Читать книгу Mobile Communications Systems Development - Rajib Taid - Страница 77

In the LTE/EPS, the S1 interface is used to exchange control or signaling‐related messages, between the eNodeB and the MME, which is also known as the S1‐AP (Application Protocol). To make the S1 interface operational for exchanges of information and other S1‐AP messages, the S1 interface is required to be setup first. For this purpose, the eNodeB sends the S1 Setup Request message, containing the eNodeB identity, Public Land Mobile Network (PLMN) identity, to the MME. The MME sends the S1 Setup Response message to the eNodeB. This is shown in Figure 3.14, which is reproduced from TS 36.413 [97]. Other examples where initialization of a logical interface is required is the 5G NG interface which is used between 5G NG‐RAN and AMF network function.

Figure 3.14 Initialization of LTE/EPS S1 interface.

Source: © 2014. 3GPP ™ TSs and TRs are the property of ARIB, ATIS, CCSA, ETSI, TSDSI, TTA and TTC who jointly own the copyright in them. © 2014, 3GPP.