WiFiUS: Device-to-Device Communications at Millimeter-Wave Frequencies

WiFiUS：毫米波频率的设备到设备通信

• 批准号: 1457340
• 负责人: Andreas Molisch
• 金额: $ 28万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-02-01 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1457340&HistoricalAwards=false
• 关键词: WiFiUS; Device; Communications; Millimeter; Wave

The dramatic increase in traffic - both aggregate, and peak traffic per user - will soon outpace the capabilities of current cellular systems like LTE. To cope with the increased requirements, new systems need to be developed that both exploit the use of new spectrum, and new radio access methods. An especially promising method with those features is device-to-device (D2D) communications operating at millimeter-wave frequencies. D2D communications exploits the fact that in many situations, such as in social networks, two devices that want to communicate are in close proximity to each other. While such devices could talk to each other via infrastructure nodes, it is much more spectrally efficient to enable direct communications between the devices, especially for inter-device distances much smaller than the cell radius; this also enables higher data rates. Further data rate increases can be obtained by exploiting the large swatch of new spectrum in the millimeter-wave frequency bands. The use of millimeter-wave frequencies for WiFi-like systems is has already been standardized and first products are reaching the market. Furthermore, millimeter-wave links are now also considered for wireless access, i.e., connection from a mobile cellphone to a base station or access point. Recently, cellphone manufacturers have demonstrated prototypes of handsets with millimeter-wave transceivers and adaptive antennas, showing the practical viability for mobile applications. This opens up the possibilities for millimeter-wave based D2D systems as well.This project will investigate fundamental questions of realizing D2D communications at millimeter-wave frequencies. Critically, such systems are not simply "regular D2D systems operating at higher frequencies"; rather, new and important challenges arise in the context of channel modeling, link setup, link adaptation, and robustness. To solve these, we tackle the following 4 main challenges: (i) measurement of D2D propagation channels at mm-wave frequencies, using innovative measurement techniques and evaluations such as laser-scanning based ray tracing; (ii) neighbor discovery, i.e., finding which devices can talk to each other, taking into account the directional nature of the device antennas; (iii) dynamic beamforming and beamtracking, which integrates a key property of millimeter-wave channels that the directions of the strongest multipath components can change rapidly; and (iv) capacity and reliability investigations. Results from this project will form the basis for systems that support wireless high-speed connections, as are relevant for video conferences, real-time gaming, situational awareness, and many others. Equally importantly, by offloading resource-consuming connections, cellular resources are freed up for other applications.

流量的急剧增长-无论是聚合流量还是每个用户的峰值流量-都将很快超过当前蜂窝系统（如LTE）的能力。 为了科普增加的需求，需要开发既利用新频谱的使用又利用新无线电接入方法的新系统。具有这些特征的特别有前途的方法是在毫米波频率下操作的设备到设备（D2 D）通信。D2 D通信利用了以下事实：在许多情况下，诸如在社交网络中，想要通信的两个设备彼此非常接近。虽然这些设备可以通过基础设施节点相互通信，但在设备之间实现直接通信的频谱效率要高得多，特别是对于远小于小区半径的设备间距离;这也可以实现更高的数据速率。通过利用毫米波频带中的大样本新频谱，可以获得进一步的数据速率增加。毫米波频率在类似WiFi系统中的使用已经标准化，首批产品正在进入市场。此外，毫米波链路现在也被考虑用于无线接入，即，从移动的蜂窝电话到基站或接入点的连接。 最近，手机制造商展示了带有毫米波收发器和自适应天线的手机原型，显示了移动的应用的实际可行性。这也为基于毫米波的D2 D系统开辟了可能性。本项目将研究在毫米波频率下实现D2 D通信的基本问题。重要的是，这样的系统不仅仅是“在更高频率下操作的常规D2 D系统”;相反，在信道建模、链路建立、链路自适应和鲁棒性的上下文中出现了新的和重要的挑战。为了解决这些问题，我们解决了以下4个主要挑战：（i）使用创新的测量技术和评估（例如基于激光扫描的射线跟踪）来测量毫米波频率下的D2 D传播信道;（ii）邻居发现，即，考虑到设备天线的方向性，找出哪些设备可以彼此通话;（iii）动态波束成形和波束跟踪，其集成了毫米波信道的一个关键特性，即最强多径分量的方向可以迅速改变;以及（iv）容量和可靠性调查。 该项目的成果将为支持无线高速连接的系统奠定基础，这些系统与视频会议、实时游戏、态势感知等许多领域相关。同样重要的是，通过卸载消耗资源的连接，蜂窝资源被释放用于其他应用。