7 E1 interface protocol structure
37.4803GPPE1 general aspects and principlesRelease 17TS
Figure 7.1-1 shows the protocol structure for E1. The TNL is based on IP transport, comprising the SCTP on top of IP. The application layer signalling protocol is referred to as E1AP (E1 Application Protocol).
Figure 7.1-1: Interface protocol structure for E1