Yazar "Helmy, Mostafa" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Dynamic utilization of low-Altitude platforms in aerial heterogeneous cellular networks
    (IEEE, 2017) Helmy, Mostafa; Ankaralı, Zekeriyya Esat; Siala, Mohamed; Baykaş, Tunçer; Arslan, Hüseyin
    Aerial telecommunication platforms provide a promising solution to meet surging traffic demands as a component of future communication networks. They can be used as aerial base stations (ABSs) to build an aerial heterogeneous network architecture. In this paper, we consider a scenario where high and low altitude platforms (HAPs & LAPs) collaborate to construct such a network and analyze its performance. Firstly, we determine for each user the probability of being associated with either one of the HAP or LAP. From the association probability, the cell load of ABSs is derived. Secondly, we propose a dynamic placement and sizing algorithm for cells established by LAPs, to achieve load balancing and enhance the QoS for overall users inside the coverage of a HAP. We show, through simulation results, that the algorithm provides considerable gain over static aerial cellular networks.
  • Küçük Resim
    Öğe
    Optimization of aerial base station location in LAP for disaster situations
    (Institute of Electrical and Electronics Engineers, 2015) Helmy, Mostafa; Baykaş, Tuncer; Arslan, Hüseyin
    Aerial telecommunication platforms will be a part of the future communication networks. In this paper, we address the issue of optimizing the location of Aerial Base Stations (ABS) in Low Altitude Platforms (LAP) to minimize the power consumption. We propose a dynamic algorithm which attempts to maximize the received power at ABS by moving it between multiple points within its coverage area. Furthermore, outage probability formula for each user has been derived to measure how much gain this algorithm can offer in line of sight (LOS) and non line of sight (NLOS) cases. Simulation results show that the employment of this algorithm saves more than 10 dB per user in case of Poisson distributed users.
  • Küçük Resim
    Öğe
    Utilization of aerial heterogeneous cellular networks: Signal-to-interference ratio analysis
    (Korean Institute of Communications and Information Sciences (K I C S), 2018) Helmy, Mostafa; Arslan, Hüseyin
    As a component of future communication networks, aerial telecommunication platforms are a promising solution to meet surging traffic demands. These platforms can be used as aerial base stations (ABSs) to build an aerial heterogeneous network architecture. In this study, we explore the promising utilization of high- and low- altitude platforms (HAPs and LAPs) working on the same network as macrocells and femtocells, respectively. First, using stochastic geometry, we determine the probability of each user being associated with either a HAP or a LAP. The association probability is used for deriving the cell load of ABSs. Next, we derive the outage probability of a typical user in a certain tier that is equivalent to the downlink signal-to-interference ratio cumulative distribution function in aerial heterogeneous cellular networks. Moreover, we propose a dynamic placement and sizing algorithm for cells established by LAPs to achieve load balancing and enhance the overall quality of service for users inside the coverage of a HAP. Our simulation results show that the algorithm provides considerable gains over static aerial cellular networks. Furthermore, we derive the coverage probability of a target receiver when the downlink paths are correlated or uncorrelated. The results demonstrate the impact of the difference in elevation angles between HAPs and LAPs on the coverage probability of the target receiver.