Method and apparatus for timing control in wireless communication system

A timing control method performed by a base station included in a communication network, the timing control method comprising:

• configuring an initial timing reference based on time information obtained from the communication network;
• transmitting information indicating a determination scheme of a first timing advance (TA) value to a terminal;
• transmitting a first downlink (DL) signal including information on a first transmission time and first additional information to the terminal included in the communication network, the first transmission time being a timing when the first DL signal is transmitted by the station identified based on the initial timing reference, and the first additional information including a transmission delay between the base station and a core network;
• receiving, from the terminal, a first uplink (UL) signal transmitted based on an uplink (UL) transmission timing adjusted based on the first TA value;
• and
• determining a second TA value for readjustment of the UL transmission timing of the terminal based on the first UL signal,
• wherein the first TA value is determined by the terminal based on a first difference value and a first reference value when the determination scheme indicated by the base station is a second determination scheme, the first TA value is determined by the terminal based on the first difference value without considering the first reference value when the determination scheme indicated by the base station is a first determination scheme, the first difference value corresponds to a difference between the first transmission time and a first reception time that is a timing when the first DL signal is received by the terminal, the first reception time is identified by the terminal based on the time information obtained from the communication network, and the first reference value is calculated based on the transmission delay between the base station and the core network.

A terminal included in a communication network, the terminal comprising:

• a processor;
• a memory electronically communicating with the processor;
• and
• instructions stored in the memory,
• wherein when executed by the processor, the instructions cause the terminal to:
• configure an initial timing reference based on time information obtained from the communication network;
• receive information indicating a determination scheme of a first timing advance (TA) value from a base station;
• receive a first downlink (DL) signal from the base station, the first DL signal including information on a first transmission time that is a timing when the first DL signal is transmitted by the base station and first additional information including a transmission delay between the base station and a core network;
• obtain the information on the first transmission time based on the first DL signal;
• obtain information on a first reception time that is a timing when the first DL signal is received by the terminal based on the first DL signal and the initial timing reference configured based on the time information;
• identify a first difference value corresponding to a difference between the first reception time and the first transmission time;
• calculate a first reference value based on the transmission delay between the base station and the core network;
• determine the first TA value based on the identified first difference value and the calculated first reference value when the determination scheme indicated by the base station is a second determination scheme;
• and
• adjust an uplink (UL) transmission timing for the base station based on the first TA value,
• wherein the first transmission time is identified by the base station based on the time information obtained from the communication network, and the first TA value is determined based on the identified first difference value without considering the calculated first reference value when the determination scheme indicated by the base station is a first determination scheme.