Its main purpose is to protect network resources from malicious as well as unintentional misbehavior, which can affect the QoS of other already established connections, by detecting violations of negotiated parameters and taking appropriate actions. Such actions may include cell discard and cell tagging. Accounting management should take into account these actions. Performance management concerns the evaluation of how well the system is carrying out its designed functions through continuous performance monitoring and reporting. Performance management records all kinds of statistics including cell-counts before and after UPC actions.
Cell counts can also be useful for accounting management.