Abstract: A method includes receiving, by a session management function (SMF), first information from an access and mobility management function (AMF), obtaining, by the SMF, protocol data unit (PDU) session management subscription information from a unified data management (UDM) module, and when dynamic policy and charging control (PCC) is not deployed, establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session.

Abstract: Embodiment of this application provides a subscription change processing method, a first session management network element receives first indication information, where the first indication information indicates that a plurality of sessions of a terminal device need to be managed by using a same session management network element, the plurality of sessions are a plurality of sessions that each have: a first DNN and first S-NSSAI, and the first session management network element is one of a plurality of session management network elements corresponding to the plurality of sessions. The first session management network element sends a session release notification to the terminal device, where the session release notification carries a first session identifier and second indication information, the second indication information indicates to re-establish a first session corresponding to the first session identifier, and the first session is a session that has: the first DNN and the first S-NSSAI.

Abstract: Embodiments of this application disclose a method for managing QoS, a relay terminal, a PCF network element, an SMF network element, and a remote terminal. The method includes: A relay terminal obtains QoS information from a network device, where the QoS information includes first QoS information and/or second QoS information, the first QoS information is used to transmit data of a remote terminal between the remote terminal and the relay terminal, and the second QoS information is used to transmit the data of the remote terminal between the relay terminal and a UPF network element; and the relay terminal sends the first QoS information to the remote terminal based on the QoS information. According to embodiments of this application, QoS from the remote terminal to a network side can be properly managed, and a requirement on service transmission from the remote terminal to the network side is ensured.

Abstract: Embodiments of this application provide an uplink PDR generation method, an apparatus, and a system, to resolve a problem in a conventional technology that an uplink data packet may be discarded because a PCF network element may not include uplink SDF information when generating a PCC rule including an RQC indication. The method includes: A session management network element receives a first policy and charging control PCC rule from a policy control network element, where the first PCC rule includes downlink service data flow SDF information that corresponds to a first service. When the first PCC rule includes a reflective quality of service control RQC indication, the session management network element generates, according to the first PCC rule, a first uplink PDR that corresponds to the first service. The session management network element sends, to a user plane network element, the first uplink PDR that corresponds to the first service.

Abstract: This application discloses a multicast session establishment method and a network device, and relates to the field of wireless communication technologies, to implement establishment of a multicast session based on a network architecture that has been deployed by an operator. In one example, when the multicast session is established, policy control, for example, quality of service QoS control, of the multicast session may be completed via a policy control network element or a session management network element in the network architecture that has been deployed by the operator.

Abstract: In a communication method, the method includes: receiving a first AMBR of a slice, where the first AMBR indicates a quantity of GBR resources and a quantity of non-GBR resources in the slice, and the first AMBR is a subscribed slice AMBR or an authorized slice AMBR; determining a second AMBR of the slice based on the first AMBR, a session-AMBR of an activated PDU session of the slice, and a flow control bit rate of a QoS flow of the activated PDU session of the slice, where the flow control bit rate is a GFBR or an MFBR; and performing traffic control on the slice based on the second AMBR. The AMBR of the slice may indicate a quantity of GBR resources and a quantity of non-GBR resources in the slice.

Abstract: The present disclosure relates to quality of service (QoS) information notification methods, devices, and systems. In one example method, a user plane network element obtains a first QoS notification, where the first QoS notification includes first QoS information used to indicate QoS of a target service. The user plane network element sends first indication information to an application network element to which a QoS notification needs to be reported, where the first indication information is used to indicate a second QoS notification, the second QoS notification includes second QoS information of the target service, and the first QoS notification is the same as the second QoS notification, or the second QoS notification is determined based on the first QoS notification.

Abstract: Disclosed is an AMBR control method, device, and system, so that a quality of service (QoS) control mechanism can be used to control use of resources in a network slice by a terminal device. The method includes: a mobility management network element obtaining M pieces of single network slice selection assistance information (S-NSSAI) corresponding to a terminal device and a first slice-AMBR corresponding to each piece of S-NSSAI in the M pieces of S-NSSAI; and sending the M pieces of S-NSSAI and the first slice-AMBR corresponding to each piece of S-NSSAI to an access network device, where the first slice-AMBR corresponding to each piece of S-NSSAI is used to determine a second slice-AMBR corresponding to the S-NSSAI, and the second slice-AMBR corresponding to each piece of S-NSSAI is used to control an aggregate bit rate of non-guaranteed bit rate non-GBR QoS flows in a network slice indicated by the S-NSSAI.

Abstract: The present disclosure relates to user plane information reporting methods and apparatus. In one example method, a session management network element obtains parameter information, and initiates establishment of a dedicated tunnel between a first communications apparatus and a second communications apparatus, where the parameter information indicates the first communications apparatus to report user plane information when a reporting condition is met. The session management network element sends a first rule to the first communications apparatus, where the first rule indicates the first communications apparatus to send a packet to the second communications apparatus through the dedicated tunnel when the reporting condition is met.

Abstract: Embodiments of this application provide a policy control function network element selection method, an apparatus, a system, and a storage medium The method includes: A first access and mobility management function network element receives a registration request message of the terminal device; obtains, based on an identifier of the terminal device in the registration request message, an identifier of a policy control function network element currently serving the terminal device and a network identifier of the policy control function network element; and when a network identifier of the first access and mobility management function network element is consistent with the network identifier of the policy control function network element, determines that the policy control function network element is a target policy control function network element.

Abstract: In an access and mobility management policy association termination method, a first access and mobility management function apparatus sends first policy control function identifier information of a first policy control function apparatus to a second access and mobility management function apparatus, and sends first deletion request information to the first policy control function apparatus. The first deletion request information is for requesting the first policy control function apparatus to delete an access and mobility management (AM) policy association between the first policy control function apparatus and the first access and mobility management function apparatus for a terminal device. Both the first access and mobility management function apparatus and the first policy control function apparatus then delete AM policy control information for the terminal device.

Abstract: This application provides an MDBV determining method, apparatus, and system. The method includes: A first device determines an updated MDBV based on an updated segment packet delay budget, so that an access network device can use the updated MDBV. Therefore, according to an actual requirement of the access network device, a corresponding MDBV is generated for use. This helps ensure communication efficiency of the access network device.

Abstract: This specification discloses a communication method, and a system. The method includes: receiving, by a first control network element, analysis information of a network data analytics network element NWDA, and generating a policy based on the analysis information; sending, by the first control network element, the policy to a second control network element, where execution of the policy is controlled by the second control network element; receiving, by the first control network element, an execution result of the policy that is sent by the second control network element, and determining, based on the execution result, whether the analysis information is invalid; and sending, by the first control network element, an invalidity notification message to the NWDA when the first control network element determines that the analysis information is invalid, where the invalidity notification message is used to instruct the NWDA to generate new analysis information.

Abstract: A packet delay parameter obtaining method, apparatus, and system are provided. The method provides a session management network element determines whether a first QoS flow satisfying a parameter condition exists, where the first parameter indicates information corresponding to a PSA UPF transmitting the first QoS flow, the first parameter indicating information corresponding to a PSA UPF transmitting the first service flow. If no first QoS flow satisfying the parameter condition exists, a second QoS flow for the first service flow is established, and the session management network element sends a first message to an access network element, the first message including identification information of the second QoS flow and a packet delay parameter corresponding to the second QoS flow.

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: 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 service continuity implementation method, an apparatus, and a system, to ensure service continuity in an application layer data packet transmission process. The method includes: receiving, by a session management network element, first survival time information from a policy control network element, where the first survival time information indicates duration of a service that survives when a correct data packet is not received; determining, by the session management network element, the first survival time information as a binding parameter of a quality of service QoS flow; and sending, by the session management network element, second survival time information to an access network device, where the second survival time information is used to indicate the duration; and after receiving the second survival time information from the session management network element, scheduling, by the access network device, a data packet based on the second survival time formation.

Abstract: This application provide a method, a device, and a system. The method performed by a session management network element includes: receiving, by the session management network element, a first policy and charging control (PCC) rule from a policy control network element, wherein the first PCC rule comprises indication information, and the indication information indicates that a service corresponding to the first PCC rule is a time sensitive service; and binding, by the session management network element, the first PCC rule to a quality of service (QoS) flow, wherein no other PCC rule is bound to the QoS flow.