# US 2022/0279366 A1 · Terminal and radio communication method

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- Number: US 2022/0279366 A1
- Document ID: US20220279366A1
- Status: Published application
- Kind: A1
- Application number: 17/635,143
- Filed: 2019-08-15
- Published: 2022-09-01
- Earliest claimed: 2019-08-15
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yuki Matsumura; Satoshi Nagata; Jing Wang; Shaozhen Guo; Xiaolin Hou
- Web page: https://patentgrep.com/patent/US20220279366A1

## CPC

- H04W 24/04: Arrangements for maintaining operational condition
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

One aspect of a terminal in the present disclosure includes a transmitting section that transmits first information notifying occurrence of a beam failure when the beam failure is detected, and second information related to at least one of a cell in which the beam failure is detected and a new candidate beam; and a control section that controls to perform at least one of reception of downlink control information that indicates the transmission of the second information and transmission of the second information in a period configured after transmitting the first information.

## Claims

### Claim at position 1

-6. (canceled)

### Claim 7

A terminal comprising:
a transmitter that, when an uplink shared channel resource having a resource size sufficient for transmission of a medium access control (MAC) control element for beam failure recovery (BFR) does not exist after detection of beam failure in a secondary cell, performs a first operation of transmitting a scheduling request (SR); and
a processor that, when the uplink shared channel resource having a resource size sufficient for transmission of the MAC control element for the BFR exists, controls to omit the first operation and to perform a second operation of transmitting the MAC control element for the BFR by using the uplink shared channel resource.

### Claim 8 (depends on 7)

The terminal according to claim 7, wherein the transmitter performs the first operation in a primary cell and performs the second operation in a cell other than the secondary cell in which beam failure is detected.

### Claim 9 (depends on 7)

The terminal according to claim 7, wherein the MAC control element for the BFR includes information about an index of the secondary cell in which beam failure is detected and information about an index of a reference signal indicating a candidate beam.

### Claim 10

A radio communication method for a terminal, comprising:
when an uplink shared channel resource having a resource size sufficient for transmission of a medium access control (MAC) control element for beam failure recovery (BFR) does not exist after detection of beam failure in a secondary cell, performing a first operation of transmitting a scheduling request (SR); and
when the uplink shared channel resource having a resource size sufficient for transmission of the MAC control element for the BFR exists, controlling to omit the first operation and to perform a second operation of transmitting the MAC control element for the BFR by using the uplink shared channel resource.

### Claim 11

A system comprising a terminal and a base station, wherein
the terminal comprises:
a transmitter that, when an uplink shared channel resource having a resource size sufficient for transmission of a medium access control (MAC) control element for beam failure recovery (BFR) does not exist after detection of beam failure in a secondary cell, performs a first operation of transmitting a scheduling request (SR); and
a processor that, when the uplink shared channel resource having a resource size sufficient for transmission of the MAC control element for the BFR exists, controls to omit the first operation and to perform a second operation of transmitting the MAC control element for the BFR by using the uplink shared channel resource, and
the base station comprises:
a receiver that receives at least one of the SR and the MAC control element for the BFR.

### Claim 12 (depends on 8)

The terminal according to claim 8, wherein the MAC control element for the BFR includes information about an index of the secondary cell in which beam failure is detected and information about an index of a reference signal indicating a candidate beam.