Abstract: CSCL system enables the learners distributed in different places to improve their achievements with shareable resources. However, the enormous data transmission and computing intensity in the session of different learners can result in the heavy load of a single server. Common load balancing techniques and scheduling algorithms are firstly introduced. Then, against the characteristics of CSCL system, a novel dynamic weighted round robin scheduling algorithm is proposed based on NAT load balancing technique and TCP Handoff mechanism to fulfill the balance of CSCL system.

Key words: CSCL, load balancing, dynamic weighted round robin, internet