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1 User-centric Communication Technology for Guaranteed QoE in Heterogeneous Networks This paper proposes a framework for the user-cetric communication. First, we introduce the concept of usercentric communication and present the network structure and the protocol stacks of the end user device. We design a new protocol stack called Service Continuity Management (SCM). SCM has four functional blocks which is located between the application layer and the transport layer. SCM monitors the service Quality of Experience (QoE) and makes the multiple sessions for a one service using multiple radio adaptors in order to maintain QoE requirements. According to the performance analysis, the user-centric communication shorten the handover delay in heterogeneous networks and we can use achieve the cost and power effective wireless communication using the user-centric communication. Keywords: User-centric communication, Multi-homing I

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10 T LTE HO (L control pk size L data pk size )C LTE W LTE T timeout T scan T Link setup T session setup (L control pk size L data pk size )C WiFi W WiFi T PMIP HO (L control pk size L data pk size )(β C LTE (1β)C WiFi ) β : Portion of LTE usage β W LTE (1β )W WiFi T service path change (L control pk size (T service move D service rate ))C LTE (L data pk size (T service move D service rate ))C WiFi, T service move T scan T Link setup T session change αw LTE (1α)(W WiFi W LTE Sleep ), α: Portion of control packets W LTE,W LTEsleep [13] W WiFi [14] C LTE [15] C WiFi T LTE HO [16] T PMIP HO [17] T timeout T scan [20] T Link setup [18],[21] T session setup [18],[22] T service path change [18],[19],[22] T session change [10][13][14]

11 (T timeout ) (T scan ) (T Link setup ) (T session setup ) (T PMIP HO ) C LTE, C WiFi

12 IV [1] Shu-ping Yeh; Talwar, S.; Seong-choon Lee; Heechang Kim;, "WiMAX femtocells: a perspective on network architecture, capacity, and coverage," Communications Magazine, IEEE, Vol. 46, No. 10, pp.58-65, Oct [2] Gustafsson, E.; Jonsson, A.;, "Always best connected," Wireless Communications, IEEE, Vol. 10, No.1, Feb., 2003, pp [3] Nguyen-Vuong, Q.-T.; Agoulmine, N.; Ghamri- Doudane, Y.;, "Terminal-Controlled Mobility Management in Heterogeneous Wireless Networks," Communications Magazine, IEEE, Vol.45, No. 4, Apr. 2007, pp [4] Quoc-Thinh Nguyen-Vuong, Nazim Agoulmine, Yacine Ghamri-Doudane, A user-centric and contextaware solution to interface management and access network selection in heterogeneous wireless environments, Computer Networks, Vol. 52, Issue 18, 22 Dec. 2008, pp [5] W. Zhang, ''Handover decision using fuzzy MADM in heterogeneous networks,'' Proc. IEEE Wireless Communications and Networking Conf., (WCNC 2004), Mar. 2004, Vol. 2, pp [6] D. Charilas, O. Markaki, D. Nikitopoulos, and M. Theologou, ''Packet-switched network selection with the highest QoS in 4G networks,'' Elsevier Comput. Networks, Vol. 52, No. 1, Jan. 2008, pp [7] D. E. Charilas, O. I. Markaki, J. Psarras, and Ph. Constantinou, ''Application of fuzzy AHP and ELECTRE to network selection,'' in Proc. 1st Int. Conf. Mobile Lightweight Wireless Systems (Mobilight 2009), Athens, Greece, May 2009, pp [8] Y. Yu, B. Yong, and C. Lan, ''Utility-dependent network selection using MADM in heterogeneous wireless networks,'' in Proc. 18th Annu. IEEE Int. Symp. Personal, Indoor and Mobile Radio Communications (PIMRC'07), 2007, pp [9] P. N. Tran and N. Boukhatem, ''Comparison of MADM decision algorithms for interface selection in heterogeneous wireless networks,'' in Proc. 16th Int. Conf. Software, Telecommunications and Computer Networks, 2008 (SoftCOM'08), pp [10] IEEE Std e TM -2005, ''IEEE Standard for Local and Metropolitan Area Networks, Part 16: Air Interface for Fixed Broadband Wireless Access Systems, Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands and Corrigendum 1,'' Feb [11] 3GPP TR , ''Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2'' v9.6.0, Dec [12] 3GPP TR , ''Technical Specification Group Services and System Aspects; Architecture enhancements for non-3gpp accesses,'' v11.2.0, Mar [13] Deruyck, M., Vereecken, W., Tanghe, E., Joseph, W., Pickavet, M., Martens, L., Demeester, P., "Comparison of power consumption of mobile WiMAX, HSPA and LTE access networks," Telecommunications Internet and Media Techno Economics (CTTE), th Conference on, Vol., No., Jun. 2010, pp.1-7, 7-9. [14] Daniel Halperin, Ben Greenstein, Anmol Sheth and David Wetheral, "Demystifying n Power Consumption," ln HotPower, 2010 [15] [16], "," in Proc.,,

2011, pp.367-372, 26-28. [18] Sangheon Pack, Hojin Lee, "Call Setup Latency Analysis in SIP-Based Voice over WLANs," Communications Letters, IEEE, Vol. 12, No.2, Feb. 2008, pp.103-105.

13 [17] Gohar, M., Sang Il Choi, Seok Joo Koh, "Fast handover using multicast handover agents in PMIPv6-based wireless networks," Information Networking (ICOIN), 2011 International Conference on, Vol., No., Jan. 2011, pp , [18] Sangheon Pack, Hojin Lee, "Call Setup Latency Analysis in SIP-Based Voice over WLANs," Communications Letters, IEEE, Vol. 12, No.2, Feb. 2008, pp [19] Muslim Elkotob, Karl Andersson, ''Analysis and measurement of session setup delay and jitter in VoWLAN using composite metrics,'' Proceedings of the 7th International Conference on Mobile and Ubiquitous Multimedia, [20] IEEE Standard for Information technology- Telecommunications and nformation exchange between systems - Local and metropolitan area networks- Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, [21] Kam Yong Kim; Kyeong Gon Ham; Kee Seong Cho; Seong-Gon Choi;, "Seamless handover scheme based on SIP in Wireless LAN," Advanced Communication Technology (ICACT), th International Conference on, Vol., No., Feb. 2011, pp , [22]

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°í¼®ÁÖ Ãâ·Â Performance Optimization of SCTP in Wireless Internet Environments The existing works on Stream Control Transmission Protocol (SCTP) was focused on the fixed network environment. However, the number of