This Recommendation specifies the framework, interfaces and protocols, and service procedures for signalling network analysis and optimization in IMT-2020, in which the signalling network refers to the network functions and the signalling exchange which are related to telecommunications services. It covers the aspects including an overview of a signalling network, requirements for signalling collection, requirements for signalling network analysis, requirements for signalling network optimization, framework, interfaces and protocols, service procedures, AI-assisted functions and general security considerations of signalling network analysis and optimization in IMT-2020.