EHLR apparatus and method for realizing payment in advance

This invention discloses an EHLR (Enhance Home Location Register) device. It comprises the standard HLR (Home Location Register), the prepaid special data module, the accounting rate table, the accounting module and the module integrated the prepaid signaling processing; The invention also discloses a method for implementing the prepaid service. It includes: A) at the HLR adds the module integrated the special prepaid data used in PPC service, the accounting module, the accounting rates module and the module integrated prepaid signaling processing module, in order to form EHLR; B), EHLR receives the initial request message transmitted from calling SSP and analyzes it to decide if the user accounted is PPC user and if the balance of the accounted user is positive, if yes, EHLR looks up the user data in the module integrated the special prepaid data and makes signaling interaction with SSP, and while the calling user.