Terminal device, base station device, method, and recording medium
A method and corresponding terminal device including a selector that selects, in a RACH procedure, whether to transmit a first uplink message or a second uplink message to a base station device, the first uplink message being an uplink message of a two-step RACH procedure, the second uplink message being an uplink message of a four-step RACH procedure.
1 . A user equipment comprising:
circuitry configured to
select, in a random access procedure, one of a first uplink message or a second uplink message for transmission to a base station device, the first uplink message being an uplink message of a two-step random access procedure, the second uplink message being an uplink message of a four-step random access procedure;
transmit the selected one of the first uplink message or the selected second uplink message to a base station apparatus; and
receive a first random access response to the transmitted first uplink message or a second random access response to the transmitted second uplink message,
wherein the first random access response is configured to be scheduled by a first Physical Downlink Control Channel (PDCCH) having a first Cyclic Redundancy Check (CRC) that is scrambled by a first Radio Network Temporary Identifier (RNTI),
wherein the second random access response is configured to be scheduled by a second PDCCH having a second CRC that is scrambled by a second RNTI,
wherein the first RNTI is used in the two-step random access procedure and the second RNTI is a Random Access RNTI (RA-RNTI) used in the four-step random access procedure, and
wherein the first RNTI used in the two-step random access procedure includes a predetermined offset value relative to the second RNTI used in the four-step random access procedure.
2 . The user equipment according to claim 1 , wherein the first uplink message contains a first random access preamble message and a Physical Uplink Shared Channel (PUSCH) message, and
wherein the second uplink message only contains a second random access preamble message.
3 . The user equipment according to claim 2 , wherein the first RNTI is determined based on a time and frequency resource of the first random access preamble message, and the second RNTI is determined based on a time and frequency resource of the second random access preamble message.
4 . A base station apparatus comprising:
circuitry configured to
receive one of a first uplink message or a second uplink message from a user equipment,
wherein the first uplink message is an uplink message of a two-step random access procedure, and
wherein the second uplink message is an uplink message of a four-step random access procedure; and
transmit a first random access response to the received first uplink message or a second random access response to the received second uplink message,
wherein the first random access response is configured to be scheduled by a first Physical Downlink Control Channel (PDCCH) having a first Cyclic Redundancy Check (CRC) that is scrambled by a first Radio Network Temporary Identified (RNTI),
wherein the second random access response is scheduled by a second PDCCH having a second CRC that is scrambled by a second RNTI,
wherein the first RNTI is used in the two-step random access procedure and the second RNTI is a Random Access RNTI (RA-RNTI) used in the four-step random access procedure, and
wherein the first RNTI used in the two-step random access procedure includes is calculated to include a predetermined offset value relative to the second RNTI for the second RA RNTI used in the four-step random access procedure.
5 . The base station apparatus according to claim 4 , wherein the first uplink message contains a first random access preamble message and a Physical Uplink Shared Channel (PUSCH) message, and
wherein the second uplink message only contains a second random access preamble message.
6 . The base station apparatus according to claim 5 , wherein the first RNTI is determined based on a time and frequency resource of the first random access preamble message, and the second RNTI is determined based on a time and frequency resource of the second random access preamble message.
7 . A method for a user equipment, the method comprising:
selecting, in a random access procedure, one of a first uplink message or a second uplink message for transmission to a base station device, the first uplink message being an uplink message of a two-step random access procedure, the second uplink message being an uplink message of a four-step random access procedure;
transmitting the selected one of the first uplink message or the selected second uplink message to a base station apparatus; and
receiving a first random access response to the transmitted first uplink message or a second random access response to the transmitted second uplink message,
wherein the first random access response is configured to be scheduled by a first Physical Downlink Control Channel (PDCCH) having a first Cyclic Redundancy Check (CRC) that is scrambled by a first Radio Network Temporary Identifier (RNTI),
wherein the second random access response is configured to be scheduled by a second PDCCH having a second CRC that is scrambled by a second RNTI,
wherein the first RNTI used in the two-step random access procedure and the second RNTI is a Random Access RNTI (RA-RNTI) used in the four-step random access procedure, and
wherein the first RNTI used in the two-step random access procedure includes a predetermined offset value relative to the second RNTI used in the four-step random access procedure.
8 . The method according to claim 7 , wherein the first uplink message contains a first random access preamble message and a Physical Uplink Shared Channel (PUSCH) message, and
wherein the second uplink message only contains a second random access preamble message.
9 . The method according to claim 8 , wherein the first RNTI is determined based on a time and frequency resource of the first random access preamble message, and the second RNTI is determined based on a time and a frequency resource of the second random access preamble message.
10 . A method for a base station apparatus, the method comprising:
receiving one of a first uplink message or a second uplink message from a user equipment,
wherein the first uplink message is an uplink message of a two-step random access procedure, and
wherein the second uplink message is an uplink message of a four-step random access procedure; and
transmitting a first random access response to the received first uplink message or a second random access response to the received second uplink message,
wherein the first random access response is configured to be scheduled by a first Physical Downlink Control Channel (PDCCH) having a first Cyclic Redundancy Check (CRC) that is scrambled by a first Radio Network Temporary Identifier (RNTI),
wherein the second random access response is scheduled by a second PDCCH having a second CRC that is scrambled by a second RNTI,
wherein the first RNTI is used in the two-step random access procedure and the second RNTI is a Random Access RNTI (RA-RNTI) used in the four-step random access procedure, and
wherein the first RNTI used in the two-step random access procedure includes a predetermined offset value relative to the second RNTI used in the four-step random access procedure.
11 . The method according to claim 10 , wherein the first uplink message contains a first random access preamble message and a Physical Uplink Shared Channel (PUSCH) message, and
wherein the second uplink message only contains a second random access preamble message.
12 . The method according to claim 11 , wherein the first RNTI is determined based on a time and frequency resource of the first random access preamble message, and the second RNTI is determined based on a time and frequency resource of the second random access preamble message.