# US 2018/0323907 A1 · User terminal, radio base station and radio communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323907 A1 - Document ID: US20180323907A1 - Status: Published application - Kind: A1 - Application number: 15/773,287 - Filed: 2016-11-04 - Published: 2018-11-08 - Earliest claimed: 2015-11-05 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo, Inc. - Inventors: Kazuki Takeda; Satoshi Nagata; Lihui Wang; Liu Liu; Huiling Jiang - Web page: https://patentgrep.com/patent/US20180323907A1 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/1469: {using time-sharing} - H04W 28/04: Error control - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 72/04: Wireless resource allocation - H04W 72/12: Wireless traffic scheduling - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A user terminal includes: a transmitter that transmits delivery acknowledgement signals (HARQ-ACKs); a receiver that receives downlink control information including: in one or more predetermined subframes of the downlink control information, first information that indicates a total number of cells to be subjected to downlink (DL) transmission scheduling, and second information that indicates a cumulative number of cells; and a processor that performs control so that the HARQ-ACKs are transmitted in predetermined uplink (UL) subframes based on the first information and the second information. The HARQ-ACKs are transmitted in response to DL signals transmitted from a plurality of cells. The plurality of cells include cells that use Time Division Duplex (TDD). A value of the first information is the same in each of the one or more predetermined subframes, and the processor updates the first information on a per subframe basis. ## Claims ### Claim 1 A user terminal comprising: a transmitter that transmits delivery acknowledgement signals (HARQ-ACKs), wherein: the HARQ-ACKs are transmitted in response to downlink (DL) signals transmitted from a plurality of cells, and the plurality of cells include cells that use Time Division Duplex (TDD); a receiver that receives downlink control information comprising: first information that indicates a total number of cells to be subjected to DL transmission scheduling in one or more predetermined subframes, and second information, indicating a accumulative that indicates a cumulative number of the cells, in downlink control information; and a processor that performs control so that the HARQ-ACKs are transmitted in predetermined uplink (UL) subframes based on the first information and the second information, wherein a value of the first information is the same in each of the one or more predetermined subframes, and wherein the processor updates the first information on a per subframe basis. ### Claim 2 (depends on 1) The user terminal according to claim 1, wherein the processor further determines a codebook size of the HARQ-ACKs based on the first information in a last subframe in which one of the DL signals is received, and the last subframe in which one of the DL signals is received is among the one or more predetermined subframes. ### Claim 3 (depends on 1) The user terminal according to claim 1, wherein, for cells that are subjected to DL transmission scheduling, the second information is numbered based on an order of cell indices and an order of subframes subject to DL transmission. ### Claim 4 (depends on 1) The user terminal according to claim 1, wherein the processor further selects resources for allocating the HARQ-ACKs based on a Transmission Protocol Control (TPC) field included in a last subframe among the one or more predetermined subframes. ### Claim 5 (depends on 1) The user terminal according to claim 1, wherein: the processor further determines HARQ-ACKs for each bit position in a codebook based on the second information, and the size of the codebook is determined based on the first information. ### Claim 6 (depends on 5) The user terminal according to claim 5, wherein the processor determines that a HARQ-ACK value in the codebook for a cell where the second information is not detected is a negative acknowledgement (NACK), and the cell is among the total number of cells to be subjected to DL transmission scheduling. ### Claim 7 (depends on 1) The user terminal according to claim 1, wherein the control section determines a Physical Uplink Control Channel (PUCCH) format based on the first information. ### Claim 8 (depends on 1) The user terminal according to claim 1, wherein the first information is configured in a bit field that defines a total downlink assignment indication (DAI), and the second information is configured in a bit field that defines a counter DAI. ### Claim 9 A radio base station that communicates with a user terminal that can use a plurality of cells that include cells that use Time Division Duplex (TDD), the radio base station comprising: a transmitter that transmits downlink control information comprising: first information that indicates a total number of cells to be subjected to DL transmission scheduling in one or more predetermined subframes, and second information that indicates a cumulative number of the cells; and a receiver that receives delivery acknowledgement signals (HARQ-ACKs) transmitted from the user terminal based on the first information and the second information, wherein the first information is configured on a per subframe basis, and wherein a value of the first information is the same in each of the one or more predetermined subframes. ### Claim 10 A radio communication method for a user terminal that communicates with a radio base station, the radio communication method comprising: transmitting delivery acknowledgement signals (HARQ-ACKs) in response to downlink (DL) signals transmitted from a plurality of cells, wherein the plurality of cells include cells that use Time Division Duplex (TDD); receiving downlink control information comprising: first information that indicates a total number of cells to be subjected to DL transmission scheduling in one or more predetermined subframes, and second information that indicates a cumulative number of the cells; and performing control to transmit the HARQ-ACKs in predetermined uplink (UL) subframes based on the first information and the second information, wherein a value of the first information is the same in each of the one or more predetermined subframes, and wherein the first information is updated on a per subframe basis. ### Claim 11 (depends on 2) The user terminal according to claim 2, wherein, for cells that are subjected to DL transmission scheduling, the second information is numbered based on an order of cell indices and an order of subframes subject to DL transmission. ### Claim 12 (depends on 2) The user terminal according to claim 2, wherein the processor further selects resources for allocating the HARQ-ACKs based on a Transmission Protocol Control (TPC) field included in a last subframe among the one or more predetermined subframes. ### Claim 13 (depends on 3) The user terminal according to claim 3, wherein the processor further selects resources for allocating the HARQ-ACKs based on a Transmission Protocol Control (TPC) field included in a last subframe among the one or more predetermined subframes. ### Claim 14 (depends on 2) The user terminal according to claim 2, wherein: the processor further determines HARQ-ACKs for each bit position in a codebook based on the second information, and the size of the codebook is determined based on the first information. ### Claim 15 (depends on 3) The user terminal according to claim 3, wherein: the processor further determines HARQ-ACKs for each bit position in a codebook based on the second information, and the size of the codebook is determined based on the first information. ### Claim 16 (depends on 4) The user terminal according to claim 4, wherein: the processor further determines HARQ-ACKs for each bit position in a codebook based on the second information, and the size of the codebook is determined based on the first information. ### Claim 17 (depends on 2) The user terminal according to claim 2, wherein the processor determines that a HARQ-ACK value in the codebook for a cell where the second information is not detected is a negative acknowledgement (NACK), and the cell is among the total number of cells to be subjected to DL transmission scheduling. ### Claim 18 (depends on 3) The user terminal according to claim 3, wherein the processor determines that a HARQ-ACK value in the codebook for a cell where the second information is not detected is a negative acknowledgement (NACK), and the cell is among the total number of cells to be subjected to DL transmission scheduling. ### Claim 19 (depends on 4) The user terminal according to claim 4, wherein the processor determines that a HARQ-ACK value in the codebook for a cell where the second information is not detected is a negative acknowledgement (NACK), and the cell is among the total number of cells to be subjected to DL transmission scheduling. ### Claim 20 (depends on 5) The user terminal according to claim 5, wherein the processor determines that a HARQ-ACK value in the codebook for a cell where the second information is not detected is a negative acknowledgement (NACK), and the cell is among the total number of cells to be subjected to DL transmission scheduling.