This Recommendation provides the signalling architecture of Software-defined network intelligence capability enhancement (S-NICE) based on Recommendation [ITU-T Y.3321] and [ITU-T Y.3322]. Based on the functional architecture of S-NICE, it introduces the reference points and specifies the interfaces in the signalling architecture of S-NICE. It also provides the signalling requirements of the interfaces, defines the protocols used for interfaces and describes the signalling procedures of S-NICE.