Network planning and design

About: Network planning and design is a research topic. Over the lifetime, 12393 publications have been published within this topic receiving 229776 citations. The topic is also known as: network design.

Cognitive Interference Management for LTE-A Femtocells with Distributed Carrier Selection

Abstract: The concept of small cells such as femtocells has been regarded as a promising solution to overcome the indoor coverage problem and deal with the growth of traffic within macrocells. However, the unpredictable deployment pattern of such cells makes centralized network planning impractical and requires more efficient interference management and distributed spectrum planning schemes to realize the benefit of femtocells. In this paper, we propose a cognitive-based interference management solution for LTE-Advanced (LTE-A) femtocells by sharing measured pathloss information among neighbors and selecting component carriers according to the estimated mutual interference. System-level simulation results demonstrate that the proposed scheme can effectively avoid spectrum collision and significantly improve overall network capacity.

Practical Least pth Optimization of Networks

Abstract: A new and practical approach to computer-aided design optimization is presented. Central to the process is the application of least pth approximation using extremely large values of p, typically 1000 to 1 000 000. It is shown how suitable and reasonably well conditioned objective functions can be formulated, giving particular emphasis to more general approximation problems as, for example, in filter design. It is demonstrated how easily and efficiently extremely near minimax results can be achieved on a discrete set of sample points. Highly efficient gradient methods can be employed and, in network design problems, the use of the adjoint network approach for evaluating gradients results in greater savings in computer effort. A comparison between the Fletcher-Powell method and the more recent Fletcher method is made on the application of least pth approximation, using a range of values of p up to 1 000 000 000 000 on transmission-line transformer problems for which optimal minimax solutions are known. This is followed by filter design examples subject to certain constraints.

A Facility Location Model for Bidirectional Flows

Abstract: Recent research on reverse logistics and closed-loop supply chains has produced a number of specialized network design models. We develop three generic facility location models for the integrated distribution and collection of products that accommodate a variety of applications and industries. These models quantify the value of integrated decision making in the design of forward and reverse logistics networks throughout different stages of a product's life cycle. The formulations extend the uncapacitated fixed-charge location model to include the location of used product collection centers and the assignment of product return flows to these centers. In addition, we develop a Lagrangian relaxation-based solution algorithm that is both quick and effective. We measure the implications of integrated decision making by comparing the total facility and transportation costs of our joint optimization models with the cost of solutions in which forward and reverse facility location decisions are made sequentially or independently of one another. In addition, we discuss the implications of integrated decision making on network configuration and introduce a new network similarity measure to quantify this analysis. Computational results are also presented.