User terminal, base station and radio communication method

• US 10,462,781 B2
• Filed: 09/22/2014
• Issued: 10/29/2019
• Est. Priority Date: 09/26/2013
• 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, Harada, Hiroki, Nagata, Satoshi, Ishii, Hiroyuki
• Primary Examiner(s): Elpenord, Candal
• Application Number:
  US15/024,896
• Publication Number:
  US 20160242158A1
• Time in Patent Office: 1,863 Days
• Field of Search: None
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• 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 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention is designed to carry out uplink transmission adequately even when CA is executed by applying different duplex modes between multiple cells. A user terminal communicates with an FDD cell and a TDD cell that employ carrier aggregation, and has a receiving section that receives DL signals transmitted from each cell, and a feedback control section that allocates and feeds back delivery acknowledgement signals in response to the DL signals in a predetermined UL subframe, and, regardless of which cell is configured as a primary cell, the feedback control section, when transmitting only a delivery acknowledgement signal in response to the DL signal of one cell, transmits the delivery acknowledgement signal from the one cell by using a PUCCH resource that is determined from a downlink control channel resource of the DL signal, and, when transmitting delivery acknowledgement signals in response to the DL signals of both cells, transmits the delivery acknowledgement signals by using a PUCCH resource of one or both of the cells.

Claims

1. A user terminal that communicates with a primary cell and at least one secondary cell that are supported by different duplex modes, the user terminal comprising:

a receiver that receives a downlink (DL) signal transmitted from each of the cells;

a transmitter that transmits a delivery acknowledgement signal for the DL signal by using an uplink control channel of a given secondary cell of the at least one secondary cell; and

a processor that controls transmission power of the uplink control channel of the given secondary cell,

wherein the processor applies a transmission power control (TPC) command included in downlink control information of the given secondary cell for power control of the uplink control channel of the given secondary cell, irrespective of whether there is DL allocation in the primary cell and the given secondary cell or not,

wherein bits from the TPC command are jointly coded with other TPC commands, and

wherein the transmitter transmits the delivery acknowledgement signal by using an uplink control channel resource which is reported to the user terminal by higher layer signaling.

2. The user terminal according to claim 1, wherein the processor does not apply the TPC command included in the downlink control information of the given secondary cell transmitting the uplink control channel, for resource designation to transmit an uplink control channel in the primary cell.

3. The user terminal according to claim 1, wherein carrier aggregation is performed using the primary cell and the given secondary cell.

4. The user terminal according to claim 2, wherein carrier aggregation is performed using the primary cell and the given secondary cell.

5. A radio base station that communicates with a user terminal using a primary cell and at least one secondary cell that are supported by different duplex, the radio base station comprising:

a transmitter that transmits a downlink (DL) signal; and

a receiver that receives a delivery acknowledgement signal transmitted for the DL signal from the user terminal,

wherein the transmitter transmits downlink control information of a given secondary cell of the at least one secondary cell including a transmission power control (TPC) command, irrespective of whether there is DL allocation in the primary cell and the given secondary cell or not,

wherein bits from the TPC command are jointly coded with other TPC commands, and wherein the radio base station reports an uplink control channel resource to the user terminal by higher layer signaling, and the receiver receives the delivery acknowledgement signal in the uplink control channel resource.

6. A radio communication method for a user terminal that communicates with a primary cell and at least one secondary cell that are supported by different duplex modes and are formed by a same radio base station, the radio communication method comprising:

receiving downlink (DL) signals transmitted from each of the cells;

transmitting a delivery acknowledgement signal for the DL signals by using an uplink control channel of a given secondary cell of the at least one secondary cell; and

controlling transmission power of the uplink control channel of the given secondary cell, wherein a transmission power control (TPC) command included in downlink control information of the given secondary cell is applied for power control of the uplink control channel of the given secondary cell, irrespective of whether there is DL allocation in the primary cell and the given secondary cell or not,

wherein bits from the TPC command are jointly coded with other TPC commands, and

wherein the delivery acknowledgement signal is transmitted by using an uplink control channel resource which is reported to the user terminal by higher layer signaling.