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.
GTP-U protocol is used over S1-U, X2, S4, S5 and S8 interfaces of the Evolved Packet System (EPS).
The transport layer for data streams over S1, X2, S4, S5 and S8 is an IP based Transport.
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:
The non-access stratum (NAS) is highest stratum of the control plane between UE and MME at the radio interface.
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:
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:
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:
S1AP provides the signalling service between E-UTRAN and the evolved packet core (EPC) and has following functions:
The main functions of S1 interface layer 1 are as following:
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