LTE Advanced

About: LTE Advanced is a research topic. Over the lifetime, 4055 publications have been published within this topic receiving 74262 citations. The topic is also known as: Long-Term Evolution Advanced & LTE-A.

Capacity analysis of dedicated fixed and mobile relay in LTE-Advanced cellular networks

Abstract: In this paper, the spectrum efficiency for four scenarios: baseline, cell split, fixed relay and dedicated mobile relay on vehicle are analyzed and compared in terms of unified spectrum efficiency bps/Hz/km2. The theoretical expression is derived and the capacity is calculated by numerical integration based on the parameters for 3GPP LTE-Advanced system. The deployment costs for different scenarios are also estimated based on the current real network. This comparison can clearly show the benefit and cost of different solutions, and this is helpful for the strategy making.

A Simulation Framework for Evaluating Interference Mitigation Techniques in Heterogeneous Cellular Environments

Abstract: Femtocells present an attractive solution for the improvement of a mobile network's services providing better data rates and coverage. Since their deployment results to a heterogeneous network where two layers must utilize the available spectrum, issues of interference arise. A method to address this challenge, is investigating the locations of the newly installed FBS, and enforcing a power controlled transmission of all FBSs that achieves optimal and fair overall performance. Another option that becomes available in inter-cell interference cancellation (ICIC) macrocell environments, is utilizing the available spectrum to complete or partly avoid co-channel operation. In this work, we provide a simulation framework that allows the creation of custom, high configurable, user defined topologies of femtocells with power control and frequency allocation capabilities. It allows the investigation of the margin of improvement in interference when these methods are applied and may work as a decision tool for planning and evaluating heterogeneous networks. To showcase the framework's capabilities, we evaluate and study the behaviour of custom deployed femtocells/macrocells networks and examine the cross-tier interference issues. Facilitated by the framework, we enforce and evaluate each interference mitigation technique for different femtocells' deployment densities. Finally, we compare the results of each method in terms of total throughput, spectral efficiency and cell-edge users' performance.

Energy efficient base station maximization switch off scheme for LTE-advanced

Abstract: In this paper, we introduce a solution to a maximization problem for switching off Base Stations in an LTE-Advanced wireless network. Our scheme exploits the existence of idle periods in a cellular network during “night zone”, when the traffic load is low. This work focuses on finding the optimal combination of switched on and off Bases Stations leading to the maximum energy saving. In addition, the major goal lies on increasing the energy efficiency by optimizing the power utilization of the Base Stations without sacrificing the offered Quality of Service. The proposed solution achieves significant energy saving and its performance is evaluated by means of analytical model, as well as simulations results.

Fixed Frequency Reuse for LTE-Advanced Systems in Local Area Scenarios

Abstract: LTE-Advanced systems, which aim to provide high data rate wireless services, have received world-wide researching interests nowadays. In this paper, the performance of fixed frequency reuse with different reuse factors is studied in LTE-Advanced systems. Performance is measured in terms of both average cell throughput and cell edge user throughput. It is found that a properly chosen reuse factor with respect to cell size (which leads to different level of inter-cell interference), can offer up to 30% gain in average cell throughput and much higher gain for cell-edge user throughput in Local Area (LA). This high gain from frequency reuse makes it attractive for future LTE-Advanced systems.

Massive carrier aggregation in LTE-advanced pro: impact on uplink control information and corresponding enhancements

Abstract: 3GPP began standardization of carrier aggregation (CA) in LTE-A Rel. 10 to combine up to five component carriers (CCs) for facilitating wider transmission bandwidth of 100 MHz. Further enhancements followed in Rel. 11 and Rel. 12 to enable features such as aggregation of carriers between time-division duplex (TDD) and frequency-division duplex (FDD) frame structures. In LTE-A Pro Rel. 13, massive CA enhancements were defined to combine more than five CCs with the initial focus on the downlink. While the benefits of CA have been evident, operating an even larger number of downlink carriers results in increased overhead on the uplink as there is a need to send the combined control information for all the CCs. In this article we give an overview of the standardized enhancements, their impact on uplink control information overhead and its transmission, new control channel formats and their link level investigation in 3GPP-defined simulation assumptions.