A Distributed QoS-Oriented Model to Improve Network Performance for Fixed WiMAX

Worldwide Interoperability for Microwave Access (WiMAX) is a promising wireless technology based on the IEEE 802.16 standards that provide high-speed and reliable communications in large areas up to 30 miles (50 km). In our research a Distributed Quality of service (QoS)-oriented Model was developed to improve Network Performance for Fixed WiMAX. Two models were analyzed based on Centralized and the New Distributed Master-Slave models. The first model comprised of three (3) Base Stations (BS) and thirty Subscriber Station (SS) without Master-Slave BS while the new distributed model includes Master-Slave BSs selected by the designed algorithm (Nearest Neighborhood Algorithms). Simulations run while increasing the same number of BSs, SSs and masterslaves BSs the in New Distributed model using point-to-multipoint connection with multicast transmission based on Orthogonal Frequency Division Multiplexing (OFDM) techniques. The design has been evaluated using the simulation tool OPNET modeler 16.0. Comparing the results obtained from the two simulated models, it shows significant increase in the network throughput and drastic decrease in network delay and application response time which greatly enhances the performance of QoS.

[1]  Iti Saha Misra,et al.  Performance study of mobile WiMAX network with changing scenarios under different modulation and coding , 2011, Int. J. Commun. Syst..

[2]  Haïdar Safa,et al.  A Policy-Based Trust-Aware Adaptive Monitoring Scheme to enhance WiMax QoS , 2011, Comput. Networks.

[3]  Darcy Poulin.  The challenges of WiMax design , 2006 .

[4]  Jeffrey G. Andrews,et al.  Fundamentals of WiMAX: Understanding Broadband Wireless Networking (Prentice Hall Communications Engineering and Emerging Technologies Series) , 2007 .

[5]  Ajay K. Sharma,et al.  On Performance Evaluation of Different QoS Mechanisms and AMC scheme for an IEEE 802.16 based WiMAX Network , 2010 .

[6]  Georgios B. Giannakis,et al.  Error probability minimizing pilots for OFDM with M-PSK modulation over Rayleigh-fading channels , 2004, IEEE Transactions on Vehicular Technology.

[7]  P. Engelstad,et al.  Fixed WiMAX Field Trial Measurements and Analyses , 2007, 2007 16th IST Mobile and Wireless Communications Summit.

[8]  Timo Hämäläinen,et al.  Ensuring the QoS requirements in 802.16 scheduling , 2006, MSWiM '06.

[9]  M. S. Alam,et al.  Performance evaluation of throughput in optical burst switching , 2011, Int. J. Commun. Syst..

[10]  Upena D. Dalal,et al.  A Survey of Mobile WiMAX IEEE 802.16m Standard , 2010, ArXiv.

[11]  Jiann-Liang Chen,et al.  Cross-layer and cognitive QoS management system for next-generation networking , 2011, Int. J. Commun. Syst..

[12]  Taesoo Kwon,et al.  Extended-rtPS Algorithm for VoIP Services in IEEE 802.16 systems , 2006, 2006 IEEE International Conference on Communications.