Abstract: This application provides a communication mode switching method and a related apparatus. The method may include: A first terminal device sends a first message to a second terminal device, where the first message is used to request to switch at least one service between the first terminal device and the second terminal device from a PC5 interface communication mode to a Uu interface communication mode; and after receiving the first message of the first terminal device, the second terminal device sends a second message to the first terminal device, to notify that some or all of the at least one service are allowed to be switched from the PC5 interface communication mode to the Uu communication mode. According to the method, switching of one or more services from the PC5 interface communication mode to the Uu interface communication mode can be completed through negotiation between terminal devices.

Abstract: This application relates to the field of wireless communications technologies, and provides a communication method, including: receiving, by a mobility management network element, first information from a terminal device; obtaining a user equipment context of the terminal device in a public network and a user equipment context of the terminal device in a private network based on the first information; and using the user equipment context of the terminal device in the public network and the user equipment context of the terminal device in the private network as a user equipment context of the terminal device. According to the solution provided in embodiments, the user equipment context of the terminal device includes the user equipment context in the public network and the user equipment context in the private network, so that the terminal device can access both the public network and the private network, thereby improving user experience.

Abstract: A method includes obtaining at least one of application context relocation (ACR) capability information supported by an edge application server (EAS), ACR capability information supported by an edge enabler client (EEC), ACR capability information supported by an application client (AC), or ACR capability information supported by an edge enabler server (EES). The method also includes selecting ACR mode information for the AC based on the at least one of the ACR capability information supported by the EAS, the ACR capability information supported by the EEC, the ACR capability information supported by the AC, or the ACR capability information supported by the EES. The ACR mode information indicates an identifier indicating the AC and an ACR scenario selected for the AC.

Abstract: A method for providing a restricted service and a communications device, where the method includes: receiving, by a policy control function (PCF), an identifier of a terminal and indication information, where the indication information is used to indicate that the terminal is in a state of exception or indicate an exception type of the terminal; and sending, by the PCF, the identifier of the terminal and a first restricted service policy according to the indication information, where the first restricted service policy is used to provide a restricted service for the terminal.

Abstract: Isolated power supply control circuits, isolated power supply and control method thereof are disclosed, the control circuit for controlling an isolated power supply includes a secondary-side control signal generator and a primary-side control signal generator. The secondary-side control signal generator produces a secondary-side transistor switch control signal containing information about a turn-off instant of a secondary-side synchronous rectification transistor, which serves as a second turn-on instant. The primary-side control signal generator derives, from a feedback signal, a supposed turn-on instant for a primary-side transistor switch, which serves as a first turn-on instant. The primary side turn-on signal generator further derives a turn-on instant for the primary-side transistor switch from the second or first turn-on instant whichever is later and responsively generates a primary-side transistor switch control signal.

Abstract: A communication method and a communications apparatus are disclosed. The method is performed by a control plane function entity and includes: obtaining a correspondence between address information of a user plane function entity and a user plane capability supported by the user plane function entity; receiving a request message from an application server, where the request message is used to request to establish a session for a first service and includes service information of the first service, and the service information includes at least one of broadcast area information and service type information; determining address information of a target user plane function entity based on the correspondence and the service information; and establishing a session connection to the target user plane function entity based on the address information.

Abstract: This application discloses a communication method and a communications apparatus, to resolve problems of a long transmission path and a large transmission delay of signaling that are caused because a data network (DN) to which application layer control signaling used to control path switching needs to be transmitted for processing in a process of the path switching is outside a mobile communications network. The method includes receiving, by a first core network device, a request message from a terminal, where the request message is used to request to switch from a multicast mode to a unicast mode to transmit service data to be sent to the terminal. The method further includes indicating, by the first core network device based on the request message, a multicast user plane gateway and/or a service server corresponding to the terminal to send, to the terminal in the unicast mode, the service data to be sent to the terminal.

Abstract: A display device and a video communication data processing method are disclosed. The method comprises: in response to an instruction for video communication with at least one peer device, a controller collecting a global image of a local device by means of an image acquisition device; and presenting a local preview window in a user interface, and displaying, in the local preview window, a video image of the local device according to the global image, wherein when there is a moving target in the global image, the video image of the local device is a partial image corresponding to a target stable area of the moving target.

Abstract: Embodiments of this application disclose a communication method and device, and relate to the communications field, to efficiently deliver a vehicle-to-everything (V2X) message by using limited bandwidth resources of PC5. The method includes: receiving, by a first node, PC5 broadcast reference information from a second node, where the PC5 broadcast reference information is used to indicate to send target data from the second node in a PC5 interface broadcast mode; and sending, by the first node, the target data in the PC5 interface broadcast mode based on the PC5 broadcast reference information.

Abstract: An address obtaining method includes obtaining, by a third network device, an identifier of a first application from a terminal device. The identifier of the first application indicates a request for obtaining an address of an instance of the first application. The address obtaining method further includes sending, by the third network device, a first message to a first network device, wherein the first message comprises the identifier of the first application, and the first message is useable to request the address of the instance of the first application. The address obtaining method further includes receiving, by the third network device, the address of the instance of the first application from the first network device, and sending the address of the instance of the first application to the terminal device.

Abstract: This application provides a context transfer method and a communication apparatus. The method includes: When an edge enabler client context fails to be relocated from a second edge enabler server to a first edge enabler server, a first apparatus sends first information to a first edge application server corresponding to the first edge enabler server, where the first information is used by the first edge application server to subscribe to edge enabler server capability exposure information from the first edge enabler server. In the foregoing technical solution, when an edge enabler client context fails to be transferred, the first apparatus may indicate a target edge application server to subscribe to edge enabler server capability exposure information from a target edge enabler server.

Abstract: A wireless communication method and a communication device. The method includes: a first management device receives a communication coverage request message from a second management device, where the communication coverage request message includes at least one of the following communication parameter information: communication coverage area information and communication service requirement information; the first management device determines at least one target access network based on the communication parameter information; and the first management device sends a first configuration message to the target access network, where the first configuration message is used to indicate the target access network to provide communication coverage. This can reduce a waste of energy and resources.

Abstract: A method for providing a restricted service and a communications device, where the method includes: receiving, by a policy control function (PCF), an identifier of a terminal and indication information, where the indication information is used to indicate that the terminal is in a state of exception or indicate an exception type of the terminal; and sending, by the PCF, the identifier of the terminal and a first restricted service policy according to the indication information, where the first restricted service policy is used to provide a restricted service for the terminal.

Abstract: The present disclosure relates to communications methods and apparatus. In one example method, a terminal device generates a first message. The first message is used to request to establish a protocol data unit (PDU) session home-routed to a first network. The terminal device sends the first message to a first access and mobility management function (AMF) entity. The first AMF entity is a network element in a second network.

Abstract: This application relates to the field of communication technologies, and provides a communication method and apparatus. In the method, a multicast session management function network element receives a PCC rule corresponding to a first multicast group from a policy control function network element; obtains, based on the PCC rule, a target multicast QoS parameter corresponding to the first multicast group and used for configuring a QoS parameter corresponding to the first multicast group; and sends the target multicast QoS parameter to an access network device, so that the access network device obtains the target multicast QoS parameter, and configures, based on the target multicast QoS parameter, the QoS parameter corresponding to the first multicast group. In this way, a multicast QoS parameter is configured.

Abstract: The present invention provides a data processing method, a node, a structure, and an apparatus. The method includes: receiving, by an aggregation node, a first non-access stratum message sent by user equipment UE, where the aggregation node includes at least two types of interfaces, and each type of interface is used to receive a first non-access stratum message of one radio access technology RAT type; converting, by the aggregation node, the first non-access stratum message into a non-access stratum message in a first format based on a RAT type of the first non-access stratum message, where the first format is a non-access stratum message transmission format supported between the aggregation node and a core-network control plane entity; and sending, by the aggregation node, the non-access stratum message in the first format to the core-network control plane entity.

Abstract: This disclosure provides a communication method, apparatus, and system. The method is performed by a remote terminal, which receives first policy information from a policy control function network element, where the first policy information includes a relay mode corresponding to a first application of the remote terminal, determines a first relay mode based on the first policy information, and transmits data of the first application in the first relay mode to a relay device. In the method, the remote terminal selects a relay mode for individual application and deliver data of the individual application in the selected relay mode such that different relay modes can be applied to different applications. In this way, requirements of different applications are met, and collaboration between different relay modes is enabled.

Abstract: Embodiments of this application disclose a communication method of adding a terminal to a multicast group by using a unicast PDU session establishment procedure. The terminal sends, to a mobility management network element, a PDU session establishment request message that includes identification information of a multicast group, where the PDU session establishment request message is used by the terminal to join the multicast group. The mobility management network element receives the PDU session establishment request message, sends the identification information of the multicast group to a session management network element, triggers the session management network element to establish a multicast PDU session, and feeds back the context information of the multicast PDU session to the terminal to allow the terminal to join the multicast group so that the terminal receives multicast data by using the multicast PDU session.

Abstract: This disclosure provides a multicast service transmission method and apparatus, to avoid a resource waste and help save resources. The method is applied to a scenario in which a terminal device moves from a source access network device to a target access network device. The method includes: obtaining multicast capability information of the target access network device; and sending information about a multicast session to the target access network device when the multicast capability information indicates that the target access network device supports multicast, where the information about the multicast session is used for allocating a transmission resource to the multicast session, and the multicast session is used for transmitting data of a multicast service corresponding to the terminal device.

Abstract: This application provides a context management method and apparatus, to resolve a problem that contexts of a large quantity of terminals occupy a large amount of storage space of an AMF entity. The method includes: when a first core network device has stored group information corresponding to a terminal, establishing, by the first core network device, a correspondence between the terminal and the group information. This application relates to the field of communications technologies.