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15 June 2014, Volume 30 Issue 6

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Viewpoint focusing

Novel Optical Fibers for High-Capacity Transmission System

Mingjun Li,Hao Chen

2014, 30(6):  1-15.  doi:10.3969/j.issn.1000-0801.2014.06.001

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Novel optical fibers for increasing capacity for transmission system was discussed.For conventional fibers for long haul transmission,because transmission impairments such as chromatic dispersion,polarization-mode dispersion can be perfectly compensated for by digital signal processing,the only fiber parameters that can be optimized further are fiber attenuation and effective area.System figure of merit for the two parameters was discussed and recent results on ultra-low loss and large effective area fibers were presented.For short reach applications,the current efforts in improving multimode fiber bandwidth were reviewed and new trends in multimode fibers to meet future bandwidth demand were discussed.For next generation fibers,multicore and few mode fibers for space division multiplexing would be focused on,which has the potential to increase the capacity by an order of magnitude.Fiber design considerations were presented and recent progress on multicore and few mode fibers was reviewed.Finally,major challenges in space division multiplexing applications using multicore and few mode fibers were discussed.

Topic:OSS/BSS and ITSM system

Fusion of OSS/BSS and ITSM Systems in ICT Industry

Yashi Wang,Lijuan Min,Yan Zhou

2014, 30(6):  17-23.  doi:10.3969/j.issn.1000-0801.2014.06.002

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As fusion and openness become the trend of ICT industry,an OSS/BSS/ITSM system in a service provider or network operator needs effective integration with external systems and resources as well as among the internal isolated components,to provide better support to the operation.The characteristics of the operation of service providers and network operators were summarized,then,the requirements of the OSS/BSS components integration were analyzed,the integration tasks and the noticeable implementation issues were described,the typical misunderstandings in the ITSM and OSS/BSS fusion were pointed out,and the proper fusion approach and available system architectures were given.

Topics:OSS/BSS and ITSM systems

Operation Support System Requirement of OTT

Pengwu Yu,Lei Zhang

2014, 30(6):  24-28.  doi:10.3969/j.issn.1000-0801.2014.06.003

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Virtual network operators were compared with traditional network operators from different aspects.The key points of virtual network operators building OSS/BSS were discussed.The OTT operation characteristics of virtual network operators were emphasized.Based on TMF's Frameworx,the construction principles of VNO's OSS/BSS were discussed.

Analysis and Discussion of BOSS Construction Processes of Telecom Operators

Xiaojun Xie,Junjun Hu

2014, 30(6):  29-32.  doi:10.3969/j.issn.1000-0801.2014.06.004

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BOSS construction processes of telecom operators and the development processes inside software vendors were analyzed based on the product line engineering framework.It was discussed that how to introduce the domain engineering to optimize and adapt existing processes to strengthen architecture management capability of the telecom operators,helping companies achieve IT strategic goals.

Study of IT Internet Target Architecture and Evolution Strategy of Telecom Enterprise

Man Li,Hongming Qiao,Wensheng Yao

2014, 30(6):  33-37.  doi:10.3969/j.issn.1000-0801.2014.06.005

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The challenge faced by IT of the traditional telecom under the environment of internet was introduced,IT construction experience from the excellent internet company was referenced,and the differences of the business model,service characteristics and IT localization between the traditional telecom enterprises and the internet companies were analyzed.IT target architecture of internet model and evolution strategy of the telecom enterprise were proposed,and the related efforts which were needed for the evolution were analyzed.

Study of Intelligent Network Management System in Intensive Operation

Pingli Zhou,Yanchuan Wang,Zhiming Yang

2014, 30(6):  38-42.  doi:10.3969/j.issn.1000-0801.2014.06.006

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Based on requirements of intensive operation and problems in legacy network management systems,the layered network management system architecture which has five function groups was developed,and then,the evolution modes toward intelligent network management systems were studied.

Application of GIS Technology in OSS/BSS

Zhi Sun,Ling Li,Shizhe Liu

2014, 30(6):  43-47.  doi:10.3969/j.issn.1000-0801.2014.06.007

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GIS technology can be used for all the services about spatial location,to improve the service efficiency and service quality of the OSS/BSS.The GIS technology development trend and OSS/BSS principle were introduced,the various applications of GIS technology in the OSS/BSS were summarized,the problems and evolutions in the GIS platform of telecommunications were analyzed,and GIS future trends forecast was made.

Research and development

Fundamental Theory and Key Technology of Software Defined Cloud Data Center Network

Dan Li,Fangming Liu,Deke Guo,Yuan He,Xiaomeng Huang

2014, 30(6):  48-59.  doi:10.3969/j.issn.1000-0801.2014.06.008

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The main research contents of the national basic research program of China（973 program）“Fundamental Theory and Key Technologies of Software Defined Cloud Data Center Network”was introduced.The challenges of cloud data center network faces currently were pointed out,and the solutions based on software defined networking were proposed.The four research tasks for software defined cloud data center network research were elaborated,namely,architecture of software defined cloud data center network,optimization of cloud data center network resource utilization,resource management of multi-tenant cloud data center network,and coordinated control of cloud data center network energy.

research and development

Research on Regional Spatial Emergency Communication System

Wei He,Renchao Xie,Tao Huang,Renfeng Liu

2014, 30(6):  60-66.  doi:10.3969/j.issn.1000-0801.2014.06.009

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Regional spatial emergency communication system not only has a low delay,large capacity advantages,but also has fast system construction and easy maintenance properties,which has a broad application prospects.The feasibility of regional space emergency communication system was discussed,then the architecture of regional spatial emergency communication system was designed,and the application scenario of regional spatial emergency communication used in power emergency communication was discussed.Finally,the key technical issues based on this system architecture were discussed,which could provide a guideline to study the regional spatial power emergency communication.

Research on Network Selection Algorithm Based on User Preference in Heterogeneous System

Cun Yang,Jihong Zhao,Shuyuan Zhao

2014, 30(6):  67-72.  doi:10.3969/j.issn.1000-0801.2014.06.010

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Most network selection algorithms did not pay more attention to user preference for networks which was based on service requirements.For this circumstance,a new network selection algorithm based on user prefenence was proposed.The algorithm was fully considerd service reqirements,user prefernece and network performance.The AHP algorithm and distance analysis were used to calculate subjective and objective user preference weight respectively for different heterogeneous networks.Then the user preference weight for networks could be obtained dynamically on the basis of user strategy.The performance of each candidate network was counted,based on which the optimum network was selected.Simulation results show that the algorithm performs well in network selection and reduces the number of handoff times as the user moves through the network boundary frequently.

A Resource Allocation Algorithm Based on Subcarrier Pairing in Multi-User Cooperative Relay Communication

Bin Chen,Youming Li,Tao Guo,Peng Lei,Xiaoqing Liu

2014, 30(6):  73-78.  doi:10.3969/j.issn.1000-0801.2014.06.011

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For the power minimization problem in multi-user cooperative relay communications,a resource allocation algorithm based on joint subcarrier pairing and assignment was proposed.Firstly,according to the average channel gain and the target rates of user,the assignment of subcarrier numbers was addressed.Then,in order to choose the subcarrier with best channel condition,a multi-user iterative algorithm for joint subcarrier pairing and assignment was proposed,which could achieve the subcarrier pairing in the cooperative transmissions and virtual pairing in the direct transmission,respectively.Finally,the power allocation was conducted by the water-filling algorithm,so that each user could use the minimum power for transmission.The simulation results indicate that the proposed algorithm can conduct subcarrier pairing and assignment effectively to minimize the total transmission power while meeting the users' target rate requirement.

A Novel Resource Allocation Algorithm for OFDMA System with Proportional Fairness

Yaohui Wu,Youming Li,Pengfei Shao

2014, 30(6):  79-85.  doi:10.3969/j.issn.1000-0801.2014.06.012

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Existing algorithms couldn't balance system capacity and high fairness well,so a multi-user rate adaptive allocation algorithm was proposed to maximize the capacity of OFDMA system under proportional fairness.Improved maximize the minimum（max-min）user rate model was proposed,the current user was allocated the highest efficiency subcarrier according to the channel efficiency control parameter.If some allocated subcarrier's channel gain was lower than the threshold value,which would be reallocated to another user whose channel gain was highest.Power allocation model was converted into expression of water-filling line; every user's power allocation was resolved according to the resolved water-filling line.Simulation results and analysis show that the proposed scheme can achieve higher capacity and perfect fairness in a variety of SNR cases,while requiring slightly less computation.

Research on Protection Distances for Interference Between Earth Stations——Protection Distances for Interference from Fixed-SateIIite Earth Stations to Space Research Earth Stations

Jianxin Li,Wenhan Yang

2014, 30(6):  86-89.  doi:10.3969/j.issn.1000-0801.2014.06.013

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Fixed-satellite service earth stations and space research service earth stations parameters in the 8 400～8 500 MHz band were introduced.Then the interference from fixed-satellite earth stations to space research earth stations was examined and the required separation distances for protection of space research earth stations were calculated.For the protection of space research earth stations,both the non-geostationary-satellite and geostationary-satellite systems using maximum equivalent isotropically radiated power spectral density values allowed per“Radio Regulations”were covered.The result shows that required separation distances in the range from 542 km to 582 km around near-earth space research service earth stations would need to be established in order to meet the protection criteria of the near-earth space research earth station.

Minimum Cost Flow Model and Algorithm of Virtual Network Embedding

Xiaohua Chen,Chunzhi Li,Liangyu Chen,Zhenbing Zeng

2014, 30(6):  90-94.  doi:10.3969/j.issn.1000-0801.2014.06.014

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The dynamic process of network virtualization was studied,and the inversion phenomenon that the revenue did not rely on embedding cost was discovered.Then minimum cost flow model and algorithms of virtual network embedding which fit for creating virtual network online on the large-scale substrate network were proposed.Simulation results reveal that the proposed algorithms can improve virtual network acceptance ratio and system revenue,and significantly reduce the time complexity of multi-path virtual link embedding algorithm which ensures real-time performance of online virtual network embedding.The inversion phenomenon also occurs in the simulation.

Design and Implementation of High Frequency Broadband Gbit/s System Based on MIMO-OFDM

Junyu Peng,Sunzeng Cai,Zhenghang Zhu,Jing Xu,Ting Zhou

2014, 30(6):  95-101.  doi:10.3969/j.issn.1000-0801.2014.06.015

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Spectrum bands below 6 GHz have been crowded currently,but demand for high speed wireless communication in low speed environment is growing.Research and development of high-frequency wireless communication system is an important way to alleviate this problem.System structure for high frequency broadband communication was proposed.Physical layer key algorithm such as synchronization,channel estimation and MIMO detection was described briefly.The high frequency broadband Gbit/s system based on MIMO-OFDM was implemented on FPGA based hardware platform.Bandwidth and data rate of the system was tested in indoor environment.Test result shows that performance of the system conforms to design requirements.

Quantum Key Relay Scheme Based on Trusted Control Center

Shaosheng Jiang,Ruinan Chi,Xiaojun Wen

2014, 30(6):  102-107.  doi:10.3969/j.issn.1000-0801.2014.06.016

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A transmit quantum key relay scheme based on trusted control center and trusted quantum relay server was proposed.The quantum key one-time pad encryption algorithm was used in the design of trusted relay protocol.Upon the establishment of trusted relay network,the trusted control center was used to ensure the credibility and security of access relay,and the user's IP address was hidden in the quantum information data that had been encrypted only for the legal user to decrypt and transmit credible information.The security analysis shows,users who do not connect with the quantum channel can still use the trusted relay network to transmit quantum key securely in a long-distance transmission while attackers can not obtain useful quantum key information from the network.

Overview

Research on the Progress of Certification Regarding on Public Cloud Service

Feng Guo,Wei Li

2014, 30(6):  108-110.  doi:10.3969/j.issn.1000-0801.2014.06.017

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The status quo of public cloud development at a global view was described,a lot effort into researching certification of cloud services in some developed countries were devoted,methodology and indicators for certification of public cloud were put forward,and suggestions related to the practice of certification of public cloud service in China were made.

Research on Development and Application of NG-PON2

Ming Jiang,Chengbin Shen,Jialiang Jin

2014, 30(6):  111-117.  doi:10.3969/j.issn.1000-0801.2014.06.018

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The general requirements for NG-PON2 technology and its overlay configuration based on TWDM PON &point-to-point WDM were introduced briefly.The architecture of NG-PON2 system and mixture of multiple technologies over reused ODN were analyzed.And then the main technical features and key technologies in NG-PON2 system were investigated.Finally,the progress of standardization and eco-system were introduced.

Operating technology wide-angle

Research on Big Data Platform and Key Technologies for Inventory Management of Carriers

TeamofBigDataforInventoryManagement Project,TeamofUserAwareNetworkOperationandMaintenance Project

2014, 30(6):  118-125.  doi:10.3969/j.issn.1000-0801.2014.06.019

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Carriers need to shift from incremental to inventory management.It was presented that big data platform and key technologies played the important roles in inventory management.The proposed technologies could solve the existing problems in current carrier's supporting systems,and better business results were achieved in Shanghai Unicom business practice.

Research on Big Data Strategy of Telecom Carriers Based on Information Value Chain Theory

Chengyi Tao,Xiaomei Ma

2014, 30(6):  126-130.  doi:10.3969/j.issn.1000-0801.2014.06.020

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Starting from the concept and characteristics of big data,the theoretical connection between big data and information value,as well as information chain was discussed.From the perspective of information value chain,a theoretical derivation was made on enterprise' big data strategy and based on that,value-added mechanisms of big data in telecom carrier's operating activities were specially explored.Finally the concrete suggestions to telecom carriers on the following areas of big data:data input terminal,data flow field and data output terminal were given.

Discussion of Evolution of Carrier IP Network to SDN

Xiaoming He,Hui Ji,Dongfeng Mao,Hong Tang

2014, 30(6):  131-137.  doi:10.3969/j.issn.1000-0801.2014.06.021

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Software defined networking（SDN）presents a new network architecture of future network,which is adaptable to the innovation of network technologies and applications and transforming the traditional networks.The issues facing the current service provider networks were described first,and the SDN architecture and key features were introduced.Moreover,the SDN performance,scalability and survivability meeting the carrier-graded requirements were discussed and analyzed.Finally,the SDN applications and practices in the service provider networks were explored.

computing technology

Research on Data Modeling Platform Based on Big Data of Telecom

Leiming Shen,Zhiming Bie

2014, 30(6):  138-141.  doi:10.3969/j.issn.1000-0801.2014.06.022

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The Hadoopdesigner system based on big data of telecom was designed.According to the characteristics of telecom data,the system adopted the data modeling platform which was designed based on the idea of metadata.It also combined with many ideas and theories of the data warehouse modeling.It provided a new method for the treatment of big data of telecom,also it provided the unified,standard,and visual model for different kinds of data,and greatly reduced the difficulty of meeting fleetly different requirments of services by a unified way,improved processing efficiency.

Operating technology wide-angle

Research on Intelligent Optical Fiber Infrastructure Management Technology

Tao Zeng,Chengbin Shen,Ming Jiang

2014, 30(6):  142-147.  doi:10.3969/j.issn.1000-0801.2014.06.023

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Along with the large scale of construction and operation of FTTx network,resource management of fiber infrastructure has become an important appeal point for operators.To meet the demand,internet of things technology was introduced to achieve automatic,intelligent fiber infrastructure management.Intelligent fiber infrastructure management technology based on electronic label,intelligent terminal,network management system,was studied.And then the progress of intelligent optical fiber infrastructure management system industry and standardization were investigated on account of some actual test results.Finally,application mode and development trends of intelligent fiber infrastructure management technology in the operator's network were analyzed.

Configuration and Application of ROADM in Optical Layer Networking

Chunhua Zhao

2014, 30(6):  148-151.  doi:10.3969/j.issn.1000-0801.2014.06.024

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Various kinds of configuration of reconfigurable optical add-drop multiplexer（ROADM）were illustrated.Differences in application between optical cross-connect and electrical cross-connect were compared.The main application of ROADM in carrier's network was presented.The scalability of the structure on CDC based ROADM was analyzed.A future framework of CDC based ROADM was proposed and its application in the optical layer and the electrical layer combined networking was analyzed.

Network Anomaly Prediction Method Based on Big Data

Xu Cao,Ruitong Cao

2014, 30(6):  152-156.  doi:10.3969/j.issn.1000-0801.2014.06.025

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With the development of the network technology and expansion of the network size,the probability of network anomaly is greatly increased,which makes network management face greater challenges.An important task of network management is network anomaly detection in time based on the data got by network management system （NMS）; the performance of network management will be great improved if the network anomaly could be detected before it really happen.A method of network anomaly prediction based on big data was presented,the traditional process act as “first alarm,then solve”was replaced by anomaly prediction process.The result is significant for improving network availability and reliability.