Abstract: A method for configuring an Internet protocol (IP) address of a small cell includes determining whether the small cell has received authorization from a core network of a mobile operator, determining whether the core network has priority over a local network to connect to the small cell, obtaining a local IP address from a dynamic host configuration protocol (DHCP) function implemented in the small cell or in an access point of the local network of the small cell, and using a core network IP address assigned to the small cell by the core network when the core network has priority over the local network. The small cell determines whether the core network IP address is the same as the local IP address. When the core network IP address is the same as the local IP address, the local IP address of the small cell is changed.

Abstract: A method for configuring an Internet protocol (IP) address of a small cell includes determining whether the small cell has received authorization from a core network of a mobile operator, determining whether the core network has priority over a local network to connect to the small cell, obtaining a local IP address from a dynamic host configuration protocol (DHCP) function implemented in the small cell or in an access point of the local network of the small cell, and using a core network IP address assigned to the small cell by the core network when the core network has priority over the local network. The small cell determines whether the core network IP address is the same as the local IP address. When the core network IP address is the same as the local IP address, the local IP address of the small cell is changed.

Abstract: A femtocell authentication system includes a femtocell in communication with an Internet protocol multimedia subsystem (IMS) network. The IMS network includes a gateway and a first server. The femtocell includes a global positioning system (GPS) module to obtain geolocation information of the femtocell and transmit the geolocation information to the first server. The first server includes a storage unit and a signal processing unit, the signal processing unit compares the geolocation information with a predetermined geolocation range value in the storage unit and allows the femtocell access to the IMS network according to a determination by the signal processing unit that the femtocell is within the predetermined geolocation range of the IMS network.

Abstract: A femtocell authentication system includes a femtocell in communication with an Internet protocol multimedia subsystem (IMS) network. The IMS network includes a gateway and a first server. The femtocell includes a global positioning system (GPS) module to obtain geolocation information of the femtocell and transmit the geolocation information to the first server. The first server includes a storage unit and a signal processing unit, the signal processing unit compares the geolocation information with a predetermined geolocation range value in the storage unit and allows the femtocell access to the IMS network according to a determination by the signal processing unit that the femtocell is within the predetermined geolocation range of the IMS network.

Abstract: A method for reducing authentication time of a user equipment (UE) in an Internet Protocol multimedia subsystem (IMS) network using a Femto access point (AP) establishes a secure channel between the Femto-AP and a gateway of the IMS network, performs a Femto-AP authentication with an authentication, authorization, and accounting (AAA) server of the IMS network through the secure channel, and obtains a number of virtual Internet Protocol (IP) addresses. The method further performs an UE authentication with the AAA server through the secure channel if the UE is a designated equipment in a whitelist of the Femto-AP.