Current Issue : January - March Volume : 2015 Issue Number : 1 Articles : 5 Articles
The rapid growth of the mobile telecommunication sectors of many emerging countries creates a number of problems such as\nnetwork congestion and poor service delivery for network operators. This results primarily from the lack of a reliable and costeffective\npower solution within such regions. This study presents a comprehensive review of the underlying principles of the\nrenewable energy technology (RET) with the objective of ensuring a reliable and cost-effective energy solution for a sustainable\ndevelopment in the emerging world. The grid-connected hybrid renewable energy system incorporating a power conversion and\nbattery storage unit has been proposed based on the availability, dynamism, and technoeconomic viability of energy resources\nwithin the region. The proposed system�s performance validation applied a simulation model developed in MATLAB, using a\npractical load data for different locations with varying climatic conditions in Nigeria. Results indicate that, apart from being\nenvironmentally friendly, the increase in the overall energy throughput of about 4kWh/$ of the proposed system would not only\nimprove the quality of mobile services, by making the operations of GSM base stations more reliable and cost effective, but also\nbetter the living standards of the host communities....
The powermanagement of ICT systems, that is, data processing (Dp) and telecommunication (Tlc) systems, is becoming a relevant\nproblem in economical terms. Dp systems totalize millions of servers and associated subsystems (processors, monitors, storage\ndevices, etc.) all over the world that need to be electrically powered. Dp systems are also used in the government of Tlc systems,\nwhich, besides requiring Dp electrical power, also require Tlc-specific power, both for mobile networks (with their cell-phone\ntowers and associated subsystems: base stations, subscriber stations, switching nodes, etc.) and for wired networks (with their\nrouters, gateways, switches, etc.). ICT research is thus expected to investigate into methods to reduce Dp- and Tlc-specific power\nconsumption. However, saving power may turn into waste of performance, in other words, into waste of ICT quality of service\n(QoS). This paper investigates the Dp and Tlc power management policies that look at compromises between power saving and\nQoS...
The demands of precise time/phase synchronization have been increasing recently due to the next generation of telecommunication synchronization. This paper studies the issues that are relevant to distributing accurate time/phase over optical transport network (OTN). Each node and link can introduce asymmetry, which affects the adequate time/phase accuracy over the networks. In order to achieve better accuracy, protocol level full timing support is used (e.g., Telecom-Boundary clock). Due to chromatic dispersion, the use of different wavelengths consequently causes fiber link delay asymmetry. The analytical result indicates that it introduces significant time error (i.e., phase offset) within 0.3397?ns/km in C-band or 0.3943?ns/km in L-band depending on the wavelength spacing. With the proposed scheme in this paper, the fiber link delay asymmetry can be compensated relying on the estimated mean fiber link delay by the Telecom-Boundary clock, while the OTN control plane is responsible for processing the fiber link delay asymmetry to determine the asymmetry compensation in the timing chain....
Nowadays, heterogeneous devices are available, for communication of voice, video and data in market; in which video content sharing is facing new challenges like varying display sizes, bandwidth adaptation, compression techniques etc. In this paper, we present concepts for extending H.264/AVC towards scalable video coding (SVC), which enables layered coding schemes to allow the encoding of content into several qualities within a single stream, providing the viewer with the best quality depending on his needs and capabilities. SVC provides graceful degradation with bit rate, power and format adaptation. Moreover, the temporal, spatial and quality scalability to form enhancement layers are described. Due to advances in coding efficiencies scalability in video streaming has increased....
The Internet of Things (IoT) is an emerging\nnetwork paradigm, and realizes the interconnection among\nubiquitous things, along with its corresponding applications\nand services in both Physical-world and Cyber-world. Some\nresearches have been worked on IoT modeling and addressing,\nwhich are mainly based on objects with a unique identifier\n(ID). However, in practical scenarios, there are several\nobjects without any available ID, namely non-ID (i.e.,\nnID) physical objects, including the objects unattached any\nID itself, and the objects attached unreadable or un-trusted\nID. It turns out that the nID physical objects related issues\nbecome noteworthy. In this paper, we focus on the nID physical\nobjects to present a modeling and addressing solution.\nConcretely, (1) nID physical objects are described along with\nthe discussion of applying nID solution; (2) a tree-like code\nstructure (i.e., Tree-Code) is introduced to establish a unified\nmodeling scheme for the nID physical objects according\nto abstracted data elements, and also achieves the compatibility\nwith the ID physical objects considering the ID based\ndata elements; (3) Tree-Code based addressing scheme is presented with dynamic updating considerations. It indicates\nthat the nID physical object modeling and addressing provide\ncomplements to the ID physical objects for ubiquitous interactions\nin the IoT....
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