CMT is exploited for data transmission between M2 M gateway and M2 M server. However, CMT cannot identify packet loss reasons in the heterogeneous wireless environment. Based on path congestion status, this paper proposes a loss detection mechanism called CMT-SC to solve this problem. CMT-SC utilizes steady parameters(S parameters)and congestion parameters(C parameters)to estimate the path status based on round trip time. According to S parameters and C parameters, CMT-SC divides the packet loss type into w...