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.

Impact of machine-type communications on energy and delay performance of random access channel in LTE-advanced

Abstract: Machine-type communications (MTC) are a rapidly growing technology, which is expected to generate significant revenues to mobile network operators. In particular, smart grid is predicted to become one of the key MTC use cases that involves unattended meters autonomously reporting information to a grid infrastructure. With this research, we consider a typical smart metering MTC application scenario in the context of 3GPP LTE-advanced wireless cellular system featuring a large number of devices connecting to the network near-simultaneously. The resulting overload of the random access channel requires a novel evaluation methodology based on comprehensive analysis and simulations. In this paper, we target to complement a validated evaluation framework fully compatible with the 3GPP test cases with a thorough analysis of random access channel performance in overloaded MTC scenarios. We also look at the regular MTC operation, when the devices are sending their data after initial network entry has been performed. By including energy consumption into our methodology together with the conventional performance metrics, we aim at providing a complete and unified insight into MTC device operation, including its energy efficiency. Copyright © 2013 John Wiley & Sons, Ltd.

LTE/LTE-A Network Security Data Collection and Analysis for Security Measurement: A Survey

Abstract: The long-term evolution (LTE)/LTE-advanced (LTE-A) network provides advanced services for billions of users with its higher bandwidths, better spectrum efficiency, and lower latency than legacy cellular networks. But it still suffers from new security threats due to its all IP-based heterogeneous architecture. Therefore, there is a critical need to perform a rapid and accurate network security measurement in the LTE/LTE-A network. To achieve LTE/LTE-A network security measurement, security-relevant data (in short security data) collection and data analysis for attack detection are required as prerequisites. However, most of the existing work only focuses on data collection and analysis for a certain type of LTE/LTE-A attacks. Little work has been done to comprehensively perform data collection and analysis for detecting various attacks on the LTE/LTE-A network. Different from previous work, in this paper, we review the security data collection and data analysis methods in terms of various attacks in order to provide the basis of security measurement in the LTE/LTE-A network. We first present a comprehensive taxonomy of attacks according to the LTE/LTE-A network structure. Then, we propose a number of criteria for evaluating the performance of data collection and analysis methods. And we lay our emphasis on the survey of data collection and analysis methods for significant active attack detection in the LTE/LTE-A network. All the reviewed methods are analyzed and discussed based on the proposed evaluation criteria. Furthermore, current open issues and future research challenges are presented with a view to stimulating future research. Finally, an adaptive data collection and data analysis model for security measurement in the LTE/LTE-A network is proposed.

Coordinated Multiple Points Transmission for LTE-Advanced Systems

Abstract: LTE-Advanced systems which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). Coordinated Multi-Point transmission/reception (CoMP) is one of the candidate techniques for LTE-Advanced systems to increase the average cell throughput and cell edge user throughput in the both uplink and downlink. Although CoMP naturally increases system complexity, it has potentially significant capacity and coverage benefits, making it worth a more detailed consideration. In this paper, we focus on the downlink CoMP-MU-MIMO transmission scheme and present some system level performance evaluation which shows that the CoMP-MU-MIMO transmission scheme can bring significant gains to both the average cell throughput and the cell edge user throughput.

Interference Measurement Methods for Advanced Receiver in LTE/LTE-A

Abstract: A method for receiving a PDCH is provided. The method comprises: receiving, by a UE, information identifying a plurality of resource elements that are transmitted with zero power in a resource block containing the PDCH; receiving, by the UE, a first DMRS on a first DMRS port transmitted from a first cell; and receiving, by the UE, the PDCH that is transmitted on the first DMRS port.