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EP-4742736-A1 - TERMINAL, WIRELESS COMMUNICATION METHOD, AND BASE STATION

EP4742736A1EP 4742736 A1EP4742736 A1EP 4742736A1EP-4742736-A1

Abstract

A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration of a plurality of channel state information (CSI)-reference signal (RS) resources, and a control section that measures the plurality of CSI-RS resources by using more than 32 CSI-RS ports. The plurality of CSI-RS resources are associated with 32 or less different CSI-RS ports.

Inventors

  • MATSUMURA, YUKI
  • NAGATA, SATOSHI
  • WANG, JING

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260513
Application Date
20230705

Claims (6)

  1. A terminal comprising: a receiving section that receives a configuration of a plurality of channel state information (CSI)-reference signal (RS) resources; and a control section that measures the plurality of CSI-RS resources by using more than 32 CSI-RS ports, wherein the plurality of CSI-RS resources are associated with 32 or less different CSI-RS ports.
  2. The terminal according to claim 1, wherein an i-th CSI-RS resource of the plurality of CSI-RS resources is associated with CSI-RS ports of port numbers (i-1)x to ix-1, where i is an integer of 1 or greater, and x is an integer of 1 or greater and 32 or less.
  3. The terminal according to claim 1, wherein the plurality of CSI-RS resources are associated with at least one of a same CSI-RS resource set and a same configured value.
  4. The terminal according to claim 1, wherein at least one of density, a scramble ID different from an existing scramble ID, the number of physical resource blocks (PRBs), and a starting PRB is configured for the plurality of CSI-RS resources.
  5. A radio communication method for a terminal, the radio communication method comprising: receiving a configuration of a plurality of channel state information (CSI)-reference signal (RS) resources; and measuring the plurality of CSI-RS resources by using more than 32 CSI-RS ports, wherein the plurality of CSI-RS resources are associated with 32 or less different CSI-RS ports.
  6. A base station comprising: a transmitting section that transmits a configuration of a plurality of channel state information (CSI)-reference signal (RS) resources; and a control section that associates the plurality of CSI-RS resources with more than 32 CSI-RS ports, wherein the plurality of CSI-RS resources are associated with 32 or less different CSI-RS ports.

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, NR), it is studied that a terminal (User Equipment (UE)) controls transmission and reception processing, based on information related to quasi-co-location (QCL, a Transmission Configuration Indication (TCI) state, a beam). However, when many periodic/semi-persistent channel state information-reference signals (CSI-RSs) are configured for management of many beams, resource use efficiency is reduced, and reduction in throughput and the like may be caused. In view of this, the present disclosure has one object to provide a terminal, a radio communication method, and a base station that efficiently use CSI-RS resources. Solution to Problem A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration of a plurality of channel state information (CSI)-reference signal (RS) resources, and a control section that measures the plurality of CSI-RS resources by using more than 32 CSI-RS ports. The plurality of CSI-RS resources are associated with 32 or less different CSI-RS ports. Advantageous Effects of Invention According to one aspect of the present disclosure, CSI-RS resources can be efficiently used. Brief Description of Drawings [FIG. 1] FIG. 1 is a diagram to show an example of CSI-RS locations in a slot.[FIG. 2] FIG. 2A to FIG. 2D are diagrams to show examples of an FD-OCC and a TD-OCC.[FIG. 3] FIG. 3 is a diagram to show an example of CSI-RS locations for each number of ports.[FIG. 4] FIG. 4 is a diagram to show an example of mapping of a CSI-RS having 32 ports.[FIG. 5] FIG. 5A and FIG. 5B are diagrams to show examples of the CSI-RS to which an inter-PRB OCC is applied.[FIG. 6] FIG. 6A to FIG. 6C are diagrams to show examples of the inter-PRB OCC.[FIG. 7] FIG. 7A and FIG. 7B are diagrams to show examples of overlapping of a previous-release CSI-RS and a new-release CSI-RS.[FIG. 8] FIG. 8 is a diagram to show an example of CSI-RS measurement operation of a UE not configured with the inter-PRB OCC.[FIG. 9] FIG. 9 is a diagram to show an example of the CSI-RS to which an inter-slot OCC is applied.[FIG. 10] FIG. 10 is a diagram to show an example of legacy CSI-RS resources and additional CSI-RS resources.[FIG. 11] FIG. 11 is a diagram to show an example of an additional OCC applied over the legacy CSI-RS resources and the additional CSI-RS resources.[FIG. 12] FIG. 12 is a diagram to show an example of a case in which at least one of time and frequency is different between the legacy CSI-RS resources and the additional CSI-RS resources.[FIG. 13] FIG. 13 is a diagram to show an example of a case in which at least one of a sequence and a scramble ID is different between the legacy CSI-RS resources and the additional CSI-RS resources.[FIG. 14] FIG. 14 shows an example of beam application timing 1.[FIG. 15] FIG. 15 shows an example of application timing of CSI-RS resources.[FIG. 16] FIG. 16 is a diagram to show an example of a schematic structure of a radio communication system according to one embodiment.[FIG. 17] FIG. 17 is a diagram to show an example of a structure of a base station according to one embodiment.[FIG. 18] FIG. 18 is a diagram to show an example of a structure of a user terminal according to one embodiment.[FIG. 19] FIG. 19 is a diagram to show an example of a hardware structure of the base station and the user terminal according to one embodiment.[FIG. 20] FIG. 20 is a diagram to show an example of a vehicle according to one embodiment. Description of Embodiments (CSI Report (or Reporting)) In Rel-15 NR, a terminal (also referred to as a user terminal, a User Equipment (UE), and the like) generates (also referred to as determines, calculates, estimates, mea