Terminal apparatus, base station apparatus, control method, and computer-readable storage medium for coverage expansion in random access procedure

A base station apparatus, comprising:

• at least one processor;
• and
• at least one memory that stores a computer-readable instruction for causing, when executed by the at least one processor, the at least one processor to:
• detect a random access preamble transmitted from a terminal apparatus, with a first resource with which an apparatus that is not capable of performing repeated transmission of a message 3 in a four-step random access procedure in consecutive slots can transmit the random access preamble, and with a second resource that is different from the first resource and with which an apparatus that is capable of performing repeated transmission of the message 3 in consecutive slots can transmit the random access preamble,
• determine whether to instruct the terminal apparatus to perform the repeated transmission of the message 3 based on whether the random access preamble is detected with the first resource or the second resource, and
• control connection with the terminal apparatus based on the determination.

A control method to be executed by a base station apparatus, comprising:

• detecting a random access preamble transmitted from a terminal apparatus, with a first resource with which an apparatus that is not capable of performing repeated transmission of a message 3 in a four-step random access procedure in consecutive slots can transmit the random access preamble, and with a second resource that is different from the first resource and with which an apparatus that is capable of performing repeated transmission of the message 3 in consecutive slots can transmit the random access preamble;
• determining whether to instruct the terminal apparatus to execute the repeated transmission of the message 3 based on whether the random access preamble is detected with the first resource or the second resource;
• and
• controlling connection with the terminal apparatus based on the determination.

A non-transitory computer-readable storage medium that stores a program for causing a computer provided in a base station apparatus to:

• detect a random access preamble transmitted from a terminal apparatus, with a first resource with which an apparatus that is not capable of performing repeated transmission of a message 3 in a four-step random access procedure in consecutive slots can transmit the random access preamble, and with a second resource that is different from the first resource and with which an apparatus that is capable of performing repeated transmission of the message 3 in consecutive slots can transmit the random access preamble;
• determine whether to instruct the terminal apparatus to execute the repeated transmission of the message 3 based on whether the random access preamble is detected with the first resource or the second resource;
• and
• controlling connection with the terminal apparatus based on the determination.