Performance Evaluation of TCP using AQM Schemes for Congestion Control

Internet is considered as the worldwide system of many computers and their networks which are linked together by wired or wireless media. Network is based on internet protocol suite which has a model known as Transmission Control Protocol/Internet Protocol (TCP/IP) and a set of protocols. Model consists of TCP and IP as major protocols at transport and network layer respectively. TCP deals with end to end transmission and reassembly of packets. It also focuses on reliable and orderly transmission of packets. There are many TCP variants which are used in communication, such as Reno, Binary Increase Congestion control (BIC) and Vegas. TCP poses many issues like end to end delay in communication, congestion, connection management between sender and receiver end points. Congestion being one of the important issues affects the Quality of Service (QoS) of network and reduces overall network performance because of buffering of data in queue. Different Active Queue Management (AQM) algorithms which handle congestion are Random Early Detection (RED), Proportional Integral controller Enhanced (PIE), Controlled Delay (CoDel). These algorithms efficiently drop the packets when the buffer gets full or when it is near to full based on packet drop signal or other mechanisms. The article discusses about the importance of the right choice of TCP and AQM variant, results have been obtained by practical setup using flent and netpef traffic generator. The proposed work considers the study of different TCP and AQM variants for effective congestion control. Comparative study is conducted by considering selected TCP variant along with different AQM techniques. It reveals that TCP BIC along with CoDel provides less Iatency, high throughput and minimum packet drops.