Abstract: Handling of performance monitoring in a wireless communications system (100) comprising a transport network (150) relating to infrastructure for data transport in the wireless communications system (100). A management system (160) monitors (302, 401) one or more KPIs and detects (308, 402) that the monitored KPIs indicate a key performance degradation. Network elements (151-156) associated with the transport network (150), and those at least potentially are involved in causing the key performance degradation, are identified. The management system (160) sends one or more requests to the identified network elements (151-156). The one or more requests request the identified network elements (151-156) to perform performance measurements and report results thereof to the management system (160). The performance measurements comprise measurements regarding the transport network (150).