Handover ePDG [Документация VAS Experts]
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    en:dpi:epdg:handover [2026/04/21 08:04] – created elena.krasnobryzhen:dpi:epdg:handover [2026/04/21 08:07] (current) – [Handover Wi-Fi - LTE] elena.krasnobryzh
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     Main systems: Main systems:
    -  * **UE (User Equipment)** - Subscriber device. +  * **UE (User Equipment)** — Subscriber device. 
    -  * **Wi-Fi Access Point** The Wi-Fi access point through which the device connects to the network. +  * **Wi-Fi Access Point** — The Wi-Fi access point through which the device connects to the network. 
    -  * **eNodeB (eNB)** An LTE base station providing radio access. +  * **eNodeB (eNB)** — An LTE base station providing radio access. 
    -  * **MME (Mobility Management Entity)** - A subscriber mobility management node in LTE. +  * **MME (Mobility Management Entity)** — A subscriber mobility management node in LTE. 
    -  * **SGW (Serving Gateway)** A gateway for routing user traffic within a mobile network. +  * **SGW (Serving Gateway)** — A gateway for routing user traffic within a mobile network. 
    -  * **PGW (Packet Data Network Gateway)** A gateway to external networks (e.g. the Internet). +  * **PGW (Packet Data Network Gateway)** — A gateway to external networks (e.g. the Internet). 
    -  * **PCRF (Policy and Charging Rules Function)** - Control of traffic policies and QoS parameters. +  * **PCRF (Policy and Charging Rules Function)** — Control of traffic policies and QoS parameters. 
    -  * **HSS (Home Subscriber Server)** is a subscriber database. +  * **HSS (Home Subscriber Server)** — A subscriber database. 
    -  * **AAA Server (3GPP AAA)** A non-3GPP authentication server. +  * **AAA Server (3GPP AAA)** — A non-3GPP authentication server. 
    -  * **ePDG (Evolved Packet Data Gateway)** A gateway that securely connects a subscriber to a mobile kernel via untrusted Wi-Fi networks.+  * **ePDG (Evolved Packet Data Gateway)** — A gateway that securely connects a subscriber to a mobile kernel via untrusted Wi-Fi networks.
      
     Network elements communicate with each other through standard 3GPP interfaces. Network elements communicate with each other through standard 3GPP interfaces.
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     ^ Interface ^ Connected elements ^ Purpose ^ Specification ^ ^ Interface ^ Connected elements ^ Purpose ^ Specification ^
    -| **SWu** | UE - ePDG | Installation of a secure IPsec tunnel when accessed via Wi-Fi | 3GPP TS 24.302 | +| **SWu** | UE — ePDG | Installation of a secure IPsec tunnel when accessed via Wi-Fi | 3GPP TS 24.302 | 
    -| **SWm** | ePDG - AAA | Subscriber authentication via Diameter | 3GPP TS 29.273 | +| **SWm** | ePDG — AAA | Subscriber authentication via Diameter | 3GPP TS 29.273 | 
    -| **S2b** | ePDG - PGW | Transfer of user traffic between Wi-Fi access and EPC | 3GPP TS 29.273 | +| **S2b** | ePDG — PGW | Transfer of user traffic between Wi-Fi access and EPC | 3GPP TS 29.273 | 
    -| **S6b** | ePDG - HSS | Receiving subscriber data for authentication | 3GPP TS 29.273 | +| **S6b** | ePDG — HSS | Receiving subscriber data for authentication | 3GPP TS 29.273 | 
    -| **S11** | MME - SGW | Managing LTE bearer sessions | 3GPP TS 29.274 | +| **S11** | MME — SGW | Managing LTE bearer sessions | 3GPP TS 29.274 | 
    -| **S1-U** | eNodeB - SGW | User traffic transmission in LTE | 3GPP TS 36.414 | +| **S1-U** | eNodeB — SGW | User traffic transmission in LTE | 3GPP TS 36.414 | 
    -| **Gx** | PGW - PCRF | Transfer of QoS policies and tariff rules | 3GPP TS 29.212 |+| **Gx** | PGW — PCRF | Transfer of QoS policies and tariff rules | 3GPP TS 29.212 |
      
     ===== Handover types ===== ===== Handover types =====
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         * wi-fi signal     * wi-fi signal
         * linkage     * linkage
    -    * internal policies of the device. The device then starts searching for an available LTE network.+    * internal policies of the device.\\ The device then starts searching for an available LTE network.
       - **LTE connection**\\ UE establishes a radio connection to **eNodeB** and initiates a standard LTE connection procedure.   - **LTE connection**\\ UE establishes a radio connection to **eNodeB** and initiates a standard LTE connection procedure.
       - **Authentication and registration **\\ MME performs the following procedures:   - **Authentication and registration **\\ MME performs the following procedures: