Network Planning (network + planning)

Distribution by Scientific Domains

Selected Abstracts

Successive expansion method of network planning applying symbolic analysis method

The conventional power system network successive expansion planning method is discussed in the context of the new paradigm of competitive electric power, energy and service market. In sequel, the paper presents an application of the conceptually new computer program, based on the symbolic analysis of load flows in power system networks. The network parameters and variables are defined as symbols. The symbolic analyzer which models analytically the power system DC load flows enables the sensitivity analysis of the power system to parameter and variable variations (costs, transfers, injections), a valuable tool for the expansion planning analysis. That virtue could not be found within the conventional approach, relying on compensation methods, precalculated distribution factors, and so on. This novel application sheds some light on the traditional power system network expansion planning method, as well as on its possible application within the system network expansion planning in the new environment assuming the competitive electric power market. [source]

Dimensioning of data networks: a flow-level perspective

Pasi Lassila
Traditional network dimensioning formulations have applied the Erlang model where the connections reserve capacity in the network. Until recently, tractable stochastic network models where the connections share the capacity in the network did not exist. The latter are becoming increasingly important as they can be applied to characterise file transfers in current data networks (e.g. IP networks). In particular, they can be utilised for dimensioning of networks with respect to the file transfer performance. To this end, we consider a model where the traffic consists of elastic flows (i.e. file transfers). Flows arrive randomly and share the network resources resulting in stochastically varying transmission rates for flows. Our contribution is to develop efficient methods for capacity planning to meet the performance requirements expressed in terms of the average transmission rate of flows on a given route, i.e. the per-flow throughput. These methods are validated using ns2 simulations. We discuss also the effects of access rate limitations and how to combine the elastic traffic requirements with those of real-time traffic. Finally, we outline how the methods can be applied in wireless mesh networks. Our results enable a simple characterisation of the order-of-magnitude of the required capacities, which can be utilised as a first step in practical network planning and dimensioning. Copyright 2008 John Wiley & Sons, Ltd. [source]

From rhetoric to reality: including patient voices in supportive cancer care planning

Sara K. Tedford Gold PhD
Abstract Objective, To explore the extent and manner of patient participation in the planning of regional supportive care networks throughout the province of Ontario. We consider the disconnect between the rhetoric and reality of patient involvement in network planning and co-ordination. Context, In 1997, the Province of Ontario, Canada, established a new, regionalized cancer care system. By transferring responsibility to the regional level and to networks, the architects of the new provincial system hoped to broaden participation in decision making and to enhance the responsiveness of decisions to communities. Research approach, Through a qualitative, multiple case study approach we evaluated the processes of involving patients in network development. In-depth, semi-structured interviews and document analysis were complemented by observations of provincial meetings, regional council and network meetings. Results, The network development processes in the three case study regions reveal a significant gap between intentions to involve patients in health planning and their actual involvement. This gap can be explained by: (i) a lack of clear direction regarding networks and patient participation in these networks; (ii) the dominance of regional cancer centres in network planning activities; and, (iii) the emergence of competing provincial priorities. Discussion, These three trends expose the complexity of the notion of public participation and how it is embedded in social and political contexts. The failed attempt at involving patients in health planning efforts is the result of benign neglect of public participation intents and the social and political contexts in which public and patient participation is meant to occur. [source]

A nested benders decomposition approach for telecommunication network planning

Joe Naoum-Sawaya
Abstract Despite its ability to result in more effective network plans, the telecommunication network planning problem with signal-to-interference ratio constraints gained less attention than the power-based one because of its complexity. In this article, we provide an exact solution method for this class of problems that combines combinatorial Benders decomposition, classical Benders decomposition, and valid cuts in a nested way. Combinatorial Benders decomposition is first applied, leading to a binary master problem and a mixed integer subproblem. The subproblem is then decomposed using classical Benders decomposition. The algorithm is enhanced using valid cuts that are generated at the classical Benders subproblem and are added to the combinatorial Benders master problem. The valid cuts proved efficient in reducing the number of times the combinatorial Benders master problem is solved and in reducing the overall computational time. More than 120 instances of the W-CDMA network planning problem ranging from 20 demand points and 10 base stations to 140 demand points and 30 base stations are solved to optimality. 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010 [source]

User-level QoS and traffic engineering for 3G wireless 1xEV-DO systems

Simon C. Borst
Third-generation (3G) wireless systems such as 3G1X, 1xEV-DO, and 1xEV-DV provide support for a variety of high-speed data applications. The success of these services critically relies on the capability to ensure an adequate quality of service (QoS) experience to users at an affordable price. With wireless bandwidth at a premium, traffic engineering and network planning play a vital role in addressing these challenges. We present models and techniques that we have developed for quantifying the QoS perception of 1xEV-DO users generating file transfer protocol (FTP) or Web browsing sessions. We show how user-level QoS measures may be evaluated by means of a Processor-Sharing model that explicitly accounts for the throughput gains from multi-user scheduling. The model provides simple analytical formulas for key performance metrics such as response times, blocking probabilities, and throughput. Analytical models are especially useful for network deployment and in-service tuning purposes due to the intrinsic difficulties associated with simulation-based optimization approaches. 2003 Lucent Technologies Inc. [source]