Energy-aware deployment of dense heterogeneous cellular networks with QoS constraints

Cui, Qimei; Cui, Zhiyan; Zheng, Wei; Jäntti, Riku; Xie, Weixin

doi:10.1007/s11432-016-0249-9

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…In HetNets, lots of low-cost and low-power small-base stations (SBSs) are densely deployed to provide high-data-rate services [7]. These SBSs can help offload the data traffic from macro-base stations (MBSs) and thus relieve traffic congestion problems and improve the spectral efficiency (SE) of cellular networks.…”

Section: Introductionmentioning

confidence: 99%

Joint Power Allocation and User Scheduling for Device-to-Device-Enabled Heterogeneous Networks With Non-Orthogonal Multiple Access

Liu

Xiao

et al. 2019

IEEE Access

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Device-to-device (D2D) communications-enabled dense heterogeneous networks (HetNets) with non-orthogonal multiple access (NOMA) are promising solutions to meet the high-throughput requirement and support massive connectivity. In this paper, we propose a novel framework on the D2D-enabled HetNets with NOMA, where small cells underlay the uplink spectrum of macrocells to make full use of spectrum resources, NOMA technique is invoked to serve more downlink users simultaneously, and D2Denabled multi-hop transmission is established to enhance signal reception of the far users (FUs) on cell edge. We investigate joint power allocation and user scheduling to maximize the ergodic sum rate of the near users (NUs) in the small cells while guaranteeing the quality-of-service requirements of the FUs and the macro-cell users. The optimal solution to this problem is complexity-prohibitive especially with large numbers of users and small base stations (SBSs) because it requires an exhaustive search over all possible combinations of SBSs, NUs, and FUs. To simplify the solution, we develop a two-step approach by decomposing the original problem into a power allocation problem and a user scheduling problem. We derive the closed-form solution of the power allocation problem via analyzing the objective function and constraints. The user scheduling problem is a joint user pairing and access point assignment problem. To solve it, we propose an SBS-NU-FU matching algorithm to obtain a near-optimal one-to-one three-sided matching of SBSs, NUs, and FUs. The simulation results show that the two-step method gets around 95% of the system throughput of the optimal one and can significantly improve the spectral efficiency of the D2D-enabled HetNets.

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Section: Introductionmentioning

confidence: 99%

Joint Power Allocation and User Scheduling for Device-to-Device-Enabled Heterogeneous Networks With Non-Orthogonal Multiple Access

Liu

Xiao

et al. 2019

IEEE Access

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“…Caching can induce the sleeping state in some sBSs. Therefore, caching can decrease the intensity of active BSs in the UDN [30,31].…”

Section: Numerical and Simulation Resultsmentioning

confidence: 99%

Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network

Pei

Gong

Gao

et al. 2019

Sci. China Inf. Sci.

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We investigate an energy-saving sleeping mechanism in a cache-aided ultra-dense network (UDN) with delay constraints. As in existing works, we consider the video and file contents of the UDN. The video contents are cached at and delivered by a small-cell base-station (sBS). The cache-aided sBS cooperates with a macro-cell base-station (mBS) to service the file contents. The optimal sleeping strategy that conserves energy under the delay constraint is formulated as an energy-consumption minimization problem under the network stability condition with a guaranteed delay constraint. To find its solution, the minimization problem is transformed into a joint optimization problem of energy consumption and delay by the Lyapunov technique. A delay-constrained sleeping algorithm is proposed, and its effectiveness is confirmed by the numerical results of a simulation study. A tradeoff between energy consumption and delay, achieved by adjusting the weighting factor in the cache-aided UDN, is also demonstrated.

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“…Note that UDN would be one of the main features of 5G and beyond [103][104][105]. As the small cell density increases, the co-tier ICI in the small cell layer increases and there may exist more dominant interferers [106][107][108]. It is desirable to investigate the interference distribution as the small cell density increases, including the cross-tier and co-tier ICI.…”

Section: Eicic For 5g Ultradense Cellular Networkmentioning

confidence: 99%

Time-domain ICIC and optimized designs for 5G and beyond: a survey

Liu

Zhou

Vasilakos

et al. 2018

Sci. China Inf. Sci.

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Time-domain enhanced inter-cell interference coordination (eICIC) is an effective technique to reduce the cross-tier inter-cell interference (ICI) in long term evolution (LTE)-based heterogeneous small cell networks (HetSCNs). This paper first clarifies two main communication scenarios in HetSCNs, i.e., macrocells deployed with femtocells (macro-femto) and with picocells (macro-pico). Then, the main challenges in HetSCNs, particularly the severe cross-tier ICI in macro-femto caused by femtocells with closed subscribe group (CSG) access or in macro-pico caused by picocells with range expansion are analyzed. Based on the prominent feature of dominant interference in HetSCNs, the main idea of time-domain interference coordination and two basic schemes in the eICIC standardization, i.e., almost blank subframe (ABS) and orthogonal frequency division multiplexing symbol shift are presented, with a systematic introduction to the interactions of these techniques with other network functions. Then, given macro-femto and macro-pico HetSCNs, an overview is provided on the advanced designs of ABS-based eICIC, including self-optimized designs with regard to key parameters such as ABS muting ratio, and joint optimized designs of ABS-based eICIC and other radio resource management techniques, such as user association and power control. Finally, the open issues and future research directions are discussed.

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Energy-aware deployment of dense heterogeneous cellular networks with QoS constraints

Cited by 5 publications

References 19 publications

Joint Power Allocation and User Scheduling for Device-to-Device-Enabled Heterogeneous Networks With Non-Orthogonal Multiple Access

Joint Power Allocation and User Scheduling for Device-to-Device-Enabled Heterogeneous Networks With Non-Orthogonal Multiple Access

Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network

Time-domain ICIC and optimized designs for 5G and beyond: a survey

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