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IEEE 802.11 has become very popular wireless technology to offer high speed Internet access at public places called the ‘Hot-Spots’. This has enabled users to access multimedia and other real time applications using wireless local area networks (WLAN). In IEEE 802.11 WLAN technology, associations between a mobile station and an access point (AP) is controlled by the mobile station, allowing the station to select an AP with the strongest signal in terms of either ‘Received Signal Strength Identifier’ or ‘Signal to Interference and Noise Ratio’. In real time scenarios, the traffic patterns of mobile users are dynamic in nature. This leads to a situation where the traffic loads on the APs are unevenly distributed in the WLAN. Such imbalance in traffic load causes severe degradation in performance of the applications running on the mobile stations associated with the overloaded APs. In this paper, we propose a scheme which dynamically improves the performance of the overloaded APs by handing off some of its associated stations to nearby APs. This handoff decision is taken by an AP in assistance with the mobile stations. The effectiveness of the load distribution through dynamic hand-over in a WLAN is analyzed through theoretical analysis. Simulation results show the overall improvements in terms of delay, throughput and number of stations that an AP can support. The performance improvement in the proposed scheme is also justified through the results obtained from a IEEE 802.11 WLAN testbed.
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Balachandran, A., Bahl, P., & Voelker, G. M. (2002). Hot-spot congestion relief in public-area wireless networks. In Proceedings of the fourth IEEE workshop on mobile computing systems and applications (pp. 70–80).
Balachandran, A., Voelker, G. M., & Bahl, P. (2005). Wireless hotspots: Current challenges and future directions. Mobile Networks and Applications, 10(3), 265–274. CrossRef
Balachandran, A., Voelker, G. M., Bahl, P., & Rangan, P. V. (2002). Characterizing user behavior and network performance in a public wireless LAN. In Marina Del Rey (pp. 195–205).
Balazinska, M., & Castro, P. (2003). Characterizing mobility and network usage in a corporate wireless local-area network. In Proceedings of the 1st international conference on mobile systems, applications and services (pp. 303–316).
Bejerano, Y., & Han, S. J. (2009). Cell breathing techniques for load balancing in wireless LANs. IEEE Transactions on Mobile Computing, 8(6), 735–749. CrossRef
Bejerano, Y., Han, S. J., & Li, L. E. (2004). Fairness and load balancing in wireless LANs using association control. In Proceedings of the 10th annual international conference on mobile computing and networking (pp. 315–329).
Costa, R., Portugal, P., Moraes, R., & Vasques, F. (2012). An admission control mechanism to handle real-time traffic in IEEE 802.11 networks in open communication environments. In Proceedings of the 9th IEEE international workshop on factory communication systems (pp. 63–66).
Daher, R., & Tavangarian, D. (2006). Resource reservation and admission control in IEEE 802.11 WLANs. In Proceedings of the 3rd international conference on quality of service in heterogeneous wired/wireless networks.
Du, L., Jeong, M. R., Yamada, A., Bai, Y., & Chen, L. (2008). QoS aware access point selection for pre-load-balancing in multi-BSSs WLAN. In Proceedings of the IEEE wireless communications and networking conference (pp. 1634–1638).
Engineering Statistics Handbook, Single Exponential Smoothing. http://www.itl.nist.gov/div898/handbook/pmc/section4/pmc431.htm.
Gong, H., & Kim, J. (2008). Dynamic load balancing through association control of mobile users in WiFi networks. IEEE Transactions on Consumer Electronics, 54(2), 342–348. CrossRef
Guo, F., & Chiueh, T. (2005) Scalable and robust WLAN connectivity using access point array. In Proceedings of the international conference on dependable systems and networks (pp. 288–297).
Housley, R., & Aboba, B., et al. (2007). Guidance for authentication, authorization, and accounting (AAA) key management. Technical report, BCP 132, RFC 4962.
Hulsebosch, R. J., Eertink, E. H., Prasad, A., Wang, H., Schoo, P., & Bargh, M. S. (2004). Fast authentication methods for handoffs between IEEE 802.11 wireless LANs. In Proceedings of the 2nd ACM international workshop on Wireless mobile applications and services on WLAN hotspots.
IEEE: IEEE Std 802.11-1999, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications (Édition 1999). Status: Adopted by the ISO/IEC and redesignated as ISO/IEC 8802-11:1999(E).
Lee, Y., Kim, K., & Choi, Y. (2002). Optimization of AP placement and channel assignment in wireless LANs. In Proceedings of the 27th annual IEEE conference on local computer networks (pp. 831–836).
Mishra, A., Shin, M., & Arbaugh, W. (2003). An empirical analysis of the IEEE 802.11 MAC layer handoff process. ACM SIGCOMM. Computer Communication Review, 33(2), 93–102. CrossRef
Mishra, A., Shin, M., & Arbaugh, W. A. (2004). Context caching using neighbor graphs for fast handoffs in a wireless network. In The IEEE international conference on computer communications (IEEE INFOCOM 2004).
Nunes, B., & Obraczka, K. (2012). Modeling spatial node density in waypoint mobility. In Proceedings of the IEEE 9th international conference on mobile adhoc and sensor systems (pp. 453–457).
Ong, E. H., & Khan, J. (2008). An integrated load balancing scheme for future wireless networks. In Proceedings of the IEEE GLOBECOM workshops.
Park, B. H., Kwon, Y. M., Bae, S. J., & Chung, M. Y. (2013). Implementation of connection management scheme of mobile stations in IEEE 802.11 WLAN APs considering transmission power control. In Proceedings of the IEEE TENCON spring conference (pp. 515–519).
Qualnet Forum. http://www.scalable-networks.com
RaLink RT3352 series IEEE 802.11n routers-on-chip. http://www.mediatek.com/_en/01_products/04_pro.php?sn=1006
Sarma, A., Gupta, R. K., & Nandi, S. (2009). A zone based interleaved scanning technique for fast handoff in IEEE 802.11 wireless networks. In Proceedings of the 10th international symposium on pervasive systems, algorithms, and networks (pp. 232–237).
Sarma, A., Joshi, S., & Nandi, S. (2011). Context aware mobile initiated handoff for performance improvement in IEEE 802.11 networks. In Advances in networks and communications (pp. 243–253).
Sawma, G., Aib, I., Ben-El-Kezadri, R., & Pujolle, G. (2008). ALBA: An autonomic load balancing algorithm for IEEE 802.11 wireless networks. In IEEE/IFIP network operations and management symposium (NOMS) (pp. 891–894).
Sheu, S. T., & Wu, C. C. (1999). Dynamic load balance algorithm (DLBA) for IEEE 802.11 wireless LAN. Journal of Science and Engineering, 2(1), 45–52. MathSciNet
Sommers, J., & Barford, P. (2012). Cell vs. WiFi: On the performance of metro area mobile connections. In Proceedings of the 2012 ACM conference on internet measurement conference (pp. 301–314).
Wei, W., Jaiswal, S., Kurose, J., Towsley, D., Suh, K., & Wang, B. (2012). Identifying 802.11 traffic from passive measurements using iterative bayesian inference. IEEE/ACM Transactions on Networking, 20(2), 325–338. CrossRef
Zhai, H., Chen, X., Member, S., Fang, Y., & Member, S. (2005). How well can the IEEE 802.11 wireless LAN support quality of service? IEEE Transaction on Wireless Communications, 4, 3084–3094. CrossRef
Zheng, L., & Hoang, D. B. (2009). Overlapping impacts and resource coordination for high-density wireless communication. In Proceedings of the international conference on computing and communication technologies (pp. 1–7).
- Context Aware Inter-BSS Handoff in IEEE 802.11 Networks: Efficient Resource Utilization and Performance Improvement
- Springer US