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Theoretical values of throughput and latency parameters of 3G as well as 4G mobile networks are generally known from the standards. However, in praxis they depend on various aspects like radio signal coverage, number of connected users or moving speed of the terminal equipment. In this paper we present results of measurements conducted in Vienna, Austria. They were conducted for activities of AEROCEPTOR...
Mobile data networks exhibit highly variable data rates and stochastic non-congestion-related packet loss. These challenges result in key performance bottlenecks in current Transmission Control Protocol (TCP) implementations: bandwidth inefficiency and large end-to-end delay. This work addresses these challenges by first developing a Sliding Interval based Rate Adaptation (SIRA) that tracks bandwidths...
Opportunistic schedulers such as MaxRate and Proportional Fair are known for trading off between throughput and fairness of users in cellular networks. In this paper, we propose a novel solution that integrates opportunistic scheduling design principles and cooperative D2D communication capabilities in order to maximize fairness without sacrificing throughput. Specifically, we develop a mathematical...
Layered-Division-Multiplexing (LDM) technology has been shown to provide significant performance improvent for digital TV (DTV) broadcasting systems to simultaneously deliver a robust mobile TV service and one or more high-throughput fixed services in the same 6 MHz TV channel. So far, the focus of LDM for future DTV systems has been put on delivering mixed mobile and fixed services since this is...
This paper presents some end to end measurements of multimedia services carried out in the frame of LTExtreme project. We provide some understanding of the main parameters and the role of the different protocol layers in the achievement of the desired Quality of Experience (QoE). The trade-offs related to the adaptation algorithms that have been tested in a demonstrator are discussed, showing that...
In a D2D-enabled cellular system, not only can communications be relayed through the base station, but also closely located pairs are allowed to communicate directly over a D2D link, to support short-range data-intensive services. In this paper, we first formally state the problem of system throughput maximization subject to a given feasible lower bound for the users' SINRs in a D2D-enabled cellular...
Uploading of huge files to cloud servers through mobile communication has been becoming more popular in recent years. However, current uploading throughput is frequently limited due to bottlenecks in server processing ability and/or narrow bandwidth sections of networks. For this study, we aimed to improve the user experience of uploading in future wireless access environments. We propose a novel...
An incentive problem of ad hoc networks still remains for relaying frames from other nodes. By utilizing the Social Network System such as Twitter and Facebook, it is possible to estimate the degree of intimacy of friendship links not only to direct friends but also indirect friends such as friends-of-friends. If we provide links of ad-hoc network in relation to direct/indirect friends instead of...
This paper considers a problem of user and access point associations in heterogeneous wireless networks consisting of multiple radio access technologies. We propose a strategy for optimizing the problem that aims at maximizing the total minimal utility of users in the longer term. The minimal utilities can be obtained from bare essentials of the quality of experience and defined by considering different...
The growth of customers in 3G network has forced the operators to always optimize their network performances. One of the most concerned parameters to indicate the quality of network is the interference area. Especially in 3G network, this parameter is directly influenced by the number of users. Hence, it would be better if the operators can predict the areas experiencing interference before getting...
The rapid growth of high-speed transit systems, such as High Speed Rail (HSR), is putting considerable pressure on TCP-based data transmission. It is well known that TCP is suffering from severe throughput degradation in high-speed mobility scenarios. The root cause at the transport layer however remains unclear and largely undetermined to date. In this paper, we aim to pinpoint the throughput bottlenecks...
Today, data traffic grows in a more dynamic way than voice traffic and it requires high data rates to support advanced services and applications. Mobile operators must deal with this amount of traffic and must meet user requirements. They must provide more throughput on the transmission path. One of the ways this can be done is to use LTE-Advanced with the carrier aggregation technique. This is one...
The latest increase in number of smart user mobile devices and user expectations for high-quality rich media services has determined a growing demand for network resources, putting pressure on the existing network infrastructure. Dense Heterogeneous Networks (DenseNets) are a promising solution to this problem, supported by various individual networks and different technologies deployed within the...
We present our recent work investigating how mobility prediction can be exploited for improving the performance of mobile users in two directions: proactive caching requested content close to the network attachment points where a mobile has a high probability to connect to and DASH (Dynamic Adaptive Streaming over HTTP) video quality adaptation. For proactive caching we discuss a new model to proactively...
LTE-A addresses the challenges of coverage block holes and increase in user density with new features, such as small cell and femto cell. Small cell can be an inexpensive substitute to macro cell in coverage depleted areas. In contrast, heterogeneous network using femto cells with its ubiquitous coverage, can deliver high-speed data. Resource scheduling algorithm has an important role in determining...
In the context of a heterogeneous mobile environment, we analyze the eNodeB (eNB) Radio Link Control (RLC) buffer overflow problem for the 4G/LTE network, and show the benefits of deploying Active Queue Management (AQM) strategies at wireless access links. In order to satisfy the increasing demands of wireless mobile communications, LTE has been proposed as an all-IP-based network to bring higher...
Packet-based mobile networks are increasingly carrying internet traffic mostly for data intensive-applications. Mobile internet usage, with 67% share worldwide, is very important for mobile users. Because of the explosive growth of mobile data usage demand, data speed analysis is a very essential way to characterize network quality and user experience for service providers. Key Performance Indicators...
The demand for multimedia services in modern networks has experienced exponential growth in recent years and it is expected to dominate the mobile traffic in near future. On the other hand, the link capacity of mobile networks is limited due to the scarce wireless resources. Caching is a popular technique that uses available storage capability of the mobile devices to relieve this traffic tension...
The number of mobile terminals that have both a cellular interface and a Wi-Fi interface has been growing in the recent years. Meanwhile, Multipath TCP (MPTCP) that enables the simultaneous use of multiple paths with multiple TCP flows while showing just one regular TCP connection with the application has been standardized by the IETF and has drawn more attention recently. One feature of MPTCP is...
In this paper, a pilot reuse scheme has been considered for the uplink (UL) transmissions of a massive multiple-input multiple-output (MIMO) system. Subsequently, a lower bound on the throughput of the system, that uses a maximal ratio combining (MRC) receiver, has been derived, which is applicable for any number of antennas. The throughput, along with other metrics, has been used to differentiate...
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