GLOBECOM 2020 - 2020 IEEE Global Communications Conference最新文献

Altitude Optimization for DF Relaying Trajectory of UAV in Cooperative FANET 协同FANET中无人机DF中继轨迹高度优化

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322461

Anirudh Agarwal, Deepak Mishra

{"title":"Altitude Optimization for DF Relaying Trajectory of UAV in Cooperative FANET","authors":"Anirudh Agarwal, Deepak Mishra","doi":"10.1109/GLOBECOM42002.2020.9322461","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9322461","url":null,"abstract":"Advent of unmanned aerial vehicle (UAV) as relay in ad-hoc networks has offered numerous promising communication solutions with both military and civilian applications. Additionally with more degrees of freedom, mobile UAV relaying provides better susceptibility to changing environment conditions thereby enhancing the network performance. However, optimization of UAV altitude is a primary concern in such flying ad hoc networks (FANETs). In this work, we consider a three node decode-and-forward (DF) FANET, and the aim is to minimize the average network outage probability subject to practical mobility constraints of maximum UAV velocity and minimum allowable UAV height, thereby finally optimizing the overall UAV trajectory (UT). In particular, for pre-determined initial and final relay positions, we first prove convexity of the optimization problem and then obtain the semi-closed-form globally optimal UT solution. The analysis is numerically validated along with the discussion of multiple optimal design insights. Results reveal the respective average performance gain of 56% and 37% over the two benchmark schemes.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"60 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73551090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Content Caching and Allocation in Spatially Correlated Small Cells 空间相关小单元的内容缓存和分配

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322455

K. S. Khan, Noman Haider, A. Jamalipour

{"title":"Content Caching and Allocation in Spatially Correlated Small Cells","authors":"K. S. Khan, Noman Haider, A. Jamalipour","doi":"10.1109/GLOBECOM42002.2020.9322455","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9322455","url":null,"abstract":"Optimal content caching has been an important topic in dense small cell networks. Due to spatial and temporal variation in the popularity of data, most content requests cannot be directly served by the lower tiers of the network, increasing the chances of congestion at the core network. This raises the issues of what to cache and where to cache, especially for content with different popularity patterns in a given region. In this work, we focus on the issue of redundant caching of popular files in a cluster when designing a content allocation scheme. We formulate the considered problem as a stable matching theory problem, where the preferences of each cache entity are sent to the Macro Base Station (MBS) for stable matching. The caches share their request lists with the MBS, which subsequently uses Irving One-Sided matching algorithm to generate a unique preference list for each caching entity such that every preference list is a representative of the popular data in that region. The algorithm achieves the desired goal of efficient caching with few but smartly planned repetitions of the popular files. Results show that our proposed scheme provides better performance in terms of cache hit ratio with increasing number of requests as compared to a popularity based scheme.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"45 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73806740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Iterative Power Allocation and Access Point Scheduling in Uplink Cell-Free Massive MIMO Systems 无上行小区大规模MIMO系统的迭代功率分配和接入点调度

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322341

M. Guenach, A. Gorji, A. Bourdoux

引用次数: 1

On the Energy Consumption and Ranging Accuracy of Ultra-Wideband Physical Interfaces 超宽带物理接口的能耗与测距精度研究

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9347984

Laura Flueratoru, S. Wehrli, M. Magno, D. Niculescu

{"title":"On the Energy Consumption and Ranging Accuracy of Ultra-Wideband Physical Interfaces","authors":"Laura Flueratoru, S. Wehrli, M. Magno, D. Niculescu","doi":"10.1109/GLOBECOM42002.2020.9347984","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9347984","url":null,"abstract":"Ultra-wideband (UWB) communication is attracting increased interest for its high-accuracy distance measurements. However, the typical current consumption of tens to hundreds of mA during transmission and reception might make the technology prohibitive to battery-powered devices in the Internet of Things. The IEEE 802.15.4 standard specifies two UWB physical layer interfaces (PHYs), with low- and high-rate pulse repetition (LRP and HRP, respectively). While the LRP PHY allows a more energy-efficient implementation of the UWB transceiver than its HRP counterpart, the question is whether some ranging quality is lost in exchange. We evaluate the trade-off between power and energy consumption, on the one hand, and distance measurement accuracy and precision, on the other hand, using UWB devices developed by Decawave (HRP) and 3db Access (LRP). We find that the distance measurement errors of 3db Access devices have at most 12 cm higher bias and standard deviation in line-of-sight propagation and 2–3 times higher spread in non-line-of-sight scenarios than those of Decawave devices. However, 3db Access chips consume 10 times less power and 125 times less energy per distance measurement than Decawave ones. Since the LRP PHY has an ultra-low energy consumption, it should be preferred over the HRP PHY when energy efficiency is critical, with a small penalty in the ranging performance.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"29 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74423351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Ranging Estimation Error in WiFi Devices Running IEEE 802.11mc 运行IEEE 802.11mc的WiFi设备测距误差分析

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9347973

I. Martín-Escalona, E. Zola

引用次数: 10

Computation-Aided Data Transmission for Remote Reconstruction of Trajectories of Dynamical Systems 动力系统轨迹远程重建的计算辅助数据传输

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322547

Siyuan Yu, Yawei Lu, W. Chen

{"title":"Computation-Aided Data Transmission for Remote Reconstruction of Trajectories of Dynamical Systems","authors":"Siyuan Yu, Yawei Lu, W. Chen","doi":"10.1109/GLOBECOM42002.2020.9322547","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9322547","url":null,"abstract":"Remote reconstruction of trajectories of dynamical systems is now emerging as a mission-critical application in Industry 4.0 and beyond. Unfortunately, the statistical properties of signals generated by dynamical systems usually remain unknown, which prohibits the use of classic source coding methods relying on a statistical source model. To overcome this difficulty, we present a paradigm shift data transmission scheme, assuring that the reconstruction error is limited with the aid of the computation unit. It is found that the bit rate for transmitting trajectories has a significant relationship with the predictability of dynamical systems. Together with the concept of the Lyapunov exponent, an error growth function is introduced in this paper to classify the dynamical systems according to their predictability. A general expression of the bit rate is obtained in this paper. Furthermore, it is shown that the asymptotic value of the bit rate to reconstruct trajectories of a chaotic system is given by its Lyapunov exponent. The bit rate to reconstruct trajectories of non-chaotic systems is also presented. Simulation results show that our scheme outperforms conventional information-theory-based coding schemes, and can significantly reduce bandwidth requirements.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"254 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73213086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Uplink Reference Signal Based Handover with Mobile Relay Node Assisted User Clustering 基于上行参考信号的移动中继节点辅助用户聚类切换

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322218

M. Tayyab, G. Koudouridis, X. Gelabert, R. Jäntti

{"title":"Uplink Reference Signal Based Handover with Mobile Relay Node Assisted User Clustering","authors":"M. Tayyab, G. Koudouridis, X. Gelabert, R. Jäntti","doi":"10.1109/GLOBECOM42002.2020.9322218","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9322218","url":null,"abstract":"In today’s cellular networks, an increasing number of connected devices on-board in fast-moving vehicles would require more efficient handover (HO) procedures. To this end, we investigate the utilization of mobile relay nodes (MRNs) in vehicles to facilitate efficient HO and HO-related power consumption reductions for all on-board user equipments (UEs). In particular, the potential gains in terms of HO rate, HO failure ratio (HOFR), ping-pong (PP) rate, and total power consumption are studied for different UE cluster sizes. To eliminate the measurement power-consuming procedure, uplink (UL) reference signals (RS) transmitted by UEs are exploited. Four different case scenarios are simulated utilizing both the DL and UL RS based HO procedure, with and without deploying MRNs on the buses traveling along the cell edges of surrounding macro BSs. Simulation results indicate that the UL RS based HO procedure can improve HO performance significantly because it reduces the air-interface signaling messages, namely the measurement report (MeasReport) transmission and reception. Also, in terms of power consumption, deploying MRNs is a more attractive solution with substantial power reduction for onboard UEs of higher cluster size.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"217 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74175302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Max-Min Fairness in IRS-Aided MISO Broadcast Channel via Joint Transmit and Reflective Beamforming 联合发射和反射波束形成的irs辅助MISO广播信道最大最小公平性

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9348016

Caihong Kai, Wenqi Ding, W. Huang

{"title":"Max-Min Fairness in IRS-Aided MISO Broadcast Channel via Joint Transmit and Reflective Beamforming","authors":"Caihong Kai, Wenqi Ding, W. Huang","doi":"10.1109/GLOBECOM42002.2020.9348016","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9348016","url":null,"abstract":"The potential application of intelligent reflecting surfaces (IRSs) for future wireless cellular communication systems has motivated the study of metasurface for achieving additional space degree of freedom, where IRS is used to enhance the desired signal strength and suppress the interference. In this paper, by using the additional design degree of freedom provided by the IRS, we jointly optimize the transmit beamforming vector at the BS and the reflective beamforming vector at the IRS to maximize the minimum rate in the IRS-aided multi-user multiple-input-single-output broadcast channel (MISO-BC), subject to the unit modulus constraints of the reflective beamforming vector. In order to solve the non-convex optimization problem, we propose an efficient algorithm based on alternating optimization. In particular, we optimize the transmit beamforming vectors via the second-order cone problem (SOCP) and reflective beamforming vector by using the semi-definite relaxation (SDR). Numerical results show that the use of IRS leads to significant higher SINR values than benchmark schemes without IRS.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"213 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74354603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Resource Allocation based on Graph Neural Networks in Vehicular Communications 基于图神经网络的车载通信资源分配

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322537

Ziyan He, Liang Wang, Hao Ye, Geoffrey Y. Li, B. Juang

引用次数: 21

Location-Based Timing Advance Estimation for 5G Integrated LEO Satellite Communications 基于位置的5G综合LEO卫星通信时序预估

GLOBECOM 2020 - 2020 IEEE Global Communications Conference Pub Date : 2020-12-01 DOI: 10.1109/GLOBECOM42002.2020.9322428

Wenjin Wang, Tingting Chen, Rui Ding, G. Seco-Granados, Li You, Xiqi Gao

{"title":"Location-Based Timing Advance Estimation for 5G Integrated LEO Satellite Communications","authors":"Wenjin Wang, Tingting Chen, Rui Ding, G. Seco-Granados, Li You, Xiqi Gao","doi":"10.1109/GLOBECOM42002.2020.9322428","DOIUrl":"https://doi.org/10.1109/GLOBECOM42002.2020.9322428","url":null,"abstract":"Integrated satellite-terrestrial communications networks aim to exploit both the satellite and the ground mobile communications and thus provide genuine ubiquitous coverage. For 5G integrated low earth orbit (LEO) satellite communication (SatCom) systems, the timing advance (TA) is required to be estimated in the initial random access procedure of communications in order to facilitate the uplink frame alignment among different users. However, due to the inherent characteristics of LEO SatCom systems, the existing 5G terrestrial uplink TA scheme is not applicable in the satellite networks. In this paper, we investigate location-based TA estimation for 5G integrated LEO SatCom systems. We propose to take the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements obtained in the downlink timing and frequency synchronization phase for geographical location estimation, which are made from the satellite at different time instants. The location estimation is then formulated as a quadratic optimization problem. We propose an approximation method based on iteratively performing a linearization procedure on the quadratic equality constraints to solve this problem. Numerical results show that the proposed method can effectively assure uplink frame alignment among different users in typical LEO SatCom systems.","PeriodicalId":12759,"journal":{"name":"GLOBECOM 2020 - 2020 IEEE Global Communications Conference","volume":"7 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72711049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23