USER TERMINAL, RADIO BASE STATION AND RADIO COMMUNICATION METHOD

• US 20180212742A1
• Filed: 03/23/2018
• Published: 07/26/2018
• Est. Priority Date: 09/24/2015
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Takeda, Kazuki, Uchino, Tooru, Teshima, Kunihiko, Nagata, Satoshi
• Granted Patent: US 10,530,554 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 88/023 with message or information receiving capability
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A user terminal is disclosed including a transmitter that communicates with a first cell group (CG) including a first secondary cell (Scell) and transmits uplink control information using an uplink control channel of the first Scell. The user terminal includes a processor that deactivates the first Scell within a predetermined period from a subframe in which a deactivation command for the first Scell is reported or a subframe in which a deactivation timer applied to the first Scell expires.

Claims

1. A user terminal comprising:

a transmitter that;

communicates with a first cell group (CG) including a first secondary cell (Scell); and

transmits uplink control information using an uplink control channel of the first Scell; and

a processor that deactivates the first Scell within a predetermined period from a subframe in which a deactivation command for the first Scell is reported or a subframe in which a deactivation timer applied to the first Scell expires.

2. The user terminal according to claim 1,

wherein the first CG includes a second Scell, and

wherein the processor does not cause the transmitter to perform channel state information (CSI) reporting in the second Scell at or before a time when the first Scell is deactivated.

3. The user terminal according to claim 1,

wherein the first CG includes a second Scell, and

wherein, when the deactivation command for the first Scell is reported, the processor deactivates the second Scell.

4. The user terminal according to claim 1, wherein, when the deactivation command reported to a certain Scell or the deactivation timer applied to the certain Scell expires, if a cell that transmits an uplink control channel in a CG including the Scell is in an active state in a subframe a predetermined period later, the processor causes the transmitter to perform CSI reporting of the Scell.

5. The user terminal according to claim 1,

wherein the transmitter communicates with a second CG including a primary cell (Pcell) and a third Scell,

wherein the transmitter transmits an uplink control channel using the Pcell, and

wherein, when the deactivation command for the third Scell is reported or the deactivation timer applied to the third Scell expires, the processor causes the transmitter to perform CSI reporting of the third Scell in a predetermined subframe regardless of the timing of the third Scell being deactivated.

8. The user terminal according to claim 2, wherein, when the deactivation command for a certain Scell reported or the deactivation timer applied to the certain Scell expires, if a cell that transmits an uplink control channel in a CG including the Scell is in an active state in a subframe a predetermined period later, the processor causes the transmitter to perform CSI reporting of the Scell.

9. The user terminal according to claim 3, wherein, when the deactivation command for a certain Scell reported or the deactivation timer applied to the certain Scell expires, if a cell that transmits an uplink control channel in a CG including the Scell is in an active state in a subframe a predetermined period later, the processor causes the transmitter to perform CSI reporting of the Scell.

10. The user terminal according to claim 2,

wherein the transmitter communicates with a second CG including a primary cell (Pcell) and a third Scell,

wherein the transmitter transmits an uplink control channel using the Pcell, and

wherein, when the deactivation command for the third Scell is reported or the deactivation timer applied to the third Scell expires, the processor causes the transmitter to perform CSI reporting of the third Scell in a predetermined subframe regardless of the timing of the third Scell being deactivated.

11. The user terminal according to claim 3,

wherein the transmitter communicates with a second CG including a primary cell (Pcell) and a third Scell,

wherein the transmitter transmits an uplink control channel using the Pcell, and

wherein, when the deactivation command for the third Scell is reported or the deactivation timer applied to the third Scell expires, the processor causes the transmitter to perform CSI reporting of the third Scell in a predetermined subframe regardless of the timing of the third Scell being deactivated.

6. A radio base station comprising:

a receiver that;

communicates with a user terminal connected with a cell group (CG) including a first secondary cell (Scell); and

receives uplink control information transmitted from the user terminal in an uplink control channel of the first Scell; and

a transmitter that transmits a deactivation command for the first Scell,

wherein the first Scell is deactivated in the user terminal within a predetermined period from a subframe in which the deactivation command for the first Scell is transmitted.

7. A radio communication method for a user terminal, the method comprising:

transmitting uplink control information using an uplink control channel of a first secondary cell (Scell) in a cell group (CG); and

deactivating the first Scell within a predetermined period from a subframe in which a deactivation command for the first Scell is reported or a subframe in which a deactivation timer applied to the first Scell expires.