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This work analyzes the impact of medium access control (MAC) layer on the performance of real-time cooperative positioning in ad-hoc mobile wireless networks. The probability mass function (pmf) of the latency introduced by the MAC layer is here derived to assess the influence of MAC parameters on the latency and then operate on those to improve the positioning performance while reducing the number...
The explosion of internet-like data traffic and services (voice, video, multiplayer games, download, etc.) is fueling the demands for higher mobile telecom network capacities. Traditionally, mobile operators are used to add new transmission links and equipments to satisfy the traffic increase. However, this solution is firstly expensive in terms of capital and operation and secondly inadequate with...
Deploying decode-and-forward relay nodes is a promising solution for LTE-advanced networks in order to meet the growing data rate demand and the challenging requirements for coverage extension. However, relay selection scheme plays a crucial role in enhancing the benefit of this technology. In this paper, we have proposed a new relay selection scheme which achieves a more balanced load in the network,...
We propose a new architecture for broadcasting an enormous amount of information over a large population of users in a typical urban area via multiple base stations for delay tolerant applications. The core idea is that each base station partially broadcasts the information instead of transmitting the whole information. In particular, the large target file is broken into M smaller chunks and is provided...
Measuring and predicting users quality of experience (QoE) in dynamic network conditions is a challenging task. This paper presents results related to a decision-theoretic methodology incorporating Bayesian networks (BNs) and utility theory for quality of experience (QoE) measurement and prediction in mobile computing scenarios. In particular, we show how both generative and discriminative BNs can...
LTE (Long Term Evolution) has been standardized in 3GPP (3rd Generation Partnership Project) to provide higher data throughput as well as lower latency for various IP based services including web browsing, VoIP (Voice over IP), video streaming and so on. In this paper, we evaluate the performance of TCP and UDP when handover is executed in an LTE system. The performance is degraded due to the interference...
Groups of people with mobile phones using short range connections like WiFi and Bluetooth to propagate messages can be modeled as, with regard to regular absence of end-to-end connection, Delay Tolerant Networks (DTNs). The study of message transmission speed in such kind of networks has attracted increasing attention in recent years. In this paper, we present a realistic framework to model the message...
With the introduction of LTE networks operators need to plan a new, IP-based mobile backhaul. In this paper, we provide recommendation on dimensioning LTE backhaul networks links using three methods: delay-, dimensioning formula- and overbooking factor-based. Results are obtained from OPNET simulations with traffic model based on traffic forecast for 2015. A delay-based approach gives recommended...
In this paper, we introduce distributed caching of videos at the base-stations of the Radio Access Network (RAN) as a way to reduce the need to bring requested videos from Internet CDNs, thereby reducing backhaul transmission, improving video quality of experience — delay and video stalling — and increasing overall network capacity to support more number of simultaneous video requests. Unlike Internet...
The new standard for DVB-RCS includes guidelines for mobile user in the market of aircraft, maritime and terrestrial. The standard suggests the possibility of using, in this scenario, a continuous carrier operation mode in the return channel beside the classical MF-TDMA mode. In this context it can be important a mechanism for switching between these two modalities in order to exploit in a better...
The 3GPP Long Term Evolution (LTE) is considered as a dominant future cellular wireless technology in terms of performance and user experience. With technological advancement of wireless networks, dependencies and business impact of mobile network services have also been increased phenomenally. It is, therefore, crucial to address issues regarding network infrastructure or service failure. In this...
Opportunistic networks is one of the fast developing research areas in mobile communications. Under opportunistic networks, mobile nodes try to communicate with other nodes without any prior information and knowledge about the network topology. Furthermore, network topologies are dynamic and can rapidly change. In addition, communication under opportunistic networks is erratic, thus routes between...
Opportunistic routing protocols have been widely explored to improve the performance of multi-hop communication. However, most existing opportunistic routing protocols face several challenges such as low efficiency in mobile wireless sensor networks (WSNs), diverging, long latency etc. In this paper, a new geographically opportunistic routing protocol (GOR) is proposed to tackle these challenges....
Adaptive Modulation and Coding (AMC) is one of the most promising techniques to cope with the dynamic fading of wireless channels, adopted by emerging standards such as LTE and WiMAX. In satellite communications, the upper bound of AMC adjustment period is determined by both long round-trip delay and different channel coherence time. In this paper, the impact of AMC adjustment period in mobile satellite...
Performing activity recognition using the information provided by the different sensors embedded in a smartphone face limitations due to the capabilities of those devices when the computations are carried out in the terminal. In this work a fuzzy inference module is implemented in order to decide which classifier is the most appropriate to be used at a specific moment regarding the application requirements...
Quality-of-information (QoI) in sensor networks measures attributes such as accuracy, timeliness, completeness and usefulness of data ultimately delivered to users. It is a challenge to provide the required QoI in mobile sensor networks given the large scale and complexity of the networks with heterogeneous mobile and sensing devices. In this paper, we provide a comprehensive study on major QoI metrics...
We study the scaling properties of a georouting scheme in a wireless multi-hop network of n mobile nodes. Our aim is to increase the network capacity quasi linearly with n while keeping the average delay bounded. In our model, mobile nodes move according to an i.i.d. random walk with velocity v and transmit packets to randomly chosen destinations. The average packet delivery delay of our scheme is...
In this paper, we study the performance of some of the key scheduling algorithms such as Proportional Fair Scheduler, Modified Longest Weighted Delay First and Exponential Rule. We also propose a new algorithm called EXPQW, a variant of the Exponential rule which assigns weights to the subscriber stations based on their queue length and waiting time thereby ensuring fairness and quality of service...
Current market trends have enabled mobile users to rely increasingly on wireless devices to receive and stream video applications in their daily lives. These multihomed devices are capable of changing point of connection while roaming in current heterogeneous wireless networks, due to their multi-access radio interfaces. However, services handover between two wireless cells of same radio access technology...
In the literature, one of the key assumptions in characterizing the scaling laws for wireless mobile networks, is to assume that nodes do not communicate while being mobile. In other words, contact opportunities are not considered during the mobility process itself. However, we find that this assumption leads to an inflated estimate of the delay, even in an order sense. To address this issue, a new...
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