The booming growth of data communication makes the IP and high-speed dada services as the future trade of the mobile communication.Making the best of the characters of 2G/TD-SCDMA and WLAN and merging them is one of effective methods to settle the data communication service status.In this paper
based on the merging desire of WLAN and 2G/TD-SCDMA
the merging schemes are compared
and the strategy of merging evolution is discussed.Furthermore
the authentication and billing strategy in the evolution is analyzed.