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Distributed storage systems provide reliable data storage by keeping redundancy over a large number of storage nodes in the network. Due to the large number of storage nodes, they can not be regarded as always available. Compared with replications, erasure codes can achieve higher data integrity, such that any k among n storage nodes can recover the original data. Moreover, in order to maintain a...
Live streaming of high quality media requires high quality network in terms of packet loss rate and jitter. However, the current IP or Ethernet network does not assure the bandwidth or jitter for streaming in general. In addition, the existing network monitoring system does not have the functionality to measure these network quality. My precise network monitoring is a packet-by-packet network monitoring...
Surveillance and reconnaissance applications in wireless sensor networks (WSNs) are primarily intended to detect, identify and track adjacent hostile targets in military environments. These applications require the high reliability in acquiring the precise information on the enemy and they pursue energy-efficiency to ensure the longevity of their mission. Until now, although a lot of routing protocols...
In wireless sensor networks, reducing the energy consumption of the whole network is one of the most important research themes. In this paper, we first define a data aggregation model that defines the relationship between the increased amount of entropy and the number of sensor nodes. We also develop an intermittent transmission method, which is mainly assumed clustered sensor networks. Each sensor...
IEEE 802.15.4 (low-rate Wireless Personal Area Networks-WPANs) [1] and IEEE 802.15.7 (Visible Light WPANs) [2] are one of the typical of WPANs which can support QoS through guaranteed time slots (GTS) mechanism to allocated a specific duration within a superframe structure for a TDM transmission. The low bandwidth utilization problem may occur in GTSs when the allocated bandwidth is less than the...
In this paper, we investigate how femtocells can make conventional cellular networks greener. We present an energy consumption modeling framework to evaluate total energy consumption in a cellular network with femtocells. Using the proposed framework, we investigate the energy consumption and performance of the cellular network with femtocells. We consider various network environments, including indoor...
A daptive radio resource allocation in a cellular and multiuser OFDMA-Based relay network is considered in this paper. We solve the problem with the objective function for minimizing total transmitted power and the constraints on the relay and user data rates. We have studied adaptive subframe and subcarrier allocation and greedy bit loading in a cellular scenario. Users are distributed randomly and...
In this paper, we analyze a spectrum shared cognitive radio based on a power control and a time sharing for avoiding the inter-system interference between a primary system and a secondary system on the same frequency. In general, only the secondary system avoids giving interference toward the primary system by controlling the communication parameters like transmit power, frequency, transmit timing...
Video multicast service is becoming one of the most important applications over WiFi, due to the increasing popularity of WiFi for multimedia communication. On the one hand, energy efficient operation is required to WiFi technology due to the limited battery power of most WiFi-equipped devices. In this paper, we empirically study the video multicast operation, especially, along with power management...
Cognitive Radio has been proposed as a promising technology to solve today's spectrum scarcity problem. Most part of frequency spectrum is already allocated for existing wireless systems. Cognitive radio technology has aroused people's interest in utilizing unused spectrum of the legacy systems. Due to the stochastic behavior or the available channels in cognitive radio networks, it has been a matter...
To enhance the handover performance of Mobile IP in heterogeneous wireless networks, we investigate the effects of L2 trigger in handover procedure, due to mobile speeds and cell sizes. We analyze throughput, packet loss, and network delay - with respect to handover timeliness and accuracy. We conducted extensive experiments through the ns-2 simulator by adopting the Mobile IPv6 and IEEE 802.21 Media...
The trend nowadays is for the consumers to be able to view their multimedia content on a bigger/better display like HDTV instead of gathering around small displays like a laptop screen. Wireless Display is a method of transferring the multimedia content from the source device to the sink device- wirelessly. In this paper we evaluate the various wireless technologies available for Wireless Display...
High-speed, flexible and reliable detection schemes are the demands for today's communication systems while keeping in mind the complexity issues. In this comparative study; different detection schemes in UWB-MIMO systems have been analyzed. The V-BLAST algorithms with OSIC are briefly discussed and simulated to differentiate their performance by considering the multipath environment. In particular,...
Media streaming services are becoming extremely popular for end users with mobile devices. Peer-to-peer networking may be the solution to provide efficient streaming services for a large number of concurrent users without infrastructure. The client-server model costs a lot of money to manage and control and client heterogeneity also reduces the overall performance in mobile environments. Peer-to-peer...
Nowadays, Internet plays an irreplaceable role in almost every aspect of human life. However, it is also the popularity and increasing limitations which impede its development. Future Internet requires more flexible and more scalable architecture to support multiple parallel applications. Thus, how to select a suitable architecture at run-time to obtain the system optimum is a key problem in future...
The development towards ubiquitous network access requires innovative solutions to get remote areas included, especially rural areas of developing regions. The challenges include robustness of network components, poor or non-existent power supply and sustainable business models. We argue that large scale user-driven community networks are becoming technically viable to deploy in areas that are short...
In current telecommunication, how to communicate on the network is one of the important issues. Handover will occur for free movement of mobile node. Cellular network has covered a wide range but has a relatively narrow bandwidth. WLAN has a wider bandwidth but a relatively narrow range of services available. Heterogeneous handover will occur for free movement of mobile node. During the handover process...
This paper presents the Mobile Services Living Laboratory - a practical approach for evaluating service provision in cellular networks. Our approach promotes an end-to-end view of the system by providing an effective means to store information from both terminal and network sides, together with integrated mechanisms for retrieving feedback on user-perceived service quality. The current implementation...
Operation history middleware collects various operation data on smartphones. Because of privacy concerns about sensitive operation data, it needs to meet fine-grained collection needs including collection based on temporal-spatial conditions and temporary suppression of the collection of specific operation types. The on-demand collection method proposed herein dynamically determines the minimum collection...
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