Wireless Future - Telenor

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64 4 BRAIN homepage. (2001, March 6) [online]. – URL: http://www.ist-brain.org 5 Robles, T, Umeda, N, Neureiter, G. Service scenarios and business model in BRAIN project. BRAIN workshop in London, Nov. 2000. (2001, March 6) [online]. – URL: http://www.ist-brain.org/ 6 Kassler, A et al. An open end system architecture for adaptable multimedia services with QoS support. BRAIN workshop in London, Nov. 2000. (2001, March 6) [online]. – URL: http://www.ist-brain.org/ 7 IETF. 1999. Session Initiation Protocol. (RFC 2543.) 8 IETF. 1997. Resource ReSerVation Protocol (RSVP) – Version 1, Functional Specification. (RFC 2205.) 9 IETF. 1998. Temporally-Ordered Routing Algorithm (TORA) Version 1 – Functional Specification. Work in Progress (draft-ietfmanet-tora-spec-01). 10 IETF. 2000. Edge Mobility Architecture. Work in Progress (draft-oneill-ema-02.txt). 11 IETF. 1999. IP micro-mobility support using HAWAII. Work in Progress (draft-ietfmobileip-hawaii-01). 12 David, K et al. A first evaluation of IP based network architectures. In: Proceedings of the IST Mobile Summit 2000, October 2000. 13 Keszei, C et al. Mobility management and QoS in BRAIN access networks. BRAIN workshop in London, Nov. 2000. [online] – URL: http://www.ist-brain.org/ 14 IETF. 2001. Mobility Related Terminology. Work in progress (draft-manner-seamobyterms-00.txt). 15 Laukkanen, A et al. IP to Wireless Convergence Interface. BRAIN workshop in London, Nov. 2000. [online] – URL: http://www.ist-brain.org/ 16 Bonjour, S et al. IP convergence layer for HIPERLAN/2. BRAIN workshop in London, Nov. 2000. [online] – URL: http://www.istbrain.org/ 17 Bolinth, E et al. BRAIN enhancements for the HIPERLAN/2 Air Interface to support QoS in Wireless Communications. In: Proceedings of the IST Mobile Summit 2000, October 2000. Telektronikk 1.2001
Joakim Persson (35) received his MSc in Computer Engineering and his PhD in Information Theory from Lund University, Sweden in 1990 and 1996, respectively. He joined the research department at Ericsson Mobile Communications AB in 1996, and from 1999 he is technical manager for the New Technology section within this department. He has been working with Bluetooth since 1997, and is one of the key contributors to the baseband specification. He is now playing an active role in the work within Bluetooth SIG that looks into the future evolution of the system. Joakim.Persson@ecs.ericsson.se Jaap C. Haartsen (38) joined Ericsson Mobile Communications in 1991 and has since worked at sites in RTP, USA and in Lund, Sweden in the area of wireless technology. In Sweden he laid the foundations for the Bluetooth radio concept. He is currently located in Emmen, the Netherlands, where he holds the position of Expert, Wireless Systems. He has recently been appointed adjunct professor at the Twente University of Technology, in the area of Mobile Radio Communications. He earned his MSc and PhD degrees in electrical engineering from the Delft University of Technology, the Netherlands. He has authored numerous papers and holds over 30 patents. Jaap.Haartsen@eln.ericsson.se Telektronikk 1.2001 Enabling Wireless Connections using Bluetooth JOAKIM PERSSON AND JAAP HAARTSEN A new wireless technology called Bluetooth has recently emerged as the de facto standard for wireless ad-hoc connectivity of devices within a relatively short distance from each other. The technology is supported by a large number of leading companies in the telecom, computer, and consumer areas. This paper discusses the basic functionality of this system, both from a technical standpoint as well as from a user perspective. Furthermore, we will also look ahead and see how some usage scenarios and their particular demands are likely to influence the technology, leading to the evolution of the system. 1 Background In 1994, a few people at Ericsson Mobile Communication sat down to discuss a particular problem regarding how to connect a laptop to a mobile phone. The outcome of the discussion was to opt for a wireless radio link. This simple application was the origin of what is now known as Bluetooth. Since then, the system has evolved considerably. The simple point-to-point connection that originally was the intended use for Bluetooth now also includes network functionality. Many interesting user applications have emerged which were not envisioned from the beginning, for instance background synchronisation (see Figure 1). The special needs of Bluetooth hosts running on batteries has been addressed with certain low power modes in the baseband and link manager protocols. Certainly, one of the most important aspects of any communication system is the user experience and usability. History is full of examples where systems provide great technologies but have failed commercially due to insufficient usability. In the design of Bluetooth, a large effort has been put into such matters. For instance, to ensure interoperability between Bluetooth enabled devices from different manufacturers, a quite extensive set of rules cutting through the entire communication protocol stack, have been created for different usage scenarios. These rules are referred to as profiles. Furthermore, a certification procedure is being developed to ensure that Bluetooth equipment really complies to the specification, both for the radio interface and for the different profiles. 2 Technology In this chapter we will give an overview of the technical aspects of the Bluetooth technology. We start with the physical layer and walk through the different layers defined above this. The Bluetooth protocol stack is visualized in Figure 2. The layers L2CAP and below form Bluetooth-specific protocols. L2CAP is a sort of adaptation layer between the Bluetooth radio and standard higher layers (like TCP/IP). However, for specific Bluetooth functions, additional higher layers have been defined like the Service Discovery Protocol, the IrDA interoperability (object exchange protocol over Bluetooth), RFCOMM (serial port emulation over L2CAP), Telephony control protocol, and interoperability requirements for Bluetooth as a WAP bearer. Figure 2 does not reveal all these protocols. Clearly, we can only cover the most essential parts of the Bluetooth system in the given space. The complete specification [1] is obtainable from the URL http://www.bluetooth.com. Figure 1 Synchronisation of laptop and PDA using Bluetooth and the cellular network 65
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Telektronikk Volume 97 No. 1 - 2001
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Per Hjalmar Lehne (42) obtained his
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Stein Svaet (41) is Senior Research
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Pbit/day 6 150 125 100 75 50 25 0 F
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8 Video communication as a utility
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10 The idea of reconfigurable mobil
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12 Switched lobe Dynamically phased
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Figure 2 Needs and Related Services
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