Diameter Based online charging

Diameter online charging is a real-time charging feature. When an online charging subscriber requests access to data services, the online charging system (OCS) server determines whether to deliver quotas (volume, time, or number of events) based on the subscribers subscription data and account balance. When the subscriber is using data services, the OCS server monitors the usage of resources prepaid by the subscriber and deducts quotas from the account in real time. When the account balance is exhausted, services are terminated or the subscriber is prompted to recharge the account.