# US 12,010,700 B2 · User terminal and radio communication method

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- Number: US 12,010,700 B2
- Document ID: US12010700B2
- Status: Granted
- Kind: B2
- Application number: 17/432,777
- Filed: 2019-02-22
- Published: 2022-01-06
- Granted: 2024-06-11
- Earliest claimed: 2019-02-22
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yuki Matsumura; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US12010700B2

## CPC

- H04B 7/06968: {using quasi-colocation [QCL] between signals}
- H04B 7/0602: {using antenna switching (H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24)}
- H04B 7/088: {using beam selection}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 72/1273: of downlink data flows
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0023: {Time-frequency-space}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A terminal is disclosed that includes: a control section that determines, in a case where conditions (1) and (2) below are both satisfied, a quasi-co-location (QCL) assumption of an aperiodic channel state information-reference signal (AP CSI-RS), based on a control resource set (CORESET) having a specific CORESET-ID in a latest slot in which one or more CORESETs are monitored, (1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP CSI-RS being less than a value of a period for a reported beam switch, and (2) in a symbol identical to a symbol of the AP-CSI-RS, there being no other downlink signals with indicated transmission configuration indication state (TCI state) or there being other downlink signals without the indicated TCI state; and a receiving section that receives the AP-CSI-RS by using the QCL assumption.

## Claims

### Claim 1

A terminal comprising:
a control section that determines, a quasi-co-location (QCL) assumption of an aperiodic channel state information-reference signal (AP-CSI-RS), based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
(1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
(2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of: a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold; and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing; and
a receiving section that receives the AP-CSI-RS by using the QCL assumption.

### Claim 2 (depends on 1)

The terminal according to claim 1, wherein the other downlink signals with the indicated TCI states are at least one of: a PDSCH having a scheduling offset of equal to or greater than the threshold; an AP-CSI-RS having a scheduling offset of equal to or greater than the value of beam switch timing; a periodic channel state information-reference signal (P-CSI-RS); and a semi-persistent channel state information-reference signal (SP-CSI-RS).

### Claim 3

A radio communication method for a terminal, the radio communication method comprising:
determining, a quasi-co-location (QCL) assumption of an aperiodic channel state information-reference signal (AP-CSI-RS), based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
(1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
(2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of: a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold; and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing; and
receiving the AP-CSI-RS by using the QCL assumption.

### Claim 4

A base station comprising:
a transmitting section that transmits, to a terminal, an aperiodic channel state information-reference signal (AP-CSI-RS); and
a control section that assumes that, the terminal determines a quasi-co-location (QCL) assumption of the AP-CSI-RS, based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
(1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
(2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of: a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold; and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing.

### Claim 5

A system comprising a base station and a terminal, wherein
the base station comprises:
a transmitting section that transmits an aperiodic channel state information-reference signal (AP-CSI-RS); and
the terminal comprises:
a control section that determines, a quasi-co-location (QCL) assumption of the AP-CSI-RS, based on a control resource set (CORESET) corresponding to a lowest CORESET-ID among CORESET-IDs in a slot in which one or more CORESETs are monitored, in a case where:
(1) a scheduling offset between reception of a downlink control channel for communicating downlink control information scheduling the AP-CSI-RS and reception of the AP-CSI-RS is less than a value of reported beam switch timing, and the reported beam switch timing is any of 14, 28 and 48, and
(2) in a symbol identical to a symbol of the AP-CSI-RS, there are no other downlink signals with indicated transmission configuration indication state (TCI state) and in a symbol identical to a symbol of the AP-CSI-RS, there is at least one of: a physical downlink shared channel (PDSCH) having a scheduling offset of less than a threshold; and an AP-CSI-RS having a scheduling offset of less than the value of beam switch timing; and
a receiving section that receives the AP-CSI-RS by using the QCL assumption.