CONGESTION CONTROL TECHNIQUES AND PRINCIPLES IN COMPUTER NETWORKS: A SURVEY

摘要

Congestion control is one of the most important concerns in computer networks. There is a chance of inefficient usages of resources, possibly leading to network collapse if we do not use the proper congestion control algorithm. Therefore congestion control is an effort to readjust the performance of a network to fluctuations in the traffic load without adversely affecting user's perceived service quality. Computer networks are presently dominated by pure end-to-end feedback or implicit feedback congestion control. This approach has worked admirably but the networks are evolving and the traffic mix and amount has increased tremendously with the advent of multimedia applications in the Internet. Hence explicit help from within the network like switches or routers is crucial especially during congestion time. Active queue management (AQM) is a method which hand over congestion feedback from routers to end users. Explicit congestion notification (ECN) is an alternate approach which is more efficient because it does not have scalability problem. But the use of wireless devices in computer network have given interest to look for some methods related with explicit rate feedback. Explicit rate feedback congestion control can be made to scale if correct rate-calculation techniques is defined and used.