The scope of this technical report is to capture the results of a study that investigates if enhancements to the existing policy control architecture are needed in the area of usage monitoring control. The goals of the study are to derive possible requirements and architecture enhancements for:

1. Monitoring of service (s) / application (s) in more than one usage monitoring group;
2. Disabling a service (s) / application (s) from the existing usage monitoring group of services/group of applications;
3. Excluding the usage of a particular service (s) / application (s) from the accumulated usage for the IP-CAN session/TDF session;
4. Usage control for a subscriber group, e.g. the members of a family or a company subscriber, or a group of devices belonging to subscribers that share the same usage allowance threshold.

In addition, study the different proposed solutions for effective time based usage monitoring and how associated start and end of usage is defined.

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