According to the DiffServ mechanism in IETF

we present an integrated pricing architecture consisted of access price

usage price and congestion price

which lead to an effective and real-time pricing method.With the method

different charging rates are applied to different service levels

and token-based congestion pricing policy works when sending rate exceeds what is specified in SLA contract

which urges customers to select suitable service level.Furthermore

customers can alternate service levels to maximize utilities when their burst sending rates lead to raised charging rates.Besides those

ISP can interfere to help distribute customers among different levels.Such an integrated pricing mechanism in which supply and demand dominate

and plan assists guarantees the network to be utilized effectively.Simulation verifies the equitableness

effectiveness and flexibility.