# US 12,113,591 B2 · User equipment and communication method

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- Number: US 12,113,591 B2
- Document ID: US12113591B2
- Status: Granted
- Kind: B2
- Application number: 17/613,445
- Filed: 2019-05-31
- Published: 2022-07-14
- Granted: 2024-10-08
- Earliest claimed: 2019-05-31
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yuichi Kakishima; Yuki Matsumura
- Web page: https://patentgrep.com/patent/US12113591B2

## CPC

- H04B 7/043: {using best eigenmode, e.g. beam forming or beam steering}
- H04B 7/06968: {using quasi-colocation [QCL] between signals}
- H04B 7/088: {using beam selection}
- H04W 16/28: using beam steering
- H04W 56/001: {Synchronization between nodes}
- H04W 88/02: Terminal devices
- 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)}
- H04B: TRANSMISSION
- 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

User equipment includes a control unit configured to determine a spatial reception parameter of a channel, based on quasi co-location (QCL) information related to a synchronization signal or a reference signal; and a reception unit configured to receive the channel based on the determined spatial reception parameter. In the QCL information, a QCL parameter applied to a source signal is partially or entirely different from a QCL parameter applied to a destination signal.

## Claims

### Claim 1

A communication method comprising:
determining a spatial reception parameter of a channel, based on quasi co-location (QCL) information related to a synchronization signal or a reference signal; and
receiving the channel based on the determined spatial reception parameter,
wherein, in the QCL information, a QCL parameter applied to a source signal is partially or entirely different from a QCL parameter applied to a destination signal,
wherein the QCL information is defined by a plurality of source signals or a plurality of destination signals, and
wherein the QCL information includes information indicating a QCL accuracy level or priority, and the accuracy level or priority is defined based on ranges of beams, applied to the plurality of source signals or the plurality of destination, signals, in which received power greater than or equal to a predetermined value is detected in a case where the beams are transmitted with a same transmission power at a predetermined distance.

### Claim 2

User equipment comprising:
a processor configured to determine a spatial reception parameter of a channel, based on quasi co-location (QCL) information related to a synchronization signal or a reference signal; and
a receiver configured to receive the channel based on the determined spatial reception parameter,
wherein, in the QCL information, a QCL parameter applied to a source signal is partially or entirely different from a QCL parameter applied to a destination signal,
wherein the QCL information is defined by a plurality of source signals or a plurality of destination signals, and
wherein the QCL information includes information indicating a QCL accuracy level or priority, and the accuracy level or priority is defined based on ranges of beams, applied to the plurality of source signals or the plurality of destination, signals, in which received power greater than or equal to a predetermined value is detected in a case where the beams are transmitted with a same transmission power at a predetermined distance.

### Claim 3 (depends on 2)

The user equipment according to claim 2, wherein a range of a beam, applied to the plurality of destination signals, in which received power greater than or equal to a predetermined value is detected, is narrower than a range of a beam, applied to a source signal, in which received power greater than or equal to the predetermined value is detected, in a case where the beams are transmitted with a same transmission power at a predetermined distance.

### Claim 4 (depends on 3)

The user equipment according to claim 3, wherein the range of the beam, applied to the plurality of destination signals, in which the received power greater than or equal to the predetermined value is detected, is included in the range of the beam, applied to the source signal, in which the received power greater than or equal to the predetermined value is detected, in the case where the beams are transmitted with the same transmission power at the predetermined distance.