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.

Fair resource allocation for the relay backhaul link in LTE-Advanced

Abstract: In this work, we revisit the issue of fair resource allocation in relay-enhanced wireless networks. Our focus this time is on Type-1a relays as proposed for LTE-Advanced. The latter operate as out-band relays, i.e., the backhaul and relay access link use separate carrier frequencies. If carrier aggregation is applied at the macro base station, the backhaul carrier may also contain part of the macro access link. Assuming full buffer traffic on the downstream, we demonstrate how similar resource partitioning strategies at the base station as proposed for in-band relays can be also applied in the out-band case. Furthermore, we propose that for out-band relays, the backhaul link should be considered directly in the regular frequency-selective scheduling process for best performance vs. complexity trade-off. The presented results include the resource consumption and achievable throughput for a hot-spot scenario with 2 out-band relay nodes, as well as a comparison to the in-band case assuming same overall resource budget.

Evaluating Uplink Schedulers in LTE in Mixed Traffic Environments

Abstract: 3GPP's Long Term Evolution is defined by the standardization body's Release 8 and 9, and provides more than a substrate for 3GPP's IMT-Advanced candidate, namely LTE-Advanced, which is due to be defined in Release 10. Both LTE and LTE-Advanced have SC-FDMA in their uplink, a multi-carrier access technique requiring contiguous subcarriers allocations for each UE. No scheduling algorithm, however, is dictated by the standard and several proposals have hence been presented to implemented by vendors. A definite scheduling requirement is the support of QoS attributes of different types of uplink traffic. Our intent in this study is evaluate the connection-level performance of representative scheduling proposals, with focus on QoS aspects. Specifically, we utilize a mixed type of traffic flows and evaluate the schedulers in terms of per-user throughput, delay, packet loss and fairness.

Performance analysis of DRX mechanism considering analogue beamforming in millimeter-wave mobile broadband system

Abstract: To meet the explosive growth of mobile traffic, it is necessary to guarantee high data rate in today's communication system. One of the methods to support high data rate is to use wide bandwidth (spectrum). Due to the limitation of frequency spectrum for the commercial usage, we choose millimeter-Wave (mmW) band of 30GHz and exploit analogue beamforming technique, focusing electro-magnetic wave energy at a certain direction, not an omni-direction. In the analogue beamforming technique, beam selection is required so that base station (BS) and mobile station (MS) communicate with the best beam each other and this procedure is performed periodically for the selected beams not to be mis-aligned. To extend battery lifetime of user equipment, current broadband system such as 3GPP LTE/LTE Advanced adopts discontinuous reception (DRX) which the new mmW system needs too. Therefore, we propose the DRX mechanism considering analogue beamforming technique and analyze the performance of the system varying parameters of beam selection and DRX according to the given beam pattern, traffic model and movement of MS.