| CPC H04W 76/10 (2018.02) [H04W 24/10 (2013.01)] | 18 Claims |

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1. A method performed by a user device, the method comprising:
receiving, from a base station, a radio resource control (RRC) setup message comprising a first configuration parameter for signaling radio bearer (SRB), wherein the first configuration parameter for SRB is for configuring signaling radio bearer 1 (SRB1);
receiving at least one RRC configuration comprising a second configuration parameter for SRB, wherein the second configuration parameter for SRB is for configuring signaling radio bearer 4 (SRB4);
receiving, from the base station via a first cell, first configuration information comprising:
a parameter that indicates RRC segmentation is enabled; and
at least one configuration of application layer measurements;
generating an RRC message comprising an application layer measurement report associated with the at least one configuration of application layer measurements;
generating, based on the generated RRC message being larger than a specific size and based on the parameter that indicates RRC segmentation is enabled, at least one uplink message segment by segmenting the generated RRC message;
transmitting, to the base station, the at least one uplink message segment via SRB4;
receiving, from the base station, a second RRC message comprising second configuration information, wherein the second configuration information comprises information for a second cell;
transmitting, to the base station via the second cell, a third RRC message in response to the second RRC message; and
performing, via the second cell, retransmission of the at least one uplink message segment via SRB4.
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