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Software defined networking (SDN) decouples control plane functionality from the data plane and performs traffic engineering (TE) through a central SDN controller. Centralized TE is impractical when the network becomes too large in size or in loading. Zone-based hierarchical TE comes into play under this circumstance, where the TE problem is decomposed into sub problems related to zones and tackled...
This paper presents a framework to coordinate the operation of radio nodes for the future fifth generation (5G) mobile wireless networks. Based on software-defined operation, we introduce entities of the control plane and interaction among them in this framework. The framework brings a number of benefits. It adapts radio coordination to network and traffic dynamics, enables flexible, on-demand radio...
We consider central traffic engineering in a software-defined radio access network (SD-RAN) consisting of routers, wireless access nodes, and wired/wireless links. We present a multi-path traffic engineering formulation for downlink transmission considering both backhaul and wireless access constraints. We show large throughput and quality of experience (QoE) gains over traditional single-path transmission...
We consider a cloud-based heterogeneous network of base stations (BSs) connected via a backhaul network of routers and wired/wireless links with limited capacity. The optimal provision of such networks requires proper resource allocation across the radio access links in conjunction with appropriate traffic engineering within the backhaul network. In this paper, we propose an efficient algorithm for...
In this paper, a variable step size adaptive IIR notch filter is proposed to solve the problems of estimating and tracking the frequency of sinusoidal signal polluted by broad band noise. The bias removal technique is employed in the adaptive procedure to reduce the estimation bias in the implementation of the filter, and mathematical analysis is also used to discuss the estimation bias and MSE. Simulation...
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