TECHNICAL FIELD

An aspect of the present invention relates to a terminal apparatus, a base station apparatus, and a communication method. The present application claims priority to Japanese Patent Application No. 2018-001724, which is a Japanese patent application filed on Jan. 10, 2018, the contents of which are incorporated herein by reference in their entirety.

BACKGROUND ART

In the 3rdGeneration Partnership Project (3GPP), a radio access method and a radio network for cellular mobile communications (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) have been studied. In LTE, a base station apparatus is also referred to as an evolved NodeB (eNodeB), and a terminal apparatus is also referred to as user equipment (UE). LTE is a cellular communication system in which multiple areas are deployed in a cell structure, with each of the multiple areas being covered by a base station apparatus. A single base station apparatus may manage multiple serving cells.

3GPP has been studying a next generation standard (New Radio or NR) (NPL 1) to make a proposal for International Mobile Telecommunication (IMT)-2020, a standard for a next-generation mobile communication system, standardized by the International Telecommunication Union (ITU). NR is required to satisfy requirements for three scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) in a single technology framework.

CITATION LIST

Non Patent Literature

NPL 1: “New SID proposal: Study on New Radio Access Technology”, RP-160671, NTT docomo, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7 to 10 Mar. 2016.

SUMMARY OF INVENTION

Technical Problem

One aspect of the present invention provides a terminal apparatus capable of efficiently performing communication, a communication method used for the terminal apparatus, a base station apparatus capable of efficiently performing communication, and a communication method used for the base station apparatus.

Solution to Problem

(1) According to a first aspect of the present invention, the following measures are provided. Specifically, the first aspect of the present invention is a terminal apparatus including: a receiver configured to monitor a PDCCH including a DCI format, and a transmitter configured to transmit an HARQ-ACK on a PUCCH, wherein the terminal apparatus receives a first transport block included in a PDSCH scheduled by the DCI format, the HARQ-ACK is given at least based on a first HARQ-ACK bit corresponding to the first transport block and a second HARQ-ACK bit corresponding to a second transport block, the transmitter generates the second HARQ-ACK bit at least based on some or all of 1) whether at least one serving cell in M PDCCH monitoring occasions includes at least one monitoring occasion for a search space set configured with monitoring of the DCI format or not, 2) a higher layer parameter Number-MCS-HARQ-DL-DCI is set to a prescribed value for the at least one serving cell or not, and/or 3) a value of a higher layer parameter HARQ-ACK-spatial-bundling-PUCCH.

(2) A second aspect of the present invention is a base station apparatus including: a transmitter configured to transmit a PDCCH including a DCI format, and a receiver configured to receive an HARQ-ACK on a PUCCH, wherein the terminal apparatus transmits a first transport block included in a PDSCH scheduled by the DCI format, the HARQ-ACK is given at least based on a first HARQ-ACK bit corresponding to the first transport block and a second HARQ-ACK bit corresponding to a second transport block, the receiver receives the HARQ-ACK at least based on some or all of 1) whether at least one serving cell in M PDCCH monitoring occasions includes at least one monitoring occasion for a search space set configured with monitoring of the DCI format or not, 2) a higher layer parameter Number-MCS-HARQ-DL-DCI is set to a prescribed value for the at least one serving cell or not, and/or 3) a value of a higher layer parameter HARQ-ACK-spatial-bundling-PUCCH.

(3) A third aspect of the present invention is a communication method used for a terminal apparatus, the communication method including the steps of: monitoring a PDCCH including a DCI format, transmitting an HARQ-ACK on a PUCCH, receiving a first transport block included in a PDSCH scheduled by the DCI format, giving the HARQ-ACK at least based on a first HARQ-ACK bit corresponding to the first transport block and a second HARQ-ACK bit corresponding to a second transport block, and generating the second HARQ-ACK bit at least based on some or all of 1) whether at least one serving cell in M PDCCH monitoring occasions includes at least one monitoring occasion for a search space set configured with monitoring of the DCI format or not, 2) a higher layer parameter Number-MCS-HARQ-DL-DCI is set to a prescribed value for the at least one serving cell or not, and/or 3) a value of a higher layer parameter HARQ-ACK-spatial-bundling-PUCCH.

(4) A fourth aspect of the present invention is a communication method used for a base station apparatus, the communication method including the steps of: transmitting a PDCCH including a DCI format, receiving an HARQ-ACK on a PUCCH, transmitting a first transport block included in a PDSCH scheduled by the DCI format, giving the HARQ-ACK at least based on a first HARQ-ACK bit corresponding to the first transport block and a second HARQ-ACK bit corresponding to a second transport block, and receiving the HARQ-ACK at least based on some or all of 1) whether at least one serving cell in M PDCCH monitoring occasions includes at least one monitoring occasion for a search space set configured with monitoring of the DCI format or not, 2) a higher layer parameter Number-MCS-HARQ-DL-DCI is set to a prescribed value for the at least one serving cell or not, and/or 3) a value of a higher layer parameter HARQ-ACK-spatial-bundling-PUCCH.

(5) A fifth aspect of the present invention is a terminal apparatus including: a receiver configured to receive a PDCCH including a DCI format; and a transmitter configured to transmit a PUCCH, wherein in a case that the DCI format schedules a PDSCH and that a last OFDM symbol of the PDSCH is mapped in a first slot, the PUCCH is transmitted in a second slot, the number of slots from the first slot to the second slot is given based on a PDSCH-to-HARQ-timing-indicator field, and a length of each of the slots is given based on a subcarrier spacing configuration of the PUCCH.

(6) A sixth aspect of the present invention is a base station apparatus including: a transmitter configured to transmit a PDCCH including a DCI format; and a receiver configured to receive a PUCCH, wherein in a case that the DCI format schedules a PDSCH and that a last OFDM symbol of the PDSCH is mapped in a first slot, the PUCCH is transmitted in a second slot, the number of slots from the first slot to the second slot is given based on a PDSCH-to-HARQ-timing-indicator field, and a length of each of the slots is given based on a subcarrier spacing configuration of the PUCCH.

(7) A seventh aspect of the present invention is a communication method used for a terminal apparatus, the communication method including the steps of: receiving a PDCCH including a DCI format, and transmitting a PUCCH, wherein in a case that the DCI format schedules a PDSCH and that a last OFDM symbol of the PDSCH is mapped in a first slot, the PUCCH is transmitted in a second slot, the number of slots from the first slot to the second slot is given based on a PDSCH-to-HARQ-timing-indicator field, and a length of each of the slots is given based on a subcarrier spacing configuration of the PUCCH.

(8) An eighth aspect of the present invention is a communication method used for a base station apparatus, the communication method including the steps of: transmitting a PDCCH including a DCI format; and receiving a PUCCH, wherein in a case that the DCI format schedules a PDSCH and that a last OFDM symbol of the PDSCH is mapped in a first slot, the PUCCH is transmitted in a second slot, the number of slots from the first slot to the second slot is given based on a PDSCH-to-HARQ-timing-indicator field, and a length of each of the slots is given based on a subcarrier spacing configuration of the PUCCH.

Advantageous Effects of Invention

According to one aspect of the present invention, the terminal apparatus can efficiently perform communication. In addition, the base station apparatus can efficiently perform communication.

