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.

Signaling of Precoding Granularity for LTE and LTE-A

Abstract: A method for indicating a precoding granularity value. The method includes an access node performing at least one of dynamically signaling the precoding granularity value in downlink control information, semi-statically signaling the precoding granularity value through high-layer signaling, and implicitly signaling the precoding granularity value through a link with at least one parameter that the access node transmits for another purpose.

Cooperative communication technologies for LTE-advanced

Abstract: The LTE-Advanced (LTE-A) system is currently under development to allow for significantly higher spectral efficiency and data throughput than LTE systems. In a wireless system based on orthogonal frequency division multiplexing (OFDM) with frequency reuse factor one such as LTE, the achievable cell spectral efficiency is often limited by the inter-cell interference or coverage shortage of base stations. Hence in LTE-A, coordinated multi-point (CoMP) transmission/reception (a.k.a. multi-cell MIMO or base station cooperation) and relaying technologies are being introduced to clear these major performance hurdles. In this paper, overall picture of cooperative communication technologies being discussed in LTE-A systems including CoMP and relaying is presented, together with considerations on system design.

Toward Optimal Admission Control and Resource Allocation for LTE-A Femtocell Uplink

Abstract: The Third-Generation Partnership Project (3GPP) has incorporated femtocell (FC) technology in the Long-Term Evolution Advanced (LTE-A) standard to enhance the quality of service of indoor mobile users and extend the coverage area of existing macrocells (MCs). In such two-tier LTE-A MC/FC systems, cotier and cross-tier interference exists in cochannel deployment, exerting adverse effects on system performance. In this paper, we study the single-carrier frequency-division multiple-access (SC-FDMA)-based LTE-A FC uplink. We propose the use of transport-layer data admission control (AC) in femto user equipment (FUE) and interference-aware resource allocation (RA) in each base station (BS) to manage the intercell interference (ICI). We first formulate the problem as a constrained Markov decision problem (CMDP) that aims at maximizing the time-average throughput of the entire FC tier subject to the queue stability constraint for each FUE. Then, we propose a joint AC and RA (JACRA) algorithm to obtain the optimal AC and RA policies. In light of the NP-hardness of the RA subproblem, we further propose an iterative heuristic with polynomial time complexity. Simulation studies show that the proposed JACRA algorithm is throughput optimal, outperforming alternative proportional fair (PF) and round robin (RR) scheduling schemes. Moreover, the proposed heuristic achieves near-optimal throughput with substantial improvement in computational complexity.

Quality of service in 3GPP R12 LTE-advanced

Abstract: Growing demand for mobile data traffic is challenging even the capacities of next generation wireless networks. In response, operators worldwide are expanding and updating their deployment. In turn, 3GPP continues to explore ways to empower operators with features for more capable, economic, and energy-efficient networks. Toward 3GPP Release 12, focus has shifted to accommodate the inevitable traffic explosion in both magnitude and traffic types. In this work, we highlight some of the features of LTE-Advanced Release 12 relevant to improving quality of service. Specifically, we focus on solutions explored to enhance network capacity and service delivery in terms of offloading, improved services, and improved congestion control.

Handover in LTE-advanced wireless networks: state of art and survey of decision algorithm

Abstract: The increasing demand for mobile communication calls for improvements to network operating services in terms of capacity, coverage, and Quality of Services (QoS). Ensuring QoS is one of the challenges faced by wireless network operators, which include the provision of high mobility speeds, thus the implementation of a seamless and fast handover between network cells is a prominent issue that must be addressed, especially when fulfilling QoS prerequisites. Long Term Evolution (LTE)/LTE-Advance has met these demands of QoS through the use of a new Radio Access Network and distribution of Radio Resource Management including the handover decision technique to evolve NodeB instead of relying on centralized control. In this paper, we review the control plane structure of LTE/LTE-A and present a comprehensive discussion of handover procedures such as the phases, techniques, requirements, features, and challenges involved. According to the overview of the handover decision phase, we surveyed and classified the present handover decision algorithms for a LTE-A system-based technology in regard to the primary handover decision technique. For each class, we describe in detail the fundamental operations and decision parameters using representative algorithms. A summary of input parameters, techniques, and performance evaluation of the handover decision algorithms concludes this work.