CAPWAP Status and Design Considerations for Seamless Roaming Support

Authors: M. Balfaqih, S. Haseeb, M. H. Mazlan, S. N. Hasnan, O. Mahmoud, A. Hashim

Abstract:

Wireless LAN technologies have picked up momentum in the recent years due to their ease of deployment, cost and availability. The era of wireless LAN has also given rise to unique applications like VOIP, IPTV and unified messaging. However, these real-time applications are very sensitive to network and handoff latencies. To successfully support these applications, seamless roaming during the movement of mobile station has become crucial. Nowadays, centralized architecture models support roaming in WLANs. They have the ability to manage, control and troubleshoot large scale WLAN deployments. This model is managed by Control and Provision of Wireless Access Point protocol (CAPWAP). This paper covers the CAPWAP architectural solution along with its proposals that have emerged. Based on the literature survey conducted in this paper, we found that the proposed algorithms to reduce roaming latency in CAPWAP architecture do not support seamless roaming. Additionally, they are not sufficient during the initial period of the network. This paper also suggests important design consideration for mobility support in future centralized IEEE 802.11 networks.

Keywords: 802.11, centralized Architecture, CAPWAP, Roaming.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1082698

References:

[1] B. O-Hara al, P. Calhoun and PJ. Kempf, RFC 3990,"Configuration and Provisioning for Wireless Access Points (CAPWAP), Problem Statement", IETF, February 2005.
[2] W. A. Arunesh Mishra and Minho Shin, "An empirical analysis of the ieee 802.11 mac layer handoff process," ACM SIGCOMM Computer Communication Review, vol. 33, no. 2, pp. 93-102, April 2003.
[3] M. Shin, A. Mishra and W. A. Arbaugh, "Improving the latency of 802.11 Hand-offs using Neighbor Graph," In Proceedings of the 2nd international conference on Mobile systems, applications, and services, pp. 70-83. ACM, New York, USA, 2004.
[4] L. Ravindranath, F. Prashanth, L. Prasath, P. Durairaj and A. Siromoney: "Improving the Latency of 802.11 Handoffs using Sentinel based Architecture," In Proceedings of HiPC 2005 (Posters), Goa, India, December 2005.
[5] R. Khan, S. Aissa and C. Despins, "MAC layer handoff algorithm for IEEE 802.11 wireless networks," Computers and Communications, 2009. ISCC 2009. IEEE Symposium on Advanced Communication Technology, vol., no., pp.687-692, 5-8 July 2009
[6] C. Lee, S. Seo and J. Song, "An Indoor Tracking-based Handoff Mechanism for VoIP Applications in IEEE 802.11 WLANs," Information and Automation for Sustainability, 2008. ICIAFS 2008. 4th International Conference on , vol., no., pp.324-329, 12-14 Dec. 2008
[7] V. M. Chintala and Qing-An Zeng, "Novel MAC Layer Handoff Schemes for IEEE 802.11 Wireless LANs," Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE, vol., no., pp.4435-4440, 11-15 March 2007.
[8] K. Kwon and C. Lee, "A fast handoff algorithm using intelligent channel scan for IEEE 802.11 WLANs," Advanced Communication Technology, 2004. The 6th International Conference on Advanced Communication Technology, vol.1, no., pp. 46- 50, 2004.
[9] H. Velayos and G. Karlsson, "Techniques to reduce the IEEE 802.11b handoff time," Communications, 2004 IEEE International Conference on Advanced Communication Technology, vol.7, no., pp. 3844- 3848 Vol.7, 20-24 June 2004.
[10] K. Ramachandran, S. Rangarajan and J.C. Lin, "Make-Before-Break MAC Layer Handoff in 802.11 Wireless Networks," Communications, 2006. ICC '06. IEEE International Conference on, vol.10, no., pp.4818- 4823, June 2006.
[11] Q. Hong-yan, C. Bing and Q. Xiao-lin, "A Dual-Soft-Handoff Scheme for Fast Seamless Roaming in WLAN," Networks Security Wireless Communications and Trusted Computing (NSWCTC), 2010 Second International Conference on , vol.2, no., pp.97-100, 24-25 April 2010
[12] V. Brik, A. Mishra and S. Banerjee, "Eliminating handoff latencies in 802.11 WLANs using Multiple Radios: Applications, Experience, and Evaluation," In proceeding IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement, USA, 2005.
[13] A. Mishra, M. Shin and W.A. Arbaush, "Context caching using neighbor graphs for fast handoffs in a wireless network," INFOCOM 2004. Twenty-third AnnualJoint Conference of the IEEE Computer and Communications Societies , vol.1, no., pp. 4 vol. (xxxv+2866), 7-11 March 2004.
[14] A. Mishra, M. Shin and N.L. Petroni, Arbaugh, "Proactive key distribution using neighbor graphs," Wireless Communications, IEEE , vol.11, no.1, pp. 26- 36, Feb 2004.
[15] S. Pack and Y. Choi, "Fast handoff scheme based on mobility prediction in public wireless LAN systems," Communications, IEE Proceedings- , vol.151, no.5, pp. 489- 495, 24 Oct. 2004.
[16] B. Sarikaya and Xiao Zheng, "CAPWAP Handover Protocol," Communications, 2006. ICC '06. IEEE International Conference on , vol.4, no., pp.1933-1938, June 2006.
[17] M. A. Amin, K. Abu Bakar, A. Abdullah and R. H. Khokhar, "Handover Latency Measurement using Variant of Capwap Protocol" , Network Protocols and Algorithms ISSN 1943-3581 , Vol. 3, No. 2, 2011.
[18] L. Yang, P. Zerfos and E. Sadot, RFC4118, "Architecture Taxonomy for Control and Provisioning of Wireless Access Points (CAPWAP)", IETF, June 2005.
[19] P. Calhoun, M. Montemurro and D. Stanley,RFC 5415, "Control And Provisioning of Wireless Access Points (CAPWAP) Protocol Specification", IETF, March 2009.
[20] M. Bernaschi, F. Cacace, G. Iannello, M. Vellucci and L. Vollero, "OpenCAPWAP: an open-source CAPWAP implementation for management and QoS support," Telecommunication Networking Workshop on QoS in Multiservice IP Networks, 2008. IT-NEWS 2008. 4th International, vol., no., pp.72-77, 13-15 Feb. 2008.
[21] M. Bernaschi, F. Cacace, G. Iannello, M. Vellucci and L. Vollero, "OpenCAPWAP: An open source CAPWAP implementation for the management and configuration of WiFi hot-spots", presented at Computer Networks, 2009, pp.217-230.
[22] Y. Bejeranoa and S.-J. Han, "Cell breathing techniques for balancing the access point load in wireless LANs," in: Proceedings of Infocom, 2006.
[23] F. Cacace, G. Iannello, M. Vellucci and L. Vollero, "A reactive approach to QoS Provisioning in IEEE 802.11e WLANs", in: Proceedings of 4th EURO-NGI Conference on Next Generation Internet Networks, Krakow, Poland, April 2008.
[24] M. Bernaschi, F. Cacace, A. Davoli, D. Guerri, M. Latini and L. Vollero, "A CAPWAP-based solution for frequency planning in large scale networks of WiFi Hot-Spots", Computer Communications, Volume 34, Issue 11, 15 July 2011, Pages 1283-1293.
[25] A. Levanti, F. Giordano and I. Tinnirello, "A CAPWAP Architecture for Automatic Frequency Planning in WLAN," Computers and Communications, 2007. ISCC 2007. 12th IEEE Symposium on , vol., no., pp.MW-51-MW-56, 1-4 July 2007.
[26] A. Levanti, F. Giordano and I. Tinnirello, "A CAPWAP-Compliant Solution for Radio Resource Management in Large-Scale 802.11 WLAN," Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE, vol., no., pp.3645-3650, 26-30 Nov. 2007.
[27] A. Mishra, S. Banerjee, and W. Arbaugh, "Using Partially Overlapped Channels in Wireless Meshes", in IEEE Infocom, 2005.
[28] P. Calhoun, M. Montemurro and D. Stanley, RFC 5416 , "Control and Provisioning of Wireless Access Points (CAPWAP) Protocol Binding for IEEE 802.11" , 2009.