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Understanding the characteristics of spectrum utilization is essential in providing guidelines for resource allocation. In this paper, a detailed measurement analysis of spectrum efficiency is performed, with data collected from tens of thousands of base stations during fifteen months. We examine the characteristics of radio resource margins (RM) extensively, including its temporal skewness, diurnal...
Cognition concept and dynamic spectrum allocation (DSA) technique are applied in cognitive wireless network to increase spectrum utilization efficiency and alleviate network congestion. Due to the dynamic and random characteristic of radio environment in cognitive wireless network, this paper brings forward a dynamic channel allocation mechanism to minimize the probability of collision with the licensed...
Cognitive radio has been proposed as a novel approach for improving the utilization of the limited radio resources by dynamically changing its operating parameters. This paper deals with the problem of channel and power allocation for cognitive radio networks. In particular, we consider the scenario where the transmission of secondary users is controlled by cognitive base station. We propose an autonomic...
This paper discusses the joint session scheduling (JOSCH) problem for multimedia services in heterogeneous wireless networks. The adaptive JOSCH based on layer-encoded streaming is designed for real-time multimedia service simultaneously transmitted by several heterogeneous radio access technologies (RATs). Considering the layered characteristics of the layer-encoded streaming, an adaptive JOSCH mechanism,...
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