最新刊期
卷 30 ， 期 6 ， 2014
- 摘要：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.关键词：ultra-low loss fiber;large effective area fiber;space division multiplexing;multicore fiber;few mode fiber1277|2446|0更新时间：2024-06-05
Viewpoint focusing
- 摘要：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.关键词：OSS/BSS;IT service management;fusion1177|1371|0更新时间：2024-06-05
Topic:OSS/BSS and ITSM system
- 摘要：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.关键词：virtual network operator;OSS/BSS;NGOSS;eTOM;SID1034|1192|0更新时间：2024-06-05
- 摘要：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.关键词：BOSS;domain engineering;reusable platform971|1633|0更新时间：2024-06-05
- 摘要：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.关键词：internet;LAMP;cloud platform970|1684|0更新时间：2024-06-05
- 摘要：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.关键词：intelligent network management system;intensive operation;convergence999|1526|0更新时间：2024-06-05
- 摘要：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.关键词：geographic information system;OSS/BSS;platform evolution;future trend933|1567|0更新时间：2024-06-05
Topics:OSS/BSS and ITSM systems
- 摘要：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.关键词：software defined networking;cloud data center network;network architecture;resource utilization;resource management;energy efficiency1031|1427|0更新时间：2024-06-05
Research and development
- 摘要：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.关键词：emergency communication;regional spatial communication;high altitude platform station947|1816|0更新时间：2024-06-05
- 摘要：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.关键词：network selection;user preference;analytic hierarchy process;distance analysis825|918|0更新时间：2024-06-05
- 摘要：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.关键词：multi-user cooperative relay communication;power minimization;joint subcarrier pairing and assignment;resource allocation832|808|0更新时间：2024-06-05
- 摘要：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.关键词：OFDMA;resource allocation;proportional fairness;capacity895|1216|0更新时间：2024-06-05
- 摘要：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.关键词：compatibility calculation;fixed-satellite earth station;space research service earth station;interference;protection distance930|921|0更新时间：2024-06-05
- 摘要：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.关键词：virtual network;network virtualization;minimum cost flow;path splitting;multi-path link embedding753|1122|0更新时间：2024-06-05
- 摘要：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.关键词：high frequency broadband;Gbit/s;multiple-input multiple-output749|1213|0更新时间：2024-06-05
- 摘要：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.关键词：quantum key;trusted relay;trusted control center;trusted quantum relay server767|918|0更新时间：2024-06-05
research and development
- 摘要：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.关键词：certification;evaluation;cloud computing;public cloud;cloud service655|663|0更新时间：2024-06-05
- 摘要：The general requirements for NG-PON2 technology and its overlay configuration based on TWDM PON ＆amp;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.关键词：NG-PON2;TWDM PON;PtP WDM;colorless ONU926|1049|0更新时间：2024-06-05
Overview
- 摘要：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.关键词：inventory management;big data platform;data modeling800|1583|0更新时间：2024-06-05
- 摘要：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.关键词：big data;information value chain;telecom carrier;big data application734|1730|0更新时间：2024-06-05
- 摘要：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.关键词：SDN;network virtualization;network performance;network scalability;network survivability838|1499|0更新时间：2024-06-05
- 摘要：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.关键词：fiber infrastructure;resource management;electronic label;intelligent terminal;fiber to the home719|789|0更新时间：2024-06-05
- 摘要：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.关键词：ROADM;colorless;directionless;contentionless;WSS898|1682|0更新时间：2024-06-05
- 摘要：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.关键词：network management;anomaly prediction;big data;time series analysis1141|2480|0更新时间：2024-06-05
Operating technology wide-angle
- 摘要：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.关键词：data modeling;big data;cloud computing;Hadoop;,telecom817|1481|0更新时间：2024-06-05
computing technology
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