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Radiation power from the base station is highly hazardous to the human health. Macro cell environment with the aim of providing better QOs services to the mobile user are careless about the radiation power. Femto cell is an emerging cellular concept which can cater to the need the required QOs and at the same time with the base stations radiating less power. In this paper, an UMTS network with Macro...
Wireless network is based on packet switching concept and is capable of handling various types of applications. The challenge is to attain a better Quality of Service (QoS) for the like applications of real time and non-real time in an intriguing environment with varying bit rate, unexpected channel lay off. The intention of QoS provision is to afford the opted services for the users while utilizing...
In the past few years, the telecommunications field experienced a rapid evolution on two main grounds: Multiple mobile network interface terminals, and mobile radio technologies. The needs of the users in terms of flow and mobility are in constant increase, making it necessary to develop a new generation of networks. The latter would be a heterogeneous wireless environment in which different access...
In recent years, achieving world-wide multimedia wireless services has received wide-spread attention and is the most desired objective of service providers of telecommunication networks. Thus, a significant amount of research efforts is devoted to broaden the wireless services over the globe. In this context, satellite component plays a pivotal role in extending and enhancing the existing Universal...
Mobile applications are dominant in today's cellular networks (Mobile Internet), which demand frequent and intensive mobile data access services. Popular applications like instant message and social network apps require a long-lived connection to the backend server which periodically sends small “keep-alive” messages to maintain the connected app session. Existing research has revealed that the keep-alive...
This paper presents an analysis of the factors affecting coverage and capacity estimation in cellular networks of third generation (3G) technology using wideband code division multiple access (WCDMA). Particularly in WCDMA systems, the main source of interference by coverage is the overlapping between cells, affecting the capacity of system. To analyze the factors affecting the capacity of a WCDMA...
Data usage is surging in wireless networks and operators are quickly moving from second generation/third generation (2G/3G) networks towards 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) which is expected to provide significant data capacity and latency improvements. In this paper, we examine the benefits of a complete transition from mixed 2G/3G/LTE networks to an all- LTE network...
The use of commercial off-the-shelf (COTS) technologies in military environment is attractive, but in tactical communications, one of the biggest challenges is the jamming/interference tolerance of the deployed systems. Interference tolerance is important also in public authority and in some special civilian wireless network set-ups. We present an experimental measurement-based study on jamming tolerance...
Integration of different wireless networks can provide a universal ubiquitous coverage and various transmission rates for Mobile Terminals (MTs). To achieve ubiquitous computing, an MT needs to switch or handoff its connection between different or similar types of wireless networks. Our previous work used NDMD (Network Discovery based on user Motion Detection) that triggers network discovery based...
Vertical handoff (VHO) is the key feature to increase the seamless services availability (i.e., cloud services) in a heterogeneous network environment that especially plays an important role in emergency use cases for reliable information retrieval. For precise handoff decisions, latest proposed vertical handoff decision algorithms (VHDA) are, however, too complex and do not consider the restricted...
The objective of this paper is to study the latest mobile technologies such as HSDPA (High Speed Downlink Packet Access) or 3.5G, and an approach to its successor LTE (Long Term Evolution) or 4G using network simulator called NS-2. First 2G technology came into existence which enabled mobile users with the technologies such as GSM, TDMA and CDMA. It also provided SMS services. After 2G many advanced...
The mobile phones to which high-speed data transmission became possible over the 3rd generation mobile communication network are rapidly shifted to smart-phones with the advent of Android OS and iOS over the world. This worldwide trend brings major impacts on mobile communication operators, especially massive traffic expansion, and accommodating huge traffic becomes most important issue.
The end to end system data performance over a 3G cellular network depends on many factors such as the number of users, interference, multipath propagation, radio resource management techniques as well as the interaction between these mechanisms and the transport protocol's flow and congestion mechanisms. Using controlled experiments in a public cell site, we investigate the interaction between TCP...
In this paper, the performances of hybrid automatic repeat request (HARQ) technique are evaluated using Monte Carlo simulation process. The analysis is done for the case of Nakagami-m fading channel, when Universal Mobile Telecommunication System (UMTS) turbo code is used. HARQ procedure performance are determined for several values of distribution parameter m, in the case of independent and time...
Next generation wireless network (NGWN) is expected to integrate different access technologies, including cellular network, WLAN and mobile Ad Hoc network, etc., and to support users' seamless communication among different access networks. However, the heterogeneity and the diversity of access networks propose challenges on user handoff performance enhancement and system performance guarantee. In...
In this paper we investigate limitations facing high rate transmission in the downlink of UMTS systems. A solution is proposed based on space-time filtering to allow parallel channel transmission and spreading code reuse. The optimum receiver is derived taking into consideration non-ideality in space-time filtering caused by channel estimation errors. Comparisons with ordinary CDMA receivers, based...
Wireless technologies have been widely deployed in the last decade making users demand for continuous connectivity. Users not only demand being attached to a network, but possibly to the one with the highest performance, or at least to a network able to fulfill their requirements. To choose the best network among different candidates, the IEEE 802.21 standard has been developed. In this paper we aim...
In this document we show the evaluation of an already introduced handover management solution which can be used to provide ubiquitous connections and seamless Internet access. The new solution makes use of GNSS location information and previous records of network parameters. The method exploits the benefits of multihomed mobility configurations. Based on actual GNSS coordinates and previously recorded...
Qos provision is considered as the complex task due to the heterogeneous nature, diverse QoS requirements of emergent different applications. With the advent of high bandwidth 3G/4G technologies, like LTE, LTE-advanced, the necessity of QoS provision becomes even crucial. Uplink scheduling with QoS provision is considered here. The contribution of this work is uplink packet scheduling scheme maintaining...
Today's laptops and mobile terminals are equipped with several network interfaces belonging to different access technologies. Users can benefit from multi-homing to access network services anywhere, at any time and from any network. Multipath TCP (MPTCP) is a modified version of Transmission Control Protocol (TCP) which allows a TCP connection to simultaneously send data over multiple paths. One of...
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