A method for billing in a wireless communication system, according to an embodiment, includes: transmitting billing data to an upper entity; determining whether the billing data has been normally transmitted; and executing a supplementary operation based on a result of the determining.

The present disclosure relates to a method related to an online charging system for a cellular radio communication system. The method includes obtaining a notification that a refill action of a user account for the communication system is pending. The notification includes an identifier (vid) of a refill resource for the refill action. The method also includes inspecting a refill database updated by an account management function of the online charging system to determine whether the refill resource identifier is included therein, indicating whether or not the user account has been refilled based on the refill resource.

Systems and methods for an enhanced online charging system service are described. A first signaling message is received from an originating mobile station for transmission over a network to a destination mobile station, wherein the first signaling message includes a voice message or a data message. A request from a mobile switching center (MSC), Short Message Service Center (SMSC) or Telephony Application Server (TAS) is provided to an online charging system (OCS) to determine an account usage balance associated with the mobile station. When the OCS determines the account is associated with valid monthly prepaid wireless subscription plan, a first response message is received at the MSC, SMC or TAS. The first response message indicates to the MSC, SMC or TAS to not send, for a predetermined time period, further requests to the OCS to determine an account usage balance associated with the mobile station.