Abstract
This paper describes some of the challenges that need to be addressed in order to develop collaborative spectrum-sharing systems. The importance of these challenges stems from the assumption that rules for spectrum sharing can change after the deployment of radio networks and that the whole system must be able to adapt to them. To address such a requirement, we used a policy-based approach in which transmissions are controlled by a policy interpreter system, and the policies can be modified during system operation. Our primary goal was to develop a prototype of such a system. In this paper, we outline the implementation of policy interpretation, automatic generation of transmission opportunities in case a request for transmission is denied by the policy reasoner, and the generation of rendezvous channels for the synchronization of otherwise asynchronously running software-defined radios.
Highlights
This paper addresses some of the issues associated with collaborative spectrum sharing
It describes some of the aspects we identified as relevant and important for any implementation of a spectrum sharing system
To address such a requirement, we focused on a policy-based approach, in which transmissions are controlled by a policy interpreter system, while policies are represented in a formal language (OWL)
Summary
A number of definitions of a cognitive radio (CR) have been published in the literature. Another approach is to add a declarative meta-layer of code on top of the imperative code It can be eXtensible Markup Language (XML) code that provides pre-conditions for a policy execution as well as the post-conditions that need to be interpreted and verified by the controller. While this approach is more flexible than the one just described above, it still requires re-coding of the XML-specified testing of the pre-conditions as well as the procedures implementing the post-conditions. There are two kinds of knowledge that needs to be represented using such a formal declarative language: (1) the shared concepts between radios and networks; (2) the policies that are used to control the behavior of the radio. We describe policies that are represented in a language that uses ontological concepts
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