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US 12,225,392 B2Granted
Terminal and communication method for beam failure recovery
AssigneeNtt Docomo, Inc.
InventorsHideaki Takahashi, Yuki Matsumura
Life of this patent
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Abstract
A terminal includes a transmitter that transmits a random access preamble; a receiver that receives a random access response; and a controller that uses a spatial filter applied to the transmission of the random access preamble for a transmission of an uplink control signal, in a time interval after the receiver receives the random access response until the receiver receives configuration information of another spatial filter.
Claims5
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.
4 more elements
A communication method executed by a terminal, the method comprising:
- transmitting a random access preamble, wherein a spatial filter is applied to the transmission of the random access preamble;
- receiving a random access response;
- and
- performing a random access procedure for executing beam failure recovery,
- wherein before a beam failure recovery time expires, the performing performs a contention-free random access procedure,
- wherein, when the beam failure recovery time expires, the performing performs a contention-based random access procedure, the random access preamble being applied to the contention-based random access procedure, and
- wherein the performing uses 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 receiving an activation command for PUCCH-SpatialRelationInfo or until the PUCCH-SpatialRelationInfo is configured.
4 more elements
A base station comprising:
- a receiver that receives a random access preamble from a terminal, wherein a spatial filter is applied to the transmission of the random access preamble;
- a transmitter that transmits a random access response;
- and
- a controller that controls an uplink control channel (PUCCH) reception for which the spatial filter applied to the reception of the random access preamble is used, 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 transmitter transmits an activation command for PUCCH-SpatialRelationInfo or until the PUCCH-SpatialRelationInfo is configured in the terminal,
- wherein the terminal is configured to perform a random access procedure for executing beam failure recovery, the random access procedure being a contention-free random access procedure before a beam failure recovery time expires, and
- wherein the random access preamble is applied to a contention-based random access procedure for performing the beam failure recovery after the beam failure recovery time expires.
3 more elements
Dependencies are inferred from the claim text.