185 research outputs found
Project Final Report – FREEDOM ICT-248891
This document is the final publishable summary report of the objective and work carried out within the European Project FREEDOM, ICT-248891.This document is the final publishable summary report of the objective and work carried out within the European Project FREEDOM, ICT-248891.Preprin
Wireless Broadband Access: Policy Implications of Heterogeneous Networks
A wireless heterogeneous network can help increase the access transmission speed and contribute thereby to the broadband deployment policies of administrations and telecommunications operators. Given the technical particularities of wireless heterogeneous networks, the deployment of wireless heterogeneous networks raises a number of challenges that need to be addressed by regulatory authorities. This article analyses the following regulatory implications: standardisation and technology neutrality, spectrum management, market analysis, open access and infrastructure sharing, interconnection pricing and charging, broadband deployment policies, and privacy and security issues. --4G,heterogeneous networks,cooperative networks,spectrum management,regulation,wireless networks
A comparative investigation on the application and performance of Femtocell against Wi-Fi networks in an indoor environment
Due to the strenuous demands on the available spectrum and bandwidth, alongside the ever increasing rate at which data traffic is growing and the poor quality of experience QoE) faced with indoor communications, in order for cellular networks to remain dominant in areas pertaining to voice and data services, cellular service providers have to reform their marketing and service delivery strategies together with their overall network rchitecture. To accomplish this leap forward in performance, cellular service operators need to employ a network topology, which makes use of a mix of macrocells and small cells, effectively evolving the network, bringing it closer to the end-‐user. This investigation explores the use of small cell technology, specifically Femtocell technology in comparison to the already employed Wi-‐Fi technology as a viable solution to poor indoor communications.The performance evolution is done by comparing key areas in the
every day use of Internet communications. These include HTTP testing, RTP testing and VoIP testing. Results are explained and the modes of operation of both technologies are compared
Femtocell Networks: A Survey
The surest way to increase the system capacity of a wireless link is by
getting the transmitter and receiver closer to each other, which creates the
dual benefits of higher quality links and more spatial reuse. In a network with
nomadic users, this inevitably involves deploying more infrastructure,
typically in the form of microcells, hotspots, distributed antennas, or relays.
A less expensive alternative is the recent concept of femtocells, also called
home base-stations, which are data access points installed by home users get
better indoor voice and data coverage. In this article, we overview the
technical and business arguments for femtocells, and describe the
state-of-the-art on each front. We also describe the technical challenges
facing femtocell networks, and give some preliminary ideas for how to overcome
them.Comment: IEEE Communications Magazine, vol. 46, no.9, pp. 59-67, Sept. 200
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Radio network management in cognitive LTE-Femtocell Systems
This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University London.There is a strong uptake of femtocell deployment as small cell application
platforms in the upcoming LTE networks. In such two-tier networks of LTEfemtocell
base stations, a large portion of the assigned spectrum is used
sporadically leading to underutilisation of valuable frequency resources.
Novel spectrum access techniques are necessary to solve these current spectrum
inefficiency problems. Therefore, spectrum management solutions should have
the features to improve spectrum access in both temporal and spatial manner.
Cognitive Radio (CR) with the Dynamic Spectrum Access (DSA) is considered
to be the key technology in this research in order to increase the spectrum
efficiency. This is an effective solution to allow a group of Secondary Users
(SUs) to share the radio spectrum initially allocated to the Primary User (PUs) at
no interference.
The core aim of this thesis is to develop new cognitive LTE-femtocell systems
that offer a 4G vision, to facilitate the radio network management in order to
increase the network capacity and further improve spectrum access probabilities.
In this thesis, a new spectrum management model for cognitive radio networks is
considered to enable a seamless integration of multi-access technology with
existing networks. This involves the design of efficient resource allocation
algorithms that are able to respond to the rapid changes in the dynamic wireless
environment and primary users activities. Throughout this thesis a variety of
network upgraded functions are developed using application simulation
scenarios. Therefore, the proposed algorithms, mechanisms, methods, and system
models are not restricted in the considered networks, but rather have a wider
applicability to be used in other technologies.
This thesis mainly investigates three aspects of research issues relating to the
efficient management of cognitive networks: First, novel spectrum resource
management modules are proposed to maximise the spectrum access by rapidly
detecting the available transmission opportunities. Secondly, a developed pilot
power controlling algorithm is introduced to minimise the power consumption by
considering mobile position and application requirements. Also, there is
investigation on the impact of deploying different numbers of femtocell base
stations in LTE domain to identify the optimum cell size for future networks.
Finally, a novel call admission control mechanism for mobility management is
proposed to support seamless handover between LTE and femtocell domains.
This is performed by assigning high speed mobile users to the LTE system to
avoid unnecessary handovers.
The proposed solutions were examined by simulation and numerical analysis to
show the strength of cognitive femtocell deployment for the required
applications. The results show that the new system design based on cognitive
radio configuration enable an efficient resource management in terms of
spectrum allocation, adaptive pilot power control, and mobile handover. The
proposed framework and algorithms offer a novel spectrum management for self organised LTE-femtocell architecture.
Eventually, this research shows that certain architectures fulfilling spectrum
management requirements are implementable in practice and display good
performance in dynamic wireless environments which recommends the
consideration of CR systems in LTE and femtocell networks
Mobile Networks
The growth in the use of mobile networks has come mainly with the third generation systems and voice traffic. With the current third generation and the arrival of the 4G, the number of mobile users in the world will exceed the number of landlines users. Audio and video streaming have had a significant increase, parallel to the requirements of bandwidth and quality of service demanded by those applications. Mobile networks require that the applications and protocols that have worked successfully in fixed networks can be used with the same level of quality in mobile scenarios. Until the third generation of mobile networks, the need to ensure reliable handovers was still an important issue. On the eve of a new generation of access networks (4G) and increased connectivity between networks of different characteristics commonly called hybrid (satellite, ad-hoc, sensors, wired, WIMAX, LAN, etc.), it is necessary to transfer mechanisms of mobility to future generations of networks. In order to achieve this, it is essential to carry out a comprehensive evaluation of the performance of current protocols and the diverse topologies to suit the new mobility conditions
Vulnerabilities of signaling system number 7 (SS7) to cyber attacks and how to mitigate against these vulnerabilities.
As the mobile network subscriber base exponentially increases due to some attractive offerings
such as anytime anywhere accessibility, seamless roaming, inexpensive handsets with sophisticated
applications, and Internet connectivity, the mobile telecommunications network has now become
the primary source of communication for not only business and pleasure, but also for the many life
and mission critical services. This mass popularisation of telecommunications services has resulted
in a heavily loaded Signaling System number 7 (SS7) signaling network which is used in Second
and Third Generations (2G and 3G) mobile networks and is needed for call control and services
such as caller identity, roaming, and for sending short message servirces. SS7 signaling has enjoyed
remarkable popularity for providing acceptable voice quality with negligible connection delays, pos-
sibly due to its circuit-switched heritage. However, the traditional SS7 networks are expensive to
lease and to expand, hence to cater for the growing signaling demand and to provide the seamless
interconnectivity between the SS7 and IP networks a new suite of protocols known as Signaling
Transport (SIGTRAN) has been designed to carry SS7 signaling messages over IP.
Due to the intersignaling between the circuit-switched and the packet-switched networks, the mo-
bile networks have now left the “walled garden”, which is a privileged, closed and isolated ecosystem
under the full control of mobile carriers, using proprietary protocols and has minimal security risks
due to restricted user access. Potentially, intersignaling can be exploited from the IP side to disrupt
the services provided on the circuit-switched side.
This study demonstrates the vulnerabilities of SS7 messages to cyber-attacks while being trans-
ported over IP networks and proposes some solutions based on securing both the IP transport and
SCTP layers of the SIGTRAN protocol stack
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