Under the current system of spectrum allocation, spectral bands are allocated for time-scales ranging from years to decades and spatial scales ranging from counties to continents. Robust operation of devices is enabled by the use of guard bands in space and frequency. This paradigm has resulted in vastly underutilized spectrum bands, even in urban locales. However, advances in wireless technolo...

Mobile ad hoc network (MANET) is a infrastructure-less and also a continuously self-configuring network of the mobile devices without having to be connected to any of the fixed physical link. The wide network loads considered for the MANETs are being increasing as the applications evolve. This focuses on the improvement in the bandwidth efficiency, efficient data communication and frequency reu...

Long Term Evolution (LTE) is broadly available to the world. The upcoming trend in LTE-Advanced (LTE-A) emphasizes the enhancement in spectrum efficiency, capacity and cell-edge user throughput and thus highlights the small cell technologies. With the advantage of small size, Femtocell is able to be deployed at "Died zone" and thus satisfying the service expectation particularly to cell-edge us...

Due to discrete reuse cluster sizes, disjoined and uniformed channel assignment, conventional tri-sectored cellular systems have not taken full advantage of antenna directivities. In this paper, we present a novel Channel Alternation and Rotation (CAR) scheme to coordinate channel assignment with antenna directivities. In CAR, cell layout is based on two-tier cell-reuse structure and each cell ...

Is it really true that simulation models and simulation software should always be regarded as candidates for reuse, or is it better to be selective? What are the obstacles to simulation software and model reuse? Can these be surmounted and, if so, at what cost? There is a range of levels at which simulation software may be reused, a range of costs to be borne and range of benefits that may be a...

Two 60 Narrow-Beam Trisector Cell (NBTC) frequency reuse plans, 1x(3+1) and 2x(3+1), that employ Channel Alternation and Rotation (CAR) scheme are presented. In CAR, each cell type is allocated one extra channel set that allows network designer to rotate and alternate channels according to nearest front lobe interference avoidant strategy to enhance co-channel interference ratio (C/I) and allow...

Femtocells have a strong potential for increasing the efficiency, cell coverage and network capacity of next-generation mobile networks. In Long Term Evolution technology, the adaptation of Fractional Frequency Reuse techniques has been proposed in order to overcome the co-channel interference and augment the total throughput of the network. In this work, we propose a Fractional Frequency Reuse...

Proximity based applications are becoming fast growing markets suggesting that Device-to-Device (D2D) communications is becoming an essential part of future mobile data networks. We present three solutions for coordinating the interferences that aim at maximizing the density of D2D links while considering different levels of complexity and available channel state information (CSI). We analyze t...