2010 Volume 7 Issue 9 Pages 652-658
In power-efficient WLAN/cellular dual mode mobile station (MS), WLAN interface is basically turned off when it is not actively transmitting or receiving data because idle state power consumption of WLAN interface is significant and it is much higher than that of cellular interface. Since only cellular interface is turned on to maintain reachability, if a VoIP call is arrived at WLAN it is notified through less power-consuming cellular interface. The paging via cellular interface for VoIP call, however, generates significant signaling load at radio interface because paging has to be performed to all cells within a registered cellular registration area (RA). In this paper, we reduce signaling load of power-efficient WLAN/cellular networks by paging cells only containing WLAN using the network coverage information between WLAN and cellular network, without degrading the performance of power consumption. Numerical results show that the signaling load of power-efficient integrated WLAN/cellular networks is significantly reduced.