IJSRSET11734125 | Received : 15 August 2017 | Accepted : 29 August - 2017 | July-August-2017 [(3)5: 534-537] © 2017 IJSRSET | Volume 3 | Issue 5 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section: Engineering and Technology 534 TCP Congestion Window Based Roll Back Approach for Improving Congestion in 4G LTE Network Using NS-3 Simulator Prof. Santosh Pawar, Rajshree Verma Central India Institute of Technology, Indore, Madhya Pradesh, India ABSTRACT The Long Term Evolution (LTE) of the UMTS Terrestrial Radio Access and Radio Access Network is another correspondence standard went for business arrangement in 2010. Objectives for LTE incorporate backing for enhanced framework limit and scope, high top information rates, low idleness, lessened working expenses, multi- recieving wire support, adaptable transfer speed operations and consistent mix with existing systems.The point of this proposal is to study the effects on the end-client and framework execution when clients with high bit rates tcp administrations are traveling through the system. These effects influence the decreased end-client or framework throughput, e.g., because of clogging in the vehicle system, prompting poor usage of the vehicle and radio assets accessible. To reach such a point, it has been important (1) to make another test system with the ns-3 and perform reenactment in diverse system settings and (2) define a quick recuperation approach ready to catch the essential flow of the genuine framework and to keep away from blockage circumstance. Conceivable answers for relieve the effects are researched by contrasting the recreations consequences of tcp execution in the radio and transport system and we perform Fast recovery in TCP Stream. Keywords: LTE, UMTS, TCP I. INTRODUCTION The recent increase of mobile data usage and the emergence of new applications, such as Multimedia Online Gaming (MMOG), mobile TV, Web 2.0, streaming contents, have motivated the 3rd Generation Partnership Project (3GPP) to work on the Long Term Evolution (LTE). LTE is the latest standard in the mo- bile network technology tree, which previously implemented the GSM/EDGE and UMTS/HSxPA network technologies now account for over 85% of all mo- bile subscribers. LTE will ensure 3GPP’s competitive edge over other cellular technologies. LTE, whose radio access is called Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), is expected to substantially improve end-user through- puts and sector capacity also to reduce user plane latency, bringing significantly improved user experience with full mobility. With the emergence of Internet Protocol (ip) as the protocol of choice for carrying all types of traffic, LTE is scheduled to provide support for ip-based traffic with end-to-end Quality of service (QoS). Voice traffic will be supported mainly as Voice over ip (VIP) enabling better integration with other multimedia services. Initial deployments of LTE are expected by 2010 and commercial availability on a larger scale 1-2 years later. Unlike High Speed Packet Access (HSPA), which was accommodated within the Release 99 UMTS architecture, 3GPP is specifying a new Packet Core, the Evolved Packet Core (EPC) network architecture to support the E-UTRAN through a reduction in the number of network elements, simpler functionality, im- proved redundancy but most importantly allowing for connections and handover to other fixed line and wireless access technologies, giving the service providers the ability to deliver a seamless mobility experience.