Online billing method and system based on user traffic volume

The invention provides an online billing method and a system based on user traffic volume. The online billing method is applied in a business operation support system, and the online billing method adopts the using frequency sliding window technology, pre-distributes usable traffic volume based on historical using amount of user business, realizes the function of online billing, reduces the repeat times from amount to the usable traffic volume during the online billing process and improves the billing efficiency, thereby leading the distributed initial traffic volume to be in line with the using habits of a user as far as possible, reducing the expected interaction times between a business control network element and the online billing system during the online billing process to a constant and reducing the concurrent pressure of the online billing system. The usable volume of the follow-up business in the conversation is computed by adopting the exponential backoff algorithm with a threshold, thereby reducing