Analytical Model for Paratransit Capacity and Quality-of-Service Analysis

2003 ◽  
Vol 1841 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Liping Fu
Keyword(s):  
Quality Of Service ◽  
Analytical Model ◽  
Travel Demand ◽  
Explanatory Power ◽  
Operating Conditions ◽  
System Capacity ◽  
Fleet Size ◽  
Wide Range ◽  
Transit Capacity

An analytical model could potentially be used by paratransit service planners to predict fleet requirements, system capacity, and quality-of-service measures for specific operating conditions. The model has a sound theoretical origin and was calibrated using data from a large number of simulated cases representing a wide range of operating conditions and quality of service. This model was shown to have a strong explanatory power, capable of capturing the complex relationship between fleet size, travel demand, quality-of-service measures, and other operating condition variables. With this model, analytical procedures similar to those provided in the Highway Capacity Manual and the Transit Capacity and Quality of Service Manual for other transportation facilities and services could be developed for paratransit systems.

scholarly journals Critical Station Practical Capacity on a Bus Rapid Transit Line with Nonstopping Buses

2021 ◽  
pp. 036119812199939
Author(s):  
Jonathan M. Bunker ◽  
Faheema Hisham
Keyword(s):  
Quality Of Service ◽  
High Capacity ◽  
Operating Conditions ◽  
Bus Rapid Transit ◽  
Rapid Transit ◽  
Operational Conditions ◽  
Capacity Model ◽  
Wide Range ◽  
Transit Capacity

Bus rapid transit (BRT) can offer transit mobility to meet growing travel demands by cost-effectively providing high capacity and quality of service. It is adaptable to a wide range of operating conditions and technological advancements. Stations are elements that typically control BRT line capacity, so it is essential to understand the operation of any potentially critical station to understand and manage the facility. The Transit Capacity and Quality of Service Manual (TCQSM) provides the standard methodology for capacity estimation. However, that model does not account for important operational aspects including the stochastic nature of many parameters beyond dwell time, along with nonstopping buses’ capacity, the degrees of saturation of the stopping and nonstopping bus streams, and the upstream average waiting time and queue length of stopping buses. We adapted the theory developed by Hisham et al. for an onstreet bus stop, to reflect the operational conditions of a BRT station and to account for these aspects. This new reliability-based capacity model tailored to BRT facilities provided superior insight into station bus capacity and quality of service to the TCQSM model.

Quality of Service in UMTS Mobile Systems

2010 ◽  
pp. 14-51
Author(s):  
Jahangir Dadkhah Chimeh
Keyword(s):  
Quality Of Service ◽  
Mobile Systems ◽  
System Capacity ◽  
Data Traffic ◽  
Air Interface ◽  
Layer 2 ◽  
Qos Parameters ◽  
Erlang Capacity ◽  
Transport Channels

Mobile systems and particularly UMTS are growing fast. These systems convey data based services in addition to customary voice services. Quality of service is a function of data rate, delay and signal to noise plus interference ratio in these systems. In this Chapter first the author pays attention to UMTS and its QoS architecture, then to service categorization due to QoS. Afterwards he reviews some QoS parameters. Then he studies Layer 2 QoS parameters and general concepts about Transport channels. Then he review TCP effects on the throughput in the air interface. he introduces HSDPA in the next section. Finally he pays attention to data traffic models and their effects on the system capacity and Erlang capacity and delay in the system.

scholarly journals A Lightweight Slice-Based Quality of Service Manager for IoT

IoT ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 49-75
Author(s):  
Antonio Oliveira-Jr ◽  
Kleber Cardoso ◽  
Filipe Sousa ◽  
Waldir Moreira
Keyword(s):  
Quality Of Service ◽  
Industry 4.0 ◽  
Farming Systems ◽  
Smart Manufacturing ◽  
Network Slicing ◽  
Wide Range ◽  
The Internet Of Things ◽  
Service Manager ◽  
Digital Farming

Industry 4.0 and digital farming rely on modern communication and computation technologies such as the Internet of Things (IoT) to provide smart manufacturing and farming systems. Having in mind a scenario with a high number of heterogeneous connected devices, with varying technologies and characteristics, the deployment of Industry 4.0 and digital farming solutions faces innovative challenges in different domains (e.g., communications, security, quality of service). Concepts such as network slicing and Software-Defined Networking (SDN) provide the means for faster, simpler, scalable and flexible solutions in order to serve a wide range of applications with different Quality-of-Service (QoS) requirements. Hence, this paper proposes a lightweight slice-based QoS manager for non-3GPP IoT focusing on different use cases and their varying requirements and characteristics. Our focus in this work is on non-3GPP IoT unlicensed wireless technologies and not specifically the end-to-end network slice perspective as described in 5G standards. We implemented and evaluated different QoS models in distinct scenarios in a real experimental environment in order to illustrate the potential of the proposed solution.

Transit Capacity and Quality of Service Manual, Third Edition

2013 ◽  
Author(s):  
◽  
Parsons Brinckerhoff ◽  
◽  
◽  
◽  
...  
Keyword(s):  
Quality Of Service ◽  
Transit Capacity

Low-Power On-The-Fly Reconfigurable Iterative MIMO Detection and LDPC Decoding Design

2014 ◽  
Vol 496-500 ◽  
pp. 1825-1829 ◽  
Author(s):  
Ehsan Rohani ◽  
Jing Wei Xu ◽  
Gwan Choi ◽  
Mi Lu
Keyword(s):  
Low Power ◽  
High Performance ◽  
Signal To Noise Ratio ◽  
Wireless Systems ◽  
Operating Conditions ◽  
Mimo Detection ◽  
Ldpc Decoding ◽  
Wide Range ◽  
Multiple Input

Manufacturing and operation of wireless systems require a practical solution for achieving low-power and high-performance when using advance communication apparatus such as that using multiple-input and multiple-output (MIMO). Often algorithm solutions achieve very high performance but over only in a narrow range of operating parameters. This paper presents a hardware design of MIMO detection that allows real-time switching between various algorithms and detection effort to achieve high performance over the wide-range of signal to noise ratio (SNR) found in realistic operating conditions. We illustrate a design with over 80% reduction in detection power that satisfies the required quality of service (QoS) in SNRs (Eb/No) as low as 8.7 dB.

Florida Metropolitan Planning Organization Reports on Transit Capacity and Quality of Service: First-Year Evaluation

2003 ◽  
Vol 1841 (1) ◽  
pp. 128-134 ◽  
Author(s):  
Victoria A. Perk ◽  
Chandra Foreman
Keyword(s):  
Quality Of Service ◽  
First Year ◽  
Actual Process ◽  
Transit Systems ◽  
Metropolitan Planning Organizations ◽  
Metropolitan Planning ◽  
Florida Department ◽  
Planning Organizations ◽  
Transit Capacity

As an application of the transit quality-of-service framework presented in the first edition of the Transit Capacity and Quality of Service Manual (TCQSM), the Florida Department of Transportation required all metropolitan planning organizations (MPOs) in the state where fixed-route transit service operates to analyze those services on the basis of the six measures identified in the TCQSM: service frequency, hours of service, service coverage, passenger loading, reliability (on-time performance and headway adherence), and transit versus automobile travel time. A first-year evaluation compiles the analyses provided by the participating MPOs and provides an assessment of the aggregate performance of the transit systems. A larger part of the study focused on the examination of the actual process used by the MPOs and transit systems to evaluate their services. Changes recommended to improve and refine the process for future years are presented, based on the first-time experiences of the MPOs. This evaluation serves as a model for other areas in the country interested in applying the customer-oriented assessment of transit based on the TCQSM.

scholarly journals Model-Based Cloud Service Deployment Optimisation Method For Minimisation of Application Service Operational Cost

2021 ◽  
Author(s):  
Ivana Stupar ◽  
Darko Huljenić
Keyword(s):  
Quality Of Service ◽  
Cloud Service ◽  
Operational Cost ◽  
Cloud Infrastructure ◽  
Application Service ◽  
Cloud Application ◽  
Wide Range ◽  
Service Deployment ◽  
Cloud Applications

Abstract Many of the currently existing solutions for cloud cost optimisation are aimed at cloud infrastructure providers, and they often deal only with specific types of application services, leaving the providers of cloud applications without the suitable cost optimization solution, especially concerning the wide range of different application types. In this paper, we present an approach that aims to provide an optimisation solution for the providers of applications hosted in the cloud environments, applicable at the early phase of a cloud application lifecycle and for a wide range of application services. The focus of this research is development of the method for identifying optimised service deployment option in available cloud environments based on the model of the service and its context, with the aim of minimising the operational cost of the cloud service, while fulfilling the requirements defined by the service level agreement. A cloud application context metamodel is proposed that includes parameters related to both the application service and the cloud infrastructure relevant for the cost and quality of service. By using the proposed optimisation method, the knowledge is gained about the effects that the cloud application context parameters have on the service cost and quality of service, which is then used to determine the optimised service deployment option. The service models are validated using cloud application services deployed in laboratory conditions, and the optimisation method is validated using the simulations based on proposed cloud application context metamodel. The experimental results based on two cloud application services demonstrate the ability of the proposed approach to provide relevant information about the impact of cloud application context parameters on service cost and quality of service, and use this information in the optimisation aimed at reducing service operational cost while preserving the acceptable service quality level. The results indicate the applicability and relevance of the proposed approach for cloud applications in the early service lifecycle phase since application providers can gain useful insights regarding service deployment decision without acquiring extensive datasets for the analysis.

scholarly journals Quality of service performances of video and voice transmission in universal mobile telecommunications system network based on OPNET

2021 ◽  
Vol 10 (6) ◽  
pp. 3202-3210
Author(s):  
Sameer A. S. Lafta ◽  
Mohaned Mahdi Abdulkareem ◽  
Raed Khalid Ibrahim ◽  
Marwah M. Kareem ◽  
Adnan Hussein Ali
Keyword(s):  
Quality Of Service ◽  
Video Transmission ◽  
Mobile Telecommunications ◽  
Voice Transmission ◽  
Wide Range ◽  
Universal Mobile Telecommunications System ◽  
Video And Audio ◽  
Qos Performance ◽  
Umts Networks

The universal mobile telecommunications system (UMTS) has distinct benefits in that it supports a wide range of quality of service (QoS) criteria that users require in order to fulfill their requirements. The transmission of video and audio in real-time applications places a high demand on the cellular network, therefore QoS is a major problem in these applications. The ability to provide QoS in the UMTS backbone network necessitates an active QoS mechanism in order to maintain the necessary level of convenience on UMTS networks. For UMTS networks, investigation models for end-to-end QoS, total transmitted and received data, packet loss, and throughput providing techniques are run and assessed and the simulation results are examined. According to the results, appropriate QoS adaption allows for specific voice and video transmission. Finally, by analyzing existing QoS parameters, the QoS performance of 4G/UMTS networks may be improved.

scholarly journals To the question of the necessity of optimization of business processes of modern enterprises

2019 ◽  
pp. 14-18
Author(s):  
O. N. Kolomyts ◽  
S. A. Miterev ◽  
V. S. Tomashenko
Keyword(s):  
Quality Of Service ◽  
Continuous Improvement ◽  
Process Improvement ◽  
Cycle Time ◽  
Business Processes ◽  
Rapid Development ◽  
Competitive Advantages ◽  
Wide Range ◽  
Automation Tools

The rapid development and change of technologies, growing diversification of business and other factors lead to a decrease in the efficiency of the existing system of business processes of companies, which necessitates its purposeful change, continuous improvement of both management and production activities of the organization, that is, the optimization of business processes. In this connection, the article explains the need to optimize the business processes of modern companies, which helps to identify opportunities to reduce costs, cycle time while improving the quality of service or product quality. Stages of optimization of business processes are allocated; the most often applied ways of optimization of business processes, namely: process improvement or restructuring and automation are considered; it is proved that, using for optimization the software, the organizations can manage processes faster and with fewer errors. Automation tools of business processes to optimize operations for organizations in a wide range of industries, contribute to a more efficient use of available resources and provide a more streamlined platform for employees and their tasks, help to save time, minimize costs, enhance competitive advantages and strengthen its position of competitiveness and to improve the efficiency of any company.

scholarly journals THE INVESTIGATION AND EVALUATION MULTISERVICE NETWORK NGN/IMS FOR MULTIMEDIA TRAFFIC

2020 ◽  
Vol 6 (3) ◽  
pp. 10-13
Author(s):  
Bayram G. Ibrahimov ◽  
◽  
Mehman F. Binnatov ◽  
Yalchin S Isayev ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Quality Of Service ◽  
Communication Networks ◽  
Customer Service ◽  
Network Architecture ◽  
Network Capacity ◽  
Network Efficiency ◽  
Wide Range ◽  
Triple Play

The subject of the study is multiservice communication network using the concept NGN (Next Generation Network) based on the open network architecture IMS (Internet Protocol Multimedia Subsystem), supporting a wide range services. The basis of this architecture is the IMS core, consisting of a set of specialized modules responsible for various functions for customer service. The purpose of the article is to analyze the existing technical capabilities of the IMS multimedia messaging subsystem and perspective solutions for the functioning of the NGN/IMS network efficiency in providing multimedia service. As the efficiency of the system, the capacity NGN/IMS networks is selected using the signaling system and protocols NGN. The capacity NGN/IMS networks during the establishment of a multimedia session was analyzed and the functional architecture of the IMS multimedia messaging subsystem that determine the interaction NGN signaling systems an protocols was explored. Manage the presentation Triple Play services to subscribers and simultaneously modify the media stream within the session allows the protocol for the initialization of the SIP and Diameter sessions, which are the main IMS signaling protocol. One of the important requirements for the IMS subsystem is the maintenance QoS (Quality of Service). A mathematical model for estimating the quality of communication services using a system GI/G/1/N based on the theory diffusion approximation is proposed. The research presented in this paper is very important for the theory queuing systems, since the article proposes a method for investigating multiservice communication networks with non-Poisson incoming flow and effective results are obtained for NGN/IMS networks. On the basis of the model analytical expressions are obtained, which allow evaluating the performance indicators of the Triple Play service. The proposed mathematical model can be used to solve a wide range of practical problems, including the management multiservice traffic in the process its transmission in multiservice telecommunications networks, taking into account the quality of service classes. Thus, studies NGN/IMS network capacity indicators using SIP protocols are relevant.

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