Granted Patent B2

US 12,244,527 · App. 16/483,136 · Granted Mar 4, 2025

Inventors: Kazuaki Takeda (Tokyo, JP); Satoshi Nagata (Tokyo, JP); Chongning Na (Beijing, CN); Yuichi Kakishima (Palo Alto, CA)

Assignee: NTT DOCOMO, INC.

H04L5/0048H04B7/0695H04W16/28H04W24/10H04W36/085H04W72/23H04W74/004H04W74/0833

Abstract

Claims (33)

1. A terminal comprising:

a processor that detects a beam failure based on reception power of a synchronization block (SSB); and

a transmitter that transmits an uplink (UL) signal that requires beam recovery in response to detection of the beam failure,

wherein the transmitter transmits the UL signal using a UL resource having an association with an SSB of a candidate beam,

wherein the processor controls reception of a response signal to the UL signal based on the SSB of the candidate beam, and

wherein information representing the association between the UL resource and the SSB of the candidate beam is signaled by higher layer signaling.

2. The terminal according to claim 1 , wherein the processor blind decodes a downlink control channel for the response signal to the UL signal in a search space.

3. The terminal according to claim 1 , wherein the UL signal is a physical random access channel (PRACH) preamble.

4. A radio communication method for a terminal, comprising:

detecting a beam failure based on reception power of a synchronization block (SSB); and

transmitting an uplink (UL) signal that requires beam recovery in response to detection of the beam failure,

wherein the UL signal is transmitted using a UL resource having an association with an SSB of a candidate beam,

wherein the terminal controls reception of a response signal to the UL signal based on the SSB of the candidate beam, and

wherein information representing the association between the UL resource and the SSB of the candidate beam is signaled by higher layer signaling.

5. The terminal according to claim 2 , wherein the UL signal is a physical random access channel (PRACH) preamble.

6. A base station comprising:

a transmitter that transmits a synchronization block (SSB); and

a processor that controls reception of an uplink (UL) signal that requires beam recovery from a terminal which detects a beam failure based on reception power of the SSB,

wherein the UL signal is received using a UL resource having an association with an SSB of a candidate beam,

wherein the transmitter transmits a response signal to the UL signal based on the SSB of the candidate beam, and

wherein information representing the association between the UL resource and the SSB of the candidate beam is signaled by higher layer signaling.

7. A radio communication system comprising a terminal and a base station, wherein:

the terminal comprises:

a first processor that detects a beam failure based on reception power of a synchronization block (SSB); and

a first transmitter that transmits an uplink (UL) signal that requires beam recovery in response to detection of the beam failure,

wherein the first transmitter transmits the UL signal using a UL resource having an association with an SSB of a candidate beam,

wherein the first processor controls reception of a response signal to the UL signal based on the SSB of the candidate beam, and

wherein information representing the association between the UL resource and the SSB of the candidate beam is signaled by higher layer signaling, and

the base station comprises;

a second transmitter that transmits the SSB; and

a second processor that controls reception of the UL signal that requires beam recovery from the terminal,

wherein the UL signal is received using the UL resource having the association with the SSB of the candidate beam, and

wherein the second transmitter transmits the response signal to the UL signal based on the SSB of the candidate beam.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (47)