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.

Standards-compliant LTE and LTE-A uplink power control

Abstract: In LTE and LTE-Advanced uplink, the interference power in a cell depends on the user scheduling and power assignment in neighboring cells. As a result, it is hard to accurately estimate the signal-to-interference-plus-noise ratio (SINR) values and make the right MCS (Modulation and Coding Scheme) selection. To address this challenge, we propose open-loop and closed-loop power control schemes to reduce both the average and the variance of the interference power in order to improve the system performance. It is shown that compared to the existing fractional power control (FPC) in LTE, the proposed schemes improve the cell-average throughput by 7–8% while maintaining the same cell-edge throughput in networks with low penetration loss, and improve the cell-average throughput by 4–6% and the cell-edge throughput by 15–23% in networks with high penetration loss.

Group communication over LTE: a radio access perspective

Abstract: Long Term Evolution, which has its roots in commercial mobile communications, has recently become an influential solution to future public safety communications. To verify the feasibility of LTE for public safety, it is essential to investigate whether an LTE system optimized for one-to-one communications is capable of providing group communication, which is one of the most important service concepts in public safety. In general, a number of first responders for public safety need to form a group for communicating with each other or sharing common data for collaboration on their mission. In this article, we analyze how the current LTE system can support group communication from the aspect of radio access. Based on the requirements for group communication, we validate whether each LTE-enabled radio access method can efficiently support group communication. In addition, we propose a new multicast transmission scheme, called index-coded HARQ. By applying the index coding concept to HARQ operations, we show that the LTE system can provide group communication that is more sophisticated in terms of radio resource efficiency and scalability. We finally evaluate the performance of LTE-enabled group communication using several radio access methods and show how the proposed transmission scheme enhances performance via system-level simulations.

On the Evolution of Coordinated Multi-Point (CoMP) Transmission in LTE-Advanced

Abstract: Inter-cell interference is a serious issue in Long Term Evolution (LTE/LTE-Advanced) system. Coordinated Multi-Point (CoMP) operation has been considered as a powerful technology targeted for LTE-A standard to reduce interference, improve spectrum efficiency, increase data throughput and enhance effective coverage area, in particular for cell-edge users, by exploiting the interference signals from different transmission points. In this context, this paper provides a holistic overview of CoMP operation in LTE-A system. Here, we consider the downlink operation, e.g. CoMP transmission, as it is more convenient to explain the system effectively. The technical operation challenges, advantages and operation complexities of different CoMP schemes, CoMP architectures and CoMP sets are described in details in terms of backhaul traffic, synchronization effect and feedback design. Moreover, this article provides clear evidence of CoMP benefits in terms of throughput gain and compares the results with no-CoMP scenario. In addition, it is intended for a wide range of readers as it covers the topic from basics to advanced aspects.

Fair resource allocation for inband relaying in LTE-Advanced

Abstract: In this work, we investigate the issue of fair resource allocation in relay-enhanced wireless networks. Our focus is on Type-1 relays as proposed for LTE-Advanced. The latter operate as inband relays, i.e., the backhaul and access link must share resources in the time domain. For the case of full buffer traffic on the downstream, we demonstrate how the data flow from the network to the terminals can be arranged in a fair manner. This includes different strategies for resource partitioning at the macro base station, as well as frequency-selective scheduling at both base station and relay nodes.

On the performance of capacity integrated CoMP handover algorithm in LTE-Advanced

Abstract: Coordinated multipoint (CoMP) transmission and reception is the key technique in LTE-Advanced to improve the cell-edge throughput and/or system throughput Joint processing (JP) in CoMP technology provides multiple data transmission points for each user among multiple cooperated radio base stations Handover is one of the key components in cellular network mobility management A handover algorithm is needed for making a handover decision In this paper, a capacity integrated CoMP handover algorithm supporting JP in LTE-A system is proposed Capacity integrated CoMP handover algorithm aims to ensure the radio resources are efficiently used in the system in both capacity and channel quality domains while reducing unnecessary feedbacks Simulation results show that capacity integrated CoMP handover algorithm not only can improve the system throughput but also minimize the system delay, packet loss, and less total number of handovers than open literature CoMP handover algorithm