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In this paper, we consider the problem of hierarchical bandwidth sharing in cognitive radio (CR) environment. In the system model under consideration, a primary service provider (PSP) can sell its available spectrum bandwidth to a secondary service provider (SSP). In contrast to the conventional schemes, the SUs served by the SSP can also share the unsold bands of the PSP through the approach of opportunistic...
The existing spectrum sharing schemes in cognitive radio have difficulties on guaranteeing the quality of service of secondary system. This paper proposes a risk-estimation based spectrum leasing (RESL) scheme which applies to cellular networks in cognitive radio. In RESL, primary systems are not privileged to take back the spectrum leased unconditionally, and determine whether to lease spectrum according...
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