基于5G技术的无线通信系统设计

5G技术是一种全新的无线通信技术，其通过高频带、低时延、大容量优势以及强大的连接能力等优势，实现了快速的数据传输和更好的用户体验。其关键技术包括MIMO（多输入多输出）技术、Beamforming技术、超密集波束技术等。这些技术的应用可以大大提高无线通信系统的吞吐量和传输效率。文中主要分析了基于5G技术的无线通信系统的架构、发射端和接收端的设计，以期为用户提供更加高效、可靠的无线通信服务。     

5G网络中NSA控制面和用户面时延性能分析

不同于2G/3G/4G的独立组网，5G的网络架构分为两种：非独立（NSA）组网和独立（SA）组网。NSA作为非独立架构，能实现5G的快速部署。低时延是5G非常重要的特点，其实现需要一系列技术的有机结合。针对2.6 GHz NR帧结构，结合理论分析和实际案例数据，研究了NSA架构下控制面时延和用户面时延的现状和问题：当前，商用芯片级别的终端控制面时延约为359～510 ms；，开启预调度功能时，NSA好点空口双向用户面时延为11～14 ms，关闭预调度后，用户面时延增加至15～17 ms。为了进一步优化控制面时延性能，可采用设置NSA的锚点与NR子帧同步、将B1的timetotrigger设置得略小等方案；而采取SR周期自适应方式则可以降低用户面时延。并给出了时延优化方案，给NSA网络部署提供了相应的思路和建议。     

基于5G的MEC网络架构与部署策略

多接入边缘计算(MEC)为5G网络必不可少的网元,实现本地化泄流与云服务提供,解决现有网络垂直封闭烟囱式架构不能满足低时延、高带宽等业务需求问题,降低网络传输投资.基于ETSI与3GPP的5G网络进展,提出MEC网络架构与传统无线接入、传输、承载等网络架构融合,使业务面下沉本地化不同场景部署.结合广州实际情况,对本地化...     

浅析5G移动通信的关键技术及发展

【】2017年,全球多家移动通信企业宣布将共同支持加速5G新空口(5G NR)标准化进程,以推动于2019年尽早实现5G新空口的大规模试验和部署。为相应5G部署号召,现积极开展5G专题研究。通过简要回顾4G通信系统的兴起,引出5G概念并对其关键技术进行总结分析,同时对比4G与5G在指标能力上、技术对比上及应用场景上的差异,从而预估未来5G网络的发展方向。希望通过对5G移动通信若干关键技术浅析和与4G的差异化对比的探讨,为移动通信人员提供一些可行性的基础。     

Media Independent Mobility Management for D2D Communications over Heterogeneous Networks (HetNets)

The rapid growth of traffic demand and innovation of mobile networks have pushed the current communication infrastructure to provide a tight integration of different wireless technologies. On the one hand, all user connections are expected to be heterogeneous in future networks and thus an intelligent mobility management is essential to satisfy the requirements of lower latency, less power consumptions and last but not least possible uninterrupted ongoing session when a User Equipment (UE) moves across network boundaries. On the other hand, Device-to-Device (D2D) communication as a revolutionary technology to enhance network performance has shown a great potential in dominating future communication market. Consequently, in this paper, we investigate the mobility management problem for D2D communications in heterogeneous networks. We leverage on IEEE 802.21 Media Independent Service (MIS) and propose a new framework, so-called enhanced version of IEEE 802.21 MIS that supports D2D communication (E-MIS-D2D) to enhance D2D mobility experience over heterogeneous networks. The E-MIS-D2D is a network assisted and initiated architecture, in which a load-aware mode selection algorithm is also proposed for selecting the transmission mode between D2D and non-D2D modes. Through extensive simulations, we validate that the proposed method outperforms the existing methods in terms of packet loss ratio, average throughput, latency, bandwidth usage and load rate of eNB.

     

Improving caching resource management: A pricing economic approach using Cournot,Bertrand, and Stackelberg game models

Over-The-Top broadcasts a huge number of medias that mobile network operators have to manage efficiently before to deliver it to their subscribers. We propose an economic pricing approach to address caching resource management issues in the 5G wireless networks and to overcome limitations in terms of throughput, latency, and reliability. Moreover, we consider this approach based on an oligopolistic multi-market deducted from Cournot, Stackelberg, and Bertrand models. For simulation purpose, we consider the routing protocol (Ad-hoc On-Demand Distance Vector [AODV]) commonly used for the wireless network. We use the NS-2 package, and we analyze results in terms of End-to-End delay representing latency, throughput, packet delivery ratio, and normalized network load.     

20MHz动态频谱共享的组网性能分析与验证

动态频谱共享(DSS, Dynamic Spectrum Sharing)在有限的频谱资源下部署4G/5G网络协同,实现4G向5G平滑演进,同时利用低频段实现5G网络广覆盖等方面具有重要意义,虽然DSS技术有以上诸多优点,但在组网中引入DSS的同时会引入异系统间的诸多干扰影响组网性能。通过对DSS的技术方案进行分析,对DSS组网下的多种通信制式的性能基于开销计算的方式进行理论评估,并在室外布置20个基站的实验场地,先通过DSS组网下的定点测试来验证异系统间干扰对各个通信制式性能的影响,最后通过拉网测试给出DSS组网下各种通信制式的吞吐量。目前尚没有对20 MHz DSS的组网性能进行实验验证的文献,对于频谱资源紧张需要在Sub 3 GHz下部署4G/5G协同组网的运营商具有参考价值。     

Latest progress on 3.5 GHz 5G NR trial

The 5^thgeneration mobile system (5G) was designed to fulfill the mobile market requirements for higher data rate,lower latency and higher connection density beyond 2020.3.5 GHz spectrum was a typical band for 5G deployment and could be a global band for 5G development.The performance of 3.5 GHz 5G would be very meaningful as a reference for global operators.Based on the first release of 5G specification frozen in June 2018 by 3^rdgeneration partner project (3GPP),field trials of 5G network in typical urban area were conducted to validate the peak data rate,cell throughput and latency of 5G network.The trial results show that 5G NR system can achieved 1 Gbit/s peak data rate and 4 ms latency of single direction.     

5G关键技术探究

用户需求数据业务及智能终端的普及,致使4G网络在容量、速率、承载及频谱等方面不能满足人们对网络的需求,因此,5G网络伴随历史的潮流迎面而来。首先回顾移动通信近年来的发展历史,总结出符合应用的5G网络结构,包括无线接入云、智能开放的控制云、高效低成本的转发云3个域,该架构具有容量大、速率高、低延时的优势;其次在该构架基础上论述5G的四大潜在技术：覆盖增强技术、频效提升技术、频谱扩展技术及能效提升技术;最后总结5G技术的优势特点,同时叙述了未来研究存在的挑战。     

基于LTE D2D技术的车联网通信架构与数据分发策略研究

基于5G通信技术的车联网面临高速率、低时延、高可靠性和大量流媒体数据分发等需求,提出了一种基于LTE D2D的车联网通信架构,设计基于运动一致性的车辆分簇算法,有效增加持续D2D通信时间,提高通信可靠性;其次,针对簇内车辆的流媒体数据分发,提出一种带时延约束的D2D协作中继转发策略,设计最优中继选择算法,大幅提高数据传输速率,提升网络吞吐量。     

大数据在5G无线通信中的应用

5G 网络技术与大数据技术形成了紧密的互补关系,两种技术优势互补,相得益彰。大数据与 5G 通信是两个相对独立的技术模块,但它们都是信息时代的产物。5G通信网络具有高带宽、大容量、高吞吐量、低时延等特点,而大数据具有强大的采集、存储、处理等功能,可以实现海量信息的传输和处理,实现深层次的信息价值检索。因此,大数据在 5G 通信网络中的应用成了一种的重要发展趋势,文中对此进行了深入讨论,对两者的融合发展关系进行了分析,以提升现代信息技术的应用价值。     

5G行业专网组网方案和关键技术研究

5G通信技术具有大规模互联、低时延、高性能等特征,其与AI、边缘计算等技术的结合,有利于促进工业互联网的智能化发展。基于此,文中从工业系统构造改革着手,结合5G通信技术和工业互联网,全面分析了5G工业专网融合网络架构,如算力分布式、未来无线化、异构接入等,并提出了以业务感知层、网络资源层、网业协同层等构成的完整的网络逻辑架构。同时,文中研究了5G行业专网的组网方案和关键技术,对现阶段存在的一些问题进行了讨论,为相关领域提供了借鉴。研究发现,结合了5G通信技术和工业专网的组网方案,能提高5G行业专网组网方案的应用效果,促进工业结构的数字化转型,实现相关企业的可持续发展。     

Towards the fulfillment of 5G network requirements: technologies and challenges

Future 5G networks are expected to have the capabilities of providing extremely high data rates, seamless coverage, massive number of connected devices, low latency, etc., in order to support the internet of things era. The dynamic performance of 5G networks is a key feature for controlling the dense and rapidly changing communication environment. Technical issues such as limited frequency resources, interference, energy consumption, and network management are the main challenges facing 5G networks. This article presents a comprehensive study of 5G networks architecture, technologies, challenges, and possible solutions based on recent advances in technology and research.     

5G无线网上行覆盖增强技术探讨

5G NR主流频段为3.5GHz(C-band),下行覆盖能力与4G LTE相当,但上行受终端天线数量和发射功率限制,覆盖能力有限,上下行覆盖严重不平衡。在阐述5G NR网络总体架构的基础上,详细分析了双连接(DC)、上下行解耦(SUL)、超级上行(Super UL)、下行载波聚合(DL CA)和上行载波聚合(UL CA)等上行覆盖增强技术的原理及特点,对比总结了各技术的优势与不足,并对上行覆盖增强技术的应用进行了展望。     

An intra–inter-cell device-to-device communication scheme to enhance 5G network throughput with delay modeling

As the number of mobile users is growing, so is the demand for more bandwidth. It becomes important that the required bandwidth and spectral resources do not scale with traffic in the next generation of wireless networks [i.e. fifth generation (5G)]. Device-to-device (D2D) communication underlaying cellular networks has been recognized as an essential technique in 5G networks. By applying definite principles and strategies, D2D communication not only increases the spectral and energy efficiency, but also enhances network throughput, network coverage and reduces delay. In this paper, we present an intra–inter-cell D2D communication scheme to enhance throughput of 5G networks. We study call setup delay of two developed communication scenarios and throughput gain comparing three systems. Firstly, we show the enhancements required in current cellular architectures to support inter-cell D2D communication. We develop protocols for two scenarios and demonstrate how architecture entities cooperate for the call setup between D2D users. We measure the overall call setup time for the developed protocols and derive a closed-form delay formula to estimate call setup time probability. Secondly, we perform simulations using a topology similar to that found in realistic urban environments to study throughput gains of the proposed intra–inter-cell D2D communication scheme. We compare three systems in terms of throughput: (1) pure cellular system (with cellular users only), (2) pure cellular system with intra-cell D2D users sharing the same cellular resource, and (3) pure cellular system with intra–inter-cell D2D users sharing the same cellular resource. Simulation results show that the proposed scheme substantially increases the network throughput and spectrum efficiency.     

5G标准化进展介绍及网络架构浅析

互联网的迅速发展,促使着信息爆炸时代的到来.第四代移动通信(4G)中采用的LTE系统已逐渐难以满足不断涌现出来的新业务需求,第五代移动通信技术(5G)正在快速发展.为满足更加丰富的通信需求,5G需要在4G的基础上开发出新的网络架构.本文对5G的特点、推进情况及新型网络架构相关技术进行了介绍.     

Green Architecture for Dense Home Area Networks Based on Radio-over-Fiber with Data Aggregation Approach

The high-density population leads to crowded cities. The future city is envisaged to encompass a large-scale network with diverse applications and a massive number of interconnected heterogeneous wireless-enabled devices. Hence, green technology elements are crucial to design sustainable and future-proof network architectures. They are the solutions for spectrum scarcity, high latency, interference, energy efficiency, and scalability that occur in dense and heterogeneous wireless networks especially in the home area network (HAN). Radio-over-fiber (ROF) is a technology candidate to provide a global view of HAN's activities that can be leveraged to allocate orthogonal channel communications for enabling wireless-enabled HAN devices transmission, with considering the clustered-frequency-reuse approach. Our proposed network architecture design is mainly focused on enhancing the network throughput and reducing the average network communications latency by proposing a data aggregation unit (DAU). The performance shows that with the DAU, the average network communications latency reduces significantly while the network throughput is enhanced, compared with the existing ROF architecture without the DAU.     

Low-cost and low-power unidirectional torus network-on-chip with corner buffer power-gating

Network-on-chip (NoC) is one of critical communication architectures for the scaling of future many-core processors. The challenge for on-chip network is reducing design complexity to save both area and power while providing high performance such as low latency and high throughput. Especially, with increase of network size, both design complexity and power consumption have become the bottlenecks preventing proper network scaling. Moreover, as technology continuously scales down, leakage power takes up a larger fraction of total NoC power. It is increasingly important for a power-efficient NoC design to reduce the increasing leakage power. Power-gating, as a representative low-power technique, can be applied to an on-chip network for mitigating leakage power. In this paper, we propose a low-cost and low-power router architecture for the unidirectional torus network, and adopt an improved corner buffer structure for the inoffensive power-gating, which has minimal impact on network performance. Besides, an explicit starvation avoidance mechanism is introduced to guarantee injection fairness while decreasing its negative impact on network throughput. Simulation results with synthetic traffic show that our design can improve network throughput by 11.3% on average and achieve significant power-saving in low- and medium-load regions. In the SPLASH-2 workload simulation, our design can save on average 27.2% of total power compared to the baseline, and decrease 42.8% average latency compared to the baseline with power-gating.     

基于5G技术的远海通信网络建设与优化研究

随着信息技术的不断发展和应用,远海通信的需求越来越强烈。传统的通信网络存在诸多限制,如带宽、延迟、安全等,5G技术的出现为远海通信带来了全新的发展机遇。文中介绍了5G技术的概念和优势,探讨了5G技术在远海通信中的应用场景、优势和存在的挑战,并提出了基于5G 技术的远海通信网络建设方案,包括网络架构、设备选型、安全设计、组网设计和安全保障。最后,详细探讨了基于5G技术的远海通信网络建设与优化,以期为推进远海通信技术的创新和发展提供参考。     

Development of Energy Efficient Image/Video Sensor Networks

Image/Video Sensor Networks are emerging applications for sensor network technologies. The relatively high energy consuming image capturing process and the large size of the data collected by image/video sensors presents new challenges for the sensor network in terms of energy consumption and network capacity. We propose to address these issues through the use of a high density network deployment. A high density network allows network nodes to conserve power by reducing their transmission power and simultaneously increases the potential for spatially concurrent transmissions within the network, resulting in improved network throughput. Furthermore, with the use of additional relay nodes, we allow a communication density that differs from the sensing density. A higher communication density has the potential to further increase the spatially concurrent transmission. Moreover, this reduces the relay burden of the sensor node, thus conserving sensor energy. In this work, we show analytically how a high density network design effectively improves energy consumption and network capacity. Furthermore, we discuss the constraints placed on a high density sensor network deployment due to application latency requirements, sensor coverage requirements, connectivity requirements, and node costs.