Multiservice Networks Research Articles

Hybrid Model Management of Information Messages in Multiservice Networks

Problems of multiservice network modeling on the basis of hybrid methods - methods of graph theory and queue system are considered in the article. Model NGN!network is presented in the form of exponential Petri net. For calculation of probabilistic and time characteristics of network on the basis of Petri net analytical expression was received. On the basis of this expression calculation of time allocation density of message transfer that depends on special points' allocation of distribution function is executed. The model can be used for the study information processes in multiservice telecommunication networks, in development of new protocols, algorithms and control programs of channel resources in NGN!networks. The use of exponential stochastic models of Petri net will give the opportunity of results use received in analytical form (functions, distribution density) for conducting comparative analysis and researches, more complicated information!telecommunication system by mathematical methods.

Performance Analysis of Circuit Switched Multi-Service Multi-Rate Networks With Alternative Routing

We consider a circuit-switched multiservice network with non-hierarchical alternative routing and trunk reservation. Based on the fundamental concept of overflow priority classification approximation (OPCA), we develop two approximations for the estimation of the blocking probability: OPCA and service-based OPCA. We also apply the classical Erlang fixed-point approximation (EFPA) for the estimation of the blocking probability in the network and propose the more conservative max (EFPA, service-based OPCA) as a reasonably accurate evaluation. We compare the approximations with simulation results and discuss the accuracy of the blocking probabilities for the various traffic classes under different system parameter values such as service rates, bandwidth requirements, number of channels per trunk, maximum allowable number of alternative paths and trunk reservation. We also discuss the robustness of the approximations to the shape of the holding time distribution and their performances under asymmetrical cases. We illustrate that when the approximations are used for network dimensioning, their error is acceptable. We further demonstrate that the approximations can be applied in large networks such as the CORONET.

Call admission control and resource allocation of wireless networks

In the next-generation wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) is a potential key technology. A CAC scheme is proposed for subcarrier allocation in OFDM-based wireless multi-service network. Call connection requests are divided into two classes: (i) narrowband calls and (ii) wideband calls. Traffic is characterised as batch arrival process for both classes of the calls, so that each call may request multiple subcarriers to satisfy its Quality of Service (QoS) requirement. There is a provision of buffer for narrowband calls, whereas the sub-rating scheme is used for wideband calls. The successive over-relaxation method is employed to solve the set of steady-state equations governing the traffic model. Various performance measures such as blocking probability of wide and narrowband calls, overall blocking probability of the calls and bandwidth utilisation are established. The sensitivity analysis has also been carried out to depict the effects of various system parameters on the performance measures.

Queuing models for wireless mesh networks

Abstract In this paper we discuss a proposition of various applications of new queueing models that have been developed within the CARMNET project in nodes of the mesh network. These models allow characteristics of systems that service multi-rate traffic to be determined, e.g., the average queue length or the average waiting time for calls of a given class. The proposed models can be used to design, analyse and optimize multiservice networks

A Bandwidth Allocation Model Provisioning Framework with Autonomic Characteristics

The Bandwidth Allocation Models (MAM, RDM, G-RDM and AllocTC-Sharing) are management alternatives currently available which propose different resource (bandwidth) allocation strategies in multiservice networks. The BAM adoption by a network is typically a management choice and configuration task executed by the network operations and management system setup in a static or nearly static way. This paper proposes and explores the alternative of allowing BAM definition and configuration on a more dynamic way. In effect, one of the basic motivations towards BAM dynamic allocation is the fact that multiservice networks characteristics (traffic load) may change considerably in daily network operation and, as such, some dynamics in BAM allocation should be introduced in order to improve performance. A framework is presented supporting BAM dynamic allocation. The framework adopts an OpenFlow-based software-defined networking (SDN) implementation approach in order to support scalability issues with a centralized controller and management network view. The framework architecture also supports the implementation of some autonomic characteristics which, in brief, look for improving and facilitating the decision-making process involved with BAM provisioning in a multiservice network. A proof of concept is presented evaluating different BAM performance under different traffic loads in order to demonstrate the framework strategy adopted.

Improvement in the Priority Handoff Scheme for Multi-Service Wireless Mobile Networks

Improvement in the Priority Handoff Scheme for Multi-Service Wireless Mobile Networks

A NEW DISTRIBUTED PLATFORM FOR CLIENT-SIDE FUSION OF WEB APPLICATIONS AND NATURAL MODALITIES—A MULTIMODAL WEB PLATFORM

Web-based solutions and interfaces should be easy, more intuitive, and should also adapt to the natural and cognitive information processing and presentation capabilities of humans. Today, human-controlled multimodal systems with multimodal interfaces are possible. They allow for a more natural and more advanced exchange of information between man and machine. The fusion of web-based solutions with natural modalities is therefore an effective solution for users who would like to access services and web content in a more natural way. This article presents a novel multimodal web platform (MWP) that enables flexible migration from traditionally closed and purpose-oriented multimodal systems to the wider scope offered by web applications. The MWP helps to overcome problems of interoperability, compatibility, and integration that usually accompany migrations from standard (task-oriented) applications to web-based solutions and multiservice networks, thus enabling the enrichment of general web-based user interfaces with several advanced natural modalities in order to communicate and exchange information. The MWP is a system in which all modules are embedded within generic network-based architecture. When using it, the fusion of user front ends with new modalities requires as little intervention to the code of the web application as possible. The fusion is implemented within user front ends and retains the web-application code and its functionalities intact.

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.

Tensor model of multiservice network with different classes of traffic service

The tensor model of multi-service network for defining characteristics of quality in traffic service with different classes (QoS) is proposed.

Opportunistic call admission control for wireless broadband cognitive networks

Wireless Broadband Cognitive Networks (WBCN) are new trend to better utilization of spectrum and resources. However, in multiservice WBCN networks, call admission control (CAC) is a challenging point to effectively control different traffic loads and prevent the network from being overloaded and thus provide promised quality of service. In this paper, we propose a CAC framework and formulate it as an optimization problem, where the demands of both WBCN service providers and cognitive subscribers are taken into account. To solve the optimization problem, we developed an opportunistic multivariate CAC algorithm based on a joint optimization of utility, weighted fairness, and greedy revenue algorithms. Extensive simulation results show that, the proposed call admission control framework can meet the expectations of both service providers and subscribers in wireless broadband cognitive networks.

Transmission performance of a 400 Gbit s−1 all-optical orthogonal frequency division multiplexing system

The performance of a 400 Gbit s−1 all-optical orthogonal frequency division multiplexing (AO-OFDM) transmission system is researched with the effects of chromatic dispersion, fiber nonlinearities and amplified spontaneous emission (ASE) noise. The numerical simulation results show that the AO-OFDM system can provide a higher spectral efficiency (SE) and a better sensitivity than a dense wavelength division multiplexing (DWDM) system. The accumulated dispersion tolerance of the system reaches 330 ps nm−1. When transmitted over single-span 80 km single-mode fiber (SMF), AO-OFDM signals have a 1.5 dB power penalty at BER=10−3 due to the fiber Kerr nonlinearities, and the receiver sensitivity of the AO-OFDM system is obviously degraded with increasing incident optical power. In multispan transmission, the interaction of the fiber Kerr nonlinearity with the ASE noise is analyzed. A 1320 km maximum transmission distance is realized at 0 dBm incident optical power. The transmission discount due to the ASE noise and fiber nonlinearities in the AO-OFDM system is calculated. Fiber Kerr nonlinearities impose a greater limitation on the performance of the AO-OFDM system for long-distance transmission. All results clearly indicate the feasibility of AO-OFDM technology for next generation 400 Gbit s−1 fiber communication and multiservice networks.

Mathematical theory of teletraffic and its application to the analysis of multiservice communication of next generation networks

This paper presents a survey of the authors results to discuss the model of a multiservice network with “triple play” (unicast, multicast, and elastic) traffic. The main results are given for the model with multicast traffic. Two service disciplines for multicast traffic are considered in the form of systems with transparent requests. An algorithm for the calculation of the blocking probabilities for models involving both unicast and multicast traffic is proposed. In conclusion, the lines of further research are outlined: the analysis of models of the session initiation protocol (SIP), including design problems to control overloads in SIP server networks, the planning of cross-layer interfaces for orthogonal frequency division multiplexing in mobile networks long term evolution (LTE), and the design of methods for the analysis of the quality factors of the file exchange and streaming in peer-to-peer (P2P) networks.

PSO and ACO Algorithms Applied to Optimization Resource Allocation to Support QoS Requirements in NGN

Next Generation Network (NGN) is the backbone of the overall network architecture based on IP network, supporting different access network technologies. This integrated wireless system will have to handle diverse types of traffics, such as data, voice, and multimedia, etc. NGN will provide advanced services, such as Quality of Service (QoS) guarantees, to users and their applications. In this paper, I have studied a pricing scheme for next generation multiservice networks and formulated the optimal resource allocation in a network/service node, given the QoS requirements of each service class that the network element serves. The non-linear pricing model responds well to changes of the characteristics in the input traffic, pricing parameters and QoS requirements. Furthermore, I proposed two new Particle Swarm Optimization and Ant Colony Optimization algorithms to solve it. Numerical results show that my proposed algorithms are easy and efficient to any number of service classes.

A Cost Based Complete Partitioning Congestion Control Strategy for Multiservice OFDMA Networks

In this paper, a congestion control mechanism is presented for multiservice wireless OFDMA networks. The revenue rate and the user SNR's are used to partition the bandwidth in accordance with a com...

Assessment of Productivity of Management Systems of the Multiservice Networks

This article is devoted to the assessment of different service-oriented architectures and development new web-oriented architecture. The current service-oriented architecture such as SOA, COBRA, MWEB considered in the article, reviewed their main advantages and disadvantages in processing large amounts of data. In the range of article done analysis of the response time of distributed multi-service network for different data streams and proposed a new web-oriented architecture of distributed network management. Proposed architecture allows reducing the search time for applications stream that exceeds the service intensity.

Two-Dimensional Convolution Algorithm for Modelling Multiservice Networks with Overflow Traffic

The present paper proposes a new method for analytical modelling multiservice networks with implemented traffic overflow mechanisms. The basis for the proposed method is a special two-dimensional convolution algorithm that enables determination of the occupancy distribution and the blocking probability in network systems in which traffic streams of individual classes can be serviced by both primary and alternative resources. The algorithm worked out by the authors makes it possible to model systems with any type of traffic offered to primary resources. In order to estimate the accuracy of the proposed method, the analytical results of blocking probabilities in selected networks with traffic overflow have been compared with simulation data.

Technical Issues for IP-Based Telephony in Nigeria

Data transmission in IP-networks, with all its challenges and associated prospects, is today a major milestone in the convergence of information and communication technology (ICT). IP-telephony simply refers to the data transfer that encapsulates data (in forms of audio, data, voice and video) media or traffic so that they are transported over data network via IP network technologies. IP telecommunications defines a wider range of applications, technologies and convergence networking that refers to a multi-service network that allows the integration of data, voice and video solutions onto a converged network infrastructure via the use of hardware, software and open-source apps/protocols (such as H.323, Megaco/H.248 signaling and transport protocols) used to setup, control and manage both data, voice and video sessions. The study selected area is the Federal University of Petroleum Resources Effurun in Delta State, in which the VoIP was implemented and issues in its implementation were discussed. These include: delay, packet loss and jitters. Jitters and Packet loss can be curbed via increase in bandwidth allocation; latency can be minimized but not totally eradicated by constantly upgrading the network equipment in terms of speed. The many benefits of IP communications cannot be over-emphasized as it includes advanced dial tone, rich media streaming, unified messaging, IP contact center etc while providing the advantages such as resilience, economy, flexibility, mobility and productivity for users. Even with its many pending challenges, IP communications continues to proffer advancements in mobile computing, apps to support mobile users and telecommuting apps that provide users the much needed merits with soft-phones, soft agents and VPN services. It is recommended that an organization intending to harness its full potentials should join forums and user-groups that will constantly update them such as Multi-Switch Forum (MSF) – in a bid to help them improve the efficiency and effectiveness of their IP implementation.

Internal Blocking Probability Calculation in Switching Networks with Additional Inter-Stage Links and Mixture of Erlang and Engset Traffic

Abstract In the article a new analytical approximate method for modeling multi-service switching networks with overflow links is proposed. The method can be used for blocking probability calculation in switching networks that are offered multi-service traffic generated by finite and infinite number of sources, i.e., in switching networks with multi-service Engset traffic, in switching networks with multiservice Erlang traffic, as well as in multi-service switching networks with Erlang and Engset traffic. The simulation study performed proves high accuracy of the method proposed and confirms the correctness and validity of all adopted theoretical assumptions.

An Improved Optimization Model of Internet Charging Scheme in Multi Service Networks

An Improved Optimization Model of Internet Charging Scheme in Multi Service Networks

An Improved Optimization Model of Internet Charging Scheme in Multi Service Networks

This article will analyze new improved charging scheme with base price, quality premium and QoS networks involved. Sain and Herpers [5] already attempted to obtain revenue maximization by creating charging scheme of internet. The plan is attempted to solve multi service networks scheme as an optimization model to obtain revenue maximization using our improved model based on Byun and Chatterjee [2] and Sain and Herpers [5]. The results show that improved model can be solved optimally using optimization tool LINGO to achieve better revenue maximization. Better results are obtained in all cases rather than in [5]. The advantage of our new model is that ISP also can set up their base price and quality premium based on ISP preferences. For some cases for getting revenue maximization, we do not offer one service and just utilize some of the services.