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Radio protocol architecture — User Piane

LTE-Uu    S14J    S5/S8    SGi

UE    eNodeB    ServingGW    PDNGW

GPRSTunnelling Protocol for the user piane (GTP-U): This protocoltunnels user data between eNodeB and theS-GW as wellas between the S-GW andthe P-GW in the backbonenetwork.GTP shall encapsulate all end userIP packets.

MME Controls the user piane tunnel establishment and establishes User Piane Bearers between eNodeB and S-GW.^

UDP/IP:These arethe backbonenetworkprotocols usedfor routeing user data and control signalling. LTE-Uu:The radio protocols of E-UTRAN between the UE andthe eNodeB arespecifiedinTS 36.300 [5].

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Figurę 5.1.2.1-1: User Piane*¹