Terminal, radio communication method, and system

A radio communication method for a terminal, comprising:

• receiving information indicating a first number of preamble transmissions, the information being a condition for switching from a 2-step random access procedure to a 4-step random access procedure, and information indicating a second number which is a maximum number of preamble transmissions;
• and
• when a number of preamble transmissions is the first number, controlling to switch from a 2-step random access procedure to a 4-step random access procedure, and
• when the number of preamble transmissions is the second number, determining a failure of the 4-step random access procedure that has been switched from the 2-step random access procedure,
• wherein the terminal controls, based on the information indicating the second number, whether or not to report, to a higher layer, the failure of the 4-step random access procedure that has been switched from the 2-step random access procedure.

A system comprising a terminal and a base station, wherein

• the terminal comprises:
• a receiver that receives information indicating a first number of preamble transmissions, the information being a condition for switching from a 2-step random access procedure to a 4-step random access procedure, and information indicating a second number which is a maximum number of preamble transmissions;
• and
• a processor that when a number of preamble transmissions is the first number, controls to switch from a 2-step random access procedure to a 4-step random access procedure, and when the number of preamble transmissions is the second number, determines a failure of the 4-step random access procedure that has been switched from the 2-step random access procedure,
• wherein the processor controls, based on the information indicating the second number, whether or not to report, to a higher layer, the failure of the 4-step random access procedure that has been switched from the 2-step random access procedure, and
• the base station comprises:
• a transmitter that transmits the information indicating the first number and the information indicating the second number.