Today's modern era of high speed multimedia transmission is demanding faster data transmission of huge amount of data. As a result data traffic is growing faster than capacity of exciting network. So it becomes inescapable to deal with Congestion control. Various congestion protocols are used for avoiding congestion in network. TCP is the most popular congestion protocol in the Internet but it has some limitations, such as fail to utilize network link optimally in high bandwidth-delay product networks, and come out with high load and overhead in the network.