Software‐defined networking approach for enhanced evolved packet core network

The evolved packet core (EPC) network is the mobile network standardized by the 3rd Generation Partnership Project and represents the recent evolution of mobile networks providing high‐speed data rates and on‐demand connectivity services. Software‐defined networking (SDN) is recently gaining momentum in network research as a new generation networking technique. An SDN‐based EPC is expected to introduce gains to the EPC control plane architecture in terms of simplified, and perhaps even software‐based, vendor independent infrastructure nodes. In this paper, we propose a novel SDN‐based EPC architecture along with the protocol‐level detailed implementation and provide a mechanism for identifying information fields exchanged between SDN‐EPC entities that maintains correct functionality with minimal impact on the conventional design. Furthermore, we present the first comprehensive network performance evaluation for the SDN‐based EPC versus the conventional EPC and provide a comparative analysis of 2 networks performances identifying potential bottlenecks and performance issues. The evaluation focuses on 2 network control operations, namely, the S1‐handover and registration operations, taking into account several factors, and assessing performance metrics such as end‐to‐end delay (E2ED) for completion of the respective control operation, and EPC nodes utilization figures.     

Real-time comparison of a number of predictive controllers

Many model predictive control (MPC) algorithms have been proposed in the literature depending on the conditionality of the system matrix and the choice of its cost-function. This paper presents the newer MPC schemes such as extended predictive control (EPC) and shifted MPC as well as other well known forms. The control performance of these controllers are compared using two systems that are slow and fast reacting. The closed-loop responses are compared and the differences and similarities are explained on the basis of the structure of the control schemes. Disturbance rejection and the tracking of various setpoint trajectories are performed with good closed-loop results from all the controllers. It was found that the controllers that were specifically designed to reduce the system matrix ill-conditionality such as EPC and generalized predictive control provided better control performance when compared to other MPC methods.     

现代EPC工程项目管理讲座--第四讲:EPC工程总承包创造项目产品过程的管理

论述EPC工程总承包创造项目产品过程与项目管理过程的关系，介绍发达国家EPC工程总承包创造项目产品过程管理的特点，创造项目产品过程之间的衔接和交叉，分析其中的经济增长点。     

松木岛铁路专用线EPC项目的风险分析

结合既有项目实践,对项目实施过程中遇到的各种风险因素进行分析,总结了EPC项目模式下设计、施工等各阶段的风险因素,尝试建立风险清单,为同类项目的风险管理提供借鉴。     

谈海外EPC工程项目的风险控制

以水泥窑余热发电工程项目为例,分析了中国企业海外EPC项目风险的特征和影响因素,介绍了识别风险的方法,提出了中国企业风险控制措施建议,力求把由企业风险造成的损失降至最低程度或将其控制在一定的限度范围。     

谈EPC总承包模式下施工阶段的成本控制

从EPC总承包模式下施工阶段成本控制现实问题入手,界定EPC总承包模式下施工阶段成本控制的控制要点,从而提出加强施工阶段成本控制的对策建议,以促进EPC总承包模式下施工阶段成本控制的有效实施。     

基于EPC离线计费系统的研究

3GPP提出的演进分组核心网(EPC)是一种新的全IP核心网,其计费逻辑体系包括两种机制:离线计费(Offline Charging)和在线计费(On-line Charging)。首先介绍了EPC网络的总体架构,随后具体研究了基于EPC离线计费的系统框架、计费话单触发条件和内容计费的实现策略,最后阐述了离线计费流程。     

IXIA EPC测试解决方案

详细介绍了EPC测试挑战和IXIAEPC测试解决方案。主要测试包括LTE网络测试、UMTS和IMS测试、用真实的用户模型测试性能。     

A FERROELECTRIC BASED PASSIVE RFID TAG FOR UHF (860–960 MHz) BAND

ABSTRACT

For a longer working distance between passive tags and the reader, the ferroelectric based technologies are proposed in UHF (860–960 MHz) band transponder. The small ferroelectric capacitor layout area with a stacked capacitor structure over circuit region and a large dielectric permittivity of 250 to 500 and small 1T1C cell array layout area with simple 2T2C based reference scheme allow small chip size. The low operation voltage of 1.5 V to 2.0 V without high voltage boosting scheme also contribute to small power consumption and low cost.     

EPC总承包项目的优势分析

结合工程项目管理实践,探讨了EPC总承包模式与以往传统模式相比的优势所在。EPC总承包模式将设计与施工、采购3个环节有机结合、积极互动、合理交错,突出设计的龙头作用,充分发挥采购、施工的能动性,便于业主对工程的管理,有助于缩短工期,确保工程建设的顺利进行。