Ngoc-Thanh Dinh

RESTful Architecture of Wireless Sensor Network for Building Management System

The concept of an “intelligent building” received significant attention from academic, industry and standard development organizations when technically termed a building management system (BMS). Wireless sensor networks (WSNs) and their recent development enhanced monitoring and control applications for the building’s areas. This paper surveys and analyzes advantages of the main current and emerging approaches that may be fit for BMS. Specifically, we discuss challenges including interoperability, integration, overhead, and bandwidth limitation of WSNs in BMS. Based on analyses, we highlight the advantages of an IP-based and RESTful architecture approach as the most suitable solution for BMS using WSNs (BMS-WSN). The paper also describes our future direction and design for BMS-WSN based on these advantages. The purpose is to enable interaction of users with BMS-WSN in the same way as with any website while ensuring energy efficiency. A test-bed implementation and evaluation of a BMS application is also introduced in this paper to demonstrate the feasibility and benefits of IP-based and RESTful architecture for BMS.

Content sharing using P2PSIP protocol in Wi-Fi direct networks

Efficient sharing of content among users in a close area is a challenging problem remaining in smart devices. This paper presents an architecture which allows users in a group to experience the ubiquitous and real -time sharing service of resource like image, video and website address. Our approach is motivated by taking advantage of the novel industrial standard Wi-Fi Direct which allows Wi-Fi terminals to establish a Wi-Fi network without a real Access Point (AP) and P2PSIP protocol which enables real-time communication using Session Initiation Protocol (SIP) in a Peer-to-Peer (P2P) fashion. Accordingly, with instant ad-hoc peer-to-peer connectivity, content sharing among users is conducted more easily and quickly. We describe a prototype application and discuss major practical requirements of the proposed system.

Information-centric dissemination protocol for safety information in vehicular ad-hoc networks

In vehicular networks, efficient safety information dissemination is a crucial issue. Unique characteristics of such an environment like highly mobility, fast topology changing, short-lived and intermittent connectivity pose challenges for safety information dissemination. Although IEEE 802.11p is standardized as an amendment to the IEEE 802.11 for connection-based wireless communication in vehicular environments (WAVE), it is still an open topic and a challenge to efficiently handle high mobility, intermittent connectivity, and spontaneous characteristics of vehicles on the roadway during wireless communication. This paper exploits information centric networking approach to design an efficient information dissemination protocol for such a challenging environment. The protocol is designed for both communication schemes in vehicular networks including vehicles-to-vehicles and vehicle-to-road. By focusing on information object itself, instead of end-to-end connection, the proposed mechanism supports fast and efficient data dissemination among multiple content consumers and multiple content providers, removing dependence on end-to-end connection between two nodes, thus improve the overall network performance. Through experimental results over different scenarios, we show that the proposed protocol achieves a significant improvement in term of the network performance compared to the conventional approach (WAVE).

Directional anycast routing in wireless sensor and actor networks

Current routing approaches in wireless sensor and actor networks (WSANs) display lack of unification for different traffic patterns because they are designed separately for sensor-actor and actor-actor communications. In this paper, we explore the capabilities and compounding advantages of directional antennas and actors and propose a unified routing protocol supporting arbitrary traffic in WSANs. The proposed routing protocol uses actors as the main routing anchors as much as possible because they have enough energy and computing power and use directional anycast routing to reduce the total energy consumption of the overall network. The performance of this routing protocol is compared with conventional ones by simulation.