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IPv6 over LoRaWAN™
(2017)
Although short-range wireless communication explicitly targets local and regional applications, range continues to be a highly important issue. The range directly depends on the so-called link budget, which can be increased by the choice of modulation and coding schemes. The recent transceiver generation in particular comes with extensive and flexible support for software-defined radio (SDR). The SX127× family from Semtech Corp. is a member of this device class and promises significant benefits for range, robust performance, and battery lifetime compared to competing technologies. This contribution gives a short overview of the technologies to support Long Range (LoRa™) and the corresponding Layer 2 protocol (LoRaWAN™). It particularly describes the possibility to combine the Internet Protocol, i.e. IPv6, into LoRaWAN™, so that it can be directly integrated into a full-fledged Internet of Things (IoT). The proposed solution, which we name 6LoRaWAN, has been implemented and tested; results of the experiments are also shown in this paper.
Tests of distributed wireless networks pose various challenges with regard to node, link, path, and management problems.
In this contribution a novel testbed architecture is presented, which helps in the development of distributed wireless networks. In the case of our project, it helped with the development of a routing protocol for energy autarkic network nodes. The testbed contains various elements: The major part is an embedded web server using web and AJAX technology. Thus, the management servers resources can be kept extremely lean, and a large number of those nodes can potentially be dislocated throughout the network. The server includes an extremely streamlined JavaScript-library for use on very lean microcontrollers. Further elements include a wave-guided bread-board RF installation, fully controlled by software in order to automatically run as many test-cases as possible and automatic test routines in the wireless nodes to significantly reduce the effort of regression tests.
Routing is a key feature for wireless sensor networks, as it extends the geographic range, enables larger installation and provides redundancy to packet transmission. A extensive variety of routing protocols has been designed for wireless sensor networks; however, until today, integration of unidirectional nodes poses a challenge. This paper proposes a routing algorithm to integrate unidirectional and even energy-autarkic nodes into an ad-hoc routing mechanism. It gives an insight into protocol development and various extensions, which proof the practical usability of the chosen approach as well for static and as for dynamic sensor nodes. The protocol was implemented and tested on EnOcean wireless nodes. It enables reasonable performance while causing very small overhead with regard to memory footprint and processing power.
The work presents a low cost MEMS sensor based input device for Virtual Reality systems. A customized add-on with MEMS gyroscopes and magnetic field sensors was created for the Nintendo(TM) Wii Remote Controller to produce a oneto- one mapping in orientation estimation. Advanced nonlinear Kalman filtering methods were used for the fusion of the signals from low performance inertial and magnetic sensors. The estimated orientation is employed for correction of relative position estimation based on markers from the IR camera image. The estimated 6DOF are sent via Bluetooth in real-time to COVISE visualization system running on the host computer.