BR-112020007888-B1 - TERMINAL AND RADIOCOMMUNICATION METHOD FOR A TERMINAL

Abstract

A user terminal according to the present invention includes: a transmission section that transmits Uplink Control Information (UCI) including at least one retransmission control information for a downlink data channel, a Scheduling Request (SR), and Channel State Information (CSI); and a control section that controls the transmission of UCIs when a first uplink control channel and a second uplink control channel having a longer duration than that of the first uplink control channel are subjected to time-division multiplexing in one or more slots.

Inventors

• Kazuki Takeda
• Satoshi Nagata
• Lihui Wang
• Xiaolin Hou

Assignees

• NTT DOCOMO, INC

Dates

Publication Date

20260317

Application Date

20171023

Claims (4)

1. 1. Terminal (20) characterized in that it comprises: a transmission section (203) configured to transmit uplink control information, UCI, including at least one of a Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, a scheduling request, SR, and channel status information, CSI; and a control section (401) configured to, when an uplink control channel for the UCI overlaps with an uplink shared channel, punch an uplink data transmitted on the uplink shared channel and control the transmission of the UCI using the uplink shared channel based on an initial timing of the uplink control channel.
2. 2. Terminal (20), according to claim 1, characterized in that the control section (401) is configured to determine the initial timing of the uplink control channel based on downlink control information.
3. 3. Terminal (20), according to claim 1, characterized in that the control section (401) is configured to control the number of resources used for a UCI transmission based on information related to a beta offset transmitted by a radio resource control signal, RRC.
4. 4. Radio communication method for a terminal (20) characterized in that it comprises: transmitting uplink control information, UCI, including at least one of a Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, a scheduling request, SR, and channel status information, CSI; and when an uplink control channel for the UCI overlaps with a shared uplink channel, punching an uplink data transmitted on the shared uplink channel and controlling the transmission of the UCI using the shared uplink channel based on an initial timing of the uplink control channel.

Description

Technical field [001] The present invention relates to a user terminal and a radio communication method of a next-generation mobile communication system. Technical background [002] In Universal Mobile Telecommunications System (UMTS) networks, for the purpose of higher data rates and lower latency, Long Term Evolution (LTE) was specified (Non-Patent Literature 1). Furthermore, for the purpose of wider bandwidths and higher speeds than LTE, LTE successor systems (also known as LTE-Advanced (LTE-A), Future Radio Access (FRA), 4G, 5G, 5G+ (plus), New RAT (NR), or LTE Rel. 14, 15 and ~) were also studied. [003] Furthermore, legacy LTE systems (e.g., LTE Rel. 8 to 13) perform communication on the Downlink (DL) and/or Uplink (UL) using a subframe (also known as Transmission Time Intervals (TTI)) of 1 ms. The subframe is a unit of transmission time of a data packet encoded in 1 channel and is a unit of scheduling, link adaptation, or retransmission control processing (HARQ: Hybrid Automatic Repeat Request). [004] Furthermore, according to legacy LTE systems (e.g., LTE Rel. 8 to 13), a user terminal transmits Uplink Control Information (UCI) using an uplink control channel (e.g., a PUCCH: Physical Uplink Control Channel) or an uplink data channel (e.g., a PUSCH: Physical Uplink Shared Channel). An uplink control channel configuration (format) will be referred to as a PUCCH (PF) format. List of Citations Non-Patent Literature Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention Technical Problem [005] Legacy LTE systems (e.g., LTE Rel. 13 and earlier versions) support uplink control channels (e.g., LTE PUCCH formats 1 to 5) of a plurality of identical duration formats (e.g., 14 symbols in a general Cyclic Prefix (CP) case). On the other hand, it is assumed that future radiocommunication systems (e.g., LTE Rel. 14, 15 and ~, 5G and NR) will support uplink control channels of a plurality of formats whose durations are at least different. [006] For example, it has been studied for future radiocommunication systems to support a first uplink control channel (also referred to as short PUCCH or NR PUCCH 0 and/or 2 formats) of relatively short duration (e.g., 1 to 2 symbols) and a second uplink control channel (also known as long PUCCH or at least one of the NR PUCCH 1, 3 and 4 formats below) having a longer duration (e.g., 4 to 14 symbols) than that of the first uplink control channel. [007] Therefore, it is assumed that when uplink control channels of a plurality of formats whose durations are at least different are supported, UCI transmission control in legacy LTE systems (e.g., LTE Rel. 13 or earlier releases) that support only a plurality of uplink control channels of identical duration is not adequate. [008] The present invention was made in light of this point, and one of the objects of the present invention is to provide a user terminal and a radio communication method that can properly control UCI transmission when uplink control channels of a plurality of formats whose durations are at least different are supported. Solution to the problem [009] One aspect of a user terminal according to the present invention includes: a transmission section that transmits Uplink Control Information (UCI) including at least one of the retransmission control information for a downlink data channel, a scheduling request (SR) and Channel State Information (CSI); and a control section that controls the transmission of UCIs when a first uplink control channel and a second uplink control channel having a longer duration than that of the first uplink control channel are subject to time-division multiplexing in one or more slots. Advantageous Effects of the Invention [010] According to the present invention, it is possible to adequately control UCI transmission when uplink control channels of a plurality of formats whose durations are at least different are supported. Brief Description of the Figures [011] Figs. 1A and 1B are diagrams illustrating an example of an uplink control channel configuration in a future radio communication system. [012] Fig. 2 is a diagram illustrating an example of a PUCCH format in the future radiocommunication system. [013] Fig. 3 is a diagram illustrating an example of time-division multiplexing of a short PUCCH and a long PUCCH. [014] Fig. 4 is a diagram illustrating a first example of determining a PUCCH for HARQ-ACK according to a first aspect. [015] Fig. 5 is a diagram illustrating a second example of determining a PUCCH for HARQ-ACK according to the first aspect. [016] Fig. 6 is a diagram illustrating a third example of determining the PUCCH for HARQ-ACK according to the first aspect. [017] Figs. 7A and 7B are diagrams illustrating an example of configurations of a plurality of SRs according to a second aspect. [01