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2018 IEEE 5G World Forum (5GWF)最新文献

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User Localization Enabled Ultra-dense Network Testbed 用户本地化支持的超密集网络测试平台
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8517071
N. Malm, Liang Zhou, Estifanos Yohannes Menta, K. Ruttik, R. Jäntti, O. Tirkkonen, Mário Costa, Kari Leppänen
We present an over-the-air testbed designed for assessing the performance of ultra-dense networks and related mobility management schemes based on tracking the location of user equipment. Location information of UEs at the physical layer of the radio access network allows for proactive and seamless handovers. This is particularly important for 5G ultra-dense networks where small cells may otherwise be overwhelmed by handover related signalling. We exploit sounding reference signals transmitted by UEs to track their location. Novel mobility management schemes can then be designed such that handover triggering is done by the network and without UE involvement. In current cellular networks, handover is triggered by downlink measurements carried out at the UE, and subsequent reporting. This work also validates our testbed’s proof-of-concept software architecture based on stateless unordered worker threads. In particular, a Cloud-RAN of up to four radio transceiver points can be combined into a network overseen by one gNB. Also, dataplane support allows for experimentation with real-time data handovers. The obtained results demonstrate the feasibility of location-based handover schemes as a tool for future cellular network design.
我们提出了一个空中测试平台,旨在评估超密集网络的性能和基于跟踪用户设备位置的相关移动性管理方案。无线接入网物理层终端的位置信息可以实现主动无缝切换。这对于5G超密集网络尤其重要,否则小型蜂窝可能会被切换相关的信号淹没。我们利用ue发出的探空参考信号来追踪它们的位置。然后可以设计新颖的移动性管理方案,使切换触发由网络完成,而不需要UE参与。在当前的蜂窝网络中,切换是由在终端进行的下行链路测量和随后的报告触发的。这项工作还验证了我们的测试平台基于无状态无序工作线程的概念验证软件架构。特别是,多达四个无线电收发器点的Cloud-RAN可以组合成由一个gNB监督的网络。此外,数据平面支持允许对实时数据移交进行实验。所得结果证明了基于位置的切换方案作为未来蜂窝网络设计工具的可行性。
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引用次数: 9
5G New Radio Physical Random Access Preamble Design 5G新无线电物理随机接入导言设计
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8517052
Gerhard Schreiber, Marcos Tavares
To cope with the stringent requirements imposed on the random access (RA) procedure by the use cases envisioned for 5G NR, we propose an RA preamble design based on cyclically delay-Doppler shifted m-sequences. In contrast to the legacy 4G LTE RA preambles based on Zadoff-Chu (ZC) sequences, the proposed design is very robust against frequency uncertainties originating from wireless channel propagation and local oscillator imperfections. Simulation results show that the proposed m-sequence based preambles deliver good performance even under harsh transmission conditions, while ZC based preambles fail. Further advantages of adopting m-sequence based preambles in 5G NR include random access channel (RACH) capacity enhancement, support for low-power devices and low complexity implementation.
为了应对5G新空口设想用例对随机接入(RA)过程的严格要求,我们提出了一种基于周期延迟-多普勒移位m序列的随机接入(RA)序文设计。与传统的基于Zadoff-Chu (ZC)序列的4G LTE RA前导相比,该设计对由无线信道传播和本地振荡器缺陷引起的频率不确定性具有很强的鲁棒性。仿真结果表明,在恶劣的传输条件下,基于m序列的前导具有良好的传输性能,而基于ZC序列的前导则失效。在5G NR中采用基于m序列的前导的进一步优势包括随机接入信道(RACH)容量增强、支持低功耗设备和低复杂度实现。
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引用次数: 21
A Low-Complexity Method for Evaluating the Distance Spectrum of Polar Codes 一种评估极码距离谱的低复杂度方法
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8516712
G. Chen, Lei Cao, Kangjian Qin, Zhaoyang Zhang
Different from linear block codes that may use one single generator matrix for different channel conditions, polar codes have different generator matrices for different channel conditions. Few papers investigated polar codes from the view of different distance spectrum associated with different generator matrices. Successive cancellation list (SCL) decoding was proposed to evaluate the distance spectrum of polar codes. However, the large memory requirement of SCL decoding using a large number of survival paths can be beyond the memory constraint of normal computers. One practical method to evaluate the distance spectrum of polar codes with SCL decoding was implemented with the aid of hard disk to store the immediately generated data. In this paper, we modify the algorithm of SCL decoding proposed by Tal and Vardy to largely reduce the time complexity and the required space in hard disk. With this method, we further investigate the distance spectrum of polar codes with length N = 128 and N = 256, respectively.
不同于线性分组码在不同的信道条件下可能使用一个单一的生成器矩阵,极性码在不同的信道条件下具有不同的生成器矩阵。很少有文章从与不同发生器矩阵相关的不同距离谱的角度研究极性码。提出了一种利用逐次消去表译码的方法来评估极化码的距离谱。然而,使用大量生存路径的SCL解码的大内存需求可能超出普通计算机的内存限制。利用硬盘存储即时生成的数据,实现了一种利用SCL译码评估极性码距离谱的实用方法。本文对Tal和Vardy提出的SCL解码算法进行了改进,大大降低了时间复杂度和对硬盘空间的要求。利用该方法,我们进一步研究了长度分别为N = 128和N = 256的极码的距离谱。
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引用次数: 0
Downlink Scheduling and Resource Allocation for 5G MIMO Multicarrier Systems 5G MIMO多载波系统下行链路调度与资源分配
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8516933
Ankur Vora, K. Kang
Emerging 5G wireless communication technology is envisioned to significantly enhance the performance. In this paper, we propose a new algorithm for effective cross-layer downlink scheduling and resource allocation (SRA) considering the channel and queue state, while supporting fairness. We also integrate our cross-layer SRA scheme with filter-bank multicarrier/offset quadrature amplitude modulation (FBMC/OQAM) to leverage the higher spectral efficiency. Our performance evaluation results show that our SRA method outperforms a novel SRA algorithm [1] by up to approximately 60%, 2.6%, and 1.6% in terms of goodput, goodput fairness, and delay fairness, respectively.
预计新兴的5G无线通信技术将大幅提高性能。本文提出了一种考虑信道和队列状态,同时支持公平性的有效跨层下行链路调度和资源分配(SRA)算法。我们还将跨层SRA方案与滤波器组多载波/偏置正交调幅(FBMC/OQAM)集成,以利用更高的频谱效率。我们的性能评估结果表明,我们的SRA方法在goodput、goodput公平性和延迟公平性方面分别比一种新的SRA算法[1]高出约60%、2.6%和1.6%。
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引用次数: 3
Massive Machine Type Communications over 5G using Lean Protocols and Edge Proxies 使用精益协议和边缘代理的5G大规模机器类型通信
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8517086
R. Bhatia, B. Gupta, S. Benno, Jairo O. Esteban, D. Samardzija, Marcos Tavares, T. V. Lakshman
In the foreseeable future, massive Machine Type Communication (mMTC) is slated to become a dominating communication paradigm in Industry 4.0, eHealth, connected homes and smart cities. This can pose significant challenges to cellular networks as both the signaling and power overhead for connection management and the communication tax in the form of protocol headers can no longer be amortized against infrequent small data transfers from very large number of low capability devices as is common with mMTC. The impending arrival of 5G provides the perfect opportunity to evolve cellular networks for mMTC. In this paper, we identify the underlying issues and propose novel architectural enhancements and protocol optimizations for reducing the mismatch between mMTC and cellular networks. This includes lean connectionless signaling protocols for network access and core networking, low overhead data protocols optimized for small packet transmission and mMTC Edge Proxies for offloading both processing and networking for devices with limited capabilities. We show using numerical data, that the proposed solution realizes achieves significant capacity gains for short mMTC packets applications when compared to legacy air-interfaces and commonly used networking protocols. More specifically, the proposed solution is capable of supporting 4 times more users than legacy LTE while showing gains of 25% and 16% over TCP/IP and IoT protocols such as CoAP over 6LowPAN, respectively. Finally, our solution is able to provide communication latencies under 10 ms with low jitter, which makes it a good candidate for industrial IoT applications.
在可预见的未来,大规模机器类型通信(mMTC)将成为工业4.0、电子健康、互联家庭和智慧城市的主要通信模式。这可能对蜂窝网络构成重大挑战,因为连接管理的信令和功率开销以及协议标头形式的通信税都不能再像mMTC那样,在来自大量低容量设备的不频繁的小数据传输中分摊。即将到来的5G为mMTC提供了发展蜂窝网络的绝佳机会。在本文中,我们确定了潜在的问题,并提出了新的架构增强和协议优化,以减少mMTC和蜂窝网络之间的不匹配。这包括用于网络接入和核心网络的精简无连接信令协议,针对小数据包传输优化的低开销数据协议,以及用于为功能有限的设备卸载处理和网络的mMTC边缘代理。我们使用数值数据表明,与传统的空中接口和常用的网络协议相比,所提出的解决方案实现了短mMTC数据包应用程序的显着容量增益。更具体地说,拟议的解决方案能够支持比传统LTE多4倍的用户,同时比TCP/IP和物联网协议(如CoAP)在6LowPAN上分别增加25%和16%。最后,我们的解决方案能够提供10毫秒以下的通信延迟和低抖动,这使其成为工业物联网应用的良好候选者。
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引用次数: 5
Long distance and high bandwidth wireless link tests for a 39 GHz to 28 GHz 5G low-cost repeater 39 GHz至28 GHz 5G低成本中继器的长距离和高带宽无线链路测试
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8516931
S. Maier, H. Schlesinger, W. Templ, H. Viswanathan
This paper presents a low-cost millimeter-wave repeater for range extension in a 5G fixed wireless access system. It simply converts the wireless fronthaul signals in the 39 GHz band to the wireless access signals in the 28 GHz band without any base-band signal processing. Initial outdoor over-the-air tests with a simplified setup proved that a sufficient linearity can easily be achieved even over long fronthaul link length. Moreover, high bandwidth measurements with multi-carrier 5GTF pre-5G test signals demonstrated excellent EVM values with high signal-to-noise ratios enabling the required high data rates.
提出了一种低成本的毫米波中继器,用于5G固定无线接入系统的范围扩展。它只是将39ghz频段的无线前传信号转换为28ghz频段的无线接入信号,不进行基带信号处理。通过简化设置的初始室外无线测试证明,即使在较长的前传链路长度上,也可以轻松实现足够的线性。此外,使用多载波5GTF pre-5G测试信号进行的高带宽测量显示出出色的EVM值,具有高信噪比,可实现所需的高数据速率。
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引用次数: 1
Millimeter Wave Massive MIMO with Alamouti Code and Imperfect Channel State Information 基于Alamouti码和不完全信道状态信息的毫米波大规模MIMO
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8516942
Mohamed Alouzi, François Chan
Massive MIMO is one of the technologies considered in 5G to provide a much higher capacity without requiring more wireless spectrum. Because of the congestion in the radio frequency spectrum below 6 GHz, the millimeter Wave (mmWave) band has increasingly become more attractive to researchers since it offers a much larger unused bandwidth. However, the higher path loss at mmWave frequencies and the poor scattering nature of the mmWave channel (fewer paths exist) represent a challenge for communications. A hybrid beamforming technique with large antenna arrays and the Alamouti coding scheme are used in this paper to improve the performance of a single-user mmWave massive MIMO system. When perfect Channel State Information (CSI) is not available at the Base Station (BS), computer simulations have shown that a gain of 20 dB or more can be achieved by using the Alamouti code compared to the system with hybrid beamforming only, and more importantly, the error probability does not level off.
大规模MIMO是5G中考虑的技术之一,可以在不需要更多无线频谱的情况下提供更高的容量。由于6ghz以下无线电频谱的拥塞,毫米波(mmWave)频段对研究人员越来越有吸引力,因为它提供了更大的未使用带宽。然而,毫米波频率下较高的路径损耗和毫米波信道的差散射特性(存在较少的路径)对通信构成了挑战。为了提高单用户毫米波大规模MIMO系统的性能,本文采用了大型天线阵列的混合波束形成技术和Alamouti编码方案。计算机仿真结果表明,当基站无法获得完美的信道状态信息(CSI)时,与仅使用混合波束形成的系统相比,使用Alamouti码可以获得20 dB以上的增益,更重要的是,错误概率不会趋于平稳。
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引用次数: 6
A Semi-Blind Channel Estimation Algorithm for One-bit Massive MIMO Systems 一种位大规模MIMO系统的半盲信道估计算法
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8516943
B. Srinivas, D. Sen, S. Chakrabarti
Massive multiple-input-multiple-output (MIMO) uses a large number of antennas and radio frequency (RF) chains which incur a huge cost and power consumption. Since high-resolution analog-to-digital converters (ADCs) consumes a major portion of the RF chain circuit power, so one-bit massive MIMO systems are seen as one of the potential solutions to reduce the power consumption and cost associated with the RF chains. Our paper addresses channel estimation issue which is among one of the crucial needs for the practical realization of one-bit massive MIMO systems. The pilot-aided channel estimator demands additional pilots to improve the estimation accuracy which in turn reduces the spectral efficiency of the system. To overcome this, we propose an iterative semi-blind based channel estimator for one-bit massive MIMO systems. The proposed algorithm consists of two stages: initialization and iteration. The initial channel estimate is obtained from the pilot based initialization stage, which is refined further in the iteration stage with the help of both pilot and few data symbols. So, the semi-blind estimator improves estimation accuracy without the addition of extra pilot symbols into the system. Through simulations, we show that the proposed scheme achieves significant improvement against the existing pilot based estimators in terms of estimation accuracy and bit error rate (BER) at the cost of a nominal increase in the computational complexity. Further, the proposed algorithm attains convergence in almost one iteration for all the considered scenarios of one-bit massive MIMO system. Thus, the semi-blind estimator is spectral and power efficient in comparison to the existing pilot based algorithms.
大规模多输入多输出(MIMO)使用了大量的天线和射频链,产生了巨大的成本和功耗。由于高分辨率模数转换器(adc)消耗了射频链电路功率的主要部分,因此1位大规模MIMO系统被视为降低射频链相关功耗和成本的潜在解决方案之一。信道估计问题是实际实现1位大规模MIMO系统的关键问题之一。导频辅助信道估计需要额外的导频来提高估计精度,这反过来又降低了系统的频谱效率。为了克服这个问题,我们提出了一种基于迭代的半盲信道估计器,用于1位大规模MIMO系统。该算法分为初始化和迭代两个阶段。初始信道估计由导频初始化阶段得到,在迭代阶段利用导频和少量数据符号进一步细化。因此,半盲估计器在不向系统中添加额外导频符号的情况下提高了估计精度。通过仿真,我们表明所提出的方案在估计精度和误码率(BER)方面比现有的基于导频的估计器有了显著的改进,但代价是计算复杂度的名义增加。此外,该算法对所有考虑的1位大规模MIMO系统场景几乎只需一次迭代即可实现收敛。因此,与现有的基于导频的算法相比,半盲估计器具有频谱和功耗效率。
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引用次数: 1
An Efficient Limited Feedback for Multi-panel based 2D Antenna Array 基于多面板的二维天线阵的有效有限反馈
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8517029
Moon-il Lee, Loïc Canonne-Velasquez, Janet Stern-Berkowitz
In this paper, a multi-component codebook structure is proposed for a channel state information (CSI) feedback to achieve an optimized beamforming gain with a limited feedback overhead when a base station (BS) is equipped with a multi-panel based 2D antenna array, where each antenna panel is a uniform rectangular array (URA). The proposed multi-component code-book structure is extended from a codebook designed for a single-panel based 2D antenna array by introducing a component pre-coder which is used to co-phase precoders across the panels. System level simulation results show that introduction of the component precoders for co-phasing of multiple panels can provide significant user packet throughput performance gain with a marginal increase in feedback overhead.
本文提出了一种用于信道状态信息反馈的多分量码本结构,当基站配备基于多面板的二维天线阵列(其中每个天线面板为均匀矩形阵列(URA))时,可以在有限的反馈开销下获得优化的波束形成增益。所提出的多分量码本结构是在为基于单面板的二维天线阵列设计的码本基础上进行扩展的,引入了用于跨面板共相预编码器的分量预编码器。系统级仿真结果表明,在反馈开销略有增加的情况下,引入组件预编码器用于多面板共相可以提供显著的用户数据包吞吐量性能增益。
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引用次数: 0
Physical Uplink Control Channel Design for 5G New Radio 5G新无线电物理上行控制信道设计
Pub Date : 2018-07-01 DOI: 10.1109/5GWF.2018.8517042
Lopamudra Kundu, Gang Xiong, Joonyoung Cho
The next generation wireless communication system, 5G, or New Radio (NR) will provide access to information and sharing of data anywhere, anytime by various users and applications with diverse multi-dimensional requirements. Physical Uplink Control Channel (PUCCH), which is mainly utilized to convey Uplink Control Information (UCI), is a fundamental building component to enable NR system. Compared to Long Term Evolution (LTE), more flexible PUCCH structure is specified in NR, aiming to support diverse applications and use cases. This paper describes the design principles of various NR PUCCH formats and the underlying physical structures. Further, extensive simulation results are presented to explain the considerations behind the NR PUCCH design.
下一代无线通信系统5G或新无线电(NR)将为具有不同多维需求的各种用户和应用提供随时随地的信息访问和数据共享。物理上行控制信道(Physical Uplink Control Channel, PUCCH)主要用于传输上行控制信息(Uplink Control Information, UCI),是实现NR系统的基本组成部分。与长期演进(LTE)相比,NR中规定了更灵活的PUCCH结构,旨在支持多种应用和用例。本文介绍了各种NR PUCCH格式的设计原理和底层物理结构。此外,还提供了大量的仿真结果来解释NR PUCCH设计背后的考虑因素。
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引用次数: 15
期刊
2018 IEEE 5G World Forum (5GWF)
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