LTE RRC Messages
LTE RRC messages cover system information, connection setup, reconfiguration, security mode, paging, measurements, UE capability exchange, and handover signaling between the UE and eNodeB.
Use this LTE RRC message library to browse reference pages for MasterInformationBlock, System Information, SIB messages, RRCConnection procedures, Security Mode messages, Measurement Report, Paging, and other E-UTRA radio control signaling defined in 3GPP TS 36.331.
Filter and Browse
Search within this protocol family and narrow the list by direction or network. The results below update inside this section.
Start typing or choose a filter to narrow this message category.
All Messages in This Category
This is the full published list for the LTE RRC category. Use the filter section above for a narrower interactive view.
LTE RRC Connection Reconfiguration
Downlink LTE RRC message used to modify radio configuration, measurements, mobility behavior, bearer settings, and connected-mode control after setup.
LTE RRC Connection Reconfiguration Complete
Uplink LTE RRC message sent by the UE to confirm successful handling of RRCConnectionReconfiguration.
LTE RRC Connection Reestablishment
Downlink LTE RRC message sent by the network to accept re-establishment and rebuild the connected signaling context after a recoverable failure.
LTE RRC Connection Reestablishment Complete
Uplink LTE RRC message sent by the UE to confirm that re-establishment recovery was completed successfully.
LTE RRC Connection Reestablishment Reject
Downlink LTE RRC message sent by the network when the re-establishment attempt is not accepted.
LTE RRC Connection Reestablishment Request
Uplink LTE RRC message sent by the UE to request re-establishment after radio link failure, handover failure, or other re-establishment-eligible failure conditions.
LTE RRC Connection Reject
Downlink LTE RRC message sent by the eNodeB when a fresh RRC connection establishment attempt is not accepted.
LTE RRC Connection Release
Downlink LTE RRC message used to release the connected RRC context and move the UE back toward idle-mode behavior or redirection handling.
LTE RRC Connection Request
Uplink LTE RRC message sent by the UE on SRB0 and UL-CCCH to request establishment of an RRC connection.
LTE RRC Connection Resume Complete-r13
Uplink LTE RRC message sent by the UE to confirm that the resume branch completed successfully and the suspended context was restored.
LTE RRC Connection Resume Request-r13
Uplink LTE RRC message sent by the UE to request continuation of a suspended LTE context without starting a full fresh connection setup.
LTE RRC Connection Resume-r13
Downlink LTE RRC message sent by the eNodeB to resume a suspended LTE connection context without starting a full fresh connection setup.
LTE RRC Connection Setup
Downlink LTE RRC message sent by the eNodeB to establish SRB1 and move the UE into connected-mode signaling.
LTE RRC Connection Setup Complete
Uplink LTE RRC message sent by the UE after applying RRCConnectionSetup to confirm setup completion and carry the initial dedicated NAS message.
LTE RRC Counter Check
Downlink LTE RRC message used by the eNodeB to ask the UE to verify PDCP COUNT synchronization for one or more DRBs.
LTE RRC Counter Check Response
Uplink LTE RRC message used by the UE to reply to Counter Check and confirm the outcome of the PDCP COUNT verification step.
LTE RRC CSFB Parameters Request CDMA2000
Downlink LTE RRC message used to request cdma2000-related CS fallback parameter handling from the UE.
LTE RRC CSFB Parameters Response CDMA2000
Uplink LTE RRC message used by the UE to return cdma2000 CS fallback parameters requested by the network.
LTE RRC DL Dedicated Message Segment-r16
Downlink LTE RRC segmentation container used when a dedicated LTE RRC message is split across multiple fragments.
LTE RRC DL Information Transfer
Downlink LTE RRC message used by the eNodeB to carry NAS payloads toward the UE over the LTE access stratum.
LTE RRC Early Data Complete-r15
Downlink LTE RRC message used to complete the control-plane early data transmission branch.
LTE RRC Early Data Request-r15
Uplink LTE RRC message used by the UE to request control-plane early data transmission.
LTE RRC Failure Information r15
Uplink LTE RRC message used by the UE to report release-specific failure information back to the network.
LTE RRC Failure Information r16
Uplink LTE RRC message used by the UE to return release 16 failure information to the network.
LTE RRC Handover From EUTRA Preparation Request
Downlink LTE RRC message used when the source E-UTRA side starts handover preparation toward cdma2000.
LTE RRC InDeviceCoex Indication r11
Uplink LTE RRC message used by the UE to report in-device coexistence constraints that affect LTE radio operation.
LTE RRC InterFreqRSTD Measurement Indication r10
Uplink LTE RRC message used by the UE to indicate status around inter-frequency RSTD measurement handling for positioning-related procedures.
LTE RRC Logged Measurement Configuration-r10
Downlink LTE RRC message used to configure logged measurement collection for MDT-related behavior.
LTE RRC MBMS Counting Request r10
Downlink LTE RRC message used by the network to request MBMS counting responses from interested UEs.
LTE RRC MBMS Counting Response r10
Uplink LTE RRC message used by the UE to answer an MBMS counting request.
LTE RRC MBMS Interest Indication r11
Uplink LTE RRC message used by the UE to report MBMS interest information to the network.
LTE RRC MBSFN Area Configuration r9
Downlink LTE RRC message used to deliver MBSFN area configuration to the UE.
LTE RRC MCG Failure Information r16
Uplink LTE RRC message used by the UE to report master cell group failure information.
LTE RRC MeasReportAppLayer r15
Uplink LTE RRC message used by the UE to report configured application-layer measurement results to the network.
LTE RRC Measurement Report
Uplink LTE RRC message sent by the UE when configured measurement conditions are met so the network can make mobility and radio-control decisions.
LTE RRC MIB - Master Information Block
Broadcast LTE RRC message on BCH that gives the UE the first essential cell-wide radio context needed to continue system-information acquisition toward SIB1 and later access behavior.
LTE RRC MIB MBMS r14
Broadcast LTE RRC message carrying the MBMS-specific master information block for MBMS-oriented operation.
LTE RRC Mobility From EUTRA Command
Downlink LTE RRC message used to command mobility away from the current E-UTRA connection toward another RAT or a cell change order outcome.
LTE RRC Paging
Downlink LTE RRC message used to notify an idle UE that the network needs its attention for service, signaling, system information change, or warning-related behavior.
LTE RRC Proximity Indication r9
Uplink LTE RRC message used by the UE to report proximity-related status relevant to network-controlled proximity services handling.
LTE RRC PUR Configuration Request r16
Downlink LTE RRC message used to request or deliver PUR-related configuration handling.
LTE RRC RN Reconfiguration Complete-r10
Uplink LTE RRC message used by the relay node to acknowledge RNReconfiguration-r10.
LTE RRC RN Reconfiguration-r10
Downlink LTE RRC message used by a donor eNodeB to change relay-node specific configuration.
LTE RRC SCG Failure Information NR r15
Uplink LTE RRC message used in E-UTRA master / NR secondary contexts when the UE reports failure affecting the NR-side secondary cell group.
LTE RRC SCG Failure Information r12
Uplink LTE RRC message used by the UE to report secondary cell group failure in dual-connectivity related LTE contexts.
LTE RRC SCPTM Configuration BR r14
Downlink LTE RRC message used to deliver SC-PTM configuration for bandwidth-reduced UE contexts.
LTE RRC SCPTM Configuration r13
Downlink LTE RRC message used to deliver SC-PTM configuration to the UE.
LTE RRC Security Mode Command
Downlink LTE RRC message sent by the eNodeB to activate access-stratum security for the UE.
LTE RRC Security Mode Complete
Uplink LTE RRC message sent by the UE to confirm that SecurityModeCommand was accepted and LTE AS security activation succeeded.
LTE RRC Security Mode Failure
Uplink LTE RRC message sent by the UE when it cannot continue with the received SecurityModeCommand.
LTE RRC SIB1 - System Information Block Type 1
Broadcast LTE RRC message on BCCH and DL-SCH that gives the UE the essential access identity, cell selection, scheduling, and change-detection context needed before it can use the wider SIB set.
LTE RRC SIB1 BR r13
Broadcast LTE RRC message carrying the first BR-specific system-information block.
LTE RRC SIB1 MBMS r14
Broadcast LTE RRC message carrying the first MBMS-specific system-information block.
LTE RRC SIB13 - System Information Block Type 13
Broadcast LTE RRC system information block carried inside System Information that provides MBMS and MBSFN area information used before MCCH reception.
LTE RRC SIB2 - System Information Block Type 2
Broadcast LTE RRC system information block carried inside System Information that gives the UE the common radio, access barring, timer, and uplink-related context needed before normal LTE access can proceed.
LTE RRC SIB3 - System Information Block Type 3
Broadcast LTE RRC system information block carried inside System Information that gives the UE the serving-frequency cell reselection rules used in idle mode after the common SIB1 and SIB2 context is already known.
LTE RRC SIB4 - System Information Block Type 4
Broadcast LTE RRC system information block carried inside System Information that provides intra-frequency neighbor-cell detail used during idle-mode camping and same-frequency cell reselection.
LTE RRC SIB5 - System Information Block Type 5
Broadcast LTE RRC system information block carried inside System Information that provides inter-frequency reselection information for other LTE carrier frequencies in idle mode.
LTE RRC SIB6 - System Information Block Type 6
Broadcast LTE RRC system information block carried inside System Information that provides inter-RAT reselection information for UTRA frequencies and UTRA neighboring cells in idle mode.
LTE RRC SIB7 - System Information Block Type 7
Broadcast LTE RRC system information block carried inside System Information that provides inter-RAT reselection information for GERAN frequencies in idle mode.
LTE RRC SIB8 - System Information Block Type 8
Broadcast LTE RRC system information block carried inside System Information that provides inter-RAT reselection information for cdma2000 1xRTT and HRPD idle mobility.
LTE RRC Sidelink UE Information r12
Uplink LTE RRC message used by the UE to report sidelink-related information to the network.
LTE RRC System Information
Broadcast LTE RRC message on BCCH and DL-SCH that carries one or more SIBs such as SIB2 and later system-information blocks after the UE has already read MIB and SIB1.
LTE RRC System Information BR r13
Broadcast LTE RRC message carrying bandwidth-reduced system information.
LTE RRC System Information MBMS r14
Broadcast LTE RRC message carrying later MBMS-specific system information.
LTE RRC UE Assistance Information r11
Uplink LTE RRC message used by the UE to provide assistance information the network can use for connected-mode optimization decisions.
LTE RRC UE Capability Enquiry
Downlink LTE RRC message used by the eNodeB to request UE capability information before applying capability-dependent radio configuration.
LTE RRC UE Capability Information
Uplink LTE RRC message used by the UE to report its capability information back to the eNodeB.
LTE RRC UE Information Request r9
Downlink LTE RRC message used by the eNodeB to ask the UE for stored diagnostic information such as random access details or radio link failure context.
LTE RRC UE Information Response r9
Uplink LTE RRC message used by the UE to return the diagnostic information requested by UEInformationRequest-r9, including random access details, radio link failure context, or both.
LTE RRC UL Dedicated Message Segment-r16
Uplink LTE RRC segmentation container used when a UE dedicated LTE RRC message is sent in multiple fragments.
LTE RRC UL Handover Preparation Transfer
Uplink LTE RRC message used by the UE to return cdma2000 handover preparation information to the source eNodeB.
LTE RRC UL Information Transfer
Uplink LTE RRC message used by the UE to carry NAS payloads toward the network over the LTE access stratum.
LTE RRC UL Information Transfer IRAT r16
Uplink LTE RRC message used to transfer dedicated information in inter-RAT related contexts.
LTE RRC UL Information Transfer MRDC r15
Uplink LTE RRC message used to transfer dedicated information in MR-DC related contexts.
LTE RRC WLAN Connection Status Report r13
Uplink LTE RRC message used by the UE to report WLAN connection status relevant to LTE and WLAN interworking handling.