The Recommendation ITU-T Q.4142 provides the signalling architecture for service orchestration in computing power network (CPN) based on Recommendation ITU-T Y.2501, ITU-T Y.2502 and ITU-T Q.4140. This Recommendation provides overall signalling architecture, functional entities and interfaces for service orchestration, and signalling procedures of computing resource collection, service orchestration within one operator, sharable service publishing among multiple operators, and cross-operator service orchestration.