label: url

en: On-Body and Off-Body Communications: A Comparative Study Between Hardware and Simulations

en: The IEEE 802.15.6 standard defines wireless body area networks (WBANs) for communication in, on, and around the human body. However, commercially available hardware platforms that support direct experimental validation of IEEE 802.15.6-oriented WBAN studies remain limited. As a result, much WBAN research still relies on simulations or custom-built transceivers, leaving the practical validity of simulation results uncertain. In this study, we evaluated a configurable radio platform for GMSK-based narrowband WBAN PHY validation in the 420-450 MHz band by comparing theoretical calculations, ns-3 simulation results, and hardware measurements. Evaluations covered both on-body and off-body scenarios at transmit powers from -15 to -25 dBm. Our key findings are as follows: (1) lower transmit power consistently decreases the communication range in both simulated and hardware environments; (2) degradation trends in packet success rate are similar for both environments, supporting simulation credibility; and (3) in the off-body scenario, ns-3 simulations overestimate the communication range by approximately 10 m compared to hardware under identical conditions. The publicly available simulation framework facilitates reproducible WBAN research. Our results confirm that our ns-3 implementation can be used effectively to approximate key GMSK-based WBAN PHY behaviors in realistic conditions while identifying specific differences in range estimates.

en: Sensors

ja: Sensors


en: Perspectives on IoT-oriented network simulation systems

en: The Internet of Things (IoT) paradigm is assumed to be a major component in the present and future Internet, with forecasts claiming a humongous number of devices connected in the near future, and applications fields spanning from agriculture, to healthcare. Despite this, the standardization efforts have not yet resulted in widely adopted standards, and the market is fragmented into multiple solutions both at physical andcommunication protocol levels. Moreover, IoT systems exacerbate the usual test bed limitations, e.g., scalability(very large number of devices), hardware compatibility, space, and price. Due to the above problems, simulation tools become an extremely interesting tool for studying IoT systems both for academia (newalgorithms), standardization (new protocols), and industry (what-if analysis). In this paper we will discuss what are the most relevant features and models that a simulation tool like ns-3 should prioritize to enable the above-mentioned needs from academia, standardization, and industry, and if they are achievable in the short,medium, or long term.

en: Computer Networks

ja: Computer Networks


en: Broadcasting Using Adaptive Network Coding Based on Node Mobility in Mobile Ad-hoc Networks

ja: アドホックネットワークにおけるノード移動性推定に基づく適応型ネットワークコーディングを用いたブロードキャスト

en: The Transactions of the Institute of Electronics, Information and Communication Engineers B

ja: 電子情報通信学会論文誌(B)


en: Performance Analysis of IEEE 802.15.4 Bootstrap Process

en: Electronics

ja: Electronics


en: Adaptive Network Coding based on Node Mobility for Broadcasting in Mobile Ad-hoc Networks

en: Mobile ad-hoc networks (MANETs) have limited network resources such as node battery capacity and wireless frequency bands. Therefore, to ensure efficient broadcast communication in such networks, it is critical to reduce unnecessary packet transfers and maximize the use of network resources and power. Network coding (NC) is a technique for reducing the number of transmitted packets over a network and maximizing the use of devices and network resources. The packet-reduction benefits obtained using NC depend considerably on network topology. In this study, we propose an NC method particularly designed for MANETs. In our approach, the nodes switch the type of transmission between an uncoded transmission (simple broadcast) and a coded transmission (NC) based on the estimated neighboring node's proximity. The effectiveness of the proposed method was evaluated using computer simulations. Our evaluations demonstrated that the proposed method can reduce the number of packets in the network without decreasing the packet delivery rate.

en: International Journal of Networking and Computing


en: Collaborative Defense Techniques Against MANETs Malicious Nodes

en: Blackhole (BH) attacks are among the most significant threats in mobile ad-hoc networks. A BH is a security attack in which a malicious node absorbs data packets and sends fake routing information to neighboring nodes. BH attacks have been widely studied. However, existing defense methods wrongfully assume that BH attacks cannot overcome the most common defense approaches. A new wave of BH attacks is known as smart BH attacks. In this study, we used a highly aggressive type of BH attack that can predict sequence numbers to overcome traditional detection methods that set a threshold to sequence numbers. To protect the network from this type of BH attack, we propose a collaborative defense method that uses local information collected from neighboring nodes. We evaluated the performance of our defense method against a smart BH attack and a collaborative attack that uses the collaboration of another malicious node. Our results show that the proposed method successfully detects and contains these threats to some degree. Consequently, the smart BH attack success rate decreases.

ja: International Journal of Networking and Computing


en: IEEE 802.15.4 Now and Then: Evolution of the LR-WPAN Standard

en: International Conference on Advanced Communication Technology, ICACT


en: Zone-based Energy Aware Data Collection Protocol for WSNs

en: IEICE Transactions on Communications

ja: IEICE Transactions on Communications


en: Practical node design for wireless multi-hop network applications in oyster farming

en: IEICE Communications Express (COMEX)

ja: IEICE Communications Express (COMEX)