Quality of Service in Next Generation Networks

To guarantee the Quality of Service (QoS) is one of the key objectives of thenext generation network.Based on the introduction of the Next GenerationNetwork(NGN) and the definition of QoS,various aspects of QoS areanalyzed in this article,with emphasis on different approaches and businessmodels.It is noted that QoS concerns the parametric network performanceparameters and the application “satisfaction” level.     

Strategies Towords Next Generation IP Over Optical Networks

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Contextualized User-Centric Multimedia Delivery System for?Next Generation Networks

Telecommunication and Internet services are constantly subject to changes, seeking the customer??s full satisfaction. Enriching these services with innovative approaches such as context-aware, social, mobile, adaptable and interactive mechanisms enable users to experience a variety of personalized services seamlessly across different platforms and technologies. In this sense, Service Oriented Architectures play a central role in allowing component reuse and low cost service creation. Together with IP Multimedia Subsystem enable the convergence of telecommunications and web services, allowing the network transport technologies to be abstracted from the services above. By integrating these technologies, a number of synergies can be explored. Existing services can be easily enriched with context information, made available on a variety of networks and new services can be composed using previously existing building blocks. This paper explains how this integration can be achieved, and demonstrates the potentialities of this architectural paradigm with a prototype service.     

Next Generation Network Service Provision Mode and Its Developing Trend

The provision mode of the telecommunication service has experienced an evolving process, and showing the developing trend from distributed to centralized, from integrated to separated, and from closed to open. To suit this trend, there will be three provision modes as Session Initiation Protocol (SIP) server, Open Service Access (OSA) application server and intelligent network(IN) in Next Generation Network (NGN), provides all kinds of services and applications to the subscribers. With the popularity of broadband access and Internet, the NGN will provide single telecommunication service and act as the important national infrastructure to offer various information services to the subscribers. The service provision mode will be more open, diversified, and individualized.     

A Solution to Optimizing Access Networks

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Public Key Infrastructures — the Next Generation

A public key infrastructure (PKI) is a credential verification scheme based upon public/private key-pair cryptography. This paper explores the PKI story so far and then goes on to identify some of the problems that stand in the way of globalisation and truly successful commercial PKI interworking. Current solutions to these problems are explained, with their respective benefits and limitations, and a much broader picture is evolved to show the likely destiny of the PKI as it begins to become really useful and fit into a wider commercial security context.     

ZTE's Solution to China Next Generation Internet (CNGI)

1 The Birth of IPv6The future communication mode based on the IP protocol is taking shape with the rapid development of the mobile Internet, convergence of voice and data and embedded interconnection equipment. People's lives have experienced great changes by the success of the Internet that has penetrated all aspects of the society. At the same time, the development of the Internet has become an important component of construction of the information-based and modernized society, which brin…     

Next Generation Semantic and Spatial Joint Perception——Neural Metric-Semantic Understanding

Efficient perception of the real world is a long-standing effort of computer vision.Mod?ern visual computing techniques have succeeded in attaching semantic labels to thousands of daily objects and reconstructing dense depth maps of complex scenes.However,simultaneous se?mantic and spatial joint perception,so-called dense 3D semantic mapping,estimating the 3D ge?ometry of a scene and attaching semantic labels to the geometry,remains a challenging problem that,if solved,would make structured vision understanding and editing more widely accessible.Concurrently,progress in computer vision and machine learning has motivated us to pursue the capability of understanding and digitally reconstructing the surrounding world.Neural metric-se?mantic understanding is a new and rapidly emerging field that combines differentiable machine learning techniques with physical knowledge from computer vision,e.g.,the integration of visualinertial simultaneous localization and mapping(SLAM),mesh reconstruction,and semantic un?derstanding.In this paper,we attempt to summarize the recent trends and applications of neural metric-semantic understanding.Starting with an overview of the underlying computer vision and machine learning concepts,we discuss critical aspects of such perception approaches.Specifical?ly,our emphasis is on fully leveraging the joint semantic and 3D information.Later on,many im?portant applications of the perception capability such as novel view synthesis and semantic aug?mented reality(AR)contents manipulation are also presented.Finally,we conclude with a dis?cussion of the technical implications of the technology under a 5G edge computing scenario.     

Requirements on Next Generation Social Networking—A User’s Perspective

When it comes to discussing the future of the Internet, social networking is one of the central buzzwords. The Internet has become a platform where new social networks emerge and the Internet in itself support the more traditional computer supported communication. The way users build and verifies different online networks for communities of people who share interests or individuals who present themselves through user produced content is what makes up the social networking of today. This article discusses general perceived user requirements to the next generation social networks. Particularly, the article presents results of an empirical survey of perceived user requirements to social networks from a group of ICT experts. The survey shows that this group of users has specific requirements to the next generation social networks, and that these can be categorized into high level user requirement dimensions.     

A Distributed Intranet/Web Solution to Integrated Management of Access Networks

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TINA — A Distributed Approach to Service Management

The Telecommunications Information Networking Architecture Consortium (TINA-C) was formed 5 years ago to develop an architecture to address the radical business and technological changes then envisaged in the future telecommunications world. Central to the proposed solution is an infrastructure known as the TINA distributed processing environment (DPE). The TINA service architecture, which defines a set of concepts and rules for the management of a wide range of services, is of particular interest here. This paper outlines the current status and output of the TINA Consortium and goes on to describe a collaborative implementation project which uses many of the TINA concepts and specifications to build a pan-European service platform. An important vision within TINA is that of open interfaces and interoperability in a heterogeneous environment. The extent to which this goal has been achieved is discussed in the light of experience.     

Channel Allocation to Multiservice Wireless Networks: A Collocation—Based Approach to Enhance Spectrum Utilization

A channel allocation (CA) scheme is proposed for wireless networks serving multiple services. The CA scheme is based on collocating the base stations of the wireless networks and restricting their coverage over common cells. The increased coverage granularity makes feasible a more efficient frequency reuse. A genetic algorithm approach is adopted to minimize the number of channels required by the multiservice networks, taking into account the intranetwork and intraservice constraints over a specific coverage area. To validate the proposed scheme and investigate its performance, the Philadelphia benchmark network is employed. Simulation results corresponding to a mix of digital TV and mobile services of various profiles demonstrate the capability of the proposed scheme to optimally allocate channels to multiservice wireless networks.     

Digital GaAs ICs — from supercomputers to comms

It is timely to overview the prospective status of digital GaAs ICs now that judgement has formally been passed on the disposal of the torch-carrier Cray Computer Corp. Symbolic to the end, the Colorado fab is set for RF microwave devices for MIA-COM rather than digital parts for Cray-4s. Digital GaAs has seen a shift to high tele- and data-comms and ATE where the margins over silicon are better marked.     

Efficient Patient Care Through Wireless Body Area Networks—Enhanced Technique for Handling Emergency Situations with Better Quality of Service

Wireless body area networks (WBAN) is a wireless network of sensors placed in and around the human body for monitoring the patient conditions remotely. The goal of WBAN networks is to report the patient condition to the monitoring system with maximum reliability and minimum delay and deliver the life critical data in the emergency situation with utmost priority. The proposed MAC protocol is aimed at delivery of emergency packets with maximum reliability and minimum delay through the introduction of mini slots in the beacon enabled superframe for exclusive transmission of the same. To improve the packet delivery ratio of the normal packets and decrease the energy consumption of the low data rate nodes, a packet rate based scheduled slot allocation is added to this protocol. Extensive simulations show that the proposed protocol is able to achieve nearly 98% packet delivery ratio and less than 100 ms delay for emergency packets. By varying the number of allocated scheduled slots based on the packet rate of the nodes, the proposed protocol has shown improved performance in the packet delivery ratio (93%) of normal packets as compared to IEEE 802.15.6 (85%), also the energy consumption of low data rate nodes has decreased by 64%. The results show that the proposed protocol is successful in realizing much better delay and packet delivery values for emergency and normal packets.     

Generation of Terahertz Radiation from Fe-doped InGaAsP Using 800 nm to 1550 nm Pulsed Laser Excitation

We demonstrate efficient generation of terahertz (THz) frequency radiation by pulsed excitation, at wavelengths between 800 and 1550 nm, of photoconductive (PC) switches fabricated using Fe-doped InGaAsP wafers, grown by metal organic chemical vapor deposition (MOCVD). Compared to our previous studies of Fe-doped InGaAs wafers, Fe:InGaAsP wafers exhibited five times greater dark resistivity to give a value of 10 kΩ cm, and Fe:InGaAsP PC switches produced five times higher THz power emission. The effect of Fe-doping concentration (between 1E16 and 1.5E17 cm^?3) on optical light absorption (between 800 and 1600 nm), on resistivity, and on THz emission is also discussed.     

Molecular beam epitaxy from research to mass-production — Part II

Most physics undergraduates will have encountered the potential well as their first problem in undergraduate quantum mechanics. New crystal growth techniques such as molecular beam epitaxy (MBE) have made it possible to produce quantum wells in practice. This sophisticated technology for the growth of high quality epitaxial layers of compound semiconductor materials on single crystal semiconductor substrates is becoming increasingly important for the development of the semiconductor electronics industry. In the second part of this 2-part feature we get to grips with production by way of two companies, one merchant and the other a captive producer of electronic devices by multiwafer MBE.     

Radio Wave Attenuation due to Clouds from Traditional Models to ML Models—A State of Art

Wireless Personal Communications - The demand for more radio spectrum bandwidths has risen as a result of recent developments in wireless technology from every field of the wireless industry....     

Cooperative MAC Design in Multi-Hop Wireless Networks—Part II: When Source and Destination are Two-Hops Away from Each Other

Ubiquitous and pervasive computing and networking are envisaged as part of the future 5G wireless communication landscape where devices which are multi-hops away from each other are connected in a cooperative way. In this paper, we investigate a challenging case in cooperative communications where source and destination are two-hops away from each other. From the perspective of MAC design, we propose a novel MAC protocol which enables two-hop cooperative communications by involving one or more one-hop neighbors of both source and destination as the relays for cooperative communication. To do so, a concept referred to as Multiple Relay Points (MRPs) has been introduced and the MRPs are selected by jointly considering the link quality of both hops. In addition to employing a static scheme which always uses a fixed number of relays for cooperative communication, we have also proposed an adaptive scheme which can optimally adjust the number of relays flexibly according to channel conditions. Through performance evaluation and comparison with the original IEEE 802.11 based scheme, we demonstrate that more reliable communications, reduced transmission power and significant throughput improvement can be achieved by using our two-hop cooperative MAC protocol, especially when operated in the adaptive mode.