Topic
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.
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Papers
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31 Dec 2012TL;DR: Simulation results show that SSDC- based BCC has a comparable throughput performance with JSDC-based BCC but with a substantially reduced complexity and feedback overhead for 8Tx.
Abstract: In order to achieve a better tradeoff between overhead and performance, this paper proposes a separately selected dual-codebook (SSDC) based best companion cluster (BCC) approach. In this scheme, each UE selects its best and worst longterm precoding matrix indicators (PMI1), and feeds them back as the cluster indicators (CIs) for UE pairing. The final precoder W is determined by two precoders indicated by the best PMI1 and the short-term feedback PMI2. Besides, channel quality indicators (CQIs) are calculated for UE scheduling. To compare with SSDC-based BCC, we also discuss and propose a jointly selected dual-codebook (JSDC) based BCC scheme. Simulation results show that SSDC-based BCC has a comparable throughput performance with JSDC-based BCC but with a substantially reduced complexity and feedback overhead for 8Tx.
13 citations
01 Jan 2010
TL;DR: This PhD thesis focuses on system level analysis of Multi-Component Carrier (CC) management for Long Term Evolution (LTE)-Advanced, where cases where multiple CCs are aggregated to form a larger bandwidth are studied.
Abstract: This PhD thesis focuses on system level analysis of Multi-Component Carrier (CC) management for Long Term Evolution (LTE)-Advanced. Cases where multiple CCs are aggregated to form a larger bandwidth are studied. The analysis is performed for both local area and wide area networks. In local area, Time Division Duplexing (TDD) is chosen as the duplexing mode in this study. The performance with different network time synchronization levels is compared, and it is observed that achieving time synchronization significantly improves the uplink performance without penalizing much of the downlink transmission. Next the technique of frequency reuse is investigated. As compared to reuse-1, using different frequency channels in neighboring cells reduces the interference to offer large performance gain. To avoid the frequency planning, several decentralized algorithms are developed for interference reduction. Compared to the case of reuse-1, they achieve a gain of 50∼500% in cell edge user throughput, with small or no loss in average cell throughput. For the wide area network, effort is devoted to the downlink of LTE-Advanced. Such a system is assumed to be backwards compatible to LTE release 8, i.e., some users can access all CCs (LTE-Advanced users), whereas some are restricted to operate within a single CC (release 8 users). First, load balancing across the multiple CCs is analyzed. Several known approaches are studied and the best one is identified. A cross-CC packet scheduler is afterwards proposed. It improves the cell edge user throughput by up to 90% over the independent scheduling with full buffer transmission and 40% with finite buffer transmission, depending primarily on the ratio of LTE-Advanced users. Meanwhile, there is no loss in the average cell throughput. The channel aware packet scheduling and link adaptation require feedback of Chan-
13 citations
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17 Dec 2010TL;DR: The new ICIC method based on region in OFDM downlink cellular systems has better performance than original one in improving users' throughput and can drastically improve the adjustment accuracy of ICIC.
Abstract: Inter-cell interference coordination (ICIC) is one of the key technologies in the multi-cell radio resource management of mobile systems. It plays a vital role in mitigating strong inter cell interference and guaranteeing proper quality of services for in-progress sessions. Because heterogeneous deployment is adopted in LTE-Advanced, and interference problem becomes serious. In this paper, we propose an ICIC method based on region in OFDM downlink cellular systems. Through dividing the border of cells into several segments, and marking by identities, when serious inter-cell interference occurs, the serving cell transfer the region information with the coordination information. The neighbor cell can judge whether it has exerted interference on the serving cell and perform ICIC action if it is yes. It can drastically improve the adjustment accuracy of ICIC. By simulating our method in the system simulation platform of LTE-Advanced, we can see the new method has better performance than original one in improving users' throughput.
13 citations
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01 Dec 2017TL;DR: This work proposes a scheme which uses software-defined networking architecture and creates a Merkle-Tree for fast authentication and key establishment that can fulfill 5G latency requirements and can reduce communication, computation and energy cost.
Abstract: Use of Heterogeneous networks is essential to achieve the goal of 5G networks. In 5G LTE- Advanced HetNet, latency requirements make secure authentication and key establishment challenging. Dual Connectivity and Coordinated Multi Point are key technologies for LTE-Advanced HetNet. They require performing multiple authentications with low latency. We propose a scheme which uses software-defined networking architecture and creates a Merkle-Tree for fast authentication and key establishment. Furthermore, it can fulfill 5G latency requirements. We present a formal proof of logic correctness and performance analysis with existing schemes. Compared with existing methods our scheme can reduce communication, computation and energy cost.
13 citations
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17 Jun 2014
TL;DR: This paper is a survey upon the evolution of interference mitigation solutions for advanced mobile networks and several similarities between the different schemes are noted and differences on performance impact are highlighted.
Abstract: Since their launching as voice only networks, mobile communication networks have witnessed a perpetual evolution. In the last years, the attention was addressed to high data rate networks. The lately 3GPP released LTE-Advanced network was the first to completely fulfill 4G requirements. However, performance gains remain limited due to severe interference levels. This paper is a survey upon the evolution of interference mitigation solutions for advanced mobile networks. This problem was addressed since earlier releases by coordinating transmission/reception among different cells. Many enhancements were then carried out by each subsequent specification. The originality of this work resides on the comparison between the different schemes and the perspective of developing a new interference coordination method available for 4G and beyond systems with small cells deployment. Several similarities between the different schemes are noted and differences on performance impact are highlighted.
13 citations