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We consider the admission control of small cell access points (SAPs) supported by wireless backhaul in a heterogeneous network. The SAP admission control in wireless backhaul is performed at the wireless backhaul hub (WBH), which aims to serve as many SAPs as possible with the guaranteed data rates. Such a problem involves joint design of transmit beamformers, power control, and selection of SAPs,...
Recent advancements in the self-interference (SI) cancellation capability of low-power wireless devices pave the way of implementing full-duplex (FD) self-backhauling in smallcell networks. FD self-backhauling allows exploiting the radio spectrum used by the radio access network (RAN) for backhaul links as well as access links concurrently. This paper characterizes the performance of FD self-backhauling...
While small cells (SCs) are an important feature of emerging network architectures, providing backhaul to SCs is a challenging problem. Non-line-of-sight (NLOS) wireless backhaul networks provide a cost effective approach in urban areas where providing a wired- or fiber-based backhaul is difficult. An important problem in designing such networks is to optimize the position of backhaul hubs in a way...
Heterogeneous networks are considered a promising solution to address the explosive increase in wireless networks capacity demand. Due to their limited coverage, small cells offer better area spectral efficiency than macro-cells, and advanced features, such as cell range extension, aim at biasing the choice of users towards small cells. Whereas these features are designed to maximise the air interface...
In this work, we develop an analytical paradigm to analyze the average symbol error probability (ASEP) performance of uplink traffic in a multi-tier cellular network. The analysis is based on the recently developed Equivalent-in-Distribution approach that utilizes stochastic geometric tools to account for the network geometry in the performance characterization. Different from the other stochastic...
To achieve higher spectral efficiency in future wireless networks, small cells have been conceived to be deployed over conventional macrocell networks, generating heterogeneous networks (HetNets). However, interference between different tiers of HetNets is the main bottleneck for high spectral efficiency. Spectrum access, including spectrum deployment and channel access, is one of the most powerful...
Hybrid division duplex (HDD) can be a key technology for new Heterogeneous Network (HetNet) architectures based on two-tier frequency division duplex (FDD) macro-cell and time division duplex (TDD) femtocell deployments. We propose coordinated interference management techniques that work in the presence of uplink power control in HDD to further enhance network performance. The proposed mechanisms...
An ultra-dense deployment of small cells with multi-antenna nodes is expected to be the solution for coping with the huge traffic growth expected in near future. Mutual interference among coexisting users is one of the main performance bottlenecks in such dense deployment scenarios. A distributed transmission technique that can efficiently manage the interference in an uncoordinated dense small cell...
This paper analyzes two-tier heterogeneous cellular network with decoupled downlink and uplink access. The basic performance benefits of uplink/downlink decoupling have been recently introduced. Here we provide a more elaborate treatment of the decoupling mechanism by analyzing spectral and energy efficiency of the system, as the joint improvement of these two features is crucial for the upcoming...
Femtocells have emerged as a promising solution for increasing network capacity to cope with the exponential growth of mobile video traffic. However, the randomness of wireless channel and cross-tier interference may cause frequent interruption or fluctuation of video playback, which is challenging for wireless video streaming. In this paper, we consider a femtocell scalable video streaming system...
We study distributed interference networks in which the transmitting-receiving pairs (or users) can communicate over several orthogonal channels. The network is said to be decisionwise distributed because each transmitter is assumed to choose the way it spreads its power over the available channels to maximize its individual rate. The main contribution of this paper is to prove that, depending on...
Ultra dense indoor deployment is widely recognized as one of the predominant network configurations of the future wireless systems. Dense indoor deployments are characterized by severe interference between co-channel access points deployed usually in close proximity of one another. Thus the effectiveness and efficiency of interference management techniques is the key to the success of ultra dense...
This work demonstrates the distributed joint selfoptimization of power and decoding order, to alleviate uplink intercell interference in a heterogeneous network, with signal to interference ratio constraints. This problem can be formulated as a potential game of coupled action space among the basestations. However, best response dynamics of this game require global channel knowledge at all cells....
We consider a 5G small cell model where the cells are deployed in a way to cover users in the neighbor cells in order to introduce cell active-sleep control, so-called inter-cell power management (IPM). Using a Markov decision process (MDP), one can obtain an optimal policy for IPM, but with limited scalability. This paper proposes a modular IPM strategy which is a suboptimal policy to group only...
This paper develops a model evaluating the impact of mobility in heterogeneous wireless networks by the way of analytical expressions of the spatio-temporal evolution of QoS indicators. Such formulas are obtained by introducing a multiuser averaged mobility pattern named density of users. Among the set of densities, we use a Gaussian form of this quantity, which results from a modeling method based...
This paper introduces a novel bi-directional signaling scheme for decentralized beamformer design to maximize the weighted sum rate (WSR) of multi-cell multi-user multiple-input multiple-output dynamic time division duplexing (TDD) system. In particular, the base stations are assumed to be either in uplink or downlink state based on the instantaneous traffic demand. The WSR maximization problem is...
Coordination is foreseen to be an important component of future mobile radio networks. It is especially relevant in heterogeneous networks, where high power base stations produce strong interference to an underlying layer of low power base stations. This work investigates the impact of the interference from base stations which are not part of the cooperation. This interference is called out of cluster...
Full duplex heterogeneous networks are considered as a mean of boosting the performance of future wireless communication networks. In this paper, we study full duplex orthogonal division multiple access (OFDMA) heterogeneous network. In our model, each node will operate either in full duplex or half duplex multiuser MIMO. In addition, each user will attempt to connect to the macro base station or...
Device-to-device (D2D) communication is under active investigation and may be a key feature in 5G networks for its great potential in improving network spectral and energy efficiency. Underlaying proximity-based D2D communication links in current cellular networks allows D2D users to opportunistically access the cellular spectrum, thus causing interference not only in the D2D tier but also between...
In this paper, we consider a dynamic system composed of several Wireless Body Area Networks (WBANs) interacting with the surrounding environment, forming Body-to-Body Networks (BBNs). In this dynamic BBN system, we analyze the joint mutual and cross-technology interference problem due to the utilization of a limited number of channels by different transmission technologies (i.e., ZigBee and WiFi)...
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