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EP-3713172-B1 - USER TERMINAL AND WIRELESS COMMUNICATION METHOD

EP3713172B1EP 3713172 B1EP3713172 B1EP 3713172B1EP-3713172-B1

Inventors

  • MATSUMURA, YUKI
  • TAKEDA, KAZUKI
  • NAGATA, SATOSHI

Dates

Publication Date
20260506
Application Date
20171117

Claims (4)

  1. A terminal (20) comprising: a control section (401) configured to determine, based on a radio resource control, RRC, signaling and downlink control information, DCI, which one to use from: a first configuration of transmitting first uplink control information, UCI, and second UCI by using a same frequency resource, and a second configuration of transmitting the first UCI and the second UCI by using mutually different frequency resources; determine a resource to transmit the first UCI or the second UCI based on the first configuration or the second configuration that is determined to be used; and a transmitting section (203) configured to transmit the first UCI or the second UCI by using the resource; wherein the first UCI includes a positive scheduling request, SR, and a Hybrid Automatic Repeat request-Acknowledgement, HARQ-ACK, wherein the second UCI includes a negative SR and a HARQ-ACK, wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 1-bit HARQ-ACK, the transmitting section (203) uses 3 or 9 as an index for cyclic shift to apply to the first UCI and the transmitting section (203) uses 0 or 6 as an index for cyclic shift to apply to the second UCI, and wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 2-bit HARQ-ACK, the transmitting section (203) uses 1, 4, 7 or 10 as an index for cyclic shift to apply to the first UCI and the transmitting section (203) uses 0, 3, 6 or 9 as an index for cyclic shift to apply to the second UCI.
  2. A radio communication method for a terminal (20), the method comprising: determining, based on a radio resource control, RRC, signaling and downlink control information, DCI, which one to use from: a first configuration of transmitting first uplink control information, UCI, and second UCI by using a same frequency resource, and a second configuration of transmitting the first UCI and the second UCI by using mutually different frequency resources; determining a resource to transmit the first UCI or the second UCI based on the first configuration or the second configuration that is determined to be used; and transmitting the first UCI or the second UCI by using the resource; wherein the first UCI includes a positive scheduling request, SR, and a Hybrid Automatic Repeat request-Acknowledgement, HARQ-ACK, wherein the second UCI includes a negative SR and a HARQ-ACK, wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 1-bit HARQ-ACK, the transmitting section uses 3 or 9 as an index for cyclic shift to apply to the first UCI and the transmitting section uses 0 or 6 as an index for cyclic shift to apply to the second UCI, and wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 2-bit HARQ-ACK, the transmitting section (203) uses 1, 4, 7 or 10 as an index for cyclic shift to apply to the first UCI and the transmitting section (203) uses 0, 3, 6 or 9 as an index for cyclic shift to apply to the second UCI.
  3. A base station (10) comprising: a transmitting section (103) configured to transmit, to a terminal (20) a radio resource control, RRC, signaling and downlink control information, DCI, about which one to use from: a first configuration of transmitting first uplink control information, UCI, and second UCI by using a same frequency resource, and a second configuration of transmitting the first UCI and the second UCI by using mutually different frequency resources; and a receiving section (103) configured to receive the first UCI or the second UCI transmitted by using a resource based on the first configuration or the second configuration that is determined to be used by the terminal (20); wherein the first UCI includes a positive scheduling request, SR, and a Hybrid Automatic Repeat request-Acknowledgement, HARQ-ACK, wherein the second UCI includes a negative SR and a HARQ-ACK, wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 1-bit HARQ-ACK, the transmitting section uses 3 or 9 as an index for cyclic shift to apply to the first UCI and the transmitting section uses 0 or 6 as an index for cyclic shift to apply to the second UCI, and wherein in the first configuration, when the HARQ-ACK included in the first UCI and the second UCI are each 2-bit HARQ-ACK, the transmitting section (203) uses 1, 4, 7 or 10 as an index for cyclic shift to apply to the first UCI and the transmitting section (203) uses 0, 3, 6 or 9 as an index for cyclic shift to apply to the second UCI.
  4. A system (1) comprising the terminal (20) according to claim 1 and the base station (10) according to claim 3.

Description

Technical Field The present disclosure relates to a user terminal and a radio communication method in next-generation mobile communication systems. Background Art In the UMTS (Universal Mobile Telecommunications System) network, the specifications of Long Term Evolution (LTE) have been drafted for the purpose of further increasing high speed data rates, providing lower latency and so on (see Non-Patent Literature 1). For the purpose of further high capacity, advancement of LTE (LTE Rel. 8, Rel. 9), and so on, the specifications of LTE-A (LTE-Advanced, LTE Rel. 10, Rel. 11, Rel. 12, Rel. 13) have been drafted. Successor systems of LTE (referred to as, for example, "FRA (Future Radio Access)," "5G (5th generation mobile communication system)," "5G+ (plus)," "NR (New Radio)," "NX (New radio access)," "FX (Future generation radio access)," "LTE Rel. 14," "LTE Rel. 15" (or later versions), and so on) are also under study. In the existing LTE systems (for example, LTE Rel. 8 to Rel. 13), a user terminal (UE (User Equipment)) transmits, for example, uplink control information (UCI) by use of a UL control channel (for example, PUCCH (Physical Uplink Control Channel)). The UCI may include, for example, retransmission control information for DL data (also referred to as HARQ-ACK, ACK/NACK, A/N, and the like), scheduling request (SR), CSI (for example, periodic CSI (P-CSI), aperiodic CSI (A-CSI), and the like). Citation List WO 2011/019795 A1relates to a method for transmitting scheduling requests in an LTE Advanced system. Scheduling requests may be superimposed on HARQ ACK/NACK by multiplying the HARQ ACK/NACK by a value. Alternatively, scheduling requests may be channel-coded and multiplexed with other uplink control information. 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 INTEL CORPORATION: "Short PUCCH for UCI up to 2 bits", 8 October 2017 relates to various design aspects of sequence based 1-symbol short PUCCH carrying 1-2 UCI bit(s). Summary of Invention Technical Problem For future radio communication systems (for example, NR), a study is underway to use a format different from an existing UL control channel structure (UL control channel format). However, a study is not still sufficiently made on a new format concerning what radio resources (frequency, time and/or code resource) is used for transmission. If resources appropriate to UCI transmission is not employed, degradation in communication throughput, frequency use efficiency, and the like may occur. Then, an object of the present disclosure is to provide a user terminal and a radio communication method which can suppress reduction in communication throughput and the like even if a new UL control channel is used to transmit UCI. Solution to Problem The object of the invention is achieved by the subject-matter of the independent claims. Advantageous embodiments are defined in the dependent claims. Further examples are provided for facilitating the understanding of the invention. A user terminal according to one aspect of the present disclosure includes a transmitting section that transmits first uplink control information (UCI) including a positive scheduling request (SR) or second UCI including a negative SR using a certain resource, and a control section that, in order to specify the certain resource, determines to use which of a first configuration and a second configuration, the first configuration being for transmitting the first UCI and the second UCI using the same frequency resource, the second configuration being for transmitting the first UCI and the second UCI using different frequency resources. Advantageous Effects of Invention According to one aspect of the present disclosure, reduction in communication throughput and the like can be suppressed even if a new UL control channel is used to transmit UCI. Brief Description of Drawings FIG. 1 is a diagram to show an example of one or a plurality of candidates of CS amounts (phase rotation amounts) assigned to a UE;FIGS. 2A and 2B are diagrams to show examples of a radio resource for a UCI transmission according to a first embodiment;FIGS. 3A and 3B are diagrams to show other examples of the radio resource for the UCI transmission according to the first embodiment;FIG. 4 is a diagram to show an example of a schematic structure of a radio communication system according to one embodiment;FIG. 5 is a diagram to show an example of an overall structure of a radio base station according to one embodiment;FIG. 6 is a diagram to show an example of a functional structure of the radio base station according to one embodiment;FIG. 7 is a diagram to show an example of an overall structure of a user terminal according to one embodiment;FIG. 8 is a diagram to show an example of a functional structure of the user term