基于熱點(diǎn)城區(qū)測(cè)算中國(guó)2020年移動(dòng)通信頻譜需求

黃標(biāo)，王坦

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基于熱點(diǎn)城區(qū)測(cè)算中國(guó)2020年移動(dòng)通信頻譜需求

黃標(biāo)，王坦

摘要：提出了一種適合中國(guó)國(guó)情的頻譜需求的預(yù)測(cè)方法。該預(yù)測(cè)方法充分借鑒了國(guó)際現(xiàn)有方法，可合理滿(mǎn)足未來(lái)國(guó)際移動(dòng)通信系統(tǒng)（IMT）的發(fā)展需求，實(shí)現(xiàn)頻率資源的科學(xué)分配和使用，避免盲目規(guī)劃導(dǎo)致的資源浪費(fèi)。該預(yù)測(cè)方法從業(yè)務(wù)密集地區(qū)著手，通過(guò)調(diào)研運(yùn)營(yíng)商第一手?jǐn)?shù)據(jù)，給出了更加精確的測(cè)算結(jié)果，可供中國(guó)運(yùn)營(yíng)商評(píng)估現(xiàn)有頻譜使用情況、論證階段頻譜需求時(shí)使用。

關(guān)鍵詞：頻譜需求預(yù)測(cè)；熱點(diǎn)地區(qū)；國(guó)際移動(dòng)通信系統(tǒng)；第五代移動(dòng)通信

Context-aware opportunistic networking in multi-hop cellular networks

Coll-Perales, B; Gozalvez, J; Friderikos, V

Abstract:5G networks will be required to efficiently support the growth in mobile data traffic. One approach to do so is by exploiting Device-to-Device (D2D) communications and Multi-Hop Cellular Networks (MCNs) in order to enhance the spectrum re-use and offload traffic over underlay networks. This study proposes to further improve the efficiency of transmitting mobile data traffic by integrating opportunistic networking principles into MCNs. Opportunistic networking can exploit the delay tolerance characteristic of relevant data traffic services in order to search for the most efficient transmission conditions in MCNs. The study first presents an analytical framework for two-hop opportunistic MCNs designed to identify their optimum configuration in terms of energy efficiency. Using this reference configuration, the paper then proposes a set of opportunistic forwarding policies that exploit context information provided by the cellular network. Numerical and simulation results demonstrate that opportunistic networking can significantly contribute towards achieving the capacity and energy efficiency gains sought for 5G networks. Under the evaluated conditions, the obtained results show that the proposed schemes can reduce the energy consumption compared to traditional cellular communications by up to 98％ for delay tolerant services. In addition, the proposed schemes can increase the cellular capacity by up to 79％ compared to traditional cellular communications. With the severe spectrum shortage in conventional cellular bands, large-scale antenna systems in the mmWave bands can potentially help to meet the anticipated demands of mobile traffic in the 5G era. There are many challenging issues, however, regarding the implementation of digital beamforming in large-scale antenna systems: complexity, energy consumption, and cost. In a practical large-scale antenna deployment, hybrid analog and digital beamforming structures can be important alternative choices. In this article, optimal designs of hybrid beamforming structures are investigated, with the focus on an N (the number of transceivers) by M (the number of active antennas per transceiver) hybrid beamforming structure. Optimal analog and digital beamforming designs in a multi-user beamforming scenario are discussed. Also, the energy efficiency and spectrum efficiency of the N x M beamforming structure are analyzed, including their relationship at the green point (i.e., the point with the highest energy efficiency) on the energy efficiency-spectrum efficiency curve, the impact of N on the energy efficiency performance at a given spectrum efficiency value, and the impact of N on the green point energy efficiency. These results can be conveniently utilized to guide practical LSAS design for optimal energy/spectrum efficiency trade-off. Finally, a reference signal design for the hybrid beamform structure is presented, which achieves better channel estimation performance than the method solely based on analog beamforming. It is expected that large-scale antenna systems with hybrid beamforming structures in the mmWave band can play an important role in 5G. Heterogeneous and small cell networks (HetSNets) increase spectral efficiency and throughput via hierarchical deployments. In order to meet the increasing requirements in capacity for future 5Gwireless networks, millimeter-wave (mmWave) communications with unprecedented spectral resources have been suggested for 5G HetSNets. While the mmWave physical layer is well understood, major challenges remain for its effective and efficient implementation in HetSNets from an access andnetworking point of view. Toward this end, we introduce a novel but 3GPP backwards-compatible frame structure, based on time-division duplex, which facilitates both high-capacity access and backhaul links. We then discuss networking issues arising from the multi hop nature of the mmWave backhauling mesh. Finally, system-level simulations evaluate the performance of HetSNets with mmWave communications and corroborate the possibility of having capacities of tens of gigabits per second in emerging 5G systems. The fifth generation (5G) network will serve as a key enabler in meeting the continuously increasing demands for future wireless applications, including an ultra-high data rate, an ultrawide radio coverage, an ultra-large number of devices, and an ultra-low latency. This article examines security, a pivotal issue in the 5G network where wireless transmissions are inherently vulnerable to security breaches.book=29,ebook=33Specifically, we focus on physical layer security, which safeguards data confidentiality by exploiting the intrinsic randomness of the communications medium and reaping the benefits offered by the disruptive technologies to 5G. Among various technologies, the three most promising ones are discussed: heterogenous networks, massive multiple-input multiple-output, and millimeter wave. On the basis of the key principles of each technology, we identify the rich opportunities and the outstanding challenges that security designers must tackle. Such an identification is expected to decisively advance the understanding of future physical layer security. Millimeter-wave communication is a promising technology for future 5G cellular networks to provide very high data rate (multi-gigabits-per-second) for mobile devices. Enabling D2D communications over directional mmWave networks is of critical importance to efficiently use the large bandwidth to increase network capacity. In this article, the propagation features of mmWave communication and the associated impacts on 5G cellular networks are discussed. We introduce an mmWave+4G system architecture with TDMA-based MAC structure as a candidate for 5G cellular networks. We propose an effective resource sharing scheme by allowing non-interfering D2D links to operate concurrently. We also discuss neighbor discovery for frequent handoffs in 5G cellular networks. Cost-effective and scalable wireless backhaul solutions are essential for realizing the 5G vision of providing gigabits per second anywhere. Not only is wireless backhaul essential to support network densification based on small cell deployments, but also for supporting very low latency inter-BS communication to deal with inter cell interference. Multiplexing backhaul and access on the same frequency band (in-band wireless backhaul) has obvious cost benefits from the hardware and frequency reuse perspective, but poses significant technology challenges. We consider an in-band solution to meet the backhaul and inter-BS coordination challenges that accompany network densification. Here, we present an analysis to persuade the readers of the feasibility of in-band wireless backhaul, discuss realistic deployment and system assumptions, and present a scheduling scheme for inter-BS communications that can be used as a baseline for further improvement. We show that an in-band wireless backhaul for data backhauling and inter-BS coordination is feasible without significantly hurting the cell access capacities. Heterogeneous small cell networks have attracted much attention for satisfying users' explosive data traffic requirements. The heterogeneous cloud small cell network (HCSNet), which combines cloud computing and a heterogeneous small cell network, will likely play an important role in 5G mobile communication networks. However, with massive deployment of small cells, co-channel interference and handover management are two important problems in an HCSNet, especially for cell edge users. In this article, we examine the problems of cooperative interference mitigation and handover management in an HCSNet. A network architecture is described to combine cloud radio access network with small cells. An effective CoMP clustering scheme using affinity propagation is adopted to mitigate cell edge users' interference. A low-complexity handover management scheme is presented, and its signaling procedure is analyzed in an HCSNet. Numerical results show that with the proposed network architecture, CoMP clustering and handover management schemes can significantly increase the capacity of HCSNet while maintaining users’ quality of service. This article provides an overview on research in energy-efficient wireless networks during the past decade and discusses its potential applications toward the fifth generation cellular systems. After analyzing the trade-off between spectrum efficiency and energy efficiency, various research results are summarized within a framework of energy-efficient resource allocation with optimization as a common tool. Then potential energy efficiency improving approaches in both physical layer and deployment aspects are provided. Finally, energy efficiency related open problems in massive multiple-input multiple-output, device-to-device communications, ultra dense networks, and other emerging technologies are identified. 5G will have to support a multitude of new applications with a wide variety of requirements, including higher peak and user data rates, reduced latency, enhanced indoor coverage, increased number of devices, and so on. The expected traffic growth in 10 or more years from now can be satisfied by the combined use of more spectrum, higher spectral efficiency, and densification of cells. The focus of the present article is on advanced techniques for higher spectral efficiency and improved coverage for cell edge users. We propose a smart combination of small cells, joint transmission coordinated multipoint (JT CoMP), and massive MIMO to enhance the spectral efficiency with affordable complexity. We review recent achievements in the transition from theoretical to practical concepts and note future research directions. We show in measurements with macro-plus-small-cell scenarios that spectral efficiency can be improved by flexible clustering and efficient user selection, and that adaptive feedback compression is beneficial to reduce the overhead significantly. Moreover, we show in measurements that fast feedback reporting combined with advanced channel prediction are able to mitigate the impairment effects of JT CoMP. The evolution toward 5G mobile networks will be characterized by an increasing number of wireless devices, increasing device and service complexity, and the requirement to access mobile services ubiquitously. Two key enablers will allow the realization of the vision of 5G: very dense deployments and centralized processing. This article discusses the challenges and requirements in the design of 5Gmobile networks based on these two key enablers. It discusses how cloud technologies and flexible functionality assignment in radio access networks enable network densification and centralized operation of the radio access network over heterogeneous backhaul networks. The article describes the fundamental concepts, shows how to evolve the 3GPP LTE architecture, and outlines the expected benefits. The evolving fifth generation (5G) cellular wireless networks are envisioned to overcome the fundamental challenges of existing cellular networks, for example, higher data rates, excellent end-to-end performance, and user-coverage in hot-spots and crowded areas with lower latency, energy consumption, and cost per information transfer. To address these challenges, 5G systems will adopt a multi-tier architecture consisting of macro cells, different types of licensed small cells, relays, and device-to-device (D2D) networks to serve users with different quality-of-service (QoS) requirements in a spectrum and energy-efficient manner. Starting with the visions and requirements of 5G multi-tier networks, this article outlines the challenges of interference management (e. g. power control, cell association) in these networks with shared spectrum access (i.e. when the different network tiers share the same licensed spectrum). It is argued that the existing interference management schemes will not be able to address the interference management problem in prioritized 5G multi-tier networks where users in different tiers have different priorities for channel access. In this context a survey and qualitative comparison of the existing cell association and power control schemes is provided to demonstrate their limitations for interference management in 5G networks. Open challenges are highlighted and guidelines are provided to modify the existing schemes in order to overcome these limitations and make them suitable for the emerging 5G systems.

Keywords:multi-hop cellular networks (MCN); opportunistic networking; device-centric wireless; D2D; 5G

來(lái)源出版物：Ad Hoc Networks, 2016, 37: 418-434 聯(lián)系郵箱：Coll-Perales, B; bcoll@umh.es

Large-scale antenna systems with hybrid analog and digital beamforming for millimeter wave 5G

Han, SF; Chih-Lin, I; Xu, ZK; et al.

來(lái)源出版物：IEEE Communications Magazine, 2015, 53(1): 186-194 聯(lián)系郵箱：Han, SF; hanshuangfeng@chinamobile.com

10 Gb/s hetsnets with millimeter-wave communications: Access and networking - challenges and protocols

Zheng, K; Zhao, L; Mei, J; et al.

來(lái)源出版物：IEEE Communications Magazine, 2015, 53(1): 222-231 聯(lián)系郵箱：Zheng, K; zkan@bupt.edu.cn

Safeguarding 5G wireless communication networks using physical layer security

Yang, N; Wang, LF; Geraci, G; et al.

來(lái)源出版物：IEEE Communications Magazine, 2015, 53(4): 20-27 聯(lián)系郵箱：Yang, N; nan.yang@anu.edu.au

Enabling device-to-device communications in millimeter-wave 5G cellular networks

Qiao, J; Shen, XM; Mark, JW; et al.

來(lái)源出版物：IEEE Communications Magazine, 2015, 53(1): 209-215 聯(lián)系郵箱：Qiao, J; qiaojian1@gmail.com

Point-to-multipoint in-band mmWave backhaul for 5G networks

Taori, R; Sridharan, A

來(lái)源出版物：IEEE Communications Magazine, 2015, 53(1): 195-201 聯(lián)系郵箱：Taori, R; rakesh.taori@samsung.com

Cooperative interference mitigation and handover management for heterogeneous cloud small cell networks

Zhang, HJ; Jiang, CX; Cheng, JL; et al.

來(lái)源出版物：IEEE Communications Magazine, 2015, 22(3): 92-99 聯(lián)系郵箱：Zhang, HJ; haijunzhang@ece.ubc.ca

Recent advances in energy-efficient networks and their application in 5G systems

Wu, G; Yang, CY; Li, SQ; et al.

來(lái)源出版物：IEEE Wireless Communications, 2015, 22(2): 145-151 聯(lián)系郵箱：Wu, G; wugang99@uestc.edu.cn

The role of small cells, coordinated multipoint, and massive MIMO in 5G

Jungnickel, V; Manolakis, K; Zirwas, W; et al.

來(lái)源出版物：IEEE Communications Magazine, 2014, 52(5): 44-51 聯(lián)系郵箱：Jungnickel, V; volker.jungnickel@hhi.fraun-hofer.de

Cloud technologies for flexible 5G radio access networks

Rost, P; Bernardos, CJ; De Domenico, A; et al.

來(lái)源出版物：IEEE Communications Magazine, 2014, 52(5): 68-76 聯(lián)系郵箱：Rost, P; peter.rost@neclab.eu

Evolution toward 5G multi-tier cellular wireless networks: An interference management perspective

Hossain, E; Rasti, M; Tabassum, H; et al.

來(lái)源出版物：IEEE Wireless Communications, 2014, 21(3): 118-127

編輯：王微

領(lǐng)跑者5000論文

來(lái)源出版物：中興通訊技術(shù), 2014, 20(2): 5-10