System and methods for monitoring events associated with services of mobile devices

A method in an aggregator proxy function (APF) for providing a monitoring service, the method comprising:

• the APF in a first Public Land Mobile Network (PLMN) receiving a first event report transmitted by a monitoring function in the first PLMN, the first event report comprising first event information related to a monitoring event, and a request identifier;
• the APF in the first PLMN receiving a second event report transmitted by the monitoring function in the first PLMN, the second event report comprising second event information related to the monitoring event, and said request identifier;
• after receiving the first and second event reports, the APF in the first PLMN creating an aggregate event report comprising:
• (i) at least one of the received first event information and the received second event information and (ii) said request identifier;
• the APF in the first PLMN transmitting the aggregate event report to a report receiving function not in the first PLMN, wherein the report receiving function not in the first PLMN is one of:
• a Service Capability Exposure Function (SCEF) and a Home Subscriber Server (HSS) function;
• and
• the APF in the first PLMN generating charging information based on the first event report, the second event report, and/or the aggregate event report.