Method and apparatus for initial access of terminal in wireless communication system

A method performed by a base station in a communication system, the method comprising:

• transmitting, to a terminal, system information including random access channel (RACH) configuration information, the RACH configuration information including a physical RACH (PRACH) configuration index;
• and
• receiving, from the terminal, a random access preamble on a resource which is identified based on information on a slot in which the random access preamble is to be transmitted and a symbol offset indicating a starting position of the random access preamble in the slot,
• wherein the information on the slot is based on the PRACH configuration index and a subcarrier spacing,
• wherein the symbol offset is based on the subcarrier spacing, and wherein the subcarrier spacing is based on the RACH configuration information.

A terminal in a communication system, the terminal comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• control the transceiver to receive, from a base station, system information including random access channel (RACH) configuration information, the RACH configuration information including a physical RACH (PRACH) configuration index,
• identify a subcarrier spacing based on the RACH configuration information,
• identify a resource in which a random access preamble is to be transmitted based on information on a slot in which the random access preamble is to be transmitted and a symbol offset indicating a starting position of the random access preamble in the slot, and
• control the transceiver to transmit, to the base station, the random access preamble based on the resource,
• wherein the information on the slot is based on the PRACH configuration index and the subcarrier spacing, and
• wherein the symbol offset is based on the subcarrier spacing.

A base station in a communication system, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• control the transceiver to transmit system information including random access channel (RACH) configuration information, the RACH configuration information including a physical RACH (PRACH) configuration index, and
• control the transceiver to receive a random access preamble on a resource which is identified based on information on a slot in which the random access preamble is to be transmitted and a symbol offset indicating a starting position of the random access preamble in the slot,
• wherein the information on the slot is based on the PRACH configuration index and a subcarrier spacing,
• wherein the symbol offset is based on the subcarrier spacing, and wherein the subcarrier spacing is based on the RACH configuration information.