Abstract: The present invention relates to prepaid services in the communication field. A method for charging a prepaid account includes: delivering the available traffic to the NAS based on the available balance of an account shared by the user and other users in response to a successful authentication of a user's access request; and delivering the available traffic to the NAS based on the available balance of the account shared by the user and other users in response to a receipt of an Accounting-Request-Interim message from the NAS. The solution provided by the invention may deliver the available traffic to a user every accounting period so that an account can be used by multiple users concurrently, whereas overdraft does not occur. The present invention also provides a system and an AAA server for charging a prepaid account.

Abstract: The invention discloses a method for network service authentication. The method includes: an AAA server receiving a network service authentication request which contains a user access device identifier; the AAA server determining whether the user is allowed to use the requested network service according to the user access device identifier and a preset correspondence between user access device identifier(s) and network service(s). The invention also discloses an apparatus and system for network service authentication. Based on the invention, a user's right to use the network service may be authenticated according to the user access device.

Abstract: The present invention relates to prepaid services in the communication field. A method for charging a prepaid account includes: delivering the available traffic to the NAS based on the available balance of an account shared by the user and other users in response to a successful authentication of a user's access request; and delivering the available traffic to the NAS based on the available balance of the account shared by the user and other users in response to a receipt of an Accounting-Request-Interim message from the NAS. The solution provided by the invention may deliver the available traffic to a user every accounting period so that an account can be used by multiple users concurrently, whereas overdraft does not occur. The present invention also provides a system and an AAA server for charging a prepaid account.