A Field Trial of Multi-Cell Cooperative Transmission over LTE System

Nagate, Atsushi; Hoshino, Kenji; Mikami, Mikio; Fujii, Teruya

doi:10.1109/icc.2011.5962491

Cited by 20 publications

(8 citation statements)

References 11 publications

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“…2 shows the distributed sector configuration using optical fiber. In this configuration, a base band signal processing unit (BBU) handling three sectors is located at one place and its Radio Frequency Units (RFUs) are located at different antenna sites via optical fibers [16]. When we assume LTE systems, an eNB handling three sectors is placed at one place and its three sectors are placed at different antenna sites by using Remote Radio Head (RRH) or Radio over Fiber (RoF) systems.…”

Section: Distributed Sector Configuration Using Optical Fibermentioning

confidence: 99%

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Multi-BS Cooperative Interference Control for LTE Systems

Ogata

Nagate

Fujii

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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Inter-Cell Interference Coordination (ICIC) is attracting attention recently. In ICIC, cell-edge throughput can be improved by preventing BSs from transmitting signals (hereafter, muting BSs), and the information exchange among BSs is little because each UE is only served by a BS at any instant. However, when a BS is muted, no radio resource is allocated to UEs belonging to the muted BS while UEs belonging to other BSs enjoy high cell-edge throughput. Therefore, there is a possibility that overall cell performance may degrade. To prevent this, we propose a multi-BS cooperative interference control method. The basic concept of the proposed method is that the muting is triggered only when the total throughput of the cooperation area is increased by the muting compared to the total throughput possible without muting. The proposed method makes it possible to increase cell-edge throughput without degrading overall cell performance. We also propose a way to realize this interference control on practical systems. First, we propose a way to realized it on 3GPP Release 8 LTE systems. In the proposed interference control, it is important to estimate throughput (SINR) values with and without muting appropriately. We propose to utilize feedback signals defined in LTE such as Channel Quality Indicator (CQI) and Received Signal Received Power (RSRP) to achieve the accurate throughput estimation. Furthermore, we propose to realize the proposed interference control on a distributed sector configuration using optical fiber systems such as Radio over Fiber (RoF) or Remote Radio Head (RRH). With this configuration, it is possible to achieve ICIC with less burden of information exchange. Especially with three sector configuration, it is possible to achieve "inter-cell" cooperation with "inter-sector" cooperation, which can be easily implemented.

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Section: Distributed Sector Configuration Using Optical Fibermentioning

confidence: 99%

“…Most of these techniques are based on joint transmission (JT), in which multiple BSs coordinate their antennas to jointly transmit the desired signal to the user equipment (UE) [12][13][14]. We have proposed a simple JT implementation technique and conducted a field trial that confirmed its feasibility and performance [15,16].…”

Section: Introductionmentioning

confidence: 99%

Multi-BS Cooperative Interference Control for LTE Systems

Ogata

Nagate

Fujii

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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“…Single-mode-fibre (SMF) is used traditionally for the long distance applications due to its low attenuation, whereas the multi-mode-fibre (MMF) is mostly used for short distance applications [2]. In [3] the coverage of eNB was extended up to 2.1 km using the RoF technology based on SMF. Commercial LTE-RoF solutions were demonstrated by CommScope for inbuilding applications using distributed antenna system to overcome high RF signal penetration losses [4].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Al-Musawi

Cseh

Bohata

et al. 2017

J. Lightwave Technol.

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Abstract-This paper demonstrates a hybrid radio over multimode fibre and free space optics (RoMMF-FSO) system that can be used to extend the transmission range of the 4 th generation longterm evolution (4G-LTE) signal in access networks. A single mode filtering technique (SMFT) is used to enhance 4G-LTE performance. The proposed scheme is evaluated in terms of the system transfer function, laser beam profile, and error vector magnitude (EVM). We show that using SMFT increases the RoMMF-FSO system bandwidth by 2 GHz and improves the received optical power by 13.6 dB. Moreover, the proposed system enhances the EVM by 4%. The measured results show that using a 1 km MMF instead of a 1 km SMF will marginally increase the measured EVM from ~6.6% to ~7% with a 0.2 dB power penalty with respect to the LTE EVM limit of 12.5% as is specified for 16-quadrature amplitude modulation. The proposed system is validated practically under atmospheric turbulence conditions to mimic the outdoor environment. Measured EVM results are verified theoretically through transmitting LTE signals with turbulent using log-normal model. We also show that for a FSO link span of 500 m to meet the EVM target of 12.5% the SNR power penalties are ~2 dB and ~11 dB for σ R 2 of 1.2×10 -4 and 0.1, respectively compared with no turbulence.Index Terms-Free space optics, long term evolution, multimode optical fibres, radio-over-fibre.

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“…However, systems with a cell extension of 3.2 km employing a line-of-sight connectivity utilizing a radio frequency (RF) wireless interface between eNB and decode-and-forward RNs has been reported [3], which is not compatible with the urban area application with the RF wireless interface. Radio-over-fiber (RoF)-based eNB offers coverage extension up to 2.1 km with multicooperative schemes as proposed in [4]. Kanesan et al and Ng et al have shown theoretically [5] and experimentally [6], respectively, that a much longer coverage extension of up to 68 and 60 km, respectively, can be achieved for eNB by means of RNs (i.e., amplification and forwarding [AF]) via the RoF interface.…”

Section: Introductionmentioning

confidence: 99%

“…Kanesan et al and Ng et al have shown theoretically [5] and experimentally [6], respectively, that a much longer coverage extension of up to 68 and 60 km, respectively, can be achieved for eNB by means of RNs (i.e., amplification and forwarding [AF]) via the RoF interface. The prior reported cell extension schemes have mainly focused on the downlink (DL) transmission in a half duplex system of LTE [1,[3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System

Kanesan¹,

Ng²,

Ghassemlooy³

et al. 2013

J. Opt. Commun. Netw.

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Abstract-In this paper, we experimentally demonstrate the seamless integration of full duplex system frequency division duplex (FDD) long-term evolution (LTE) technology with radio over fiber (RoF) for eNodeB (eNB) coverage extension. LTE is composed of quadrature phase-shift keying (QPSK), 16-quadrature amplitude modulation (16-QAM) and 64-QAM, modulated onto orthogonal frequency division multiplexing (OFDM) and single-carrier-frequency division multiplexing for downlink (DL) and uplink (UL) transmissions, respectively. The RoF system is composed of dedicated directly modulated lasers for DL and UL with dense wavelength division multiplexing (DWDM) for instantaneous connections and for Rayleigh backscattering and nonlinear interference mitigation. DL and UL signals have varying carrier frequencies and are categorized as broad frequency spacing (BFS), intermediate frequency spacing (IFS), and narrow frequency spacing (NFS). The adjacent channel leakage ratio (ACLR) for DL and UL with 64-QAM are similar for all frequency spacings while cross talk is observed for NFS. For the best case scenario for DL and UL transmissions we achieve error vector magnitude (EVM) values of ∼2.30%, ∼2.33%, and ∼2.39% for QPSK, 16-QAM, and 64-QAM, respectively, while for the worst case scenario with a NFS EVM is increased by 0.40% for all schemes.

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A Field Trial of Multi-Cell Cooperative Transmission over LTE System

Cited by 20 publications

References 11 publications

Multi-BS Cooperative Interference Control for LTE Systems

Multi-BS Cooperative Interference Control for LTE Systems

Adaptation of Mode Filtering Technique in 4G-LTE Hybrid RoMMF-FSO for Last-Mile Access Network

Experimental Full Duplex Simultaneous Transmission of LTE Over a DWDM Directly Modulated RoF System

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