The invention discloses a mobile communication system and method. The system is a heterogeneous integrated network system structure, wherein a cellular network is used as a main body of the structure; a CogMesh node is allocated in a hot cell of the cellular network; a CogAd-hoc node is allocated in a blind area of the cellular network; and the transmission of the cellular network is probably assisted by a newly allocated node with a recognition function. According to the mobile communication system and method, the problems of wireless spectrum resource shortage, network load distribution non-uniformity and the like in the cellular network are solved.