Abstract: An embodiment of this application provides a communications method. The method includes: generating, by an first base station, a radio resource control release message on which encryption and integrity protection are performed by using a new key; and sending, by the first base station, the radio resource control release message to a second base station, thereby improving security of communication between the serving device and the terminal and reducing signaling overheads for performing key negotiation over an air interface.

Abstract: Embodiments of this application provide example communication methods and apparatuses. One example method includes receiving, by a first network device, a first request message and uplink data from a terminal, where the first request message is for requesting to resume a suspended radio resource control (RRC) connection. The first network device can then send a second request message to a second network device based on the first request message and the uplink data, where the second network device is a network device previously serving the terminal, and the second request message includes information about the uplink data, where the second request message is for requesting the second network device to release a first data channel between the second network device and a core network device, or the second request message is for requesting the second network device to send a context of the terminal to the first network device.

Abstract: This application discloses a data transmission method and a communication apparatus. The data transmission method includes: The access network device receives a first data packet from a first terminal device, where the first data packet is associated with a terminal group, the terminal group including the first terminal device. The access network device sends the first data packet to a first routing device for forwarding. The first routing device corresponds to the terminal group. The first routing device stores routing information of one or more respective terminal devices of the terminal group. The routing information is for forwarding the first data packet. Signaling overheads can be reduced by using embodiments of this application.

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: Embodiments of this application provide a communication method and a communications apparatus. The method includes: generating a log record, where the log record is recorded by performing MDT log measurement when a terminal is in an inactive state; and when the terminal is in a connected state, sending the generated log record to a network device.

Abstract: Embodiments of the application provide a communications method and apparatus. A target cell is determined based on measurement results of N measured cells and a preset value when there is a first cell satisfying a report trigger condition. A measurement result of the target cell is sent to a base station. A terminal may not only send the measurement result of the cell satisfying the trigger condition to the base station, but also send a measurement result of another cell to the base station. In this way, a quantity of cells that can be selected during determining of handover can be increased, to help the base station select a suitable cell for the terminal.

Abstract: A communication method and an apparatus includes a terminal device that receives a first SSB, determines a PUSCH occasion corresponding to the first SSB, and sends uplink information by using the PUSCH occasion corresponding to the first SSB; and further, the terminal device receives, based on a spatial reception parameter of the first SSB, downlink information sent by a network device.

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: 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, 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: 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: The present disclosure relates to methods and communication apparatus for providing a network slice. In one example method where an access network device accessed by a terminal device does not support a network slice requested by the terminal device, the terminal device sends a network slice identifier, corresponding to a protocol data unit (PDU) session, to the access network device by including the network slice identifier in an radio resource control (RRC) message. The access network device may learn of the network slice identifier, and when the access network device does not support the network slice, search, in an access network device corresponding to a neighboring cell, for a target second access network device that supports the network slice.

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: This application provides a method and an apparatus for configuring minimization of drive-tests MDT. The method for configuring MDT includes: A terminal device receives first MDT measurement configuration information and first indication information from a first network device. The terminal device learns, based on the first indication information, whether a type of first MDT configured by the first network device for the terminal device is signaling based MDT or management based MDT. Further, after establishing a connection to a second network device, the terminal device sends second indication information to the second network device, and reports the type of the first MDT that has been configured for the terminal device. The management based MDT overwrites signaling based MDT previously configured by the first network device for the terminal device can be avoided, thereby increasing a possibility that the management based MDT does not overwrite the configured signaling based MDT.

Abstract: A communication method and an apparatus are provided in embodiments of this application. When a cell served by a DU of an access network device and a neighboring cell use different timing, the DU may obtain timing configurations of a first cell and a second cell, or a RACH configuration that is of a second cell and that is based on timing of a first cell. When the method is applied to a RACH optimization scenario, the DU may determine, at same timing, RACH configurations of the two cells based on the foregoing obtained information, to accurately identify whether a RACH configuration conflict occurs between the cell and the neighboring cell, optimize the RACH configuration of the cell when the conflict occurs, and ensure a success rate and an access latency of random access performed by a terminal device.

Abstract: A handover method and a communication apparatus. A terminal device receives a first message, where the first message includes information about N candidate cells, the N candidate cells include N1 candidate cells and N2 candidate cells, the N1 candidate cells include a cell for which no conditional handover CHO execution condition information is configured, the N2 candidate cells include a cell for which the CHO execution condition information is configured, N and N2 are integers greater than 1 or equal to 1, and N1 is an integer greater than 0 or equal to 0. In a process of attempting to hand over from the source cell to the target cell, the terminal device maintains an RRC connection and/or data transmission with the source cell. Therefore, handover reliability is improved, a handover latency is reduced, and overall system performance is improved.

Abstract: A communication method and a communications apparatus, the method including receiving, by an access and mobility management function (AMF) entity, a first message from a first access network device, where the first message comprises information for indicating to hand over a voice service of a terminal from a packet switched (PS) domain to a circuit switched (CS) domain, the first message further comprises identification information of a target device, and the target device is a second access network device in a 3G network, and sending, by the AMF entity, through a mobility management entity (MME) a request message to a mobile switching center (MSC) entity, where the request message comprises information indicating a source of the first message.

Abstract: In the embodiments of the present invention, UE can complete, by using only two interaction steps instead of six steps in the prior art, a process of sending a data packet to an eNodeB. Even a random access process in the six steps in the prior art includes four interaction steps, and by contrast, in the embodiments, signaling that needs to be consumed on an eNodeB when the UE sends data can be significantly reduced. This is relatively suitable for a scenario in which small data or occasional data is sent.

Abstract: Embodiments of the present invention disclose a measurement method, including: acquiring, by user equipment, a status of using a target unlicensed frequency band by a target radio access technology RAT; and selecting, by the user equipment, a corresponding measurement mode according to the usage status to measure a radio condition of the target unlicensed frequency band. The embodiments of the present invention further disclose user equipment, a network device, and a system.

Abstract: This application discloses a communication system including a master base station and a secondary base station, both connecting with a terminal. In the communication system, the master base station sends a first message to the secondary base station for allocating transmission resources for one or more flows to be transmitted between the secondary base station and a terminal, wherein the first message carries one or both of: identification information of each flow to be transmitted, and information of a data radio bearer (DRB) associated with each flow to be transmitted, then the secondary base station may determine a mapping relationship between a DRB and an admitted flow according to the first message. Moreover, the master base station sends DRB configuration information to the terminal. Therefore, requirements of 5G communication systems for QoS management of information transmission in a dual connectivity scenario can be met.