Jian-Jin Li

Application of Modified RPL Under VANET-WSN Communication Architecture

This paper focuses on the routing protocol for driving safety that vehicle collects state message from roadside sensors in VANET-WSN. Routing Protocol for Low Power and Lossy Networks (RPL), a tree-based routing protocol, adapts naturally to our routing requirement. But RPL is designed for static wireless sensor network, so we need to modify RPL to fit in with high dynamic topology of VANET-WSN. For the first time, we utilize Geographical Information (GI) as the metric for RPL (GI-RPL), which lets RPL in a timely fashion. We also propose some strategies for tuning RPL in VANET-WSN. To demonstrate the performance of GI-RPL, we set up a simulation by using Cooja and compare with another modified RPL. The result of simulation shows that GI-RPL has high Package Delivery Ratio (PDR), reasonable overhead and low delay.

A New Approach for Wireless Sensor Network Management: LiveNCM

The Wireless Sensor Networks (WSN), with their constant evolution, need more and more practical and effective WSN Management Tools (WMT) for large-scale deployment. Due to the resource constraints of wireless sensor node, it is impossible to implement the full classical SNMP standard in WSN applications. Therefore, it is important to develop new WMT providing a subset of functionalities of SNMP standard dedicated to WSN by taking into account the resource constraints of wireless sensor node. In this paper, we propose a new WMT named LiveNCM: LiveNode Non-invasive Context-aware, and modular Management. LiveNCM is based on a configurable modular architecture enables to fit to an application and to provide traditional administration functionalities similar to the SNMP ones. In addition, LiveNCM introduces the concept of noninvasive context-aware to diagnose the wireless sensor node state to reduce the network traffic then the energy consumption. This reduction is obtained by estimating some data with linear models like polygonal ones or interpreting data message exchanges. To validate the proposed concept, the LiveNode platform is used to implement and test energy consumption with LiveNCM protocol.

Cooperative Inter-Vehicle Communication Protocol Dedicated to Intelligent Transport Systems

MANET marks the new age of the modern communication and it is a key technology to solve many applications such as telemedicine, environment monitoring, intelligent transport system (inter-vehicle communication) etc. In this paper a new MANET protocol dedicated to intelligent transport system: CIVIC (communication inter vehicule intelligente et cooperative) is described. CIVIC is a context aware routing protocol taking into account the location of each mobile node, road traffic, geographic environment (road map) etc. Moreover, CIVIC is implemented to support infrastructure and ad-hoc network, hybrid MANET protocol, and multi- support wireless access mediums. In this paper, we introduce the different worldwide leading research projects dedicated to inter- vehicle communication, the key features of CIVIC, the implementation of CIVIC on LiveNode sensor and the application project MobiPlus.

Cooperative Inter-vehicle Communication Protocol With Low Cost Differential GPS

This paper describes a cooperative MANET protocol dedicated to intelligent transport systems, named CIVIC (Communication Inter Vehicule Intelligente et Cooperative). The CIVIC protocol is an auto-configuration inter-vehicle communication protocol, which supports adhoc and infrastructure networks, contains reactive and proactive routing components, and adapts different wireless standards. It is a context-aware protocol reacting to vehicle status, road traffic, and geographic environment. It supports location-based communication. To improve the accuracy of GPS, it integrates a localization solution called LCD-GPS (Low Cost Differential GPS). It has been implemented and experimented on the LiveNode sensor developed by our lab. At the end of this paper, an application project MobiPlus is introduced.

TrAD: Traffic Adaptive Data Dissemination Protocol for Both Urban and Highway VANETs

Vehicular Ad hoc Networks (VANETs) aim to improve transportation activities that include traffic safety, transport efficiency and even infotainment on the wheels, in which a great number of traffic event-driven messages are needed to disseminate in a region of interest timely. However, due to the nature of VANETs, highly dynamic mobility and frequent disconnection, data dissemination faces great challenges. Inter-Vehicle Communication (IVC) protocols are the key technology to mitigate this issue. Therefore, we propose an infrastructure-less Traffic Adaptive data Dissemination (TrAD) protocol that considers road traffic and network traffic status for both highway and urban scenarios. TrAD is flexible to fit the irregular road topology and owns double broadcast suppression techniques. Three state-of-the-art IVC protocols have been compared with TrAD by means of realistic simulations. The performance of all protocols is quantitatively evaluated with different real city maps and traffic routes. Finally, TrAD gets an outstanding overall performance in terms of several metrics, even though under the worse condition of GPS drift.

LiveNCM : A new wireless management tool

The Wireless Sensor Networks (WSN) with their constant evolution, need new management methods to be monitored efficiently by taking into account their constraints such as energy consumption, reliability and remote monitoring. Note that WSN has diverse application domains: smart home, smart care, environmental data collection etc. In order to manage a large scale WSN, some Wireless sensor network Management Tools (WMTs) are developed. Some of them use SNMP protocol but it is impossible to implement the full classical SNMP standard on each node. Therefore, it is important to develop a new WMT with a restricted SNMP standard dedicated to WSN applications. In this paper, we present a new WMT named LiveNCM: LiveNode Non invasive Context-aware, and modular Management tool. LiveNCM is divided into two main parts: one is centralized on the fixed network structure and another one, distributed on each node. Each part introduces the concept of non-invasive contextaware to reduce data exchanges and diagnoses the wireless sensor node state with few messages. Moreover, nodes are based on a configurable modular architecture enables to adapt to an application and to local node constraints. LiveNCM is implemented on the LiveNode platform to validate the energy consumption and on a UNIX system to validate the SNMP sub-agent used. Ultimately, a decreasing data exchange and an improvement in the energy consumption in the entire WSN were observed.

Fuzzy position based routing in clustered wireless sensor network for smart environment

Clustering is a good method to increase WSN lifetime and particularly for smart environment. In this paper, we present fuzzy position based routing for clustered sensor network. It is very useful for the smart environment applications of wireless sensor network without GPS support. The destinations could be located with ambiguous position vectors, and the long time and energy consumption of requesting/replying for node ID in traditional routing of sensor-actor network is avoided. The results of simulation using SHAWN show that in the fuzzy position based routing, if the destination range is more precise, the average delay and energy consumption are more reduced.

An embedded system dedicated to intervehicle communication applications

To overcome system latency and network delay is essential for intervehicle communication (IVC) applications such as hazard alarming and cooperative driving. This paper proposes a low-cost embedded software system dedicated to such applications. It consists of two basic component layers: an operating system, named HEROS (hybrid event-driven and real-time multitasking operating system), and a communication protocol, named CIVIC (Communication Inter Véhicule Intelligente et Coopérative). HEROS is originally designed for wireless sensor networks (WSNs). It contains a component-based resource-aware kernel and a low-latency tuple-based communication system. Moreover, it provides a configurable event-driven and/or real-time multitasking mechanism for various embedded applications. The CIVIC is an autoconfiguration cooperative IVC protocol. It merges proactive and reactive approaches to speed up and optimize location-based routing discovery with high-mobility nodes. Currently, this embedded system has been implemented and tested. The experiment results show that the new embedded system has low system latency and network delay under the principle of small resource consumption.

Overview of Smart White Canes: Connected Smart Cane from Front End to Back End

There are 285 million visually impaired people (VIP) worldwide, among whom 39 million are blind (WHO 2014).