184,132 research outputs found

    Architectural and mobility management designs in internet-based infrastructure wireless mesh networks

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    Wireless mesh networks (WMNs) have recently emerged to be a cost-effective solution to support large-scale wireless Internet access. They have numerous ap- plications, such as broadband Internet access, building automation, and intelligent transportation systems. One research challenge for Internet-based WMNs is to design efficient mobility management techniques for mobile users to achieve seamless roam- ing. Mobility management includes handoff management and location management. The objective of this research is to design new handoff and location management techniques for Internet-based infrastructure WMNs. Handoff management enables a wireless network to maintain active connections as mobile users move into new service areas. Previous solutions on handoff manage- ment in infrastructure WMNs mainly focus on intra-gateway mobility. New handoff issues involved in inter-gateway mobility in WMNs have not been properly addressed. Hence, a new architectural design is proposed to facilitate inter-gateway handoff man- agement in infrastructure WMNs. The proposed architecture is designed to specifi- cally address the special handoff design challenges in Internet-based WMNs. It can facilitate parallel executions of handoffs from multiple layers, in conjunction with a data caching mechanism which guarantees minimum packet loss during handoffs. Based on the proposed architecture, a Quality of Service (QoS) handoff mechanism is also proposed to achieve QoS requirements for both handoff and existing traffic before and after handoffs in the inter-gateway WMN environment. Location management in wireless networks serves the purpose of tracking mobile users and locating them prior to establishing new communications. Existing location management solutions proposed for single-hop wireless networks cannot be directly applied to Internet-based WMNs. Hence, a dynamic location management framework in Internet-based WMNs is proposed that can guarantee the location management performance and also minimize the protocol overhead. In addition, a novel resilient location area design in Internet-based WMNs is also proposed. The formation of the location areas can adapt to the changes of both paging load and service load so that the tradeoff between paging overhead and mobile device power consumption can be balanced, and at the same time, the required QoS performance of existing traffic is maintained. Therefore, together with the proposed handoff management design, efficient mobility management can be realized in Internet-based infrastructure WMNs

    Accessing the Internet through Moving Networks

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    Poster at IST Mobile & Wireless Communications Summit 2007, Budapest, Hungary, 1-5 July 2007.The success of cellular communications networks shows the interest of users in mobility. Host mobility support in IP networks is a first step in the adaptation of these networks to the needs of users in this field. But, there exists also the need of supporting the movement of a complete network that changes its point of attachment to the fixed infrastructure. This paper describes the architecture designed in the EU DAIDALOS II project to provide Internet access through moving networks. The designed moving networks architecture support the following main features: Route Optimisation, Multicast traffic delivery, security and authentication integration, end-to-end QoS and interaction with Localised Mobility Management solutions.Publicad

    Fully distributed mobility management scheme for future heterogeneous wireless networks

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    Mobile network operators urgently need to scalable and reliable mobility management solutions to cope with the explosive increase of the mobile users and internet traffic. Although the network-based PMIPv6 protocol is considered the favorable solution to solve the problems of host-based MIP protocol, these protocols are based on centralized mobility management CMM scheme. Current mobility solutions posing several challenges due to heavily centralized architecture. Furthermore, the future 5G networks are based on flat infrastructures to reduce the load in the network core. The distributed mobility management DMM scheme is introduced recently to overcome the problems of CMM. Additionally, to maintain the heterogeneity of future wireless networks, IEEE 802.21 Media Independent Handover (MIH) framework identifies the structure and services to provide seamless handover in heterogeneous networks. In this paper, we develop an efficient network-based fully DMM scheme based on the cross layer design of layer 2 MIH and layer 3 PMIPv6 protocols. The proposed approach removes any central anchor node in the network infrastructure and also eliminates any layer 2 and layer 3 signaling between the mobile node and the access networks. The numerical evaluation shows that the efficient approach gives enhance handover performance in terms of signaling cost, handover latency, and packet loss

    On secure communication in integrated internet and heterogeneous multi-hop wireless networks.

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    Integration of the Internet with a Cellular Network, WMAN, WLAN, and MANET presents an exceptional promise by having co-existence of conventional WWANs/WMANs/WLANs with wireless ad hoc networks to provide ubiquitous communication. We call such integrated networks providing internet accessibility for mobile users as heterogeneous multi-hop wireless networks where the Internet and wireless infrastructure such as WLAN access points (APs) and base stations (BSs) constitute the backbone for various emerging wireless networks (e.g., multi-hop WLAN and ad hoc networks. Earlier approaches for the Internet connectivity either provide only unidirectional connectivity for ad hoc hosts or cause high overhead as well as delay for providing full bi-directional connections. In this dissertation, a new protocol is proposed for integrated Internet and ad hoc networks for supporting bi-directional global connectivity for ad hoc hosts. In order to provide efficient mobility management for mobile users in an integrated network, a mobility management protocol called multi-hop cellular IP (MCIP) has been proposed to provide a micro-mobility management framework for heterogeneous multi-hop network. The micro-mobility is achieved by differentiating the local domain from the global domain. At the same time, the MCIP protocol extends Mobile IP protocol for providing macro-mobility support between local domains either for single hop MSs or multi-hop MSs. In the MCIP protocol, new location and mobility management approaches are developed for tracking mobile stations, paging, and handoff management. This dissertation also provides a security protocol for integrated Internet and MANET to establish distributed trust relationships amongst mobile infrastructures. This protocol protects communication between two mobile stations against the attacks either from the Internet side or from wireless side. Moreover, a secure macro/micro-mobility protocol (SM3P) have been introduced and evaluated for preventing mobility-related attacks either for single-hop MSs or multi-hop MSs. In the proposed SM3P, mobile IP security has been extended for supporting macro-mobility across local domains through the process of multi-hop registration and authentication. In a local domain, a certificate-based authentication achieves the effective routing and micro-mobility protection from a range of potential security threats

    Effect of mobility models on infrastructure based wireless networks

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    The tremendous demand is pushing the development of wireless mobile communications faster than ever before. Handoff management has widely been recognized as one of the most important and challenging problems for a seamless access to wireless network and mobile services. Mobility Models plays an important role in handoff management. In this paper, the effect of handoff procedure on the performance of random mobile nodes in wireless networks was investigated. Mobility of node is defined by various mobility models. Evaluating mobility models within an infrastructured network gives solution to performance measures like blocking probability, dropping probability to evaluate the performance of handoff algorithm. Handoff algorithm based on Absolute and Relative Measurement was used to examine the effect of Random Walk and Gauss Markov mobility models on performance of Infrastructure based Wireless Network. Keywords - Call blocking probability, Call dropping probability, Mobility model

    Infrastructure

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    Infrastructure materially connects more or less distant places by facilitating various social processes and relations across space. Usually understood in physical terms as the material elements shaping resource flows, infrastructure also refers to the institutions and rules conditioning social practice. Recent geographic research has stressed the social, political and economic dimensions of infrastructure. As objects of empirical analysis, infrastructure discloses broad transformations in the production and management of sociotechnical systems, including the “splintering” of collective services and utilities. Conceptually, infrastructure has provided the foundations for methodological and conceptual innovations surrounding ontologies of flow and mobility, and theorizations of society-nature relations that reframe technological networks as unstable, politicized entities

    Infrastructure

    Get PDF
    Infrastructure materially connects more or less distant places by facilitating various social processes and relations across space. Usually understood in physical terms as the material elements shaping resource flows, infrastructure also refers to the institutions and rules conditioning social practice. Recent geographic research has stressed the social, political and economic dimensions of infrastructure. As objects of empirical analysis, infrastructure discloses broad transformations in the production and management of sociotechnical systems, including the “splintering” of collective services and utilities. Conceptually, infrastructure has provided the foundations for methodological and conceptual innovations surrounding ontologies of flow and mobility, and theorizations of society-nature relations that reframe technological networks as unstable, politicized entities
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