International Journal of Innovative Research in Computer Science & Technology (IJIRCST) ISSN: 2347-5552, Volume-3, Issue-1, January – 2015 89 Meliorate QOS of WIFI-WIMAXin Backhaul Networks Ekta Singla, Parminder Singh Abstract: Wireless access networks are developing at a very rapid rate. They are convenient in providing Internet access in remote inaccessible areas thatconfront for traditional wire- line service providers. Wireless communication provideslesser cost, wider support for massive users and conveniently accessible fordifferent users but on the other hand these are considered less efficient and irregular as compared to the wired networks that make end-to-end quality of service (QOS) provision a challenge for wireless networks.Wireless access networks are widely accepted and continuously advancing by expanding their coverage, bandwidth and QOS services. Commonly used wireless standards are IEEE 802.11 (Wi-Fi) and IEEE 802.16 (WiMAX). IEEE 802.11 (Wi-Fi) is a standard that provides high speed WLAN connectivity such as in buildings, homes, hotels, cafes and airports. Wi-Fi networks are possibly the most widely used and accepted technology by providing the highest transmission rate among standard wireless networking.IEEE 802.16 (WiMAX) is a standard to provide high speed transmission in both indoor and outdoor environments.Moreover, it is innovative and commercially viable alternative in last mile implementations to cable modems, DSL technologies and T1/E1 cables. This paper provides detailed technical differences between the 802.11 and 802.16 and also discusses the QOS Service classes of WiMAX network. The simulation consequenceshave been beholding with network simulator allinone-3 and investigating the performances of the overall network. Index Terms: WiMAX, Wi-Fi, QOS, backhaul networks, Wireless Networks, Scheduling Algorithms. I. INTRODUCTION Wireless networks connect various devices such as laptops, mobiles, PDAs and tablets to the Internet using radio waves. They are gaining popularity day by day as they are easy to set up and inexpensive. There are some inbuilt qualities of wireless communication systems like mobility, reachability, simplicity, maintainability, roaming services, new smart services etc [6].Wireless is a more modern alternative to traditional wired networking that relies on cables to connect networkable devices together. Wireless technologies are widely used in both home and business computer networks. Two major wireless techniques are IEEE 802.11x and IEEE 802.16x. WiMAX and Wi-Fi networks use IP-based technologies to provide connection services to the Internet. Manuscript received January 25, 2015. Ekta Singla, Department of Information Technology, Chandigarh Engineering College, Landran-140307, India Parminder Singh, Department of Information Technology, Chandigarh Engineering College, Landran-140307, India These technologies provide Internet access in countries without any wired network infrastructure and main aim is to provide convenient, affordable broadband wireless access to users in more areas. A. Wi-Fi The common name of the IEEE 802.11 is Wi-Fi (Wireless Fidelity). It is a synonym of Wireless Local Area Network (WLAN). It is the most widely used broadband wireless networking technology, providing the highest transmission rate among standard-based wireless networking technologies. Wi-Fi enabled devices (like Smartphones, tablets, video game consolers etc.) can connect to network resources like the Internet through a wireless network access point. Access points are also known as hotspots have a coverage area of about 20 meters indoor and even a greater range outdoors [7]. Wi-Fi standard 802.11a and 802.11g provides transmission speed up to 54 mbps. 802.11n can achieve speeds as high as 140 mbps and 802.11 ac is the newest standard, and can provide a transmission speed of 450 mbps. Wi-Fi Standards: 802.11a was the first wireless networking standard, but IEEE 802.11b was the first widely accepted one, which is followed by IEEE 802.11g and IEEE 802.11n [11].  IEEE 802.11a: It works in unlicensed 5GHz. It supports data rates from 6Mbps to 54 Mbps. It runs in the 5GHz range, so less interference from other devices. 802.11a does a great job of supporting multimedia applications and densely populated user environments.  IEEE 802.11b: It is deployed in 2.4GHz range and supports a maximum raw data rate of 11Mbps. IEEE 802.11b is longest, well supported, stable and cost effective technique but security is the main disadvantage of this standard.  IEEE 802.11g: 802.11g is an extension to 802.11b, but it operates at data rate of 54 Mbps within 2.4Ghz of spectrum band. IEEE802.11g is flexible because multiple channels can be combined for faster throughput, but limited to one access point and this is the main problem of IEEE 802.11g.  IEEE 802.11n: 802.11n is an amendment made in 802.11g standard by adding multiple-input multiple- output antennas (MIMO). It supports data rate of 300 Mbps and deploys on both 2.4 GHz and the lesser used 5 GHz.  IEEE 802.11 ac: It utilizes dual band wireless technology, supporting simultaneous connections on both the 2.4 GHz and 5 GHZ Wi-Fi bands and data rate