Multimode Communication Protocols Enabling Reconfigurable Radios
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Multimode Communication Protocols Enabling Reconfigurable Radios Lars Berlemann Chair of Communication Networks, RWTH Aachen University, Kopernikusstraße 16, D-52074 Aachen, Germany Email: [email protected]
Ralf Pabst Chair of Communication Networks, RWTH Aachen University, Kopernikusstraße 16, D-52074 Aachen, Germany Email: [email protected]
Bernhard Walke Chair of Communication Networks, RWTH Aachen University, Kopernikusstraße 16, D-52074 Aachen, Germany Email: [email protected] Received 24 September 2004; Revised 21 February 2005 This paper focuses on the realization and application of a generic protocol stack for reconfigurable wireless communication systems. This focus extends the field of software-defined radios which usually concentrates on the physical layer. The generic protocol stack comprises common protocol functionality and behavior which are extended through specific parts of the targeted radio access technology. This paper considers parameterizable modules of basic protocol functions residing in the data link layer of the ISO/OSI model. System-specific functionality of the protocol software is realized through adequate parameterization and composition of the generic modules. The generic protocol stack allows an efficient realization of reconfigurable protocol software and enables a completely reconfigurable wireless communication system. It is a first step from side-by-side realized, preinstalled modes in a terminal towards a dynamic reconfigurable anymode terminal. The presented modules of the generic protocol stack can also be regarded as a toolbox for the accelerated and cost-efficient development of future communication protocols. Keywords and phrases: generic protocol stack, link layer functions, modular layer composition, reconfigurability, softwaredefined radio.
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INTRODUCTION
The radio access of future ubiquitous communication networks will be released from the constrains of cellular wireless networks, as for instance universal mobile telecommunication system (UMTS), or wireless local area networks (WLANs). Wireless mobile broadband systems, providing a patchy coverage in densely populated urban areas, will play an important role. For details on such a fixed and planned relaybased radio network, see [1, 2]. The addressed future wireless network will have to combine several radio access technologies (RATs). Consequently, multimode capable terminals and base stations are required to enable the seamless interworking between these RATs. Multimode architectures can already be found in existing systems, like IEEE 802.16 [3] with different modes of the physical layer (PHY). This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Software-defined radios (SDRs) [4, 5] are a promising approach towards these multimode devices. The recent technological progress allows an extension of the key issues in research of SDRs
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