Connection Robustness for Wireless Moving Networks Using Transport Layer Multi-homing

Given any form of mobility management through wireless communication, one useful enhancement is improving the reliability and robustness of transport-layer connections in a heterogeneous mobile environment. This is particularly true in the case of mobile networks with multiple vertical handovers. In this thesis, issues and challenges in mobility management for mobile terminals in such a scenario are addressed, and a number of techniques to facilitate and improve efficiency and the QoS for such a handover are proposed and investigated. These are initially considered in an end-to-end context and all protocols and changes happened in the middleware of the connection where the network is involved with handover issues and end user transparency is satisfied. This thesis begins by investigating mobility management solutions particularly the transport layer models, also making significant observation pertinent to multi-homing for moving networks in general. A new scheme for transport layer tunnelling based on SCTP is proposed. Consequently a novel protocol to handle seamless network mobility in heterogeneous mobile networks, named nSCTP, is proposed. Efficiency of this protocol in relation to QoS for handover parameters in an end-to-end connection while wired and wireless networks are available is considered. Analytically and experimentally it has been proved that this new scheme can significantly increase the throughput, particularly when the mobile networks roam frequently. The detailed plan for the future improvements and expansion is also provided

Quality-Oriented Mobility Management for Multimedia Content Delivery to Mobile Users

The heterogeneous wireless networking environment determined by the latest developments in wireless access technologies promises a high level of communication resources for mobile computational devices. Although the communication resources provided, especially referring to bandwidth, enable multimedia streaming to mobile users, maintaining a high user perceived quality is still a challenging task. The main factors which affect quality in multimedia streaming over wireless networks are mainly the error-prone nature of the wireless channels and the user mobility. These factors determine a high level of dynamics of wireless communication resources, namely variations in throughput and packet loss as well as network availability and delays in delivering the data packets. Under these conditions maintaining a high level of quality, as perceived by the user, requires a quality oriented mobility management scheme. Consequently we propose the Smooth Adaptive Soft-Handover Algorithm, a novel quality oriented handover management scheme which unlike other similar solutions, smoothly transfer the data traffic from one network to another using multiple simultaneous connections. To estimate the capacity of each connection the novel Quality of Multimedia Streaming (QMS) metric is proposed. The QMS metric aims at offering maximum flexibility and efficiency allowing the applications to fine tune the behavior of the handover algorithm. The current simulation-based performance evaluation clearly shows the better performance of the proposed Smooth Adaptive Soft-Handover Algorithm as compared with other handover solutions. The evaluation was performed in various scenarios including multiple mobile hosts performing handover simultaneously, wireless networks with variable overlapping areas, and various network congestion levels

A Unified Mobility Management Architecture for Interworked Heterogeneous Mobile Networks

The buzzword of this decade has been convergence: the convergence of telecommunications, Internet, entertainment, and information technologies for the seamless provisioning of multimedia services across different network types. Thus the future Next Generation Mobile Network (NGMN) can be envisioned as a group of co-existing heterogeneous mobile data networking technologies sharing a common Internet Protocol (IP) based backbone. In such all-IP based heterogeneous networking environments, ongoing sessions from roaming users are subjected to frequent vertical handoffs across network boundaries. Therefore, ensuring uninterrupted service continuity during session handoffs requires successful mobility and session management mechanisms to be implemented in these participating access networks. Therefore, it is essential for a common interworking framework to be in place for ensuring seamless service continuity over dissimilar networks to enable a potential user to freely roam from one network to another. For the best of our knowledge, the need for a suitable unified mobility and session management framework for the NGMN has not been successfully addressed as yet. This can be seen as the primary motivation of this research. Therefore, the key objectives of this thesis can be stated as: To propose a mobility-aware novel architecture for interworking between heterogeneous mobile data networks To propose a framework for facilitating unified real-time session management (inclusive of session establishment and seamless session handoff) across these different networks. In order to achieve the above goals, an interworking architecture is designed by incorporating the IP Multimedia Subsystem (IMS) as the coupling mediator between dissipate mobile data networking technologies. Subsequently, two different mobility management frameworks are proposed and implemented over the initial interworking architectural design. The first mobility management framework is fully handled by the IMS at the Application Layer. This framework is primarily dependant on the IMS’s default session management protocol, which is the Session Initiation Protocol (SIP). The second framework is a combined method based on SIP and the Mobile IP (MIP) protocols, which is essentially operated at the Network Layer. An analytical model is derived for evaluating the proposed scheme for analyzing the network Quality of Service (QoS) metrics and measures involved in session mobility management for the proposed mobility management frameworks. More precisely, these analyzed QoS metrics include vertical handoff delay, transient packet loss, jitter, and signaling overhead/cost. The results of the QoS analysis indicates that a MIP-SIP based mobility management framework performs better than its predecessor, the Pure-SIP based mobility management method. Also, the analysis results indicate that the QoS performances for the investigated parameters are within acceptable levels for real-time VoIP conversations. An OPNET based simulation platform is also used for modeling the proposed mobility management frameworks. All simulated scenarios prove to be capable of performing successful VoIP session handoffs between dissimilar networks whilst maintaining acceptable QoS levels. Lastly, based on the findings, the contributions made by this thesis can be summarized as: The development of a novel framework for interworked heterogeneous mobile data networks in a NGMN environment. The final design conveniently enables 3G cellular technologies (such as the Universal Mobile Telecommunications Systems (UMTS) or Code Division Multiple Access 2000 (CDMA2000) type systems), Wireless Local Area Networking (WLAN) technologies, and Wireless Metropolitan Area Networking (WMAN) technologies (e.g., Broadband Wireless Access (BWA) systems such as WiMAX) to interwork under a common signaling platform. The introduction of a novel unified/centralized mobility and session management platform by exploiting the IMS as a universal coupling mediator for real-time session negotiation and management. This enables a roaming user to seamlessly handoff sessions between different heterogeneous networks. As secondary outcomes of this thesis, an analytical framework and an OPNET simulation framework are developed for analyzing vertical handoff performance. This OPNET simulation platform is suitable for commercial use

Connection robustness for wireless moving networks using transport layer multi-homing

Given any form of mobility management through wireless communication, one useful enhancement is improving the reliability and robustness of transport-layer connections in a heterogeneous mobile environment. This is particularly true in the case of mobile networks with multiple vertical handovers. In this thesis, issues and challenges in mobility management for mobile terminals in such a scenario are addressed, and a number of techniques to facilitate and improve efficiency and the QoS for such a handover are proposed and investigated. These are initially considered in an end-to-end context and all protocols and changes happened in the middleware of the connection where the network is involved with handover issues and end user transparency is satisfied. This thesis begins by investigating mobility management solutions particularly the transport layer models, also making significant observation pertinent to multi-homing for moving networks in general. A new scheme for transport layer tunnelling based on SCTP is proposed. Consequently a novel protocol to handle seamless network mobility in heterogeneous mobile networks, named nSCTP, is proposed. Efficiency of this protocol in relation to QoS for handover parameters in an end-to-end connection while wired and wireless networks are available is considered. Analytically and experimentally it has been proved that this new scheme can significantly increase the throughput, particularly when the mobile networks roam frequently. The detailed plan for the future improvements and expansion is also provided.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Integrated Support for Handoff Management and Context-Awareness in Heterogeneous Wireless Networks

The overwhelming success of mobile devices and wireless communications is stressing the need for the development of mobility-aware services. Device mobility requires services adapting their behavior to sudden context changes and being aware of handoffs, which introduce unpredictable delays and intermittent discontinuities. Heterogeneity of wireless technologies (Wi-Fi, Bluetooth, 3G) complicates the situation, since a different treatment of context-awareness and handoffs is required for each solution. This paper presents a middleware architecture designed to ease mobility-aware service development. The architecture hides technology-specific mechanisms and offers a set of facilities for context awareness and handoff management. The architecture prototype works with Bluetooth and Wi-Fi, which today represent two of the most widespread wireless technologies. In addition, the paper discusses motivations and design details in the challenging context of mobile multimedia streaming applications

An Intelligent Vertical Handover Scheme for Audio and Video Streaming in Heterogeneous Vehicular Networks

In heterogeneous vehicular networks, the most challenging issue is obtaining an efficient vertical handover during the vehicle roaming process. Efficient network selection process can achieve satisfactory Quality of Service for ongoing applications. In this paper, we propose an Intelligent Network Selection (INS) scheme based on maximization scoring function to efficiently rank available wireless network candidates. Three input parameters were utilized to develop a maximization scoring function that collected data from each network candidate during the selection process. These parameters are: Faded Signal-to-Noise Ratio, Residual Channel Capacity, and Connection Life Time. The results show that the proposed INS scheme is more efficient at decreasing handover delays, End-to-End delays for VoIP and Video applications, packet loss ratios as well as increasing the efficiency of network selection processes in comparison with the state of the arts.Sadiq, AS.; Abu Bakar, K.; Ghafoor, KZ.; Lloret, J.; Khokhar, R. (2013). An Intelligent Vertical Handover Scheme for Audio and Video Streaming in Heterogeneous Vehicular Networks. Mobile Networks and Applications. 18(6):879-895. doi:10.1007/s11036-013-0465-8S879895186Chen YS, Cheng CH, Hsu CS, Chiu GM (2009) Network mobility protocol for vehicular ad hoc networks. In: Wireless communications and networking conference, IEEE, pp 1–6Ghafoor KZ, Abu Bakar K, Lee K, AL-Hashimi H (2010) A novel delay-and reliability-aware inter-vehicle routing protocol. Netw Protoc Algorithm 2(2):66–88Ghafoor KZ, Abu Bakar K, Lloret J, Khokhar RH, Lee KC (2013) Intelligent beaconless geographical forwarding for urban vehicular environments. Wirel netw 19(3):345–362Prakash A, Tripathi S, Verma R, Tyagi N, Tripathi R, Naik K (2011) Vehicle assisted cross-layer handover scheme in nemo-based vanets (vanemo). Int J Internet Protoc Technol 6(1):83–95Lee C-W, Chen MC, Sun YS (2013) Protocol and architecture supports for network mobility with qos-handover for high-velocity vehicles. Wirel Netw 19(5):811–830Pereira P, Casaca A, Rodrigues JJPC, Soares VNGJ, Triay Joan, Cervelló-Pastor C (2011) From delay-tolerant networks to vehicular delay-tolerant networks. IEEE Commun Surv Tutor 1(4):1166–1182Lloret J, Canovas A, Catalá A, Garcia M (2013) Group-based protocol and mobility model for vanets to offer internet access. J Netw Comput Appl 36(3):10271038Ghafoor KZ, Lloret J, Abu Bakar K, Sadiq AS, Mussa SAB (2013) Beaconing approaches in vehicular ad hoc networks: A survey. Wirel Pers Commun 1–28. doi: 10.1007/s11277-013-1222-9Wang L, Kuo G (2011) Mathematical modeling for network selection in heterogeneous wireless networks?a tutorial. IEEE Commun Surv Tutor 15(1):271–292Nguyen-Vuong QT, Ghamri-Doudane Y, Agoulmine N (2008) On utility models for access network selection in wireless heterogeneous networks. In: Network operations and management symposium. Salvador, Bahia, pp 144–151Canovas A, Bri D, Sendra S, Lloret J (2012) Vertical WLAN handover algorithm and protocol to improve the IPTV QoS of the end user. ON, Ottawa, pp 1901–1905Varma VK, Ramesh S, Wong KD, Barton M, Hayward G, Friedhoffer JA (2003) Mobility management in integrated UMTS/WLAN networks. In: International conference on communications. IEEE, USA, pp 1048–1053Mohanty S (2006) A new architecture for 3G and WLAN integration and inter-system handover management. Wirel Netw 12(6):733–745Rivera-Lara EJ, Herrerías-Hernández R, Pérez-Díaz JA, García-Hernández CF (2008) Analysis of the relationship between QoS and snr for an 802.11 g wlan. In: International conference on communication theory, reliability, and quality of service. IEEE, Bucharest, pp 103–107Rappaport TS (2002) Wireless communications principles and practice, 2nd edn. Prentice Hall PTR, Upper Saddle RiverCarpenter T (2007) CWNA certified wireless network administrator official study guide (Exam PW0-100). McGraw-Hill Osborne Media, New YorkEberspacher J, Eberspächer J, Bettstetter C, Vögel HJ, Hartmann C, Vgel HJ, et al (2009) GSM-architecture, protocols and services. Wiley, New YorkWLAN-MAC (2007) Wireless lan medium access control (MAC) and physical layer specifications. IEEE Comput Soc, pp 1–1183. http://standards.ieee.org/getieee802/802.11.html ,Kappler C (2009) UMTS networks and beyond. Wiley, New YorkEgoh K, De S (2006) A multi-criteria receiver-side relay election approach in wireless ad hoc networks. In: Military communications conference. IEEE, Washington, DC, pp 1–7Bucciol P, Ridolfo F, De Martin JC (2008) Multicast voice transmission over vehicular ad hoc networks: issues and challenges. In: Seventh international conference on networking. IEEE, Cancun, pp 746–751Thonet G, Allard-Jacquin P, Colle P (2008) Zigbee–wifi coexistence, Schneider electric white paperRibadeneira AF (2007) An analysis of the mos under conditions of delay, jitter and packet loss and an analysis of the impact of introducing piggybacking and Reed Solomon fec for VoIP. Computer science theses, pp 44Karapantazis S, Pavlidou FN (2009) Voip: A comprehensive survey on a promising technology. Comput Netw 53(12):2050–2090Ortiz C, Frigon JF, Sanso B, Girard A (2008) Effective bandwidth evaluation for voip applications in ieee 802.11 networks. In: Wireless communications and mobile computing conference. IEEE, Crete Island, pp 926–931International Telecommunication Union (1996) Telecommunication Standardization Sector. Methods for subjective determination of transmission quality, international telecommunication unionLi D, Pan J (2008) Evaluating MPEG-4/AVC video streaming over ieee 802.11 wireless distribution system. In: Wireless communications and networking conference. WCNC 2008 IEEE, IEEE, pp 2147–2152Yan X, Mani N, Cekercioglu YA (2008) A traveling distance prediction based method to minimize unnecessary handovers from cellular networks to WLANS. Commun Lett IEEE 12(1):14–16Lo SC, Lee G, Chen WT, Liu JC (2004) Architecture for mobility and QoS support in all-ip wireless networks. IEEE J Sel Areas Commun 22(4):691–705Pries R, Staehle D, Tran-Gia P, Gutbrod T (2008) A seamless vertical handover approach. In: Cerd?-Alabern L (ed) Wireless systems and mobility in next generation internet, vol 5122. Springer, Berlin Heidelberg, pp 167–184Munasinghe KS, Jamalipour A (2010) An analytical evaluation of mobility management in integrated WLAN-UMTS networks. Comput Electr Eng 36(4):735–75