As the development of societies and progress of technologies

people’s requirements to telecommunications information services increase. Particularly

as the appearance of multimedia services

the multimedia services’ characteristic of variable bit rates requires telecommunications networks to adapt its speeds quickly to support this kind of services within entire network. Current network technologies are not able to provide the capability. The need of development of telecommunications services induces telecommunications transfer. Moreover

the occurrence and ceaseless progress of Internet threatens the survival of telecom- munications industry. The challenge from heterogenous technology produces huge drive which induces telecommunications transfer.