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Mobility Support (mobility + support)

Distribution by Scientific Domains
Engineering75%

Selected Abstracts

AAA architecture for mobile IPv6 based on WLAN

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 5 2004
R. C. Wang
Mobility support for Internet devices is quite important for consumer electronics. The number of the hand-held devices is growing quickly. However, there are not enough IP addresses for the number of the rapidly growing devices in the All-IP generation. Internet Protocol version 6 (IPv6) was therefore adopted to solve these problems. Our purposed structure is based on IEEE 802.11. However, IEEE 802.11 has a serious security drawback. Further, from the Internet Service Providers' point of view, accounting is a potential problem. A mechanism combining Mobile IPv6 and AAA based on IEEE 802.11 to overcome these problems is essential. Both Internet Protocol version 4 (IPv4) and IPv6 support IP security (IPsec) when data packets are exchanged across the IP network. IPsec operates at the IP layer. It can support system authentication and authorization, However, it lacks a system accounting function. Therefore ISPs cannot establish correct billing for their services. This is the reason why we chose to combine the wireless network and AAA functions. In this paper, the AAA mechanism is used to protect security, with the architecture having authentication, authorization, and accounting functions. We will discuss the benefits of AAA and state the reason why we choose to combine AAA with the mobility architecture.,Copyright © 2004 John Wiley & Sons, Ltd. [source]

Congestion control for multimedia applications in the wireless internet

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 7 2004
Veselin Rakocevic
Abstract This paper provides a parallel review of two important issues for the next-generation multimedia networking. Firstly, the emerging multimedia applications require a fresh approach to congestion control in the Internet. Currently, congestion control is performed by TCP; it is optimised for data traffic flows, which are inherently elastic. Audio and video traffic do not find the sudden rate fluctuations imposed by the TCP multiplicative-decrease control algorithm optimal. The second important issue is the mobility support for multimedia applications. Wireless networks are characterized by a substantial packet loss due to the imperfection of the radio medium. This increased packet loss disturbs the foundation of TCP's loss-based congestion control. This paper contributes to the ongoing discussion about the Internet congestion control by providing a parallel analysis of these two issues. The paper describes the main challenges, design guidelines, and existing proposals for the Internet congestion control, optimised for the multimedia traffic in the wireless network environment. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Personal mobility support in future service architectures

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 9 2001
P. P. Demestichas
Abstract Support for personal mobility will be among the key factors for success in the competitive communications market of the future. This paper proposes enhancements to the personal mobility support capabilities of service architectures. The TINA service architecture is used as a reference, even though our approach is applicable to other models as well. Our starting point is a business case that falls into the realm of personal mobility. The aim of the business case is to enable users that are found outside their home domain to access services by choosing the best visited retailer, i.e. the one offering adequate quality services in the most cost-efficient manner. In the sequel the following key issues are addressed. First, the introduction of the additional functionality that is required for supporting the business case, and the realisation through appropriate service components. Second, the integration of the new service components in the standard TINA service architecture. Third, the detailed description of a version of the logic of the new components. In this last respect, we formally state, mathematically formulate and solve problems related to the visited retailer selection. Copyright © 2001 John Wiley & Sons, Ltd. [source]

DVB-RCS goes mobile: Challenges and technical solutions

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 3-4 2010
Ana Bolea Alamanac
Abstract This article presents an overview of the DVB-RCS system addressing mobile scenarios (DVB-RCS+M). It analyses the challenges linked to the mobility support and it summarizes some of the techniques to cope with those challenges. The focus of this article will be on the technical solutions analyzed within the framework of ESA studies and contracts. In particular, this article will address in detail the proactive retransmission technique and the seamless handover mechanisms including beam, satellite, gateway and gap-filler handovers. Copyright © 2010 John Wiley & Sons, Ltd. [source]