The main functions of X2 interface layer 1 are as following:
The X2AP protocol is used to handle the UE mobility within E-UTRAN and provides the following functions:
X2 signalling bearer provides the following functions:
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.
S1AP provides the signalling service between E-UTRAN and the evolved packet core (EPC) and has following functions:
S1 signalling bearer provides the following functions:
The main functions of S1 interface layer 1 are as following:
The non-access stratum (NAS) is highest stratum of the control plane between UE and MME at the radio interface.
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.
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