LTE Bearer and Session Procedures
LTE bearer and session procedures show how EPS creates, changes, and releases packet-service paths after access and registration. Use this hub to jump into PDN connectivity, default bearer setup, dedicated bearer setup, VoLTE bearer handling, E-RAB control, bearer modification, and bearer release call flows.
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What This Covers
LTE bearer and session procedures create the PDN and EPS bearer context used for packet data service.
Default bearers provide the first IP service path, while dedicated bearers add service-specific QoS such as VoLTE handling.
Use the links below to jump directly into PDN connectivity, bearer setup, E-RAB setup, bearer modification, and release call flows.
Initial Bearer Setup
Procedures that create the first usable PDN and bearer path in EPS.
- LTE Default EPS Bearer Establishment — Establishes the first default bearer toward the UE.
- LTE APN / PDN Connectivity Setup Flow — Creates APN and PDN session context for service delivery.
Dedicated Service Bearers
Procedures that add dedicated bearer handling after the default path is active.
- LTE Dedicated EPS Bearer Establishment — Adds a dedicated bearer for additional QoS handling.
- LTE Dedicated Bearer Setup for VoLTE — Voice-oriented dedicated bearer setup path.
Bearer Modification
Procedures that modify existing bearer parameters and service behavior.
- LTE Bearer Modification Procedure — Modifies bearer behavior and related session parameters.
- LTE E-RAB Modify Procedure — Updates E-RAB handling on the radio-access side.
Bearer Release
Procedures that release bearer resources and clear related service state.
- LTE Bearer Release Procedure — Releases bearer resources and related session context.
- LTE E-RAB Release Procedure — Releases E-RAB resources toward the radio side.
Radio Access Bearer Control
Procedures that control the E-RAB layer on the access side.
- LTE E-RAB Setup Procedure — Builds the radio-access bearer side of service delivery.
- LTE E-RAB Modify Procedure — Updates E-RAB handling after setup.
- LTE E-RAB Release Procedure — Releases E-RAB resources when service no longer needs them.