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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...
One of the main challenges in Machine Type Communication (MTC) services in the 3GPP LTE networks is to improve device power efficiency for Machine to Machine (M2M) communication. We consider MTC application scenarios which consist of a number of devices connecting to the network concurrently. The methods considered in TR 37.868 involve Disjoint Allocation (DA) and Joint Allocation (JA). The DA scheme...
In seeking to address the problem of prolonged surge of traffic demand, heterogeneous network is now being seen as an attractive method. Heterogeneous network consists of different types and quantities of small cells which can provide a huge amount of data. Simultaneously, those high density deployed small cells consume a large amount of energy that raise another knotty issue. In this paper, we investigate...
In this paper, we consider the use of heterogeneous networks with close integration between the cells, using dual connectivity and fiber optic backhaul. The energy efficiency of such a network is evaluated in comparison with some of the existing traffic offloading mechanisms. We try to enhance the mechanisms taking the system energy efficiency, and user quality of experience based on the offloaded traffic...
We propose a new approach for jointly scheduling deep sleep and allocating pilot and data transmit power in small cells with the aim of minimising energy consumption while maximising user utility within a mixed macro/small cell network. Our approach exploits the relatively predictable nature of traffic load across each day/week and is demonstrated to achieve an average energy reduction of 37%, and...
Cell coverage and network capacity are two major challenges for the evolving 4G cellular wireless communication networks. Hierarchical layering of cells with macro base stations coexisting with low-power base stations in a service area has been investigated as a promising technique for enhancing the coverage extension and reducing the transmit power consumption, which has emerged as a candidate for...
As traditional wireless cellular networks are facing a rapid growth of traffic demand, the future networks may consist of a large number of small cells which are densely deployed. However, a large number of small cell Base Stations (BSs) will consume a lot of energy, which is not conductive to improve the network Energy Efficiency (EE). The purpose of our research is to optimize the dense small cell...
Recently green communications in Heterogeneous Networks has attracted extensive attention. To improve Energy Efficiency (EE) in the premise of maintaining the throughput, we propose an energy-efficient time-power domain resources allocation algorithm. From the aspect of time domain, we propose an adaptive Almost Blank Subframe (ABS) configuration scheme to provide each sector a proper ABS ratio. From...
The energy consumption driven by dramatic growing demand for mobile data rates has attracted extensive attention. It is expected that the next generation cellular communication systems should improve not only spectral efficiency but also energy efficiency. Coordinated multi-point transmission (CoMP) and heterogeneous networks (HetNets) are two techniques for achieving high spectral efficiency and...
Hierarchical layering of cells with macrocells coexisting with low-power small cells has been investigated as a promising technique to enhance coverage extension and reduce power consumption, which has emerged as a candidate for green communications. Due to the challenging interference scenarios, Cell Range Extension (CRE) and enhanced inter-cell interference coordination (eICIC) are the key technologies...
The objective of increasing the Energy Efficiency of communication systems must cope with a sustained growth of the market, a greater penetration of broadband services in everyday life, higher data rate services and a large increase of the number of mobile subscriptions. In this scenario, a particular attention has to be devoted to energy saving strategies that may also contribute to the reduction...
Power-gating is a representative circuit level technique to mitigate leakage power. While in low-power Network-on-Chip (NoC) design, the former fine-grained power-gating methods will decrease network performance due to serial wake-up latency and head-of-line blocking. Therefore, we propose a flexible Virtual Channel (VC) management scheme for fine-grained power-gating to achieve high throughput and...
This paper presents a power-efficient modular wireless platform which has been designed for prototyping and pre-clinical evaluations of neural recording implants. This Kit for Designing Implants (KDI) is separated in function specific modules of 34×34mm which can be assembled as needed. Five modules have been designed and optimized for ultra-low power consumption and a protective casing has been designed...
One of the main purpose for heterogeneous networks (HetNet) is to reduce the power consumption for various spectrum allocation schemes. Large-scale user behavior in a two-tier HetNet is considered for the energy-efficient spectrum allocation, which characterizes the macro BSs that guarantee traffic requirements in non-hotspot regions and micro BSs that guarantee traffic requirements in hotspot regions...
In this paper, we propose a comprehensive analysis of latencies and power consumption of unicast and multicast communication patterns in single-hop duty cycled 6LoWPAN networks. Simulation and testbed experiments are realised under different Radio Duty Cycling (RDC) protocols, channel checking rates and packet fragmentation. The findings of this study confirm, in asynchronous RDCs, the general view...
Wireless LAN multicast is a suitable mechanism for multimedia streaming because of its bandwidth efficiency. However, wireless multicast has several problems in terms of power efficiency. In this study, we analyze the power efficiency of multicast in IEEE 802.11 networks and show that multicast increases the power consumption of clients significantly irrespective of whether the clients join multicast...
This paper presents a new type of heterogeneous network (HetNet) with the intention of achieving both good user throughput performance and lower system power consumption, which cooperatively controls both cell selection offset (CSO) on the cell range expansion (CRE) and the transmission power for pico-eNB (PeNB TP). Average user throughput and the cell edge user throughput are provided as parameters...
Auto white balancing is the process of keeping the color of objects constant automatically under different illumination conditions by calculating a number of parameters from the image data. These parameters are used to change the image pixel values to keep the color constant. This paper discusses the Lam's auto white balance algorithm and presents a novel, high-performance and cost-effective implementation...
Although the LTE systems provides high data-rate, low latency and spectrum flexibility, the coverage holes due to the cell edge and high interference areas are still an open issue. The Heterogeneous Networks (HetNets) can be a possible solution to this problems. The HetNet paradigms overlaps low power base stations (BSs) with different transmitted powers within a macro cellular coverage. However,...
The power consumption in chips, in general, and in crossbars switching fabrics, in particular, grows with the maximum sustainable throughput. Due to the fast increasing traffic demands, the performance scalability of crossbars is severely limited by the capability of cooling the hardware devices. Hence, reducing the power consumption is an important design question to improve the crossbar switching...
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