Method and apparatus for beam search in communication system

A method of a receiving node, comprising:

• exchanging, with a transmitting node, configuration information for beam direction search, which is generated by the transmitting node;
• receiving a received attention strength indication (RASI) signal through a coarse beam in an occasion based on the configuration information;
• calculating an RASI measurement value obtained by measuring the received RASI signal and a reception SNR measurement value of the RASI signal;
• transmitting a measurement message including the RASI measurement value and the reception SNR measurement value to the transmitting node;
• and
• communicating with the transmitting node based on the measurement message.

A transmitting node, comprising at least one processor, wherein the at least one processor causes the transmitting node to perform:

• exchanging, with a receiving node, configuration information for beam direction search;
• generating a received attention strength indication (RASI) signal based on the configuration information;
• transmitting the RASI signal to a receiving node through a coarse beam via a selected partitioned area among partitioned areas within a beam search direction, in a transmission occasion of the RASI signal based on the configuration information;
• receiving, from the receiving node, a measurement message including RASI information;
• identifying whether the receiving node is located within the selected partitioned area based on the RASI information included in the measurement message;
• and
• in response to the receiving node being located within the selected partitioned area, adjusting a beam direction for beam alignment based on the RASI information,
• wherein the RASI information includes an RASI measurement value obtained by measuring a correlation with a sequence included in the RASI signal and a reception signal-to-noise ratio (SNR) measurement value.