Patent ID: 7899064

Claim:
A paging method in a system for informing a second terminal on a second network of data transmission from a first terminal on a first network under a plurality of heterogeneous wireless network environments connected to at least two networks, the system paging method comprising: (a) the system receiving a packet from the first terminal on the first network; (b) mapping a destination IP address of the packet from the first terminal with an IP address in a binding list, wherein the binding list stores location information including IP addresses of terminals registered on the plurality of heterogeneous wireless network environments; (c) selecting a predetermined network to which the second terminal is connected when there is no IP address in the binding list as a result of the mapping of the IP address; and (d) the system transmitting a page message to the second terminal including information of the first network, on the predetermined network to which the second terminal is connected and requesting paging to the first network, wherein the second terminal opens a network interface based on a service option corresponding to the first network included in the page message transmitted on the predetermined network and receiving the packet from the first terminal using the opened network interface corresponding to the first network, and wherein the page message includes service options including paging reason for indicating reasons that the system performs paging to the second terminal.