Device and method for performing random access in non-terrestrial network system

A user equipment (UE) for performing wireless transmission and reception, the UE comprising:

• a transceiver configured to:
• receive, from a network node, random access channel (RACH) configuration information, wherein the RACH configuration information includes zero correlation zone (ZCZ) configuration information that indicates at least one cyclic shift value among a plurality of cyclic shift values used for generating a random access preamble, wherein the plurality of cyclic shift values is divided into a first set and a second set according to a cell coverage applied thereto, and wherein the second set is applied to a cell coverage larger than the first set,
• transmit, to the network node, the random access preamble,
• receive, from the network node, a response message in response to the random access preamble, and
• transmit, to the network node, a message based on the response message;
• and
• a processor configured to generate the random access preamble based on a cyclic shift (Ncs) value of the at least one cyclic shift value,
• wherein the first set is applied to a cell of a terrestrial network (TN), and the second set is applied to a cell of a non-terrestrial network (NTN),
• wherein the ZCZ configuration information is configured with a 5-bit field that indicates an index between 0 to 31,
• wherein the RACH configuration information further includes restricted set configuration information that represents whether the UE belongs to one of an unrestricted set, a restricted set A, or a restricted set B, and
• wherein the random access preamble is determined based on a combination of the Ncs value and the restricted set configuration information.

A method for performing wireless transmission and reception, performed by a network node, the method comprising:

• transmitting, to a user equipment (UE), random access channel (RACH) configuration information, wherein the RACH configuration information includes zero correlation zone (ZCZ) configuration information that indicates at least one cyclic shift value among a plurality of cyclic shift values used for generating a random access preamble, wherein the plurality of cyclic shift values is divided into a first set and a second set according to a cell coverage applied thereto, and wherein the second set is applied to a cell coverage larger than the first set;
• receiving, from the UE, the random access preamble generated based on a cyclic shift (Ncs) value of the at least one cyclic shift value;
• transmitting, to the UE, a response message in response to the random access preamble;
• and
• receiving, from the UE, a message transmitted based on the response message,
• wherein the first set is applied to a cell of a terrestrial network (TN), and the second set is applied to a cell of a non-terrestrial network (NTN),
• wherein the ZCZ configuration information is configured with a 5-bit field that indicates an index between 0 to 31,
• wherein the RACH configuration information further includes restricted set configuration information that represents whether the UE belongs to one of an unrestricted set, a restricted set A, or a restricted set B, and
• wherein the random access preamble is determined based on a combination of the Ncs value and the restricted set configuration information.