Abstract: A session establishment method and apparatus is provided, to resolve a problem that a terminal device cannot establish a plurality of PDU sessions for a same APP based on a URSP. The method includes: A terminal apparatus receives indication information from a first network apparatus, where the indication information is used to indicate that a first application needs to be associated with at least two sessions; and establishes at least one session for the first application based on at least the indication information, so that the first application is associated with at least two sessions.

Abstract: A communication method, apparatus, and system, the method including sending, by a policy control network element, policy control information to a network device, where the policy control information includes a trigger event for reporting transport network information, and where the trigger event triggers the network device to report the transport network information to the policy control network element, receiving, by the policy control network element, the transport network information from the network device, formulating, by the policy control network element, a control policy based on the transport network information, and sending, by the policy control network element, the control policy to the network device.

Abstract: Embodiments of the present application relate to the field of communications technologies, and provide a PCF determining method, an apparatus, and a system. The method includes: receiving, by a first AMF, PCF identification information sent by a second AMF, and obtaining, by the first AMF, policy information from a target PCF when at least one PCF corresponding to the PCF identification information includes the target PCF, where the PCF identification information includes identification information of at least one first PCF, the identification information of the first PCF includes at least one of an IP address of the first PCF, an IP prefix of the first PCF, and an FQDN of the first PCF, the first AMF is an AMF providing a service for the terminal to access a network this time, and the second AMF is an AMF providing a service for the terminal to access a network last time.

Abstract: A method includes obtaining, by a data analytics device, data of a terminal on an access device and data of the terminal on an access and mobility management function device, where the data of the terminal on the access device includes a first identifier, and the access device is an access device, the data of the terminal on the access and mobility management function device includes the first identifier, and the first identifier includes an identifier assigned by the access device to the terminal, associating, by the data analytics device, the data of the terminal on the access device with the data of the terminal on the access and mobility management function device based on the first identifier.

Abstract: This application provides a parameter determining method and a communications entity. The method includes: When a UE is in a system in which an evolved packet system (EPS) network and a 5GS network interwork, the UE is currently located in the 5GS network, and QoS parameters used include an authorized UE aggregate maximum bit rate (AMBR) and an authorized session AMBR of a session. Because of movement of the UE, the UE needs to be handed over to the EPS network, and QoS parameters that need to be used for the UE in the EPS network include an authorized UE AMBR and an authorized access point name (APN) AMBR. The authorized APN AMBR is determined by a first communications entity based on at least one of a subscribed APN AMBR or the authorized session AMBR of the PDU session, and the authorized UE AMBR is determined by a second communications entity based on the authorized APN AMBR.

Abstract: The present disclosure relates to session information management methods. One example method includes sending, by a session management function (SMF) network element, identification information of a terminal device, a data network name (DNN), and slice information to a data management network element to request first subscription data that is of the terminal device and that is associated with the DNN and the slice information, where the slice information is used to identify a network slice served by the SMF network element, and receiving, by the SMF network element, the first subscription data from the data management network element.

Abstract: Embodiments of this application provide a method, an apparatus, and a system for reporting data usage, so that for a PDU session into which a UL CL user plane network element or a BP user plane network element is inserted, statistics can be accurately collected on data usage. The method includes: An aggregate user plane network element determines discarded data usage of the aggregate user plane network element, and sends the discarded data usage to a session management network element. The first session management network element receives the discarded data usage, and receives transport data usage of one or a plurality of anchor user plane network elements, which are anchor user plane network elements connected to the aggregate user plane network element. The first session management network element determines actual data usage of a terminal device based on the discarded data usage and the transport data usage.

Abstract: This application provides a method and an apparatus for invoking an application programming interface API, to determine a target exposing function network element used to invoke an API. The method includes: A first network element obtains routing information of an API, where the routing information is used to indicate a route for invoking the API, and the API is provided by a first exposing function network element and a second exposing function network element; the first network element obtains invocation parameter information of the API, where the invocation parameter information is used to handle the API; and the first network element determines a target exposing function network element in the first exposing function network element and the second exposing function network element based on the routing information and the invocation parameter information.

Abstract: This application discloses a communication method and apparatus. A first mobility management function entity may receive event information from a unified data management function entity, where the event information is used to indicate a first-type terminal event. Therefore, when a terminal apparatus is reachable, the first mobility management function entity may send, based on the event information, a terminal event report to an application function entity that subscribes to the first-type terminal event, thereby improving pertinence of sending the terminal event report.

Abstract: Embodiments of this application provide a data transmission method, with step including receiving, by user equipment, a first message, where the first message is used to instruct the user equipment to activate a reflective quality of service RQ mechanism; generating, by the user equipment, an implicit quality of service implicit QoS rule according to the RQ mechanism; receiving, by the user equipment, a second message, where the second message is used to instruct the user equipment to stop using the RQ mechanism; and stopping, by the user equipment, using the RQ mechanism, and deleting the implicit QoS rule. The user equipment receives the second message indicating that using of the RQ mechanism needs to be stopped, and deletes the implicit QoS rule, so as to implement switching between an explicit QoS rule and the implicit QoS rule, and flexibly configure a QoS rule for uplink data according to a policy of an operator.

Abstract: A method includes obtaining, by a data analytics network element, data of a terminal on an access network element and data of the terminal on an access and mobility management function network element, where the data of the terminal on the access network element includes a first identifier, and the access network element is an access network element, the data of the terminal on the access and mobility management function network element includes the first identifier, and the first identifier includes an identifier assigned by the access network element to the terminal, associating, by the data analytics network element, the data of the terminal on the access network element with the data of the terminal on the access and mobility management function network element based on the first identifier.

Abstract: Embodiments of this application relate to the field of communications technologies, and in particular, to a communication method and a communications apparatus. The solution includes: sending, by a source access network device, a first data packet of a terminal to a target access network device; and when the source access network device determines that the target access network device has received the first data packet, sending, by the source access network device, a first message to the terminal, where the first message is used to indicate the terminal to hand over to the target access network device.

Abstract: A resource information sending method includes determining, by a first network element, a remaining resource of a terminal in a first network, and sending, by the first network element to a first policy control network element, information indicating the remaining resource of the terminal in the first network. The first network is at least one of a first data network or a first network slice. The remaining resource is a subscribed resource currently available to the terminal in the first network. The first policy control network element is a policy control network element configured to provide a service for the terminal in the first network.

Abstract: Example methods and apparatus for obtaining capability information of a terminal are described. One example method includes sending capability information of a terminal by a second policy control network element to a data management network element in advance for storage, so that a first policy control network element may obtain the capability information of the terminal from the data management network element.

Abstract: This application provides a method for controlling disorder of downlink data and an apparatus thereof. The method includes: A control plane network element determines to switch from a first user plane device to a second user plane device, and sends indication information to the second user plane device. The second user plane device buffers, according to the received indication information, downlink data received from a session anchor, and sends the buffered downlink data after reception of an end marker from the first user plane device.

Abstract: Embodiments provide a location area management method, a control node, and user equipment (UE). The method is applied to a communications system including a control plane node, and the control plane node stores an upper-level area identity list of UE. The control plane node determines a lower-level area identity list of the UE based on the upper-level area identity list. The control plane node sends the lower-level area identity list to the UE. When the upper-level area identity list is allocated to the UE, the lower-level area identity list is allocated to the UE. The lower-level area identity list includes fewer areas than the upper-level area identity list, so that when the control plane node pages the UE, paging is performed in an area corresponding to the lower-level area identity list, thereby reducing signaling overheads of a network side device.

Abstract: A method and an apparatus for deleting a session context are provided, to resolve a technical problem of how to delete an SM context from an SMF after abnormal network disconnection. The method includes: receiving, by a session management function entity, a packet data unit PDU session release request; and deleting, by the session management function entity based on the PDU session release request, a PDU session context that is stored in the session management function entity and that is of a terminal, where the PDU session context is a PDU session context that is not deleted after the terminal is abnormally deregistered.

Abstract: A PCF determining method includes receiving, by a first AMF, PCF identification information sent by a second AMF, and obtaining, by the first AMF, policy information from a target PCF when at least one PCF corresponding to the PCF identification information includes the target PCF, where the PCF identification information includes identification information of at least one first PCF, the identification information of the first PCF includes at least one of an IP address of the first PCF, an IP prefix of the first PCF, and an FQDN of the first PCF, the first AMF is an AMF providing a service for the terminal to access a network this time, and the second AMF is an AMF providing a service for the terminal to access a network last time.

Abstract: The present application discloses a discovery method and device, and relates to the field of wireless communications technologies, to resolve a problem that existing two communication parties cannot accurately discover each other, and then it cannot be ensured that the two communication parties perform service communication in a Prose manner. The method provided in the present application includes: sending a discovery message, where the discovery message includes application layer identifier information of a discovery target, and the discovery target is at least one target user or at least one communications group of a first user that uses the first MCPTT UE; and receiving a response message sent by second MCPTT UE, where the response message includes a layer 2 identifier of the second MCPTT UE and an application layer identifier of a user that uses the second MCPTT UE.

Abstract: A method includes obtaining, by a data analytics network element, data of a terminal on an access network element and data of the terminal on an access and mobility management function network element, where the data of the terminal on the access network element includes a first identifier, and the access network element is an access network element, the data of the terminal on the access and mobility management function network element includes the first identifier, and the first identifier includes an identifier assigned by the access network element to the terminal, associating, by the data analytics network element, the data of the terminal on the access network element with the data of the terminal on the access and mobility management function network element based on the first identifier.