Proxying location update for idle mode interfaces

In cellular networks it is the mobile node's responsibility to update the network about its location change, especially when this one enters idle mode. We developed a new framework [8] where the idle interface is powered-off to save energy and thus could neither detect its location change nor perform a location update. This framework uses a proxy entity at the network and at the mobile node the active radio interface for proxying the idle interface. In this paper, we present an approach that relies on the proxy entity and the active interface for proxying the location update procedure of the proxied interfaces. More specifically, we propose two algorithms. The first algorithm considers proxying periodic location update of idle interface without considering its mobility if there is any. The second algorithm is based on sending the location to the Information Server which determines the list of paging/tracking areas that serves the current location. We present the design of our architecture for 4G systems, namely WiMAX and LTE. The algorithms are analytically evaluated to evaluate the power savings compared with single-radio power management.