Revised Backward Explicit Congestion Notification Algorithm for TCP/IP
Shengming Jiang · Science Technology and Engineering · 2007
The combination of explicit congestion notification (ECN) and active queue management in routers (AQM) was introduced to improve the performance of congestion control in TCP/IP. Backward ECN (BECN) suggests a congested router to directly return the congestion information to the sender through ICMP source quench (ISQ) messages to reduce the reaction time to congestion. But, in BECN the shrinking degree to the congestion window is insufficient by reducing only one for each arrival of an ISQ packet, which effects the congestion release efficiency. This study proposes that linear decrease (LD) is replaced by multiplicative decrease (MD), i.e., the congestion window is multiplied by a fraction less than 1. The simulation result shows that BECN/MD outperforms BECN/LD remarkably.