关键词: 混合网络，SC I'P，拥塞控制，路径管理，丢包区分，链路不对称

Abstract: Traditional SCTP (Stream Control Transmission Protocol) has limitations when it is used in wired and wire- less hybrid network environment because SChP is designed to be used for transmission in wired networks and there arc many problems when it is applied in wired and wireless hybrid network environment, Transmission media carrying data presents a wide range of characteristics in wireless and wired hybrid networks, some of which may cause a degradation of SChP performance. hhe author first analyzed the major factors that influence SChP performance under wired and wireless hybrid network environment，and then concluded the main problems under this hybrid networks. Some research work about whether losses are due to congestion or to radio channel errors, congestion control, and path management and asymmetric paths are carefully analyzed and concluded. Finally, some possible research trends of the development of SChP over wireless and wired hybrid networks in the future arc proposed.

Key words: Hybrid networks, Stream control transmission protocol (SCTP)，Congestion control, Path management, Loss differentiation,Asymmetric paths