4 SLm signalling bearer
36.4583GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17SLm interface signalling transportTS
4.1 Functions and protocol stack
SLm signalling bearer provides the following functions:
– Provision of reliable transfer of SLmAP message over SLm interface.
– Provision of networking and routeing function
– Provision of redundancy in the signalling network
– Support for flow control and congestion control
The protocol stack for SLm signalling bearer is shown in figure 4.1 and details on each protocol are described in the following clauses.
Figure 4.1: SLm signalling bearer protocol stack
The transport network layer is based on IP transport, comprising SCTP on top of IP.