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Wireless Communications, IEEE

Issue 2 • Date April 2008

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Displaying Results 1 - 17 of 17
  • Front cover - IEEE Wireless Communications - April 2008

    Page(s): c1
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    Freely Available from IEEE
  • Table of contents - Vol 15 no 2

    Page(s): 1
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    Freely Available from IEEE
  • Mobility management [Message from the Editor-in-Chief]

    Page(s): 2 - 3
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    Freely Available from IEEE
  • Scanning the literature

    Page(s): 4 - 5
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    Freely Available from IEEE
  • Architectures and protocols for mobility management in all-IP mobile networks [guest editorial]

    Page(s): 6 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (104 KB) |  | HTML iconHTML  

    The seven Special Topic articles focus on the architectures and protocols for mobility management in all-IP mobile networks. The articles are summarized here. View full abstract»

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  • A mobility toolbox architecture for all-IP networks: an ambient networks approach

    Page(s): 8 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (430 KB) |  | HTML iconHTML  

    The future Internet will need to cater to an increasing number of mobile devices and mobile networks, roaming across different access networks and trust domains. In addition, various limitations imposed by the end user, service provider, or network operator agreements and preferences will need to be considered. A plethora of mobility management protocols have been proposed to handle different and mostly limited sets of these mobility requirements. In this article we make the case for coexistence of mobility protocols in order to support the large range of mobility scenarios possible in future all-IP networks. This coexistence takes the form of a mobility toolbox that enables mobility handling mechanisms to be selected according to the context. We then present a design for the mobility toolbox as a component of the ambient networks architecture, including a simplified mobility tool interface toward protocol modules, and show how it meets the requirements of future all-IP networks. We further demonstrate the feasibility and performance gains of the mobility toolbox architecture with a prototype implementation based on network mobility. View full abstract»

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  • Architectures for IP-based network-assisted mobility management across heterogeneous networks

    Page(s): 18 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (117 KB) |  | HTML iconHTML  

    In this article new architectures for network- assisted management of vertical handovers are proposed, relying on IP-based protocols, aiming at achieving the most relevant intersystem mobility decision with respect to user satisfaction and operator added value. The key design principle used is ease of deployment, with flexible hierarchical handover decision entities allowing the distribution of the decision process across local and global levels. The decision itself relies on a broad set of parameters at the radio, networking, application, user preferences, and operator policies levels. The advantage of the approach is highlighted in the specific cellular/WLAN scenario, and a proof-of-concept testbed has enabled to validate it. Standardization in this area is currently ongoing in 3GPP, IEEE, and IETF. View full abstract»

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  • Mobility using IEEE 802.21 in a heterogeneous IEEE 802.16/802.11-based, IMT-advanced (4G) network

    Page(s): 26 - 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (147 KB) |  | HTML iconHTML  

    Industry is defining a new generation of mobile wireless technologies, called in cellular terminology "fourth generation" or "4G." This article shows that a system combining extensions of two radio access technologies, IEEE 802.11 and IEEE 802.16, meets the ITU-R's "IMT-Advanced" or 4G requirements. The extensions are 802.16 m (100 Mb/s, 250 km/h) and 802.11VHT (1 Gb/s, low velocity). The focus of this article is to show how IEEE 802.21 (the emerging IEEE standard for media-independent handover services) supports ";seamless"; mobility between these two radio access technologies. This mobility integrates the two radio access technologies into one system. We conclude that an 802.11VHT + 802.16 m + 802.21 system is likely to be proposed to the ITU-R for IMT- Advanced 4G. View full abstract»

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  • Mobility management for all-IP mobile networks: mobile IPv6 vs. proxy mobile IPv6

    Page(s): 36 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (151 KB) |  | HTML iconHTML  

    Recently, a network-based mobility management protocol called Proxy Mobile IPv6 (PMIPv6) is being actively standardized by the IETF NETLMM working group, and is starting to attract considerable attention among the telecommunication and Internet communities. Unlike the various existing protocols for IP mobility management such as Mobile IPv6 (MIPv6), which are host-based approaches, a network-based approach such as PMIPv6 has salient features and is expected to expedite the real deployment of IP mobility management. In this article, starting by showing the validity of a network-based approach, we present qualitative and quantitative analyses of the representative host-based and network-based mobility management approaches (i.e., MIPv6 and PMIPv6), which highlight the main desirable features and key strengths of PMIPv6. Furthermore, a comprehensive comparison among the various existing well-known mobility support protocols is investigated. Although the development of PMIPv6 is at an early stage yet, it is strongly expected that PMIPv6 will be a promising candidate solution for realizing the next-generation all-IP mobile networks. View full abstract»

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  • Mobility management protocols for next-generation all-IP satellite networks

    Page(s): 46 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (149 KB) |  | HTML iconHTML  

    To provide ubiquitous terrestrial Internet coverage mobility and Internet-based access to data generated by satellites, there is a strong desire to integrate the terrestrial Internet and satellite networks. This requires satellites that are based on IP for communications. Rotation of low Earth orbit satellites around the Earth results in communicating with different ground stations over time, and requires mobility management protocols for seamless communication between the Internet and satellite networks. In this article we provide a comprehensive summary and comparison of state-of-the-art research on mobility management schemes for satellite networks. The schemes are based on network and transport layers for managing host and network mobility. This article clearly indicates the aspects that need further research and which mobility management schemes are the best candidates for satellite networks. View full abstract»

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  • Media-independent pre-authentication supporting secure interdomain handover optimization

    Page(s): 55 - 64
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (141 KB) |  | HTML iconHTML  

    Handovers may cause delays and packet losses that affect real-time communication performance. Mobility protocols at several layers are designed to support handover, but they need to be optimized to ensure high-quality application performance. Existing optimization techniques are not sufficient to take care of interdomain and intertechnology handovers involving different access technologies, such as Wi-Fi, GSM, CDMA, and WiMAX. We categorize several types of handover, describe handover delay components, and propose a handover optimization framework called media independent pre-authentication that can provide optimizations for interdomain and intertechnology handover in a manner that is transparent to mobility management protocols. In addition, we also present experimental results demonstrating that this framework can achieve a significant reduction in handover delays for both network-layer and application-layer mobility management protocols. View full abstract»

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  • Thorough empirical analysis of the IETF FMIPv6 protocol over IEEE 802.11 networks

    Page(s): 65 - 72
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    The development of network technologies such as wireless LAN have made it possible for users to benefit from Internet connectivity almost anywhere and at anytime. In order to improve user experience, the IETF has defined the Mobile IPv6 protocol which allows mobile nodes to maintain their communication uninterrupted while roaming across various IPv6 subnets. However, the mechanisms this protocol defines may cause undesired connection disruption and/or substantial packet loss which may significantly degrade the quality of real-time media streams. To address the problems of handover latency, the Mipshop IETF working group has adopted and developed the FMIPv6 protocol. Previous analysis, including some of our own, has shown that the protocol is particularly efficient in reducing both the duration of handovers and the number of lost packets. However, these previous works are often based on theoretical studies and simulations, or do not analyze all FMIPv6 operations and features. We therefore present in this article a thorough experimental evaluation of FMIPv6 over wireless LANs. This article extends our previous work by evaluating all aspects of FMIPv6: predictive handovers, reactive handovers, and network-initiated handovers. We also evaluate the benefits of FMIPv6 on layer 2 only handovers. All experiments are conducted with unmodified versions of the popular conferencing and video streaming applications Gnomemeeting and VLC. View full abstract»

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  • Networking for critical conditions

    Page(s): 73 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    To enhance the preparedness of federal and state agencies to effectively manage federal or state recovery efforts in response to a broad spectrum of emergencies, we propose a hybrid adaptive network that will adopt currently available off-the-shelf wireless network devices and integrate them quickly into a scalable, reliable, and secure network with a minimum of human intervention for configuration and management. This model will serve as the framework for various rescue missions for securing and distributing critical resources. We investigate different technologies and network strategies and integrate them into the proposed network model to provide seamless support to heterogeneous environments including wireline nodes, ad hoc and sensor network nodes, and network devices based on different standards. In this article we present the network architecture and identify the key technical aspects of its management, security, QoS, and implementation. View full abstract»

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  • Terminal-embedded beamforming for wireless local area networks

    Page(s): 82 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    In dense traffic areas, wireless local area networks (WLANs) suffer from interference problems due to the congestion of the open and unlicensed ISM band. To mitigate these problems, a terminal-embedded beamforming framework is proposed. This beamforming is capable of focusing the transmission and the reception in the direction of the relevant access point. At the same time, the framework is backward compatible with existing WLAN networks. The beam- forming enabled terminal benefits in terms of capacity, security, and energy efficiency without requiring any changes on the network side or requiring new investment on the part of network providers. The beamforming solution is seen as an attractive value-added feature, as well as a low-cost solution for the future WLAN terminal design. This opens the door for mobile device manufacturers to include the proposed solution in their product line. In this work, the backward- compatibility challenges are addressed, and possible solutions and limitations are discussed. A prototype design built on a laptop computer also is described. The experimental results show a significant capacity increase in both an interference-free scenario and an interference-limited scenario. View full abstract»

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  • SIP-based mobility management in next generation networks

    Page(s): 92 - 99
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    The ITU-T definition of next generation networks includes the ability to make use of multiple broadband transport technologies and to support generalized mobility. Next generation networks must integrate several IP-based access technologies in a seamless way. In this article, we first describe the requirements of a mobility management scheme for multimedia real-time communication services; then, we report a survey of the mobility management schemes proposed in the recent literature to perform vertical handovers between heterogeneous networks. Based on this analysis, we propose an application-layer solution for mobility management that is based on the SIP protocol and satisfies the most important requirements for a proper implementation of vertical handovers. We also implemented our proposed solution, testing it in the field, and proving its overall feasibility and its interoperability with different terminals and SIP servers. View full abstract»

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  • Radio resource management for cooperative wireless communication systems with organized beam-hopping techniques

    Page(s): 100 - 109
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    Readiness in deployment and flexibility in radio resource configuration are the main features of future wireless communication systems. A cooperative wireless communication system (CWCS) is proposed to follow the same principle, aiming at improving the overall performance of a wireless system with the support of advanced beam-hopping techniques. In this article, we propose a multiloop radio resource management mechanism for the CWCS based on the organized beam-hopping (OBH) technique. The proposed RRM mechanism enhances the robustness of the CWCS, based on the OBH technique working with fast temporal-spatial variant traffic. The results show that the system performance can be further improved by hybrid transmission and event- driven access management techniques. View full abstract»

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  • An open baseband processing architecture for future mobile terminal design

    Page(s): 110 - 119
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    This article introduces an open wireless architecture (OWA) mobile terminal design, focusing on the open baseband processing platform, to support different existing and future wireless communication standards through multi-dimensional open baseband processing modules with open interface parameters and baseband management systems. The article describes a multilayer, open architecture platform to maximize system flexibility and minimize terminal power consumption, so as to provide an integrated and converged next-generation wireless and mobile communication terminal system. The OWA platform is fully compatible with the computer architecture, with interface-based rather than transmission-specific system architecture, for complete openness and simplicity. View full abstract»

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Aims & Scope

IEEE Wireless Communications Magazine deals with all technical and policy issues related to personalization, location-independent communications in all media.

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Meet Our Editors

Editor-in-Chief
Hsiao-Hwa Chen
Cheng Kung University, Taiwan