Abstract: A method and apparatus for supporting user mobility by allowing guest access in an Internet service network and a billing method based on the same are provided. The method for supporting user mobility by allowing guest access in an Internet service network includes the steps of: performing user authentication and querying a subscriber DB to determine whether a user is a host user or a guest user when a subscriber ID is inputted; querying the subscriber DB to determine whether there is an available bandwidth for the guest user when the user is the guest user; and querying the subscriber DB to provide a service package corresponding to the guest user when there is an available bandwidth for the guest user.

Abstract: Provided is a method and apparatus for guaranteeing QoS using end-to-end CAC in an Internet service network. The method includes the steps of: (a) performing a subscriber domain CAC by querying a subscriber DB to determine whether to admit a call based on available bandwidth information of a subscriber when a subscriber terminal requests resource reservation; (b) performing a network domain CAC by querying a resource DB based on a result of the subscriber domain CAC to determine whether a resource required for service can be reserved or not; and (c) updating reserved bandwidth information and available bandwidth information of a subscriber domain in the subscriber DB and resource use information of a network domain in the resource DB when the resource reservation is completed through the steps (a) and (b).