Catálogo de publicaciones - libros

Compartir en
redes sociales


Wired: 4th International Conference, WWIC 2006, Bern, Switzerland, May 10-12, 2006, Proceedings

Torsten Braun ; Georg Carle ; Sonia Fahmy ; Yevgeni Koucheryavy (eds.)

En conferencia: 4º International Conference on Wired/Wireless Internet Communications (WWIC) . Bern, Switzerland . May 10, 2006 - May 12, 2006

Resumen/Descripción – provisto por la editorial

No disponible.

Palabras clave – provistas por la editorial

Popular Computer Science; Computer Communication Networks; Information Systems Applications (incl. Internet); Software Engineering; Operating Systems; Personal Computing

Disponibilidad
Institución detectada Año de publicación Navegá Descargá Solicitá
No detectada 2006 SpringerLink

Información

Tipo de recurso:

libros

ISBN impreso

978-3-540-34023-2

ISBN electrónico

978-3-540-34024-9

Editor responsable

Springer Nature

País de edición

Reino Unido

Fecha de publicación

Información sobre derechos de publicación

© Springer Berlin Heidelberg 2006

Tabla de contenidos

Enhanced Fast Handover Mechanism Using MIH Services in MIPv6

Yoon-Young An; Kang-Won Lee; Dong-Won Kum; Sung-Hyup Lee; You-Ze Cho; Byung Ho Yae; Woo-Young Jung

In this paper, we propose an enhanced handover mechanism with new additional primitives and parameters to the media independent handover (MIH) services as defined in IEEE 802.21. The proposed scheme can reduce handover latency for MIPv6 (mobile IPv6) by removing the router discovery time. Moreover, when the proposed mechanism is applied to a FMIPv6 (fast handovers for MIPv6), we can increase the probability that FMIPv6 can be per-formed in a predictive mode by reducing the handover initiation time. As a result, we can get the reduced handover latency in FMIPv6. In addition, with the proposed scheme, we can design the cost-effective network by reducing cover-age overlap between adjacent cells. This is due to the decreased handover initiation time in FMIPv6. From simulation results, it is proven that the proposed scheme can provide a higher goodput for UDP and TCP because it has less service disruption during handovers.

Palabras clave: Mobile Node; Home Agent; Router Discovery; Link Layer; Correspondent Node.

- Session 3: Mobility | Pp. 120-131

NSIS-Based Quality of Service and Resource Allocation in Ethernet Networks

M. Carmo; B. Carvalho; J. Sá Silva; E. Monteiro; P. Simões; M. Curado; F. Boavida

The definition of the IEEE 802.1Q and IEEE 802.1p standards provided Class of Service (CoS) capabilities to Ethernet networks and, consequently, allowed new QoS services to be deployed. This is used by the Subnet Bandwidth Management (SBM) protocol, an RSVP-based protocol that provides IntServ-like services at Ethernet level. This paper proposes an alternative way to quality of service provision and resource allocation in Ethernet networks, based on the emerging IETF NSIS framework. The proposed approach was validated as a proof of concept by simulation, showing the ability of NSIS to provide QoS differentiation in Ethernet scenarios.

- Session 4: Signalling, Charging, and Security | Pp. 132-142

State of the Art Prepaid Charging for IP Services

Pascal Kurtansky; Burkhard Stiller

The provisioning of IP services in the mobile telecommunication and the IP world differs in many aspects, especially with prepaid charging de termining an important useability distinction. Thus, the state of the art of pre paid charging systems have been analyzed in detail, elaborating on their key ca pabilities and major limitations. Additionally, economic aspects in terms of op erator’s risks and major costs, addressing the technical overhead to implement prepaid charging, have been evaluated. Therefore, to enable prepaid charging for QoS-enabled and all-IP environments, key concerns for a future IP service provisioning have been determined, which remain infeasible with existing prepaid solutions, and the evaluation lead to a new scheme proposed.

Palabras clave: Internet Protocol; Mobile Network Operator; Message Sequence Chart; Internet Protocol Network; Internet Protocol Multimedia Subsystem.

- Session 4: Signalling, Charging, and Security | Pp. 143-154

Efficient Protection of Mobile Devices by Cross Layer Interaction of Firewall Approaches

Peter Langendoerfer; Martin Lehmann; Krzysztof Piotrowski

In this paper we discuss IP layer packet filtering and an application level gateway approach used to secure handheld devices when providing and using web services. We propose a firewall management plane as a means for cross layer interaction. In our approach the application level gateway updates the IP layer firewall rules based on its knowledge about whether or not a certain source is sending malicious packets. We show that such a cross layer interaction can significantly decrease the CPU load in case of attacks, i.e., if many malicious packets arrive at the handheld device. Our measurement results show that the additional overhead for IP layer filtering is less than 10 per cent, if the number of applied rule sets is less than 200. In addition our cross layer approach can reduce the CPU load caused by the application layer gateway by about 10 up to 30 per cent.

Palabras clave: Mobile Device; Cross Layer; Incoming Packet; Security Function; Cross Layer Approach.

- Session 4: Signalling, Charging, and Security | Pp. 155-165

Scalability of Name Resolution for Ambient Networks

Pekka Pääkkönen; Nadeem Akhtar; Rui Campos; Cornelia Kappler; Petteri Pöyhönen; Di Zhou

The convergence of mobile domain and data networks has been under focus in the standardization forums. However, dynamic interworking of wired infrastructure, wireless access systems and small scale Personal Area Networks has been challenging due to their heterogeneous nature. One of the most important problems to be solved is name resolution between different terminals and networks. This paper presents a new mechanism for name resolution, which relies on existing naming mechanisms. In particular the focus is on the scalability of the solution from signaling load and latency point of view.

Palabras clave: Session Initiation Protocol; Distribute Hash Table; Signaling Load; Domain Name System; Resolution Mechanism.

- Session 4: Signalling, Charging, and Security | Pp. 166-177

Urban Cellular Planning Optimisation of Multi-service Enhanced UMTS Based in Economic Issues

Orlando Cabral; Fernando J. Velez; Cátia Franco; Ricardo Rei

Results for Enhanced UMTS (E-UMTS) cost/revenue optimisation are obtained, as a function of the coverage distance, R . E-UMTS traffic generation and activity models are described and characterised in an urban scenario based on population and service penetration values. By using a System Level Simulator results were obtained for blocking and handover failure probabilities. Models for the supported fraction of active users and for the supported throughput, as a function of active users, were obtained. When one amplifier is used, the maximum throughput per BS is around 600kb/s. However, it achieves values up to 2000kb/s when three amplifiers per BS are considered. Generally, the profit in percentage is a decreasing function with R . The use of three amplifiers per BS is strongly advised in order to get cheaper communications, with prices that vary from 0.016 to 0.07 €/min, for R =250 and 1075m, respectively.

Palabras clave: Call Admission Control; Cell Radius; System Level Simulator; Coverage Distance; Urban Scenario.

- Session 5: UMTS and OFDM | Pp. 178-189

Traffic Modeling and Characterization for UTRAN

Xi Li; Su Li; Carmelita Görg; Andreas Timm-Giel

This paper presents an analytical approach for characterizing the aggregated traffic carried in the UMTS Terrestrial Radio Access Network (UTRAN). The characteristic of the incoming traffic stream of UTRAN is studied based on the measured trace traffic from the simulations. The main idea of the aggregated traffic modelling is to employ Batch Markov Arrival Process (BMAP) model as an analytically tractable model, which considers different lengths of packets and batch arrivals. In this paper, the setup and customization of the BMAP model for characterizing the aggregated traffic in UTRAN is presented. The accuracy of the BMAP model is demonstrated by comparing with simulations and Poisson traffic model. At the end the potential application of the presented approach and its advantages is briefly discussed.

Palabras clave: Medium Access Control; Traffic Modeling; Universal Mobile Telecommunication System; Traffic Stream; Transmission Time Interval.

- Session 5: UMTS and OFDM | Pp. 190-201

On the Optimal Allocation of Downlink Resources in OFDM-Based Wireless Networks

Patrick Hosein

Orthogonal Frequency Division Multiplexing (OFDM) is used in both 802.11 and 802.16 [1] wireless network standards and is being evaluated for Fourth Generation (4G) networks. Its tolerance to frequency selective fading has made it an attractive choice for these broadband wireless networks. In both downlink and uplink directions, resources can be allocated in three dimensions, frequency, time and power. In both cases the resource allocation is performed primarily by the BS. In this paper we focus on the allocation of downlink resources when such a network is used for Quality of Service (QoS) applications. We formulate and solve the corresponding optimization problem and use the solution to design simple, practical algorithms. In doing so we take into account practical details that have not been addressed in previous work.

Palabras clave: Utility Function; Orthogonal Frequency Division Multiplex; Power Allocation; Optimal Allocation; Optimal Power Allocation.

- Session 5: UMTS and OFDM | Pp. 202-213

Scheme for Joint Optimization of MAP Overhead and System Throughput in Message Based MIMO-OFDM Systems

Chung Ha Koh; Kyung Ho Sohn; Ji Wan Song; Young Yong Kim

We propose a novel resource allocation scheme, which can reduce MAP overhead and maximize the throughput in the MIMO-OFDM systems. Message based broadband access systems are needed to minimize the MAP overhead since the excessive MAP overhead causes degradation of system throughput. Increasing the size of resource allocation unit can reduce MAP overhead. However, multiuser diversity gain becomes smaller as the size of resource allocation unit increases. Therefore, we investigate joint optimization between multiuser diversity gain and MAP overhead size. The proposed scheme can reduce the MAP overhead size as well as achieve high throughput.

- Session 5: UMTS and OFDM | Pp. 214-223

A Novel IEEE 802.11e-Based QoS Protocol for Voice Communications over WLANs

José Villalón; Pedro Cuenca; Luis Orozco-Barbosa

Voice over WLAN (VoWLAN) is widely acknowledged as one of the key, emerging applications for wireless LANs. As with any multi-service network, there is the need to provision the WLANs with the QoS mechanisms capable of guaranteeing the requirements of various services. The upcoming IEEE 802.11e (EDCA) standard is on the way to define the required QoS mechanisms into the protocol architecture of IEEE 802.11 WLANs. However, recent studies have shown that EDCA performs poorly when the medium is highly loaded. This situation has led many researchers to design techniques aiming to improve the performance of EDCA. Unfortunately, the main deficiency of many of the proposed mechanisms to date comes from their inability to properly interoperate with legacy IEEE 802.11 (DCF) systems. Moreover, the implementation of many of the proposed QoS mechanisms requires important and incompatible changes to the IEEE 802.11e specifications. In this paper we introduce a novel IEEE 802.11e-based QoS protocol capable of providing QoS support to voice communications, and able to properly interoperate with legacy DCF based stations. Our design has been based on an in-depth analysis of the several operation modes of both standards. This should ensure full compatibility of operation: an important feature since the transition from the IEEE 802.11 to the IEEE 802.11e will take some time making more likely the existence of hybrid scenarios where both standards will have to coexist. Our results show that the proposed mechanism outperforms the IEEE 802.11e standard by offering better QoS guarantees to the voice service over a wider range of load conditions and traffic mix scenario.

- Session 6: Voice and Video over Wireless Networks | Pp. 224-235