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In this paper, the ergodic capacity maximization problem in case of coexistence between digital video broadcasting (DVB) and long term evolution (LTE) systems is studied. A full interference scenario, i.e. where the DVB and LTE systems spectrally overlap, is assumed. The objective function, defined as the summation of the LTE and DVB system capacities, is shown to be constituted by a convex and concave...
Relaying is considered in LTE-A networks as a promising solution to increase the capacity and improve the coverage. Resource sharing among different nodes and links and inter-cell interference coordination (ICIC) are challenging issues to obtain a real performance gain linked to relay deployments. This paper focuses on Type 1 half-duplex inband relaying. We propose a dynamic resource allocation (RA)...
High Altitude Platform can provide mobile telecommuncication service to on-ground customers. This paper explains the behaviour of LTE network in a situation, where the service is being provided by HAP and eNodeB in a disaster scenario. In the disaster scenario, a set of adjacent eNodeB in the middle of Bandung city has been disabled. A HAP station has been launched to the disaster location to provide...
Soft frequency reuse (SFR) schemes have been proposed to mitigate the inter-cell interferences (ICI) issue for capacity improvements at cell edge. Nonetheless, the allocation of subcarriers in SFR reduces spectral efficiency in specific cell areas, resulting in the decrease of the system throughput. In this paper, we propose to improve the system throughput by dynamically allocating and exchanging...
With the increase of wireless communication, the possibility to measure Over-the-Air receiver performance under the influence of an interfering signal becomes more and more important. Different devices and base stations are interfering with each other, but interference can also be internally within one device, for example between LTE and Wireless LAN. In this paper, measured results on LTE, WLAN and...
Mobile cellular communications revolutionized in communication system applications. The present mobile cellular communication networks normally often suffer from poor penetration and reception in certain areas, like indoor and apartments in turn decreasing quality of service. The main backbone of Long Term Evolution Advanced (LTE)- mobile network is internet. In order to reduced the traffic and enhance...
This paper presents a characterisation of the energy performance of common and well-known packet schedulers in a multi-cell multi-user UTRAN long-term evolution (LTE) system. First, it was shown that the maximum SINR metric is more energy efficient than the round robin metric for both time and frequency domain packet scheduling. Second, it was shown that frequency domain packet scheduling had a greater...
Curitiba is a city in south Brazil with an estimated population of 1.8 million inhabitants [3]. The teledensity in this city is over 1.2 cellular for each person and, four players, actually are working with Long Term Evolution (LTE) in the city. However, the quality of the LTE cell coverage has not yet reached the standard of the Third Generation Partnership Project (3GPP) group. Considering the growing...
D2D (device-to-device) communications allow the terminals to establish direct connections without the intervention of the BS (base station), when the transmitter and the receiver are in close proximity. Considering the benefits such as spatially reusing licensed spectrum in cellular networks and directly connecting beyond the coverage of BSs, this feature should have fit the LTE (long term evolution)...
This paper evaluates the dynamic behaviour of WiFi and LTE heterogeneous network (HetNet), based on computer simulations. The basic modelling abstraction to describe system operation is described along with the necessary numerical parameters. The focus is on admission control and network reselection in HetNets; two simple but practical algorithms are described and their performance in terms of absolute...
The use of mobile data is rapidly increasing along with the popularity of smartphones and tablets. The use of indoor data, especially, is expected to be further increased. Indoor cell evolved Node Bs (eNBs) are being installed and they are expected to increase the areas overlaid by indoor and outdoor cells to offload indoor mobile data. We confirmed increases in the handover (HO) failure rates from...
It is widely accepted that with the rollout of LTE (Long Term Evolution), multiple 3GPP (3rd Generation Partnership Project) networks including GSM (Global System for Mobile communications) and UMTS (Universal Mobile Telecommunications System) will co-exist with LTE for a long time. Fixed spectrum allocation among multi-RAT (Radio Access Technology) networks cannot make sufficient use of spectrum,...
In LTE-A networks, relaying is a cost-effective solution to improve the capacity and enhance the coverage. However, in order to fully exploit the benefits of relaying, inter-cell interference coordination (ICIC) and resource sharing among different nodes and links need to be addressed. This paper focuses on Type 1 half-duplex inband relaying. Several strategies related to resource partition and frequency...
In this paper we investigate the role of tilt angle adjustment in next generation LTE networks where SIMO receivers and adaptive OFDM/TDMA transmission scheduling may additionally be used to mitigate interference. We present detailed performance measurements when (i) optimal fair tilt angle adjustment is applied in combination with SIMO receivers using Linear Minimum Mean Square Error (LMMSE) detection...
The soft transition between generations of mobile communication systems is a desirable feature for telecommunication operators and device manufacturers. Looking to the past, clock compatibility between WCDMA and LTE allowed manufacturers to build inexpensive multi-standard devices. In this paper it is shown that GFDM, a candidate waveform for the 5G PHY layer, is able to use the LTE master clock and...
LTE (Long-Term Evolution) has become the de-facto standard of the fourth-generation (4G) mobile communications which aim at meeting the demands for high-speed data transmission. However, LTE faces signal attenuation and other problems during transmission. FBSs (Femto Base Stations) provide viable solutions to the problems in indoor and urban areas with poor channel quality. But deployment of FBSs...
With recent traffic explosion, more innovative solutions are required to accommodate user demands. Various studies were done to promote small cells as possible low cost solution to the current capacity problem. Motivated by the capacity crunch problem, we carried out this study on indoor small cell performance using simulation model which mimics real traffic scenario. In this paper we provide an extensive...
Long Term Evolution (LTE) network is the latest technology before the presence of Advanced-LTE (LTE-A). LTE is introduced by 3rd Generation Partnership Project (3GPP) to improve the mobile phone standard to cope with future technology evolutions and needs. Recently, femtocell which known as Home NodeB (HNB) is the remarkable technology network that implanted in the LTE network in order to fulfill...
In Heterogeneous networks (HetNet), low-power Small Cells (SCs) can serve a good portion of the mobile users. These users are likely to have good Signal-to-Interference-plus-Noise-Ratio (SINR) values, which can be exploited to satisfy the expected demand of huge data rates. In this paper, we investigate the effect of introducing higher order modulation, mainly 256QAM, from a link-level perspective...
When the femtocell performs power control in order to reduce the interference level, this may degrade the SNR at the femto-user side if the transmitted power is reduced to large amount. Thus power control is not efficient and other methods such as spectrum splitting among the femtocells is not efficient too and waste recourses. Femtocells must have a new mechanism so that to manage interference and...
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