A Joint Algorithm for Base Station Operation and User Association in Heterogeneous Networks

Kim, Seonwook; Choi, Sunghyun; Lee, Byeong Gi

doi:10.1109/lcomm.2013.070113.130730

Cited by 55 publications

(32 citation statements)

References 5 publications

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“…There is a high potential for energy saving if BSs can be switched off according to different traffic loads [11]. To minimize the total cost function, joint user association and BS switching on/off algorithm are designed to balance energy consumption and revenue in HetNets [12]. Reference [13] studied BS closing strategies to maximize EE or minimize total power consumption for downlink multiantenna multicarrier small cell networks supporting best effort traffic.…”

Section: Related Workmentioning

confidence: 99%

“…However, even if we remove constraint (6) and relax (12) to + , the OP1 is still nonconvex owing to the nonconvexity of the objective function (3). We first exploit the structure of (3) to reformulate with generalized fractional programming [24].…”

Section: Problem Transformationmentioning

confidence: 99%

“…The OP3 is obtained by ignoring constraint (6) and relaxing the integrality constraint (12) on and . After relaxing constraint (12), and can be taken as nonnegative real numbers. Note that removing constraint (6) has no effect on the problem, which means that UE can receive radio resources from macrocells and picocells simultaneously in the downlink.…”

Section: Algorithm For Relaxed-rounding Nonlinear Programmentioning

confidence: 99%

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EE-eICIC: Energy-Efficient Optimization of Joint User Association and ABS for eICIC in Heterogeneous Cellular Networks

Zheng

Gao

Wang

et al. 2017

Wireless Communications and Mobile Computing

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The densification and expansion of heterogeneous cellular networks (HetNets) pose new challenges on interference management and reduction of energy consumption. The 3GPP has proposed enhanced intercell interference coordination (eICIC) by making a macrocell silent in almost blank subframes (ABSs) to mitigate interference for low power base stations (BSs) in HetNets. However, energy efficiency (EE) is very crucial for the deployment of a large number of low power nodes as they consume a lot of energy. In this work, we develop a novel EE-eICIC algorithm to determine the amount of ABSs and user equipment (UE) that should associate with picocells or macrocells from energy efficiency perspective. Due to the nonsmooth and mixed combinatorial features of this formulation, we focus on a suboptimal algorithm design. Using generalized fractional programming and the convex programming theory, we propose an iterative and relaxed-rounding algorithm to solve the problem. Numerical results illustrate that the proposed EE-eICIC algorithm achieves superior performance in comparison with state-of-the-art methods in terms of energy efficiency of both system and user.

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Section: Related Workmentioning

confidence: 99%

Section: Problem Transformationmentioning

confidence: 99%

Section: Algorithm For Relaxed-rounding Nonlinear Programmentioning

confidence: 99%

See 1 more Smart Citation

EE-eICIC: Energy-Efficient Optimization of Joint User Association and ABS for eICIC in Heterogeneous Cellular Networks

Zheng

Gao

Wang

et al. 2017

Wireless Communications and Mobile Computing

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“…A small subset of these, instead, propose methods for directly selecting the serving node of a UE, based on cell load and/or channel quality information [15]. Work [18] considers a heterogeneous TDMA network with cellular and Wi-Fi base stations occupying non-interfering spectra, and selects to which infrastructure a UE should connect, so that the cellular operator minimizes the energy cost of its network, while still getting revenue from it. Energy cost reduction is done by switching off cellular eNBs, something that is infeasible at per-AP timescales 3 .…”

Section: Related Workmentioning

confidence: 99%

A Distributed Power-Saving Framework for LTE HetNets Exploiting Almost Blank Subframes

Virdis

Stea

Sabella

et al. 2017

IEEE Trans. on Green Commun. Netw.

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Abstract-Almost Blank Subframes (ABS) have been defined in LTE as a means to coordinate transmissions in heterogeneous networks (HetNets), composed of macro and micro eNodeBs: the macro issues ABS periods, and refrains from transmitting during ABSs, thus creating interference-free subframes for the micros. Micros report their capacity demands to the macro via the X2 interface, and the latter provisions the ABS period accordingly. Existing algorithms for ABS provisioning usually share resources proportionally among HetNet nodes in a long-term perspective (e.g., based on traffic forecast). We argue instead that this mechanism can be exploited to save power in the HetNet: in fact, during ABSs, the macro consumes less power, since it only transmits pilot signals. Dually, the micros may inhibit data transmission themselves in some subframes, and optimally decide when to do this based on knowledge of the ABS period. This allows us to define a power saving framework that works in the short term, modifying the ABS pattern at the fastest possible pace, serving the HetNet traffic at reduced power cost. Our framework is designed using only standard signaling. Simulations show that the algorithm consumes less power than its competitors, especially at low loads, and improves the UE QoS.

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“…Furthermore, a joint algorithm for BS switching-on/off and user association in heterogeneous networks was introduced [18] , in which the algorithm was designed to balance the energy consumption of overall network and the revenue of cellular networks, and the networks consist of both cellular networks using a licensed band and wireless local area networks operating in an unlicensed band. Also, a power-efficient BS operation scheme for green downlink heterogeneous cellular networks has recently been presented, and its performance of the BS operation scheme was compared with those of the previous cell zooming and normal schemes 1) , in terms of the total system throughput and power saving efficiency in the heterogeneous cellular networks [19] .…”

Section: Green Communication Technology For Energymentioning

confidence: 99%

A Novel Power-Efficient BS Operation Scheme for Green Heterogeneous Cellular Networks

Kim¹,

Kim²,

Kang³

2016

The Journal of Korean Institute of Communications and Informati

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BSTRACTPower-efficient base station (BS) operation is one of the important issues in future green cellular networks.Previously well-known BS operation schemes, the cell zooming scheme and the cell wilting and blossoming scheme, require tight cooperation between cells in cellular networks. With the previous schemes, the non-cooperative BSs of a serving cell and neighboring cells could cause coverage holes between the cells, thereby seriously degrading the quality of service as well as the power saving efficiency of the cellular networks.In this paper, we propose a novel power-efficient BS operation scheme for green downlink heterogeneous cellular networks, in which the networks virtually adjust the coverage of a serving macrocell (SM) and neighboring macrocells (NMs) without adjusting the transmission power of the BSs when the SM is lightly loaded, and the networks turn off the BS of the SM when none of active users are associated with the SM. Simulation results show that our proposed scheme significantly improves the power saving efficiency without degrading the quality of service (e.g., system throughput) of a downlink heterogeneous LTE network and outperforms the previous schemes in terms of system throughput and power saving efficiency. In particular, with the proposed scheme, macrocells are able to operate independently without the cooperation of a SM and NMs for green heterogeneous cellular networks.

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A Joint Algorithm for Base Station Operation and User Association in Heterogeneous Networks

Cited by 55 publications

References 5 publications

EE-eICIC: Energy-Efficient Optimization of Joint User Association and ABS for eICIC in Heterogeneous Cellular Networks

EE-eICIC: Energy-Efficient Optimization of Joint User Association and ABS for eICIC in Heterogeneous Cellular Networks

A Distributed Power-Saving Framework for LTE HetNets Exploiting Almost Blank Subframes

A Novel Power-Efficient BS Operation Scheme for Green Heterogeneous Cellular Networks

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