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.

The Various Angles of Outphasing PAs: Competitiveness of Outphasing in Efficient Linear PA Applications

Abstract: The demand for linear and highly efficient RF amplifiers has continued to rise without showing signs of stopping, as the world looks to the implementation of 5G. Modern communication signals gave rise to the demand, as the desire to efficiently utilize the limited electromagnetic spectrum led to widespread use of amplitude- and phase-modulated signals, e.g., LTE and LTE Advanced, that use carrier aggregation to achieve broader bandwidths. The defense industry may provide even more applications, as electronic warfare techniques make use of multitone and sometimes noise-like signals that have statistics similar to communication signals. Radars are required to limit emissions in adjacent bands, but traditional rectangular pulses have high out-of-band emissions. Gaussian pulse shaping can be used to improve spectral efficiency, limiting emissions and sidelobes, while adding amplitude modulation [1].

Reporting effort for cooperative systems applying interference floor shaping

Abstract: Cooperative multipoint transmission (CoMP) mitigates strong inter cell interference for increased capacity in future networks and is a study item for 3GPP LTE advanced. We presented already the so called partial CoMP framework (pCoMP) as an efficient clustering approach, allowing to serve almost 90% of all user equipment (UE) user centric. We extended this framework to exploit multiple antenna elements at each of the cooperating cells for a powerful interference floor shaping technique, relying on wideband beamformers with variable TX power as well as antenna tilting and a joint precoding on top of that beams. Ray tracing and system level simulations indicate that SINRs of more than 20 dB are possible for a high number of users and in case of full reporting all channel components. Here we analyze the best trade off between more realistic partial reporting and achievable performance, e.g. a signaling overhead reduction of about 30% does not influence the performance significantly.

ARCHON: An ANDSF-assisted energy-efficient vertical handover decision algorithm for the heterogeneous IEEE 802.11/LTE-advanced network

Abstract: To address the challenging issues of energy-efficiency and seamless connectivity in heterogeneous networks, 3GPP and IEEE have recently incorporated several architectural and functional enhancements to the baseline operation of their standards for cellular and wireless local area network access, respectively. Based on the 3GPP Access Network Discovery and Selection Function (ANDSF) and the advanced measurement capabilities provided by the IEEE 802.11-2012 and the 3GPP Long Term Evolution - Advanced (LTE-A) Standards, we propose an ANDSF-assisted energy-efficient vertical handover decision algorithm for the heterogeneous IEEE 802.11-2012 / LTE-A network. The proposed algorithm enables a multi-mode mobile terminal to select and associate with the network point of attachment that minimizes its average overall power consumption and guarantees a minimum supported quality of service for its ongoing connections. System-level simulation is used to evaluate the performance of the proposed algorithm and compare it to that of other competing solutions.

Performance evaluation of coordinated multipoint reception in CRAN under LTE-Advanced uplink

Abstract: Coordinated Multipoint Processing (CoMP) is a promising method to improve cell edge data rate and system spectrum efficiency, which helps LTE-Advanced to meet the high data rate requirement of 4G mobile communication networks. In uplink, coordinated multipoint reception is transparent to user equipment, while significant gain can be achieved with coordination of multiple base stations. CoMP gain can be affected by network deployment, receiver algorithm, channel estimation accuracy and orthogonality of reference signals. In this article, we focuses on uplink CoMP reception in 3GPP long term evolution advanced (LTE-A). Deployment scenarios are introduced in both homogenous networks and heterogeneous networks. Evaluation are taken under system level simulation. Receiver schemes, realistic channel estimation, and impact of reference signals orthognality is taken into consideration. Performance improvement are shown and compared in different CoMP scenarios.

QoS-aware resource allocation for LTE-A systems with carrier aggregation

Abstract: Carrier Aggregation (CA) has emerged as a promising technique for Long-Term Evolution Advanced (LTE-A) wireless communications to satisfy the ever-increasing bandwidth requirements. However, this technical envisagement puts forward new challenges on radio resource allocation such as serious unbalanced loads among different Component Carriers (CCs). To alleviate this problem, a novel QoS-aware resource allocation scheme, termed as Cross-CC User Migration (CUM) scheme, is proposed in this paper to support real-time services, taking into consideration the system throughput, user fairness and QoS constraints. The experiment results show that the proposed scheme outperforms the well-known Two-Level scheduling scheme in terms of packet loss probability, average queue length and throughput per user.