What is tnl association?

The TNL associations may be SCTP associations. The NG-RAN is layered into a Radio Network Layer (RNL) and a Transport Network Layer (TNL). This procedure shall be the first S1AP procedure triggered after the TNL association has become operational. the set of TNL associations to be established between the NG-RAN node and the AMF;; weight factor associated with each of the TNL association within the AMF;. More than one TNL associations between an AMF/xNB pair should be allowed. A gNB shall have the capability to support multiple TNL associations per AMF.