Operating method and apparatus according to data duplicate retransmission in mobile communication system

An apparatus of a User Equipment (UE) according to data duplicate retransmission in a mobile communication system, the apparatus comprising:

• a soft buffer for storing a Media Access Control Protocol Data Unit (MAC PDU) received from an Evolved Node B (ENB);
• a decoder for decoding the MAC PDU stored in the soft buffer;
• and
• a controller for determining whether the decoding is a first successful decoding of data of the corresponding soft buffer, and determining whether to forward the decoded MAC PDU to an upper layer according to the determination result.

A method of a User Equipment (UE) according to data duplicate retransmission in a mobile communication system, the method comprising:

• receiving a Media Access Control Protocol Data Unit (MAC PDU);
• determining whether the MAC PDU comprises a control signal for correcting uplink timing synchronization;
• and
• if it is determined that the MAC PDU comprises the control signal, determining a duplicate reception of the control signal using a Sequence Number (SN) for the control signal.

An apparatus of an Evolved Node B (ENB) according to data duplicate retransmission in a mobile communication system, the apparatus comprising:

• a Media Access Control (MAC) control signal generator for, when an event for correcting uplink timing synchronization of a User Equipment (UE) occurs, generating a control signal comprising a Sequence Number (SN);
• a MAC generator for generating a MAC Protocol Data Unit (PDU) comprising the control signal;
• and
• a Hybrid Automatic Repeat reQuest (HARQ) entity for controlling to transmit the MAC PDU to a corresponding UE according to a HARQ process.