Method and apparatus for supporting multiple message a sizes and uplink coverage for two step random access procedure

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

• transmitting, to a terminal, first information on first uplink resources for a first message of a 2-step random access procedure, second information on second uplink resources for the first message of the 2-step random access procedure, third information on a threshold size to determine the first uplink resources or the second uplink resources for the first message of the 2-step random access procedure, and fourth information on a reference signal received power (RSRP) threshold for selection between the 2-step random access procedure and a 4-step random access procedure;
• and
• receiving, from the terminal, the first message of the 2-step random access procedure using a resource,
• wherein the 2-step random access procedure is selected based on an RSRP for downlink being above the RSRP threshold,
• wherein, in case that a size of information included in the first message of the 2-step random access procedure is greater than the threshold size, the resource is identified from the first uplink resources, and
• wherein, in case that the size of the information included in the first message of the 2-step random access procedure is not greater than the threshold size, the resource is identified from the second uplink resources.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• receive, from a base station, first information on first uplink resources for a first message of a 2-step random access procedure, second information on second uplink resources for the first message of the 2-step random access procedure, third information on a threshold size to determine the first uplink resources or the second uplink resources for the first message of the 2-step random access procedure, and fourth information on a reference signal received power (RSRP) threshold for selection between the 2-step random access procedure and a 4-step random access procedure,
• select a random access type as the 2-step random access procedure based on an RSRP for downlink being above the RSRP threshold,
• identify whether a size of information to be included in the first message is greater than the threshold size based on the 2-step random access procedure being selected,
• in case that the size of the information is greater than the threshold size, select a resource from the first uplink resources,
• in case that the size of the information is not greater than the threshold size, select the resource from the second uplink resources, and
• transmit, to the base station, the first message of the 2-step random access procedure using a resource from the selected uplink resources.

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

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• transmit, to a terminal, first information on first uplink resources for a first message of a 2-step random access procedure, second information on second uplink resources for the first message of the 2-step random access procedure, third information on a threshold size to determine the first uplink resources or the second uplink resources for the first message of the 2-step random access procedure, and fourth information on a reference signal received power (RSRP) threshold for selection between the 2-step random access procedure and a 4-step random access procedure, and
• receive, from the terminal, the first message of the 2-step random access procedure using a resource,
• wherein the 2-step random access procedure is selected based on an RSRP for downlink being above the RSRP threshold,
• wherein, in case that a size of information included in the first message of the 2-step random access procedure is greater than the threshold size, the resource is identified from the first uplink resources, and
• wherein, in case that the size of the information included in the first message of the 2-step random access procedure is not greater than the threshold size, the resource is identified from the second uplink resources.