International audienceIn this paper, we consider a game between an Internet Service (access) Provider (ISP) and content provider (CP) on a platform of end-user demand. A price-convex demand-response is motivated based on the delay sensitive applications that are expected to be subjected to the assumed usage-priced priority service over best-effort service. Thus, we are considering a two-sided market with multiclass demand wherein one class (that under consideration herein) is delay-sensitive. Both the Internet and proposed Information Centric Network (ICN, encompassing Content Centric Networking (CCN)) scenarios are considered. For our purposes, the ICN case is basically different in the polarity of the side-payment (from ISP to CP in an ICN) and, more importantly here, in that content caching by the ISP is incentivized. A price-convex demand-response model is extended to account for content caching. The corresponding Nash equilibria are derived and studied numerically
Time-delay estimation is studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. A two-step approach is proposed to obtain accurate time-delay estimates of signals that occupy multiple dispersed bands simultaneously, with significantly lower computational complexity than the optimal maximum likelihood (ML) estimator. In the first step of the proposed approach, an ML estimator is used for each band of the signal in order to estimate the unknown parameters of the signal occupying that band. Then, in the second step, the estimates from the first step are combined in various ways in order to obtain the final time-delay estimate. The combining techniques that are used in the second step are called optimal combining, signal-to-noise ratio (SNR) combining, selection combining, and equal combining. It is shown that the performance of the optimal combining technique gets very close to the Cramer-Rao lower bound at high SNRs. These combining techniques provide various mechanisms for diversity combining for time-delay estimation and extend the concept of diversity in communications systems to the timedelay estimation problem in cognitive radio systems. Simulation results are presented to evaluate the performance of the proposed estimators and to verify the theoretical analysis.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.