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US 11,234,273 B2Granted
RACH conveyance of DL synchronization beam information for various DL-UL correspondence states
AssigneeQUALCOMM Incorporated
InventorsMuhammad Nazmul Islam, Sundar Subramanian, Junyi Li, Navid Abedini, Bilal Sadiq
Life of this patent
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Abstract
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a downlink (DL) signal from a base station on DL beam(s). The UE may identify a selected DL beam of the DL beam(s) for communications from the base station to the UE. The UE may transmit a random access channel (RACH) message to the base station using at least one of a resource or a RACH waveform selected based at least in part on the selected DL beam.
Claims26
A method for wireless communication at a user equipment (UE), comprising:
- receiving a downlink (DL) signal from a base station on one or more DL beams;
- identifying a selected DL beam of the one or more DL beams for communications from the base station to the UE;
- receiving an indication, from the base station, that beam correspondence is absent between the one or more DL beams from the base station and one or more uplink (UL) receive beams at the base station, the indication being based at least in part on a preamble format;
- identifying that beam correspondence is absent between the one or more DL beams from the base station and the one or more UL receive beams at the base station based at least in part on the indication;
- and
- transmitting a random access channel (RACH) message to the base station based at least in part on the beam correspondence being absent and using at least one of a resource or a RACH waveform selected based at least in part on the selected DL beam.
3 more elements
A method for wireless communication at a base station, comprising:
- transmitting a downlink (DL) signal on one or more DL beams;
- transmitting an indication that is based at least in part on a preamble format, the indication indicating that beam correspondence is absent between the one or more DL beams from the base station and one or more uplink (UL) receive beams at the base station, wherein the indication is transmitted in a physical broadcast channel (PBCH) signal, a minimum system information (SI) signal, or combinations thereof;
- receiving, on at least one of a resource or a random access channel (RACH) waveform, a RACH message from the UE;
- identifying, based at least in part on the resource or the RACH waveform and on the indication of the absent beam correspondence, a selected DL beam of the one or more DL beams for communications from the base station to the UE;
- and
- transmitting one or more subsequent messages to the UE using the selected DL beam.
3 more elements
A method for wireless communication at a base station, comprising:
- transmitting a downlink (DL) signal on one or more DL beams;
- transmitting an indication that is based at least in part on a preamble format, the indication indicating that beam correspondence is absent between the one or more DL beams from the base station and one or more uplink (UL) receive beams at the base station;
- receiving, on at least one of a resource or a random access channel (RACH) waveform, a RACH message from a user equipment (UE), wherein the RACH message is based at least in part on the indication that beam correspondence between the one or more DL beams from the base station and the one or more uplink receive beams at the base station is absent;
- identifying, based at least in part on the received resource or the RACH waveform, a preferred DL beam for communications from the base station to the UE;
- and
- transmitting one or more subsequent messages to the UE using the preferred DL beam.
3 more elements
An apparatus for wireless communication at a user equipment (UE), in a system comprising:
- a processor;
- memory in electronic communication with the processor;
- and
- instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
- receive a downlink (DL) signal from a base station on one or more DL beams;
- identify a selected DL beam of the one or more DL beams for communications from the base station to the UE;
- receive an indication, from the base station, that beam correspondence is absent between the one or more DL beams from the base station and one or more uplink (UL) receive beams at the base station, the indication being based at least in part on a preamble format;
- identify that beam correspondence is absent between the one or more DL beams from the base station and the one or more UL receive beams at the base station based at least in part on the indication;
- and
- transmit a random access channel (RACH) message to the base station based at least in part on the beam correspondence being absent and using at least one of a resource or a RACH waveform selected based at least in part on the selected DL beam.
7 more elements
Dependencies are inferred from the claim text.