ation message contains the following pieces of information: RRCReconfiguration rrc-TransactionIdentifier measConfig radiobearerconfig SecondaryCellGroup measConfig: this element of information defines the measurements to be performed on neighboring cells 5G (intra-frequency and inter-frequency) and 4G (inter-RAT). radiobearerconfig: this element of information is used for the establishment, modification and release of the radio medium and to modify the configuration of the PDCP layer and the dedicated physical channels. SecondaryCellGroup: this element of information indicates the list of SCells to be removed or added by configuring the parameters of the RLC, MAC and physical layer. The ReconfigurationComplete message is transmitted by the mobile to confirm the reconfiguration of the connection. The handover procedure is finalized upon receipt of this message. The dual connectivity procedure is established even in the absence of this message. 5G-NR Radio Interface - Radio Access Procedure 9.2.5. Connection re-establishment The connection re-establishment procedure allows the operation of the SRB1 support to resume, the reactivation of security and the configuration of the PCell. Table 9.7 provides the characteristics of the connection re-establishment message support. RLC mode Transport Logical channel channel Physical channel UL-SCH PUSCH ReestablishmentRequest DL-SCH PDSCH Reestablishment ReestablishmentReject UL-SCH PUSCH ReestablishmentComplete Table 9.7. Support for messages relating to connection re-establishment The ReestablishmentRequest message is transmitted by the mobile and contains the following information elements: RRCConnectionReestablishmentRequest ue-Identity reestablishmentCause ue-Identity: this element of information contains the identity of the mobile C-RNTI (Cell Radio Network Temporary Identity) and the physical identity of the PCI (Physical layer Cell Identity) cell to which the mobile was connected before the failure. reestablishmentCause: this information element indicates the cause (ha