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Recently proposed Dynamic Spectrum Leasing (DSL) for Dynamic Spectrum Sharing (DSS) presumes that there is a reward for primary users for accepting secondary activity. The reward primary users received in previous DSL proposals, however, were considered to be proportional to the secondary interference level. In this paper, the authors propose a new way to encourage primary users to lease their spectrum: the secondary users indicate their willingness to spend a portion of their transmit powers to relay the primary signals. Thus, the primary reward is the power saving achieved due to asymmetric cooperation.
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