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The LTE network is usually deployed with adjacent cells using the same frequency band, which significantly improves the frequency utilization efficiency. However, the cell-edge users may suffer throughput loss due to severe inter-cell interference (ICI). With the rapid grow of user terminals in LTE networks, ICI levels are rising and ICI becoming the dominant factor of the network capacity. Coordinated...
Different standardization bodies are working towards test methodologies and procedures to determine true Multiple Impute Multiple Output (MIMO) performance. A reference CTIA (Cellular Telecommunications and Internet Association) 2×2 Long Term Evolution (LTE) MIMO antenna concept has been designed [1–2] and verified [3] to eliminate the uncertainties linked to the unknown antenna performance of the...
Long-term evolution (LTE) and multiple input multiple output (MIMO) have earned reputations to be a cutting-edge technology, which can boost significantly wireless communication performances. The paper aims at providing LTE MIMO performances in indoor environments and, therefore, guidelines for network operators can be proposed.
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 increased demand on capacity in cellular networks calls for increased site density and heterogeneous networks. With unchanged mobility pattern this will increase the handover rate, the signaling load and the impact from handover on experienced user quality. An attractive solution to mitigate the handover impact is Combined Cell which combines area splitting gain with seamless mobility. In this...
Video transmission over long term evolution (LTE) networks is studied. The use of distributed antenna systems (DAS) is proposed to enhance the video quality of experience (QoE). Real time video streaming over both the uplink (UL) and downlink (DL) directions is investigated. LTE dynamic resource allocation is taken into account, and several types of DAS deployments are analyzed and compared. Simulation...
This paper presents a novel comparison of different network densification alternatives from the LTE uplink point of view. The comparison is performed for the same environment considering, among other things, an advanced three-dimensional modeling of propagation and user distribution within the traffic hotspots. The obtained results indicate that various types of heterogeneous network deployments are...
For multi-hop transmission two basic relaying modes are available: in-band and out-band. The in-band mode is the main solution considered in most state-of-the-art studies and it is the focus of the 3GPP LTE-Advanced specification. This is because the solution requires only one frequency carrier for relay node operation. However, with evolution of cellular systems, multi-carrier operation is commonly...
This paper presents experiences and results from LTE MIMO throughput measurements of a USB dongle in a reverberation test system. The measurements are performed with the dongle itself and also when it is connected to external diversity antennas with high and low correlation. Three different maximum bit rates are used, 59, 70 and 81 Mbps. The results illustrate that it is possible to separate a good...
Long Term Evolution (LTE) has been introduced by 3GPP (3rd Generation Partnership Project) and is poised to dominate the 4th generation (4G) of mobile telecommunication networks. In this article, we present an in-depth analysis of the LTE physical layer's characteristics and its performance. Our work is unique in providing a detailed performance study based on Release 8 of the 3GPP standard. Several...
This paper discusses the possibilities of using the reverberation chamber as a multipath emulator for testing of wireless terminals, especially those with multi-antenna solutions implemented. The tests are consisting of measurements of data bit throughput, in order to relate the performance of the terminal to an end-user experience. The experimental part includes HSDPA measurements with focus on overall...
The traditional proportional fair scheduling algorithm can only provide users with limited fairness while the channel is changing. To solve this problem and enhance the fairness between users, an adaptive proportional fair scheduling algorithm for LTE (Long term Evolution) system is proposed. It adjusts the scheduling priority according to individual user's channel condition. The proposed algorithm...
The capacity and coverage area of a cell may vary due to changed environment, insertion or deletion of base stations, or malfunctioning base stations, and wrong parameter selection in the network planning phase. Suboptimal capacity and coverage area leads to the waste of network resources and the lower quality. Reacting on the changed situation manually is very expensive and time consuming. Therefore,...
The distributed base station concept is treated in the LTE scenario. Uplink scheduling in LTE systems with distributed base stations is considered. In the proposed model, users are connected to remote radio heads deployed throughout the cell and connected to a central base station. Centralized and distributed scheduling with a distributed base station are compared to centralized scheduling with a...
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