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In this paper, we investigate the energy efficiency (EE) and spectral efficiency (SE) tradeoff in multi-cell heterogeneous networks (HetNets). Our objective is to maximize both EE and SE of the network while satisfying the rate requirement of users. We use multi-objective optimization techniques to define the objective function. We propose a three-stage algorithm in this paper. First, we select the...
This paper considers power control in energy cooperation enabled heterogeneous networks (HetNets), where each base station (BS) is powered by hybrid energy sources consisting of the conventional power grid and renewable energy sources. Energy can be transferred between BSs with energy loss during the energy transmission process. Transmit power, grid power consumption, and transferred energy are optimized...
Mobile service providers can achieve cost savings by deploying Base Stations (BSs) which harvest renewable energy as they reduce the energy drawn from the grid and its associated cost. The cost savings can be further enhanced by careful management of the system resources. Furthermore, mobile operators require that such resource management be carefully coupled with managing the quality of service (QoS)...
In this paper, we propose an energy-efficient resource allocation scheme for multi-channel multi- cell networks. Our objective is to maximize the network energy efficiency subject to the minimum rate constraints for each user. We take into account both the static and transmit power consumption at base stations. We employ interference pricing and dual decomposition methods. The interference pricing...
We investigate the energy-efficient resource allocation problem for the downlink in long-term evolution heterogeneous networks through maximizing the energy efficiency (EE) under the per-user throughput and per-eNB power constraints in this paper. We demonstrate that EE is an increasing function in channel gain, and that EE is continuously differentiable and strictly quasiconcave in transmit power...
Device-to-device (D2D) communication underlaying a cellular infrastructure has been proposed as a means of facilitating rich local services and offloading the base station traffic. However, D2D communication presents a challenge in radio resource management due to the potential interference it may cause to the cellular network. In this paper, the joint optimization problem of D2D mode selection, modulation...
The objective of our research has been to achieve energy-saving key-value store system. We introduce architecture of our distributed key value store and control framework for energy saving. To reduce power consumption, the control framework should reduce the time required before node power-down. Since this time depends heavily on the amount of data migration, we employ an approach which reduce that...
In wireless multihop network, the inter-hop interference (IHI) is a major factor to deteriorate the end-to-end performances of multihop link. In this paper, we proposed a joint radio resource management with respect to scheduling and power control in order to mitigate the IHI and maximize the resource utilization and the end-to-end rate in the wireless multihop networks. The scheduling algorithm decides...
We present a predictor for real Body-Area-Network (BAN) channels that is accurate for up to 2 seconds, even with a nominal channel coherence time of 500 ms. The predictor utilizes the partial-periodicity of measured BAN channels using the previous 4 seconds of channel gain values. We demonstrate use of this predictor for power control with open-access and private channel measurements. When used under...
Cross-layer resource allocation represents an emerging technology to enable efficient resource management and quality of service (QoS) support for wireless networks. In particular, the rapidly rising energy prices and the increasing power consumption levels in current wireless network constitute a major concern for network operators. In this context, we introduce here a cross-layer approach that allows...
We consider single cell multi-user OFDMA downlink resource allocation on a flat-fading channel such that average supply power is minimized while fulfilling a set of target rates. Available degrees of freedom are transmission power and duration. This paper extends our previous work on power optimal resource allocation in the mobile downlink by detailing the optimal power control strategy investigation...
Energy efficiency is increasingly important for wireless cellular systems due to the limited battery resources of mobile clients. While modern cellular standards emphasize low client battery consumption, existing techniques do not explicitly focus on reducing power that is consumed when a client is actively communicating with the network. Based on high data rate demands of modern multimedia applications,...
We present an effective power reduction scheme for recent mobile devices, e.g., Android devices, which tend to have problems with battery life because some of their applications may be running continuous sensor operations. We propose a context-aware method to determine the minimum set of resources (processor cores and peripherals) that results in meeting a given level of performance. With it, unnecessary...
Cooperative communication improves the QoE of source user by using relay user to retransmit its information to the destination. As a result, the improvement of QoE in source user is at the price of decaying the QoE in relay user. However, the QoE of relay user has been concerned little so far. In this paper, a new power control scheme to improve QoE of relay user in cooperative system has been proposed...
This paper presents a balanced power control scheme for the uplink of cellular MIMO system. The problem of coordinating power consumption reduce with raise in capacity simultaneously is formulated and an efficient algorithm with good performance is derived. Convex optimization method is used to solve the question. In this paper, an adaptive power allocation scheme is proposed by using interior-point...
This paper studies a balanced power allocation scheme to approach the capacity limits and power consumption reduce simultaneously of orthogonal-frequency- division-multiplexing multiple-input multiple-output (OFDM-MIMO) channels under the assumption that perfect channel state information (CSI) is available at both the transmitter and the receiver. In this paper, we build a function to describe the...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
In this paper, we address the issue of transmission power control (TPC) in wireless ad hoc networks. Power control plays an important role in energy saving and network performance enhancement. However, the existing TPC schemes either face the problem of hidden and exposed terminal or have additional hardware requirements. We propose a novel distributed power control protocol, called Receiver Initiated...
In this paper, we propose a cognitive radio-based multi-user resource allocation framework for mobile ad hoc networks using multi-carrier DS CDMA modulation over a frequency-selective fading channel. In particular, given pre-existing communications in the spectrum where the system is operating, in addition to potential narrow-band interference, a channel sensing and estimation mechanism is provided...
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