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Device-to-device (D2D) communication is a promising method to reduce power consumption and improve the throughput of cellular networks. However, densely deployed D2D pairs could result in severe interference to cellular users without proper power control. Therefore, the discrete location-aware power control (DLPC) scheme is proposed in uplink D2D underlaid cellular networks. The entire cell area is...
It is significantly important to reduce uplink energy consumption in order to prolong the battery lifetime of user equipment (UE). In this paper, an uplink energy-saving power control scheme is proposed based on Coordinated Multiple Points Reception (CoMP) in the heterogeneous cellular networks. The main idea of the proposed scheme is based on the tradeoff between the uplink transmission power and...
In this paper we study uplink open loop power control (OLPC) optimization for co-channel Heterogenous Network (HetNet) scenarios with macro and pico cells under fractional load conditions. Two methods for automatic OLPC optimization are proposed, motivated and compared against manual approach. It is found that the OLPC parameters at the pico-layer can be computed as a function of the OLPC parameters...
Open Loop Power Control is an important technique providing adaptation of user transmit power. There are multiple factors like cell size, interference conditions, etc. that determine the optimal settings of power control (PC) parameters. In this paper, the impact of open loop PC parameter settings on the performance of LTE uplink (UL) in a co-channel heterogeneous network (HetNet) scenario with macro-...
Heterogeneous deployment is a promising solution to enhance both system capacity and coverage, where the planned macro cell is overlaid with pico cells. However, higher transmit power of macro eNB (MeNB) results in small coverage for pico cell, which causes insufficient offloading from macro cell to pico cell and inefficient cell splitting gain exploration. Cell range expansion (CRE) is one of alternative...
In LTE, uplink (UL) transmit power control is important to mitigate the UL aggregate interference from all femtocells to the macrocell, which is increased as the number of femtocells is increased. We propose an UL power control method for LTE femtocells adaptively setting target received power by using the aggregation of the resource usage of femtocells. With this method, when the aggregate resource...
In this paper a cognitive approach for Long Term Evolution (LTE) Uplink Power Control (UPC) based on Inter-Cell Interference (ICI) limitation is proposed. The goal of such an approach is maximum average cell throughput. The developed method is based on dividing the cell into zones with different uplink power settings based on a self learning neural classifier. The total uplink power for the different...
In this paper the application of Role Game Theory to Power Control (PC) and Inter-Cell Interference Control (ICIC) for Long Term Evolution (LTE) is considered. The authors propose an approach based on defining different roles of the users within a cell of the LTE network. The main idea is to apply different methods and algorithms for PC and ICIC depending on the classified by role subscriber. Such...
Carrier aggregation (CA) has been proposed to aggregate two or more component carriers (CCs) to support a much wider transmission bandwidth for LTE-Advanced systems. With carrier aggregation, it is possible to schedule a user equipment (UE) on multiple component carriers simultaneously. In this paper, we evaluate the performance of uplink CA in LTE-Advanced systems with different CC allocation schemes...
The next generation of cellular networks (Long Term Evolution) uses SC-FDMA (Single Carrier Frequency Division Multiple Access) on the uplink. In SC-FDMA, the uplink resources assigned to a user are called Resource Blocks (RBs) each of which consists of a set of consecutive subcarriers spanning all symbols available for data. Since at most one User Equipment (UE) is assigned to each RB then uplink...
Coordinated multi-point transmission/reception (CoMP) has been considered in 3GPP LTE-Advanced to improve system performance, especially cell edge throughput. The conventional uplink power control (PC) scheme cannot work well since a UE can be served by multiple cells. This paper analyzes uplink PC issues in detail, and proposes an effective scheme aiming to obtain the reception diversity gain from...
Uplink power control in UTRAN Long Term Evolution consists of an open-loop scheme handled by the User Equipment and closed-loop power corrections determined and signaled by the network. In this study the difference in performance between pure open-loop and combined open and closed-loop power control has been analyzed and the different behavior of fractional vs. full path-loss compensation has been...
This paper proposes two interference mitigation strategies that adjust the maximum transmit power of femtocell users to suppress the cross-tier interference at a macrocell base station (BS). The open-loop and the closed-loop control suppress the cross-tier interference less than a fixed threshold and an adaptive threshold based on the noise and interference (NI) level at the macrocell BS, respectively...
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