Communication method and apparatus based on quality of service (QoS) in network slice-based mobile communication network

A communication apparatus comprising:

• a processor;
• and
• a memory configured to store at least one instruction executable by the processor,
• wherein, when the at least one instruction is executed by the processor, the processor is configured:
• to determine whether a first sum of a bitrate of a service data flow (SDF) requested from a packet data unit (PDU) and a using network slice bitrate (NSB) of a network slice corresponding to the requested SDF exceeds a reference NSB allocated to the network slice,
• to determine whether a second sum of the bitrate of the requested SDF and a first using session bitrate (SB) of an access point network (APN) corresponding to the requested SDF exceeds a first reference SB allocated to the APN, when the first sum is determined to not exceed the reference NSB,
• to determine whether a third sum of the bitrate of the requested SDF and a second using SB of a PDU flow corresponding to the requested SDF exceeds a second reference SB allocated to the PDU flow, when the second sum is determined to not exceed the first reference SB, and
• to process the requested SDF to guarantee that a quality of the requested SDF is greater than or equal to a predetermined level, when the third sum is determined to not exceed the second reference SB.