LTE NAS Messages
LTE NAS messages cover EPS mobility management and session management signaling between the UE and the MME, including attach, authentication, service handling, TAU, detach, and bearer-related control paths.
Use this LTE NAS message library to browse Attach Request and future EPS NAS references defined in 3GPP TS 24.301, with searchable metadata, message summaries, IE names, and protocol-level context.
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All Messages in This Category
This is the full published list for the LTE NAS category. Use the filter section above for a narrower interactive view.
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.