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1 接入网的功能 接入网的功能可分为五个基本功能组,即用户接口功能(UPF)、业务接口功能(SPF)、核心功能(CF)、传送功能(TF)和系统管理功能(SMF)。功能组之间的关系如图1所示。
1 Functions of Access Network The functions of access network can be divided into five basic functional groups: user interface function (UPF), service interface function (SPF), core function (CF), transfer function (TF) and system management function (SMF). The relationship between functional groups shown in Figure 1.