Experimental study on UE-oriented frequency reuse for indoor DAS networks

Cheng, Huiting; Leng, Xiaobing; Yan-bo, Tang; Liu, Yong

doi:10.1109/pimrc.2015.7343462

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…An effective solution for 3D in‐building coverage is distributed antennas systems where antennas of a BS are distributed within a building. Several studies exist on the interference management and resource reuse aspects using distributed antennas systems in 3D in‐building scenarios . However, one of the major difficulties with distributed antennas systems is that each antenna covers typically a larger area than that by a FC, and hence resource reuse and correspondingly overall throughput gain by distributed antennas systems are lower than those achieved by FC‐based HetNets .…”

Section: Introductionmentioning

confidence: 99%

A novel frequency reuse technique for in‐building small cells in dense heterogeneous networks

Saha

Aswakul

2017

IEEJ Transactions Elec Engng

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In this paper, we address the important issue of reusing frequency resource in femtocells deployed in dense multi-floor buildings over a large urban macrocell coverage to enhance network capacity and spectral efficiency using almost blank subframe (ABS)based enhanced inter-cell interference coordination (eICIC) technique. Femtocell clustering and modeling an optimum number of ABS (OPNA) are, however, two major challenges to reuse frequency in femtocells deployed in buildings using ABS-based eICIC. In this paper, we address these challenges by exploiting the high external wall penetration loss of any buildings and in-between distance of neighboring buildings, and propose a femtocell clustering approach by considering all femtocells in any buildings as a femtocell cluster to avoid an additional computational complexity from clustering. We develop a frequency reuse and scheduling algorithm (FRSA) for an arbitrary number of ABSs for a multi-tier network, which consists of in-building femtocells and outdoor picocells in the coverage of an urban macrocell. We then propose a model for estimating the OPNA and derive an OPNA per femtocell cluster basis under two schemes, namely adaptive OPNA and non-adaptive OPNA, in order to vary the number of ABSs imposed on femtocells within a building dynamically based on the presence of indoor macrocell users within the building to avoid cross-tier interference with femtocells. An optimization algorithm for OPNA schemes is developed, and its implementation aspects are discussed. The impact of varying the number of ABSs and femtocells per building on the throughput performance of FRSA is analyzed through an extensive system-level simulation, and the capacity outperformance of the adaptive over the non-adaptive OPNA scheme is shown. Finally, a schematic of the scheduler implementation for FRSA is developed, and the capacity outperformance of FRSA over a number of existing works is shown. co-channel FC deployment, clustering FCs and reusing resources in FCs with proper interference management are the major challenges in urban environments, which raise a number of issues discussed in the following.First is FC clustering, which is an effective technique to improve network capacity by disjointing a set of femtocell BSs (FCBSs) over the whole or a part (e.g., a multi-floor building) of an MC coverage into a number of subsets or groups. A group of such FCBSs is called a femtocell cluster (FCL). Existing FC clustering approaches over an MC coverage are associated with a number of pitfalls, such as the following:1. The maximum resource reuse factor for FCLs per MC is difficult to define, as the size of an FCL and the maximum amount of resources allocated in it are interdependent because of co-channel interference from neighboring FCLs [4]. 2. Since in practice indoor FCBSs are typically deployed by users and random in placement, prior knowledge of the number of FCLs in an MC coverage [4] is not immediate. 3. An extreme level of network densification cannot be exploited since decreasing the siz...

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Section: Introductionmentioning

confidence: 99%

A novel frequency reuse technique for in‐building small cells in dense heterogeneous networks

Saha

Aswakul

2017

IEEJ Transactions Elec Engng

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“…An effective solution for 3D in-building coverage is DAS where antennas of a BS are distributed within a building. Several works studied interference management and resource reuse aspects using DAS in 3D in-building scenarios [12][13][14][15]. However, one of the major difficulties with DAS is that each antenna covers typically a larger area than that by a FC, and hence resource reuse and correspondingly overall throughput gain by DAS are lower than that achieved by FC based HetNets [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of high capacity mobile network with 3D in-building dense small cell

Saha

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This dissertation research emphasizes on achieving high capacity demand of next generation mobile networks (NGMN), i.e. fifth generation (5G), with small cells, i.e. femtocells, deployed in 3-dimensional (3D) indoor coverages by employing such procedures as managing co-channel interference, enforcing a minimum distance, reusing spectrum, and splitting control-plane and user-plane (C-/U-plane) of femtocells. In conventional mobile networks, a common feature is tightly coupled C-/U-plane architecture (CUCA) which is one of the major reasons for most of the problems that small cell network densification faces, e.g. complex interference management. This call for developing a new C-/U-plane split architecture (CUSA) by decoupling C-/U-plane. Further, in cellular mobile networks, most of the data traffic is generated within indoor coverages, mainly in urban environments where an existence of dense high rise multi-floor buildings is a typical scenario. Furthermore, mobile radio propagation in 3D scenario is far more complex than that of 2D scenario. These cause such inevitable issues as small cell network architecture modeling and interference characterization, resource reuse and allocation strategy development, and small cell densification limit characterization to call for their in-depth investigation and the development of new design technique for 3D in-building small cell networks. This dissertation research addresses these aforesaid issues. More specifically, the following objectives are addressed in this dissertation: (i) a review on enabling technologies for proposing a framework of NGMN architectural evolution to achieve the prospective capacity of NGMN; for cell-centric networks, (ii) an adaptive almost blank subframe (ABS) based enhanced intercell interference coordination (eICIC) enabled frequency reuse and scheduling algorithm (FRSA) for an orthogonal resource reuse and allocation (ORRA), (iii) a tractable analytical model for interference characterization and minimum distance enforcement for non-ORRA (NORRA), and (iv) a novel clustering approach along with developing a number of strategies to reuse resources in femtocells within a 3D multi-floor building; for device-centric networks, (v) a novel multi-band enabled small cell and UE architecture for uplink/downlink (UL/DL) and C-/U-plane splitting, (vi) numerous small cell base station (SCBS) architectures for performance comparisons between CUCA and CUSA, and (vii) a centralized 3D radio resource allocation and scheduling approach for CUSA.

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Experimental study on UE-oriented frequency reuse for indoor DAS networks

Cited by 2 publications

References 3 publications

A novel frequency reuse technique for in‐building small cells in dense heterogeneous networks

A novel frequency reuse technique for in‐building small cells in dense heterogeneous networks

Analysis of high capacity mobile network with 3D in-building dense small cell

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