A method for finding and selecting an access network for a user equipment in a heterogeneous network

The present invention provides methods for discovering and selecting the user equipment in an access network in a heterogeneous network. In the present invention, the user equipment sends a request message to the ANDSF, which comprises at least a user equipment identifier recently cellular network and the residence time in the cell recently cellular network cell. ANDSF determine at least a moving speed of the user equipment according to the type of user equipment identifier recently cellular network and the residence time in the cell recently cellular network cell; policy to at least a mobile user equipment is provided between the moving speed of the system in accordance with the type of the access network find information between systems and routing policy. Whereby the various types of access networks comprising heterogeneous network to achieve a reliable estimate of the movement speed of the user equipment, and the ANDSF based on the moving speed can be precisely and reliable inter-user equipment for a mobile system policy is provided, the access network discovery between information systems and routing policy to reduce frequent inter-RAT handover and handover failure to provide a better user experience.