عنوان مقاله
مدیریت نیرو روی فمتوسلهای هم کانال در سیستم های LTE-A
فهرست مطالب
چکیده
مقدمه
مدل و پیکربندی سیستم
ارزیابی و نتایج شبیه سازی
نتیجه گیری
بخشی از مقاله
مدل و پیکربندی سیستم
از آنجایی که فمتوسل ها اغلب توسط کاربر متوسط غیر واجد شرایط آرایش داده شده است، در نتیجه محیط شبیه سازی باید کاربر پسند بوده وبه شیوه ای ساختار یافته ساخته شود که امکان بسط و توسعه آتی آسان را فراهم آورد. ورودی های مورد نیاز به شایستگی کاربر بستگی دارند. نمونه مثال واسط فوق، در شکل 1 نشان داده شده است.
کلمات کلیدی:
Power Management over Co-channel Femtocells in LTE-A Systems Christos Bouras∗†, Georgios Diles† , Vasileios Kokkinos∗†, Andreas Papazois∗† ∗Computer Technology Institute and Press ”Diophantus”, Patras, Greece †Computer Engineering and Informatics Dept., University of Patras, Greece bouras@cti.gr, diles@ceid.upatras.gr, kokkinos@cti.gr, papazois@ceid.upatras.gr Abstract—The use of femtocells has been an attractive solution since it achieves better coverage and capacity and low cost for deployment and maintenance. However, their performance can be compromised by the cross-tier interference with existing macrocell infrastructure or between adjacent femtocells, especially in the case of co-channel deployment. One way to address this, is adjusting the transmit power of every femto base station with respect for overall performance. To this direction, we have implemented a framework that simulates femtocell overlays over LTE-Advanced (LTE-A) macrocellular systems. The framework allows power management over user-defined femtocell deployment, deciding their power levels according to three different power schemes. The resulting throughput is presented for every point of the macrocell in a user-friendly GUI. In this paper, we present the design of this framework and discuss the results. I. INTRODUCTION Femtocells, also referred to as femto or Femto Base Stations (FBSs) or Home Node-Bs (HNBs), are short-range, userdeployed base stations that improve locally the capacity and coverage of the mobile network, while leading to high spectral efficiency. Achieving the latter, though, without creating significant interference to the existing macrocell or adjacent femtocell services is a main challenge of femto technology, especially for co-channel Closed Subscriber Group (CSG) femtocell deployment, the most attractive deployment regarding spectral efficiency. One way to address this, is adjusting the power transmission levels of FBSs, in order to minimize intra-cell and inter-cell interference. A major portion of the existing literature has investigated the interference and power management issues of femtocell deployment. Simulation results of interference impact on downlink and uplink throughputs are presented in [1] and [2], for co-channel femtocells. A power control method is also introduced in [2], that ensures a constant femtocell radius. FBS pilot power is adjusted in [3], based on the number of handover events and the indoor users, while a distributed power management algorithm in [4] uses soft constraints on target Signal to Interference plus Noise Ratio (SINR) values. Regarding simulation tools, open source frameworks in [5] and the Vienna simulators[6] provide solid system level simulations for LTE networks while the work in [7] focus on femtocells.
