Petri Net Based Controller Concept For Cognitive Radios in Wireless Access Networks

Abstract

<p class="MsoNormal" style="text-align: left; margin: 0cm 0cm 0pt;" align="left"><span class="text"><span style="font-family: ";Arial";,";sans-serif";; font-size: 9pt;">This paper will give a detailed discussion about the authors view on Software Defined and Cognitive Radio. After an introduction on different aspects of software radio and a novel approach on cognitive radio is presented. As proof of concept a software defined cognitive radio demonstrator termed Falcon was built up which is described afterwards. The Falcon is entirely based on a modular signal processing concept. In particular, the receiver deploys modules which process and generate log-likelihood ratio (LLR) signals, hence, providing the capability of a plug-and-play-type reconfigurability. To the best knowledge of the authors, such a reconfigurability approach has not yet been pursued as consequently before.</span></span><span style="font-family: ";Arial";,";sans-serif";; font-size: 9pt;"></span></p&gt

A Platform Approach to the Design of Terminals and Infrastructure Components for Cognitive Wireless Networks

“…The way of reconfiguring the terminal, in particular the realization of a processor with master controller and a Petri net based approach, which allows concurrent mode of operation, high reliability and secure applications, seems to be a pragmatic and yet rather novel approach towards the practical implementation of a cognitive wireless device [7]. The approach towards reconfiguration introduced by the authors consists of a master controller which is responsible for a reliable reconfiguration.…”

“…the updating of communication software must be considered [7]. In addition, the adaptation of robust protocols, starting with frequency scanning and simultaneous operation of several wireless communications systems and applications, has to be included in the design process: It is hence a reasonable consequence to found the aforementioned platform concepts on SDR (Software Defined Radio) and CR (Cognitive Radio).…”

“…The implementation and validation of the master controller based concept on a PCB (Printed Circuit Board) level integration will be done by setting out from currently used demonstrator platforms. The reader is referred to [7] for further information on this reconfiguration approach. In order to develop cognitive wireless terminals and infrastructure components, the requirements on the reconfigurability and cognitive modes of operation, discussed in Sect.…”

Cognitive Radio Prototyping

“…e.g. [6], [7]. In this paper, we will present a HW/SW platform which can serve as a promising basis for the realization of cognitive radio devices.…”

“…URANUS CONCEPT VALIDATION FLOW The URANUS validation platform design flow in the form of a Petri net [11]- [13] is shown in Figure 2. Three main situations in which URANUS technology might introduce significant advantages were identified by the project, namely, * the intersystem hand over, since the QoS (Quality of Service) experienced by the user at this point is going to be directly related with the time spent in air interface reconfiguration, * the multimode operation, in which simultaneously reception / transmission with different air interface modes are operating, simultaneously, and * user defined modes, in which the flexibility of the air interface will allow to adapt it to the real electromagnetic environment.…”