Device and Method of Handling User Plane Evolved Packet System Optimization Procedure

A communication device for handling a User Plane Evolved Packet System (EPS) Optimization procedure, comprising:

• a storage unit, for storing instructions of:
• a radio resource control (RRC) layer of the communication device receiving system information from a cell of a network;
• an EPS mobility management (EMM) layer of the communication device requesting the RRC layer to perform a RRC connection resume procedure, by transmitting a resume request to the RRC layer;
• the RRC layer transmitting a RRC connection resume request message to the network, if a RRC connection is suspended and the system information indicating that a User Plane EPS Optimization functionality is allowed in the cell, when the RRC layer receives the resume request from the EMM layer;
• and
• the RRC layer transmitting a RRC Connection Request message to the network, if the RRC connection is suspended and the system information indicating that the User Plane EPS Optimization functionality is not allowed in the cell, when the RRC layer receives the resume request from the EMM layer;
• and
• a processing circuit, coupled to the storage unit, configured to execute the instructions stored in the storage unit.