Patent ID: 8213913

Claim:
An access gateway in communication with a plurality of access networks including a wireless access network, the access gateway comprising: a local cache residing in the access gateway; and a call session control function (CSCF) residing in the access gateway and in communication with the local cache; wherein the access gateway serves as an access point to a multimedia domain (MMD) system in a network; wherein the plurality of access networks further includes at least one of a wireless local area network (WLAN) and a femtocell network; and wherein the CSCF is configured to: receive from a mobile node a registration request including registration information; generate location information of the mobile node using at least a part of the registration information and an Internet Protocol (IP) address assigned to the mobile node, wherein the location information includes a physical location of the mobile node and the IP address is assigned to the mobile node by the access gateway; store the generated location information in an entry in the local cache created for the mobile node when the mobile node was registered; receive a location-based service request including identifying information from the mobile node, wherein the identifying information includes an identifier of the mobile node; if the location-based service request does not include current location information of the mobile node, retrieve the generated location information of the mobile node from the local cache using the identifier of the mobile node included in the identifying information; and use the generated location information to obtain location-based services on behalf of the mobile node.