radio bearer (SRB) is a first key. The first key is used for signaling transmission performed between the terminal device and the master node by using a first SRB. The first secondary node and the master node share one central unit. The communication method also includes determining, by the terminal device, based on the indication information, that the first key is used for signaling transmission performed between the terminal device and the first secondary node by using the second SRB.

Abstract: A communication method and apparatus, the method including receiving configuration information of a serving cell, where the configuration information includes a set of physical downlink control channel (PDCCH) configurations, and the set of PDCCH configurations includes N control resource set-related parameters, where each of the N control resource set-related parameters corresponds to each of N transmission reception points (TRPs), and N is an integer greater than or equal to 2, and communicating with the serving cell based on the configuration information.

Abstract: Embodiments of this application provide a configuration method and apparatus. When indicating, by using an RRC connection release message, a terminal to enter an inactive state from a connected state, a network device may include, in the RRC connection release message, a configuration parameter allocated to the terminal in the inactive state. That is, the terminal receives the radio resource control RRC connection release message sent by the network device, where the RRC connection release message includes first information used to indicate a target configuration parameter. In this way, the terminal may enter the inactive state based on the RRC connection release message, and determine a context parameter of the inactive state based on the first information, so that the configuration parameter is properly allocated to the terminal in the inactive state.