In this paper work, we focuses on TCP sender side mechanisms and appropriate buffer management algorithm to handle higher offered load, random losses and retransmission timeouts in high delay networks in such a way as to keep congestion window as high as possible, while keeping the congestion under control and keep retransmissions to minimal. | ISSN:2249-5789 Ashish Chhabra et al , International Journal of Computer Science & Communication Networks,Vol 4(3),67-75 Performance Evaluation of Variants of TCP Based on Buffer Management over WiMAX Ashish Chhabra Research Scholar, (CSE) MVEC, Jagadhri-India Affiliated to Kurukshetra University Email ID: ash1491@ Ankush Dhiman Research Scholar, (CSE) MVEC, Jagadhri-India Affiliated to Kurukshetra University Email ID: Mauli Joshi Assistant Professor in Computer Science & Engg MVEC, Jagadhri-India Affiliated to Kurukshetra University Email ID: Abstract Currently, Worldwide Interoperability for Microwave Access (WiMAX) is one of the hottest technologies in wireless based on the IEEE wireless technology which offers high throughput broadband connections over long distance that supports Point to Multi-point (PMP) broadband wireless access. In this paper work, we focuses on TCP sender side mechanisms and appropriate buffer management algorithm to handle higher offered load, random losses and retransmission timeouts in high delay networks in such a way as to keep congestion window as high as possible, while keeping the congestion under control and keep retransmissions to minimal. The TCP proposed mechanisms are assessed against TCP New Reno, TCP Westwood, and TCP CUBIC to view how they fare against congestion under higher mobility speed. Ns2 simulator is selected as the simulation tool because of the ease of use of the graphical interface provided and extensive support of TCP. 1. Introduction WiMAX is an acronym for Worldwide Interoperability for Microwave Access. It is based on OFDMA (Orthogonal Frequency Division Multiple Access) technology that offers preferable spectral efficiency as well as overall capacity than the 3G network currently being deployed. The main motive of WiMAX is use to support multiple services such as multimedia broadcasting, web browsing, video streaming and .
