International Journal of Applied Engineering Research ISSN 0973-4562 Volume 13, Number 9 (2018) pp. 6545-6550 © Research India Publications. http://www.ripublication.com 6545 QoS Performances Evaluation for Mobile WIMAX Networks based on OPNET Ali Abdulwahhab Abdulrazzaq, Ahmed Jabbar Abid, Adnan Hussein Ali Middle Technical University, Technical Instructors Training Institute, Baghdad, Iraq. Abstract WiMAX is believed as a last mile wireless connection tool to offer flexible broadband facilities for ending users. The limitations and performances of WiMAX network have been considered for designing and then simulated by using OPNET, which based in this paper on many quality of services QoS parameters such as voice-packet end to end delay, as well as throughput. A simulation concentrated on two applications Light video, and heavy video at a square area and simulation time of about five minutes depending on multiple scenarios of WiMAX. A comparison made between WiMAX PCM voice with light video and heavy video data transmissions based on voice delay and throughput and shows the voice with heavy video has a delay less than the delay of voice with light video and the heavy video has larger throughput than light video. Keywords: Mobile WiMAX, QoS, OPNET, Light and Heavy Video. INTRODUCTION Worldwide Interoperability for Microwave Access (WiMAX) denotes to standards family of IEEE 802.16, it provides two forms of broadband access, fixed in addition to mobile access in telecommunications scenery. WiMAX runs in two band, licensed with 10GHz - 66GHz and unlicensed of 2 GHz - 11GHz frequencies for operation in Lines off Sight (LOS) plus Non-lines off Sight for each bands [1]. Originally, WiMAX was appointed by means of a solution for last miles broadband access, avoiding a major infrastructure estimations deal with arrangements of cables or DSL, Digital Subscriber Line. After that, Mobiles WiMAX qualified for fourth- generation (4G) requirements for data mobile networks challenging demands for subscribers that provides high data rates for Internet Protocol networks which is accomplished for proposing great Quality of Service (QoS) [2]. The technology of WiMAX considers as an Air Interface Standard which was quickly proved itself to show a key role for a fixed and mobile broadband for wireless MANs, and it’s a development technology as an orthogonal frequency divisions multiplexing (OFDM) is applied which activates sending resist for vanish the effect of multipath and reduces it. A high data rates and a confirmation of Quality off Services (QoS) providing by IEEE 802.16 standards had commercially prepared it possible for multimedia applications backing such as video on demand (VoD), videos telephony, videos gaming, as well as mobiles TV broadcastings[3]. Mobile WiMAX is an explanation for broadband wireless which assists convergence of both broadband networks, mobile and fixed, over a common radio access wide-ranging broadband technology and architecture of flexible networks. Mobiles WiMAX Airs Interface approves (OFDMA) for upgraded performances of multi-path environments, while Scalable OFDMA (SOFDMA) is presented in the form of IEEE 802.16e Modification to backing scalable frequency band-widths from 1.25 to 200MHz[4]. In wireless communication systems, many factors influence the features of the received signal, namely path loss exponent, the range between base stations interfering and an in-demand user, log-usual shadowing, Rayleigh fading of short time in addition to noise. For improving capacity of the system, a peak data rate besides coverage reliability must be modified, also the transmitted signal from or to a specific operator is adapted [5]. ARCHITECTURE OF WIMAX WiMAX System Description The WiMAX is a wireless Metropolitan network established with standards of IEEE 802.16-2004 and IEEE 802.16e-2005 that improve the standards 802.16-2004 with an enhancement of new structures for the system especially the mobility. WiMAX have two standards express both physicals and MAC layers as follows [6]: Physicals layers utilizes SOFDMA, with assigned frequency range of (2 - 11) GHz for NLOS and frequency band of (10 – 66) GHz for LOS. However most executed WiMAX networks can be found in the range of 3.5GHz and it backing channel bandwidth in the range (2 -20) MHz [7]. The base station (BS) of WiMAX may offer broadband wireless access of 30 - 100 miles (45 - 150 km) for mobiles stations and 300 miles (501 km) for fixed stations supported by maximum data rate of 70 Mbps for 20 MHz BW [8]. Then MAC layer is intended for backing packets transmission band both protocols ATM and IP. The structure of MAC's layer includes three subs- layers; the security, the common part, and MAC convergence sub-layer. WiMAX abilities to direct a constantly increasing requests for wireless high speed data mobile within a networks of fourth- generation (4G). WiMAX planning to increase the growing rates of subscriber and intended carrier experiences worldwide [9].