Terminal, radio communication method, and system
A terminal is disclosed including a receiving section that receives information indicating a first number of preamble transmission, 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 transmission; and a control section that when a number of preamble transmission 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 transmission is the second number, determines a failure of the 4-step random access procedure. In other aspects a radio communication method and a system are also disclosed.
1. A terminal comprising:
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.
2. The terminal according to claim 1 , wherein the first number is less than the second number.
3. 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.
4. 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.