7 W1 interface protocol structure

37.4703GPPGeneral aspects and principlesRelease 17TSW1 interface

7.1 W1 Control Plane Protocol (W1-C)

Figure 7.1-1 shows the protocol structure for W1-C. The TNL is based on IP transport, comprising the SCTP on top of IP. The application layer signalling protocol is referred to as W1AP (W1 Application Protocol).

Figure 7.1-1: Interface protocol structure for W1-C

7.2 W1 User Plane Protocol (W1-U)

Figure 7.2-1 shows the protocol structure for W1-U. The TNL is based on IP transport, comprising the UDP and GTP-U on top of IP.

Figure 7.2-1: Interface protocol structure for W1-U