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

1. A terminal apparatus able to establish a connection with a base station apparatus via a two-step random access procedure by transmitting a first signal including a random access preamble and predetermined information to the base station apparatus and receiving a second signal as a reply to the first signal from the base station apparatus, wherein

the terminal apparatus acquires a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal, and

the terminal apparatus executes reception processing of the second signal using the RA-RNTI,

wherein the terminal apparatus is further able to establish a connection with the base station apparatus via a four-step random access procedure, and

in a case where the four-step random access procedure is used, the terminal apparatus acquires a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure and executes reception processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.

2. A base station apparatus able to establish a connection with a terminal apparatus via a two-step random access procedure by receiving a first signal including a random access preamble and predetermined information from the terminal apparatus and transmitting a second signal as a reply to the first signal to the terminal apparatus, wherein

the base station apparatus acquires a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal; and

the base station apparatus executes transmission processing of the second signal using the RA-RNTI,

wherein the base station apparatus is further able to establish a connection with the terminal apparatus via a four-step random access procedure, and

in a case where the four-step random access procedure is used, the base station apparatus acquires a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure and executes transmission processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.

3. A control method executed by a terminal apparatus, comprising: establishing a connection with a base station apparatus via a two-step random access procedure by transmitting a first signal including a random access preamble and predetermined information to the base station apparatus and receiving a second signal as a reply to the first signal from the base station apparatus or via a four step random access procedure; and

when establishing the connection via the two-step random access procedure,

acquiring a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal, and executing reception processing of the second signal using the RA-RNTI, and

when establishing the connection via the four-step random access procedure,

acquiring a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure, and

executing reception processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.

4. A control method executed by a base station apparatus, comprising: establishing a connection with a terminal apparatus via a two-step random access procedure by receiving a first signal including a random access preamble and predetermined information from the terminal apparatus and transmitting a second signal as a reply to the first signal to the terminal apparatus or via a four-step random access procedure; and

when establishing the connection via the two-step random access procedure,

acquiring a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal, and

executing transmission processing of the second signal using the RA-RNTI, and

when establishing the connection via the four-step random access procedure,

acquiring a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure, and

executing transmission processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.

5. A non-transitory computer-readable storage medium that stores a program for causing a computer provided in a terminal apparatus to:

establish a connection with a base station apparatus via a two-step random access procedure by transmitting a first signal including a random access preamble and predetermined information to the base station apparatus and receiving a second signal as a reply to the first signal from the base station apparatus or via a four-step random access procedure; and

when establishing the connection via the two-step random access procedure,

acquire a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal, and

execute reception processing of the second signal using the RA-RNTI, and

when establishing the connection via the four-step random access procedure

acquire a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure, and

execute reception processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.

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

establish a connection with a terminal apparatus via a two-step random access procedure by receiving a first signal including a random access preamble and predetermined information from the terminal apparatus and transmitting a second signal as a reply to the first signal to the terminal apparatus or via a four-step random access procedure; and

when establishing the connection via the two-step random access procedure,

acquire a random access-radio network temporary identifier (RA-RNTI) by adding a predetermined offset value to a value acquired on the basis of a radio resource having been used to transmit the random access preamble with the first signal, and

execute transmission processing of the second signal using the RA- RNTI, and

when establishing the connection via the four-step random access procedure,

acquire a second RA-RNTI on the basis of a radio resource having been used to transmit a random access preamble from the terminal apparatus to the base station apparatus via the four-step random access procedure, and

execute transmission processing of a random access response, which is a reply to the random access preamble, using the second RA-RNTI.