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The Coverage and Capacity are the essential parameters that defines the performance of a cellular system. But, these are restricted by the interference in the system. The Co-Channel Interference(CCI) is one of the major sources of interference which exists mainly due to the concept of frequency reuse. The effect of CCI is more in CDMA based systems because the frequency reuse ratio is unity in those...
This work deals with 4th Generation Long Term Evolution (LTE) standard for mobile telecommunication. LTE comes with new approaches how to increase speed and stability of wireless data transmission. Planning these networks involves many complex tasks, therefore advanced software tools are needed. The mostly used are Atoll or ASSET. This simulation described in the end of this paper is attempting to...
In LTE cellular networks, the pathloss impacts the performance of the uplink channel power control. Therefore, power control algorithms can achieve good performance on the location where user equipment (UE) is not power limited. The baseline parameter setting of the fractional pathloss power control is valid for some scenarios, however, it is a challenging issue to improve the cell edge throughput...
Recently, a series of approaches have been developed to mitigate the interference and improve the system capacity in LTE networks. However, due to the diversity of data source, existing approaches have their own limitations in supervised and unsupervised learning. To deal with the downlink inter-cell interference which is caused by the frequency reuse and the characteristics of the OFDMA, an interference...
In this study, we describe the behavior of LTE over the sea and investigate the problem of radio resource block allocation in such SINR limited maritime channels. For simulations of such sea environment, we considered a network scenario of Bosphorus Strait in Istanbul, Turkey with different number of ships ferrying between two ports at a given time. After exploiting the network characteristics, we...
The frequency spectrum is an expensive and limited resource while the massive demand of telecommunication services both of data and number of connection continue to raise. The ordinary network becomes denser to meet the growing needs of the services. It can be done by introducing more cells in the network, with lower coverage than the ones that already exist or simply by splitting the existing cell,...
In LTE cellular network, the uplink power control (PC) mechanism consists of two parts, an open loop (OL) PC and a closed loop (CL) PC. The OLPC determines the initial settings of the network while the CLPC settings aim to correct the errors in the OLPC configurations. In most of cellular networks, OLPC is adopted because of its implementation simplicity and low operation cost. In this work, we investigate...
Due to the requirement of high capacity to access broadband service as well as high spectrum efficiency, the frequency reuse of one is targeted to be applied in LTE network planning. But it can lead to a worse inter-cell interference levels experienced especially by users located at the cell edge area. Soft Frequency Reuse (SFR) is considered as an effective frequency reuse scheme for inter-cell interference...
This paper presents the results of measurements of LTE signal for commercial mobile devices on board of a train with the velocity of 80 to 100 km/h along the railway track. This study aims to measure the quality of the cellular LTE coverage from Kelana Jaya to Gombak considering the fact of the growing demand for better quality of service from the subscriber. The measurement is performed by conducting...
Modern frequency division duplex radio frequency transceivers experience transmitter-to-receiver leakage due to the limited isolation of the duplexer. In Long Term Evolution-Advanced (LTE-A) carrier aggregation receivers the coupling between the local oscillators creates harmonics on the chip which can lead to the downconversion of this leakage signal to the receive (Rx) baseband. Thereby, this so-called...
Many LTE-Advanced algorithms and protocols rely on node coordination and cooperation to reduce power consumption, increase spectral efficiency and improve cell-edge performance. Functions such as Coordinated Multi Point, Network Assisted Handover, etc., require a standard connection among nodes to support their operations. The LTE X2 interface meets the above requirements and allows operators to connect...
This paper presents results from the study of co-existence between second generation digital video broadcasting terrestrial-lite (DVB-T2-Lite) and Long-Term Evolution (LTE) downlink networks in a shared radio frequency (RF) band. Partial overlapping coexistence scenarios are considered. A laboratory measurement testbed is used to measure the impact of interfering LTE system on DVB-T2-Lite system....
The frequency reuse mechanism and code division multiple access are not used in LTE networks that leads to simultaneous operating of multiple subscribers (or base stations if we are talking about downlink direction) in the same part of spectrum. It produces the high level of inter-cell interference in both directions. Before making the fine tuning of network parameter settings it is necessary to make...
Ultra-dense network is considered a promising solution for high network capacity. It is favored for its scalability and cost effectiveness. However, when a user equipment (UE) is in a long discontinuous reception cycle and at high speeds, it may suffer from poor mobility performance and high power consumption. While handover algorithms have been widely studied, the impact of mobility measurements...
This paper tackles the capacity optimization problem for Device-to-Device (D2D) coexisting with long term evolution (LTE) cellular system. We firstly derive and analyse the probability density functions of the Signal-to-Interference Ratio (SIR). We show that the capacities of both D2D and LTE are concave and convex respectively w.r.t the transmitted power ratio. To maximize the capacity sum of both...
Cloud-Radio Access Network (C-RAN) is a new emerging technology that holds alluring promises for Mobile network operators regarding capital and operation cost savings. However, many challenges still remain before full commercial deployment of C-RAN solutions. Dynamic resource allocation algorithms are needed to cope with significantly fluctuating traffic loads. Those algorithms must target not only...
Interference coordination while sharing cellular radio resources with Device-to-Device (D2D) pairs needs to be done in the short LTE scheduling period of 1 ms. In this paper, we propose a fast, two-phase auction based, fair and interference aware resource allocation algorithm (TAFIRA) for underlaying D2D communication. TAFIRA can be used to minimize the interference both at the evolved Node B (eNB)...
The potential commercialization of the 5 GHz U-NII bands with unlicensed LTE technologies has sparked considerably debate throughout the wireless industry and beyond. This paper will look at the current state of investigations into the ability of unlicensed LTE technologies to coexist cooperatively with incumbent Wi-Fi implementations and discuss some of the implications involved.
Cell Outage Compensation (COC) is a self-healing functionality in the overall Self-Organizing Networks vision, which is defined by 3GPP. The Operation Administration and Maintenance system triggers the COC for mitigating the outage problem, e.g. out-of-service cell, by providing an adequate level of service to the affected users in the outage cell. We propose an outage compensation algorithm based...
Streaming services come with their own challenges and technical issues that still need to be addressed for satisfying the target quality of experience (QoE) of the end-users in mobile environments. In this paper, we explore the idea of combining users' context information with the packed prefetching process features to enhance users' QoE in heterogeneous networks. More specifically, we propose a scheduling...
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