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Due to the expected exponential growth of traffic volume in 5G-based networks, efficient mechanisms that effectively utilize the underutilized portion of wireless spectrum are needed. Opportunistic spectrum access mechanisms are designed to utilize the available licensed spectrum bands, which can be granted to unlicensed users (secondary users (SUs)) without causing harmful interference to licensed...
Inbound handover (HO) or hand-in is accomplished when the user equipment (UE) performs HO from macrocell (MC) to a small cell (SC) [1] [2]. When the UE connects to a SC with a time of stay (ToS) less than a predefined time threshold, this will result in frequent unnecessary HOs and also increase service interruption which in turn will degrade the end user quality of service (QoS). In this paper, we...
We consider a multi-relay system where the best single relay is selected to assist transmissions. We study the performance bound of the system in the finite blocklength regime. On the one hand, we extend Polyanskiy's finite blocklength model of a single-hop scenario to the considered relaying system and derive the corresponding achievable throughput. On the other hand, by employing a practical coding...
The expanding interest for high-speed cellular networks and data delivery has promoted the advancement in the distribution of the data among users in a productive manner with high throughput. Amongst the most encouraging rising methods for content delivery are opportunistic multicast scheduling schemes. These schemes enhance the system throughput while minimizing the data delivery delay by observing...
In this paper, we study the link scheduling problem considering the fluctuating fading effect in transmissions. We extend the previous deterministic physical interference model to the Rayleigh-fading model that uses the stochastic propagation to address fading effects. Based on this model, we formulate a problem called Fading-Resistant Link Scheduling (Fading-R-LS) problem, which aims to maximize...
In this work, decentralized coordinated scheduling in LTE-Advanced downlink networks is studied, where the base stations abstain from transmitting data on particular frequency/time resources in order to reduce the inter-cell interference experienced by users connected to neighboring base stations. The proposed decentralized scheme is derived with regard to low information exchange between the base...
Offloading users from an overloaded macro base station (BS) to a lightly loaded small cell BS is critical to alleviate the congestion of the macro BSs. However to overcome the signal-to-interference-plus-noise ratio (SINR) degradation of the offloaded users, offloading should be done in conjunction with an efficient interference management technique. Strict fractional frequency reuse (Strict-FFR)...
In this paper, the secrecy performance of full-duplex jamming SWIPT system is conducted where multiple eavesdroppers intercept the confidential information individually. The closed-form expressions of the connection outage probability (COP), the secrecy outage probability (SOP), the reliable-secure probability (RSP) and the secrecy throughput are obtained, which depict the secrecy performance of the...
The default mechanism for a wireless station to select which access point (AP) to associate with is based on the strength of the received signal by the station. This leads to stations associating to the closest AP. In situations where user stations are concentrated around one AP, the default algorithm (DA) results in an unbalanced distribution of station-AP associations. This causes congestion at...
This paper considers queue-driven, real-time interference mitigation aiming to maximize wireless network throughput. A best-response power control algorithm is derived from successive convex approximations, and a single power update is performed at each scheduling interval. In the high-SINR regime, the power control algorithm achieves maximum network throughput. Extending the approach to general SINR...
The individual applications of network coded opportunistic routing and successive interference cancellation have been proven with significant improvement on throughput performance of wireless multi-hop networks, but there lacks practical optimization on their combination application. Based on a TDMA system, this paper models the throughput maximization as network utility function maximization problem...
The individual applications of network coded opportunistic routing and successive interference cancellation have been proven with significant improvement on throughput performance of wireless multi-hop networks, but there lacks practical optimization on their combination application. Based on a TDMA system, this paper models the throughput maximization as network utility function maximization problem...
Achievable information rates are discussed as a tool to analyse and design optical networks. It is shown that the maximum throughput of the network and its dependency of different network parameters can be predicted with such a tool.
As a promising complement to the increasingly congested wireless fidelity (WiFi) system, light fidelity (LiFi) has recently drawn massive attention due to the wide and unregulated visible light spectrum. Also, the light waves cannot penetrate walls which enables interference avoidance between compartments. Meanwhile, LiFi access points (APs) have a much shorter range, relative to WiFi APs. A hybrid...
The use of small, low-altitude Unmanned Aerial Vehicles (UAVs) have been emerging as suitable solutions in the cellular network context to provide radio coverage in disaster recovery regions as well as in hotspot areas. However, when such hotspot groups are in movement, they create a demand for coverage and capacity at locations of their traversal, congesting the nearby ground base stations. In our...
Future 5G mobile networks are expected to support high numbers of simultaneously connected devices and to achieve high system spectrum efficiency at low power consumption. To attain these goals, device-to-device (D2D) communication is a key component. We allow any cellular user equipment to share its radio resource with multiple D2D devices and then develop the MiSo algorithm, which considers spectrum...
In this paper, we analyze the performance of the fractional pilot reuse (FPR) scheme with vertical sectorization in massive multiple-input multiple-output (MIMO) system. In this scheme, users are classified into the cell-center ones in inner vertical sector and the cell-edge ones in outer vertical sector according to their signal-to-interference-plus- noise ratios (SINRs) at the receiver side. Then,...
Capacity-coverage tradeoff balancing is a classical but critical problem for practical wireless multi- cell network optimization. Increasing the average capacity is often at the expense of decreasing the cell coverage and vice versa. It becomes more complex in massive multiple-input/multiple-output (MIMO) networks to balance the above two performance indicators since capacity is much highly improved...
In this paper, we analyze the performance of the fractional pilot reuse (FPR) scheme with pilot contamination mitigation in massive multiple-input multiple-output (MIMO) system. In FPR, users are classified into the cell- center and the cell-edge ones according to their signal-to- interference-plus-noise ratios (SINRs) at the receiver side. Then, the cell- edge users with low SINRs in different cells...
Ultra-dense small cell networks have been proposed as a way of addressing the explosive growth of data traffic. However, this approach often results in empty cells which only end up causing interference instead of serving UEs because they do not have any associated UEs. In this paper, we investigate the empty cell problem using system-level simulation and propose a dual layer on/off strategy for solving...
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