First IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 2005. DySPAN 2005.
DOI: 10.1109/dyspan.2005.1542642 View full text |Buy / Rent full text
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Abstract: Device coordination in open spectrum systems is a challenging problem, particularly since users experience varying spectrum availability over time and location. We propose a distributed coordination approach that handles spectrum heterogeneity without relying on the existence of a preassigned common control channel. Our approach carries potential to provide robust operation under network dynamics. While this approach can be implemented by upgrading the legacy protocol stack without modifying the MAC protocol, … Show more

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“…When sensor nodes rely on their own spectrum sensing observation only, they may not be able to detect the appearance of primary users (PUs) due to shadowing. Achieving sensing in a distributed approach is known as cooperative sensing [26]. However, in CR-VASNET, the nodes share their spectrum sensing and decision result with the nodes in their vicinity.…”
Section: Cr-vasnet Architecturementioning
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“…When sensor nodes rely on their own spectrum sensing observation only, they may not be able to detect the appearance of primary users (PUs) due to shadowing. Achieving sensing in a distributed approach is known as cooperative sensing [26]. However, in CR-VASNET, the nodes share their spectrum sensing and decision result with the nodes in their vicinity.…”
Section: Cr-vasnet Architecturementioning
“…The elected channels may switch in response to the changes in link conditions dynamically. RSS nodes are aware of their location initially; however, VNs compute their location based on localization algorithm which we proposed in [27]. In addition, the sender and receiver share several common hash functions with location and time as the input key.…”
Section: Cr-vasnet Architecturementioning
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“…Due to this spectrum heterogeneity, very rarely can a channel commonly available to all SUs at a particular instance be found. To account for PU dynamics and spectrum heterogeneity issues, several researchers have proposed cluster-based approaches for control channel design of CRAHNs [5][6][7][8]. In cluster-based control channel schemes for CRAHNs, a neighbor discovery (rendezvous) process is performed to set up an initial network topology.…”
Section: Introductionmentioning