Patent ID: 11968135
Assignee: NOKIA TECHNOLOGIES OY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An apparatus comprising:
at least one processing core, and
at least one non-transitory memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to:
receive an indication that uplink transmissions to secondary cells are allowed during a connection establishment procedure;
determine that a connection with carrier aggregation is needed;
initiate the connection establishment procedure by transmitting a random access preamble to a primary cell;
receive, from the primary cell in response to the random access preamble, a random access response comprising a grant of uplink resources;
obtain an uplink transmission configuration comprising information on a secondary cell candidate frequency from the random access response;
transmit a signal in the uplink in the secondary cell candidate frequency to a secondary cell;
as a result of the random access response, transmit a signal in the uplink in accordance with the uplink transmission configuration on the secondary cell candidate frequency to a secondary cell, during a connection establishment procedure which transitions the apparatus from an idle mode to a connected mode such that the primary cell and the secondary cell establish the signal strength of the uplink signal to determine secondary cell configuration for the carrier aggregation; and
based on the signal strength, receive a carrier aggregation configuration from a network.