Method and apparatus for monitoring data usage in wireless communication system

Abstract

A session management function (SMF) entity related to a first protocol data unit (PDU) session between a user equipment (UE) and a data network (DN) for a network slice, for monitoring data usage is provided. The SMF entity includes a transceiver, and at least one processor coupled with the transceiver and configured to determine to change at least one of a target user plane function (UPF) or a target SMF for connectivity between the UE and the DN for the network slice, transmit an update request message including accumulated data usage information for the first PDU session to a policy control function (PCF) configured to update remaining allowed usage, based on the determining to change at least one of the target UPF or the target SMF, and receive a response message from the PCF, the remaining allowed usage being updated based on the accumulated data usage information.

Dependencies are inferred from the claim text.