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We propose a threshold relaxation and holding time limitation for general telephone calls under trunk reservation control in emergency situations. This TR-HTL method aims to accept more general calls while required emergency calls are still accepted. Computer simulation with a queueing system model of a telephone exchange showed that the threshold relaxation increased the number of accepted general...
Value added services like VoIP, videoconferencing and IPTV need end-to-end Quality of Service (QoS) guarantees in order to work correctly. As the Internet is a collection of Autonomous Systems (AS), most of the time the communication endpoints belong to different ASes, so that all the ASes traversed by the communication must cooperate in order to offer end-to-end guarantees. Yet each AS is usually...
We present a novel ONU architecture for coherent UDWDM-PON with randomly distributed ONU wavelengths. The ONU is built with one or two lasers exhibiting simple limited thermal tunability in a specific optical band, where the wavelengths are managed in a Statistical UDWDM approach. If only one laser is present at the ONU, it serves as both local oscillator for coherent receiver and transmitter in a...
Network virtualization is seen as an enabling technology for the Future Internet. In this context, many Virtual Network Embedding algorithms have been introduced in literature so far. This paper discusses an open source framework for the evaluation of such algorithms. The paper describes features provided by the framework, how to use the framework for evaluating these algorithms, and how to extend...
Provisioning of high rate mobile data services and increased network level capacities in mobile cellular systems require higher received signal levels and improved interference characteristics throughout the cell coverage area. Traditional macrocellular deployments, due to high associated path losses, are only able to provide peak bit rates to users near the base stations. Moreover, the situation...
In this paper, we evaluate and analyze a proposed scheme for collision detection in wireless local area networks (WLANs) by computer simulations and theoretical calculations. The proposed scheme utilizes the medium access control (MAC) procedure of multiple-input multiple-output (MIMO) transmission technology, which has been used to achieve transmission with a high link rate in WLANs in recent years;...
The infinite of clouds Can today's internet support a projected >7Bn people and >50Bn Things on-line? The answer has to be: No! It is physically and economically unable to meet the need functionally and economically, and we therefore have only one viable option: The Cloud ! However, this is not a singular entity, but a plurality of (clouds) rich in types and form providing a far greater degree...
This paper proposes a new type of wireless network named Virtual Single Cell (VSC) network. The VSC network means a small cell net which allows smooth packet transfer to moving terminals as if they stayed in a single cell. Small cells are contiguously deployed over roads, and connected with backhaul using PON (Passive Optical Network) drawing large latency. Each terminal is closed in an LMC (Logical...
Nowadays, both military and civil emergency scenarios demand shared-situation awareness between the front-line elements, in order to maximize the effectiveness of the operations. This requires a communication system based on mechanisms that self-adapt to dynamic conditions and that are able to work under heterogeneous networks. The proposed Cognitive Routable Ad-hoc Network (CRAN) protocol allows...
Elastic Optical Network (EON) is expected as one of future networks in terms of spectrum flexibility. While Routing and Wavelength Assignment (RWA) problem is one of the key issues in traditional Wavelength Division Multiplexing (WDM) networks, Routing and Spectrum Assignment (RSA) problem has much impact on network performance in EONs. On the other hand, Data-Center (DC) traffic and/or mobile back-haul...
In a Passive Optical Network (PON), the possibility of smooth upgrading the network infrastructure is an important requirement for network providers as it allows to minimize initial investments for networks deployment. During the upgrade process, it is expected a coexistence of new and old end-users, i.e., Optical Network Units (ONU), with diverse transceiver technologies. Our work focuses on the...
The paper presents a detailed techno-economic model for LTE networks with inherent coupling of CAPEX and OPEX cost elements. Every resource of the developed cost model defines its contribution to the investment and operation costs, which allows for a detailed tracking and reporting of capital and operation expenditures from single elements to complete network abstraction. The internal structure of...
This paper addresses coexistence scenarios between TWDM and signals with different modulation formats. It was studied the effect of each signal in the performance of TWDM for different wavelength allocation.
Experimental investigations are presented concerning on the use of optical amplifiers in Fiber-to-the-Building/Home (FTTB/H) access networks sharing TV channels for broadcasting DVB-T signals. Both Erbium Doped Fibre Amplifier (EDFA) and Semiconductor Optical Amplifiers (SOA) have been considered and the experimental results show that SOA can induce severe constraints that have to be suitably faced...
We investigate an approach to trust management in a mobile ad-hoc network by first clustering the network in an efficient manner based on the cost of analysis/processing concept, and then using the experience of some nodes to achieve trust information dissemination through the network. This is accomplished by first exchanging trust information between the nodes and the cluster-head when the cluster...
In this paper we introduce the Generalized Virtual Networking (GVN) concept. GVN provides a framework to influence the routing of packets based on service level information that is carried in the packets. It is based on a protocol header inserted between the Network and Transport layers, therefore it can be seen as a layer 3.5 solution. Technically, GVN is proposed as a new transport layer protocol...
Optimum utilisation of the transport links in the access networks as well as satisfaction of the end-user service quality (Quality of Experience — QoE) is important for mobile operators. The necessary prerequisites for proper dimensioning (capacity planning) of the access network are careful modeling of the arrival traffic characteristics and proper QoE to QoS (Quality of Service, e.g., delay) mapping...
The provision of new services based on the interconnection of smart devices into the IPv6-based Internet of Things (IoT) calls for novel technology solutions offering the possibility of automated, unsupervised network configuration and operation. This aspect is especially important for the mobile ad hoc networks (MANETs) as a key enabling technology for the IoT. The mechanisms of Stateless Address...
Due to the improvement of wireless technologies such as LTE and WiMax services, various changes occur around the Internet market. High-speed wireless services become competitors of fixed-line broadband-services. We present the current situation of Internet-access-service market in Japan. We analyzed the change of the preference for the Internet access services from the following two customer segments:...
With the constant increase of traffic volume the energy consumption of telecommunication networks is also increasing. Energy conserving solutions are needed to maintain their sustainability. With access networks being the leading contributor to overall network energy demand, their energy-aware operation is of primary importance. Future access networks are expected to be based on a hybrid wireless-optical...
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