Quorum Systems towards an Asynchronous Communication in Cognitive Radio Networks

摘要

This paper reviews quorum systems (QS) fromthe perspective of cognitive radio networks. Quorum systemswere originally developed for and widely used in the scopeof operating systems. Recently, quorum systems have been alsostarted to be applied to wireless communications. The objectiveof this paper is threefold. First, the paper provides survey andguidance on the use of quorum systems. Second,it shows that QS properties provide an interesting alternativetowards an asynchronous communication in cognitive radio adhoc networks (CRANs). Due to properties of quorum systems it ispossible to establish CRANs without employing a common controlchannel (CCC), perfect synchronization, or central controllerarchitecture. QS properties can be efficiently utilized to handlethe rendezvous (RDV) problem in CRANs. New RDV protocolsmust be designed in such a way that there is a guarantee thatall nodes meet periodically within reasonable periods of time. Since pseudorandom solutions do not provide this guarantee,systematic approaches are needed such as QSs. Third, we alsopropose a novel distributed RDV protocol, MtQS-DSrdv, whichis based on mirror torus QS and difference set concepts. Theproposed protocol guarantees RDVs on all available channelswhile CR nodes have the same channel set.