Wireless ATM for broadband multimedia wireless access: the ATMmobil project

Keller, Ralf; Walke, Bernhard; Fettweis, Gerhard; Bostelmann, G.; Möhrmann, Karl Heinz; Herrmann, Christoph; Kraemer, Rolf

doi:10.1109/98.799622

Cited by 13 publications

(11 citation statements)

References 12 publications

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“…The authors would like to thank A. Krämling, J. Rapp, C. Walke, M. Radimirsch, and the colleagues of the ATMmobil project (especially the authors of [1]). …”

Section: Acknowledgmentmentioning

confidence: 98%

“…To meet the networking requirements for multimedia services of tomorrow, new generations of both WLANs and cellular networks are under development [1]- [3]. These requirements include QoS support for multiservice networks, security, handover when roaming between local and wide area as well as between corporate and public networks, and, of course, increased throughput and small transmission delay for the ever-increasing demand of datacom as well as video streaming applications.…”

Section: Introductionmentioning

confidence: 99%

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IP over wireless mobile ATM-guaranteed wireless QoS by HiperLAN/2

et al. 2001

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Wireless local area networks (WLANs) designed as wireless ATM systems to extend the services of fixed ATM networks to mobile users appear best suited to provide a guaranteed quality of service (QoS) for wireless IP networks. HiperLAN/2 is an ETSI/BRAN standard providing convergence layers for both IP and ATM classes of service. Besides a description of HiperLAN/2 and its Home Environment Extension, the performance for IP traffic flows is presented from analysis and from simulating a prototype implementation. Coexistence with the IEEE 802.11a WLAN is discussed and the ability of HiperLAN/2 to guarantee QoS even when coexisting is analyzed.Ad hoc networking of HiperLAN/2 is analyzed and two possible extensions of the system are introduced and their performance evaluated, namely, adaptive antennas and wireless base stations.

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“…The authors would like to thank A. Krämling, J. Rapp, C. Walke, M. Radimirsch, and the colleagues of the ATMmobil project (especially the authors of [1]). …”

Section: Acknowledgmentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

IP over wireless mobile ATM-guaranteed wireless QoS by HiperLAN/2

et al. 2001

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“…Several solutions to error control in wireless ATM networks have been proposed in the literature. The techniques used in these solutions include using ARQ limiting the number of retransmissions for delay sensitive applications [2], FEC (with or without concatenated codes) or a hybrid type 1 ARQ-FEC scheme [1][4] [5][8]- [12], FEC code to protect the header and another one to protect the payload [13] [14], adaptive FEC codes with or without ARQ [13][15]- [18] and FEC code (more powerful than the code specified to the Header Error Control), adaptive or not, to protect the header [19].…”

Section: Introductionmentioning

confidence: 99%

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mentioning

confidence: 99%

A New Hybrid ARQ-FEC Scheme For Wireless ATM Networks

Brito¹,

Bonatti²

2005

Journal of Communication and Information Systems

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Several research projects have been proposed in the last few years, such as: the WATMnet project, developed by NEC for personal multimedia networks in a micro-cellular environment with fixed and mobile terminals [28]; the Magic Wand (Wireless ATM Network Demonstrator) project, proposed by European Union ACTS (Advanced Communications Technologies and Services), for indoor environment with mobile terminals [2]; the BAHAMA project proposed by Bell Laboratories, for ad hoc local area networks with mobile terminals [3]; the SWAN (Seamless Wireless ATM Networks) developed by Bell Laboratories for indoor networks with picocellular environment and mobile terminals [4]; the ATMmobil project, proposed by a pool of universities and enterprises in Germany, considering four different scenarios: local area networks, mobile broadband cellular networks, residential networks, and fixed access networks [5].Abstract -Wired ATM (Asynchronous Transfer Mode) networks are designed taking into account an optical link in the physical layer. The main problem to implement a wireless ATM network is the fact that its radio link bit error rate is high and variable, demanding the use of an additional error control mechanism. The usual techniques for error control are ARQ (Automatic Repeat Request) and FEC (Forward Error Correction). ARQ works better than FEC if the channel bit error rate is low, and is worse if it is high, thus indicating that hybrid ARQ-FEC techniques can improve the radio link performance. A new hybrid ARQ-FEC scheme with multiple FEC states is proposed in this paper. The performance of the proposed scheme is compared with non-adaptive ARQ and FEC schemes, which have similar complexities, and with an ideal adaptive FEC scheme. It is shown that the proposed scheme works better than the nonadaptive schemes, and that the hybrid and the ideal adaptive FEC schemes have similar performances. Moreover, the hybrid scheme does not require an estimate of the bit error rate in the channel, leading to a less complex implementation.In general, the goal of wireless ATM networks is to provide the same characteristics of the wired ATM networks, in a transparent way, through a wireless link, for fixed or mobile terminals. Thus, wireless ATM networks must integrate several kinds of traffic with guaranteed quality of service. The main problems to make the wireless ATM networks feasible are related to the following research areas [3][6][7]: mobility management, multiple access protocol and error control in the wireless link.

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“…The Integrated Broadband Mobile System [1] is a concept for future mobile communications that integrates different environments and air interfaces (outdoor, indoor, infrared) to optimally support heterogeneous user requirements.…”

Section: Introductionmentioning

confidence: 99%

From Smart Antennas to Reduced Dimension Space-Time Processing

Jelitto¹,

Bronzel²,

Fettweis³

2001

Frequenz

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The Integrated Broadband Mobile System (IBMS) is a concept for future wireless communications systems that has been developed in order to integrate heterogeneous services and applications into a common framework. Smart antennas are used as the enabling technology to support high and variable data rates. A hardware testbed was developed for the investigation of algorithms and real-time aspects of smart antennas, which uses separate stages for processing of spatial and temporal information. Research results indicate that the system performance can be enhanced using a space-time processor (STP) which carries out spatial and temporal information processing jointly. This paper reviews the IBMS physical layer and presents the results obtained with the smart antenna demonstrator. A new STP concept with reduced signal dimension by means of the Karhunen-Loeve-Transformation (KLT) is introduced and analyzed. Übersicht Das Integrierte Breitbandbandige Mobilkommunikations-System (IBMS) ist ein Konzept für die zukünftige Mobilkommunikation, welches durch Einsatz verschiedener Schlüsseltechnologien die Integration verschiedenartiger Dienste in ein gemeinsames Gesamtsystem ermöglicht. Zur Bereitstellung hoher und variabler Datenraten werden in diesem System intelligente Antennen eingesetzt. Algorithmen zur adaptiven Strahlformung wurden im Hinblick auf ihre Leistungsfähigkeit unter Echtzeitbedingungen untersucht und auf einem Hardware-Testbed demonstriert, das räumliche und zeitliche Informationen getrennt verarbeitet. Darüber hinaus wurden kombinierte Raum-Zeit-Verarbeitungsansätze analysiert, welche der getrennten räumlichen und zeitlichen Verarbeitung in vielen Bereichen überlegen sind. In dieser Arbeit werden die wichtigsten Parameter der physikalischen Schicht des IBMS zusammengefaßt und der .IBMS Smart Antenna Demonstrator* vorgestellt. Darüber hinaus wird ein neuartiges Konzept zur dimensionsreduzierten Raum-Zeit-Verarbeitung vorgestellt und analysiert, welches auf der Karhunen-Loeve-Transformation (KLT) beruht. Für die Dokumentation Strahlformung / Raum-Zeit-Signalverarbeitung / Low-rank modeling / Karhunen-Loeve-Transformation / IBMS Frequenz 55(2001) 5-6

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Wireless ATM for broadband multimedia wireless access: the ATMmobil project

Cited by 13 publications

References 12 publications

IP over wireless mobile ATM-guaranteed wireless QoS by HiperLAN/2

IP over wireless mobile ATM-guaranteed wireless QoS by HiperLAN/2

A New Hybrid ARQ-FEC Scheme For Wireless ATM Networks

From Smart Antennas to Reduced Dimension Space-Time Processing

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