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Interference management is one of the most important issues in two-tier femtocell networks in which a central macrocell underlaid with several femtocell hotspots. To address the cross-tier and co-tier interference, this paper introduces an energy-efficient power control algorithm via convex pricing scheme, where both circuit and transmit power have been considered. To achieve the target SINR, the...
Femtocell networks, consisting of a conventional macrocell and overlaying femtocells, forming a hierarchical cell structure, constitute an attractive solution to improve the capacity and coverage. However, the inter-tier and intra-tier interferences in such systems can significantly reduce the capacity and cause an unacceptably high level of outage. This paper treats the downlink interference problem...
In this paper, a MOS-driven energy efficient power allocation scheme (MEEPA) is proposed for video transmission over downlink orthogonal frequency division multiple access (OFDMA) networks. In the proposed framework, system power consumption and MOS for users based on end-to-end video distortion have been jointly optimized. We also define a novel energy efficient utility as the unifying metric based...
Power control techniques are becoming increasingly important for a two-tier femtocell network, where a central macrocell underlaid with femtocells, since femtocells may cause serious interference and consume large amounts of energy for large scale application. In this paper, we investigate a distributed energy-efficient power optimization scheme for the uplink transmission of a spectrum-sharing femtocell...
In two-tier femtocell networks, where a central macrocell underlaid with femtocells, femtocells may cause serious interference and consume large amounts of energy for its large-scale application. To solve the problem this paper presents an energy-efficient power optimization for two-tier femtocell networks in the analytical setting of a game theoretic framework, where both circuit and transmission...
In order to suppress cross-tier interference (CTI) and inter-cell interference (ICI) between adjacent macrocells, this paper proposes an effective resource allocation scheme for the two-tier OFDMA femtocell networks, in which macro BSs adopt the soft frequency reuse (SFR) strategy. Consider that macrocell users (MUEs) are prior to femtocell users (FUEs), firstly the subbands are allocated to MUEs...
A major challenge in the two-tier femtocell networks-comprised of a central macrocell underlaid with femtocells is the efficient use of radio resources. Power optimization technique is one important component of radio resource management, since the deployment of femtocells may cause serious cross-tier interference and consume large amounts of energy. This paper presents an energy-efficient power control...
In wireless mobile communication system, energy saving is drawing more and more consideration both from the academia and the standardization communities. In this article, a energy efficient cross-layer resource allocation scheme for multi-cell orthogonal frequency division multiplexing (OFDM) network is proposed, and potential game is explored to guarantee the convergence of utility function with...
An energy-aware data gathering protocol called EADGP that maximizes the network lifetime for wireless sensor networks is proposed in this paper. EADGP introduces a novel distributed hierarchical clustering method. In order to reduce energy consumption and realize load balance, a new cost metric and a metric-mapping function is presented during the cluster head selection phase. Unlike traditional energy-based...
Clustering provides an effective way for data gathering in wireless sensor networks. In practice applications, either the difference of energy consumed by sensor nodes or node redeployment leads to the energy heterogeneous networks. This paper proposes a new distributed Low-Energy node Protection Time-driven Clustering algorithm (LEPTC) for heterogeneous wireless sensor networks, in which nodes are...
It has been demonstrated that clustering is an effective technique to meet the energy constraint problem of wireless sensor networks. Low-energy adaptive clustering hierarchy (LEACH) is a well known cluster-based routing protocol. However, the number of cluster heads produced by LEACH in each round varies in a large range around the optimal value, which shortens the lifetime of the network. In this...
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