The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For a long time, the risk of customer churn, i.e. to leave an operator, has been used as argument in favor of Quality or Experience (QoE) research. However, the understanding of how churn behavior and QoE are related is still limited. This is problematic, as customer retention and churn prediction have grown in importance in face of ever-growing competition on the telecom market. The work presented...
While the bandwidth and latency improvement of both WiFi and cellular data networks in the past decade are plenty evident, the extent of signal strength fluctuation and network disruptions (unexpected switching or disconnections) experienced by mobile users in today's network deployment remains less clear. This paper makes three contributions. First, we conduct the first extensive measurement of network...
In this paper, we describe the design and the implementation of a prototype mobile educational workbench for classical control and programmable logic controller (PLC) applications. It serves as a solution for the difficulties which technical students face in both classical and programmable controller laboratories. In addition, a comparison between the suggested solution and the traditional procedures...
Recently with the sharing economy of WiFi, IEEE 802.11 Wireless Mesh Networks (WMNs) have been deployed exponentially in more places. With the booming increase of density of APs as well as mobile clients (MCs), the handoff between MCs and APs becomes more frequent than ever before. One problem of most existing network-assisted fast handoff mechanisms is that an AP needs to switch to different channel...
Interference alignment (IA) is an efficient interference management technique that can result in sum-rates that scale linearly with the number of users at high signal-to-noise power ratio (SNR). But it is difficult to directly apply IA to large networks because of heavy signaling overhead and feasibility constraint. Clustered IA divides cells into disjoint clusters where IA is applied in each cluster...
This paper presents the design and test of 2×2 channel emulator, which is especially optimized for LTE-Hi testing. It adopts traditional convention method of the channel impulse response in time domain. The design features lower memory resource with sharing delay data buffering, which could reduce the cost of efficient VLSI Implement. In addition, Bidirectional design offers flexible and reliable...
In the machine to machine (M2M) propagation environment, beam direction changing technique for small antenna like dipole antenna size is required. We proposed to adopt meta-surface to achieve this instead of reflectarray. However, study of beam switching for meta-surface is not enough despite of important for mobile M2M. To address the issue, this paper proposes novel reflected beam switching method...
Recent development of wireless communication systems and standards is characterized by constant increase of allocated spectrum resources. Since lower frequency ranges cannot provide sufficient amount of bandwidth, new bands are allocated at higher frequencies, for which operators might resort for deploying more base stations to ensure the same coverage. Connecting increased number of base stations...
The aim of this study is to explore the possibility of using flux switching linear tubular machines in a free piston energy conversion (FPEC) system. In FPEC systems, acceleration and therefore speed are often relatively high, which impose to have a reduced number of poles, meanwhile the cogging force will be relatively high. In order to reduce the cogging force two techniques are combined. The analysis...
Summary form only given, as follows. A record of the panel discussion was not made available for publication as part of the conference proceedings. Hyperscale ethernet data centers (HEDCs) based on pure ethernet switching have come to dominate both the market and the conversation, and many think they are all that is necessary. But for many years specialized designs for HPC have survived, though these...
Nowadays traditional learning is getting changed to smart learning due to the advancement of smart classes. A smart classroom is a proficient method for instructing technique, active teaching methodologies are utilized as a part of the smart classroom. Time is one of the most challenging constraints faced by instructors teaching in smart classrooms, in our study we could find that this is mainly because...
Wireless local area network (WLAN) is a widely used wireless communication in recent years. Large scale shopping malls in the wireless local area network in the custom business positioning services are mostly accurate positioning to the store. However, the existing localization algorithms have many disadvantages, such as large signal acquisition, loss of signal and low precision when the scene is...
In this paper, we call for a paradigm shift away from the wireless-access focused research efforts on 5G networked systems. We believe that the architectural limitations should share equal blame on issues of performance, reliability, and security. We thus identify architectural weakness on both sides of the mobile clients and the 4G network infrastructure. Our recent findings show that, contrary to...
In non-diffusion-based mobile molecular communication networks, bio-nanomachines use non-diffusive surface-bound molecules to form trail networks in order to coordinate their behavior. In this paper, we consider three types of bio-nanomachine responsible for trail network formation: non-reactive, attractive and repulsive. All the three types of bio-nanomachine deposit trail-forming molecules in the...
As mobile social network has become an important component of people's daily life, it poses a significant challenge on knowledge workers' limited attention. However, studies on how mobile social network affects knowledge workers' attention management are lagging. In this research-in-progress, we attempt to fill the research gap by developing a research model to understand the underlying mechanism...
In a high movement environment, handover occurs frequently in a mobile network and degrades the quality of mobile communication and service. The shorter the handover delay is, the better the communication quality can be obtained. To shorten the handover delay for a bunch of UEs moving in the same direction, mobile relays (MR), an intermediate role between a UE and an eNodeB (eNB), have been introduced...
To deal with the distributed estimation for mobile sensor networks with switching topologies, an algorithm of the weighted average consensus-based cubature Kalman filtering is proposed by combining the advantages of the cubature Kalman filtering in information form and consensus algorithm. On the basis of the predecessors research work, the sufficient condition is presented for ensuring the weighted...
In this paper, we present a smart piggy bank that connects a traditional piggy bank to on-line bank account. In order to detect saving behavioral patterns, we used a simple needle switch that transfers information of inserted coins to the smart phone application through Bluetooth. The application helps the parents make a decision to transfer pocket money to the bank account linked to the smart piggy...
Providing infotainment services in Vehicular Adhoc Networks (VANETs) is a key functionality for the future intelligent transportation systems. However, the unique features of vehicular networks such as high velocity, intermittent communication links and dynamic density can induce severe performances degradation for infotainment services running on the six Service Channels (SCHs) available in the Dedicated...
This paper describes a system to mitigate the occurrence of "inadvertent roaming" (also called ‘false roaming') where a user's mobile terminal is in a roaming state (attached to a mainland Chinese network) even when geographically in Macao; such inadvertent roaming led to many complaints from local Macao users. It is clear from the tests that inadvertent roaming is an issue in Macao as modern...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.