# US 12,010,732 B2 · Terminal apparatus, base station apparatus, control method, and computer-readable storage medium for executing random access procedure

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- Number: US 12,010,732 B2
- Document ID: US12010732B2
- Status: Granted
- Kind: B2
- Application number: 17/396,985
- Filed: 2021-08-09
- Published: 2021-11-25
- Granted: 2024-06-11
- Earliest claimed: 2019-02-13
- Assignees: Kddi Corporation
- Applicants: Kddi Corporation
- Inventors: Takeo Ohseki; Issei Kanno; Yasuhiro Suegara; Masahito Umehara
- Web page: https://patentgrep.com/patent/US12010732B2

## CPC

- H04W 74/002: {Transmission of channel access control information}
- H04W 74/0841: {with collision treatment}
- H04W 74/0836: with 2-step access
- H04W 76/10: Connection setup
- H04W 76/11: Allocation or use of connection identifiers
- H04W 8/26: Network addressing or numbering for mobility support
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A terminal apparatus, which is 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, acquires a random access-radio network temporary identifier (RA-RNTI) on the basis of a radio resource having been used to transmit the predetermined information with the first signal, and executes reception processing of the second signal using the RA-RNTI.

## Claims

### Claim 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.

### Claim 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.

### Claim 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.

### Claim 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.

### Claim 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.

### Claim 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.