Weitere Artikel dieser Ausgabe durch Wischen aufrufen
Wireless connectivity is becoming pervasive in our lives as wireless networks and mobile devices have been undergoing a magnificent evolution. In this context, consumers demand to access to the wireless communication services anytime and anywhere with high performance. IEEE 802.11 wireless local area networks (WLANs) have a direct impact on this widespread use. Nevertheless, as any standard procedure, WLAN also has its own drawbacks. In IEEE 802.11 wireless networks, periodic channel scanning is an essential procedure to discover available access points in the vicinity and to achieve fast handover. However, this procedure leads to unnecessary overhead in wireless networks and also interrupts ongoing communications of stations. In this paper, we propose a smart proactive channel scanning scheme that allows stations to achieve fast handover with minimized communication interruptions. In the proposed scheme, periodic channel scanning is scheduled based on adaptive channel scanning intervals and activated after a frame transmission only if the mobile station is on move or the received signal strength indicator value drops below a pre-specified threshold. The proposed scheme is a client-side software solution that any station can benefit from, without changing the standard in any existing IEEE 802.11 environment. Analytical and simulation results show that the proposed channel scanning scheme reduces the channel scanning overhead dramatically, minimizes communication interruptions and improves the overall throughput of stations.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
IEEE Std. 802.11. (1999). Wireless LAN medium access control (MAC) and physical layer (PHY) specifications.
Shin, M., Mishra, A. & Arbaugh, W. A. (2004). Improving the latency of 802.11 hand-offs using neighbor graphs. In Proceedings of the ACM MobiSys Conference (pp. 6–9). Boston, MA, USA, June 2004.
Chintala, V. M. & Zeng, Q. A. (2007). Novel MAC layer handoff schemes for IEEE 802.11 wireless LANs. In Proceedings of the IEEE WClNC Conference (pp. 11–15). Hong Kong, March 2007.
Doppler, K., Ribeiro, C. B. & Kneckt, J. (2011). On efficient discovery of next generation local area networks. In Proceedings of the IEEE WCNC Conference (pp. 28–31). Cancun, Mexico, March 2011.
IEEE Std. 802.21. (2008). Draft standard for local and metropolitan area networks: Media independent handover service. IEEE 802.21/D11.0, May 2008.
Wu, H., Kun, T., Zhang, Y. & Zhang, Q. (2007). Proactive scan: Fast handoff with smart triggers for 802.11 wireless LAN. In Proceedings of the IEEE INFOCOM Conference (pp. 6–12). Anchorage, Alaska, USA, May 2007.
Saxena, N., & Roy, A. (2011). Novel framework for proactive handover with seamless multimedia over WLANs. IET Communications, 5(9), 1204–1212. CrossRef
Ramani, I., & Savage, S. (2005). SyncScan: Practical fast handoff for 802.11 infrastructure networks. In Proceedings of the IEEE INFOCOM Conference (pp. 13–17). Miami, USA, March 2005.
Ok, J., Morales, P., Darmawan, A., & Morikawa, H. (2007). Using shared beacon channel for fast handoff in IEEE 802.11 wireless networks. In Proceedings of the IEEE VTC-Spring (pp. 22–25). Dublin, Ireland, April 2007.
Brik, V., Mishra, A., & Banerjee, S. (2005). Eliminating handoff latencies in 802.11 WLANs using multiple radios: Applications, experience, and evaluation. In Proceedings of the ACM/USENIX IMC (pp. 19–21). Berkeley, CA, October 2005.
Sunggeun, J., Munhwan, C., Lei, W., & Sunghyun, C. (2011). Fast scanning schemes for IEEE 802.11 WLANs in virtual AP environments. Computer Networks, 55(10), 2520–2533. CrossRef
Ok, J., Morales, P., & Morikawa, H. (2008). Scanning through authentication for IEEE 802.11 WLAN fast handoff. IEICE technical report. Information Networks, 107(483), 47–52.
Purushothaman, I., & Roy, S. (2010). FastScan: A handoff scheme for voice over IEEE 802.11 WLANs. Wireless Networks, 16(7), 2049–2063. CrossRef
Kim, H. S., Park, S. H., Park, C. S., Kim, J. W., & Ko, S. J. (2004). Selective channel scanning for fast handoff in wireless LAN using neighbor graph. In Proceedings of the International Technical Conference on Circuits/Systems, Computers and Communications (pp. 5–8). Miyagi, Japan, July 2004.
Yu, X. G., She, Y. X., Li, B., Lei, L., & Lang, S. (2009). Predictive channel scanning over WLAN. In Proceedings of the Wireless Communications, Networking and Mobile Computing Conference (pp. 24–26). Beijing, China, September 2009.
Zheng, C., Olli, A., Eng, H. O., & Jarkko, K. (2012). Enhanced channel scanning schemes for next generation WLAN system. In Proceedings of the IEEE ICCC Conference (pp. 15–17). Beijing, China, August 2012.
Castignani, G., Montavont, N., & Arcia-Moret, A. (2010). Analysis and evaluation of WiFi scanning strategies. In Proceeding of IV Cibelec (pp. 3–7). Mérida, Venezuela, May 2010.
Jin, T., Changqing, X., Weijia, J. & Dong, X. (2009). D-scan: Enabling fast and smooth handoffs in AP-dense 802.11 wireless networks. In Proceedings of the IEEE INFOCOM Conference (pp. 19–25). Rio de Janeiro, Brazil, April 2009.
Tamir, T. M. H., Hasein, I. S., & Yahya M. O. (2009). Reduction of handoff search phase time in IEEE 802.11 WLAN to fulfill real time Services requirements. In Proceedings of the International Conference on Telecommunications, ICT, Marrakech, Morocco, 25–27 May 2009.
Kwak, D., Suh, J., Kim, S., & Mo, J. (2008). Reducing the channel scanning latency for intermittently connected IEEE 802.11 networks in vehicular environments. In Proceedings of the Vehicular Technology Conference (pp. 11–14) . Singapore: VTC Spring, May 2008.
Zhenxia, Z., Richard, W. P., & Boukerche, A. (2010). A Fast MAC layer handoff protocol for WiFi-based wireless networks. In Proceedings of the IEEE International Workshop on Wireless Local Networks, Denver, Colorado, 11 October 2010.
Kim, I., & Young-Tak, K. (2011). Prediction-based smart channel scanning with minimized service disruption for IEEE 802.11e WLAN. IEEE Transactions on Consumer Electronics, 57(2), 386–394. CrossRef
Xue-gang, Y., Yan-xi, S., Bin, L., Lingyin, L., & Shufen, L. (2009). Predictive channel scanning over WLAN. In Proceedings of the WiCom Conference (pp. 26–29). Beijing, China, September 2009.
Lee, S., Kim, M., Sungwon, K., Lee, K., & Jung, I. (2012). Smart scanning for mobile devices in WLANs. In Proceedings of the IEEE ICC Conference (pp. 10–15). Ottawa, Canada, June 2012.
Sang-Jo, Y., & Golmie, N. (2010). Policy-based scanning with QoS support for seamless handovers in wireless networks. Wireless Communications & Mobile Computing, 10(3), 405–425.
Raghavendra, R., Belding, E. M., Papagiannaki, P., & Almeroth, K. C. (2010). Unwanted link layer traffic in large IEEE 802.11 wireless networks. IEEE Transactions on Mobile Computing, 9(9), 1212–1225. CrossRef
Kim, S. W., Kim, B. S., & Fang, Y. (2010). Network allocation vector (NAV)-based opportunistic prescanning process for WLANs. Journal of Electronics Letters, 46(24), 1630–1632. CrossRef
Tuysuz, M. F., & Mantar, H. A. (2013). Smart channel scanning with minimized communication interruptions over IEEE 802.11 WLANs. In Proceedings of the IEEE PIMRC Conference (pp. 8–11). London, UK, September 2013.
Taniuchi, K., Ohba, Y., & Fajardo, V. (2009). IEEE 802.21: Media independent handover: Features, applicability and realization. IEEE Communications Magazine, 47(1), 112–120. CrossRef
ITU-T Recommendation G.107. (2000). The E-model, a computational model for use in transmission planning.
Shafer, I., & Chang, M., (2010). Movement detection for power-efficient smartphone WLAN Localization. In Proceedings of the ACM conference on Modeling, analysis, and simulation of wireless and mobile systems (pp. 17–21). Bodrum, Turkey, October 2010.
- Minimizing Communication Interruptions Using Smart Proactive Channel Scanning Over IEEE 802.11 WLANs
M. F. Tuysuz
H. A. Mantar
- Springer US