Abstract: When an EBI needs to be assigned to an EPS bearer to which a QoS flow is mapped in an EPS, whether user plane security enforcement information of a PDU session matches user plane encryption protection information of the EPS is determined, that is, whether a user plane capability of the EPS can meet a user plane security requirement of the PDU session is determined. The EBI is assigned to the EPS bearer only when the requirement is met. Otherwise, the EBI is not assigned to the EPS bearer or the EBI is released if the EBI has been assigned. In this way, when UE moves from a 5GS to the EPS, the EPS bearer is prevented from using an EBI that does not meet the user plane security requirement for data transmission.

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: 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: A wireless communication method includes: A mobility management network element receives a handover request from a source access network device, where the handover request includes an identifier of a first session, the first session corresponds to a first network slice, and the first session is used to transmit a data packet of a first application; when determining that a target access network device does not support the first network slice, determines a second network slice supported by the target access network device; and triggers the target access network device to transmit the data packet of the first application through the second network slice.

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: 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.

Abstract: A cell selection method includes obtaining measurement results of N cells. The cell selection method also includes obtaining cell selection assistance information. The cell selection assistance information includes identifiers of L slices corresponding to M sessions of a terminal device and slice capability information of the N cells, the slice capability information of the N cells includes identifiers of slices supported by the N cells, and M, L, and N are positive integers. The cell selection method further includes performing cell selection or cell reselection based on the measurement results of the N cells and the cell selection assistance information.

Abstract: This application provides a cache decision method and apparatus. The method includes: receiving, by a policy control function PCF, first cache information sent by at least one local analytic function LAF. The first cache information includes a base station identifier, identifiers of first N1 pieces of application information that are accessed for a maximum quantity of times, and content corresponding to the identifiers of the N1 pieces of application information, where N1 is a positive integer. The method further includes determining, by the PCF, local cache content based on the first cache information and a capacity of a local cache. In this way, the cache hit rate can be effectively improved, transmission bandwidth and data transmission overheads can be greatly reduced, and users' experience improved.

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: In a communication method, a first access network device sends first information to a second access network device, where the first information is used to indicate that the first access network device has notified a core network device that a quality of service requirement of at least one quality of service flow cannot be met; the second access network device may send second information to the core network device, where the second information is used to notify the core network device that a quality of service requirement of a first quality of service flow in the at least one quality of service flow can be met, and the first quality of service flow is a quality of service flow that has been handed over from the first access network device to the second access network device.

Abstract: In a method for configuring a policy for user equipment (UE), a PCF network element receives policy information of the UE from a first network element. The policy information of the UE indicates a current policy of the UE. The PCF network element sends configuration information to the UE based on the policy information of the UE, and the configuration information instructs the UE to update the policy of the UE. The policy control function network apparatus then sends to the first network apparatus update information that comprises either the configuration information or an identifier of the configuration information.

Abstract: A communication method and a communications apparatus are provided, to verify a user equipment route selection policy (URSP) used by a terminal apparatus. The communication method includes: obtaining information about a first application of at least one packet data unit (PDU) session, where the information about the first application is determined based on a first URSP; and sending the information about the first application to a. second network element, where the information about the first application is used to verify whether information about a second application of the at least one PDU session matches the information about the first application, and the information about the second application is information about an application to which a data packet in the at least one PDU session belongs.

Abstract: Communication methods and an apparatus are provided. The method includes: After receiving a registration request sent by a terminal device, an AMF sends first information to a UDM network element, where the first information includes NSSAI requested by the terminal device, S-NSSAI in a home domain corresponding to the NSSAI requested by the terminal device, or subscribed S-NSSAI of the terminal device. The AMF receives SoR information of the terminal device from the UDM, where the SoR information includes information about each preferred PLMN of the terminal device. The AMF sends the SoR information to the terminal device. Based on this solution, when determining the SoR information of the terminal device, the UDM may determine each preferred PLMN of the terminal device based on a network slice expected (requested) by the terminal device.

Abstract: A communication method, apparatus and system are provided. The method includes: A first network element receives, from an application function network element, a first request for requesting to obtain information about a first policy control network element, where the first policy control network element is a policy control network element that provides mobility management. The first network element sends the information about the first policy control network element to the application function network element. Based on this solution, the application function network element obtains the information about the first policy control network element from the first network element, and the application function network element may further send input information to the first policy control network element, so that the first policy control network element can select, based on the input information, an AM policy that matches a requirement of a currently running application.

Abstract: In a communication method, a first access network device sends first information to a second access network device, where the first information is used to indicate that the first access network device has notified a core network device that a quality of service requirement of at least one quality of service flow cannot be met; the second access network device may send second information to the core network device, where the second information is used to notify the core network device that a quality of service requirement of a first quality of service flow in the at least one quality of service flow can be met, and the first quality of service flow is a quality of service flow that has been handed over from the first access network device to the second access network device.

Abstract: A communication method includes obtaining, by a policy control network element, an application identifier. The communication method further includes determining, by the policy control network element, a first application descriptor based on the application identifier. The communication method further includes sending, by the policy control network element, the first application descriptor to a session management network element. The first application descriptor is useable for generating an access traffic steering, switching, and splitting (ATSSS) rule. The ATSSS rule includes the first application descriptor.

Abstract: Example communication methods and communications apparatuses are provided to verify a user equipment route selection policy (URSP) used by a terminal apparatus. One example communication method includes obtaining information about a first application of at least one packet data unit (PDU) session, where the information about the first application is determined based on a first URSP, and then sending the information about the first application to a second network element, where the information about the first application is used to verify whether information about a second application of the at least one PDU session matches the information about the first application, and the information about the second application is information about an application to which a data packet in the at least one PDU session belongs.

Abstract: A policy transmission method, a policy control function (PCF) network element, and a computer storage medium, where the method includes: obtaining, by a PCF network element, a connection management state of a terminal apparatus, where the connection management state includes a connected mode or an idle mode; and sending, by the PCF network element, policy rule information to the terminal apparatus when the connection management state of the terminal apparatus is the connected mode.

Abstract: Embodiments of this application provide a communication method, device, and system. The method includes: A terminal device receives first information from a network device, where the first information includes identification information of a first network slice and information about a first radio resource for accessing the first network slice. The terminal device accesses the first network slice based on the first information by using the first radio resource. According to this method, a success rate of accessing a slice can be improved, so that user experience is improved.

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.