Beam selection and refinement during a random access channel (RACH) procedure
First Claim
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1. A method for wireless communication by a node B (NB), comprising:
- transmitting, by the NB, a first one or more directional beams to enable a user equipment (UE) to select a first beam;
receiving, by the NB, a message via the first beam from the UE as part of a random access channel (RACH) procedure; and
transmitting, by the NB, a second one or more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam.
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Abstract
Aspects of the present disclosure relate to wireless communications and, more particularly, to beam refinement during a RACH procedure. A NB may receive a message via a first beam from a UE as part of a RACH procedure and may transmit at least one signal for beam refinement during the RACH procedure. A UE may transmit, to a NB, a message via a first beam as part of a RACH procedure and may receive, from the NB, at least one signal for beam refinement during the RACH procedure. Any directional signal beam may be used for beam refinement as described herein.
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Citations
30 Claims
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1. A method for wireless communication by a node B (NB), comprising:
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transmitting, by the NB, a first one or more directional beams to enable a user equipment (UE) to select a first beam; receiving, by the NB, a message via the first beam from the UE as part of a random access channel (RACH) procedure; and transmitting, by the NB, a second one or more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for wireless communication by a user equipment (UE), comprising:
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receiving, by the UE, a first one or more directional beams to enable the UE to select a first beam; transmitting, by the UE to a node B (NB), a message via the first beam as part of a random access channel (RACH) procedure; and receiving, by the UE from the NB, a second one or more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for wireless communication by a node B (NB), comprising:
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means for transmitting, by the NB, a first one or more directional beams to enable a user equipment (UE) to select a first beam; means for receiving, by the NB, a message via the first beam from the UE as part of a random access channel (RACH) procedure; and means for transmitting, by the NB, a second or one more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam. - View Dependent Claims (26, 27)
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28. An apparatus for wireless communication by a user equipment (UE), comprising:
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means for receiving, by the UE, a first one or more directional beams to enable the UE to select a first beam; means for transmitting, by the UE to a node B (NB), a message via the first beam as part of a random access channel (RACH) procedure; and means for receiving, by the UE from the NB, s second one or more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam. - View Dependent Claims (29, 30)
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Specification