4 E1 signalling bearer
37.4823GPPE1 signalling transportRelease 17TS
4.1 Function and protocol stack
E1 signalling bearer provides the following functions:
– Provision of reliable transfer of E1AP message over E1 interface.
– Provision of networking and routing function
– Provision of redundancy in the signalling network
– Support for flow control and congestion control
The protocol stack for E1 Signalling Bearer is shown in figure 4.1-1 and details on each protocol are described in the following sections.
Figure 4.1-1: E1 signalling bearer protocol stack
The Transport Network Layer is based on IP transport, comprising SCTP on top of IP.