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LTE Protocols

  • Air Interface Physical Layer

    The LTE air interface physical layer offers data transport services to higher layers. The access to these services is through the use of a transport channel via the MAC sub-layer.

  • GPRS Tunnelling Protocol User Plane (GTP-U)

    GTP-U protocol is used over S1-U, X2, S4, S5 and S8 interfaces of the Evolved Packet System (EPS).

  • GTP-U Transport

    The transport layer for data streams over S1, X2, S4, S5 and S8  is an IP based Transport.

  • Medium Access Control (MAC)

    MAC protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.

    The main services and functions of the MAC sublayer include:

  • Non-Access-Stratum (NAS) Protocol

    The non-access stratum (NAS) is highest stratum of the control plane between UE and MME at the radio interface.

  • Packet Data Convergence Protocol (PDCP)

    PDCP protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.

    The main services and functions of the PDCP sublayer for the user plane include:

  • Radio Link Control (RLC)

    RLC protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.

    The main services and functions of the RLC sublayer include:

  • Radio Resource Control (RRC)

    RRC protocol layer exists in UE & eNodeb, It is part of LTE air interface control plane. The main services and functions of the RRC sublayer include:

  • S1 Application Protocol (S1AP)

    S1AP provides the signalling service between E-UTRAN and the evolved packet core (EPC) and has following functions:

  • S1 layer 1

    The main functions of S1 interface layer 1 are as following:

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