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183
Application-Layer Mobility Using SIP
- Mobile Computing and Communications Review
, 2000
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Design, Implementation, and Evaluation of Cellular IP
- IEEE Personal Communications
, 2000
"... Wireless access to Internet services will become typical, rather than the exception as it is today. Such a vision presents great demands on mobile networks. Mobile IP represents a simple and scalable global mobility solution but lacks the support for fast handoff control and paging found in cellul ..."
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Cited by 106 (4 self)
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Wireless access to Internet services will become typical, rather than the exception as it is today. Such a vision presents great demands on mobile networks. Mobile IP represents a simple and scalable global mobility solution but lacks the support for fast handoff control and paging found in cellular telephony networks. In contrast, second- and third-generation cellular systems offer seamless mobility support but are built on complex and costly connection-oriented networking infrastructure that lacks the inherent flexibility, robustness, and scalability found in IP networks. In this article we present Cellular IP, a micro-mobility protocol that provides seamless mobility support in limited geographical areas. Cellular IP, which incorporates a number of important cellular system design principles such as paging in support of passive connectivity, is built on a foundation of IP forwarding, minimal signaling, and soft-state location management. We discuss the design, implementation, ...
IP micro-mobility protocols
- IEEE Wireless Communications
, 2002
"... The IETF Mobile IP Working Group is discussing a number of enhancements to the base protocol to reduce the latency, packet loss and signaling overhead experienced during hand-off. bz this article, we discuss a number of "micro-mobility protocols " that extend Mobile IP with fast ha ..."
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Cited by 97 (2 self)
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The IETF Mobile IP Working Group is discussing a number of enhancements to the base protocol to reduce the latency, packet loss and signaling overhead experienced during hand-off. bz this article, we discuss a number of "micro-mobility protocols " that extend Mobile IP with fast handoff and paging capabilities. The aim of this article is not to provide an ex-haustive survey of these protocols. Rather, we discuss the motivation behind micfv-mobility, present common characteristics that a number of proposals share and briefly describe some of the key contributions discussed by the working group. In the longer tetwt there is a need to understand the differences between many of the micro-mobility proposals discussed in this article in terms of complexity of the design choice, and performance di~emnces. As part of that process we have recently made available the Columbia Micro-mobility Suite (CMS). The CMS software is freely available from the web (comet.columbia.edu/micromobility) and includes ns source code extensions for Celhdar IP, Hawaii and Hierarchical Mobile IP. I.
A seamless and proactive end-to-end mobility solution for roaming across heterogeneous wireless networks
- IEEE Journal on Selected Areas in Communications
, 2004
"... Zhu, Senior Member, IEEE Roaming across heterogeneous wireless networks such as wireless wide area network (WWAN) and wireless local area network (WLAN) poses considerable challenges, as it is usually difficult to maintain the existing connections and guarantee the necessary quality of service (QoS) ..."
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Cited by 46 (2 self)
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Zhu, Senior Member, IEEE Roaming across heterogeneous wireless networks such as wireless wide area network (WWAN) and wireless local area network (WLAN) poses considerable challenges, as it is usually difficult to maintain the existing connections and guarantee the necessary quality of service (QoS). This paper proposes a novel seamless and proactive end-to-end mobility management system, which can maintain the connections based on the end-to-end principle by incorporating an intelligent network status detection mechanism. The proposed system consists of two components, Connection Manager (CM) and Virtual Connectivity (VC). The CM, by using novel Media Access Control (MAC)-layer and physical-layer sensing techniques, can obtain accurate network condition while at the same time reducing the unnecessary handoff and ping-pong effect. The VC, can make mobility transparent to applications without additional network-layer infrastructure support using a Local Connection Translation (LCT), and can handle mobility well in Network Address Translator (NAT) and simultaneous movement cases using a Subscription/Notification (S/N) service. The proposed system enjoys several unique advantages: 1) capable of reacting to roaming events proactively and accurately; 2) maintaining the connection’s continuity with small handoff delay; and 3) being a unified end-to-end approach for both IPv4 and IPv6 networks. We have built a prototype system and performed experiments to demonstrate the advantages of the proposed system. Index Terms-WWAN/WLAN handoff, network condition detection, mobility management.
Great expectations: The value of spatial diversity in wireless networks
- PROCEEDINGS OF THE IEEE
, 2004
"... In this paper, the effect of spatial diversity on the throughput and reliability of wireless networks is examined. Spatial diversity is realized through multiple independently fading transmit/receive antenna paths in single-user communication and through independently fading links in multiuser commu ..."
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Cited by 45 (8 self)
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In this paper, the effect of spatial diversity on the throughput and reliability of wireless networks is examined. Spatial diversity is realized through multiple independently fading transmit/receive antenna paths in single-user communication and through independently fading links in multiuser communication. Adopting spatial diversity as a central theme, we start by studying its information-theoretic foundations, then we illustrate its benefits across the physical (signal transmission/coding and receiver signal processing) and networking (resource allocation, routing, and applications) layers. Throughout the paper, we discuss engineering intuition and tradeoffs, emphasizing the strong interactions between the various network functionalities.
Dynamic Hierarchical Mobility Management Strategy for Mobile IP Networks
- IEEE Journal on Selected Areas in Communications
, 2004
"... Abstract—One of the major challenges for the wireless network design is the efficient mobility management, which can be addressed globally (macromobility) and locally (micromobility). Mobile Internet protocol (IP) is a commonly accepted standard to address global mobility of mobile hosts (MHs). It r ..."
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Cited by 33 (1 self)
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Abstract—One of the major challenges for the wireless network design is the efficient mobility management, which can be addressed globally (macromobility) and locally (micromobility). Mobile Internet protocol (IP) is a commonly accepted standard to address global mobility of mobile hosts (MHs). It requires the MHs to register with the home agents (HAs) whenever their care-of addresses change. However, such registrations may cause excessive signaling traffic and long service delay. To solve this problem, the hierarchical mobile IP (HMIP) protocol was proposed to employ the hierarchy of foreign agents (FAs) and the gateway FAs (GFAs) to localize registration operations. However, the system performance is critically affected by the selection of GFAs and their reliability. In this paper, we introduce a novel dynamic hierarchical mobility management strategy for mobile IP networks, in which different hierarchies are dynamically set up for different users and the signaling burden is evenly distributed among the network. To justify the effectiveness of our proposed scheme, we develop an analytical model to evaluate the signaling cost. Our performance analysis shows that the proposed dynamic hierarchical mobility management strategy can significantly reduce the system signaling cost under various scenarios and the system robustness is greatly enhanced. Our analysis also shows that the new scheme can outperform the Internet Engineering Task Force mobile IP hierarchical registration scheme in terms of the overall signaling cost. The more important contribution is the novel analytical approach in evaluating the performance of mobile IP networks. Index Terms—Mobile IP (MIP), mobility management, roaming, wireless networks. I.
Performance Issues with Vertical Handovers - Experiences from GPRS Cellular and WLAN hot-spots Integration
- in Proc. IEEE PerCom
, 2004
"... Interworking heterogeneous wireless access technologies is an important step towards building the next generation, all-IP wireless access infrastructure. In this paper, we present an experimental study of inter-network mobility between GPRS Cellular and 802.11b-based WLAN hot-spots, and analyse its ..."
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Cited by 27 (5 self)
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Interworking heterogeneous wireless access technologies is an important step towards building the next generation, all-IP wireless access infrastructure. In this paper, we present an experimental study of inter-network mobility between GPRS Cellular and 802.11b-based WLAN hot-spots, and analyse its impact on active transport TCP flows. Our experiments were conducted over a loosely-coupled, Mobile IPv6-based, GPRS-WLAN experimental testbed. Detailed analysis from packet traces of inter-network (vertical) handovers reveals a number of performance bottlenecks. In particular, the disparity in the round trip time and bandwidth offered by GPRS and WLAN networks, and presence of deep buffers in GPRS, can aggravate performance during vertical handovers. This paper summerizes the practical experiences and challenges of providing transparent mobility in heterogeneous environments.
P-MIP: Paging Extensions for Mobile IP
- ACM Mobile Networks and Applications
, 2002
"... As the number of Mobile IP users grows, so will the signalling overhead associated with Internet mobility management in the core IP network. ..."
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Cited by 27 (1 self)
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As the number of Mobile IP users grows, so will the signalling overhead associated with Internet mobility management in the core IP network.
Mobile IP and Ad Hoc Networks: An Integration and Implementation Experience
"... Mobile IP has been widely accepted as a standard to support IP mobility in a wireless Internet environment to keep a session connected when a mobile host roams from subnet to subnet. Another emerging wireless network architecture that is gaining more and more popularity is the mobile ad hoc network ..."
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Cited by 19 (0 self)
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Mobile IP has been widely accepted as a standard to support IP mobility in a wireless Internet environment to keep a session connected when a mobile host roams from subnet to subnet. Another emerging wireless network architecture that is gaining more and more popularity is the mobile ad hoc network (MANET), which can be flexibly deployed in almost any environment without the need of infrastructure base stations. In order to move to an all-IP environment, there seems to be a growing demand to integrate these two architectures together.
