Due to the advances of wireless technologies, a variety of Radio Access Technologies (RATs) coexist. Under the heterogeneous RAT environment, mobile terminals such as smart phones, has are equipped with multiple wireless interfaces to support various RATs. However, the popularity of various wireless services causes lack of radio resources of wireless networks temporarily. This problem can be alleviated by common radio resource management (CRRM) for cooperating overlaid wireless networks. In this paper, we survey current standards for heterogeneous wireless networks to cooperate with each other and propose a novel CRRM architecture based on current standards.