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The increasing popularity of file sharing systems was practically grounded by music recordings becoming widely available. The successful introduction was closely followed by new systems, all utilizing search methods essentially based on meta-data. In this article a measure for audio similarity is proposed. The frequency of the amplitude values of the sound wave signal is determined and utilized in...
Dynamic admission control is an important mechanism to guarantee end-to-end quality of service (QoS) for specific Internet protocol (IP) traffic flows in multiprotocol label switching (MPLS) networks. Most of the solutions proposed in the literature target to satisfy the QoS constraints for the new request without considering them for the already admitted flows in the network. In this paper, we propose...
In this paper, we address the global problem of designing reliable wavelength division multiplexing (WDM) networks including the traffic grooming. This global problem consists in finding the number of optical fibers between each pair of optical nodes, finding the configuration of each node with respect to transponders, finding the virtual topology (i.e., the set of lightpaths), routing the lightpaths,...
GSM network planning requires frequent assessments of cell blocking probabilities in potential network variants under the prospective load, in order to identify a cost-efficient configuration meeting the coverage and capacity targets. Such assessments must take into account that in the prevailing multi-layer GSM network architectures, handover mechanisms balance the load among the layers in order...
This paper describes the QoS features that will transform the access networks landscape in order to bring “‘Broadband’” as a commodity while setting up the pillars of the “‘Future Media Internet’”. Quality of Experience is obviously key for emerging and future services. Broadcasting services will first need to equal the QoE of their counterparts in the Open-air market (for IP-TV examples would be...
Network capacity planning and analysis is usually done in a static way, point to point, with an optimal network design developed by dimensioning nodes and links to handle end-to-end network traffic demands. There is little consideration for disaster event planning except for some redundancy built into the network design. We propose doing network capacity planning using a dynamic simulation network...
Space-Time coding is widely used in wireless communication systems, in order to provide diversity gain and overcome fading effects of multipath propagation, also by using channel codes, such as Convolutional, Turbo and LDPC coding, we can increase coding gain and obtain performance result near to Shannon limit. In this paper, we consider the concatenation of LDPC coding as outer code and Alamouti'sG...
EV-DO Revision A, with its significantly higher carrier spectral efficiencies and data throughput enables VoIP, Video Telephony (VT) and other IMS applications to generate substantive value for telecom operators. In addition to preparing the operator network for future technology, these applications provide additional revenue opportunities while simultaneously bringing down both capital and operating...
The objective of this work is to provide the main elements to support the fact that Mexico has not increased its levels of competitiveness and it neither has equaled to other countries in the region. Therefore, it is required to implement comprehensive reforms in sectors such as education, infrastructure, healthcare, information technologies and telecommunications, among others. Some of the difficulties...
Multiprotocol Label Switching (MPLS) Point to Multipoint (P2MP) can be used as an underlying technology for transmitting video data. Reducing the transmission delay on a network is very important to maintain the quality of service for video transmission. Therefore, the hop count of the path between a source and a destination node should be reduced using MPLS P2MP routing technology. We considered...
In this paper, we tackle the design problem of reliable internet protocol (IP) networks with a three-level (access/edge/core) hierarchical structure. This problem consists in selecting the number of routers and their types to install at each level, selecting the port types to install in each router, finding the access, edge and core networks, selecting the link types and routing the traffic within...
A network has its own peculiar Quality-Of-Service (QoS) class and QoS mechanism. So, to support end-to-end QoS in heterogeneous network, a certain unified control is needed as Bandwidth Broker (BB) and QoS management servers (such as RACF). However, it causes scalability problem as management complexity and implementation difficulty. There is a strong need to provide simple QoS interoperability so...
Multi-layer aspects of network and traffic engineering have been extensively studied from various perspectives and potential benefits for savings in capital and operational expenditures have been demonstrated. Integrated approaches for traffic engineering and network planning come closer towards a practical implementation with the progress in standardization of protocols like generalized multiprotocol...
This work presents a new algorithm for Dynamic Spectrum Management (DSM) in Digital Subscriber Lines. Previous approaches have achieved high performance by attempting to directly solve or approximate the multiuser spectrum optimisation problem. These methods suffer from a high or intractable computational complexity for even a moderate number of DSL lines. A new method is proposed which is a heuristic...
This paper presents the design and describes the advantage of the state-of-the-art Mobile Integrated Conditional Access System (MICAS) concerning interoperability, personalisation, security and operational costs in Pay-TV systems. The Message Handling Subsystem is proposed and outlined together with ‘Follow-Me’ service, which proposed herewith to extend mobility and personalisation concepts on Pay-TV...
This article presents the benefits for Telco operators by introducing a Service Oriented Infrastructure (SOI) as basic fundament of NGN services in a converging Telco and IT market.
The example of a business case for WiMAX vs DSL in rural areas is used to tell a typical story of how business models must evolve across technology, geography and economics, and how business-modelling tools have developed functionality to meet these requirements.
This paper is aimed at studying and evaluating the performance of an algorithm suitable for load control enhancement in “Session Initiation Protocol” servers. The proposed algorithm exploits a mechanism based on different values of threshold to check the overload status of the controlled server. The paper shows that the performances are improved when the algorithm works with more thresholds instead...
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