US 12,225,392 B2
Terminal and communication method for beam failure recovery
Hideaki Takahashi, Tokyo (JP); and Yuki Matsumura, Tokyo (JP)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Appl. No. 17/753,342
Filed by NTT DOCOMO, INC., Tokyo (JP)
PCT Filed Sep. 13, 2019, PCT No. PCT/JP2019/036137
§ 371(c)(1), (2) Date Feb. 28, 2022,
PCT Pub. No. WO2021/049014, PCT Pub. Date Mar. 18, 2021.
Prior Publication US 2022/0295315 A1, Sep. 15, 2022
Int. Cl. H04L 45/28 (2022.01); H04W 24/04 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 24/04 (2013.01) [H04W 74/0833 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A terminal comprising:
a transmitter that transmits a random access preamble, wherein a spatial filter is applied to the transmission of the random access preamble;
a receiver that receives a random access response; and
a controller that is configured to perform a random access procedure for executing beam failure recovery,
wherein before a beam failure recovery time expires, the controller is configured to perform a contention-free random access procedure,
wherein, when the beam failure recovery time expires, the controller is configured to perform a contention-based random access procedure, the random access preamble being applied to the contention-based random access procedure, and
wherein the controller is configured to use the spatial filter applied to the transmission of the random access preamble for a transmission of an uplink control channel (PUCCH), in a time interval after 28 symbols from a last symbol of a first physical downlink control channel (PDCCH) for the random access response and until the receiver receives an activation command for PUCCH-SpatialRelationInfo or until the PUCCH-SpatialRelationInfo is configured.