scholarly journals Modeling and Performance Evaluation of Multi-Class Queuing System with QoS and Priority Constraints

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 500
Author(s):  
Fahad Mazaed Alotaibi ◽  
Israr Ullah ◽  
Shakeel Ahmad
Keyword(s):  
Capacity Planning ◽  
Service Providers ◽  
Blocking Probability ◽  
Lower Class ◽  
Queuing System ◽  
Service Rate ◽  
Connection Admission Control ◽  
System Effect ◽  
Class 1 ◽  
And Performance

Many service providers often categorize their users into multi-classes, depending on their service requirements. Each class has strict quality of service (QoS) demands (e.g., minimum required service rate or transfer time) that must be ensured throughout its service. In some cases, priorities are also assigned in a multi-class user’s environment to ensure that the important class user shall be serviced first. In this paper, we have developed a novel Markov chain based analytical model to investigate and evaluate a multi-class queuing system with a strict QoS requirement and priority constraints. Experimental analysis is conducted for two users classes, i.e., class-1 (may be free/student users) and class-2 (may be paid/research users). Each class requests have strict QoS requirements in terms of the minimum required rate (MRR) that must be ensured throughout its lifetime once the request is admitted into the system. Secondly, class-2 requests have preemption priority over class-1, i.e., if there is no room for newly arriving class-2 requests, then one or more active flows of class-1 can be ejected in order to accommodate high-class requests. Model results are validated through simulation results and performance measures of our interest include blocking probability (BP) of individual classes and the overall system, effect of higher-class jobs on lower-class jobs, and link capacity utilization. The proposed model can be instrumental in developing advanced connection admission control (CAC), efficient resource dimensioning, and capacity planning of the queuing system.

Early Capacity Testing of an Enterprise Service Bus

2013 ◽  
pp. 288-305
Author(s):  
Ken Ueno ◽  
Michiaki Tatsubori
Keyword(s):  
Performance Evaluation ◽  
Capacity Planning ◽  
Service Oriented Architecture ◽  
Service Providers ◽  
System Development ◽  
Resource Assessment ◽  
Enterprise Service Bus ◽  
Hardware Resource ◽  
And Performance ◽  
Set Up

An enterprise service-oriented architecture is typically done with a messaging infrastructure called an Enterprise Service Bus (ESB). An ESB is a bus which delivers messages from service requesters to service providers. Since it sits between the service requesters and providers, it is not appropriate to use any of the existing capacity planning methodologies for servers, such as modeling, to estimate the capacity of an ESB. There are programs that run on an ESB called mediation modules. Their functionalities vary and depend on how people use the ESB. This creates difficulties for capacity planning and performance evaluation. This article proposes a capacity planning methodology and performance evaluation techniques for ESBs, to be used in the early stages of the system development life cycle. The authors actually run the ESB on a real machine while providing a pseudo-environment around it. In order to simplify setting up the environment we provide ultra-light service requestors and service providers for the ESB under test. They show that the proposed mock environment can be set up with practical hardware resources available at the time of hardware resource assessment. Our experimental results showed that the testing results with our mock environment correspond well with the results in the real environment.

scholarly journals A NEW QoS GUARANTEE SLA BASED-SCHEME FOR HANDOFF CALLS IN WIRELESS NETWORKS

2017 ◽  
Vol 25 (1) ◽  
pp. 61-66
Author(s):  
Nguyen Cao Phuong ◽  
Tran Hong Quan ◽  
Sang-Ho Lee ◽  
Jung-Mo Moon
Keyword(s):  
Wireless Networks ◽  
Traffic Control ◽  
Service Providers ◽  
Blocking Probability ◽  
Service Level Agreement ◽  
Packet Delay ◽  
Service Level ◽  
Qos Guarantee ◽  
Handoff Call ◽  
And Performance

The most important thing is guarantee QoS over wireless infrastructures. The efficient of service level agreement (SLA) is becoming increasingly important to both service providers and customers. This paper presents some traffic control schemes for improving QoS, trafficmodel and performance evaluation are described. We are defining a new scheme for improving handoff call performances in wireless networks, a finite queuing scheme for the handoff calls. SLA measurement calculates the packet delay parameter (PD) of handoff calls. The handoff calls will be accepted into queue if their PD will be smaller than the average waiting time of the queue. Important performance measures of the suggested scheme such as the blocking probability of new call and dropping probability of handoff call are described and evaluated.  

Spatial Capacity Planning

2021 ◽  
Author(s):  
Omar Besbes ◽  
Francisco Castro ◽  
Ilan Lobel
Keyword(s):  
Capacity Planning ◽  
Economies Of Scale ◽  
Heavy Traffic ◽  
Supply And Demand ◽  
Wait Times ◽  
Service Rate ◽  
Queueing Model ◽  
Service Firm ◽  
Spatial Environment ◽  
And Performance

We study the relationship between capacity and performance for a service firm with spatial operations, in the sense that requests arrive with origin-destination pairs. An example of such a system is a ride-hailing platform in which each customer arrives in the system with the need to travel from an origin to a destination. We propose a parsimonious representation of a spatial multiserver system through a state-dependent queueing model that captures spatial frictions as well as spatial economies of scale through the service rate. In a classical [Formula: see text] queueing model, the square root safety (SRS) staffing rule is known to balance server utilization and customer wait times. By contrast, we find that the SRS rule does not lead to such a balance in spatial systems. In a spatial environment, pick-up times increase the load in the system; furthermore, they are an endogenous source of extra workload that leads the system to only operate efficiently if there is sufficient imbalance between supply and demand. In heavy traffic, we derive the mapping from load to operating regimes and establish implications on various metrics of interest. In particular, to obtain a balance of utilization and wait times, the service firm should use a higher safety factor, proportional to the offered load to the power of [Formula: see text]. We also discuss implications of these results for general systems.

Early Capacity Testing of an Enterprise Service Bus

2009 ◽  
Vol 6 (4) ◽  
pp. 30-47 ◽  
Author(s):  
Ken Ueno ◽  
Michiaki Tatsubori
Keyword(s):  
Performance Evaluation ◽  
Capacity Planning ◽  
Service Oriented Architecture ◽  
Service Providers ◽  
System Development ◽  
Resource Assessment ◽  
Enterprise Service Bus ◽  
Hardware Resource ◽  
And Performance ◽  
Set Up

An enterprise service-oriented architecture is typically done with a messaging infrastructure called an Enterprise Service Bus (ESB). An ESB is a bus which delivers messages from service requesters to service providers. Since it sits between the service requesters and providers, it is not appropriate to use any of the existing capacity planning methodologies for servers, such as modeling, to estimate the capacity of an ESB. There are programs that run on an ESB called mediation modules. Their functionalities vary and depend on how people use the ESB. This creates difficulties for capacity planning and performance evaluation. This article proposes a capacity planning methodology and performance evaluation techniques for ESBs, to be used in the early stages of the system development life cycle. The authors actually run the ESB on a real machine while providing a pseudo-environment around it. In order to simplify setting up the environment we provide ultra-light service requestors and service providers for the ESB under test. They show that the proposed mock environment can be set up with practical hardware resources available at the time of hardware resource assessment. Our experimental results showed that the testing results with our mock environment correspond well with the results in the real environment.

Pathways ahead for New Zealand hill country farming

2016 ◽  
Vol 78 ◽  
pp. 73-82 ◽  
Author(s):  
F.G. Scrimgeour
Keyword(s):  
New Zealand ◽  
Rural Communities ◽  
New Technologies ◽  
Service Providers ◽  
Farming Systems ◽  
Hill Country ◽  
The Status ◽  
And Performance ◽  
Hill Farming ◽  
The Hill

This paper provides a stocktake of the status of hill country farming in New Zealand and addresses the challenges which will determine its future state and performance. It arises out of the Hill Country Symposium, held in Rotorua, New Zealand, 12-13 April 2016. This paper surveys people, policy, business and change, farming systems for hill country, soil nutrients and the environment, plants for hill country, animals, animal feeding and productivity, and strategies for achieving sustainable outcomes in the hill country. This paper concludes by identifying approaches to: support current and future hill country farmers and service providers, to effectively and efficiently deal with change; link hill farming businesses to effective value chains and new markets to achieve sufficient and stable profitability; reward farmers for the careful management of natural resources on their farm; ensure that new technologies which improve the efficient use of input resources are developed; and strategies to achieve vibrant rural communities which strengthen hill country farming businesses and their service providers. Keywords: farming systems, hill country, people, policy, productivity, profitability, sustainability

Limitation of Erlang B Traffic Model in Elastic Optical Network for Blocking Probability Estimation

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Ujjwal ◽  
Jaisingh Thangaraj
Keyword(s):  
Blocking Probability ◽  
Optical Network ◽  
Constant Load ◽  
Traffic Model ◽  
Service Rate ◽  
Service Provisioning ◽  
Connection Request ◽  
Elastic Optical Network ◽  
Simulation Results ◽  
Single Path

Abstract In this paper, an algorithm for multipath connection provisioning in elastic optical network (EON) has been proposed. Initially, the algorithm prefers the single-path routing for service provisioning. But when single-path routing is not adequate to serve a dynamic connection, the algorithm switches to the connection request fragmentation. Its computation is based on the parameters such as capacity_constant and capacity_allowed to fragment the connection request on disjoint paths. Simulation results clearly state that the proposed algorithm performs well in service provisioning as compared to the traditional single-path routing algorithms and improves the average network throughput. Thereafter, we have investigated the limitation of Erlang B traffic model in EON for calculation of link blocking probability using routing and spectrum assignment (RSA) algorithm. It is verified by the following two ways: (i) effect on the blocking probability in case of constant load and (ii) effect of slot width on the blocking probability. Our simulation results indicate that in EON due to dynamic RSA, blocking probability is not constant in case of proportionate varying of call arrival and service rate giving constant load and blocking probability depends on the number of slots per link, but in Erlang B traffic model blocking probability is always constant in case of constant load and it considers wavelength per link instead of slots per link. This is attributed to the fact that Erlang B traffic model fails to calculate blocking probability accurately in EON. We have computed the carried traffic on 14 nodes, 21-link National Science Foundation Network (NSFNET) topology.

scholarly journals A Comparative Analysis of Co-Production in Public Services

2021 ◽  
Vol 13 (12) ◽  
pp. 6730
Author(s):  
Pwint Kay Khine ◽  
Jianing Mi ◽  
Raza Shahid
Keyword(s):  
Public Administration ◽  
Service Providers ◽  
Research Trends ◽  
Future Research ◽  
Production Studies ◽  
Service Production ◽  
Production Research ◽  
Conceptual Paper ◽  
Structural Impacts ◽  
And Performance

This study investigates current research trends in co-production studies and discusses conceptual approaches. The conceptual paper contains studies on co-production in the field of public administration. This study identifies significant gaps in the field of study by systematically examining 32 co-production research works. The study’s contributions include (1) defining two common characteristics of co-production, (2) classifying three forms of co-production by end-users, and (3) discovering that the aims and performance of co-production are more effective for service providers when the strategy is citizen-centric. Future research should (1) concentrate on the reasons for co-production failures or successes, (2) identify additional barriers to co-production in service production, (3) investigate influences on service providers as well as structural impacts on the co-production process, and (4) provide practical assessments of co-production research.

INFORMATION AND UNCERTAINTY IN A QUEUING SYSTEM

2007 ◽  
Vol 21 (3) ◽  
pp. 361-380 ◽  
Author(s):  
Refael Hassin
Keyword(s):  
Service Quality ◽  
Random Variables ◽  
Random Variable ◽  
Queuing System ◽  
Service Rate ◽  
Single Server ◽  
Profit Function

This article deals with the effect of information and uncertainty on profits in an unobservable single-server queuing system. We consider scenarios in which the service rate, the service quality, or the waiting conditions are random variables that are known to the server but not to the customers. We ask whether the server is motivated to reveal these parameters. We investigate the structure of the profit function and its sensitivity to the variance of the random variable. We consider and compare variations of the model according to whether the server can modify the service price after observing the realization of the random variable.

Mind in eBay, body in Macy’s

2016 ◽  
Vol 10 (4) ◽  
pp. 288-304 ◽  
Author(s):  
Syagnik Banerjee ◽  
Phil Longstreet
Keyword(s):  
Virtual Worlds ◽  
Service Providers ◽  
Mobile Technologies ◽  
Content Type ◽  
Physical Context ◽  
Texting While Driving ◽  
Physical Environments ◽  
Routine Tasks ◽  
Media Reports ◽  
And Performance

Purpose With the ubiquitous diffusion of mobile-enabled internet, individuals are constantly immersed in both virtual and physical environments. While this causes distractions, lower attention spans and disasters such as texting while driving and walking, it also creates synergies and smoother navigational experiences. Technology developers, marketers and policy-makers are both concerned and intrigued to understand how to deploy these mobile technologies so as to optimize their disruptive impact. In this paper, the authors aim to develop a framework of dual consciousness to understand the potential causes and outcomes of individual’s simultaneous presence in physical and virtual worlds. Design/methodology/approach A careful review of past academic literature on behavior, as well as media reports of incidents of disruptions, led the authors to construct a 2 × 2 framework depicting behaviors that indicated high-low consciousness in physical, as well as virtual worlds. Findings In dual environments, individuals either dissociate from one of the environments or integrate both environments. While the former is driven by the multiplicity of irrelevant roles and goals, oblivion of relevant roles, perception of group norms and performance of practiced routine tasks, the latter is driven by strong executive control processes, focused singular goals and usage of the virtual environment to reinforce their physical tasks. The most affected parties are retailers, service providers, digital marketers and social media marketers. Originality/value Most prior research in interactive marketing examine effects of online stimuli on online behavior. This paper identifies the noise created by physical context on clicks as well as the interference created by virtual stimuli on physical purchases and service experiences.

Capacity Planning for Cluster Tools of Wafer Fabrication Plant

2010 ◽  
Vol 450 ◽  
pp. 365-368
Author(s):  
James C. Chen ◽  
Chia Wen Chen ◽  
Kou Huang Chen ◽  
Chien Hsin Lin
Keyword(s):  
Capacity Planning ◽  
Production Costs ◽  
Wafer Fabrication ◽  
Total Production ◽  
Output Rate ◽  
Cluster Tools ◽  
And Performance ◽  
Using Data ◽  
Capital Intensive

Wafer fabrication is a capital intensive industry. A 12-inch wafer fabrication plant needs a typical investment of US$ 3 billion, and the equipment cost constitutes about two-thirds to three-quarters of the total production costs. Therefore, capacity planning is crucial to the investment and performance of wafer fabrication plants. Several formulae are presented to calculate the required number of machines with sequential, parallel, and batch processing characteristics, respectively. An AutoSched AP simulation model using data from real foundry fabrication plants is used in a case study to evaluate the performance of the proposed formulae. Simulation results indicate that the proposed formulae can quickly and accurately calculate the required number of cluster tools leading to the required monthly output rate.

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