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In this paper, we propose a cloud-assisted network coded packet retransmission approach to reduce the number of packet retransmission in wireless multicasting. It is shown that the efficiency of packet retransmission can be significantly improved if we include network topology information (e.g., Network connectivity) during the encoding process of network coding. We leverages the capability of software-defined...
This paper presents the development of wireless light switch system with primary signal carrier band in Sub- GHz. In contrast to conventional wired lighting system, wireless concept delivers much more efficient application in material budget, distance, simplicity and performance. At the other side, application may be better performed with Wi-Fi network of 2.4GHz in terms of worldwide popularity, however,...
In this paper, we propose a 3G to Wi-Fi offloading Android-based application. Due to growing demand for a high-speed mobile data connection around the clock, 3G networks begin to face high congestion levels rendering the mobile service providers unable to meet customer expectations. Despite the existence of various solutions, offloading to Wi-Fi proves to be an optimal one as it takes advantage of...
Scalability of Ethernet is a known issue where communication is disturbed by broadcast traffic caused by a large number of nodes in a single broadcast domain. This paper proposes Extensible Transparent Filter (ETF) for Ethernet using SDN, that suppresses broadcast traffic in a broadcast domain by selecting an appropriate outgoing port of the switch through which the target host of broadcast packet...
This paper introduces a cross-layer implementation, named WiPoMu, that aims to improve efficiency and resilience of the traditional WiFi model. WiPoMu is developed based on three key technologies: Wireless virtualization, Policy routing, and Multipath TCP (MPTCP). Specifically, WiPoMu adopts the wireless virtualization to create multiple virtual WiFi interfaces on a single physical one, hence WiPoMu...
This paper explores direct phone-to-phone communication (via WiFi interface) among vehicles to support mobile sensing applications. Direct communication among drivers' phones is important in improving data collection efficiency and sharing participatory sensing information in an inexpensive manner. We design a practical and optimized communication mechanism for direct phone-to-phone data transfer...
Reliable indoor positioning is an important foundation for emerging indoor location based services. Most existing indoor positioning proposals rely on a single wireless technology, e.g., Wi-Fi, Bluetooth, or RFID. A hybrid positioning system combines such technologies and achieves better positioning accuracy by exploiting the different capabilities of the different technologies. In a hybrid system...
In this demonstration, we show our ongoing work called MOVi+ that extends MOVi (Mobile Opportunistic Video-on-demand) for improving the scalability in terms of number of mobile clients. By exploiting sustainable segment-based caching-enabled switch, MOVi+ increases the opportunity of peer-to-peer connectivity, which can eventually service more number of mobile clients than original MOVi with shorter...
We propose a device discovery approach and connection establishment scheme for opportunistic networks using Ad-Hoc Wi-Fi as the underlying communication technology. We employ beacon stuffing method for a device to announce its existence in its neighborhood by broadcasting beacons stuffed with useful information in the field of SSID to remote devices. This method can allow a device to discover multiple...
In this paper, we consider the problem of modelling the average delay experienced by an application packets of variable length in a single cell IEEE 802.11 DCF wireless local area network. The packet arrival process at each node i is assumed to be a stationary and independent increment random process with mean ai and second moment ai(2). The packet lengths at node i are assumed to be i.i.d random...
Ubiquitous computing for context aware system collects information from many static and moving devices as well as sensor integrated objects. To provide valuable services, it is necessary to track the location of the users or objects. There are many possible applications that can apply location-assisted service such as child tracking, supermarket trolley alert system, firefighter tracking and many...
Wi-Fi fingerprinting is a technique which can provide location in GPS-denied environments, relying exclusively on Wi-Fi signals. It first requires the construction of a database of “fingerprints”, i.e. signal strengths from different access points (APs) at different reference points in the desired coverage area. The location of the device is then obtained by measuring the signal strengths at its location,...
Current passive RFID systems face the challenges to locate mobile objects in real time in indoor environments, including the realization of low delay as well as effective cooperation among readers and accurate ranging ability in the physical layer. In order to overcome these challenges, this paper presents a low delay multi-reader passive RFID system using ultra high frequency (UHF) radio as the forward...
The importance of wireless communications has been growing. Wi-Fi and FSO are very important technologies in this context. Performance is a very relevant issue, leading to more reliable and efficient communications. Laboratory measurements are made about several performance aspects of Wi-Fi (IEEE 802.11 a, g) point-to-point links, namely at OSI levels 4 and 7. An FSO medium range link has been successfully...
Seamless handoff issues including authentications have become considerable interest in wireless networks, which support pervasive environment users. Usually the active scanning and preauthentication methods are adopted to solve the disruption in seamless services. In this paper, we propose a new preauthentication scheme based on the fast channel switching and the power saving mode (PSM) in public...
In the IEEE 802.11 WLAN, a mobile station (MS) performs a handover whenever it moves out of range of one access point (AP). However, channel scanning which discovers the new available APs is the dominating factor in handover latency, accounting more than 90% of overall latency. In order to reduce such a scanning latency, we focus on the method reducing the number of channels for the MS in handover...
Location-aware is becoming an important aspect of mobile computing. A core problem in location-aware service is the determination of physical location. For applications in open, outdoor areas, the Global Positioning System is a common choice. Although GPS offers near-worldwide coverage, its performance degrades indoors and in high-rise urban areas. By using signal strength, it is possible to locate...
Because wireless stations independently select which access points to camp on, the total wireless station traffic on all available IEEE 802.11 network APs might be unevenly distributed. This load-balancing problem can lead to overloading and network congestion. This survey examines the problem, along with state-of-the-art network- and wireless-station-based solutions. It also presents experimental...
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