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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Anifantis, E. Karyotis, V. Papavassiliou, S. |
| Copyright Year | 2011 |
| Description | Author affiliation: Institute of Communication & Computer Systems (ICCS), School of Electrical & Computer Engineering, National Technical University of Athens (NTUA), Athens, Zografou, 15780, Greece (Anifantis, E.; Karyotis, V.; Papavassiliou, S.) |
| Abstract | Secondary ad hoc users of Cognitive Radio networks experience constant fluctuations of their link quality due to dynamic traffic behavior of their primary network counterparts. Several cognitive-aware MAC and routing protocols have been proposed in order to counterfeit properly such spectrum variations. In this paper, we introduce a vertical time-based control mechanism in the traditional protocol stack, aiming at properly balancing the inherent trade-off between instant local adaptations at MAC layer, against slower, but more globally aware rerouting reaction mechanisms. Based on localized and independent node decisions, an optimal feedback policy is proposed in order to exploit the most appropriate protocol layer in each case and provide per link channel assignments, such that flow rate requirements are satisfied with the least cost. We use Markov theory to examine the coexistence of primary and secondary networks, while the optimal decision policy is derived via a Markov Decision Process (MDP) and linear programming. Analysis and simulations are used for performance evaluation and together they confirm that the proposed time-based cross-layer feedback strategy contributes to higher network performance regarding flow rate requirements, sensing and rerouting costs. |
| Starting Page | 1044 |
| Ending Page | 1049 |
| File Size | 237607 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781457706806 |
| ISSN | 15301346 |
| e-ISBN | 9781457706813 |
| e-ISBN | 9781457706783 |
| DOI | 10.1109/ISCC.2011.5983980 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-06-28 |
| Publisher Place | Greece |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Markov processes Sensors Routing Media Access Protocol Routing protocols Engines Markov Decision Processes (MDP) Cognitive Radio Networks (CRNs) Spectrum variations Cross-layer control mechanisms |
| Content Type | Text |
| Resource Type | Article |
| Subject | Signal Processing Mathematics Computer Networks and Communications Computer Science Applications Software |
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