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Deployment of low power base-stations (referred to as HetNet) within cellular systems can improve system capacity, coverage and enhance users experience. However, the inter-tier and intra-tier interference in such systems can significantly impact overall system performance, which makes interference and spectral resource management more complex. To build, operate HetNet networks, mobile operators have...
Software Defined Networking has been adopted to improve data center network efficiency. In SDN, the controllers are responsible for exchanging information with the switches to perform specific operations such as data forwarding. The transmission of control traffic usually uses networks different from data networks. However, building an additional wired network for the control traffic leads to high...
In this paper, a joint control method for the user association and almost blank sub-frame (ABSF) based interference coordination (IC) technique in heterogeneous cellular networks is proposed. The optimization objective is simultaneously improving system throughput and guaranteeing proportionally fairness. Usually, user and base station (UE-BS) association is performed before ABSF rate determination,...
In this paper, we focus on a beam pattern diversity of user terminals in order to improve the network-wide performance along with an inter-cell interference coordination (ICIC). Previous ICIC works mainly focused on conventional single antenna user terminals, and thus further improvement may be possible by employing the opportunistic scheduling to exploit multi-user and beam pattern diversity. Therefore,...
Opportunistic schedulers such as MaxRate and Proportional Fair are known for trading off between throughput and fairness of users in cellular networks. In this paper, we propose a novel solution that integrates opportunistic scheduling design principles and cooperative D2D communication capabilities in order to maximize fairness without sacrificing throughput. Specifically, we develop a mathematical...
LTE-A addresses the challenges of coverage block holes and increase in user density with new features, such as small cell and femto cell. Small cell can be an inexpensive substitute to macro cell in coverage depleted areas. In contrast, heterogeneous network using femto cells with its ubiquitous coverage, can deliver high-speed data. Resource scheduling algorithm has an important role in determining...
Heterogeneous cloud radio access networks (H-CRAN), which combines the benefits of cloud radio access radio networks (C-RAN) and heterogeneous networks (HetNets), is an emerging technology to achieve high data transmission rates in 5G cellular networks. In H-CRAN, to mitigate interference among macro BSs (known as high-power nodes (HPNs)) and remote radio heads (known as low-power nodes (LPNs)), Fractional...
Inter-Cell Interference (ICI) is always a key problem in Fractional Frequency Reuse (FFR) system to be focused on, which should be well resolved to pursue higher throughput and better power efficiency. In this paper, we investigate throughput and power efficiency of RR scheduling in FFR system by both closed-form expression and Monte Carlo trials method. We improve a previous throughput model by applying...
Cloud Radio Access Networks (C-RAN) promise to leverage cloud computing capabilities for enhancing the quality and coverage of next generation 5G networks. 5G networks shall witness an increasing density of users and access points, very small latencies, more bandwidth resources, and the use of virtualized hardware for baseband processing. Within such an environment, the problem of scheduling the network...
To support the tremendously increasing data traffic volume in cellular networks, novel network architectures are getting evolved. Heterogeneous Network (HetNet) architecture is one such approach, where the serving nodes belonging to different Radio Access Technologies (RATs) coexist with the existing macro cell network, as an overlay. To leverage the full capacity of HetNet, efficient traffic handling...
Wireless communications are currently undergoing very rapid development, and as a result, the demand for wireless spectrum has been growing dramatically. In this regard, future wireless solutions have to meet multiple needs in terms of spectrum efficiency (SE). Both 5G, the next generation of mobile networks, and Cognitive Radio (CR) came as promising new technologies dealing with those requirements...
Long Term Evolution (LTE) packet scheduler is a key mechanism in the LTE traffic handling. It is mainly in charge of allocating physical resource blocks for the attached UEs. The main problem in LTE scheduler is to maximize the throughput while maintaining the fairness. The performance of scheduler is very critical, especially when many UEs are located at the cell edge. The new proposed scheduler...
Considering the uplink power control scheme worked effectively in compensating the path loss of intra-cell users, mitigating inter-cell interference and improving the cell coverage and system throughput in LTE-A system. An optimization physical uplink shared channel (PUSCH) closed loop power control algorithm based on power headroom report (PHR) is proposed in this paper for the existing ones with...
With the rising of smart devices and data-intensive service, more and more people have been dedicated to the study of a novel network architecture and communication solution. As 5G revolutionizes how humans acquire, manage and engage with information, this trend will accelerate. To meet this evolution, a novel admission control strategy in LTE-A and WLAN integrated network is proposed in this paper...
Mobile Radio Communications Systems have retained engineers' attention, research and commerce communities long time ago. In order to certify both Signal Processing and Radio Communications discipline developments, novel systems design are continuously introduced. This is obtained after long, correct and accurate test procedures which begin over multiple tests usually done over a simulation procedure...
In heterogeneous cellular networks (HCNs), it is highly desirable to design a cell association strategy that can actively offload mobile users to less congested small cells. Such a cell association strategy needs to be considered in conjunction with resource allocation. In this paper we take an optimization approach to analyze joint cell association and resource allocation in a two tier HCN. We formulize...
In the next few years, small cells (SCs) are expected to be densely deployed to achieve sustainable capacity enhancement. Due to the high SC density, some SCs will not have a direct connection to the core network, and thus will forward their traffic to their neighboring SCs through a multi-hop backhaul (BH). In such multi-hop architectures, the user association problem becomes challenging with BH...
Coordinated Multipoint (CoMP) is a new technique introduced in Long Term Evolution-Advanced (LTE-A) to address the inter-cell interference especially the one experienced by cell-edge user. It may also improve the overall capacity of the network. When a user approaches the cell edge, CoMP will be implemented and a CoMP set of multiple eNodeBs will be formed to start packet transmission in a coordinated...
This article compares the potential performance gains from downlink scheduling and interference mitigation in an LTE-Advanced dense small cell network. The study combines theoretical considerations and system-level simulations with a dynamic traffic model and different offered loads. It is shown that intra-cell scheduling can provide a 22% throughput gain in a narrow traffic load region, while the...
As traditional wireless cellular networks are facing a rapid growth of traffic demand, future networks may consist of a large number of small cells which are densely deployed. However, networks in dense environment is exposed to strong inter-cell interference problem which is critical to networks capacity. To solve the problem, we use the Graph Coloring Algorithm (GCA) to divide the small cells into...
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