Unified communications has enabled seamless data sharing between multiple devices running on various platforms. Traditionally, organizations use local servers to store data and employees access the data using desktops with predefined security policies. In the era of unified communications, employees exploit the advantages of smart devices and 4G wireless technology to access the data from anywhere and anytime. Security protocols such as access control designed for traditional setup are not su ﬃ cient when integrating mobile devices with organization’s internal network. Within this context, we exploit the features of smart devices to enhance the security of the traditional access control technique. Dynamic attributes in smart devices such as unlock failures, application usage, location and proximity of devices can be used to determine the risk level of an end-user. In this paper, we seamlessly incorporate the dynamic attributes to the conventional access control scheme. Inclusion of dynamic attributes provides an additional layer of security to the conventional access control. We demonstrate that the e ﬃ ciency of the proposed algorithm is comparable to the e ﬃ ciency of the conventional schemes.
As indicated above, multiple receive antennas are advan- tageous for cancellation of cochannel interference. However, due to cost and size limitations it is still a challenge to include more than one transmit antenna into a mobile terminal. Therefore, single antenna interference cancellation (SAIC) algorithms have received significant attention in academia and industry in recent years, especially for transmission with single-carrier modulation (cf. [9–11]). The benefits of SAIC were analyzed in  for GSM radio networks, and it has been shown that GSM network capacity can be dramatically improved by SAIC.
Wireless network: Nodes can promiscuously eavesdrop on communications by others. Collisions can be intentional or accidental. With high mobility routes are not valid over extended periods of time. Link errors can be ambiguous, communications can fail due to a node having moved out of range or due to an intentional interruption. Routing protocols lack security. Most of the proposed routing protocols, such as DSR  and AODV , do not provide any security. Routing messages can be modified or fabricated, sent at inappropriate times or be omitted when needed. Truly mobile and not merely portable devices have to be reasonably small and lightweight and therefore are often assumed to have limited battery power. This results in communications and computations being relatively expensive in power, opening the door to attacks aiming at excessive resource consumption of the target node, selfish behavior of resource conscious nodes, and limited ability to perform cryptographic computations.
communications equipment and information technology that fits easily in a standard Sport Utility Vehicle (SUV), boat, trailer, or small aircraft. The team’s current operational version of MITOC which responds to actual emergencies is housed in a Chevrolet Suburban SUV called the Mobile Telecommunications Equipment Laboratory, or METL. Thirty minutes after arrival at a scene MITOC transforms into a robust, modern command post equipped with satellite based voice and data communications, a wireless local area network (LAN), portable phones for local or long distance calls, laptop computers, radio interoperability equipment, and other systems essential for organizing and executing emergency management and crisis response. The MITOC modules can be operated right from the transporting
In a device-to-device wireless multi-hop communication scenario with resource-constrained devices, the energy efficiency of communication plays a significant role in network design and operation. Based on the recently proposed Glossy network flooding approach, we introduce cooperation between transmitting nodes and formulate a robust multicast beamforming problem with imperfect channel state information (CSI) and analyze its performance. The level of cooperation is dependent on the number of limited feedback bits from receivers to transmitters. First, the impact of the number of limited feedback bits B on energy efficiency is studied, and the programming problem for finding the optimal B is formulated subject to a maximum outage constraint of 5%. Numerical simulations show that there exists an optimal number of feedback bits that maximizes energy efficiency. Second, the effect of the number of cooperating transmitters on energy efficiency is investigated. Results show that an optimum group of cooperating transmit nodes, also known as a transmit coalition, can be formed in order to maximize energy efficiency. Results show that the investigated techniques including optimum feedback bits and transmit coalition formation can achieve a 100% increase in energy efficiency when compared to the state-of-the-art Glossy under the same operation
AVNotes.com is the result of more than 18 months development and customer feedback on their requirements of a business-wide communications solution. It has been developed with Wireless Communication as a priority and provides portability while using any preferred Internet device, laptop, mobile phone or palmtop… With no Software to download! A software licence enables an ASP (Application Service Provider) to brand AVNotes.com with their own ‘Product Name’ thus giving them the power to deliver a communications and collaboration tool that has a level of sophistication unheard of to date.
The move to NFV offers operators several advantages like cost savings, scale and efficiency with regard to their networks. Deploying common, off-the-shelf (COTS) server hardware and virtualization software is potentially less expensive than purchasing dedicated hardware for each network node or function. System capacity can also be scaled up or down almost instantly depending on demand. Redundancy and high-availability features are often inherent in the data center infrastructure, and would not have to be duplicated, as is the case in many network functions today. While we are at the very early stages of IT and data center technology spreading to operator core networks, we believe that this architectural transition is generational and will happen gradually over the next decade.
Isolation of local exhaust plumes is of interest for studies that seek to estimate emission factors but also to minimize the impact of sporadic proximate exhaust when determining spatial trends of near-source air pollution. For spatial trend analysis, a variety of strategies have been utilized to mini- mize bias from incidental local exhaust (Table 2), including using summary statistics less affected by outliers (e.g., per- centiles) or algorithms developed to detect brief excursions in the time series. Estimating background is a second key feature of interest to isolate in mobile air monitoring time se- ries. Background air quality often varies diurnally and daily due to meteorology and long-distance transport of pollution. Accounting for the variable background may be conducted through optimal sampling design where an area representa- tive of background is frequently sampled (e.g., Van Poppel et al., 2013). However, when a route completion exceeds the time frame within which the regional background changes or comparisons are being made between multiple routes mea- sured on different days, additional strategies are needed. An alternative approach is to assume the baseline of the time se- ries – represented simply as a low percentile of the data range or a more sophisticated time-varying baseline – is represen- tative of background.
Wireless sensor network usage is growing in many part of modern life. The application that has different usage in Military or applications that have an impact on daily life like weather control systems is growing every day. Sensor nodes are a new concept that will affect daily life and for sure security is one crucial part of it (Huang, Bai, & Chen, 2007). Network layer security can strengths the reliability of sensor network since many attacks happen in the network layer. In sensor nodes, data transmission happen through air so the intruder can eavesdrop or act as a malicious router. This will stop packets delivery to destination and decrease reliability of the network. There are many researches to give security to available routing protocols. Also, the existing routing protocols with support mobility often designed with no security in mind; so later other researchers tried to add security function to these protocols. Extra and new functionality (even security) sometimes bring other vulnerability. The Secure-SPIN is a routing protocol with support mobility that branched from SPIN protocol; the Spin protocol has no security, but Secure-SPIN tries to add security to it. During this extra functionality, the Secure-SPIN keeps its vulnerability to eavesdropping as SPIN does. The purpose of this study is to solve vulnerabilities of secure-SPIN to have more security than existing one.
Data is collected, processed and served by the KMS which is built with the open-source Drupal content management system. Drupal Mobile is used to serve content to mobile devices. Usability is key, since as stated previously, many users have no ICT knowledge. Therefore real-time and archived data must be presented using simple interfaces. This development is a joint effort between the University of Nairobi which is undertaking mobile application and interface development, the University of Bradford which is working on server setup and administration, and the London Knowledge Lab which focuses on educational end use. The KMS is described in greater detail in Wirastuti, et al . The system is initially tested in a deployment at Kew Gardens, a large public botanic garden in London. This deployment will include interpretative data made available to the public both over the web and via Bluetooth broadcast locally in two test plots in which similar crops are grown.
Several resources allocation schemes have been proposed to improve system performance in integrated voice wireless networks. Tang et al  proposed a scheme which combined the queuing strategy and priority control to improve the performance of multi-class calls in multi- service personal communications services. The continuation of an active call is one of the most important quality measurements in cellular systems. The reason why handoffs are critical in cellular communication systems is that neighboring cells are always using a disjoint subset of frequency bands, so negotiations must take place between the mobile station (MS), the current serving base station (BS), and the next potential BS . Handoff process enables a cellular system to provide such a facility by transferring an active call from one cell to another.
The “bring your own device” (BYOD) is the concept of encouraging people for bringing their own devices to work or study and is gaining popularity in both corporate and educational environments. The concept of BYOD is beneficial for the education sector due to its cost saving ability for the institutes and providing the comfort of using personal devices. The rapid and accelerating move towards the adoption and use of mobile devices has increasingly provided students and teachers the ability to study on the move. The colleges and universities have been adapting their networks and policies to accommodate personal mobile computing devices for quite some time. Since the time laptops became affordable and smartphones and tabs are a common possession, undergraduate and graduate students have been bringing their own devices to campus. Wireless and mobile technologies influence the evolution of the teaching and learning and press forward the development of new mode of education enabling anytime, anywhere and anyhow learning. New wireless technologies can be used to boost interactivity, thus helping people to remain online even while on the move. The institutions need to develop a learning platform suitable to support Bring Your Own Device (BYOD). Institutions that are proactive in their approach towards BYOD will stand a chance to gain critical benefits from its implementation. A Mobile Ad Hoc Network (MANET) is defined as a collection of two or more nodes connected with each other through some kind of wireless communications and networking capability that enables them to communicate with each other without the need of any centralized server. This enables the wireless nodes to dynamically form a network to exchange information without using any existing fixed network infrastructure. The main advantages of MANET are robustness, flexibility and mobility. In this paper we have explored the possibility of implementing BYOD in a university set up through MANETs.
Beyond Sponsorship, Business Transformation Creates New Revenue Streams Although media partnerships, sponsorships, ticketing, and merchandising have long been revenue mainstays, few teams or venues are able to maximize their full potential. Using networking and communications technology within the venue allows traditional revenue streams to evolve, enabling next-generation business models that exceed what sponsorship dollars alone represent. For example, electronic ticketing encourages ticket upgrades and creates profitable secondary ticket resell value. Dynamic high-definition video offerings enable customization of digital content for each stadium level, type of fan, and type of event to maximize effectiveness. Live game video can be mixed with advertisements, targeted promotions, and information about upcoming events to encourage sales. Previously static concession boards can become customized digital signs that reflect the event and its demographics -- offering sodas and juices for kid-friendly afternoon events and alcohol and gourmet foods for evening adult events. They can even be linked to inventory systems so that out-of-stock menu items are removed and prices automatically changed toward the end of the event to move excess supply. Even luxury suites can be outfitted to put all venue services at fans’ fingertips during games, creating a premium price for the suite and transforming it into a fully equipped business center for non-game days. Network-based technology can also help generate new revenue by making it easier for the venue to accommodate a wider variety of new tenants, and linking customer data can improve everything from ticket sales to inventory
This report has been prepared solely for the purposes of assisting Telenor ASA in quantifying the economic impact of the mobile industry in Serbia, Ukraine, Malaysia, Thailand, Bangladesh and Pakistan. The distribution of this document to other parties is subject to the restrictions on use speciﬁ ed in the Engagement Letter dated 26 September 2007. We have agreed that Telenor ASA may publish this report in its entirety or for a speciﬁ c country by deleting only the executive summary and ﬁ ndings chapters for the other 5 countries and inserting the liability notice provided as Annex 7 to this report. No other party other than Telenor ASA is entitled to rely on this document for any purpose whatsoever and we accept no responsibility or liability to any other party in respect of the contents of the Report. Deloitte & Touche LLP accepts no responsibility for any reliance that may be placed on this document should it be used by any party other than the Recipient Parties or for any purpose that is not in accordance with the terms of the Engagement Letter.
Wireless Mesh/Sensor Networks (WMN): A WMN is dynamically self-organized and self configured, with the nodes in the network automatically establishing and maintaining mesh connectivity among themselves (creating, in effect, an ad hoc network). WMNs consist of mesh routers and mesh clients, with mesh routers wireless routers relaying each others' packets in a multi hop fashion. WMNs are a modular and suitable solution when it comes to rapidly deploying a dynamic and scalable network within defined boundaries. Wireless mesh networks have the potential to deliver Internet broadband access, wireless local area network coverage and network connectivity for stationary or mobile hosts at low costs both for network operators and customers. Adoption of these networks is rapidly growing along with advanced research being carried for higher functionality in wireless services.
Due to Mobile Computing Any portal system support user mobility. We can access any mail from anywhere. We may not be able to access the same mail through some other device like a fixed phone. As a result of mobility the attributes associated with devices, network, and users are constantly changing. These changes imply that context & behavior of applications needs to be adapted to suit the current environment. There are several ways in which Context and behavior can be adapted. One Way is to build applications without any context or behavior awareness. The offline and real-time computing environment will move with the user. In real time mode user will be able to use all its remote data services online.
Mobile Ad hoc Networks (MANET) are characterized as an infrastructure-less communication networks formed among a set of stranger nodes. Service Discovery is a challenging problem in such networks due to their non-deterministic and improvised nature. This manuscript addresses two main issues related to service discovery in MANET i.e. consistency management and knowledge representation. Consistency management i.e. the problem of maintaining a coherent view of the services in the network is a taxing job due to the sharp variations in the service availability information in MANET. Similarly, the lack of a standard mechanism for representation of data and resources on the network engenders syntactic and semantic interoperability issues during discovery of services. The use of a colossal schema to describe the services can resolve the issue of non- interoperability, but this approach is certainly not viable because of the limited capabilities of nodes. In view of these challenges, this paper presents a robust and scalable network layer semantic service discovery scheme. A network layer service discovery scheme is presented that finds out the requested service jointly with the corresponding route to the provider of service. For ensuring the robustness of the process, a network layer consistency management scheme is also proposed that maintains the valid state of the services by exploiting the vigilance of network layer. To solve the knowledge representation issue, we recommend a scalable multi-tiered approach based on a general purpose ontology called Software Ontology for Ad hoc and Vehicular Network Applications (SLAVE). The multi-tiered approach keeps a portion of global schema at individual nodes of the network and advocates progressive growth of schema information. The proposed scheme has been simulated in JIST/SWANS simulator. The simulation results assert the robustness and scalability of the consistency manager and knowledge representation scheme respectively.
Abstract: A MobileNetwork is most dynamic and public network that is available to all users. As the network is distributed in large network area with number of associated communication technologies as well as protocols, the communication becomes a challenge in this network. Along with the architectural and the communication challenges, other challenges included here is the attack performed by internal and external nodes. These attacks are either performed to destroy the information or to reveal the communication information from the network. The aim of this paper to explore these challenges those are present in mobilenetwork. The work is about to aware about these challenges to a researchers so that the algorithmic approach or the optimization will be performed under the light of these challenges.