Method and device for transmitting and receiving signal by using time offset in time-asynchronous non-orthogonal multiple access system

A method for receiving a signal using a time offset by a UE in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, the method comprising:

• receiving, from a base station, a first signal for another UE and a second signal for the UE;
• performing sampling on the first signal and the second signal to identify a time offset set for the second signal;
• and
• obtaining a bit stream corresponding to the second signal based on a result of the sampling,
• wherein the time offset is determined based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system.

A base station transmitting a signal using a time offset in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• identify a first bit stream for a first user equipment (UE) and a second bit stream for a second UE;
• determine a time offset for the second UE based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system;
• and
• transmit a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream on a resource allocated based on the time offset.

A UE receiving a signal using a time offset in a time-asynchronous nonorthogonal multiple access (TA-NOMA) system, comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• receive, from a base station, a first signal for another UE and a second signal for the UE;
• perform sampling on the first signal and the second signal to identify a time offset set for the second signal;
• and
• obtain a bit stream corresponding to the second signal based on a result of the sampling,
• wherein the time offset is determined based on a number of UEs operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system.