Method and system thereof for realizing paging in local IP access

The invention provides a method and a system thereof for realizing paging in local IP access. When an external data network sends downstream data to UE which is connected to a home network or Internet through a femtocell and UE is idle, the femtocell can trigger the paging to the UE in a local IP access network, wherein the external data network can be a home inner network or Internet. Through the method, the transmission of downstream data from the home internet or Internet to the idle UE is realized in the local IP access, and the UE is ensured to normally receive the downstream data.