Bandwidth allocation is a fundamental problem in communication networks. With current network moving towards the Future Internet model, the problem is further intensified as network traffic demanding far from exceeds network bandwidth capability. Maintaining a certain user satisfaction degree therefore becomes a challenge research topic. In this paper, we deal with the problem by proposing BASMIN, a novel bandwidth allocation scheme that aims to maximize network user's happiness. We also defined a new metric for evaluating network user satisfaction degree: network worth. A three-step evaluation process is then conducted to compare BASMIN efficiency with other three popular bandwidth allocation schemes. Throughout the tests, we experienced BASMIN's advantages over the others; we even found out that one of the most widely used bandwidth allocation schemes, in fact, is not effective at all.
A Novel Service Deployment Policy in Fog Computing Considering The Degree of Availability and Fog Landscape Utilization Using Multiobjective Evolutionary Algorithms
Measurement and Analysis of Quality of Service of Mobile Networks in Afghanistan End User Perspective
增强的服务质量(QoS)和移动电话用户的满意度是服务提供商的主要关注点。为了有效地管理网络并提供增强的端到端体验质量(Quality of Experience,QoE),运营商需要从不同的角度和网络的不同相关点来测量和分析QoS。本文的范围是从最终用户的角度在阿富汗的移动网络的QoS的测量和统计分析。该研究基于从五家手机运营商的1,515名手机用户中随机收集的原始数据。本文还提出了适当的技术解决方案,移动运营商,以解决现有的挑战,在该地区的QoS和保持市场竞争力。基于处理数据的结果,考虑到地理位置,人口和政府的电信法规,作者建议部署小型小区(SC),增加定期性能测试的数量,优化基站的位置,增加载波的数量,以及高阶扇区化作为建议的技术解决方案。
A QoS Guarantee Strategy for Multimedia Conferencing based on Bayesian Networks
面向服务的体系结构(SOA)通常用于Web服务系统的设计和实现。在SOA环境中实现媒体通信的关键技术是面向服务的通信。为了充分利用SOA的优势,我们设计并实现了一个基于Web的多媒体会议系统,为用户提供了一个混合编排的Web和通信服务。由于目前的SOA缺乏有效的多媒体服务QoS保证解决方案,用户满意度受到QoS违规的极大挑战,例如,低视频PSNR(峰值信噪比)和长播放延迟。为了解决这一关键问题,我们首先采用了业务流程执行语言(Business Process Execution Language,简称BPEL)服务引擎来实现混合服务的编排和执行。其次,我们提出了一种新的上下文感知的方法来量化和利用QoS指标和可用的上下文之间的因果关系的基础上贝叶斯网络(CABIN)。该方法包括三个阶段:(1)信息离散化,(2)因果关系分析,(3)最佳上下文调整。我们实现CABIN在现实生活中的多媒体会议系统,并比较其性能与现有的延迟和吞吐量为导向的计划。实验结果表明,CABIN在提高视频质量方面优于竞争方法的PSNR。它还提供了一个一站式商店控制网络和通信服务。