The Huawei smart bandwidth management solution enables carriers to increase
their revenue by providing customized service policies and tariffs to
subscribers. This solution provides carriers with the following
measures to improve user experience, and encourage the use of services
by subscribers:

• Subscribers are generally concerned that they may
  incur huge bills if they unknowingly use more data than the limit
  specified in their monthly data plan. To address this issue, the unified
  policy and charging controller (UPCC) collects the accumulated
  data usage for subscribers who have not subscribed to a flat monthly
  rate, and sends a short message service (SMS) or email notification to
  subscribers when their data usage reaches a specified threshold. This
  prevents subscribers from experiencing
  bill shock and subscribers are more willing to use services.
• Carriers
  can redirect subscribers who have exhausted their quota before the end
  of the month to an account recharge website, where subscribers can
  purchase temporary data plans to continue to use broadband network
  resources. By doing this, carriers
  can encourage subscribers to continuously use services, and increase
  their revenues

documentation very useful for my job

Subscriber-Specific PCC Based on Accumulated Traffic Volume is very useful to control the user usages.

can i have a bit more

useful document, thanks