 message is used by the eNB entity to command the activation of security mode on the radio interface. The SecurityModeCommand message is only checked for integrity. The SecurityModeComplete message is used by the mobile to confirm the activation of security mode. The SecurityModeFailure message is used by the mobile to indicate that security mode was unable to be activated. The encryption of the RRC messages will be effective only if the procedure has been successful. Having initiated the security mode activation procedure, the eNB entity begins the activation of the DRB. The RRC messages are encrypted and checked for integrity. The RRC ConnectionReconfiguration message is used by the eNB entity to command a modification of the RRC connection. This message may relate Signaling Protocols to the configuration of the measurements, control of the mobility and configuration of the DRB default bearer. This message can also transport NAS messages. The RRC ConnectionReconfigurationComplete message is used by the mobile to confirm the reconfiguration of the RRC connection. The RRC ConnectionReestablishmentRequest message is used by the mobile to request the re-establishment of the RRC connection. The RRC ConnectionReestablishment message is used by the eNB entity to re-establish the RRC connection. The RRC ConnectionReestablishmentComplete message is used by the mobile to confirm the re-establishment of the RRC connection. The RRC ConnectionReestablishmentReject message is used by the eNB entity to indicate that the reestablishment of the RRC connection has been rejected. The RRC ConnectionRelease message is used by the eNB entity to release the RRC connection. The procedure can also be used to redirect the mobile to a different frequency band. In exceptional cases, the mobile can terminate the RRC connection without alerting the eNB entity. 2.2.3. Measurement report The measurements carried out by the mobile must be in line with the configuration indicated in the RRC ConnectionReconfiguration message transmitted by the e