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EP-4742787-A1 - TERMINAL, WIRELESS COMMUNICATION METHOD, AND BASE STATION

EP4742787A1EP 4742787 A1EP4742787 A1EP 4742787A1EP-4742787-A1

Abstract

A terminal according to one aspect of the present disclosure includes a control section that generates a sequence based on a value of uplink data, and a transmitting section that transmits the sequence in an uplink channel without a demodulation reference signal.

Inventors

  • OKANO, Mayuko
  • SHIBAIKE, Naoya
  • ECHIGO, Haruhi

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260513
Application Date
20230707

Claims (6)

  1. A terminal comprising: a control section that generates a sequence based on a value of uplink data; and a transmitting section that transmits the sequence in an uplink channel without a demodulation reference signal.
  2. The terminal according to claim 1, wherein the transmitting section transmits the sequence in a state other than a radio resource control (RRC) connected state.
  3. The terminal according to claim 1, wherein the transmitting section transmits the sequence in one of a plurality of resources arranged periodically.
  4. The terminal according to claim 1, wherein transmission of the sequence involves frequency hopping.
  5. A radio communication method for a terminal, the radio communication method comprising: generating a sequence based on a value of uplink data; and transmitting the sequence in an uplink channel without a demodulation reference signal.
  6. A base station comprising: a receiving section that receives a sequence in an uplink channel without a demodulation reference signal; and a control section that judges a value of uplink data, based on the sequence.

Description

Technical Field The present disclosure relates to a terminal, a radio communication method, and a base station in next-generation mobile communication systems. Background Art In a Universal Mobile Telecommunications System (UMTS) 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). In addition, for the purpose of further high capacity, advancement and the like of the LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8 and Rel. 9), the specifications of LTE-Advanced (3GPP Rel. 10 to Rel. 14) have been drafted. Successor systems of LTE (for example, also referred to as "5th generation mobile communication system (5G)," "5G+ (plus)," "6th generation mobile communication system (6G)," "New Radio (NR)," "3GPP Rel. 15 (or later versions)," and so on) are also under study. Citation List 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 Invention Technical Problem For future radio communication systems (for example, Rel-18 NR or later versions), improvement of uplink (UL) performance is under study. Meanwhile, studies have not sufficiently been made on UL data coverage expansion and overhead reduction. Unless UL data transmission is performed appropriately, deterioration of throughput and communication quality may occur. Thus, an object of the present disclosure is to provide a terminal, a radio communication method, and a base station that improve performance of UL data transmission. Solution to Problem A terminal according to one aspect of the present disclosure includes a control section that generates a sequence based on a value of uplink data, and a transmitting section that transmits the sequence in an uplink channel without a demodulation reference signal. Advantageous Effects of Invention According to one aspect of the present disclosure, it is possible to improve performance of UL data transmission. Brief Description of Drawings [FIG. 1] FIG. 1A to FIG. 1E are diagrams to show examples of PUCCH formats.[FIG. 2] FIG. 2 is a diagram to show an example of PF 0.[FIG. 3] FIG. 3A to FIG. 3C are diagrams to show examples of a DMRS-based PUCCH and a sequence-based PUCCH.[FIG. 4] FIG. 4A to FIG. 4C show examples of association between a base sequence and transmitted information.[FIG. 5] FIG. 5A to FIG. 5C show examples of association between CS offsets and transmitted information.[FIG. 6] FIG. 6A to FIG. 6C show examples of association between a spreading code and transmitted information.[FIG. 7] FIG. 7 is a diagram to show an example of a schematic structure of a radio communication system according to one embodiment.[FIG. 8] FIG. 8 is a diagram to show an example of a structure of a base station according to one embodiment.[FIG. 9] FIG. 9 is a diagram to show an example of a structure of a user terminal according to one embodiment.[FIG. 10] FIG. 10 is a diagram to show an example of a hardware structure of the base station and the user terminal according to one embodiment.[FIG. 11] FIG. 11 is a diagram to show an example of a vehicle according to one embodiment. Description of Embodiments (PUCCH Format) In NR, a configuration for uplink control channel (for example, PUCCH) (also referred to as a format, a PUCCH format (PF), or the like) is used for transmission of uplink control information (UCI). For example, Rel-15 NR supports PF 0 to PF 4 as shown in FIG. 1A to FIG. 1E, respectively. Note that, in Rel. 17 or later versions, the terms of PFs to be described below are merely examples and different terms may be used. For example, PFs 0 and 1 are PFs used to transmit UCI with 2 or less bits (up to 2 bits). For example, the UCI may be at least one of delivery confirmation information (also referred to as Hybrid Automatic Repeat reQuest-Acknowledgement (HARQ-ACK), acknowledgement (ACK), negative-acknowledgement (NACK), or the like) and a scheduling request (SR). PF 0 can be allocated to 1 or 2 symbols, and thus is also referred to as a short PUCCH. On the other hand, PF 1 can be allocated to 4 to 14 symbols, and thus is also referred to as a long PUCCH or the like. PF 0 uses a cyclic shift (CS) depending on a value of the UCI to transmit a sequence obtained by a cyclic shift of a base sequence, and thus is also referred to as a sequence-based PUCCH. In PF 1, a plurality of user terminals may be code-division multiplexed (CDMed) in the same physical resource block (PRB) by time-domain block-wise spreading using at least one of a CS and a time domain (TD)-orthogonal cover code (OCC). PFs 0 and 1 may be mapped to 1 PRB. PFs 2 to 4 are PFs used to transmit UCI (for example, channel state information (CSI) or at least one of a CSI, a HARQ