A disclosure of the present specification provides a method for an AMF node to communicate. The method comprises the steps of: receiving, from a UDM node, updated subscriber information about a Remote UE; determining whether to stop a service to the Remote UE on the basis of the updated subscriber information about the Remote UE; and transmitting, to a Relay UE communicating with the Remote UE, a deregistration request message requesting deregistration of the Remote UE.

A disclosure of the present specification provides a method for an AMF node to communicate. The method comprises the steps of: receiving, from a UDM node, updated subscriber information about a Remote UE; determining whether to stop a service to the Remote UE on the basis of the updated subscriber information about the Remote UE; and transmitting, to a Relay UE communicating with the Remote UE, a deregistration request message requesting deregistration of the Remote UE.

A session management function (SMF) sends to a charging function (CHF), a charging policy request message requesting charging policy information for a packet data unit (PDU) session of a wireless device. The SMF receives, by from the CHF, a response message comprising the charging policy information for the PDU session. The charging policy information comprises: a first charging method; and an information element indicating that a first charging rate is applicable for the PDU session. The SMF determines, based on the charging policy information, a charging control rule for the PDU session. The SMF enforces the charging control rule.

A session management function (SMF) sends to a charging function (CHF), a charging policy request message requesting charging policy information for a packet data unit (PDU) session of a wireless device. The SMF receives, by from the CHF, a response message comprising the charging policy information for the PDU session. The charging policy information comprises: a first charging method; and an information element indicating that a first charging rate is applicable for the PDU session. The SMF determines, based on the charging policy information, a charging control rule for the PDU session. The SMF enforces the charging control rule.

A wireless communication method for use in a wireless network function comprises receiving, from a first session management function (SMF) a registration request of a packet data unit (PDU) session corresponding to a second SMF, and transmitting, to the second SMF, a notification which indicates the PDU session is controlled by another SMF.

A wireless communication method for use in a wireless network function comprises receiving, from a first session management function (SMF) a registration request of a packet data unit (PDU) session corresponding to a second SMF, and transmitting, to the second SMF, a notification which indicates the PDU session is controlled by another SMF.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein provide a method of an access and mobility management function (AMF). The method includes monitoring whether a user equipment (UE) registered to a network slice establishes a protocol data unit (PDU) session using the network slice for a time, determining that the UE does not establish the PDU session in the time based on an expiration of a timer and deregistering the UE for the network slice.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments herein provide a method of an access and mobility management function (AMF). The method includes monitoring whether a user equipment (UE) registered to a network slice establishes a protocol data unit (PDU) session using the network slice for a time, determining that the UE does not establish the PDU session in the time based on an expiration of a timer and deregistering the UE for the network slice.

A disclosure of the present specification provides a method for processing establishment of a protocol data unit (PDU) session by an access and mobility management function (AMF) node. The method may include a step of receiving a PDU session establishment request message from a user equipment (UE) via either a first access or a second access. The PDU session establishment request message may include information indicative of a multi access (MA) PDU session. The method may include a step of selecting a session management function (SMF) node supporting the MA PDU session on the basis of the information indicative of the MA PDU session. The method may include a step of sending the PDU session establishment request message to the SMF node supporting the MA PDU session.

A disclosure of the present specification provides a method for processing establishment of a protocol data unit (PDU) session by an access and mobility management function (AMF) node. The method may include a step of receiving a PDU session establishment request message from a user equipment (UE) via either a first access or a second access. The PDU session establishment request message may include information indicative of a multi access (MA) PDU session. The method may include a step of selecting a session management function (SMF) node supporting the MA PDU session on the basis of the information indicative of the MA PDU session. The method may include a step of sending the PDU session establishment request message to the SMF node supporting the MA PDU session.