电力线通信标准化探讨

近年来,随着国际上电力线载波通信技术的快速发展,国内很多厂商纷纷推出了各自的电力线通信产品,然而由于没有统一的行业标准,造成这些产品之间互不兼容,因此建立中国的电力线通信行业标准显得尤为迫切。本文首先简单介绍了中国应用电力线高速通信技术的概况,然后充分了国际上电力线通信标准的情况,主要对北美的HomePlug行业组织和欧洲ETSI标准组织在这方面的工作进行了分析。最后给出了中国在电力线通信标准方面需要开展哪些工作的建议。     

VSAT standards,status and applications in europe

This paper is an attempt to present the current status of VSAT systems in Europe, based on two aspects. 1. The first part describes the actions conducted by the European Telecommunications Standards Institute (ETSI) for issuing proper technical standards. It is also explained how these standards are included in the general framework of the European legislation, the purpose of which is to create the conditions for a really open telecommunications market all over Europe, and more particularly to favour the implementation of independent (private) satellite communications networks, mainly for corporate services on a free competition basis, both as concerns operators and manufacturers. 2. The second part gives an overview of the actual implementation of VSAT networks in Europe and of the expected market trends.     

边缘计算标准化进展与案例分析

边缘计算(edge computing, EC)是在靠近人、物或数据源头的网络边缘侧,融合网络、计算、存储、应用核心能力的新网络架构和开放平台.边缘计算将传统的集中式云计算处理的方式,改为将计算存储能力下移至网络边缘,面向用户和终端的方式,就近提供边缘智能服务.边缘计算极大地降低了由于数据回传造成的核心网和传输网的拥塞与负担,实现较低时延,带来较高带宽,同时能够快速响应用户请求并提升服务质量.当前,边缘计算已经成为未来第五代通信(5G)时代的重要使能技术,并写入第三代合作伙伴计划(3rd generation partnership project, 3GPP)标准.越来越多的运营商、设备商、芯片厂商加入建设边缘计算生态的行列,如何打造一个统一的标准化的边缘计算平台对于未来边缘生态的建设至关重要.因此,重点介绍当前边缘计算标准化的进展情况,从欧洲电信标准化协会(European Telecommunications Standards Institute, ETSI)最先提出边缘计算架构开始,到3GPP将边缘计算纳入未来5G发展的关键技术,再到中国通信标准化协会(China Communications Standards Association, CCSA)中边缘计算的立项与课题研究.每一部分的介绍均安排了大量对标准内容的分析和解释.最后介绍了近年来中国联通在边缘计算方面的研究成果.包括重要的边缘计算试点、联通未来边缘计算试点计划以及边缘计算的组网部署方案探索等内容.期望与产业界共同探讨边缘计算商业合作模式,共建网络边缘生态,全面推动5G业务的蓬勃发展.     

分布式语音识别的相关标准及主要技术

分布式语音识别(DSR)是近年来出现的新技术,具有广阔的应用前景。结合ETSI关于DSR的最新标准介绍了DSR系统的组成,分析了DSR的主要技术,如前端特征提取算法、特征压缩与纠检错、服务器端的语音重构算法等,最后对DSR技术的应用做了简单展望。     

vBRAS在城域网中的实践与研究

BRAS作为城域网综合业务接入控制设备,承载了宽带、IPTV、ITMS等多种业务,而vBRAS是城域网虚似化的典型应用。笔者分析了传统BRAS的弊端,结合网络发展趋势,介绍了vBRAS在城域网中的部署应用,探讨了关键技术及主要业务实现方式。软硬件解耦、转控分离是vBRAS的发展方向。网络演进应以提高用户感知、提升业务能力和运维管理智能化为目标,稳步推进新技术的试点应用。     

SDN/NFV发展中的关键:编排器的发展与挑战

网络功能虚拟化(NFV)和软件定义网络(SDN)已被业界普遍认定为下一代电信网络发展的主要方向,编排器作为未来网络的“大脑”,成为运营商灵活管理网络、最大化发挥新技术优势的关键.首先阐述了编排器在下一代网络中的核心地位,并对编排器的技术架构进行介绍.而后从标准化和开源的角度对编排器产业发展情况进行介绍和分析.最后阐述了编排器产业发展中标准与开源的关系,编排器与网管运营支撑系统(OSS)的融合、编排器对SDN的支持以及依托编排器实现网络自动化智能化运营的理念.     

ETSI EN 301893 V2.1.1中自适应测试方法及要点

介绍了ETSI EN 301893 V2.1.1:2017中的新增自适应测试参数,该测试是5G WiFi测试中的一个难点。通过对测试中遇到的常见问题及测试结果分析,指出了测试中需要注意的测试环境搭建细节。     

Enabling autonomicity in wireless mesh networks with the ETSI AFI GANA reference model

The distributed nature of wireless mesh networks (WMNs) allows them to benefit from multiple autonomic functionalities. However, the existing landscape of self‐x solutions (eg, self‐configuration) is fragmented and the lack of a standardized framework through which interoperable autonomics can be developed has been hampering adoption and deployment of autonomics in real‐world service networks. There is a need for a standardized architectural framework that enables to comprehensively support and integrate interoperable components for autonomicity in WMNs. Such an architecture (autonomicity‐enabled wireless mesh architecture) is currently being standardized by the working group called Evolution of Management towards Autonomic Future Internet (AFI) in the European Telecommunications Standards Institute within the Network Technologies Technical Committee. The proposed autonomic wireless mesh architecture is an instantiation of the AFI GANA (Generic Autonomic Network Architecture) reference model, a standards‐based approach to autonomics. This paper complements and extends the early version of the architecture by further detailing the architectural principles and providing experimental and validation results. First, we provide a brief overview of the AFI GANA reference model and then show how each of its building blocks can be instantiated for WMNs. We evaluate the proposed architecture by implementing and testing the 4 basic self‐x functionalities defined by the GANA model. The provided guidelines can now help researchers and engineers build autonomicity‐enabled WMNs using a standardized framework that enables adoption and deployment of autonomics by industry, thereby enabling researchers and engineers to contribute to the further evolution of the standard in the European Telecommunications Standards Institute.     

MPEG - 2 TS码流"健康检查"仪的研究与设计

在深入研究ISO/IEC 13818-1以及ISO/IEC 13818-4的基础上,并参考ESTI TR 101 290的规定,设计出在线实时检测MPEG-2 TS码流状态的"健康检查"(Health Check)仪.本文对设计"健康检查"仪的产业背景,"健康检查"仪的设计思路和方法都做了全面的论述,并以PCR精度检测为实例介绍设计的流程.     

动态频率选择测试要求与解决方案

首先介绍了5 GHz频段无线通信设备的动态频率选择（DFS）技术,然后根据北美和欧洲的相关标准和规范,深入分析了DFS的测试要求,并提出了DFS测试的系统解决方案,最后阐述了DFS的测试现状。