Patent ID: 11956834
Assignee: NOKIA TECHNOLOGIES OY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. An system comprising:
user equipment configured to:
select at least one preamble group that indicates a use of beam sweeping, wherein a preamble of a first group transmitted from the user equipment indicates that the user equipment is attempting access with beam sweeping; and
transmit a plurality of beam-formed random access signals comprising at least one preamble from the selected preamble group over a set of random access channel occasions, each beam-formed random access signal being transmitted using a different beam, wherein each of the plurality of beam-formed random access signals are uniquely identifiable by the random access channel occasion over which they are transmitted; and

a base station configure to:
receive a first one of the plurality of beam-formed random access signals comprising at least one preamble from the selected preamble group over a set of random access channel occasions;
based on a preamble of the received first one of the plurality of beam-formed random access signals, determine that the user equipment is attempting access with beam sweeping;
based on the determining, await reception of all of the plurality of beam-formed access signals before selecting one of the plurality of beam-formed random access signals;
after receipt of all of the plurality of beam-formed random access signals, comparing a reference signal received power (RSRP) for each of the plurality of beamed formed random access signals;
based on the comparing, select one of the beam-formed random access signals that has a highest RSRP, and
transmit, to the user equipment, within a random access response message to the user equipment, at least an indicator of the selected beam-formed random access signal.