Network Planning Research Papers - Academia.edu (original) (raw)

2025

Virtual Routing and Forwarding (VRF) is a technology that allows multiple instances of IP (Internet Protocol) routing table to co-exist within the same Router at the same time. The routing instances are independent, allowing the same or overlapping IP addresses to be used without conflict. Using VRF technology, users can virtualize a network device from a Layer 3 standpoint of creating different “Virtual Routers” in the same physical device. Internet Service Providers (ISP) often use VRF technology to create separate routing table in a single physical Router which are completely isolated one from the others. This chapter discusses about the configuration of VRF-Lite in GNS3 (Graphical Network Simulator-3) on RIP/v2, EIGRP and OSPF protocols. Hands-On Network Device Virtualization With VRF (Virtual Routing and Forwarding)

2025

El objetivo de nuestro proyecto es mejorar la calidad de cobertura y el congestionamiento de potencia por alto tráfico de datos en el sector del Centro Comercial Durán Outlet, por lo que se propone como solución la construcción de un Nodo... more

2025, Operations Research Letters

We study a two-phase, budget-constrained, network-planning problem with multiple hub types and demand scenarios. In each phase, we install (or move) capacitated hubs on selected buildings. We allocate hubs to realized demands, under technological constraints. We present a greedy algorithm to maximize expected demand covered and computationally study its performance.

2025, Journal of Australian Political Economy

While the 'ground zero'of the Global Financial Crisis has been among the metropoles of financial capitalism, the material grounding of the crisis has been in the urban periphery at the intersection of, land, housing, credit, energy and transport. It has been a suburban crisis, with its faultlines fracturing most prominently across the USA but with major tremors and aftershocks in other heavily suburbanised economies, such as Australia, New Zealand, Canada and the UK. In turn the global financial crisis threatens to reshape suburbia in ...

2025, [Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications

In the last years, several attempts have been made to apply AIP techniques to develop systems assisting the network supervisors in selecting the controls to handle network difficulties. Some of the approaches adopted are based on rule-based expert systems and operative research methods: all these attempts have their advantages and drawbacks. This paper describes an approach based on the integration of symbolic rules and linear program models, based on the Constraint Logic Programming (CLP) paradigm, in order to merge the advantages and overcome the problems. By using this approach, we have developed an experimental decision support system to assist the network supervisors in the selection of the expansive controls (e.g. TAR's, Temporary Alternative Routes) to improve the network performance during serious congestion states. The system is under testing in a simulated environment. 1.

2025, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

A wise network planning becomes the most important phase in determining the network efficiency. In this paper we consider the wireless mesh network (WMN) planning problem where no much work has been done. We propose a new multi-objective optimization model for planning WMNs, where the two conflicting objectives, namely network deployment cost and network channels' interferences, are simultaneously minimized while guaranteeing endusers' full coverage and robust topologies. We also propose a novel performance metric to evaluate the network interference level and a population-based optimization heuristic to solve our model, whereby many WMN planning solutions are provided to the end-planner to choose among. We use realistic-size instances (up to 81) mesh nodes to test our multi-objective optimization model, and discuss the impact of the key parameters on the characteristics of the solutions.

2025

The Fock integral for the TE case is derived from the Green's function solution to the scattering problem of a magnetic line source by a PEC circular cylinder. It is shown that for large distances from the cylinder the Pekeris caret function can be obtained from the Fock integral, which agrees with the UTD (Uniform Theory of Diffraction) result for the TE plane wave scattering solution.

2025, IEEE Journal on Selected Areas in Communications

Congestion control is one of the classic issues in network, various strategies are presented until now and one of the main duties of Transport Control Protocol (TCP) is dealing with this issue. Today, with the advancement of computer networks of wired models to wireless fields, the functions are various protocols of the network are more consistent with these environments. One of the networks is Mobile Ad hoc network (MANET). The current study aimed to used cross-layer interactions and by the collaboration of physical cross-layer and network layer attempts to create an environment on which TCP can work well.

2025

Definition of log types. Definition of market constraints. Average profit obtained by the MCIP models considering several market constraints and price sets. Comparison of MCIP models in terms of the total number of feasible solutions, and the number of feasible solutions and functional evaluations required to obtain the best solution, considering several market restrictions and Price Set 1. Analysis of the variability of the average profit obtained by MC-1, based on five repetions for different termination criteria, two price sets, and Market Set 6. Comparison of TS and MC-1 models in terms of the total number of feasible solutions, and the number of feasible solutions and functional evaluations required to obtain the best solution, considering several market restrictions and Price Set 1. Variability of the average profit obtained by TS and MC-1 models for Market Set 6. Percentage differences in average profit bewteen LP, IP, TS, and MC-1 solutions for different market and price sets. Comparison of LP and IP solutions with respect to the fulfillment of market constraints, volume obtained per product, and profit, for Price Set 1 and all market sets. Comparison of TS and MC-1 solutions with respect to the fulfillment of market constraints, volume obtained per product, and profit, for Price Set 1 and all market sets.

2025, IEEE Access

Long-Range Wide-Area Network (LoRaWAN) enables flexible long-range service communications with low power consumption which is suitable for many IoT applications. The densification of LoRaWAN, which is needed to meet a wide range of IoT networking requirements, poses further challenges. For instance, the deployment of gateways and IoT devices are widely deployed in urban areas, which leads to interference caused by concurrent transmissions on the same channel. In this context, it is crucial to understand aspects such as the coexistence of IoT devices and applications, resource allocation, Media Access Control (MAC) layer, network planning, and mobility support, that directly affect LoRaWAN's performance. We present a systematic review of state-of-the-art works for LoRaWAN optimization solutions for IoT networking operations. We focus on five aspects that directly affect the performance of LoRaWAN. These specific aspects are directly associated with the challenges of densification of LoRaWAN. Based on the literature analysis, we present a taxonomy covering five aspects related to LoRaWAN optimizations for efficient IoT networks. Finally, we identify key research challenges and open issues in LoRaWAN optimizations for IoT networking operations that must be further studied in the future. INDEX TERMS LoRaWAN, IoT, co-existing applications, resource allocation mechanisms, MAC layer protocols enhancements, network planning, mobility support.

2025

The NYNEX Corporation invests hundreds of millions of dollars each year to enhance the telecommunications services provided to its customers. Extensive planning and construction are required to meet the ever-increasing demand for better service and provide the latest in sophisticated equipment throughout the telephone network. Engineering groups plan changes to network facilities five years ahead, with constant adjustments for changes to forecasted service demand, changes in the economy, changes to NYNEX company policies, or the availability of new technologies. ARACHNE is an expert system that automates interoffice facilities (IOF)

2025, Journal of telecommunications and information technology

Implementation of the ITU-R P.1546-4 and ITM propagation models for SEAMCAT prepared and developed in the National Institute of Telecommunications Poland is presented. Results of our research encompasses methodology, implementation and verification of plug-ins into the SEAMCAT software are shown. Keywords—electromagnetic compatibility, interferences, propagation, SEAMCAT, spectrum engineering.

2025, Journal of Economic Theory

This paper endogenizes the borrowing constraints on capital in a production economy with incomplete markets. We find that these limits get looser with income, a property that is consistent with US data on credit limits. The framework with endogenous limits is then used to study the effects of a revenue neutral tax reform that eliminates capital income taxes. Our results illustrate that it is very important to take into account the effects of tax policies on the limits. Throughout the transition, these effects can be big enough to change the overall conclusion about the desirability of a tax reform.

2025, BRAC University Journal

In wireless communication throughput is a key factor to measure the quality of wireless data link. Throughput is defined as the number of information bits received without error per second and we would naturally like this quantity as to be high as possible. This research work looks at the problem of optimizing throughput for a packet based wireless data transmission scheme from a general point of view. The purpose of this work is to show the very nature of throughput and how it can be maximized that means how we can optimize the throughput by observing its certain changing parameter such as transmission rate, packet length, signal-to-noise ratio (SNR) etc. Our main result is a mathematical technique for determining the optimum transmission rate and packet size as a function of the other variables. The key to maximizing the throughput rate is maintaining the signal-to-noise ratio at an optimum level determined by the nature of the channel. Have We tried to take a more a more general look at throughput by considering its definition for a packet-based scheme and how it can be maximized based on the channel model being used. In this research work we have used Rayleigh Fading Channel.

2025, Periodica Polytechnica Electrical Engineering

In the field of network planning, local optimization techniques are frequently applied to improve the topology of the network by determining between which nodes a connection should exist. In many cases, some links can be merged at extra nodes (Steiner points) in order to save some costs. Finding these extra points belongs to the weighted Fermat-Weber-problem. In this paper, a new representation and construction of the solution to the Fermat-problem is proposed. General conditions of the technological applicability are presented. Furthermore, upper bounds are given to the achievable cost saving in advance without the construction of the Steiner points.

2025, Mathematical Programming

In this part, the problem is clearly defined from a practical point of view. A general multi stage mathematical programming formulation of the problem addressing the shortcomings is presented. The complexity issues of this general formulation is also addressed and discussed. Finally, we propose a directed graph, minimum edge cost network flow modeling of the problem for a truly multi stage formulation that would guarantee global optimality. Results form a simple test case based on the proposed formulation is presented and analyzed.

2025

Data centers (DCs) have emerged as a viable and efficient infrastructure for storing data and enabling the launch of diverse network services and applications alongside the proliferation of online applications and data volumes (e.g., cloud computing, video streaming). The underlying infrastructure is frequently burdened with the diverse resource demands (storage, computation power, bandwidth, latency) by these applications and services. The study explores various aspects of data center design, architecture, and the challenges faced by modern data center infrastructures. The paper discusses the evolution from traditional north-south traffic models to more efficient spine-leaf designs, addressing key components that enable the smooth operation of data centers. It highlights emerging trends like sustainability, edge computing, and AIassisted management, which are reshaping the landscape of data centers to meet the growing demands of cloud computing, big data, and IoT applications. Additionally, the study examines significant challenges such as scalability, latency, energy efficiency, security threats, and network management complexities. Through a review of relevant literature, the study provides insights into current advancements in traffic scheduling algorithms, resource allocation techniques, and the integration of emerging technologies. The paper aims to provide a comprehensive understanding of the current state of data center networks, their evolution, and future trends, offering a roadmap for efficient, sustainable, and secure data center operations.

2025, Abdalraof Hams

The mobile operators in Libya, like many other operators, use some propagation models to predict the strength of the signal at the receiver, but without analyzing which model is the best for the Tripoli region. This paper presents a comparison of four radio propagation empirical-type models (COST 231, Okumura, Okumura-Hata, and Ericson 9999) based on LTE technology to be applied at different locations within Tripoli environment. The field measurements analysis shows that the Okumura has the lowest RMSE value, which is being tuned using real data collected from the local environment.

2025, IEEE/ACM Transactions on Networking

2025, 13th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems

This work presents a traffic characterization procedure for Traffic Engineering (TE) in converged networks. An analytical model, focused in a selfsimilar aggregated traffic characterization is proposed, which considers QoS restrictions for delay metrics. The model, together with evolutionary techniques, is used for the optimization of the link capacity assignment task in network planning with multi-service applications. The results show that the traffic characterization model is reliable as a part of the optimization of costs in converged networks.

2025

This paper discusses the seemingly inespacable tension between two dominant approaches to governance that are implemented with regard to the planning, design and development of infrastructure networks, such as roads and railways. Roughly, these approaches can be framed in two styles of governance, the hierarchical and the consensual style (Smits, 1995). In today’s (western) societies, hierarchical approaches to governance seem

2025, Computer Networks

Providing diverse, ubiquitous and cost-effective broadband services is a foremost challenge for the telecommunication community. Fixed WiMAX or IEEE 802.16d is one of the most promising radio access technologies, providing high performance similar to wired xDSL systems, yet superior to that of current 3G mobile technologies. Numerous deployment concepts are foreseen for WiMAX networks. They are designed to cover isolated areas, thus embodying an appealing solution for cellular networks or wireless backhaul for WiFi access. The latter concept is of interest in this paper that puts forward an analytical model based on the economical aspects to dimension hierarchical WiMax-WiFi networks. The proposed model consists in replacing a finite number of nodes by an equivalent continuum. Its key feature lies in accounting for the effect of interference as well as for the physical layer and channel characteristics in an easy and straightforward manner. On the one hand, the model takes into consideration frequency planning and scheduling aspects; and on the other hand, it provides tractable formulae of the end-user mean capacity and coverage probability in order to properly dimension the hybrid network. Last but not least, the economical facet of network planning is considered to unravel the design trade-offs between maximizing the service provider profit and satisfying the end user requirements in terms of performance.

2025

When operating a cellular radio system nearly at full capacity, admitting yet another user may jeopardize the stability of the system as well as the performance of the individual users. Therefore, proper admission control is crucial. The core idea in this work is to predict the relative load of the system, given that a user is admitted. Then, the user will be admitted if the predicted load in the specific cell, and in its neighbors, is below some threshold. This provide an interesting alternative to algorithms based on hard capacity, which might be utilizing the resources inefficiently in order to be robust. The proposed uplink admission control algorithm utilizes measurements readily available in the system. Simulations indicate performance improvements. Furthermore, multi-services are naturally handled, and availability of high data-rate services are automatically limited with respect to coverage, compared to services of lower data-rate.

2025, RMIT B.Eng

EEET Radio Communication System Engineering

2024

Transmission network expansion planning (TNEP) is a basic part of power system planning that its task is to minimize the network construction and operational cost, while meeting imposed technical, economic and reliability constraints. Recently, many methods have been introduced for solution of the static transmission network expansion planning (STNEP) problem. However, in whole of them, the effect of bundle lines on network losses has not been investigated. For this reason, in this paper, STNEP problem is being solved considering the effect of bundle lines on the network losses in a transmission network with different voltage levels using decimal codification genetic algorithm (DCGA). Finally, the effectiveness of proposed idea is tested on an actual transmission network of the Azerbaijan regional electric company, Iran. The results analysis reveals that bundle lines have important effect on the network losses in STNEP problem. Moreover, considering the bundle lines in a power system with various line voltage levels are caused the operational costs is decreased in addition to reduce of the total expansion costs. Thus, the effect of bundle lines on the network losses is caused the total expansion costs (expansion cost of lines and substations) are calculated more exactly and therefore the transmission expansion planning is optimized. K e y w o r d s: STNEP, bundle lines, network losses, investment return, genetic algorithm

2024, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference

In this paper we propose a two-step distributed scheduling algorithm for relay-assisted cellular networks where a given user can be either served by the base station or by a relay, in a opportunistic way. Such a distributed approach allows a reduced feedback signaling with respect to the centralized case, especially when a simple scalar feedback is not sufficient for estimating the channel quality. As a result of the reduced feedback signaling requirements the system becomes more scalable, as new relays can be deployed where required without need of a careful network planning. We study the effectiveness of the proposal by means of a multicell simulator.

2024

In recent years, the need for broadband wireless access, is directly associated with the demand for multimedia services (e.g. video streaming, videoconference or even high speed web browsing), especially inside hot-spot areas. The evolution of "third-generation" (3G) systems seems a very promising answer to the users' demands for enhanced service provision. However the successful deployment of 3G systems is frequently debated these days. Furthermore, the beyond 3G systems or the so called "fourth generation" (4G) systems (i.e. multiple different radio access technologies, collaborating with each other, providing both diverse access alternatives and QoS improvement) attract the interest of both network and service providers. Taking into consideration the above described trends in the area of wireless network systems, the IP-enabled DVB-T (the terrestrial specification of the Digital Video Broadcasting family) networks are considered as an appealing network access alternative. Along this direction, this paper presents the most important points; as far as concerns network planning and performance evaluation, arise from the IP-enabled DVB-T networks utilization, inside beyond 3G systems.

2024

The level of access is an important and practical indicator in measuring the usability of a facility, which
can be used to evaluate the compatibility of what was intended in the design with what is used by
users. In various studies and evaluations, depending on the opinion of the researcher and expert, levels
are usually defined for access in the scope of coverage, which depends on diagnosis and experience.
In this article, the numerical effectiveness of the behavior of applicants to use the services of each
facility at any distance from those limits and the methods of calculating the effective range and the
Three level Access Model (TLAM) are presented. The central coverage in this model is defined in three
access levels around the center, each of which includes 25%, 25%, and 50% of the covered area,
respectively.

2024

A new QoS aware predictive scheduling strategy in EPONs

2024

This paper presents an approach to determine the optimal placement and size of ESSs in a high wind penetration grid. Genetic Algorithm (GA) is used to find optimal placement of ESSs so that the combined generation of wind and ESSs is maximized. A cumulant-based multi-period AC Optimal Power Flow (OPF) model with the incorporation of ESSs is developed to take into account wind and load uncertainties in the sizing of the storage devices. The model is tested on IEEE 57-bus system and on real Sicilian system in Italy.

2024

2024, 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

This paper discusses essential implementation aspects of simple amplify-and-forward type repeaters from the radio network planning point of view. Different RF-repeater configurations are assessed through numerical analysis and field measurements in WCDMA network. The target of this paper is to show some important factors regarding the repeater deployment, which have significant impact on the overall cellular network efficiency. The paper shows the impact of repeater donor antenna beam width on the repeater deployment flexibility. Moreover, the impact of repeater on the optimum BS antenna tilt angle is presented using two macrocellular topologies. Finally, the significance of repeater placement in the repeater antenna line is emphasized through field measurements using an outdoor-toindoor repeater configuration for WCDMA.

2024

The use of real Network topology parameters allows a validation of the optimization software for a real DVB network. A commercial network planning software has been used to perform initially a realistic coverage study. Later this is complemented with the design and use of an optimization software based in Simulated Annealing which returns, after several iterations, the optimum configuration in terms of a cost function. The specific cost function is defined to reduce the interference level.

2024

In this paper, we have introduced an algorithm to implement a sorting network for reversible logic synthesis based on swapping bit strings. The algorithm first constructs a network in terms of n*n Toffoli gates read from left to right. The number of gates in the circuit produced by our algorithm is then reduced by template matching and removing useless gates from the network. We have also compared the efficiency of the proposed method with the existing ones.

2024, 32nd IEEE Conference on Local Computer Networks (LCN 2007)

We consider dimensioning of data networks. The network is modeled in a dynamic setting where elastic flows (file transfers) arrive randomly and share the bandwidth according to balanced fairness. Simple methods are derived for determining the link capacities so that given flow-level throughput requirements are satisfied. We consider two different approaches to define the throughput requirements: single constraint on average throughput in the network and separate constraint for every route. The results enable a simple characterization of the orderof-magnitude of the required capacities, which can be utilized in practical network planning and dimensioning.

2024, 2010 10th International Conference on Hybrid Intelligent Systems

This paper examines the performance of a new Hidden Markov Model (HMM) structure used as the core of an Internet traffic classsifier and compares the results against other models present in the literature. Traffic modeling and classification find importance in many areas such as bandwidth management, traffic analysis, prediction and engineering, network planning, Quality of Service provisioning and anomalous traffic detection. The new HMM structure, which takes into account the packet payload size (PS) and the inter-packet times (IPT) sequences, is obtained by concatenation of a first part which is framed with a HMM profile with another part whose structure is that of a fully-connected HMM. The first part captures the specific properties of the initial protocol packets while the second part captures the statistical properties of the whole sequence present in the flow. Models generated are found to increase the accurate in classifying different traffic classes in the analysed dataset. The average accuracy obtained by the classifier is 62.5% having seen only five packets, 80.0% after examining 13 packets and 95.5% after seeing the unidirectional entire flow.

2024, IEEE Transactions on Power Systems

An approach is proposed to solve multistage distribution network expansion planning problems considering future uncertainties, guiding the planner from production of expansion plans, evaluation of the plans under various future uncertain scenarios, to the selection of the best strategy. A new balanced genetic algorithm (BGA) is introduced that improves the intensification of the solution search procedure by trading-off diversification ability. This facilitates searching for the optimal solution, but also the efficient production of suboptimal solutions for the planner to take into consideration. The features of the BGA allow a multistage planning problem to be solved more efficiently; the BGA can consider a set of expansion plans in an early planning stage in a single run and produce planning strategies required to solve network problems in a later stage along the planning horizon. The overall performance of each plan under different uncertain scenarios is evaluated using a modified data envelopment analysis to assist decisions on which solution to adopt. The approach is applied to a multistage 'greenfield' distribution network expansion problem considering scenarios for the location of future loads. The results clearly show the advantages of the approach over more conventional methods.

2024, 2011 11th Mediterranean Microwave Symposium (MMS)

Current marine wireless communication systems used for monitoring applications based on buoys suffer from lots of weakness. Many research works concern the design and development of new technological applications to improve marine communications. Particularly, a wireless communication system based on WiMAX standard at the 5.8 GHz band (license-exempt band) could be a good candidate. As an initial task, a propagation channel measurement campaign in maritime environments was carried out to investigate the impact of the wireless channel in different situations. This work provides large scale path loss measurements over sea around urban environments. In particular, a radio link between a buoy and a ship at 5.8 GHz is studied. NLOS (Non-Line-Of-Sight) paths are investigated in depth and they are compared to LOS (Line-Of-Sight) paths. The designed measurement system is described and the experimental measurements are shown. An empirical model is obtained using these experimental data and the key wireless channel parameters are analyzed. In addition, the empirical model is compared to the free space and two-ray theoretical models. This investigation is useful, among others, for planning Worldwide Interoperability for Microwave Access (WiMAX) networks offshore around these challenge environments. Propagation channel measurements; Sea; WiMAX; urban environments; I.

2024, ACM SIGCOMM Computer Communication Review

This paper analyzes the causes of packet loss in a 38-node urban multi-hop 802.11b network. The patterns and causes of loss are important in the design of routing and error-correction protocols, as well as in network planning.The paper makes the following observations. The distribution of inter-node loss rates is relatively uniform over the whole range of loss rates; there is no clear threshold separating "in range" and "out of range." Most links have relatively stable loss rates from one second to the next, though a small minority have very bursty losses at that time scale. Signal-to-noise ratio and distance have little predictive value for loss rate. The large number of links with intermediate loss rates is probably due to multi-path fading rather than attenuation or interference.The phenomena discussed here are all well-known. The contributions of this paper are an understanding of their relative importance, of how they interact, and of the implications for MA...

2024

We have developed an agent-based model to optimize green-field network design in an industrial area. We aim to capture some of the deep uncertainties surrounding infrastructure design by modelling it developing specific ant colony optimizations. Hence, we propose a variety of extensions to our existing work, first ideas on how to realize them and three cases to explicate our ideas. One case is the design of a CO2 pipeline network in Rotterdam industrial area. First simulation results have shown the relevance of the approach.

2024, Transportation Research Part C: Emerging Technologies

We study the freight forwarder's shipment planning problem in an airfreight forwarding network where a set of cargo shipments have to be transported to given destinations. We provide mixed integer programming formulations that use piecewise-linear cargo rates and account for volume and weight constraints, flight departure/arrival times, as well as shipment-ready times. After exploring the solution of such models using CPLEX, we devise two solution methodologies to handle large problem sizes. The first is based on Lagrangian relaxation, where the problems decompose into a set of knapsack problems and a set of network flow problems. The second is a local branching heuristic that combines branching ideas and local search. The two approaches show promising results in providing good quality heuristic solutions within reasonable computational times, for difficult and large shipment consolidation problems.

2024, IEEE Transactions on Consumer Electronics

In this paper, several options to achieve full mobility features and seamless handoff for mobile terminals operating over Bluetooth based wireless personal area networks are proposed and evaluated. Focusing on seamless handoff provision for real-time services, proposals have been oriented to soft handoff implementations. Evaluation has been made in terms of new call blocking and handoff call dropping probabilities, grade of service and overall utilization. A number of design enhancements are incorporated over the basic procedures to minimize the effects of conservative resource reservations associated to mobile terminals in soft handoff and to improve the overall throughput. 1

2024

This paper presents in simple terms some models for reliability studies that become useful even in the absence of reliability data or when these data are scarce or lack confidence. In some cases, it is shown that the best decisions are independent of the reliability data values. In other cases, a risk analysis approach is recommended and the contribution of interval analysis and fuzzy set theory is highlighted.

2024, Proceedings of the 7th International Conference on Cognitive Radio Oriented Wireless Networks

An RF measurement system with high time resolution is implemented to determine the statistical characteristics of various channels in the Land Mobile Radio bands. The applicability of simple statistical models to the observed data is investigated, as well as their validity over short and long periods of time. The results show that the statistics of the idle and holding times of communication on these channels vary significantly over time and demonstrate daily periodicity, requiring non-stationary models to accurately represent them. Over short durations of time however, conventional distributions such as the exponential and log-normal may adequately characterize the properties of these quantities, allowing convenient and compact representations of the data. Results based on empirical data are presented to quantify the probability of stationarity for voice traffic within a time span of given length. The findings are useful for network planning or streamlining, network simulation and modeling, and investigation of dynamic spectrum access.

2024, Sensors

In an underwater acoustic channel, the propagation conditions are known to vary in time, causing the deviation of the received signal strength from the nominal value predicted by a deterministic propagation model. To facilitate a large-scale system design in such conditions (e.g., power allocation), we have developed a statistical propagation model in which the transmission loss is treated as a random variable. By applying repetitive computation to the acoustic field, using ray tracing for a set of varying environmental conditions (surface height, wave activity, small node displacements around nominal locations, etc.), an ensemble of transmission losses is compiled and later used to infer the statistical model parameters. A reasonable agreement is found with log-normal distribution, whose mean obeys a log-distance increases, and whose variance appears to be constant for a certain range of inter-node distances in a given deployment location. The statistical model is deemed useful for higher-level system planning, where simulation is needed to assess the performance of candidate network protocols under various resource allocation policies, i.e., to determine the transmit power and bandwidth allocation necessary to achieve a desired level of performance (connectivity, throughput, reliability, etc.).

2024, Journal of Network and Systems Management

In this paper we describe a network modelingapproach intended to assist in the performancemanagement, design, and optimization of broadbandtraffic networks. Switch and source models, as well asrouting optimization and decision support algorithmshave been integrated in a prototype software tool,called DATANMOT (Data Network Modeling and OptimizationTool). The switch models developed are based on standard Frame Relay and ATM switch implementations.Specifically, an

2024, Networks

In this paper, we consider a problem in networks with storage servers for providing multimedia service. The design involves assigning communication link capacity, sizing the multimedia servers, and distributing different types of content at each server, while guaranteeing an upper limit on the individual end‐to‐end blocking probability. We consider alternative methods for obtaining the end‐to‐end blocking probability with low computation time and present optimization procedures to obtain an optimal solution. Under a linear cost structure, our numerical investigations consider different scenarios that might be helpful in understanding how to distribute multimedia content for a cost‐optimized solution. © 2001 John Wiley & Sons, Inc.