RRC Messages on LTE

SN	RRC Message	SRB	RLC SAP	Logical Channel	Direction	Desc
1	Paging	N/A	TM	PCCH	E-UTRAN to UE	The Pagingmessage is used for the notification of one or more UEs.
2	MasterInformationBlock	N/A	TM	BCCH	E-UTRAN to UE	The MasterInformationBlock includes the system information transmitted on BCH.
3	SystemInformationBlockType1	N/A	TM	BCCH	E-UTRAN to UE	SystemInformationBlockType1contains information relevant when evaluating if a UE is allowed to access a cell and defines the scheduling of other system information.
4	SystemInformation	N/A	TM	BCCH	E-UTRAN to UE	The SystemInformationmessage is used to convey one or more SystemInformation Blocks. All the SIBs included are transmitted with the same periodicity.
5	RRCConnectionRequest	SRB0	TM	CCCH	UE to E-UTRAN	The RRCConnectionRequestmessage is used to request the establishment of an RRC connection.
6	RRCConnectionSetup	SRB0	TM	CCCH	E-UTRAN to UE	The RRCConnectionSetupmessage is used to establish SRB1.
7	RRCConnectionSetupComplete	SRB1	AM	DCCH	UE to E-UTRAN	The RRCConnectionSetupCompletemessage is used to confirm the successful completion of an RRC connection establishment.
8	RRCConnectionReject	SRB0	TM	CCCH	E-UTRAN to UE	The RRCConnectionRejectmessage is used to reject the RRC connection establishment.
9	RRCConnectionRelease	SRB1	AM	DCCH	E-UTRAN to UE	The RRCConnectionReleasemessage is used to command the release of an RRC connection.
10	RRCConnectionReject	SRB0	TM	CCCH	E-UTRAN to UE	The RRCConnectionRejectmessage is used to reject the RRC connection establishment.
11	RRCConnectionReconfiguration	SRB1	AM	DCCH	E-UTRAN to UE	The RRCConnectionReconfigurationmessage is the command to modify an RRC connection. It may convey  information for measurement configuration, mobility control, radio resource configuration (including RBs, MAC main configuration and physical channel configuration) including any associated dedicated NASinformation and security configuration.
12	RRCConnectionReconfigurationComplete	SRB1	AM	DCCH	UE to E-UTRAN	The RRCConnectionReconfigurationCompletemessage is used to confirm the successful completion of an RRC connection reconfiguration.
13	RRCConnectionReestablishment	SRB0	TM	CCCH	E-UTRAN to UE	The RRCConnectionReestablishmentmessage is used to re-establish SRB1.
14	RRCConnectionReestablishmentRequest	SRB0	TM	CCCH	UE to E-UTRAN	The RRCConnectionReestablishmentRequestmessage is used to request the reestablishment of an RRC connection.
15	RRCConnectionReestablishmentComplete	SRB1	AM	DCCH	UE to E-UTRAN	The RRCConnectionReestablishmentCompletemessage is used to confirm the successful completion of an RRC connection reestablishment.
16	RRCConnectionReestablishmentReject	SRB0	TM	CCCH	E-UTRAN to UE	The RRCConnectionReestablishmentReject message is used to indicate the rejection of an RRC connection reestablishment request.
17	SecurityModeCommand	SRB1	AM	DCCH	E-UTRAN to UE	The SecurityModeCommandmessage is used to command the activation of AS security.
18	SecurityModeComplete	SRB1	AM	DCCH	UE to E-UTRAN	The SecurityModeCompletemessage is used to confirm the successful completion of a security mode command.
19	SecurityModeFailure	SRB1	AM	DCCH	UE to E-UTRAN	The SecurityModeFailuremessage is used to indicate an unsuccessful completion of a security mode command.
20	UECapabilityEnquiry	SRB1	AM	DCCH	E-UTRAN to UE	The UECapabilityEnquirymessage is used to request the transfer of UE radio access capabilities for E-UTRA as well as for other RATs.
21	UECapabilityInformation	SRB1	AM	DCCH	UE to E-UTRAN	The UECapabilityInformationmessage is used to transfer of UE radio access capabilities requested by the E-UTRAN.
22	UEInformationRequest	SRB1	AM	DCCH	E-UTRAN to UE	The UEInformationRequestis the command used by E-UTRAN to retrieve information from the UE.
23	UEInformationResponse	SRB1	AM	DCCH	UE to E-UTRAN	The UEInformationResponse message is used by the UE to transfer the information requested by the E-UTRAN.