# US 12,004,171 B2 · User terminal and radio communication method

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- Number: US 12,004,171 B2
- Document ID: US12004171B2
- Status: Granted
- Kind: B2
- Application number: 17/277,967
- Filed: 2018-09-21
- Published: 2021-12-09
- Granted: 2024-06-04
- Earliest claimed: 2018-09-21
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Hiroki Harada; Kazuki Takeda; Yuki Matsumura
- Web page: https://patentgrep.com/patent/US12004171B2

## CPC

- H04W 68/02: Arrangements for increasing efficiency of notification or paging channel
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0023: {Time-frequency-space}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A user terminal includes: a receiving section that monitors a physical downlink control channel for system information or paging in a connected mode; and a control section that determines a downlink reference signal that is quasi-co-location for the physical downlink control channel based on at least one of association between a physical downlink control channel monitoring occasion and a downlink reference signal and configuration information indicating a downlink reference signal that is quasi-co-location for a control resource set including the physical downlink control channel. According to an aspect of the present disclosure, a physical downlink control channel can be appropriately monitored.

## Claims

### Claim 1

A terminal comprising:
a receiver that monitors, in a connected mode, a Physical Downlink Control CHannel (PDCCH) for at least one of a system information and a paging; and
a processor that, when a control resource set including the PDCCH is a control resource set with index 0, assumes a Quasi-Co-Location (QCL) relation of a DeModulation Reference Signal (DMRS) antenna port for the PDCCH by a first operation and, when the control resource set is not the control resource set with index 0, assumes a QCL relation of the DMRS antenna port by a second operation that is different from the first operation,
wherein the first operation is an operation that assumes a downlink reference signal notified by a Medium Access Control Control Element (MAC CE) and the DMRS antenna port have a QCL relation, or an operation that assumes a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block corresponding to a Physical Random Access Channel (PRACH) in a most recent random access procedure and the DMRS antenna port has a QCL relation,
the second opertaion is an operation that assumes a downlink reference signal indicated by a Transmission Configuration Indicator (TCI) state notified by a higher layer signaling and the DMRS antenna port have a QCL relation, and
the processor, when a list of a plurality of TCI states each corresponding to different Transmission and Reception Points (TRPs) is notified by the higher layer signaling, assumes that a downlink reference signal indicated by a TCI state activated by a MAC CE among the list and the DMRS antenna port have a QCL relation.

### Claim 2

A radio communication method for a terminal comprising:
monitoring, in a connected mode, a Physical Downlink Control CHannel (PDCCH) for at least one of a system information and a paging; and
when a control resource set including the PDCCH is a control resource set with index 0, assuming a Quasi-Co_location (QCL) relation of a DeModulation Reference Signal (DMRS) antenna port for the PDCCH by a first operation and, when the control resource set is not the control resource set with index 0, assuming a QCL relation of the DMRS antenna port by a second operation that is different from the first operation,
wherein the first operation is an operation that assumes a downlink reference signal notified by a Medium Access Control Control Element (MAC CE) and the DMRS antenna port have a QCL relation, or an operation that assumes a Synchronization Siganl/Physical Broadcast Channel (SS/PBCH) block corresponding to a Physical Random Access Channel (PRACH) in a most recent random access procedure and the DMRS antenna port have a QCL relation,
the second operation is an operation that assumes a downlink reference signal indiated by a Transmission Configuration Indicator (TCI) state notified by a higher layer signaling and the DMRS antenna port have a QCL relation, and
when a list of a plurality of TCI states each corresponding to different Transmission and Reception Points (TRPs) is notified by the higher layer signaling, assuming that a downlink reference signal indicated by a TCI state activated by a MAC CE among the list and the DMRS antenna port have a QCL relation.

### Claim 3

A system comprising a terminal and a base station, wherein:
the terminal comprises:
a receiver that monitors, in a connected mode, a Physical Downlink Control CHannel (PDCCH) for at least one of a system information and a paging; and
a processor that, when a control resource set including the PDCCH is a control rresource set with index 0, assumes a Quasi-Co-Location (QCL) relation of a DeModulation Reference Signal (DMRS) antenna port for the PDCCH by a first operation and, when the control resource set is not the control resource set with index 0, assumes a QCL relation of the DMRS antenna port by a second operation that is different from the first operation,
wherein the first operation is an operation that assumes a downlink reference signal notified by a Medium Access Control Control Element (MAC CE) and the DMRS antenna port have a QCL relation, or an operation that assumes a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block corresponding to a Physical Random Access Channel (PRACH) in a most recent random access procedure and the DMRS antenna port have a QCL relation,
the second operation is an operation that assumes a downlink reference signal indicated by a Transmission Configureation Indicator (TCI) state notified by a higheer layer signaling and the DMRS antenna port have a QCL relation, and
the processor, when a list of a plurality of TCI states each corresponding to different Transmission and Reception Points (TRPs) is notified by the higher layer signaling, assumes that a downlink reference signal indicated by a TCI state activated by a MAC CE among the list and the DMRS antenna port have a QCL relation, and
the base station comprises:
a transmitter that transmits the PDCCH.