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3GPP TS 24.301
LTE Activate Dedicated EPS Bearer Context Accept
Activate Dedicated EPS Bearer Context Accept is the EPS session-management message the UE sends to confirm that the dedicated bearer requested by the network was accepted and activated successfully.
LTE Activate Dedicated EPS Bearer Context Reject
Activate Dedicated EPS Bearer Context Reject is the LTE NAS message the UE sends when it cannot accept the dedicated bearer the network tried to activate.
LTE Activate Dedicated EPS Bearer Context Request
Activate Dedicated EPS Bearer Context Request is the EPS session-management message the network sends when it wants the UE to activate a dedicated bearer linked to an already active default bearer.
LTE Activate Default EPS Bearer Context Accept
Activate Default EPS Bearer Context Accept is the EPS session-management message the UE sends to confirm that the default bearer requested by the network was accepted and activated.
LTE Activate Default EPS Bearer Context Reject
Activate Default EPS Bearer Context Reject is the LTE NAS message the UE sends when it cannot accept the default bearer the network tried to activate.
LTE Activate Default EPS Bearer Context Request
Activate Default EPS Bearer Context Request is the EPS session-management message the network sends to the UE when it wants to activate the default bearer for a PDN connection.
LTE Attach Accept
Attach Accept is the EPS NAS message the MME uses to grant LTE attach and deliver the accepted EPS mobility context to the UE.
LTE Attach Complete
Attach Complete is the EPS NAS message the UE sends after Attach Accept to confirm that the granted attach context was received and processed.
LTE Attach Reject
Attach Reject is the EPS NAS message the network sends when the corresponding LTE attach request is not accepted.
LTE Attach Request
Attach Request is the EPS NAS message the UE uses to start the LTE attach procedure and ask the network to create EPS mobility-management context.
LTE Authentication Failure
Authentication Failure is the EPS NAS message the UE sends when it cannot accept or complete the LTE/EPS authentication challenge normally.
LTE Authentication Reject
Authentication Reject is the EPS NAS message the network sends when the LTE/EPS authentication attempt is not accepted and the current procedure cannot continue.
LTE Authentication Request
Authentication Request is the EPS NAS message the MME uses to challenge the UE during EPS NAS authentication and verify the subscriber before later security and mobility procedures continue.
LTE Authentication Response
Authentication Response is the EPS NAS message the UE sends after Authentication Request to return the calculated response parameter and let EPS authentication continue.
LTE Bearer Resource Allocation Reject
Bearer Resource Allocation Reject is the LTE NAS message the network sends when it refuses the UE's request for a dedicated bearer resource.
LTE Bearer Resource Allocation Request
Bearer Resource Allocation Request is the LTE NAS message the UE sends when it wants the network to allocate a dedicated bearer resource for an active PDN connection.
LTE Bearer Resource Modification Reject
Bearer Resource Modification Reject is the LTE NAS message the network sends when it refuses the UE's request to modify an existing bearer resource.
LTE Bearer Resource Modification Request
Bearer Resource Modification Request is the LTE NAS message the UE sends when it wants to change QoS or traffic-flow settings for an existing dedicated bearer resource.
LTE Control Plane Service Request
Control Plane Service Request is the LTE NAS message the UE sends when service restoration uses control-plane CIoT EPS optimization instead of the normal user-plane service request path.
LTE CS Service Notification
CS Service Notification is the LTE NAS message the network sends when it needs to notify the UE about an incoming CS-related service branch such as CS fallback.
LTE Deactivate EPS Bearer Context Accept
Deactivate EPS Bearer Context Accept is the LTE NAS message the UE sends after it released the bearer the network asked it to deactivate.
LTE Deactivate EPS Bearer Context Request
Deactivate EPS Bearer Context Request is the EPS session-management message the network sends when it wants the UE to release a default or dedicated bearer context that is no longer needed.
LTE Detach Accept
Detach Accept is the EPS NAS message used to confirm that the detach procedure has been completed, either as the network response to a UE-originated detach or as the UE response to a network-initiated detach.
LTE Detach Request
Detach Request is the EPS NAS message used to release EPS mobility-management context, either when the UE starts detach itself or when the network orders the UE to detach.
LTE Downlink Generic NAS Transport
Downlink Generic NAS Transport is the LTE NAS message the network sends when it needs to carry a generic payload through the EMM layer.
LTE Downlink NAS Transport
Downlink NAS Transport is the EPS mobility-management message the network sends to carry an encapsulated SMS NAS payload toward the UE over LTE NAS signaling.
LTE EMM Information
EMM Information is the EPS mobility-management message the network sends when it wants to deliver operator display names, time zone information, or related informational context to the UE during an established EMM context.
LTE EMM Status
EMM Status is the LTE NAS message used to report an EMM protocol error, invalid state, or message-format problem back to the peer.
LTE ESM Data Transport
ESM Data Transport is the LTE NAS message used to carry small user data through the control plane when control-plane CIoT EPS optimization is in use.
LTE ESM Dummy Message
ESM Dummy Message is the LTE NAS session-management message used as a minimal protected ESM payload in specific control-plane or procedure-maintenance branches.
LTE ESM Information Request
ESM Information Request is the LTE NAS session-management message the network sends when it needs protected APN or protocol configuration details before completing PDN handling.
LTE ESM Information Response
ESM Information Response is the LTE NAS session-management message the UE sends to return APN or protocol configuration detail after ESM Information Request.
LTE ESM Status
ESM Status is the LTE NAS message used to report an ESM protocol error, invalid state, or malformed session-management message.
LTE Extended Service Request
Extended Service Request is the EPS NAS message the UE sends when the service request procedure needs the extended LTE NAS form, especially for CS fallback, 1xCS fallback, or packet services via S1.
LTE GUTI Reallocation Command
GUTI Reallocation Command is the LTE NAS message the MME sends when it wants the UE to replace its current GUTI with a newly allocated identity.
LTE GUTI Reallocation Complete
GUTI Reallocation Complete is the LTE NAS message the UE sends to confirm that it accepted and stored the new GUTI.
LTE Identity Request
Identity Request is the EPS NAS message the MME sends when it needs the UE to provide a specific identity before the NAS procedure can continue.
LTE Identity Response
Identity Response is the EPS NAS message the UE sends after Identity Request to return the specific identity the MME asked for so the LTE NAS procedure can continue.
LTE Modify EPS Bearer Context Accept
Modify EPS Bearer Context Accept is the LTE NAS message the UE sends after it applied the bearer update requested by the network.
LTE Modify EPS Bearer Context Reject
Modify EPS Bearer Context Reject is the LTE NAS message the UE sends when it cannot accept a bearer modification proposed by the network.
LTE Modify EPS Bearer Context Request
Modify EPS Bearer Context Request is the LTE NAS message the network sends when it wants to change bearer parameters that are already active on the UE.
LTE Notification
Notification is the LTE NAS message the network sends when it needs to inform the UE about a specific NAS-side event that affects later handling.
LTE PDN Connectivity Request
PDN Connectivity Request is the EPS session-management message the UE sends when it wants connectivity to a PDN, either during attach or later as a standalone LTE NAS session request.
LTE PDN Disconnect Reject
PDN Disconnect Reject is the LTE NAS session-management message the network sends when it refuses the UE's request to release a PDN connection.
LTE PDN Disconnect Request
PDN Disconnect Request is the LTE NAS session-management message the UE sends when it wants to release one PDN connection and its associated default bearer.
LTE Remote UE Report
Remote UE Report is the LTE NAS message used in remote UE or CIoT handling to report remote-device status or event information toward the network.
LTE Remote UE Report Response
Remote UE Report Response is the LTE NAS message the network sends after it processes a Remote UE Report.
LTE Security Mode Command
Security Mode Command is the EPS NAS message the MME sends to activate the selected NAS security algorithms and move the LTE/EPS procedure into protected signaling.
LTE Security Mode Complete
Security Mode Complete is the EPS NAS message the UE sends to confirm that it accepted the selected NAS security algorithms and has switched into the commanded protected state.
LTE Security Mode Reject
Security Mode Reject is the EPS NAS message the UE sends when it cannot accept the NAS security configuration selected by the MME in Security Mode Command.
LTE Service Accept
Service Accept is the EPS NAS message the network sends when the service request procedure is accepted and active service can continue using the existing EPS context.
LTE Service Reject
Service Reject is the EPS NAS message the network sends when the service request procedure is not accepted.
LTE Service Request
Service Request is the EPS NAS message the UE uses to restore a NAS signaling connection and re-establish radio and S1 bearers while valid EPS context already exists.
LTE Tracking Area Update Accept
Tracking Area Update Accept is the EPS NAS message the MME uses to accept the tracking area updating procedure and return the updated EPS mobility context to the UE.
LTE Tracking Area Update Complete
Tracking Area Update Complete is the EPS NAS message the UE sends after Tracking Area Update Accept when the accepted TAU branch requires explicit UE completion.
LTE Tracking Area Update Reject
Tracking Area Update Reject is the EPS NAS message the network sends when the tracking area updating procedure is not accepted.
LTE Tracking Area Update Request
Tracking Area Update Request is the EPS NAS message the UE uses to update the network about tracking-area change, periodic presence, or related EPS mobility-context refresh.
LTE Uplink Generic NAS Transport
Uplink Generic NAS Transport is the LTE NAS message the UE sends when it needs to carry a generic payload through the EMM transport branch.
LTE Uplink NAS Transport
Uplink NAS Transport is the EPS mobility-management message the UE sends to carry an encapsulated SMS NAS payload toward the network over LTE NAS signaling.
3GPP TS 24.501
5G NAS - 5GSM Status
5GSM Status is the 5GSM message used by both the UE and the network to report protocol errors or invalid session-management conditions for an active PDU session.
5G NAS - Authentication Failure
Authentication Failure is the UE's NAS message indicating that it could not validate or complete the network authentication challenge.
5G NAS - Authentication Reject
Authentication Reject is the NAS message the network sends when the UE's authentication attempt is not accepted and the current 5GMM path must stop.
5G NAS - Authentication Request
Authentication Request is the NAS message the AMF uses to challenge the UE and start the 5G primary authentication procedure.
5G NAS - Authentication Response
Authentication Response is the UE's NAS reply to Authentication Request, carrying the computed response or EAP data needed for subscriber verification.
5G NAS - Authentication Result
Authentication Result is the NAS message used to transport the final EAP authentication result from the network to the UE.
5G NAS - Configuration Update Command
Configuration Update Command is the network-initiated NAS message used to update UE 5GMM context after registration.
5G NAS - Configuration Update Complete
Configuration Update Complete is the UE's NAS acknowledgement that a network-initiated configuration update was received and applied.
5G NAS - Control Plane Service Request
Control Plane Service Request is the NAS message used when the UE requests control-plane service handling without the normal user-plane service path.
5G NAS - Deregistration Accept (UE Originating)
Deregistration Accept (UE Originating) is the AMF response confirming that the UE-originated deregistration request was accepted.
5G NAS - Deregistration Accept (UE Terminated)
Deregistration Accept (UE Terminated) is the UE response confirming that a network-initiated deregistration request was received and accepted.
5G NAS - Deregistration Request (UE Originating)
Deregistration Request (UE Originating) is the NAS message the UE sends when it wants to deregister from the 5GS.
5G NAS - Deregistration Request (UE Terminated)
Deregistration Request (UE Terminated) is the AMF-to-UE NAS message used when the network initiates deregistration.
5G NAS - DL NAS Transport
DL NAS Transport is the NAS wrapper message the network uses to deliver a payload downward to the UE when the procedure needs to carry additional content transparently through NAS.
5G NAS - Identity Request
Identity Request is the NAS message the network sends when it needs the UE to provide a specific identity such as SUCI, 5G-GUTI-related context, IMEI, IMEISV, or other identity information.
5G NAS - Identity Response
Identity Response is the NAS message the UE sends after Identity Request to provide the specific identity type the network asked for, such as SUCI, IMEI, IMEISV, or another requested identifier.
5G NAS - Network Slice-Specific Authentication Command
Network Slice-Specific Authentication Command is the NAS message the network uses to start slice-specific authentication for a requested S-NSSAI.
5G NAS - Network Slice-Specific Authentication Complete
Network Slice-Specific Authentication Complete is the UE's response carrying the slice-specific authentication reply for the requested S-NSSAI.
5G NAS - Network Slice-Specific Authentication Result
Network Slice-Specific Authentication Result is the NAS message carrying the final outcome of slice-specific authentication for a requested S-NSSAI.
5G NAS - Notification
Notification is the NAS message the network sends to inform the UE about an event that requires the UE's attention in the current mobility-management context.
5G NAS - Notification Response
Notification Response is the NAS message the UE sends after receiving Notification from the network to acknowledge the NAS indication and let the protected procedure continue.
5G NAS - PDU Session Authentication Command
PDU Session Authentication Command is the 5GSM message that carries an EAP request from the SMF to the UE when session-level authentication or authorization is required.
5G NAS - PDU Session Authentication Complete
PDU Session Authentication Complete is the 5GSM message the UE sends in response to PDU Session Authentication Command to carry the EAP response and continue the session-authentication exchange.
5G NAS - PDU Session Authentication Result
PDU Session Authentication Result is the 5GSM message the SMF sends to indicate a successful outcome of PDU session authentication, and it can also carry an EAP-success when external DN authentication is used.
5G NAS - PDU Session Establishment Accept
PDU Session Establishment Accept is the 5GSM success message the network sends after it creates the requested PDU session and returns the final session parameters, address, and QoS context.
5G NAS - PDU Session Establishment Reject
PDU Session Establishment Reject is the 5GSM failure response the network sends when the requested PDU session cannot be created and the UE needs the rejection reason.
5G NAS - PDU Session Establishment Request
PDU Session Establishment Request is the 5GSM message the UE sends to request creation of a new PDU session for user-plane connectivity toward a DNN on a selected slice.
5G NAS - PDU Session Modification Command
PDU Session Modification Command is the 5GSM message the network sends to tell the UE how an active PDU session should be updated after the modification request is accepted or when the network itself is changing the session.
5G NAS - PDU Session Modification Command Reject
PDU Session Modification Command Reject is the 5GSM message the UE sends when it cannot accept the network's modification command for an active PDU session.
5G NAS - PDU Session Modification Complete
PDU Session Modification Complete is the 5GSM message the UE sends after it applies the network-approved changes to an active PDU session.
5G NAS - PDU Session Modification Reject
PDU Session Modification Reject is the 5GSM failure response the network sends when a UE-requested change to an active PDU session cannot be accepted.
5G NAS - PDU Session Modification Request
PDU Session Modification Request is the 5GSM message the UE sends to change an already active PDU session, such as updating QoS, packet-filter behavior, header-compression settings, or other session parameters.
5G NAS - PDU Session Release Command
PDU Session Release Command is the 5GSM message the network sends to tell the UE that an active PDU session is being released and to provide any release-related cause or retry guidance.
5G NAS - PDU Session Release Complete
PDU Session Release Complete is the 5GSM message the UE sends after it receives a release command and considers the active PDU session released.
5G NAS - PDU Session Release Reject
PDU Session Release Reject is the 5GSM failure response the network sends when it does not accept the UE's request to release an active PDU session.
5G NAS - PDU Session Release Request
PDU Session Release Request is the 5GSM message the UE sends when it wants to end an already active PDU session, or when it needs to release the session because of a local protocol or service condition.
5G NAS - Registration Accept
Registration Accept is the 5GMM message the AMF sends when it accepts UE registration and returns the mobility, security, and reachability context the UE needs to operate in the 5GS.
5G NAS - Registration Complete
Registration Complete is the UE-to-AMF NAS message used to confirm that the UE has accepted the registration context returned by the network.
5G NAS - Registration Reject
Registration Reject is the NAS message the AMF sends when a 5G registration attempt is refused and the UE must stop the current registration path.
5G NAS - Registration Request
Starts a 5G registration or mobility update by sending UE identity and registration intent to the core.
5G NAS - Relay Authentication Request
Relay Authentication Request is the NAS message the network sends to start or continue the relay-specific authentication branch after relay-key handling or related relay security preparation.
5G NAS - Relay Authentication Response
Relay Authentication Response is the NAS message the UE or relay participant sends back after Relay Authentication Request to return the relay-specific authentication result information.
5G NAS - Relay Key Accept
Relay Key Accept is the NAS message the network sends when the relay key request succeeds and the relay-related key response material can be delivered to the UE.
5G NAS - Relay Key Reject
Relay Key Reject is the NAS message the network sends when the relay key request cannot be accepted and the relay-related key procedure must stop or take a failure branch.
5G NAS - Relay Key Request
Relay Key Request is the NAS message used to request relay-related keying material so the relay security procedure can continue in a 5G relay or ProSe relay context.
5G NAS - Remote UE Report
Remote UE Report is the 5GSM message the relay UE sends to inform the network that one or more 5G ProSe remote UEs connected or disconnected through the relay.
5G NAS - Remote UE Report Response
Remote UE Report Response is the 5GSM acknowledgement sent back to the relay UE after the SMF processes a Remote UE Report.
5G NAS - Security Mode Command
Security Mode Command is the NAS message the AMF sends to activate the selected NAS security algorithms and move the 5GMM procedure into a protected signaling state.
5G NAS - Security Mode Complete
Security Mode Complete is the NAS message the UE sends to confirm that it accepted the selected NAS security algorithms and has switched into the commanded protected signaling state.
5G NAS - Security Mode Reject
Security Mode Reject is the NAS message the UE sends when it cannot accept the NAS security configuration selected by the AMF in Security Mode Command.
5G NAS - Service Accept
Service Accept is the NAS message confirming that the network accepted the UE's service request and that active service can continue.
5G NAS - Service Reject
Service Reject is the NAS message the network sends when a service request is refused even though the UE already has registration context.
5G NAS - Service Request
Service Request is the NAS message the UE uses to request service resumption when it already has a valid registration context but needs active signaling again.
5G NAS - Service-level Authentication Command
Service-level Authentication Command is the 5GSM message the SMF sends to deliver service-level authentication and authorization payload to the UE.
5G NAS - Service-level Authentication Complete
Service-level Authentication Complete is the 5GSM message the UE sends in response to Service-level Authentication Command and uses to return the service-level AA payload or response.
5G NAS - UL NAS Transport
UL NAS Transport is the NAS wrapper message the UE uses to send a payload upward toward the core when the NAS procedure needs to carry additional information transparently.
3GPP TS 36.331
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.
3GPP TS 38.331
5G NR - Counter Check
Counter Check is the NR RRC message the network uses to provide current PDCP COUNT MSB values for configured DRBs and ask the UE to compare them with its own COUNT state.
5G NR - Counter Check Response
Counter Check Response is the NR RRC message the UE sends after Counter Check to return the compared DRB COUNT values for bearer-state verification.
5G NR - Dedicated SIB Request
Dedicated SIB Request is the UE-to-network NR RRC message used to request on-demand system information while the UE is already in connected mode.
5G NR - DL Dedicated Message Segment
DL Dedicated Message Segment is the NR downlink RRC segmentation container used when a dedicated RRC message is too large to send as a single unit.
5G NR - DL Information Transfer
DL Information Transfer is the NR RRC message the network uses to send upper-layer information, most commonly NAS messages, to the UE over the established RRC connection.
5G NR - DL Information Transfer MRDC
DL Information Transfer MRDC is the downlink NR RRC container used to deliver MR-DC-related information toward the UE.
5G NR - Failure Information
Failure Information is the NR RRC message the UE uses to inform the network that it has detected a failure, especially an RLC bearer failure associated with an MCG or SCG bearer.
5G NR - IAB Other Information
IAB Other Information is an NR RRC message used to deliver additional IAB-specific information needed by an IAB node.
5G NR - Indirect Path Failure Information
Indirect Path Failure Information is an NR RRC message used to report failure related to an indirect path or relayed path in advanced deployment scenarios.
5G NR - Location Measurement Indication
Location Measurement Indication is the NR RRC message used by the UE to indicate location-related measurement information toward the network.
5G NR - Logged Measurement Configuration
Logged Measurement Configuration is the NR RRC message used to configure measurement logging behavior for MDT and later reporting workflows.
5G NR - Master Information Block (MIB)
The NR Master Information Block (MIB) is the first essential broadcast RRC information a UE decodes from PBCH after synchronization. It gives the UE the minimal system information needed to continue toward SIB1 acquisition and initial access.
5G NR - MBS Broadcast Configuration
MBS Broadcast Configuration is the NR RRC message used to provide UE-specific or dedicated MBS broadcast configuration.
5G NR - MBS Interest Indication
MBS Interest Indication is the UE-to-network NR RRC message used to indicate interest in MBS services or sessions.
5G NR - MBS Multicast Configuration
MBS Multicast Configuration is the NR RRC message used to provide dedicated MBS multicast configuration to the UE.
5G NR - MCG Failure Information
MCG Failure Information is the NR RRC message used by the UE to report failure related to the master cell group.
5G NR - Measurement Configuration
Measurement Configuration is the NR RRC configuration block that tells the UE what to measure, when to report, and how measurement identities map objects and report rules. It is usually delivered inside RRC Reconfiguration rather than as a standalone message.
5G NR - Measurement Report
Measurement Report is the NR RRC message a UE sends to the gNB when configured measurement conditions are met, allowing the network to make mobility, beam, and radio-resource decisions.
5G NR - Measurement Report AppLayer
Measurement Report AppLayer is the NR RRC message used by the UE to report application-layer measurements to the network.
5G NR - Mobility From NR Command
Mobility From NR Command is the NR RRC message used by the network to command mobility away from the current NR context toward another target system or mobility outcome.
5G NR - Paging
Paging is the NR RRC message used by the network to notify an idle-mode or inactive-mode UE that downlink signaling or service activity requires the UE's attention.
5G NR - RRC Reconfiguration
Reconfigures the UE radio connection after setup, including bearers, measurements, and mobility.
5G NR - RRC Reconfiguration Complete
RRC Reconfiguration Complete is the UE-to-network NR RRC message confirming that the UE successfully applied the received RRC Reconfiguration.
5G NR - RRC Reestablishment
RRC Reestablishment is the downlink NR RRC message the network sends when it accepts a reestablishment attempt and provides the recovered connected-mode context.
5G NR - RRC Reestablishment Complete
RRC Reestablishment Complete is the UE-to-network NR RRC message confirming that reestablishment succeeded and the recovered context is active.
5G NR - RRC Reestablishment Request
Uplink NR RRC message sent by the UE on SRB0 and CCCH to request re-establishment of an existing RRC connection after radio link failure, handover failure, or reconfiguration failure.
5G NR - RRC Reject
Downlink NR RRC message used by the network to reject an RRC connection establishment attempt or an RRC connection resumption attempt.
5G NR - RRC Release
RRC Release is the downlink NR RRC message used by the network to release the connected-mode context and move the UE out of active connected signaling.
5G NR - RRC Resume
RRC Resume is the downlink NR RRC message used by the network to resume a suspended or inactive context after a valid resume request.
5G NR - RRC Resume Complete
RRC Resume Complete is the UE-to-network NR RRC message confirming that the suspended or inactive context was resumed successfully.
5G NR - RRC Resume Request
RRC Resume Request is the UE-to-network NR RRC message used to request resumption of a suspended or inactive context.
5G NR - RRC Resume Request1
RRC Resume Request1 is an alternate NR RRC resume request message variant used in the resume procedure.
5G NR - RRC Setup
Downlink NR RRC message sent by the gNB to establish SRB1 and move the UE into the connected RRC procedure.
5G NR - RRC Setup Complete
Uplink NR RRC message sent by the UE on SRB1 and DCCH to confirm successful RRC connection establishment and transfer the initial NAS message.
5G NR - RRC Setup Request
Uplink NR RRC message sent by the UE on SRB0 and CCCH to request establishment of an RRC connection.
5G NR - RRC SystemInfo Request
RRC SystemInfo Request is the NR RRC message the UE uses to request system information directly from the network.
5G NR - SCG Failure Information
SCG Failure Information is the NR RRC message used by the UE to report failure related to the secondary cell group.
5G NR - SCG Failure Information EUTRA
SCG Failure Information EUTRA is the NR RRC message used to report failure in an E-UTRA secondary cell group context.
5G NR - Security Mode Command
Downlink NR RRC message used by the gNB to activate AS security for the UE in RRC_CONNECTED.
5G NR - Security Mode Complete
Uplink NR RRC message used by the UE to confirm successful activation of the selected AS security configuration.
5G NR - Security Mode Failure
Uplink NR RRC message used by the UE to indicate that the commanded AS security activation could not be completed successfully.
5G NR - Sidelink UE Information NR
Sidelink UE Information NR is the UE-to-network NR RRC message used to provide sidelink-related information toward the network.
5G NR - System Information
System Information is the NR RRC broadcast container used to carry one or more SIBs or positioning SIBs with the same periodicity.
5G NR - System Information Block 1 (SIB1)
SystemInformationBlockType1 (SIB1) is the key NR broadcast system information block that tells the UE how to access the cell, select PLMN context, and interpret important cell-level access restrictions and configuration.
5G NR - System Information Block 10 (SIB10)
System Information Block 10 (SIB10) is an NR broadcast system information block used to carry the Human-Readable Network Names (HRNN) of NPNs listed in SIB1.
5G NR - System Information Block 11 (SIB11)
System Information Block 11 (SIB11) is an NR broadcast system information block used to provide idle and inactive measurement configuration for the UE.
5G NR - System Information Block 12 (SIB12)
System Information Block 12 (SIB12) is an NR broadcast system information block used to provide sidelink communication and discovery configuration to UEs that support NR sidelink.
5G NR - System Information Block 13 (SIB13)
System Information Block 13 (SIB13) is an NR broadcast system information block used to provide V2X sidelink communication information aligned with the LTE SystemInformationBlockType21 behavior referenced by NR.
5G NR - System Information Block 14 (SIB14)
System Information Block 14 (SIB14) is an NR broadcast system information block used to provide information related to LTE SystemInformationBlockType26 for V2X sidelink communication.
5G NR - System Information Block 15 (SIB15)
System Information Block 15 (SIB15) is an NR broadcast system information block used to provide disaster roaming information for PLMNs sharing the cell.
5G NR - System Information Block 16 (SIB16)
System Information Block 16 (SIB16) is an NR broadcast system information block used to provide slice-based cell reselection information.
5G NR - System Information Block 17 (SIB17)
System Information Block 17 (SIB17) is an NR broadcast system information block used to provide TRS resource configuration for idle and inactive UEs.
5G NR - System Information Block 18 (SIB18)
System Information Block 18 (SIB18) is an NR broadcast system information block used to provide Group IDs for Network selection (GINs) to support credentials-holder based access and UE onboarding.
5G NR - System Information Block 19 (SIB19)
System Information Block 19 (SIB19) is an NR broadcast system information block used to provide NTN-specific parameters for the serving cell and, when present, neighboring NTN cells.
5G NR - System Information Block 2 (SIB2)
System Information Block 2 (SIB2) is an NR broadcast system information block used mainly for cell reselection and idle-state mobility-related behavior after the UE has already acquired the essential access information from MIB and SIB1.
5G NR - System Information Block 20 (SIB20)
System Information Block 20 (SIB20) is an NR broadcast system information block used to provide the MCCH and MTCH acquisition configuration for MBS broadcast.
5G NR - System Information Block 21 (SIB21)
System Information Block 21 (SIB21) is an NR broadcast system information block used to provide MBS Frequency Selection Area Identity mapping for service continuity.
5G NR - System Information Block 22 (SIB22)
System Information Block 22 (SIB22) is an NR broadcast system information block used to provide ATG-specific parameters for the serving cell and optionally neighboring cells.
5G NR - System Information Block 23 (SIB23)
System Information Block 23 (SIB23) is an NR broadcast system information block used to provide ranging and sidelink positioning information.
5G NR - System Information Block 24 (SIB24)
System Information Block 24 (SIB24) is an NR broadcast system information block used to provide the information required to acquire multicast MCCH and MTCH configuration.
5G NR - System Information Block 25 (SIB25)
System Information Block 25 (SIB25) is an NR broadcast system information block used to provide TN coverage information for NTN-related operation.
5G NR - System Information Block 3 (SIB3)
System Information Block 3 (SIB3) is an NR broadcast system information block used for intra-frequency cell reselection behavior and idle-state mobility decisions on the current NR carrier.
5G NR - System Information Block 4 (SIB4)
System Information Block 4 (SIB4) is an NR broadcast system information block used for inter-frequency cell reselection behavior and idle-state mobility decisions across other NR carrier frequencies.
5G NR - System Information Block 5 (SIB5)
System Information Block 5 (SIB5) is an NR broadcast system information block used for inter-RAT mobility context, helping the UE evaluate reselection toward other radio access technologies such as LTE.
5G NR - System Information Block 6 (SIB6)
System Information Block 6 (SIB6) is an NR broadcast system information block used for inter-RAT mobility context toward UTRA, helping the UE evaluate reselection from NR toward UMTS when that mobility path is part of the deployment.
5G NR - System Information Block 7 (SIB7)
System Information Block 7 (SIB7) is an NR broadcast system information block used for inter-RAT mobility context toward GERAN, helping the UE evaluate reselection from NR toward GSM where that legacy mobility path still exists.
5G NR - System Information Block 8 (SIB8)
System Information Block 8 (SIB8) is an NR broadcast system information block used for inter-RAT mobility context toward cdma2000 systems where that legacy mobility path still exists.
5G NR - System Information Block 9 (SIB9)
System Information Block 9 (SIB9) is an NR broadcast system information block used to convey time information such as UTC and GPS-related timing context to the UE.
5G NR - UE Assistance Information
UE Assistance Information is the UE-to-network NR RRC message used to provide assistance or preference information that helps the network optimize handling for the UE.
5G NR - UE Capability Enquiry
Downlink NR RRC message used by the gNB to request UE capability information needed for feature, bearer, mobility, and radio configuration decisions.
5G NR - UE Capability Information
Uplink NR RRC message used by the UE to report its supported radio capability containers to the gNB.
5G NR - UE Information Request
UE Information Request is the NR RRC message the network uses to ask the UE for diagnostic information such as radio link failure context, connection establishment failure context, logged measurements, mobility history, random access reports, or idle and inactive measurement information.
5G NR - UE Information Response
UE Information Response is the NR RRC message the UE uses to return requested diagnostic information such as RLF data, connection establishment failure data, logged measurements, mobility history, random access reports, or idle and inactive measurement information.
5G NR - UE Positioning Assistance Info
UE Positioning Assistance Info is the UE-to-network NR RRC message used to provide UE-side positioning assistance information.
5G NR - UL Dedicated Message Segment
UL Dedicated Message Segment is the uplink NR RRC segmentation container used when a UE dedicated RRC payload is too large to send as a single message.
5G NR - UL Information Transfer
UL Information Transfer is the NR RRC message the UE uses to send upper-layer information, most commonly NAS messages, to the network over the established RRC connection.
5G NR - UL Information Transfer IRAT
UL Information Transfer IRAT is the UE-to-network NR RRC wrapper used to carry inter-RAT related information in the uplink direction.
5G NR - UL Information Transfer MRDC
UL Information Transfer MRDC is the UE-to-network NR RRC wrapper used to carry MR-DC-related information in the uplink direction.
3GPP TS 38.413
RFC 3261 / 3GPP TS 24.229
IMS SIP 100 Trying
100 Trying confirms that the request was received and transaction processing has started.
IMS SIP 180 Ringing
180 Ringing shows that the terminating side is being alerted for the session request.
IMS SIP 181 Call Is Being Forwarded
181 Call Is Being Forwarded shows that the original target is redirecting or forwarding the session attempt.
IMS SIP 182 Queued
182 Queued shows that the request is waiting in a queue instead of progressing immediately.
IMS SIP 200 OK
200 OK confirms that the SIP request completed successfully.
IMS SIP 302 Moved Temporarily
302 Moved Temporarily redirects the sender to another temporary target or contact.
IMS SIP 380 Alternative Service
380 Alternative Service indicates that the original request cannot be served as asked and suggests another service path.
IMS SIP 400 Bad Request
400 Bad Request means the request could not be understood or accepted because of syntax or structural problems.
IMS SIP 401 Unauthorized
401 Unauthorized challenges the request and asks the sender to retry with authentication.
IMS SIP 403 Forbidden
403 Forbidden means the request was understood but the network or service refused to allow it.
IMS SIP 404 Not Found
404 Not Found means the target user or service could not be found at the requested destination.
IMS SIP 405 Method Not Allowed
405 Method Not Allowed means the target exists but does not allow the SIP method that was used.
IMS SIP 406 Not Acceptable
406 Not Acceptable means the request was understood, but the target cannot satisfy the acceptable formats or features indicated.
IMS SIP 407 Proxy Authentication Required
407 Proxy Authentication Required challenges the sender to authenticate through a SIP proxy, commonly the P-CSCF path.
IMS SIP 408 Request Timeout
408 Request Timeout means the expected transaction progress did not happen in time.
IMS SIP 415 Unsupported Media Type
415 Unsupported Media Type means the target cannot process the request body in the format that was sent.
IMS SIP 480 Temporarily Unavailable
480 Temporarily Unavailable means the target is currently unreachable or unavailable, but not permanently unknown.
IMS SIP 481 Call or Transaction Does Not Exist
481 Call or Transaction Does Not Exist means the receiving side could not match the request to a valid dialog or transaction.
IMS SIP 486 Busy Here
486 Busy Here means the target user is busy at the reached destination.
IMS SIP 487 Request Terminated
487 Request Terminated means the original request branch was stopped before normal completion.
IMS SIP 488 Not Acceptable Here
488 Not Acceptable Here means the request reached the target, but the local media or session offer cannot be accepted there.
IMS SIP 500 Server Internal Error
500 Server Internal Error means the server hit an internal problem while handling the request.
IMS SIP 503 Service Unavailable
503 Service Unavailable means the service cannot handle the request right now, usually for temporary server or overload reasons.
IMS SIP 504 Server Time-out
504 Server Time-out means a server did not get a timely answer from another server while handling the request.
IMS SIP 600 Busy Everywhere
600 Busy Everywhere means the request should not be retried elsewhere because the target is considered busy globally.
IMS SIP 603 Decline
603 Decline means the request was actively refused and should not be retried to other locations for the same attempt.
IMS SIP 604 Does Not Exist Anywhere
604 Does Not Exist Anywhere means the target does not exist globally for the request.
IMS SIP 606 Not Acceptable
606 Not Acceptable means no acceptable target branch can satisfy the requested session or content constraints.
IMS SIP ACK
ACK is the SIP request that confirms a final response to INVITE.
IMS SIP BYE
BYE is the SIP request that terminates an established dialog.
IMS SIP CANCEL
CANCEL is the SIP request that stops a pending INVITE transaction before final acceptance.
IMS SIP INVITE
INVITE is the SIP request that starts or modifies the main session dialog in IMS.
IMS SIP OPTIONS
OPTIONS is the SIP request used to query capabilities or liveness without creating a full session.
IMS SIP REGISTER
REGISTER is the SIP request that creates, refreshes, or removes IMS service reachability for the UE.
RFC 3261 / RFC 3262 / 3GPP TS 24.229
RFC 3261 / RFC 3515 / 3GPP TS 24.229
RFC 3262 / 3GPP TS 24.229
RFC 3311 / 3GPP TS 24.229
RFC 3428 / 3GPP TS 24.229
RFC 3515 / 3GPP TS 24.229
RFC 3903 / 3GPP TS 24.229
RFC 6086 / 3GPP TS 24.229
RFC 6665 / 3GPP TS 24.229
IMS SIP NOTIFY
NOTIFY is the SIP request that delivers state updates for an active subscription.
IMS SIP SUBSCRIBE
SUBSCRIBE is the SIP request that creates or refreshes a subscription to an event package.