The invention discloses an online charging engine, a real-time charge off engine, and an online charging method and
system. The online charging method comprises the following steps: receiving an online charging request, obtaining
current user state information corresponding to a terminal identifier of a terminal, and performing
authentication on a service request according to the
current user state information, wherein the
current user state information is
user state information after the online charging
processing of the previous online charging request of the terminal is terminated, and an
authentication result of the service request is sent to a service
network element. By adoption of the online charging method, service
authentication and real-time charge off are
asynchronous processing procedures, the
response period of the service authentication is shortened, the
retention rate of the online charging flow of the user is improved, the working load of the
online charging system on service peaks is reduced, and thus the technical problem of large working load of the
online charging system on service peaks, relatively low
retention rate of the online charging flow of the user and influence to the service
perception of the user on the flow service in the prior art are solved.