项目来源

日本学术振兴会基金(JSPS)

项目主持人

シャオ チョンロン

项目受资助机构

九州工業大学

立项年度

2024

立项时间

未公开

项目编号

24K20765

项目级别

国家级

研究期限

未知 / 未知

受资助金额

4680000.00日元

学科

情報ネットワーク関連

学科代码

未公开

基金类别

若手研究

关键词

LoRaWAN ; Signal collision ; Coexistence ; Physical layer ; LPWANs

参与者

未公开

参与机构

九州工業大学，大学院情報工学研究院

项目标书摘要：The research objectives for the first year include:(1)building an outdoor LoRaWAN testbed to observe packet exchanges and signal collisions among LoRaWAN end devices;(2)designing a signal processing algorithm to resolve LoRaWAN signal collisions.For objective(1),I have successfully implemented a practical LoRaWAN system.This was achieved using a notebook computer as the LoRaWAN network server,a USRP N210 software-defined radio as the LoRaWAN gateway,and multiple Dragino LoRa Shields as LoRaWAN end devices.By deploying customized programs for signal transmission and reception on both the gateway and end devices,I established a functional LoRaWAN testbed on a university campus.This setup allowed me to observe and confirm signal collisions among the end devices.For objective(2),I developed several physical-layer solutions for resolving signal collisions.These solutions have been validated and presented in international conferences and journals.Additionally,I have leveraged LoRaWAN signals to develop an application for detecting close physical contact between devices,demonstrating the versatility of the proposed solutions.This research focuses on developing a novel LoRaWAN(long-range wide area network)architecture to support diverse location-based services.The proposed architecture aims to enhance device networking and location sensing performance.In the first year,the primary objective was to design a sophisticated signal processing algorithm to resolve LoRaWAN signal collisions among coexisting end devices.To facilitate this,I established an outdoor LoRaWAN testbed on a university campus.The setup included a notebook computer functioning as a LoRaWAN network server,a USRP N210 software-defined radio serving as a LoRaWAN gateway,and multiple Dragino LoRa Shields acting as LoRaWAN end devices.Using this testbed,I successfully demonstrated packet exchanges and identified signal collision issues.To improve signal resilience,I devised several physical-layer solutions,testing their feasibility and robustness with the testbed.These findings have been presented at multiple international conferences.Additionally,I authored a comprehensive paper reviewing the latest physical-layer solutions for resolving LoRaWAN signal collisions.Beyond physical-layer research,I conducted preliminary experiments to address medium access control(MAC)-layer challenges in LoRaWAN.This work resulted in a publication proposing improvements to energy fairness among end devices during channel access.Furthermore,I designed a close physical contact detection technique to identify when two LoRaWAN end devices are in proximity,broadening the potential applications of the proposed architecture.In the second year,this research will expand to an outdoor environment,such as an urban area,with a larger LoRaWAN deployment.The testbed will involve more LoRaWAN end devices and replace software-defined radios with commodity LoRaWAN gateways.Using this expanded testbed,I plan to design a data link-layer solution to ensure network connectivity for end devices located in dead-zone areas(e.g.,deep inside buildings or basements).This will be achieved in a zero-effort manner by leveraging a single-antenna gateway,in contrast to existing approaches that rely on multi-antenna gateways.The proposed solution will employ a novel technique that utilizes the redundancy of chirp signals in a LoRaWAN signal to improve the demodulation of signals transmitted from dead-zone end devices.In addition,I will address challenges related to sensing the locations of LoRaWAN end devices.To enhance location sensing accuracy,I will integrate multiple signal-path-related parameters,including time of flight(ToF),time difference of arrival(TDoA),and angle of arrival(AoA).The final device location will be determined through an adaptive fusion of results obtained from these parameters,ensuring higher precision in location estimation.Reason:The research objectives for the first year include:(1)building an outdoor LoRaWAN testbed to observe packet exchanges and signal collisions among LoRaWAN end devices;(2)designing a signal processing algorithm to resolve LoRaWAN signal collisions.For objective(1),I have successfully implemented a practical LoRaWAN system.This was achieved using a notebook computer as the LoRaWAN network server,a USRP N210 software-defined radio as the LoRaWAN gateway,and multiple Dragino LoRa Shields as LoRaWAN end devices.By deploying customized programs for signal transmission and reception on both the gateway and end devices,I established a functional LoRaWAN testbed on a university campus.This setup allowed me to observe and confirm signal collisions among the end devices.For objective(2),I developed several physical-layer solutions for resolving signal collisions.These solutions have been validated and presented in international conferences and journals.Additionally,I have leveraged LoRaWAN signals to develop an application for detecting close physical contact between devices,demonstrating the versatility of the proposed solutions。Outline of Research at the Start:This research aims to provide an LPWAN architecture with a codesign of device networking and location sensing for various location-based service(LBS)support.The objectives of device networking are:(1)signals should feature a high reception ratio under signal collisions;(2)dead-zone end devices should receive the same level of network connectivity as general ones.The objectives of location sensing are:(1)the sensed locations of LPWAN end devices should be as accurate as required by most LPWAN-based LBS;(2)severe battery drain at end devices should be averted。