Selection system for a quality of service flow and selection method employing the same

A customer-promises equipment (CPE) in electronic communication with an element management system (EMS) through a base station (BS), the CPE comprising:

• a signal transceiver unit that transmits predetermined request information to the EMS through the BS;
• and
• a signal processing unit electrically connected to the signal transceiver unit, the signal processing unit configured for determining a maximum sustained rate (MSR) of an extended real-time polling service (ERTPS) flow of the BS according to the request information, wherein the signal processing unit determines whether or not the MSR of the ERTPS flow enables support for multiway calls between the CPE and the EMS, and in response to the MSR of the ERTPS flow is unable to support for multiway calls, the signal processing unit creates a quality of service (QoS) flow, and the QoS flow is set to an one flow one call (OFOC) mode;
• in response to the MSR of the ERTPS flow enables the multiway calls, the signal processing unit obtains load values of the BS, and compares the obtained load values with a predetermined threshold value of the BS, and sets the QoS flow to the OFOC mode if the obtained load value is below the threshold value of the BS;
• if the obtained load value exceeds the threshold value of the BS, the signal processing unit enables and sets the QoS flow to a one flow all call (OFAC) mode.