Non-orthogonal transmission method and apparatus in communication system

An operation method of a base station in a communication system, comprising:

• configuring resources for transmission indicators used for respectively identifying a plurality of terminals performing uplink transmission;
• transmitting a control message including information on a resource allocated for a first transmission indicator for a first terminal to the first terminal among the plurality of terminals;
• receiving the first transmission indicator from the first terminal through the resource allocated for the first transmission indicator;
• and
• after receiving the first transmission indicator, performing a monitoring operation on a preconfigured resource between the base station and the first terminal to receive a first uplink signal of the first terminal.

A first terminal in a communication system, comprising a processor and a memory storing at least one instruction executed by the processor, wherein the at least one instruction is configured to:

• receive, from a base station, a control message including information on a resource allocated for a transmission indicator used for identifying the first terminal among a plurality of terminals performing uplink transmission;
• transmit the transmission indicator to the base station using the resource allocated for the transmission indicator;
• and
• after transmitting the transmission indicator, transmit a first uplink signal to the base station using a preconfigured resource without an uplink grant.