Abstract:As a substrate protocol for real-time multimedia application, DCCP is featured by congestion control and unreliable transmission. However, the congestion control algorithm CCID2 in DCCP is still based on AIMD, which will cause bufferbloat, longer network delay, and jitters. Hence, such a Loss-Base model is no longer suitable for the high-BDP environment. In contrast, the BBR algorithm can effectively control the network delay, minimize the network queuing, and maintain high bandwidth utilization and low link delay even at a high packet loss rate. Therefore, it is suitable for the real-time multimedia applications with DCCP. This study adds a detection model for packet loss rates to the BBR algorithm after its introduction to DCCP and applies the congestion control algorithm in the model of delay and bandwidth product to addressing the above-mentioned problems. Compared with CCID2, the proposed algorithm reduces the average delay by 20% under heavy loads and can produce a large throughput at a high packet loss rate.