研究者詳細 - 野林　大起

論文 - 野林　大起

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Performance Evaluation of the Impact between IEEE 802.11ah and Private LoRa Using 920 MHz Band 査読有り

Takeuchi Y., Nobayashi D., Ikenaga T.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 1104 - 1105 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

IEEE 802.11ah (11ah) is a wireless LAN standard using the 920 MHz band and is expected to be used in the IoT field as one of the Low Power Wide Areas (LPWAs). Many LPWAs share the 920 MHz band and are characterized by low transmission rates but long-range communication. Therefore, there is a high possibility of contending communication in the real-world environment. In this study, we clarify the characteristics of contending communications between 11ah and LoRa according to evaluating the performance using real devices.

DOI： 10.1109/CCNC51664.2024.10454837

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Poster: TCP Congestion Control based on Transmission Rate of Wireless LAN Interfaces 査読有り国際誌

Okada A., Nobayashi D., Ikenaga T.

Proceedings - International Conference on Network Protocols, ICNP 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

TCP congestion control uses end-to-end delay and packet discard information to control the transmission rate. In the wireless LAN, there is a time lag between TCP congestion control and the transmission rate control of the wireless LAN interfaces, and there is no coordination between the respective controls. Thus, congestion control corresponding to the current state of the wireless network can be achieved by shortening this time lag. Therefore, this paper proposes a method to control the congestion window by detecting changes in the transmission rate of the wireless LAN interfaces. Our proposed method enables to control congestion windows size by using data link layer information, instead of using only transport layer information. This paper verified the effectiveness of the proposed method by network simulator ns-3.40.

DOI： 10.1109/ICNP61940.2024.10858575

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85218031359&origin=inward

Performance Evaluation of Dynamic Transmission Parameter Control Method for Mobile Terminal with 920 MHz LoRa Communication 査読有り国際誌

Tanaka R., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Low Power Wide Area (LPWA) is expected to be a communication technology suitable for the Internet of Things (IoT) due to its features, such as low power consumption, low cost, and long-distance transmission. Since LoRa communication has a trade-off between communication range and transmission rate, its communication performance is inherently varied depending on the surrounding environment. Therefore, in the previous study, we proposed a dynamic parameter control method based on beacon reception characteristics to fixed nodes to provide stable and efficient communication and evaluated its effectiveness. However, since the communication environment for mobile nodes is constantly changing, that method is challenging to contribute to performance improvement for mobile nodes. This paper proposes a dynamic transmission parameter control method for mobile terminal with LoRa communication. The effectiveness of the proposed method is evaluated from the real experiments.

DOI： 10.1109/PACRIM61180.2024.10690200

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85206804129&origin=inward

Multipath TCP Video Streaming Hand-Offs on LEO Satellite/5G Cellular Networks 査読有り国際誌

Komatsu Y., Cavendish D., Nobayashi D., Ikenaga T.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Video streaming makes most of Internet traffic nowadays, being transported over Hypertext Transfer Protocol/Transmission Control Protocol (HTTP/TCP). Being the pre-dominant transport protocol, TCP stack performance in transporting video streams has become paramount, specially with regard to MultiPath Transport Control Protocol (MPTCP) innovation and multiple client device interfaces currently available. Recently, Low Orbit Satellite networks have become available as a way to cover remote locations where cellular coverage is spotty at best with Internet access. In this paper, we evaluate video streaming hand-off performance via cellular and LEO links. Such scenario is commonplace in geographical areas where cellular communication is unreliable, such as disaster and conflict torn situations. We provide an extensive analysis of Bottleneck Bandwidth and Round-trip propagation time (BBR) TCP variant, as well as CUBIC when handing off video streams between terrestrial cellular network (5G) and LEO (Starlink) access networks. We use network performance level, as well video quality level metrics to characterize quality of video streaming over TCP variants.

DOI： 10.1109/PACRIM61180.2024.10690202

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85206836877&origin=inward

MEC Collaborative Function Retention System Using WebAssembly for Floating-CPS 査読有り国際誌

Tanaka M., Nobayashi D., Tsukamoto K., Ikenaga T., Sekigawa S., Lee M.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

To promote local production and consumption of Spatio-Temporal Data (STD), we have proposed a Floating Cyber-Physical System (F-CPS) that retains STD and functions (applications) to process and use the STD within a specific area. The F-CPS designed the functions to execute common applications on various types of devices, aiming to accelerate the effective use of STDs. Therefore, the function distributed within the area should be small, and an execution platform for the function does not depend on hardware and operating systems. Furthermore, there is a need for a system to recognize available functions to new users entering the area and deliver them appropriately. In this paper, we propose (1) a compact and portable application execution platform using WebAssembly, and (2) a function Retention System based on the MEC collaborative application delivery method. We evaluate the process of the application execution platform and delivery method in our proposed system using actual equipment. The result of the verification revealed that even when multiple devices retrieve an application simultaneously, the execution of the application could be completed within 2 seconds.

DOI： 10.1109/PACRIM61180.2024.10690196

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85206813965&origin=inward

In-Orbit Performance of LoRa for Internet of Things Communication on MicroOrbiter-1 Satellite 査読有り

Khamsah N.M.N., Moumni F., Nobayashi D., Ikenaga T., Cho M.

COMNETSAT 2024 - IEEE International Conference on Communication, Networks and Satellite 48 - 54 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The integration of Internet of Things (IoT) technology with satellite communications has reformed global connectivity, especially in remote regions that lack terrestrial infrastructure. Recent advancements in optimizing LoRa parameters for satellite-based IoT communications have boosted research in this field. Building on this foundation, the MicroOrbiter-1 satellite developed by MicroOrbiter Inc. in collaboration with the Kyushu Institute of Technology (Kyutech) enhances LoRa-based IoT capabilities in a 1U CubeSat platform. This paper presents the in-orbit performance evaluation of the MicroOrbiter-1 satellite's LoRa-based communication system on the 920 MHz frequency band with three Ground Sensor Terminals (GST) located in Kyutech (Japan), Rancabungur (Indonesia) and Vermont (USA). Key performance metrics such as Received Signal Strength Indicator (RSSI), Spreading Factor, and transmission errors, were analyzed across these locations. The results demonstrated the range of -112 dBm to -127 dBm signal strength for successful communication at low spreading factors. Temporal analysis was conducted using the System Tool Kit to categorize the data received from each terminal. While facing the challenges of power limitation and the lack of an attitude control determination system, the findings in the in-orbit performance analysis of the MicroOrbiter-1 satellite provide valuable insights for optimizing LoRa communication for future satellite missions, especially for CubeSats.

DOI： 10.1109/COMNETSAT63286.2024.10862081

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85218488615&origin=inward

Fairness Improvement of Different TCP Congestion Control Algorithms Using P4 Programmable Data Plane 査読有り国際誌

Ono K., Nobayashi D., Ikenaga T.

2024 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM 2024 2024年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A wide variety of congestion control algorithms have been developed for the transport protocol of TCP/IP. A related study revealed that the communication performance becomes unfair depending on the buffer length of switches or routers in the end-to-end path when communication flows using CUBIC TCP and Bottleneck Bandwidth and Round-trip propagation time (BBR) compete with each other. Therefore, we propose the fairness improvement method between different types of congestion control in the programmable network by using P4 programming. The proposed method provides multiple queues to each congestion control in the switches or the routers for relaying. The proposed method then assigns incoming TCP flows to those queues for each congestion control algorithm. The congestion control algorithm is determined by P4, which implements a programmable data plane. Three types of packet scheduling are used to ensure fairness when sending packets. We evaluate the effectiveness of the proposed method using the network emulator 'mininet' and the communication performance when the queue length of the relaying switch.

DOI： 10.1109/PACRIM61180.2024.10690198

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85206838678&origin=inward

Frequency Bandwidth Limitation Method by Autocorrelation for Ultrasonic Data Collection System 査読有り

Rio Shigyo, Daiki Nobayashi, Kazuya Tsukamoto, Mitsunori Mizumachi, Takeshi Ikenaga

Proc. of IEICE 2023 International Conference on Emerging Technologies for Communications, (ICETC2023) 2023年11月

Complementary Data Diffusion Method for Quick Retention of Large SpatioTemporal Data 査読有り

Renju Akashi, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga and Myung Lee

Proc. of IEICE 2023 International Conference on Emerging Technologies for Communications, (ICETC2023) 2023年11月

Experimental Evaluation of Transmission Control Method Based on Received Signal Strength for Spatio-Temporal Data Retention 査読有り

Renju Akashi, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga and Myung Lee

Proc. of the IEEE 47th Annual International Computer, Software and Applications Conference (COMPSAC 2023) 2023年06月

Improvement of TCP Performance based on Characteristics of Private LoRa Interface 査読有り

Jumpei Sakamoto, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga, Goshi Sato and Kenichi Takizawa

Proc. of the IEEE 47th Annual International Computer, Software and Applications Conference (COMPSAC 2023) 2023年06月

BBR Performance over Variable Delay Paths on Multipath TCP Video Streaming 査読有り

Masayoshi Kondo, Dirceu Cavendish, Daiki Nobayashi, Takeshi Ikenaga

The Fifteenth International Conference on Evolving Internet (INTERNET 2023) 2023年03月

Performance Evaluation on the Impact of Bottleneck Link Buffer Size under Different Congestion Control Algorithm Competition in QUIC 査読有り

Uchida N., Nobayashi D., Ikenaga T., Cavendish D.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 714 - 715 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

QUIC is a secure, general-purpose transport protocol using congestion and retransmission controls on User Datagram Protocol (UDP). QUIC can use the same congestion control algorithms as Transmission Control Protocol (TCP). Thus, when communication between multiple terminals using QUIC competes, the performance of each terminal depends on the congestion control algorithm adopted by the terminal. In related works, the communication performance was evaluated by simulation when both CUBIC and BBR flows competed in TCP, and the results showed that each communication performance became unfair with the buffer size of the shared bottleneck link. In this study, we verify the communication performance at different bottleneck link buffer sizes when BBR and CUBIC compete through actual experiments.

DOI： 10.1109/CCNC51644.2023.10060682

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150629349&origin=inward

Location-Based Autonomous Transmission Control Method for Spatio-Temporal Data Retention System 査読有り

Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Lecture Notes in Networks and Systems 570 LNNS 224 - 235 2023年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

With the development and spread of IoT technology, various devices have been connected to networks. Some data generated from IoT devices depends on geographical location and time (Spatio-Temporal Data). The realization of an architecture for “local production and consumption of STDs” can contribute to location-dependent applications, and therefore we have proposed the STD retention system with vehicles. In our previous study, the vehicle controlled the data transmission probability according to the density of the neighboring vehicles in order to reduce the data transmissions. However, since this method requires all vehicles to transmit beacons, it suffers from the excessive beacon collision when the vehicle density becomes high. In this paper, we propose a data transmission control method that realizes STD retention without transmitting beacons. Our simulation results using Luxembourg model demonstrates that the proposed method can achieve high coverage rate while decreasing the number of data transmissions compared with the existing transmission method based on transmission probability control in real environments.

DOI： 10.1007/978-3-031-20029-8_22

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85141705855&origin=inward

Effective Data-Sharing Method for Multiple ICR Management in Autonomous Distributed Control Systems 査読有り

Kawano T., Nobayashi D., Ikenaga T.

Lecture Notes in Networks and Systems 492 239 - 248 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Industrial carrier robots (ICRs), which are designed to deliver packages to designated destinations automatically in automated and semi-automated facilities, can potentially contribute to resolving labor shortages and improving productivity. Conventional ICRs operate within a centralized system in which a remote server manages both general task assignments and collision avoidance. However, such systems entail significant infrastructure maintenance costs. This paper focuses on autonomous operations and autonomous distributed control methods in which ICRs first share task and location information, and then distribute upcoming tasks among themselves based on that shared information. However, when each ICR is required to communicate with all the other ICRs in a distributed system, the number of wireless communications will increase with the number of system ICRs, thereby wasting wireless communication resources. In this paper, we propose a method that reduces wireless communication loads by using a sink node to streamline communication, and then presents simulation evaluation results that show it can effectively achieve autonomous distributed control in ICR systems.

DOI： 10.1007/978-981-19-3679-1_18

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85142680450&origin=inward

Complementary Data Transmission Control with Collision Avoidance for Efficient Retention of Large-size Spatio-Temporal Data 査読有り

Kaneyasu H., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 710 - 711 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Spatio-temporal aware IoT applications need to deliver the Spatio-Temporal Data (STD), which depends on geographic location and time, to the users in real-time. We have proposed the STD retention system using crowds of vehicles to promote the immediate distribution and utilization of STDs in geographical proximity to the user. However, when the system retains a Large-size STD (LSTD) consisting of multiple packets such as videos and photos, the packet loss due to channel collisions should be suppressed for effective retention of an LSTD. In this paper, we propose a complementary data transmission control method with collision avoidance for LSTD retention and clarify the effectiveness of our proposed method by simulation.

DOI： 10.1109/CCNC51644.2023.10060769

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150663283&origin=inward

A Reliability Audit Mechanism based on Multi-layered Blockchain for Spatio-Temporal Data Retention System 査読有り

Ueda J., Tsukamoto K., Yamamoto H., Nobayashi D., Ikenaga T., Lee M.

Proceedings - IEEE Consumer Communications and Networking Conference, CCNC 2023-January 939 - 940 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

IoT data includes Spatio-temporal data (STD) that is needed only at a specific time and place. In our previous research, we have proposed the STD data retention system (STD-RS), aiming to construct a novel architecture for STD distributing in a retention area by vehicles. However, since vehicles may distribute the STD in unexpected locations due to GPS errors or malicious behavior in a real environment. Therefore, we propose a reliability audit mechanism based on multi-layered blockchain managing and analyzing the history of STD distribution and vehicles' behavior in each retention area. Through simulation experiment, we demonstrated that our mechanism detects the malfunction of STD-RS effectively.

DOI： 10.1109/CCNC51644.2023.10059819

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85150622344&origin=inward

Improvement of TCP Performance based on Characteristics of Private LoRa Interface 査読有り

Sakamoto J., Nobayashi D., Tsukamoto K., Ikenaga T., Sato G., Takizawa K.

Proceedings - International Computer Software and Applications Conference 2023-June 998 - 999 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Low-power wide-area (LPWA) is a major communication technology used in the Internet of Things (IoT). However, since LPWA does not conform to the TCP/IP protocol stack and employs its own unique protocol, sensors equipped with LPWA I/F face difficulty when connecting directly to the Internet. In a previous study, to extend general TCP/IP communication on LPWA networks, we constructed a TCP/IP network over Private LoRa, but it was found that TCP communication performance using LoRa devices was significantly degraded due to the characteristics of LPWA such as the low transmission rate. In the present study, to improve the performance of TCP communication using the Private LoRa interface, we propose a transmission control method that avoids collisions by modifying the advertised window size on IP2LoRa and demonstrate the effectiveness of the proposed method using TCP flow analysis.

DOI： 10.1109/COMPSAC57700.2023.00145

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85168918383&origin=inward

Experimental Evaluation of Transmission Control Method based on Received Signal Strength for Spatio-Temporal Data Retention 査読有り

Akashi R., Nobayashi D., Tsukamoto K., Ikenaga T., Lee M.

Proceedings - International Computer Software and Applications Conference 2023-June 1006 - 1007 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

With the development and spread of IoT technology, the number of devices connected to the Internet is increasing. Some data generated by IoT devices include spatio-temporal data (STD) that depends on the location and time of data generation. Therefore, we have proposed the STD retention system (STD-RS) using vehicles as a network infrastructure for local production and consumption of STD. This paper proposes a transmission control method that can mitigate the fluctuation of RSS due to the influence of obstacles in the real environment and evaluates its effectiveness through experiments on actual devices.

DOI： 10.1109/COMPSAC57700.2023.00149

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85168921651&origin=inward

Poster: Fairness Improvement Method Using ECNs with Different Congestion Control Algorithms within QUIC 査読有り国際誌

Uchida N., Nobayashi D., Cavendish D., Ikenaga T.

Proceedings - International Conference on Network Protocols, ICNP 2023年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

QUIC is a transport protocol that adds congestion control, retransmission control, and TLS to UDP. QUIC can use the same congestion control algorithms as TCP. In previous work, when both CUBIC and BBR flows compete within QUIC, we have shown that communication performance becomes unfair with respect to the buffer size of the shared bottleneck link. In this study, we improve the communication performance at different bottleneck link buffer sizes using Round Trip Time (RTT) and Explicit Congestion Notification (ECN) when CUBIC and BBR compete within QUIC through actual experiments.

DOI： 10.1109/ICNP59255.2023.10355640

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85182512038&origin=inward

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