Performance Evaluation of WIMAX Network with High QOS Services Incorporating Different Physical & Mac Layer Standards

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1 Performance Evaluation of WIMAX Network with High QOS Services Incorporating Different Physical & Mac Layer Standards 1. Anita Mishra, NehaMarria 2, Harsukhpreet Singh 3 1 PIT,PTU,Jalandhar,Punjab,India 2 College of Engineering & Management, Assistant Professor, PTU, Kapurthala, Punjab,India 3 CTIT, Assistant Professor,PTUJalandhar,Punjab,India ABSTRACT VoIP application of Worldwide Interoperatability microwave access (WiMAX) is a broadly deployed technology and has a great impact in field of 4 th generation networks. Main advantage of this technology is utilization of existing infrastructure in the form of internet connection. There are several QoS classes for VoIP application in IEEE systems, such as unsolicited poll grant, rtps, nrtps, Ertps and BE. The major issue in VoIP is quality of service. In order to send better quality in voice data s5ome factors like delay, jitter, throughput, packet delivery ratio and mean opinion score (MOS) need to be improved so as to maintain the performance of this application in WiMAX.The proposed idea required no modification of the framework of IEEE system and we have analyzed and discussed the performance of the quality of service classes recommended in the IEEE system and compared it with proposed approach.the approach proposed in the thesis considers the parameters of Peak Sustained Traffic Rate and Orthogonal Frequency Division Multiplexing (OFDM) frame duration to improve the quality of service for VoIP. The simulation of VoIP has been done with Peak Sustained Traffic Rate OFDM frame duration with these parameters values the performance metrics delay, network load and jitter have been improved which in turn has enhanced the performance of existing Extended Real Time Polling Service. Keywords:-VoIP, MOS, rtps, nrtps, Ertps, QoS, OFDM 1.INTRODUCTION The increasing demand for large capacity and higher transmission speeds to accommodate for data intensive multimedia in conjunction with real time, the wireless network have experienced an explosive growth in last few years [1-2]. WiMAX stands for Worldwide Inter- Portability for Microwave Access can be a communication technologyfor easily delivering high speed data rates to large geographical area using orthogonal frequency division multiplexing(ofdm) from Base Station(BS) to Subscriber Station(SS) which mitigates noise, multipath and interference effects[3-4]. The WiMAX network is a combination of BS and SS. Here the packets are transferred from source node to destination node after following various scheduling, modulation technique and routing technique. In compliance with IEEE the maximum range of WiMAX network is 50 km from the BS, where the responsibility of the base station of providing the air interface to the master stationwith supplementary functions that may be part of the BS are micro mobility management functions, traffic classification, tunnel establishment, QoS policy enforcement, key management, DHCP proxy, multicast group management and session management. The receiver and antenna could be a small box or personnel computer Memory Card International Association (PCMCIA) card or a laptop[5-6]. With the introduction of 4G technology in WiMAXoffering a metropolitan area network services that can use one or more BS and each BS provide the service to the users up to 50 km radius for spreading broadband wireless data over spacious geographical area. WiMAX offer high speed, flexible, inexpensive and last mile services with performance similar to those of wire line infrastructure T1, DSL, cable modem based connections, optical fiber orcopperware with a number of QoS needs. WiMAX provide wide area coverage and QoS capabilities for ranging from real time delay-sensitive Voice Over Internet Protocol(VoIP) to real time streaming video and non-real time downloads, ensuring that subscribers obtain the performance they expect for all types of communication with a bandwidth support of up to 10 MHz[7-8].based on IEEE standards, WiMAX provide up to 30 miles broadband access to mobile users having a telecommunication etiquette offering full access to mobile internet across cities and countries with a wide range of devices. WiMAX technology is offering very high speed broadband access to mobile internet. Generally 10MHz with the TDD scheme provides 3:1 up and down link ratio. The architecture of WiMAX technology is based on MAC layer which is a connection oriented layer. Through MAC layer a user can perform a variety of functions such as various types of including multimedia and voice can be used. it also supports best efforts for data traffic as bit, real time, traffic flaws etc. the aim of design WiMAX technology is to facilitate large number of user with a variety of connection per terminal[9-10]. Volume 4, Issue 4, April 2015 Page 183

2 This paper is divided into five sections. Some introductory application and characteristics area of WiMAX technology are presented in Section 1 followed by Section 2 that presents the QoS needs and IEEE QoS scheduling schemes of WiMAX technology, proposed methods and flow chart present in section 3 and in section 4 simulations results are shown and finally, the conclusion is reported in Section 5. 2.QOS AND IEEE QOS SCHEDULING SCHEME QoS is a spacious and unbound term that refers to the collective effect of service, as perceived by the user. QoS more barely refers to meeting certain necessity typically, packet delivery ratio, throughput, network load, packet error rate, jitter, and delay associated with a given application. WiMAX networks must support a diversity of, such as video, voice, multimedia and data and each of these has different traffic patterns and QoS necessity [20].The QoS is granted on the basis of type of application and service under consideration. For example, a user sending an needs no real-time data stream like another user having a Voice over IP (VoIP) application. To provide the service parameters respectively, the traffic management is necessary. There are four main service classes named as UGS, rtps, nrtps, BE but there is a fifth type QoS service class which is added in e standard, named as: extended real-time Polling Service (ertps). These services are prioritized in decreasing order. Within all these classes of services resources are allocated to manage and satisfy the QoS of higher priority services. In general, IEEE has five QoS classes [7]. Table 1 broadly classifies various service classes defined in WiMAX and its. Table I.QoS Classes in WiMAX Service classes Description Application Unsolicited Grant service(ugs) For constant Bit rate and delay dependent s VOIP Real Time Polling Service (rtps) Extended Real time Service (ertps) For variable rate and delay dependent For variable rate and delay dependent Streaming audio, video VOIP and Silence Suppression Non real time polling service (nrtps) Variable and non real time FTP Best Effort (BE) Best effort , Web,Traffic UGS:Unsolicited Grant Service is design to support real time service flow which generates the fixed size data packet periodically. In this algorithms BS assign fixed size grant to the subscriber station. The grants assign are basically of two type i.e. grant size and grant period. When voice session is initialized then these values are conciliated. These grants are sufficient for sending data packets. Advantages of UGS: this service minimize the MAC overhead and uplink access delay which are caused when SS make request to the BS for bandwidth request to send the voice data packets. Disadvantages of UGS:UGS assign fixed size grant for sending voice data packets but voice user do not always have voice data packet to send because they have period of silence and it cause a waste of uplink resources. rtps: Real time polling service are designed to support real time services which generally generates variable size data packets periodically. BS assign uplink resources to the SS when voice session is initialized then these values are conciliated. Advantages: In this algorithm the SS request the BS for bandwidth of suitable size grant so that the rtps can transport data more efficiently as compare to UGS algorithms. Disadvantages: Because the SS always made a request for Bandwidth to the BS which in turn can cause more MAC overhead and uplink access delay as compare to UGS algorithms. ertps: Extended Real Time Polling Services algorithm is proposed in order to remove the shortcomings of both UGS and rtps algorithms. The UGS approach allows BS to assign fixed size grants to voice users which leads to wastage of uplink resources during the silent period when voice users do not have any datato send. Meanwhile rtps Volume 4, Issue 4, April 2015 Page 184

3 although meant for variable size data packets consumes much of the time in polling process and also account for MAC overhead. 3.PROPOSED METHODOLOGY Volume 4, Issue 4, April 2015 Page 185

4 4.SIMULATION SCENARIO AND RESULTS Using OPNET 14.5 simulator, we have designed and investigated WiMAX scenario with network size of [20*20 km] with 45 number of fixed nodes. The work is demonstrated using high network traffic load i.e. with VOIP for simulation interval of 5 minutes. Fig 1: WiMAX Network Scenario Table II: SIMULATION PARAMETERS for WiMAX BS Transmit Power (W) 0.5 Traffic Load VoIP No. Of subcarrier stations 45 Base Station MAC 22 Address SS Station MAC Address Auto Assigned WiMAX Efficiency Mode Physical Layer Enable BS, SS Antenna Gain 15, 14 dbi Channel Bandwidth 20MHz OFDM Sub-carriers 512 Frame Duration 5 ms 3.1 Performance Results After a number of simulations, the following results were gathered. Based upon these results, a detailed analysis is presented. QoS on WiMAX network is analyzed through simulation metrics. The metrics which we taken are below:- Delay: Delay or latency could be defined as the time taken by the packet to reach from source to the destination. The results are shown graphically as: Volume 4, Issue 4, April 2015 Page 186

5 Fig.2 End-to-End Delay Vs Transmission time Jitter: packet delay variance or jitter could be termed as the variation in delay or packet delay variation. The value of jitter is calculated from the end to end delay. It is the variation in the time between packets arriving. The results are shown graphically as: Fig.3 WiMAX Voice Jitter Vs Transmission Time Network Load: In a computer network the load is a measure of the amount of computational work that a computer system performs. The aim of the network load balancing to optimize resources use, maximize throughput, minimize response time and avoid overload of any one of the resources.the results are shown graphically as: Fig. 4 Network Load Vs Transmission Time Volume 4, Issue 4, April 2015 Page 187

6 Table III:Comparison of Proposed Method with the Existing QoS classes Delay (msec.) Network Load (kbps) Jitter (msec.) BE ertps nrtps rtps Optimized ertps CONCLUSION Measurement of Quality of Service is critical for any WiMAX network. The WiMAX network must assemble a number of quality of service parameters including low delay, jitter, network load, high throughput and packet delivery ratio. Today in broadband wireless access the observation is that as adoption grows, so does the need for guaranteeing a good QoS. The issues of QoS there have become a critical area of concern for supplier of broadband wireless access equipment and their customers too. In this paper we have conducted general simulation to estimate the performance of WiMAX for supporting VoIP traffic we have analyzed several important critical paramerts such as end-to end delivery, jitter and network load. Simulation results shows that we have obtained low delay, jitter and network load. REFERENCES [1] Andrews; J.G; A. Ghosh and R. Muhamed, Fundamentals of WiMAX: Understanding Broadband Wireless Networking. Prentice Hall, Englewood Cliffs, NJ. [2] Cicconetti, C.; Lenzini, L.; Mingozzi, E.; Eklund, C., "Quality of service support in IEEE networks," Network, IEEE, vol.20, no.2, pp.50,55, March-April 2006 doi: /MNET [3] Chakraborty, M. and D. Bhattacharyya, 2010, Overview of End-to-end WiMAX Network Architecture,WiMAX Security and Quality of Service, Head, Department of Information Technology, Institute of Engineering and Management, Salt Lake, Kolkata, India. [4] Grønsund, P. and P. Engelstad, The physical performance and path loss in a fixed WiMAX deployment. In: Mohsen, G. and C. Hsiao-Hwa. Proceeding of International Wireless Communications and Mobile Computing Conference (IWCMC 07). Honolulu, Hawaii, USA. [5] Grondalen, O.; Gronsund, P.; Breivik, T.; Engelstad, P., "Fixed WiMAX Field Trial Measurements and Analyses," Mobile and Wireless Communications Summit, th IST, vol., no., pp.1,5, 1-5 July 2007 doi: /ISTMWC [6] Grewal, V. and A.K. Sharma, On performance evaluation of different QoS mechanisms and AMC scheme for an IEEE based WiMAX network. Int. J. Comp. Appl., 6(7). [7] Howon Lee; Taesoo Kwon and Dong-Ho Cho, An Enhanced Uplink scheduling Algorithm based on Voice Activity for VoIP Services in IEEE d/e System, IEEE communication letters, Vol. 9, No. 8, August [8] IEEE Std , IEEE Standard for local and metropolitan area networks Part16: Air Interface for Fixed Broadband Wireless Access Systems. ISBN: [9] IwanAdhicandra, Measuring Data and VoIP Traffic in WiMAX Networks,journal of telecommunications, volume 2, issue 1, april 2010 [10] Ibrahim A. Lawal; AbasMd Said and AbubakarAminuMu azu, Simulation Model to Improve QoS Performance over Fixed WiMAX using OPNET, Research Journal of AppliedSciences, Engineering and Technology 6(21): , ISSN: ; e-issn: , Maxwell Scientific Organization, 2013 [11] Martufi; G.K.; M. Neves; P.M. Curado; M. Castrucci; P. Simoes; E. Piriand and K. Pentikousis, Extending WiMAX to new scenarios: Key results on system architecture and test-beds of the WEIRD project.proceedings of the 2 nd European Symposium on Mobile Media Delivery (EUMOB). Oulu, Finland. [12] Mohammed A. Mohammed; Fayez W. Zaki; and Rania.H. Mosbah, Improving Quality of VoIP over WiMAX, International Journal of Computer Science and Information Security, Vol.9, Issue 3, No.3, May 2012 [13] M.A.Mohammed; F.W.Zaki and A.M.Elfeki, Performance Anayysis of Scheduling Algorithms for VoIP Services in IEEE System, International Journal of Computer Science, Vol.9, Issue 6, No.3, November 2013 [14] Nee, R.V. and R. Prasad, OFDM for Wireless Multimedia Communications.Artech House Publishers, University of Michigan U.S.A., pp: Volume 4, Issue 4, April 2015 Page 188

7 [15].Raman, B.; Chebrolu, K., "Experiences in using WiFi for rural internet in India," Communications Magazine, IEEE, vol.45, no.1, pp.104,110, Jan doi: /mcom [16] R. K. Jha, A. V. Wankhede and U. D. Dalal, A Survey of Mobile WiMAX IEEE m, International Journal of Computer Science and Information Security, Vol. 8, No. 1, 2010, pp [17] R. K. Jha, A. V. Wankhede and U. D. Dalal, WiMAX System Simulation and Performance Analysis under the Influence of Jamming, International Journal of Scientific Research, Vol. 1, No. 1, 2010, pp [18] Rakesh, K., J. Idris, Z. Bholebawa and D. Upena, Location based performance of WiMAX network for QoS with optimal BSs. Wirel. Eng. Technol., 2: [19] S. Sengupta, M. Chatterjee and S. Ganguly, Improving Quality of VoIP Streams over WiMAX, IEEE Transactions on Computers, Vol. 57, No. 2, 2008, pp doi: /tc [20] Safa, M. and M. Watfa, Quality of Service in Wireless Local and Metropolitan Area Networks.Auerbach Publications, CRC Press, Taylor and Francis Publishers. [21] Vikram,M. and Dr.Neena Gupta, Performance Analysis of QoS Parameters for Wimax Networks.International Journal of Engineering and Innovative Technology (IJEIT) [22] UpenaD.Dalal and Y.P.Kosta,2009. WiMAX New Development. Volume 4, Issue 4, April 2015 Page 189