PFD METHOD AND APPARATUS FOR PROVISIONING BI-DIRECTIONAL FILTER IN A PFD MANAGEMENT PROCEDURE

The present disclosure relates to a communication technique and a system for converging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate after a 4G system. The present disclosure is applicable to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security, and safety related services, etc.) based on 5G communication technologies and IoT-related technologies. The present disclosure relates to an operation between an SMF (session management function) and a UPF (user plane function) of a 5G core network (5GC), and relates to a method of providing a bidirectional PFD to a UPF in a PFD management procedure. According to the present invention, since only one of an uplink PFD or a downlink PFD may be provided to the UPF, it is possible to prevent transmission and reception of redundant information and solve the problem of limiting the size of messages which can be transmitted and received between the SMF and the UPF. According to the present invention, a method of a first network entity performing SMF in a communication system comprises the steps of: acquiring a first filter for a first direction relevant to an application and a second filter for a second direction; confirming whether the first filter is a bidirectional filter based on results of comparing the first and second filters; when the first filter is a bidirectional filter, confirming whether a second network entity performing UPF supports a function of acquiring the second filter based on the first filter; and when the second network entity support the function, transmitting the first filter and a message containing information indicating that the first filter is the bidirectional filter to the second network entity. 본 개시는 4G 시스템 이후 보다 높은 데이터 전송률을 지원하기 위한 5G 통신 시스템을 IoT 기술과 융합하는 통신 기법 및 그 시스템에 관한 것이다. 본 개시는 5G 통신 기술 및 IoT 관련 기술을 기반으로 지능형 서비스 (예를 들어, 스마트 홈, 스마트 빌딩, 스마트 시티, 스마트 카 혹은 커넥티드 카, 헬스 케어, 디지털 교육, 소매업, 보안 및 안전 관련 서비스 등)에 적용될 수 있다. 본 개시는 5GC (5G core network)의 SMF 및 UPF 간 동작에 관한 것으로, PFD 관리 절차에 있어서, UPF에 양방향 PFD를 제공하는 방법에 관한 것이다. 이에 따르면, 상향링크에 대한 PFD 또는 하향링크에 대한 PFD 중 어느 하나만 UPF에 제공해도 됨에 따라 중복적인 정보의 송수신을 방지하고, SMF 및 UPF 간 송수신될 수 있는 메시지 크기의 제약 문제를 해결할 수 있다.