Abstract: Embodiments of this application disclose an information transmission method and apparatus. One example method includes: A master node obtains a conditional primary secondary cell addition/change CPAC configuration set from a stored context of a terminal device, where the CPAC configuration set includes one or more CPAC configurations associated with a secondary cell group SCG failure; and the master node sends the CPAC configuration set to a secondary node.

Abstract: This application discloses a communication method, apparatus, and system. In the method, a terminal device receives first indication information from a first access network device, where the first indication information indicates that the first access network device is currently not connected to a core network device. The terminal device stores a context of the terminal device based on the first indication information after the terminal device accesses the first access network device, so that the terminal device can access a second access network device based on the context of the terminal device after the first access network device stops providing a service for the terminal device. In the foregoing solution, efficiency of accessing an access network device by the terminal device can be improved, so that a delay in setting up a connection to a network side by the terminal device is shortened.

Abstract: This application relates to the communication field, and discloses a communication method and apparatus. Including: A terminal receives first measurement timing configuration information from a network device, where the first measurement timing configuration information is used to configure a first cell list and M offsets corresponding to the first cell list, and the M offsets respectively correspond to M measurement occasions; and the terminal measures an SSB of each cell in the first cell list on the M measurement occasions, where the M measurement occasions include a first measurement occasion, and a first offset corresponding to the first measurement occasion is a time interval between a time domain start position of the first measurement occasion and a time domain start position of a measurement periodicity. In this way, duration for measuring the SSB by the terminal can be effectively reduced, and power consumption of the terminal can be reduced.

Abstract: Embodiments of this application provide a configuration method and an apparatus. The method includes: A source master node sends a CHO request message and receives a CHO request response message, where the CHO request response message includes information about a candidate primary secondary cell provided for a first candidate master node and RRC configuration information of the first candidate master node. The source master node determines CPAC configuration information based on the information about the candidate primary secondary cell and the RRC configuration information of the first candidate master node. The source master node sends the CPAC configuration information to a terminal device. According to the configuration method and the apparatus in this application, the CPAC configuration information is coordinated and consistent with measurement configuration information determined by the source master node, and efficiency of completing a CPAC by the terminal device is improved.

Abstract: The present disclosure relates to communication methods and communications apparatus. In one example communication method, a terminal device obtains measurement configuration information, where the measurement configuration information is used to indicate a target frequency for which logged minimization of drive tests (logged MDT) measurement is performed by the terminal device. The terminal device performs the logged MDT measurement for the target frequency.

Abstract: A communication method and apparatus are provided, to resolve a problem that a terminal device may fail to normally communicate with a network side when an SCG is suspended and a link problem occurs in an MCG or a signal quality of the MCG deteriorates, so that communication reliability is improved. The communication method and the apparatus are applicable to a communication system of any dual connectivity architecture, such as EN-DC, NGEN-DC, NE-DC and NR-DC. The method includes: When detecting that a link problem occurs in an MCG or signal quality of the MCG is less than a signal quality threshold, a terminal device resumes a suspended SCG, to resume communication between the terminal device and a network side. The MCG is managed by a master node, and the SCG is managed by a secondary node.

Abstract: Embodiments of this application provide a communication method and a communication apparatus. The method includes: receiving first information from a network device, where the first information includes assistance information used to determine a reference point of a first cell, and a terminal device is located in the first cell; predicting a distance between the terminal device and the reference point in a first time period based on the assistance information and location information of the terminal device; and determining, based on threshold information and the predicted distance, whether to perform cell measurement. A condition is set for performing cell measurement, to avoid invalid cell measurement, and reduce energy consumption of the terminal device.

Abstract: This application provides a measurement configuration method, an access network device, and a terminal device, and provides a specific method for QoE measurement on a multicast service, so that a network side optimizes a network based on a QoE measurement result of the multicast service. The method includes: obtaining quality of experience QoE measurement configuration information of a first multicast service and first information, where the first information is related to QoE measurement on a unicast service, and the first multicast service corresponds to the unicast service; determining application layer measurement configuration information of the first multicast service based on the QoE measurement configuration information of the first multicast service and the first information; and sending the application layer measurement configuration information to a first terminal device.

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: A measurement configuration method and a communication apparatus are provided, includes: A source master node sends a CHO request to one or more candidate master nodes, receives a CHO request response which includes a CHO configuration, a first CPAC configuration, and a to-be-measured frequency of a candidate secondary node sent by a first candidate master node, and sends a first RRC configuration message which includes the CHO configuration, a second CPAC configuration, and a measurement configuration to a terminal device. The measurement configuration includes a measurement object and a first measurement gap configuration. The measurement object includes a to-be-measured frequency of the source master node, a to-be-measured frequency of the first candidate master node, a to-be-measured frequency of a source secondary node, and the to-be-measured frequency of the candidate secondary node. Thus the terminal device access a more proper primary cell and a more proper primary secondary cell.

Abstract: In accordance with an embodiment, a method includes: receiving first indication information from a first access network device, wherein the first indication information indicates that a minimization of drive-tests measurement and an application layer measurement are to be associated; and sending second indication information to a second access network device, wherein the second indication information is used to request to associate the minimization of drive-tests measurement and the application layer measurement.

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: This application provides a communication method and a communication apparatus. In the method, after a DU sends a first handover message to a terminal device, the DU receives a second handover message from a CU, where the first handover message indicates to hand over the terminal device from a source cell to a first target cell in a first manner, the first manner includes an L1 and/or L2-based cell handover manner, the second handover message indicates to hand over the terminal device from the source cell to a second target cell in a second manner, and the second manner includes an L3-based cell handover manner. The DU determines that a cell handover manner of the terminal device is the first manner or the second manner.

Abstract: In a communication method, a first access network device sends first indication information to a measurement collection entity. The first indication information indicates that an application layer measurement result from a terminal device is associated with a radio side measurement result of the first access network device, or the application layer measurement result is associated with a radio side measurement result of a second access network device. The terminal device is separately connected to the first access network device and the second access network device.

Abstract: An access method and a communication apparatus are provided. The method includes: A terminal device receives first indication information from a first network device, receives access indication information from a second network device, and initiates access to a target cell of the second network device based on the access indication information. The first indication information indicates the terminal device to initiate the access to the target cell of the second network device based on the access indication information from the second network device. After being indicated to receive the access indication information from the second network device, the terminal device initiates the access to the target cell of the second network device.

Abstract: A history information recording method, including obtaining, by a current secondary node, information about a history cell that a terminal device visits, where the information about the history cell comprises at least one of stay time of the terminal device in the history or moving speed information of the terminal device in the history cell, and performing, by the current secondary node, handover preparation based on the information about the history cell.

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: This application provides a communication method and apparatus, so that a terminal device reports an RLF report related to whether link recovery for an MCG succeeds. The terminal device separately communicates with a first network device and a second network device, where the first network device manages a first MCG, the second network device manages a first SCG, and an MCG link recovery function is configured for the first SCG. After determining that a radio link failure RLF occurs in the first MCG, the terminal device sends a first RLF report to a third network device, where the first RLF report is related to whether link recovery for the first MCG succeeds.

Abstract: A method includes receiving a first message from a first master node. The first message includes an identifier of a first candidate primary secondary cell (PSCell) or an identifier of first configuration information of the first candidate PSCell. The first candidate PSCell is included in both a first PSCell list and a second PSCell list. Alternatively, the first message includes delta configuration information of a second candidate PSCell in the second PSCell list. The first configuration information of the first candidate PSCell includes an addition/change condition and a configuration of the first candidate PSCell. The first PSCell list includes one or more candidate PSCells configured by the first master node for a terminal. The second PSCell list includes one or more candidate PSCells configured by a second master node for the terminal. The method also includes adding a target PSCell or changing from an original PSCell to the target PSCell.

Abstract: A data packet processing method and an apparatus. The method includes: a first device determines a first HARQ process from an available HARQ process range of a first DRB or a first logical channel; obtains a first data packet corresponding to the first DRB or the first logical channel, where the first data packet does not carry a logical channel identifier, so that overheads of the data packet can be reduced; and sends the first data packet to a second device through the first HARQ process. The second device determines the available HARQ process range, receives the first data packet from the first device through the first HARQ process, and can quickly and accurately determine, based on the first HARQ process for receiving the first data packet, a logical channel identifier corresponding to the first data packet.