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Data Center is a multifunctional infrastructure that consists of thousands of compute servers and network devices. The fat-tree topology is widely adopted because of its efficiency and safety. However, the fat-tree topology can not completely meet the time-varying communication needs from physical and virtual machines. 60 GHz wireless technology was then incorporated into data centers for its high...
In this paper, we introduce an estimation of communication range using Wi-Fi for V2X communication environment. Traffic accidents and traffic hazard are serious social problems. Understanding road condition in advance is important and necessary to prevent traffic accidents and traffic hazards. In addition, getting information without Internet connection is necessary to provide road information for...
The wireless signal needs to constantly test to discover and correct signal problem since its planning and construction. Currently, most of the existing wireless signal testing equipment are testing on the road, and there are many shortcomings. The real-time wireless signal testing and analyzing system based on websocket has realized the mobile, networked and real-time road test for the wireless signal,...
To accommodate rapidly growing data traffic, the moving small-cell (mSC) access point (AP) equipped for contents caching storage has been considered for mobile communication network. In mSC network, the contents can be directly transmitted from mSC without use of mobile networks. Therefore, mSC networks can alleviate loads of macro-cell base station (MBS) and can improve overall networks throughput...
By introducing Caching as a Service (CaaS) in Cloud radio access network (C-RAN), the joint resource segmentation and transmission rate adaptation problem is investigated in this paper. Specifically, in the baseband unit (BBU) pool of C-RAN, we optimally segment computation and storage resources to different types of virtual machines (VMs), and in the remote radio heads (RRHs), we adjust the beamformers...
IEEE 802.11-based wireless LAN, commonly referred to as Wi-Fi, has become a universal solution for the last-hop network access. In large and public assembly places, people may use their mobile devices to view the video of the same popular events via the same wireless access points (APs). However, current 802.11 APs transmit the same video stream multiple times via separate unicast sessions due to...
Buildings will be more and more automated in future to cater for user's comfort, security and energy efficiency needs. Most of the building automation devices are expected to be in operation for a number of years. However in future, markets will be shared by a number of communication standard, which implies that the user may want to upgrade their device to another communication standard easily without...
The solar street lamp system using GPRS and ZIGBEE technology is designed in this paper. The street lamp management system is composed of GPRS wireless mobile network and ZIGBEE short-distance wireless network. Users can view the real-time parameters of street lamps on the computer (or mobile phone), and at the same time, can also set up some working parameters (e.g., working mode, voltage of turning...
Indoor positioning technology based on WLAN signal strength is one of the most practical technical solutions. Considering the factors of environmental adaptability, laying cost and system complexity, the signal fingerprint positioning has become the first choice of the real time positioning technology. Because of the requirement of real-time positioning, the number of samples collected in the online...
The connection-oriented nature of wireless access has been setting limitations to accessing Internet services. In particular, Internet access via public Wi-Fi infrastructure typically requires a subscription and a complicated authentication procedure that can hinder connection establishment, according to recent reports. In this respect, we present FreeSurf, an architecture for turning existing wireless...
In this paper, we discuss the implementation of LoRa network server on OpenStack. LoRa is a type of low power wide area wireless network protocols for Internet of Thing applications. We restructured the operations of LoRa network server so it can be flexible and scalable by exploiting the system services provided by OpenStack. For validation, we have established an experimental system by using available...
Recent years people have witnessed a surge of interest in APT attack, due to its complex and persistent attack characteristics. In order to prevent APT attacks, this article studies and analyzes a large number of APT attack cases which have been disclosed, gives an overview of APT attack lifecycle and attack techniques. This paper discusses the purposes of APT attacks and APT attack characteristics...
The need to improve road traffic management is evident worldwide. Growing congestions on the roads along with a gradual increase of pollution and concern for improving traffic safety have prompted to explore the potential of the Intelligent Transportation Systems through numerous research projects funded by public entities and/or the automotive industry. However, due to various reasons, including...
Human Machine Interface (HMI), referred to as a correlated system of human activities and operation of a specific device, ratifies control mechanism of a targeted machine by execution of certain physical actions. This paper presents an effective design of an Android-based Human Computer Interactive (HCI) system with voice command activation and gesture recognition to control a computer. With a continuous...
Now-a-days, the release of hazardous gases is one of the major threat not only for the environment but also for climate and lives. Both global and local extensive ecological damage is responsible for this case. There are a number of sources for gas emission, like; exhaust gases from industry as well as traffic, fires flue gases, waste disposals, various incidents at the chemicals geo-dynamically active...
This work examines the user-pair selection problem for distributed-input distributed-output (DIDO) wireless systems. A DIDO system refers to a network of densely deployed transmitter and receiver pairs, where the transmitters are connected to and coordinated by a DIDO server. The system sum rate is known to grow without bound as the number of transmitter-receiver pairs increases. However, when zero-forcing...
Wireless caching has been used to improve network performance and reduce bandwidth and energy consumption. In this paper, we study the issue of joint admission control and content caching for wireless access points with energy harvesting capability. Given limited energy supply, the access points, in a competitive environment, aim to maximize their payoff defined in terms of revenue by optimizing their...
Now-a-days wireless technologies are being used more and more. The advancement in wireless technologies offers a good opportunity in lots of areas and one of them we find is printer or printing services. This paper proposes a design of an embedded system which directly prints the data through handheld devices from only traditional local printer in spite of using proprietary wireless printers. With...
Li-Fi is an upcoming technology which transmits information through light at a very high speed when compared to present technology. Visible Light Communication(VLC) using LED is a promising technology for next generation in short range high speed data communication. In present shopping system there are many difficulties. We propose a working model for shopping with automatic product detection and...
Advances in wireless communication devices and systems have a significant impact on various fields like agriculture, healthcare, smart homes etc. One of its important applications is the development of monitoring system for various purposes. Automated water usage monitoring system proposes an effective way of controlling the wastage of water at home/Industries by means of Wireless sensor nodes and...
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