Testbed

About: Testbed is a research topic. Over the lifetime, 10858 publications have been published within this topic receiving 147147 citations. The topic is also known as: test bed.

How was your journey?: uncovering routing dynamics in deployed sensor networks with multi-hop network tomography

Abstract: In the context of wireless data collection, a common application class in wireless sensor networks, this paper presents a novel, non-intrusive algorithm for the precise reconstruction of the packet path, the per-hop arrival order and the per-hop arrival times of individual packets from partial in-band information at runtime Information is reconstructed outside the network immediately after a packet is received at the sink After establishing the correctness of our proposed algorithm, we evaluate its performance in testbed experiments using CTP and Dozer, two well-known data collection protocols Foremost interested in obtaining a better understanding of the performance of long-term real-world deployments, Multi-hop Network Tomography (MNT) is applied to in total more than 140 million packets that have been obtained from three multi-year WSN deployments of the PermaSense project The capabilities of the performance analysis of deployed systems using the proposed algorithm and methodology are demonstrated in a case study

The SPHERES Guest Scientist Program: collaborative science on the ISS

Abstract: The SPHERES Guest Scientist Program (GSP) supports the efforts of geographically distributed researchers at MIT, the U.S. Department of Defense, NASA, and elsewhere, in the development of algorithms for the SPHERES formation-flying and docking testbed. The GSP consists of a test development framework, a robust and flexible interface to the SPHERES flight software, a portable high-fidelity simulation, two laboratory testbeds, and data analysis utilities. The SPHERES testbed will be operated in bi-weekly test sessions on-board the International Space Station. Updates to the flight software can be uploaded immediately prior to each test session, allowing guest scientists the opportunity to revise and improve their algorithms from one session to the next. The SPHERES flight software architecture and the GSP interface design contribute to the flexibility of the testbed, and minimize nonproductive labor by simplifying algorithm implementation.

A 320-Gb/s Capacity (32-User $\times$ 10 Gb/s) SPECTS O-CDMA Network Testbed With Enhanced Spectral Efficiency Through Forward Error Correction

Abstract: This paper demonstrates a high-performance optical-code-division-multiple-access (O-CDMA) network testbed using the spectral phase encoded time spreading (SPECTS) method. Through additional time and polarization multiplexing, a total of 32 10-Gb/s users are supported while sharing eight O-CDMA spreading codes. User detection is achieved with time gating and nonlinear thresholding to suppress the multiaccess interference of other users. Incorporation of forward error correction successfully reduces the performance loss imposed by coherent beat interference, resulting in error-free performance (BER<10-11), significant per-user power penalty reduction, and the elimination of a bit-error-rate noise floor. The testbed also applies bandwidth suppression within the encoders and decoders, yielding a 52% increase in spectral efficiency

Mobile IPv6 in Internet of Things: Analysis, experimentations and optimizations

Abstract: The IPv6 over Low-Power Wireless Personal Area Networks (6LoWPAN) standard allows heavily constrained devices to connect to IPv6 networks. This is an important step towards the Internet of Things, in which most of the physical objects will be connected to the Internet. Among them, a large number is likely to be mobile and therefore requires a mobility management protocol to maintain IP connectivity. Layer 3 mobility is commonly managed by Mobile IPv6 but this protocol is categorized as too complex for constrained devices in the literature. Such conclusions are based on simulations or experimentations in which several aspects of the protocol remain insufficiently detailed nor evaluated. In this article, we propose a complete evaluation of Mobile IPv6 over 6LoWPAN. For this, we have implemented Mobile IPv6 in the Contiki operating system and have performed intensive experimentations on a real testbed. We also propose a new mechanism for movement detection, as the standard procedure cannot be applied as is. This new mechanism, referred to as Mobinet, is based on passive overhearings. The results highlight that Mobile IPv6 can be a practical solution to manage layer 3 mobility on 6LoWPAN.

Head-to-TOE Evaluation of High-Performance Sockets over Protocol Offload Engines

Abstract: Despite the performance drawbacks of Ethernet, it still possesses a sizable footprint in cluster computing because of its low cost and backward compatibility to existing Ethernet infrastructure. In this paper, we demonstrate that these performance drawbacks can be reduced (and in some cases, arguably eliminated) by coupling TCP offload engines (TOEs) with 10-Gigabit Ethernet (10GigE). Although there exists significant research on individual network technologies such as 10GigE, InfiniBand (IBA), and Myrinet; to the best of our knowledge, there has been no work that compares the capabilities and limitations of these technologies with the recently introduced 10GigE TOEs in a homogeneous experimental testbed. Therefore, we present performance evaluations across 10GigE, IBA, and Myrinet (with identical cluster-compute nodes) in order to enable a coherent comparison with respect to the sockets interface. Specifically, we evaluate the network technologies at two levels: (i) a detailed micro-benchmark evaluation and (ii) an application-level evaluation with sample applications from different domains, including a bio-medical image visualization tool known as the Virtual Microscope, an iso-surface oil reservoir simulator, a cluster file-system known as the parallel virtual file-system (PVFS), and a popular cluster management tool known as Ganglia. In addition to 10GigE's advantage with respect to compatibility to wide-area network infrastructures, e.g., in support of grids, our results show that 10GigE also delivers performance that is comparable to traditional high-speed network technologies such as IBA and Myrinet in a system-area network environment to support clusters and that 10GigE is particularly well-suited for sockets-based applications