TCP-like Threshold Window (TCP-like TW) is a new congestion control mechanism for Datagram Congestion Control Protocol (DCCP) over long delay link network, designed to ease the problems in DCCP. As TCP-like TW is based on the TCP-like, one of the congestion control mechanisms for DCCP, it is for the transmission of abrupt changes and bursty streaming multimedia data traffic over the networks. However, TCP-like causes problems when delivering multimedia data over long delay link. Two approaches have been used for TCP-like TW, i.e. The setting of appropriate slow-start threshold size and congestion windows manipulation during congestion avoidance phase. It has been developed and implemented in Network Simulator 2 (ns-2) and has proven to enhance the performance of DCCP when delivering multimedia data over long delay link networks.